U.S. patent application number 11/761569 was filed with the patent office on 2007-10-04 for telescopic legs and tables.
Invention is credited to James E. Doyle.
Application Number | 20070228234 11/761569 |
Document ID | / |
Family ID | 32685319 |
Filed Date | 2007-10-04 |
United States Patent
Application |
20070228234 |
Kind Code |
A1 |
Doyle; James E. |
October 4, 2007 |
TELESCOPIC LEGS AND TABLES
Abstract
A telescopic leg has a housing with a lift cylinder or
mechanical screw jack type lift and an external track for
adjustably coupling to a member. Such telescopic legs can be used
to define a variety of table base configurations by providing
multiple angularly aligned tracks in each leg for receiving cross
supports which can be selectively coupled to a desired location
along the tracks.
Inventors: |
Doyle; James E.;
(Grandville, MI) |
Correspondence
Address: |
PRICE HENEVELD COOPER DEWITT & LITTON, LLP
695 KENMOOR, S.E.
P O BOX 2567
GRAND RAPIDS
MI
49501
US
|
Family ID: |
32685319 |
Appl. No.: |
11/761569 |
Filed: |
June 12, 2007 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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10738806 |
Dec 17, 2003 |
7246779 |
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11761569 |
Jun 12, 2007 |
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60434527 |
Dec 18, 2002 |
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Current U.S.
Class: |
248/188.5 |
Current CPC
Class: |
F16B 7/14 20130101; A47B
91/00 20130101; F16M 11/32 20130101; F16M 11/18 20130101; A47B 9/04
20130101; F16B 7/187 20130101; F16M 11/28 20130101; A47B 9/10
20130101 |
Class at
Publication: |
248/188.5 |
International
Class: |
F16M 11/26 20060101
F16M011/26 |
Claims
1. A telescopic leg comprising: an elongated leg defined by a
housing having a generally cylindrical bore for receiving a lift
member therein, at least one elongated track integrally formed in
said housing externally to said bore, said track extending in
parallel spaced relationship to the axis of said cylindrical bore
and adapted to receive a fastener for coupling said leg to another
member at a selected location along said track; and a
piston-actuated lift member mounted in said bore.
2. The telescopic leg as defined in claim 1 wherein said track is a
generally T-shaped slot.
3. The telescopic leg as defined in claim 1 wherein said leg
includes at least two elongated tracks extending in angular
relationship with respect to each other and each including a
generally T-shaped slot facing outwardly from the axis of the
bore.
4. The telescopic leg as defined in claim 2 wherein said lift
member is a hydraulic lift.
5. The telescopic leg as defined in claim 2 wherein said lift
member is a screw jack.
6. The telescopic leg as defined in claim 1 wherein said leg is
extruded.
7. The telescopic leg as defined in claim 6 wherein said leg is
extruded of an aluminum material.
8. The telescopic leg as defined in claim 1 wherein said track is a
T-shaped slot adapted to receive a T-shaped nut and wherein said
leg includes a pin extending across said slot at a predetermined
location to limit the motion of said nut in said slot.
9. A telescopic leg comprising: an elongated stationery leg defined
by an extruded housing having an upper end and a lower end, wherein
said lower end of said housing has an opening, said housing also
including a generally cylindrical bore for receiving a lift member
therein; said housing further including at least one elongated
track integrally formed in said housing externally to said bore,
said track extending in parallel spaced relationship to the axis of
said cylindrical bore and facing outwardly for receiving a fastener
for coupling said leg to another member at a selectable location
along said track; a lift member mounted in fixed relationship
within said housing, said lift member including a piston actuated
cylinder including a piston rod and a leg coupled to said piston
rod for extending outwardly from said bore through said opening at
said lower end of said housing, said lift member further including
a mounting head at an end opposite said leg; and a coupling member
extending between said mounting head of said lift member and said
housing for securing said lift member within said bore.
10. The telescopic leg as defined in claim 9 wherein said coupling
member is a snap ring.
11. The telescopic leg as defined in claim 10 wherein said track is
a generally T-shaped slot.
12. The telescopic leg as defined in claim 9 wherein said track is
a T-shaped slot adapted to receive a T-shaped nut and wherein said
leg includes a pin extending across said slot at a predetermined
location to limit the motion of said nut in said slot.
