U.S. patent application number 17/330700 was filed with the patent office on 2021-12-02 for table.
The applicant listed for this patent is Fumio Sudoh. Invention is credited to Fumio Sudoh.
Application Number | 20210368974 17/330700 |
Document ID | / |
Family ID | 1000005667055 |
Filed Date | 2021-12-02 |
United States Patent
Application |
20210368974 |
Kind Code |
A1 |
Sudoh; Fumio |
December 2, 2021 |
TABLE
Abstract
Each of a plurality of leg units (U1 to U4) for supporting a top
plate (2) have a support column (5) and a foot section (6). The
plurality of leg units (U1 to U4) are divided into a first leg unit
group (G1) along one long side edge "a" of the top plate (2) and a
second leg unit group (G2) along the other long side edge "a". The
first operation units (301) corresponding to the first leg unit
group (G1) and the second operation units (302) corresponding to
the second leg unit group (G2) are operated individually, to change
the lengths of the support columns (5) belonging to the leg unit
set (G1) and the second leg unit set (G2) to the different lengths,
so that the top plate (2) is tilted.
Inventors: |
Sudoh; Fumio; (Tokyo,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Sudoh; Fumio |
Tokyo |
|
JP |
|
|
Family ID: |
1000005667055 |
Appl. No.: |
17/330700 |
Filed: |
May 26, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A47B 9/16 20130101; A47B
9/20 20130101 |
International
Class: |
A47B 9/20 20060101
A47B009/20; A47B 9/16 20060101 A47B009/16 |
Foreign Application Data
Date |
Code |
Application Number |
May 27, 2020 |
JP |
2020-092787 |
Claims
1. A table provided with a top plate, a plurality of leg units and
a plurality of operation units, said each leg unit has a support
column and a foot section, said support column has upper and lower
ends, the length of the direction connecting the upper and lower
ends being changeable, and the upper end being connected to the top
plate, and said foot section is connected to said lower end of said
support column and is adapted for seating on the floor, said
lengths of said support columns of said plurality of leg units are
changeable by operating one or more said operation units, wherein
said each leg unit belongs to either a first leg unit group which
includes one or more leg units and arranged on one side of the top
plate or a second leg unit group which includes one or more leg
unit and arranged on the other side of the top plate, said each
operation unit comprises a first operating section for changing the
lengths of the support columns of the leg units belonging to the
first leg unit group, and a second operating section for changing
the lengths of the support columns of the leg units belonging to
the second leg unit group, the second operating section being
operable independently of the first operating section.
2. A lifting table according to claim 1, in each of said leg units,
said foot section comprises a foot body portion which is mounted on
said support column and extends in a direction between said one
side of the top plate and the other side, and plurality of foot
portions which are spaced in the direction of their extension and
are adapted for seating on the floor.
3. A lifting table according to claim 2, the foot body portion of
said leg unit is fixedly mounted on said support column, the foot
portions are mounted on said foot body portion in a manner that the
length of each foot portion protruding relative to the foot body
portion in the direction to the floor can be changed, said
protruding lengths of said foot portions relative to the foot body
portion can be changed corresponding to the tilt angle of the top
plate.
4. A lifting table according to claim 2, the foot body portion of
said leg unit is mounted on said lower end of the said support
column in a manner that the mounting angle can be changed, the
mounting angle of the foot body portion relative to said support
column can be changed corresponding to the tilt angle of the top
plate.
5. A lifting table according to claim 1, both the first and second
leg unit groups have more than two leg units, the support columns
of the leg units belonging to the first leg unit group are in a
common first support column configuration plane, the support
columns of the leg units belonging to the second leg unit group are
in a common second support column placement plane, said first
configuration surface and second configuration surface are parallel
to each other.
6. A lifting table according to claim 1, said foot portions mounted
on the support columns of the leg unit belonging to the first leg
unit group and said foot portions mounted on the support columns of
the leg unit belonging to the second leg unit group are connected
by the connecting member so that the relative position changes of
the both said foot portions resulting from the inclination of said
top plate can be absorbed.
7. A listing table according to claim 1, said leg units includes
four leg units, each arranged at point corresponding to the four
vertices of the parallelogram, said one side and said other side of
the top plate are the two opposite sets of sides of said
parallelogram, with respect to each of the two sets of sides of the
top plate, said foot units are defined as belonging to either a
first leg unit group or a second leg unit group, and two operating
sections are defined as belonging to either a first operating
section or a second operating section.
8. A lifting table according to claim 7, said each leg unit
includes a top plate support structure that is mounted on the top
plate and the upper end of the support column, for connecting the
upper end of the strut to the top plate, in each of said leg units,
one of the operating sections belonging to said first operating
section and one of the operating sections belonging to second
operating section extends into said top plate support structure,
and the length of the support column can be changed by operating
either of said two operating sections.
9. A lifting table according to claim 1, the foot sections are
rotatably mounted on said support columns according to the selected
tilt direction so that the direction in which said foot body
portion extends follows said tilt direction.
10. A lifting table according to claim 1, the height of the top
plate can be changed by changing the support column lengths of the
leg units belonging to the first and second leg unit groups to the
same length.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority from Japan Patent
Application No. 2020-92787, filed May 27, 2020, the entire contents
of which are herein incorporated by reference.
FIELD OF TECHNOLOGY
[0002] This invention concerns a table, which includes a top plate,
several support columns which support the top plate and can change
its height by operation, and foot sections, each of which is
attached to the lower end of the support columns, and can support
said support columns at ground level.
BACKGROUND TECHNOLOGY
[0003] Conventionally, the structure of such devices as office
tables, furniture, setting tables, and working platforms
(hereinafter defined as "tables" in this specification as a general
term) included a top plate for setting items on its top surface or
performing various operations, and one or more support columns to
support the top plate. A solution with a height adjustment device
for changing the height of the top plate is proposed.
[0004] A chair for one person, or a lifting platform for small item
display has a narrow top plate area, and only one s support column
is usually used to support the seat of the chair and top plate of
the table, and an air spring (also known as a "cylinder piston") is
equipped on the support columns. In such devices, a lifting device
is proposed for changing and adjusting the height of the seat and
top plate by manipulating the length of the support columns. In
this lifting device, the support columns is a cylindrical outer
column and an inner column that can be loosely inserted inside it.
Each end of the air spring is fixed to the inner and outer columns
respectively, and the inner and outer columns are guided in the
telescopic direction by the nesting of the protrusions and grooves.
Both the inner and outer columns are relatively non-rotatable, and
the top plate is prevented from rotating with respect the column.
The expansion and contraction of the air spring makes it possible
to adjust the height of the top plate.
[0005] On the other hand, in the case of a table with a
corresponding top plate area, a plurality of s support columns with
at least two or more air springs should be mounted on the left or
right side of the top plate in general (cf. Patent Document 1). In
this height adjustment device of the top plate, the lower end of
the air spring is supported in a rotatable way, and a special
structure with a linkage, rollers, etc. is provided between the
upper end of the air spring and the table. Regarding the adjustment
of the upper thrust by changing the position of the upper end of
the column, the action of the above structure is carried out by
means of a shaft part and is linked to the structure on the side of
the other column. The adjustment of the top plate height is done by
operating with a pedal the air spring set on at least either the
left or right of the table, but how to adjust the two air springs
when the air springs are set on each column is not disclosed in
Patent Document 1.
[0006] As an example of a height adjustment device of a top plate
supported by two support columns, there is proposed a structure
that can change and adjust the length of the two support columns
simultaneously with one operation (Patent Document 2). This height
adjustment device of the top plate is vertically set on the lifting
support columns on both sides of the top plate of the table, and it
is set so that it can move upward and downward but cannot move
backward and forward. The two lifting support columns are linked by
chains engaged around multiple pullies pivotally set on the
immovable members of the table, and the rocking plate is pivotally
set on the immovable members of the table, thereby the rocking
plate and the chains are connected. Further, a screw shaft which
has an axis extending in the up-down direction is set pivotally on
the rocking plate but does not move up and down on the rocking
plate. At the same time, a movable air spring is provided at one
end of the immovable member of the table, and the other end of the
spring is pivotally mounted on an adjustment fitting threaded to
the screw shaft. Thus, in the table supporting the top plate with
multiple support columns, in order to move the top plate up and
down synchronously and smoothly with all support columns, it is
necessary to synchronize the start and end timings and the
operation amount of the height adjustment operation. In the height
adjustment mechanism of the top plate disclosed in Patent Document
2, it requires a linkage mechanism with a complex structure for the
adjustment operation, which takes time to manufacture, assemble and
adjust, and also is the reason for the increased cost.
[0007] In addition, in the combination of a chair and a table,
there is proposed a table in which that changes the front and rear
position based on the tilt state of the back of the chair (Patent
Document 3). In this table, two metal round tubes are bent into a
top view U-shape and an inverted U-shape respectively, and the two
metal round tubes have two struts connected by a plurality of
connecting members, and the two struts are rotatably supported on
the ground by their respective connecting units. The connecting
units are mounted on the struts so that the two struts are
rotatable between the forward tilting position and the backward
tilting position, respectively. The top plate is movable in
parallel while remaining horizontal, the top plate of the table is
allowed to move backward and diagonally downward depending on the
tilt of the chair
[0008] In addition, there has been proposed a workstation with a
monitor and a keyboard, position of them being changeable according
to the posture of the computer user sitting in the chair (Patent
Document 4). In this workstation, a hold part can move parallel
while maintaining a horizontal state, even when support arms, which
corresponds to legs of the table, are tilted. The keyboard base is
supported to the hold part, and the keyboard base elevation angle
is adjustable by changing the tilt angle relative to the hold part.
The keyboard base of this workstation is not support directly to
support arms. In addition, the adjustment of the keyboard base
elevation angle requires a separate structure, the detailed
structure of which is not disclosed in Patent Document 4.
[0009] This applicant for this patent has already proposed in the
established literature (Patent Document 5) a lifting table with top
plate height adjustment device which comprises a top plate and two
or three support columns whose lengths are variable to support the
top plate. Each support column is equipped with an air spring, such
as used in chairs and the like, the length of the support column is
variable by changing the length of the air springs with an
operation pressing a push valve provided on the upper end of the
support column. In general, it is conceivable that two air springs
are operated simultaneously by operating a single operating lever,
but with respect to such structure, it is inevitable that various
errors occur inevitably in manufacturing and assembling the
components that form the path from the operating lever to the push
valve. It is very difficult, for each table specification, to
balance between such manufacturing and assembling errors and the
rigidity of the operating rod which leads to deformation and
distortion during the operation of the operating rod. That is, if
the rigidity of the operating rod is too high, the error appears
directly as a difference in timing of pushing the valve, and if the
rigidity of the operating rod is too low, the amount of operation
of the operating rod is absorbed by the deformation and distortion,
and the time of pushing the push valve changes, which does not
ensure a sufficient amount of pushing pressure for the valve. The
result is that two or more air springs sometimes make it difficult
to move up and down equal amounts, that is, it is difficult to
carry out synchronized action.
[0010] In the lifting table equipped with the above height
adjustment device, in order to adjust the height of the top plate,
it is proposed to improve the operability of adjusting the table
height by coordinating the change of the lengths of any air spring
of support columns, although the operation performed by the user is
just one simple operation. That is, backlash is provided in the
operating path from a handle to the push valve of each support
column, and in operating that handle, after all the backlashes are
absorbed, by making the operation of pushing down all the push
valves start, all the support columns obtain a height adjustment
action synchronized in timing and amount of action.
[0011] In the lifting table where the above height adjustment is
performed, there is not disclosed setting the top plate to an
arbitrary tilt angle, and there is no intention to do so. Also, in
the form of tilting the top plate relative to a plurality of
support columns to change the position of the table in the
front-back direction, in many cases support columns are formed in
parallel rinks and the top plate is moved in parallel. On the other
hand, as an extreme example, depending on what is being worked on
the table, such as a drafting table, a lectern, a display
table/display stand for merchandise or items, in some cases it is
preferable that the top plate can be tilted rather than horizontal.
In order to tilt the top plate relative to the support columns
performed as parallel rinks, a mechanism for tilting the top plate
and maintaining its tilted state is required between the top plate
and the top plate support portion set on the upper part of the
support columns, and the structure of the upper part of the support
column and the top plate support portion has to be more
complicated.
PREVIOUS TECHNICAL LITERATURE
Patent Literature
[0012] Patent literature 1: Texu Bulletin No.11-127964
[0013] Patent literature 2: Texu Bulletin No. 10-262741
[0014] Patent literature 3: Texu Bulletin No. 4364981
[0015] Patent literature 4: Texu Bulletin No. 3642391
[0016] Patent literature 1: Texu Bulletin No. 2017-029453
SUMMARY OF INVENTION
Subject to be solved with Invention
[0017] Therefore, in the table, which includes a top plate, several
support columns which support the top plate and can change its
height by operation, and foot sections, each of which is attached
to the lower end of the support columns, and can support said
support columns at ground level, the subject to be solved is how to
selectively and easily adjust the height and inclination of the top
plate.
[0018] The purpose of the present invention is to provide a table
capable of adjusting the height of the top plate, by using a
mechanism for changing the length of the support columns, even by
the user, who can simply configure the structure. The present
invention achieves its purpose by providing a lifting table capable
of selectively or easily adjusting the height and inclination of
the top plate.
Method for Solving the Task
[0019] The table of the present invention is provided with a top
plate, a plurality of leg units and a plurality of operation units,
said each leg unit has a support column and a foot section, said
support column has upper and lower ends, the length of the
direction connecting the upper and lower ends being changeable, and
the upper end being connected to the top plate, and said foot
section is connected to said lower end of said support column and
is adapted for seating on the floor, said lengths of said support
columns of said plurality of leg units are changeable by operating
one or more said operation units, wherein said each leg unit
belongs to either a first leg unit group which includes one or more
leg units and arranged on one side of the top plate or a second leg
unit group which includes one or more leg unit and arranged on the
other side of the top plate, said each operation unit comprises a
first operating section for changing the lengths of the support
columns of the leg units belonging to the first leg unit group, and
a second operating section for changing the lengths of the support
columns of the leg units belonging to the second leg unit group,
the second operating section being operable independently of the
first operating section.
[0020] The table has, as a basic structure, a top plate, a
plurality of leg units each having a support column and foot
section, and a plurality of operation units, the load of the top
plate (including the weight carried on the top plate) being
supported on the floor by the leg units. The support column and
foot section constitute a leg unit, and said each leg unit belongs
to either a first leg unit group which includes one or more leg
units and arranged on one side of the top plate or a second leg
unit group which includes one or more leg unit and arranged on the
other side of the top plate. That is, any support column belongs to
either of the first leg unit group or the second leg unit group
only, and here, each support column does not belong to the first
leg unit group and the second leg unit group at the same time. No
leg unit belongs to either leg unit group. The length of the
support column of the leg unit belonging to the first leg unit
group is changed by operating the first operating section, and the
length of the support column of the leg unit belonging to the
second leg unit group can be changed by the operation of the second
operating section. The length of the support column of the leg unit
belonging to the first leg unit group and the length of the support
column of the leg units belonging to the second leg unit group can
be changed independently by operating the first operation unit and
the second operation unit individually. In case the lengths of the
support columns belonging to first leg unit group and the lengths
of the support columns belonging to the second leg unit group are
changed to different lengths, the top plate is tilted relatively on
one side to the other side, or can be tilted while changing the
height of the top plate. The height of the top plate can be changed
when the lengths of all legs are changed to the same length. In
addition, because the operation unit is divided into two operating
sections of the first operating section and the second operating
section, in the case of narrower size of the top plate, even one
person user uses both hands to operate each operating section
thereby allowing the height and tilt of the top plate to be
adjusted, and in the case of a wider width of the top plate, two
people can operate operation units by sharing the on each side of
table, and the height and tilt of the top plate can be
adjusted.
[0021] In this table, the foot section of said each leg unit
comprises a foot body portion which is mounted on said support
column and extends in a direction between said one side of the top
plate and the other side, and plurality of foot portions which are
spaced in the direction of their extension and are adapted for
seating on the floor.
[0022] When the top plate is in a tilted state with one side
relative to the other side, the position of the table's center of
gravity is moved causing load imbalance. On the table acts a moment
which tends to make the the table tip in the tilt direction
connecting one side and the other said of the top plate. Each leg
section is provided by spacing with the foot portions that are
adapted to land on the floor in the tilt direction. The
counteracting moment is obtained with a reaction force from the
floor to the foot portions, the resistance to table tipping can be
improved by this counteracting moment.
[0023] In this table, the foot body portion of said leg unit is
fixedly mounted on said support column, the foot portions are
mounted on said foot body portion in a manner that the length of
each foot portion protruding relative to the foot body portion in
the direction to the floor can be changed, said protruding lengths
of said foot portions relative to the foot body section can be
changed corresponding to the tilt angle of the top plate.
[0024] The foot body portion is fixedly mounted on the support
column, the foot body portion also tilts together with the support
column when the top plate and support column tilt. Due to the
special mounting structure in which the foot portions are mounted
on said foot body portion in a manner that the length of each foot
portion protruding relative to the foot body portion in the
direction to the floor can be changed, even if the foot body
portion tilts according to the tilt of the top plate, each foot
portion can be on the floor in its own way and can transfer the
load of the table to the floor by adjusting the protruding height
in the direction. In this case, each foot portion includes a joint
structure such as a ball joint, and the foot body portion is
supported so that each foot portion is preferentially seated on the
ground in its own way, even if it is tilted with the support
column.
[0025] In this table, the foot body portion of said leg unit is
mounted on said lower end of the said support column in a manner
that the mounting angle can be changed,
[0026] the mounting angle of the foot body portion relative to said
support column can be changed corresponding to the tilt angle of
the top plate.
[0027] Since it is possible to change the mounting angle of the
foot body portion relative to the lower end of the support column,
even if the support column tilts corresponding to tilting of the
top plate, the mounting angle of the foot body portion relative to
the support column can be changed according to the tilt of the
support column, so that any foot portions can land on the floor in
its own way, and the table can transmit the load to the floor.
Since the foot body portion and the foot portions can be an
integrated structure, the foot part can be constructed as a simple
structure.
[0028] In this table, both the first and second leg unit groups
have more than two leg units, the support columns of the leg units
belonging to the first leg unit group are in a common first support
column configuration plane, the support columns of the leg units
belonging to the second leg unit group are in a common second
support column configuration plane, and said first configuration
surface and second configuration surface are parallel to each
other.
[0029] When operating the first operation section to change the
length of the support columns of the leg units belonging to the
first leg unit group, all support columns of the leg unit belonging
to the first leg unit group and arranged in a common first support
column configuration plane synchronize and be adjusted to the same
length. When operating the second operation unit, all support
columns of the leg unit belonging to the second leg unit group and
arranged in a common second support column configuration plane
synchronize and be adjusted to the same length. In making the
lengths of the support columns of the leg units belonging to the
first leg unit group and belonging to the second leg unit group to
the same length, only the height of the top plate is changed, and
when the two lengths are changed to different lengths, the top
plate is tilted according to the difference in length, or it can be
tilted while changing the height of the top plate.
[0030] In this table, said foot portions mounted on the support
columns of the leg unit belonging to the first leg unit group and
said foot portions mounted on the support columns of the leg unit
belonging to the second leg unit group are connected by the
connecting member so that the relative position changes of the both
said foot portions resulting from the inclination of said top plate
can be absorbed.
[0031] The connecting member connects foot portions mounted on the
support columns of the leg unit belonging to the first leg unit
group and said foot portions mounted on the support columns of the
leg unit belonging to the second leg unit group, in the state of
absorbing the changes of relative spacing and rotation of the two
foot sections approaching and separating from each other according
to the tilt of the top plate. Further displacement or deformation
of the two foot sections that increases the relative spacing or
rotation of the two foot sections in connected state can be
prevented, and displacement or deformation of the two foot sections
in connected state that causes the relative lateral movement or
twisting can be suppressed. The leg and foot structure can improve
the rigidity of the structure and contribute to stability.
[0032] In this table, said leg units includes four leg units, each
arranged at point corresponding to the four vertices of the
parallelogram, said one side and said other side of the top plate
are the two opposite sets of sides of said parallelogram, with
respect to each of the two sets of sides of the top plate, said
foot units are defined as belonging to either a first leg unit
group or a second leg unit group, and two operating sections are
defined as belonging to either a first operating section or a
second operating section.