13. A telescopic leg comprising: an elongated leg defined by an
extruded housing having an upper end and a lower end, said housing
including a generally cylindrical bore for receiving a lift member
therein; said housing further including at least one elongated
track integrally formed in said housing externally to said bore,
said track extending in parallel spaced relationship to the axis of
said cylindrical bore and facing outwardly for receiving a fastener
for coupling said leg to another member at a selectable location
along said track; a lift member including a piston actuated
cylinder mounted within said bore, said lift member including a
piston rod and a leg coupled to said piston rod for extending
outwardly from said bore at said lower end of said housing, said
lift member further including a mounting head at an end opposite
said leg; a snap ring coupled to said upper end of said housing and
to said mounting head of said lift member for securing said lift
member within said bore; and a cylindrical bushing extending
between said bore and said leg at said lower end of said
housing.
14. The telescopic leg as defined in claim 13 wherein said track is
a T-shaped slot adapted to receive a T-shaped nut and wherein said
leg includes a pin extending across said slot at a predetermined
location to limit the motion of said nut in said slot.
15. The telescopic leg as defined in claim 13 and further including
a glide adapter coupled to a lower end of said leg and to an end of
said piston rod.
16. The telescopic leg as defined in claim 15 and further including
a glide adjustably coupled to said glide adapter.
17. The telescopic leg as defined in claim 13 wherein said lift
member is a hydraulic lift.
18. The telescopic leg as defined in claim 13 wherein said housing
is extruded of an aluminum material
19. The telescopic leg as defined in claim 13 wherein said housing
includes at least two elongated tracks extending in angular
relationship with respect to each other and each including a
generally T-shaped slot facing outwardly from the axis of said
bore.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. patent
application Ser. No. 10/738,806 filed on Dec. 17, 2003, entitled
TELESCOPIC LEGS AND TABLES, now U.S. Pat. No. ______, which claimed
priority under 35 U.S.C. .sctn. 119(e) to U.S. Provisional
Application No. 60/434,527, entitled TABLE WITH ADJUSTABLE LEGS,
filed on Dec. 18, 2002, by James E. Doyle, the entire disclosures
of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] The present invention relates to an extruded leg which
integrally includes a lift cylinder and at least one slotted track
for adjustably receiving one or more struts to provide a system for
manufacturing height adjustable objects, such as tables in
selectable configurations.
[0003] Telescopic table legs are commonly used in work places for
adjusting work surface heights for a variety of uses, such as
positioning the work surface for standing or various sitting
positions. Electrically driven linear actuators are frequently
employed to control the height of tables having telescopic legs. A
few such proposals are disclosed in U.S. Pat. Nos. 5,553,550,
6,352,037, 6,360,675, 6,435,048, 6,494,005, and published
application U.S. Ser. No. 09/870,091 (Publication No. 2002/0074477
A1). These systems each employ dedicated leg designs which allow
use of an actuator for raising the table of a given configuration
between different height adjusted levels. Likewise, pending U.S.
patent application entitled ADJUSTABLE TABLE ASSEMBLY, Ser. No.
10/218,650, filed Aug. 14, 2002, discloses a table with adjustable
height but one which has a specific configuration.
[0004] There are several extruded aluminum strut systems which
allow different table configurations to be fabricated from
universal extruded members, such as provided by Bosch Automation,
Parker Hannifin Corporation, and others. Such tables, which can be
configured in a variety of shapes and sizes, once constructed, are
not adjustable without reassembly. In the past, in order to
vertically adjust such tables, lift cylinders have been secured to
the legs of the tables by drilling holes through the legs and
extending fasteners through the legs and into threaded apertures in
the lift cylinder housing for mounting the cylinders on the side of
the legs. Although such construction provides adjustable table
heights for a table configuration utilizing the extruded members,
the mounting of such lift cylinders is somewhat difficult,
requiring drilling of holes through the table legs. Once mounted,
the lift cylinder cannot be vertically adjusted.
[0005] There exists a need, therefore, for an improved system which
allows the telescopic height adjustment of tables and construction
of tables with different configurations, including different sizes,
dimensions, and shapes and which provides a greater adjustment
flexibility.