[0033] Regarding this table, there exists two pairs of opposite
sides in the table, each set consisting of one side and the other
side of the table, because with respect to each of two pairs of
opposite sides in a parallelogram, there are one side and the other
side. With respect to the four leg units, two leg unit group are
determined in each pairs of sides of the table. With respect to the
operation unit, a first operation section and a second operation
section for operating the two leg unit groups are provided in each
pairs of sides of the table. That is, since there are two sets of
operating sections with respect to the first and second operating
sections, the set of operation units to be operated in the case of
tilting the top plate is selected according to the tilting
direction selected between the two tilting directions.
[0034] In this table, said each leg unit includes a top plate
support structure that is mounted on the top plate and the upper
end of the support column, for connecting the upper end of the
strut to the top plate, in each of said leg units, one of the
operating sections belonging to said first operating section and
one of the operating sections belonging to second operating section
extends into said top plate support structure, and the length of
the support column can be changed by operating either of said two
operating sections.
[0035] In this table, in order to support the top plate,
corresponding to the four vertices of the parallelogram (four
corners), the top plate receiving structure is mounted in the upper
end portion of each support column, one of one set of operation
units and another set of operation units is extended along the two
sides across each corner and into the top plate receiving
structure. For each support column corresponding to the four
corners, the length of support column is set to be changeable by
operation from any of the operating sections on either side. Thus,
the top plate is tilted in one of the two groups on one side and
the other side, and since it can be operated on either group, the
top plate can be tilted in one of the two tilt directions.
[0036] In this table, the foot sections are rotatably mounted on
said support columns according to the selected tilt direction so
that the direction in which said foot body portion extends follows
said tilt direction.
[0037] The foot section is mounted in a rotating form relative to
the support column with a direction of its extension in line with
the direction of tilt according to the selected direction of tilt.
By making the foot section rotate relative to the column, the foot
section can readjust the tilt to the selected group even in the
case of tilting on the other side because it can make the direction
of extension coincide with the direction of tilting with the top
plate. Therefore, this structure can easily counteract the tipping
moment of the table due to tilting.
[0038] In this table, the height of the top plate can be changed by
changing the support column lengths of the leg units belonging to
the first and second leg unit groups to the same length.
[0039] With respect to wide table with four support columns, one
person cannot operate the table with two operating sections of
horizontal length at the same time. Even in the case of two people
operating, the invention can change the height by operating equal
amounts separately.
EFFECT OF INVENTION
[0040] The table of this invention can have the following unique
effects.
[0041] This table has, as a basic structure, a top plate, a
plurality of leg units each having support column and foot, and a
plurality of operating portions, each leg unit belonging to either
a first leg unit group provided on one side of the top plate or a
second leg unit group provided on the other side of the top plate;
the support columns of the leg units belonging to the first leg
unit group are variable in length by operating the operating
portion, and the supports of the leg units belonging to the second
leg unit group. The length of the support column of the leg unit
belonging to the first leg unit group and the length of the support
column of the leg unit belonging to the second leg unit group are
changed by the operation of the first operation section or the
second operating individually. When the lengths of the support
columns are changed to the same length, the height of the table is
changed. When the lengths of the support columns are changed to the
different lengths, the table is tilted from one side to the other
side, or the height and tilting of the table are changed. Since the
operation unit is divided into two operation units of the first
operation section and the second operation section, the user can
make height adjustment and tilt adjustment by operating each
operation section alone. Alternatively, two people can operate the
respective operation sections. Each of the first operation section
and the second operation section is itself a mechanism for changing
the length of the leg unit which has been used in a lifting table
capable of changing the height of the top plate. The table of this
invention is provided, by utilizing and devising this mechanism, in
which the structure thereof can be made as simple as possible, and
the height and tilting of the top plate can be easily adjusted by
operating the first operation section and the second operation
section individually.
BRIEF DESCRIPTION OF DRAWINGS
[0042] FIGS. 1A-1C are views of the first embodiment of the table
according to the present invention.
[0043] FIG. 2 is a perspective view showing a part of the table
shown in FIGS. 1A-1C when viewed from the inside.
[0044] FIGS. 3A-3C are views explanatory views showing the
structure of the leg unit of the table shown in FIGS. 1A-1C.
[0045] FIGS. 4A-4C are views showing an operation unit of the table
shown in FIGS. 1A-1C.
[0046] FIGS. 5A-5B are explanatory views showing the inclination of
the top plate of the table shown in FIGS. 1A-1C.
[0047] FIGS. 6A-6B are perspective views showing the second
embodiment of the table according to the present invention.
[0048] FIGS. 7A-7B are explanatory views showing the connection
structure of a foot section and a support column of the leg unit
shown in FIGS. 6A-6B.
[0049] FIGS. 8A-8B are perspective view showing the third
embodiment of the table according to the present invention.
[0050] FIG. 9 is a perspective view showing the fourth embodiment
of the table according to the present invention.
[0051] FIG. 10 is a perspective view showing the fifth embodiment
of the table according to the present invention.
[0052] FIG. 11 is a perspective view showing the operation sections
and top plat support structure in the embodiment shown in FIG.
10.
[0053] FIGS. 12A-12D are explanatory views showing the rotational
configuration of the foot section of the leg unit of the table
according to the present invention.
[0054] FIGS. 13A-13B are schematic diagrams showing the sixth
embodiment of the table according to the present invention.
[0055] FIGS. 14A-14B are schematic diagrams showing other
embodiments different in top plate shapes of the table according to
the present invention.
DETAILED DESCRIPTION
[0056] Referring now to the embodiments of the invention shown in
the attached drawings, FIGS. 1A-5B are drawings representing an
embodiment of the table. FIGS. 1A-1C show a perspective view and a
side view of the first embodiment of the table according to the
present invention. FIG. 2 shows a perspective view representing a
portion of the table when viewed from the inside. FIGS. 3A-3C show
the leg unit of this table, i.e., a leg structure including a
support column and a foot section, and a top plate receiving
structure for connecting the top plate and the support column.
FIGS. 5A-5B are explanatory views showing the inclination of the
top plate of the table.
[0057] FIGS. 1A-1C represent an implementation example of the table
according to the present invention. FIG. 1A is a perspective view
showing the table in which the top plate is in a high position and
in a horizontal state, FIG. 1B is a side view thereof, and FIG. 1C
is a side view showing the table in which the top plate is in a low
position and in a horizontal state. The table 1 includes a top
plate 2, a leg structure 3 for supporting the top plate 2 on a
surface F and an operation unit for tilting the top plate 2 (see
FIG. 2 and FIGS. 4A-4C, etc. for details, as the operation unit 30
will be expressed later). The top plate 2, can be made of various
materials such as resin, metal, and glass.
[0058] In the case of this embodiment, the top plate 2 is a plate
that is rectangular in a plane view and is most commonly used as a
top plate of the table for office use or for work. The top plate 2
is supported on the floor surface F by a leg structure 3 consisting
of four leg units U1 to U4 in the four corners corresponding to the
top plate 2. Each leg unit U1 to U4 has a support column 5 of
variable length on the upper end of which is mounted the top plate
2, and a foot section 6 mounted on the lower end of the support
column 5. In case the upper end of the support column 5 is mounted
on the top plate 2 by means of a top plate receiving structure 4
mounted slightly inboard of each corner of the top plate 2, Each
leg unit U1 to U4 may include the top plate support structure 4.
The load of the top plate 2 and objects placed on the top plate 2
is transferred from the top plate receiving structure 4 to the
support column 5, and the load applied to the support column 5 is
supported on the ground F via the foot section 6. In this
embodiment, each support column 5, as shown in FIG. 1B and FIG. 1C,
has a top plate supporting structure 4 mounted on its upper end 5a,
and is mounted at its lower end 5b in an upright setting relative
to the foot section 6. In each leg unit U1 to U4 of the leg
structure 3, the top plate support structure 4, the support column
5 and the foot section 6 have substantially the same structure.
Thus, each leg unit U1 to U4 at the four corners have the same
structure except for the different orientation of the arrangement
around the longitudinal axis of the support column 5.
[0059] In this embodiment, four leg units U1 to U4 are arranged
along the long side edges "a", "a", and are classified into two leg
unit groups, i.e., the first leg unit group G1 and the second leg
unit group G2. Each leg unit U1 to U4 belongs to either of the leg
unit groups G1 or G2. The first leg unit group G1 arranged along
one long side edge "a" of the top plate 2 (the front side in FIG.
1A, the left side in FIG. 1B and FIG. 1C) consists of two leg units
U1, U2, and the second leg unit group G2 consists of two leg units
U3, U4 arranged along the other long side edge of the top plate 2.
There is no leg unit which belongs to both leg unit groups G1, G2,
and there are no leg units that do not belong to either leg unit
group G1 and G2. In this embodiment, the first leg unit group G1
and the second leg unit group G2 are arranged substantially
symmetrically with respect to the vertical planes including the
lateral center line L-L which connects the respective intermediate
positions of the short side edges "b", "b". It should be noted that
the top plate 2 is in a horizontal state when the lengths of the
leg units U1 to U4 (i.e., the length of each support column 5) are
equal.
[0060] The longitudinal centerline (in line with the centerline of
the long axis direction of the support column 5) of each leg unit
U1 to U4, mounted on the top plate 2 through the top plate
receiving structure 4, is perpendicular to a plane defined with
respect to the top surface of the top plate 2. The top plate 2 and
each leg unit U1 to U4 are always in an orthogonal state. As shown
in FIG. 1B and FIG. 1C, the support column 5, 5 belonging to the
first leg unit group G1 are arranged in a common first support
column configuration plane P1 parallel to one long side edge "a",
and the support column 5, 5 belonging to the second leg unit group
G2, 5 are arranged in a common second support column configuration
plane P2 parallel to the other long side edge "a". The first
support column configuration plane P1 and the second support column
configuration plane P2 are parallel to each other. The support
column 5, 5 of the leg units U1, U2 belonging to the first leg unit
group G1 are adjusted synchronously to the same first length, and
the support column 5, 5 of the leg units U3, U4 belonging to the
second leg unit group G2 are adjusted synchronously to the same
second length. The top plate 2 is adjusted to a tilted state, when
the first length and the second length are different lengths. When
an attempt is made to tilt the table 1, the operation of the
operation unit 30, as shown by the arrow T in FIG. 1A, causes the
top plate 2 to tilt in the tilting direction. That is, in the case
of this embodiment, the top plate 2 is tilted in such a way that
the long side edges "a", " a" is maintained in a horizontal state
while the shorter side edges "b", "b" is tilted in a vertical
direction.
[0061] In the table 1, the top plate 2 is placed, at its four
corners, on the leg units U1 to U4, and supported on the ground F
by the foot section 6 set on the lower end of each support column
5. Each foot section 6 has a foot body portion 7 in the shape of
one square tubular and a plurality (in this example, two) of
footing portions 8, 8, the foot body portion 7 being fixedly
mounted on the lower end portion 5b of the support column 5, and
footing portions 8, 8 being mounted on the foot body portion 7 in
the longitudinal direction thereof and spaced apart relative to
each other at the positions on both sides of the support column 5
and adapted to seat on the ground F. The foot body portion 7
extends in the direction parallel to the short side edges "b", "b"
of the top plate 2 corresponding to that inclination direction,
when assuming an inclination of the top plate 2.
[0062] In each foot section 6, one foot portion 8 passes through
the foot body portion 7 and extends upward, and the mounting
position of the foot portion 8 in the height direction relative to
the foot body portion 7 is changeable by means of the foot axis 9
for when trying to tilt the top plate 2. One foot portion 8 has a
variable height of protrusion to the ground F side relative to the
leg body portion 7 according to the angle at which the top plate 2
is tilted, but the other leg portion 8 is fixed without penetrating
the foot body portion 7 in a way that is buried in the foot body
portion 7. In the case of the tilted state of the top plate 2
raised on the side of the second leg unit group G2, a long foot
shaft 9, 9 that penetrates the foot body part 7 is used in the foot
portions 8, 8.
[0063] The foot sections 6, 6 (first foot section group 6G1)
mounted on the two support columns 5, 5 of the leg units U1, U2
belonging to the first leg unit group G1 are connected to each
other by an elongated foot connector 10. The foot connector 10 has
a function of increasing unity(rigidity) of the first leg unit
group consisting of the leg units U1, U2. For the foot sections 6,
6 (second foot section group 6G2) of the leg units U3, U4 belonging
to the second leg unit group G2, another leg connector 10 improves
the unity(rigidity).
[0064] The foot connectors 10,10 are bent to each other and close
to the central side in order not to obstruct the feet of the user
using the table 1. The foot connectors 10,10 may be made in the
straight shape as shown by imaginary lines, if they do not obstruct
the feet of the user using the table 1. The foot connectors 10a,10a
can be made of a bar or barrel material having a suitable
cross-sectional shape, and in addition. Each support column 5 may
be mounted on the connector 10 for connecting the foot sections 6,
6, instead of being mounted to the foot body portion 7 itself.
[0065] As described later, the support column 5 have a nested outer
cylinder 11 and an inner cylinder 12, and in the event that the
outer cylinder 11 and the inner cylinder 12 do not adequately
ensure the length of the support column 5, a complementary
connecting cylinder 5c can be used in the manner of replenishment
to the outer cylinder 11 (refer to FIGS. 7A-7C for details). Since
the length of support column 5 is variable, each support column 5
has a locking structure 17 for maintaining the length of the
support column 5. The locking structure 17 holds the inner cylinder
12 at the upper end of the outer cylinder 11, and well-known
grasping tools as fastening structure can be used. Although not
illustrated in detail, the several fastening structures can be
used, such as a fastening structure provided inside the outer
cylinder 11 presses the cam member against the outer side of the
inner cylinder 12 and grips it, and a fastening the structure on
the outer cylinder 11 clamps the inner circumference of the
installed locking structure 17 relative to the circumference of the
inner cylinder 12 by friction. Further, like the locking structure
17a shown in FIG. 3A and FIG. 3B, a small screw is screwed into the
cap body mounted on the upper end of the outer cylinder 11, and a
structure that presses the front end thereof against the outer side
of the inner cylinder 12 can also be used. The locking structure 17
or 17a prevents the support column 5 from accidentally shortening
in length caused by the inner cylinder 12 descending in the outer
cylinder 11 even when a large load is applied to the top plate
2.
[0066] FIG. 2 is a perspective view showing a part of the table
shown in FIGS. 1A-1C when viewed from the inside. In FIG. 2, the
same reference numbers or codes as those used in FIGS. 1A-1C are
used to the same or corresponding elements and parts as those shown
in FIGS. 1A-1C. A rod-like first operation unit 301 is arranged
along one side edge "a" of the top table 2 for the leg units U1, U2
belonging to the first leg unit group G1 provided corresponding to
said one side edge "a", and a rod-like second operation unit 302
similar to the first operation unit 301 is arranged along the other
side edge "a" of the top table 2 for the leg units U3, U4 belonging
to the second leg unit group G2 provided corresponding to said the
other side edge "a" (the operation unit is indicated as unit 30
when the operation section 301 and 302 are referred to in general).
With respect to the two leg unit groups G1 and G2, the first
operation unit 301 and the second operation unit 302 are operated
individually, so that the support columns 5, 5 of the leg units U1,
U2 belonging to the first leg unit group G1 and the support columns
5, 5 of the leg units U3, U4 belonging to the second leg unit group
G2 can be operated separately. According to the operation section
30, the air springs, more specifically the push valves set in the
air springs, are operated synchronously as adjustment mechanisms
which are provided for changing the lengths of the support columns
5, 5 of the two leg units belonging to each leg unit group G1, G2.
Details about the section 30 will be described later with reference
to FIGS. 3A-3C and FIGS. 4A-4C.
[0067] FIGS. 3A-3C illustrate the support column of the table, the
top plate receiving structure associated with it, and the foot
section in detail. In FIGS. 3A-3C, the same reference numbers or
codes as those used in FIGS. 1A-1C are used to the same or
corresponding elements and parts as those shown in FIGS. 1A-1C.
FIG. 3A shows the leg unit, i.e., the foot structure including the
support column and the foot section, and the top plate receiving
structure. FIG. 3B is an enlarged view indicating the details of
the top plate support structure, which is intervened between the
top plate and the support column in order to connect them. FIG. 3C
is an enlarged cross-sectional view indicating the details of the
foot section. As shown in FIG. 3A and FIG. 3B, each support column
5 of the leg unit (the leg unit U2) is provided with the inner and
outer cylinders (outer cylinder 11 as an air spring cover and inner
cylinder 12) which are inserted and fitted to each other into a
nested shape as a support column length adjustment mechanism, an
air spring 13 is built in the inner cylinder 12. The outer cylinder
11 and the inner cylinder 12 can slide relatively in the guided
longitudinal direction (the standing direction of the support
column) by the sliding structure, for example, formed in the upper
end of the outer cylinder 11 and the convex shape of the inner
cylinder 12. The lower end of the inner cylinder 12, although not
shown, can slide relative to the inner circumference of the outer
cylinder 11 by an appropriate slider. The locking structure 17a of
the outer cylinder 11 and the inner cylinder 12 is illustrated. The
embodiment shown in FIGS. 3A-3C does not use a replenishment
cylinder 5c for extending the length of the support column 5.
[0068] The outer cylinder 11 (the connecting cylinder 5c in the
case where the connecting cylinder 5c is attached below the outer
cylinder 11) is mounted with the lower end 14 (equivalent to the
lower end 5b of the support column 5) standing on the foot body
portion 7. The top plate receiving structure 4 mounted on the lower
surface of the top plate 2 and the upper end 15 of the inner
cylinder 12 (equivalent to the upper end 5a of the support column
5) are made of iron or resin such as polypropylene reinforced by
fiberglass, and each of them may be manufactured separately, and a
plurality of parts or materials can be assembled by fixing, for
example, with blind rivets and the like. They can be also
manufactured by integral molding. In addition, the structure of
each support column 5, as the table of the present applicant, is
disclosed in the application that has been filed (Patent literature
5).
[0069] Each support column 5 has air spring 13 built in, the length
of which can be changed by operating the operation unit 30. As for
the air spring 13, although not specifically illustrated, a
well-known structure can be used, which has a cylinder and piston
rod being able to enter and exit by sliding relative to the
cylinder, such as used in the field of the chair. Also, as for the
air spring 13, the lower base end portion of the cylinder is fixed
to the lower end portion 14 of the outer cylinder 11, and the upper
end of the piston rod is fixed to the upper end 15 of the inner
cylinder 12. The load acting on the top plate 2 is transmitted to
the ground F from the top plate receiving structure 4 mounted
directly on the top plate 2 via the support column 5 through the
leg structure 3. That is, this load is transmitted, in each support
column 5, from inner cylinder 12 via the air spring 13 and the
outer cylinder 11, to the foot structure 3, and supported on the
ground F.
[0070] Referring to FIG. 3A and FIG. 3B, the top plate receiving
structure 4 is overall a substantially U-shaped groove structure or
a disc-shaped structure having a square shape, having a disc-shaped
side wall portion 22 and a bottom wall portion 23 forming inside a
central concave portion 21 in the interior. A flange portion 26
having a flat surface is continuously formed to the upper end of
the side wall portion 22. In a state that the flat surface of the
flange portion 26 is in contact with the lower surface of the top
plate 2, the flange portion 26 is attached to the top plate 2 by an
appropriate fastener 24 (marked for a portion only), such as a
blind rivet, as a result the top plate receiving structure 4 is
mounted on the top plate 2. The top plate receiving structure 4 may
be a structure in which the side wall portion 22 and the bottom
wall portion 23 are molded in one piece and may be manufactured
separately and secured with something obtained by a fastening tool
such as a blind rivet. The top plate receiving structure 4 may have
the side wall portion secured to the top plate 2 at the appropriate
location of 22, and may also be secured from the lower side of the
top plate 2. That is, the top plate receiving structure 4 is
applied to the lower side of the top plate 2, sticking blind rivets
through the side wall portion 22 into the top plate 2 from the
lower side thereof, so that the top plate receiving structure 4 is
attached to the top plate 2 without rivets sticking out on the
upper surface side of the top plate 2. Regarding the top plate
receiving structure 4, although it is an alternative embodiment, a
perspective view is also shown in FIG. 11.
[0071] In order to make it possible to operate the air spring 13,
the upper end of the piston rod protrudes through the upper end
portion 15 of the inner cylinder 12 toward the internal space
determined by the central concave portion 21 of the top plate
supporting structure 4, and the push valve 16 of the air spring 13
is exposed in the internal space. To operate the push valve 16
exposed into the interior space, the operation tip portion of the
operation unit 30 extends into the interior of the top plate
receiving structure 4. The push valve 16 is pushed in by operating
the operation portion 30, whereby the movement of the gas within
the air spring 13 is controlled and the piston rod advances or
retracts from the cylinder. By such action of the air spring 13,
the inner and outer cylinders 11 and 12 perform a telescopic
action, changing the length of the support column 5. Depending on
the weight placed on the top plate 2 of the table 1, the gas
pressure (5 kg, 8 kg, 10 kg, 20 kg, etc.) inside the air spring 13
is adjusted. The structure of the operating section 30 inside the
top plate support structure 4 (connection 34 and the lever pivot
part 35, etc.) to operate the air spring 13 will be described later
referring to FIGS. 4A-4C (FIG. 11).
[0072] FIG. 3C is an enlarged view showing the foot section 6 of
the foot structure 3. In FIG. 3C, one foot section 6 to be attached
to one support column 5 is shown, other foot sections also have the
same structure. In the illustrated example shown in FIGS. 3A-3C,
foot portions mounted on the foot body portion 7 of the foot
section 6 are the foot portion 8a having a foot shaft 9b and the
foot portion 8b having a short foot shaft 9b. The foot shaft 9a of
the foot portion 8a is longer than the foot shaft 9b of the foot
portion 8b, as will be described later. In the hypothetical tilted
state of the top plate 2, where the first leg unit group G1 is
raised, the foot body portion 7 of any foot section 6 is raised on
the long foot shaft 9a than the short foot shaft 9b. At the lower
end of the foot shafts 9a, 9b, the seating body 8c on the ground F
is mounted. The seating body 8c is formed as a roughly conical body
and contacts the floor surface F on the wide seating surface.
[0073] When the top plate 2 is set to a tilted state, the center of
gravity as a whole on the table 1 moves in the tilted direction.
Load imbalance causes a tilting moment that tends to fall the table
1 in the tilted direction as a whole. The support column 5 is
secured to the foot body portion 7 in the position biased to the
side lifted by tilting (foot portion 8b side) with respect to the
longitudinal center position of the foot body portion 7. By fixing
the support column 5 to the foot body part 7 in the offset
position, it is possible to make the distance d2 from the
attachment position of the support column 5 to the foot portion 8b
extending to the downwardly inclined side longer than the distance
d1 from the attachment position of the support column 5 to the foot
part 8a extending to the upwardly inclined side, and the foot part
8b can be mounted at a position away from the support column 5.
[0074] Such a structure makes it easy to obtain the large
countering moment acting on the table 1 when the lifting platform 1
is tilted, based on the reaction force acting from the floor
surface F on the foot portion 8b on the downwardly inclined side.
That is, the footing portions 8a, 8b of each foot section 6 are
spaced apart in line with the tilting direction and in line with
longitudinal direction thereof, and the lower end portion 5b of the
support column 5 is intervened between the footing portions 8a, 8b,
the distance of the support column 5 from the lower end portion 5b
to the foot portion 8b extending down the tilting side is set to a
larger configuration. As a result, even if a tipping moment is
generated on the table 1, it is possible to obtain the large moment
countering to the tipping moment, based on the reaction force
acting on the foot portion 8a, 8b from the floor surface F, and
resistance to a fall of the table 1 can be improved.
[0075] For the longer foot shaft 9a, as shown in the example of
FIG. 3C, it is constituted on the screw shaft 40. By means of two
nuts 41, 42 screwed to the screw shaft 40 from the upper and lower
sides of the foot body portion 7, the foot shaft 9a is fixed to the
foot body portion 7 at any height position in the direction of its
axis, and slackness can be prevented by washers 43, 44 interposed
between the nuts 41, 42 and the foot body portion 7. For the
shorter foot shaft 9b, a threaded shaft 45 likewise as a screw
shaft 40, is fixed to the foot body portion 7 by screwing the screw
shaft 45 into the threaded hole 46 formed in the foot body portion
7. Joint structures such as a ball and socket joints 47 are
provided at the connection portions between the foot shafts 9a, 9b
and the seating body 8c by using a structure, so that the seating
body 8c is square to the ground F even if the foot shaft 9b or 9b
is tilted, i.e. it can be seated in the original manner.
Alternatively, for shorter foot shaft 9b, the foot portion 8b is
screwed into one of a plurality of screw-in positions (e.g., a
plurality of threaded holes 46b) relative to the foot body portion
7, or the foot portion 8b is made slidable relative to the foot
body portion 7. The installation position can also be selected
according to the degree of tilt utilized.
[0076] With respect to the lengths of the support columns 5, 5
belong to the first and second leg units U1, U2 of the first leg
unit group G1, and the lengths of the support columns 5, 5 belong
to the third and fourth leg units U3, U4 of the second leg unit
group G2, the lengths of the former and the lengths of the latter
can be changed respectively(independently), and within each leg
unit group G1, G2, the lengths of the former and the lengths of the
latter can be separately. In order to coordinate such length
changes between the former and the latter, an operation unit 301 is
provided for the leg unit group G1 and an operation unit 302 is
provided for the leg unit group G2 (refer to FIG. 2). When the user
performs the operations of the operation unit 301 and 302
individually, the support columns 5, 5 of the first and second leg
units U1, U2 belonging to the first leg unit group G1 can be
coordinated to change their lengths to the same length; the support
columns 5, 5 of the third and fourth leg units U3, U4 belonging to
the second leg unit group G2 can also be coordinated to the same
length. The operation units 301 and 302 can be operated
independently of each other without mutual influence, so that
independent operation of the operation units enables the lengths of
the first leg unit group G1 and the second leg unit group G2 to be
different lengths according to the amounts of operations and the
top plate 2 to be tilted relatively to one side so that the other
side is tilted relatively, or the height of the top plate 2 can be
changed and further tilted. Even if the user is a person, the tilt
of the top plate 2 can be adjusted by operating the operating
portions 301 and 302 individually. When the user operates the
operation unit 301 and 302 with the same amount, the height of the
top plate 2 can be changed.
[0077] FIGS. 4A-4C illustrate a detail of an operation unit for
tilting the table. FIG. 4A is a perspective view showing the whole
of this operation unit and the top plate receiving structure with
the inner side as the surface side, and FIG. 4B is a perspective
view showing this operation unit and the top plate receiving
structure as a part of the operation unit shown in FIG. 4A and the
top plate receiving structure on one side, as viewed from the
surface side. FIG. 4C is a partial cross-sectional view showing the
details of the L-shaped connecting member. Regarding the operation
units 301, 302, for simplicity, only one operating section
(reference numeral 30 is used as a symbol for the general term for
the operating section containing each constituent element) is
described. The operating section 30 includes the handle portion 31
extending straitly along the long side edge "a" (cf. FIG. 2) and
operation rod section 32, 32 extending individually from the handle
portion 31 into the top plate support structures 4, 4 provided
corresponding to all the support columns 5 (in this example, two
support columns) belonging to the same group of leg units and for
operating an air spring 13 (cf. FIG. 3A). The operating rod section
32, 32 extend in the right and left directions from the handle
portion 31 individually, each operating rod section 32 includes the
first rod portion 33a extending straitly, the L-shaped connector 34
provided at the front end of the first rod portion 33a and the
second rod portion 33b extending from the connector 34
longitudinally (thus, perpendicular to the first rod portion 33a)
and straightly into the top plate receiving structure 4. The first
rod portion 33a and the second rod portion 33b constitute a
plurality of rod portions (collectively referred to as the symbol
"33") connected by the connector 34. In order to make it easy for
the user to grasp the handle portion 31 by hand, the handle portion
31 is formed in a curved shape toward the front side (indicated by
an imaginary line).
[0078] As shown in FIG. 4A and FIG. 4B (also FIG. 1B and FIG. 1C),
in the operating section 30, the axis of the handle portion 31 and
the axis of the operating rod portion 32, 32 which include the
first rod portions 33a, 33b, connectors 34, 34 and the second rod
portions 33b, 33b are arranged in the one common plane. By
arranging the axes of the operation unit 30 to be in a common
plane, errors and gaps in the structure of the operation unit 30
are reduced and the correctness of the action when operating the
operating section 30 is increased. Each second rod portion 33b
extends through the long hole 25 formed longitudinally in in the
disk-shaped sidewall portion 22 of the top plate receiving
structure 4 into the central concave portion 21 of the top plate
supporting structure 4, the front tip portion of the second rod
portion 33b is formed as a flat air spring operating portion 36.
The second rod portion 33b is supported in the top plate receiving
structure 4 in a manner that the second rod portion 33b can incline
vertically at the lever pivot portion 35 formed in the middle of
the length thereof. When a user grasps the handle portion 31 by
hand and brings the operating portion 30 close to the direction
(direction intersecting the paper and going to the back of the
paper in FIG. 4A) of the top plate 2, the second rod portion 33b of
each operating rod portion 32 performs a rotating action by lever
action relative to the top plate receiving structure 4 at the lever
pivot portion 35 as the pivot point, and the air spring operating
portion 36 rests against the push valve 16 of the air spring 13.
Both operating rod portions 32, 32 simultaneously push down the
push valve 16, 16, to activate both air springs 13,13. Also, with
respect to the top plate receiving structure 4, the bottom wall
portion 23, the flange portion 26 and the fixing member 24 have
been described in FIGS. 3A-3C.
[0079] As shown in FIG. 4C, the L-shaped connector 34 has two holes
34a, 34a, one hole 34a formed at one end for insertion of the first
rod portion 33a and the other hole 34a formed at the other end for
insertion of the second rod portion 33b. Each hole 34a has an inner
diameter insertable with the first rod portion 33a and the second
rod portion 33b and sufficient clearances Ga, Gb are left between
the end faces of the first and second rod portions 33a, 33b and the
bottoms of holes 34a, 34a, respectively. The connector 34 has
threaded holes 34b, 34b formed from its outer side thereof in an
open manner crossed and opened to the holes 34a, 34a. Small screws
34c, 34c contact the inserted first rod portion 33a and second rod
portion 33b by screwing into the holes 34b, 34b, and the two rod
portions 33a,33b can be fixed to the connector 34 in their
positions and postures. With respect to the connector 34,
sufficient rigidity and strength is provided so that it does not
substantially deform under normal operating forces, and the
threaded holes 34b, 34b are made of metal or nylon (reinforced with
fiberglass) so that the threaded slots 34b, 34b are not prone to
rusting and breaking.
[0080] In the fabrication of the operation unit 30, machining
errors or assembly errors may arise due to machining or assembly
incorrectness. For example, the handle portion 31, the first rod
portion 33a, 33a and the second rod portion 33b, 33b are not
precisely in one plane, the first rod portion 33a and 33a are not
integrated in one common line, and furthermore there is even the
second rod portion 33b and 33b are not parallel to each other. In
these cases, it will be extremely difficult to operate the push
valve 16,16 of the air spring 13,13 simultaneously and in equal
amounts by the handle portion 31 alone. In addition, in the case of
making the first rod portion 33a,33a and the second rod portion
33b,33b as one continuous and integral piece from a long rod
material without using the connector 34,34, it is difficult to make
the two sets of first and second rod portions 33a and 33b to be
arranged in one plane. When increasing the rigidity of the rod as
one piece, the push valve 16,16 of the air spring 13,13 work at
different operation timings, which makes difficult the tuning
action of the push valve 16,16. On the contrary, when decreasing
its rigidity, large deformation of bending or twisting is easily
produced at the bent portion from the first rod portion 33a to the
second rod portion 33b, and even if the operating amount of the
handle portion 31 is increased, the operating amount cannot be
transferred to the second rod portion 33b,33b, eventually resulting
in the inability to fully press the push valve 16,16. In this case,
it takes much time to change the height of the top plate 2.
[0081] According to the operation unit 30 of this embodiment, by
using the connector 34, in the state before fixation, the connector
34 is allowed to rotate around two axis (axis 0 of the first rod
portion 33a and axis .delta. of the second rod portion 33b) for the
first rod portion 33a and the second rod portion 33b. Also, in the
state before fixation, the first rod portion 33a and the second rod
portion 33b can move within the allowed range defined by the gap Ga
and a gap Gb in the axis direction X of the first rod portion 33a
and the axis direction Y of the second rod section, respectively.
Because such rotation and movement are allowed, the handle portion
31 of the operation unit 30 is operated in the state of loosening
the small screws 34c, 34c, the insertion amount and rotation angle
amount of the first rod portion 33a, 33a and the second rod portion
33b, 33b relative to the connectors 34, 34 are adjusted so that
both of the air spring operating portions 36, 36 formed at the tip
end of the second rod portion 33b, 33b contact with the push valve
16, 16 of the air spring 13, 13 (only in contact with it, not
pushed in). In this contact state, the small screw 34c, 34c is
screwed into the connectors, even after the operation of the
operation unit 30 is released, the first rod portion 33a, 33a and
the second rod portion 33b, 33b are holed in fixed condition to the
connector 34, 34, and the operation unit 30 is maintained in an
integrated structure as a whole. After absorbing such errors and
gaps and maintaining a fixed state, the user operates the operation
unit 30, and with the help of the high rigidity of the connectors
34, 34 against bending and twisting deformation, an operation on
the handle portion 31 is not absorbed in the middle of the path,
and is transferred to the air spring operation section 36, 36 of
the second rod portion 33b, 33b, which tunes to the operation of
the push valve 16, 16 of the air springs 13, 13, that is, the
second rod portion 33b, 33b are in contact with the push valve 16,
16 at the same time and can be pushed in equal amounts. In this
way, even if the handle portion 31, the first rod portion 33a, 33a
and the second rod sections 33b,33b do not have precise alignment
and parallelism in the manufacturing process, the operation unit 30
is assembled together with the top plate receiving structure 4, 4
in the state without manufacturing errors caused by both processing
and assembly.
[0082] The structure of the operating rod portion 32 using
connector 34 is not necessary for all operating rod portions 32
extending within each top plate receiving structure 4. That is,
this applies not only to two leg units belonging to one group, but
also to three or more leg units belonging to one group. One
operating rod section 32 extends directly into the top plate
receiving structure 4 without using the connector 34 (third rod
section), and all remaining operating rod sections 32 may have a
structure that uses the connector 34. The operating rod section 32
that extends directly into the top plate receiving structure 4
serves as a reference operating rod section when synchronizing with
the other operating rod sections 32. That is, the operation unit 30
is operated in the state of loosening the small screws 34c and 34c
in all the connectors 34 used, the third rod portion, which extends
into the top plate receiving structure 4, is brought into contact
with the push valve 16 of the air spring 13. In this state, in the
remaining operating rod sections 32, the air spring operating
portion 36 formed at the tip end of the second rod portion 33b can
be brought into contact (only in contact and not pushed in) with
the push valve 16 of the air spring 13, by adjusting the amounts of
insertion and rotation angle of the first rod portion 33a and the
second rod portion 33b relative to the connector 34. In this state
of contact, all the small screws 34c, 34c are secured to the
connector 34 by screwing into the connector 34, the first rod
portion 33a and the second rod portion 3b are fixed to the
connector 34, the operation unit 30 may be a one-piece assembly
structure. Then, when the user operates the operating section 30,
in all of the operating rod sections 32 including the third
operating section, the operation on the handle portion 31 is not
absorbed midway, but transferred to all of the air spring operating
portions 36, allowing all of the push valves 16 of the air spring
13 to perform in synchronized operation.
[0083] FIGS. 5A-5B illustrate the tilt of the top plate for the
tilt-adjustable table shown in FIGS. 1A to 4C. The same symbols are
used in FIGS. 5A-5B for elements or parts that are equivalent to
the elements or parts shown in FIGS. 1A-1C. In the state shown in
FIG. 5A, the length of the support column 5 belonging to the first
leg unit group G1 and the length of the support column 5 belonging
to the second leg unit group G2 have the same length. In this
condition, the top plate 2 is in a horizontal state. Here, the
length of the support column 5 belonging to the second leg unit
group G2 is maintained, but only the length of the support column 5
belonging to the first leg unit group G1 is changed, the attitude
of the top plate 2, as shown in FIG. 5B, is such that the height of
the side located on the support column 5 belonging to the first leg
unit group G1 is heigh, but the height of the other side located on
the support column 5 belonging to the second leg unit group G2 is
low. As a result, the top plate 2 is tilted indicated by the
tilting direction S. Since the foot body part 7 is fixedly mounted
on the support column 5, the top plate 2, when the support column 5
is tilted, the foot body part 7 is also tilted with the support
column 5. A foot portion 8a is attached to the foot body portion 7
so that the height of protrusion in the direction toward the floor
surface F (height direction) with respect to the foot body part 7
can be changed by an operation of the foot shaft 9a. Therefore,
even if the foot body portion 7 is tilted with the top plate 2, it
is possible to rest the foot portion 8a, 8b at the same time on the
floor surface F and the load of the table 2 can be transmitted to
the floor surface F. Foot portions 8a, 8b are connected to foot
shafts 9a, 9b respectively by ball joints 47 (FIG. 3C), so that the
angular deviation caused by the tilt of the top plate 2 is
absorbed. The overturning moment generated in the table 1 with the
tilt also is encountered against the endurance of foot parts 8a,
8b.
[0084] FIGS. 6A-6B are perspective views partially representing
another embodiment of the table of the present invention. FIG. 6A
is a perspective view representing the non-tilted state of one
support column of the table and its legs, and FIG. 6B is a
perspective view representing the tilted state of the table. In the
case that the leg structure of the table la is the leg structure 3a
consisting of four leg units U1 to U4 each disposed correspondingly
to the four corners, all of the support columns 5 and the foot
sections 6 have the same structure as shown in Figure. The foot
structure 3a of the table la shown in FIGS. 6A-6B has the structure
in which the lower end part 5b of the support column 5 (the lower
end part of the connecting cylinder 5c) is connected to the foot
body part 7 of the foot 6 at any angle only around the axis L1
parallel to the tilt axis in the tilt direction T (FIGS. 1A-1C).
Therefore, in this embodiment, the top plate 2 can be tilted as
shown in FIG. 6B only to the direction shown in S and the opposite
direction against it.
[0085] FIG. 7A-7B are explanatory views showing the connection
structure of a foot section and a support column of the leg
structure shown in FIGS. 6A-6B.
[0086] FIG. 7A is an explanatory view showing an example of the
connection structure of a support column 5 and a foot section 6 of
the leg structure 3a shown in FIGS. 6A-6B.
[0087] FIG. 7B is an explanatory view showing another example of
the connection structure of a support column 5 and a foot section 6
shown in FIGS. 6A-6B.
[0088] In FIG. 7A and FIG. 7B, I is a plan view of a support column
5 and a foot section 6 of leg structure 3a viewed from above, II is
a view showing three washers sandwiched between a support column 5
and a foot section 6 side-by-side, Ill is a side view showing I in
partial section, and IV is a view showing the sleeve used for the
side of a support column 5, and V is a view showing the attachment
bolts and washers used for the connection structure.
[0089] Referring to FIGS. 6A-6B and FIGS. 7A-7B, in the leg
structure 3a, an adapter 50 with a block shape is fixedly mounted
on the lower end portion 5b of the support column 5. The adapter 50
is located in a contact state with the side surface 7a of the foot
body portion 7, which faces the inside of the table, in this state
the adapter 50 is fixed to the foot body portion 7 by tightening
the threaded knob 51 (attachment bolt) in the direction of the axis
L. The foot body portion 7 is fixedly mounted with a nut 60 into
which the male screw of the knob 51 can screw, a sleeve 61 is
mounted in the adapter 50 in alignment with the nut 60 mounted on
the foot body portion 7. A lock washer assembly 62 is clamped
between the foot body portion 7 and the adapter 50. The washer
assembly 62 consists of three washers, that is, ring washers 63, 63
disposed on the side of the foot body portion 7 and on the side of
the adapter 50 and a spring washers 64 sandwiched between the ring
washers 63, 63. The spring washers 64 are formed in a C-shape and
formed by waving in the clamp-in direction. The threaded knob 51
comprises an outer threaded portion 65 and a knob portion 66. In
addition, the lower end portion 14 of the outer cylinder 11 of the
air spring is applied to the connecting cylinder 5c. The deformed
portion of the connecting cylinder 5c, which protrudes into the
cylinder as the embossing 68, is positioned in a position where the
lower end portion 14 of the outer cylinder 11 no longer descends by
abutting against the deformed portion. Alternatively, by bringing
the front end of the screwed-in set screw 69 into contact with the
lower end portion 14 of the outer cylinder 11 on the outside of the
connecting cylinder 5c of the support column 5, the outer cylinder
can also hold the outer cylinder 11 in place on the connecting
cylinder 5c.
[0090] The male threaded portion 65 of the knob 51 is made to pass
through the sleeve 61 and the washer assembly 62, and then the male
threaded portion 65 is screwed into the nut 60 in the foot body
portion 7, the support column 5 being attached to the foot body
portion 7. The male threaded portion 65 screwed into the nut 60 is
able to extend into the foot body 7. The screw can be loosed by
manipulating the knob 51, and the connection between the foot body
portion 7 and the adapter 50 is made free. When tightened with knob
51, the spring washer 64 elasticity prevents the screw from
loosening. Washer 67 is also inserted between the key portion 66 of
knob 51 and adapter 50, this structure ensures that the threads of
knob 51 with threads are securely tightened. The relative mounting
angle of the adapter 50 against the foot body portion 7 can be
changed depending on the tilt of the top plate 2. When the mounting
angle is determined, the knob 51 is screwed in by operation, and
the tilt angle of the support column 5 can be fixed and maintained
as shown in FIG. 6B. The attitude of the foot body part 7 does not
change relative to the ground F even if the tilt angle of the top
plate 2 changes, so that all the foot portions 8 set on the foot
body part 7 are in the state of correctly facing the ground F. The
male threaded portion 65 of the knob 51 may penetrate the foot body
portion 7, another nut can be tightened and fixed to the end of the
protruding male threaded portion 65, with this threading structure,
the support column 5 being securely fixed to the foot body portion
7.
[0091] The connection structure of the support column 5 and foot
section 6 shown in FIG. 7B is a connection structure, in which the
knob 51 with male threaded portion is directly threaded on the
connecting cylinder 5c of the support column 5, thereby the support
column 5 is connected with the foot body portion 7. In other words,
the foot body portion 7 is provided in the fixed manner with a nut
70, and a sleeve 71 is mounted in the lower part of the connecting
cylinder 5c in a penetrating state. A washer assembly 72 is
provided between the nut 70 and the lower part of the connecting
cylinder 5c for preventing slack. The washer set 72 is three sets
of washers such as with washer assembly 62 shown in FIG. 7A, and
consists of the ring washers 73, 73 and their C-shaped spring
washers 74 sandwiched between them. The knob 51 with screw as
attachment bolt has the same structure as knob 51 with screw shown
in FIG. 7A, but symbolized by male threaded portion 75 and knob
portion 76. In addition, washers 77 same as washer 67 are
intervened between the knob portion 76 of knob 51 with thread and
the support column 5.
[0092] The externally threaded portion 65 of the knob 51 passes
through the sleeve 71 and washer assembly 72 provided in a
penetrating state in the connecting cylinder 5c, and the externally
threaded portion 65 is screwed into the nut 70 secured to the foot
body portion 7, then the support column 5 is secured to the foot
body portion 7. The externally threaded portion 65 screws into the
nut 60 and can extend into the foot body portion 7. The connection
of the foot body portion 7 and the adapter 50 is made free by
loosening the screw by operating the knob 51. When tightening with
the knob 51, the spring washer 72 prevents loosening of the screw.
A washer 77 is also clamped between the knob portion 76 of the knob
51 and the support column 5 to ensure that the threaded knob 51
with threads is screwed. The mounting angle of the support column 5
relative to the foot body portion 7 can be changed according to the
inclination of the top plate 2 in the same manner as in the case of
the connection structure shown in FIG. 7A, so that the description
again is omitted. Also, the embossing 78 and fixing screw 79 formed
on the connecting cylinder 5c to fix the outer cylinder 11 of the
air spring are the same as those about the embossing 68 and fixing
screw 69 in FIG. 7A, so they are omitted.
[0093] FIGS. 8A-*B are views showing a further embodiment of the
table of the present invention. FIG. 8A is a perspective view
showing the whole of the further embodiment of the table according
to the present invention, and FIG. 8B is a perspective view showing
a part of the embodiment in an enlarged manner. In the table 1b
shown in FIGS. 8A-8B, the foot section 6 provided in the support
column 5 belonging to the first leg unit group G1 and the foot
section 6 provided in the support column 5 belonging to the second
leg unit group G2 (adjacent to the foot section 6 belonging to the
first leg unit group G1) are connected by the connecting member 55.
In this example the connecting member 55 includes an elongated
plate member 56 which is formed at both ends with long holes 57,57
extending in the long axis direction. The elongated plate member 56
is connected by butterfly bolts 58, 58 through the long holes 57,
57 into the foot body portions 7,7 of the foot sections 6, 6. In
the state where the butterfly bolt 58,58 are loosened, the
connecting member 55 can absorb, within the range allowed by the
long holes 57, 57, the variation in the spacing or rotation of the
two foot sections 6, 6 approaching and separating from each other
according to the inclination of the top plate 2. The first
operation unit 301 and the second operating unit 302, the foot
portions 8a, 8b are the same as those shown in FIGS. 1A-1C.
[0094] When the tilt angle of the top plate 2 is determined, by
screwing the butterfly bolt 58, 58 through the long hole 57, 57
into the foot body portion 7, 7 of the two leg unit groups G1, G2
in the state of the elongated plate member 56 being clamped against
the foot body portion 7, 7, the foot sections 6, 6 are connected by
the connecting member 56. In this connected state, the connecting
member 55 also suppresses the displacement of the foot section 6, 6
from shifting or twisting laterally with each other, so the
rigidity of the leg structure 3b can be improved and contributes to
stability. The elongated plate member 56 is shown as one member,
but the elongated plate member 56 can also be formed as a
connecting part consisting of two parts bolted to two foot sections
6, 6 respectively and overlapping each other with long holes.
[0095] In each of the above embodiments, both the first leg unit
group G1 and the second leg unit group G2 include two support
columns 5,5, but each group can simply include more than one
support column 5. However, one of the groups preferably includes
two support columns. Also, in the case of a large table, etc.,
either one or two support columns or even three support columns can
be included depending on the size and shape of the top plate 2.
FIG. 9 is a perspective view showing a further embodiment of the
table according to the present invention. In FIG. 9, the same
elements and parts as those shown in FIG. 2 are used with the same
symbols as those used in FIG. 2. FIG. 9 is a perspective view of
the table 1c shown in representing the table from the back side.
The first leg unit group G1 includes three leg units U1, U2 and U5
arranged in a row along the one side edge "a", the second leg unit
group G2 includes three leg units U3, U4 and U6 arranged in a row
along the other side edge "a". The leg unit U5 (U6) is located in
the middle position between the leg units U1, U2 (leg units U3,
U4). The operation units 301, 302 have, in order to operate the
corresponding the leg units U5, U6, the second rod portions 33c,
33c branching vertically in the direction of the center of the
table 1c from the central portions of the first rod portions 33a
and 33a of the rod sections 33, 33 and extending toward the
interior of the top plate receiving structures 4, 4 of the leg
units U5, U6. Each second rod portion 33c includes a lever pivot
portion 35 and an air spring operating portion 36 identical to the
other second rod portion 33b (also with reference to FIGS. 4A-4C).
Operating the operation unit 301, the leg units U1, U2, U5
belonging to the first leg unit group G1 operate simultaneously
(each support column 5 changes its length), and by operating the
operation unit 302, the leg units U3, U4, U6 belonging to the
second leg unit group G2 operate simultaneously (each support
column 5 changes its length). This embodiment is particularly
preferred in the case of a large table with a long lateral length
or a large load loaded on the table.
[0096] As explained above, the operation unit 30 is provided with a
structure such as a lever structure having a tip end portion 36
moved up and down by the lever action with the lever pivot portion
35 located in the middle position, the tip end portion 36 operating
to push down the push valve 16. In addition, as another structure
of the operating unit 30, the operating tip end portion with a
tapered surface is operated so that the tip end portion moves
forward and backward, that is, in and out of the inner part of the
top plate receiving structure. In this case, the push valve 16 is
operated by the wedge action of the tapered surface of the
operating tip end portion.
[0097] FIG. 10 is a perspective view showing a further embodiment
of the table according to the present invention. The table 1d shown
in FIG. 10 is provided, for example, with four support columns 5 in
a manner corresponding to the four corners of the top plate 2,
positioned to match each vertex of the rectangle, and two sets of
first operation units and second operation units are provided. That
is, the first leg unit group G1(i) and the second leg unit group
G2(i) as one group of the leg unit groups are arranged along the
long side edges "a", "a" of the top plate 2, as in the case of the
first leg unit group G1 and the second leg unit group G2 in the
embodiment shown in FIG. 2. From the same four leg units U1 to U4,
another group of the leg unit groups is defined which includes the
first leg unit group G1(ii) and the second leg unit group G2(ii)
arranged along the short side edges "b", "b" of the top plate 2.
The four leg units U1 to U4 are shown as examples occupying
positions consistent with the four respective vertices of the
rectangle, but the top plate 2 can be a parallelogram. Even though
configured in a position consistent with those four respective
vertices, the tilt directions, although not at orthogonal angles to
each other, will give the same effect.
[0098] With respect to the operation units, one set of the first
operation unit 301(i) and the second operation unit 302(i), like
the first operation unit and second operation unit 301, 302 in the
embodiment shown in FIG. 2, are arranged along the long side edges
"a", "a", but the first operation unit 301(ii) and the second
operation unit 302(ii) of another set of the operation units are
arranged along the short side edges "b", "b" of the top plate 2.
The structure of the first operation unit 301(ii) and the second
operation unit 302(ii) of the other set of the operation units is
the same structure of the first operation unit 302(i) and the
second operation unit 302(i) of the one set of the operation units,
except that the lengths of the units are different, so the
description is again omitted. By operating another set of first
operation unit 301(ii) and second operation unit 302(ii), the top
plate 2 can be tilted in the tilt direction S(ii) orthogonal to the
tilt direction S(i) while operating the one set of the first
operation section 301(i) and the second operation section 302(i).
Regarding the top plate receiving structure 4a used in this
embodiment, it will be described later with reference to FIG.
11.
[0099] FIG. 11 is a perspective view of the operating unit and the
top plate receiving structure in the embodiment shown in FIG. 10.
In the top plate receiving structure 4a shown in FIG. 11, there are
longitudinal long holes 25,25 in the side wall portions 22,22 on
both sides of the pinch angle. A second rod portion 33b of the
first operating unit 301(i) of the one set of the units and a
second rod portion 33b of the second operating unit 302(ii) of the
other set of units pass through the long holes 25, 25 and into the
central concave portion 21 of the top plate receiving structure 4a.
The lower edge portions of the long hole 25,25 are lever pivot
portions 35,35. When operating the first operating unit 301(i) of
the one set of the units and second operating unit 302(ii) of the
other set of the units, the second rod portions 33b, 33b operate by
the lever action of the lever pivot portions 35,35 to cause the air
spring operating portions 36,36 formed on the tip end portions of
the second rod portions 33b, 33b to act in the up and down
direction. The air spring operating portions 36,36 overlap up and
down each other on the push valve 16 in the concave portion 21.
[0100] When only the first operation unit 301(i) is operated, the
air spring operating portion 36 formed at the tip end of the second
rod portion 33b of the first operation unit 301(i) directly pushes
the push valve 16 in, causing the air spring to act. When the
second operation unit 302(ii) is operated, the air spring operating
portion 36 formed at the tip end of the second rod portion 33b of
the second operating unit 302(ii) pushes the air spring operating
portion 36 of the first operating unit 301(i), thereby the air
spring operating portion 36 of this first operating unit 301(i)
presses the push valve 16, causing the air spring to act. Regarding
the other components of the top plate receiving structure 4a, since
the structure is the same as that of the top plate supporting
structure 4 shown in FIGS. 4A-4C, the same symbols are used and the
description is omitted.
[0101] FIGS. 12A-12D are explanatory views showing the rotational
configuration of the foot section of the leg unit of the table
according to the present invention. Since the support column 5 of
the structure has a circular cross section, the support column 5 is
mounted on the foot body portion 7 of the foot section 6. However,
it is easy to change the angle around the axis of the support
column 5 for mounting. The direction in which the foot body portion
7 of the foot section 6 extends is changeable, corresponding to the
combination of the set to be operated of the first leg unit and the
second leg unit and the tilt direction of the top plate 2, by
adopting, for example, a structure in which protrusions and concave
parts embedded with the protrusion are formed in 90 degrees around
the axis of the support column 5, or the bottom of support column 5
is fixed with screws at each 90 degrees. Taking FIG. 12A as the
basic shape, assuming that one set of the first leg unit group and
the second leg unit group is arranged the long side edge "a" of the
top plate 2, the inclination (downward) direction S of the top
plate 2 produced by the operation is from the position of the foot
portions 8a, 8b toward the lower side of the figure surface.
[0102] FIG. 12B shows the state in which the foot body portion 7 is
rotated 180 degrees from the configuration of FIG. 12A. The first
support column group and the second support column group being
operated are unchanged from the basic shape, but the top plate 2 is
tilted in the opposite direction, and the tilting (downward)
direction S is toward the direction of the face side of the figure.
FIG. 12C shows the state in which the foot body portion 7 is
rotated 90 degrees clockwise from the configuration shown in FIG.
12A. The tilt (downward) direction S in this state is in the
direction toward the left side of the figure face based on the
position of the foot portions 8a, 8b. The set of the first leg unit
and the second leg unit to be operated is different from the set in
the case of the basic form (another set along the short side edges
"b","b"). FIG. 12D shows the state in which the foot body portion 7
is rotated clockwise starting from the configuration of FIG. 12A,
indicating a rotation of 270 degrees. The tilt (downward) direction
S in this state is the direction toward the right side of the
figure based on the position of the foot portions 8a, 8b. The set
of the first leg unit and the second leg unit is same as that of
FIG. 12C (the other set along the short side edges "b", "b"), but
tilted in the opposite direction of operation. In any case, the
foot body portion 7 is within the projection of the top plate 2
toward the ground F, and does not protrude beyond the projection of
the top plate 2, it does not interfere with operators moving
around.
[0103] FIGS. 13A-13B are schematic diagrams showing the embodiment
of the table according to the present invention, applied to a table
with laterally long shape, and when looking from a foot body
portion toward the top plate. Table le shown in FIG. 13A is, for
example, a table of a top plate 2 that is laterally very long (long
side edges "a", "a" is sufficiently longer than short side edges
"b", "b"). Since the leg structure 3 including the support column
and foot section is the same as the structure shown in FIGS. 3A-3C
and FIGS. 12A-12D, a detailed description is omitted here. Table 1e
has so long lateral length that one person cannot operate two
operating sections 30, 30 arranged along the short side edges "b",
"b" at the same time. However, two people can share and operate
these operating sections 30, 30 and change the length of the
support columns of the first leg unit group G1 and the second leg
unit group G2 along the short side edges "b", "b". The height of
the top plate 2 is adjusted in the case where the lengths of the
changed support columns of the two leg unit groups G1, G2 are the
same, in case differently adjusted, the height is changed and
tilted in the tilt direction (lateral) S. The operation units 30,30
may be arranged along the long side edges "a","a" as shown in the
table 1f in FIG. 13B. In the table 1f, except for the configuration
of the operation unit 30,30 and the leg units G1, G2, the same
symbols are given to the same structure as in the table 1e so that
the description again is omitted. In the case of the table 1f, it
is possible for one person to operate two operation units 30,30,
with the tilt direction S being longitudinal.
[0104] FIGS. 14A-14B are schematic diagrams showing other
embodiments of the table according to the present invention. The
table 1g shown in FIG. 14A has a top plate 2b in the shape of a
circular. As the leg structure, the first and second leg unit
groups and the leg units, the same structure or unit can be used as
that used for the leg structure 3, the first and second leg unit
groups G1,G2 and leg units U1 to U4 as shown in FIGS. 1A-1C and so
forth. The shape of the top plate 2b may be an L-shaped top plate,
as shown in the table 1h in FIG. 14B. In this case, the first and
second leg unit groups G1 and G2 of the leg structure can be
arranged so as to cross an L-shape diagonally. The lengths of the
first and second leg unit groups G1 and G2 along the table surface
(length of the operation section 30) are of different lengths, but
the leg units U1 to U4 can be of the same structure. Not only to
the L-shaped table, the same leg structure can be used for
half-circle tables, quarter-circle tables, even for fan-shaped
tables.
[0105] Above, for the tiltable table of the present invention,
several examples are listed for illustration, but various
variations are optional. For example, the seating body 8c of the
foot portion 8 may be a caster in order to be able to move on the
floor surface F, or a caster with a rotation stop locking function.
The top plate, although illustrated as a flat plate, can take
various forms depending on the application. For example, the
present table can be applied to an arbitrary lifting platform such
as a bed or sofa where the top plate is a supporting base for a
cushion or a pad.
[0106] In addition, the table according to the present invention is
applicable to tables in general, such as a stove, a steering rack,
a line stand, store stand, display table, study table, etc., which
has a horizontal or nearly horizontal surface for placing items
thereon and for operator's working while standing or sitting
nearby, and has a function necessary for the up and down movement
of the top plate.
DESCRIPTION OF THE SYMBOLS
[0107] 1, 1a, 1b, 1c, 1d, 1e, 1f, 1g, h table [0108] 2, 2a, 2b top
plate [0109] 3, 3a, 3b leg unit structure [0110] 4, 4a top plate
receiving structure [0111] 5 support column 5a upper end portion 5b
lower end portion [0112] 6 foot section [0113] 7 foot body portion
[0114] 7a side [0115] 8(8a, 8b)8c seating body [0116] 9 leg shaft
9a long leg shaft 9b short leg shaft [0117] 10, 10a foot connector
[0118] 11 inner cylinder [0119] 12 outer cylinder [0120] 13 air
spring [0121] 14 lower end section of outer cylinder 11 [0122] 15
upper end section of inner cylinder 12 [0123] 16 push valve [0124]
17, 17a locking structure [0125] 21 central recess [0126] 22 side
wall section [0127] 23 bottom wall section (bottom) [0128] 24
fastener(fixing member) [0129] 25 long hole [0130] 26 flange part
[0131] 30(30a,30b) operation unit [0132] 31 handle portion [0133]
301, 301(i), 301(i) first operation unit [0134] 302, 302(i), 302(i)
second operation unit [0135] 32 operating rod section [0136] 33
operating rod section [0137] 33a first rod portion [0138] 33b
second rod portion [0139] 34 connector [0140] 34a, 34a hole [0141]
34b, 34b screw hole [0142] 35 lever pivot portion [0143] 36 air
spring operating portion [0144] 40 screw shaft [0145] 41, 42 nut
[0146] 43, 44 washer [0147] 45 screw shaft [0148] 46 screw hole
[0149] 47 ball joints [0150] 50 adaptor [0151] 51 knob [0152] 56
elongated plate member [0153] 57 long hole [0154] 58 butterfly bolt
[0155] 60, 70 nut [0156] 61, 71 sleeve [0157] 62, 72 group of
washers [0158] 63, 73 circular washer(washer) [0159] 64, 74 spring
washer [0160] 65, 75 external thread part [0161] 66 key portion
[0162] 67, 77 washer [0163] 68, 78 embossing [0164] 69, 79 fixed
screws [0165] 68 long axis [0166] 76 knob portion [0167] S, S(i),
S(ii) tilt direction T optimum tilt direction [0168] F floor [0169]
L horizontal centerline [0170] L1 axis [0171] G1, G1(i), G1(ii)
first leg unit group [0172] G2, G2(i), G2(ii) second leg unit group
[0173] 6G1 first foot section group [0174] 6G2 second foot section
group [0175] U1, U2, U3, U4, U5, U6 leg unit [0176] P1 first
support column configuration plane [0177] P2 second support column
configuration plan
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