SUMMARY OF THE INVENTION
[0006] The telescopic leg assembly of the present invention
integrates a lift cylinder actuator and an extruded leg having at
least one elongated track for receiving struts which can be used to
define a support base for a variety of adjustable members. In a
preferred embodiment, the actuator includes a housing which defines
one or more elongated tracks in the form of slots for receiving
fasteners for cross-members defining a table support structure. In
one embodiment of the invention, a lift cylinder housing includes a
single longitudinally extending extruded track defining a T-shaped
slot for receiving a fastener nut and threaded fastener coupled to
a cross member without the need for threaded apertures in the
actuator housing. In another embodiment of the invention, the lift
cylinder integrally includes two or more tracks which may be
elongated T-shaped slots arranged in angular relationship to define
corner legs, intermediate legs, or angularly related legs for a
variety of table base configurations. In all embodiments of the
present invention, a lift cylinder housing is provided with at
least one elongated track such that a lift cylinder is integrated
within the leg so-formed, which can be attached to a support member
to provide vertical adjustment thereto.
[0007] These and other features, objects and advantages of the
present invention will become apparent upon reading the following
description thereof together with reference to the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] FIG. 1 is a perspective exploded view of a telescopic leg of
the present invention including a lift cylinder and housing with an
elongated track;
[0009] FIG. 2 is an enlarged top plan view of the structure shown
in FIG. 1;
[0010] FIG. 3 is a view of the structure shown in FIG. 2 with a
member attached thereto;
[0011] FIG. 4 is a vertical cross-sectional view, partly broken
away, of the telescopic leg shown in FIG. 1;
[0012] FIG. 5 is a greatly enlarged fragmentary vertical
cross-sectional view of the lower end of the leg shown in FIG.
4;
[0013] FIG. 6 is a greatly enlarged fragmentary cross-sectional
view of the upper section of the leg shown in FIG. 4;
[0014] FIG. 7 is a cross-sectional view taken through section lines
VII-VII of FIG. 6;
[0015] FIG. 8 is a perspective view of a table base incorporating
telescopic legs embodying the present invention;
[0016] FIG. 9 is an enlarged top plan view of an extrusion forming
one of the legs of FIG. 8, shown without the lift cylinder mounted
therein;
[0017] FIG. 10 is a perspective view of one of the legs employed in
the table frame shown in FIG. 8;
[0018] FIG. 11 is a top plan view, partly broken away and in
phantom, of a table employing the frame shown in FIG. 8;
[0019] FIG. 12 is an elongated fragmentary top plan view, partly
broken away and partly in cross section, of one of the corner
connections of the table base of FIG. 11;
[0020] FIG. 13 is a perspective view of a table employing the frame
shown in FIG. 8;
[0021] FIG. 14 is a front elevational view of the leg shown in FIG.
10;
[0022] FIG. 15 is a rear elevational view of the leg shown in FIG.
13;
[0023] FIG. 16 is a vertical cross-sectional view of the leg shown
in FIGS. 10, 14, and 15;
[0024] FIG. 17 is a top plan view of the leg shown in FIG. 16;
[0025] FIG. 18 is a cross-sectional view of the table leg shown in
FIG. 16, taken along section line XVIII-XVIII of FIG. 16;
[0026] FIG. 19 is an enlarged fragmentary cross-sectional view of
the lower section of the leg shown in FIG. 16;
[0027] FIG. 20 is an enlarged fragmentary cross-sectional view of
the upper section of the leg shown in FIG. 16;
[0028] FIG. 21 is a fragmentary top plan view of a table frame
incorporating a telescopic center support leg;
[0029] FIG. 22 is a perspective view of the telescopic center
support leg;
[0030] FIG. 23 is an enlarged top plan view of the leg shown in
FIG. 22;
[0031] FIG. 24 is a top plan view of a generally triangular table
frame using telescopic legs embodying the present invention;
and
[0032] FIG. 25 is a top plan view of another triangular table frame
using telescopic legs embodying the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0033] Turning initially to the first embodiment of the invention
shown in FIGS. 1-7, there is shown a telescopic leg 10 embodying
the present invention, which includes a lift cylinder 12 which
includes an outer housing 14 that is integrally extruded of metal,
such as aluminum or an aluminum alloy. The lift cylinder includes
an inner telescopic leg 16 having an adjustable foot or glide 18
secured to the lower end thereof in a conventional manner. The
housing 14 includes an inner cylindrical bore 20 (FIG. 4) for
receiving cylindrical telescopic leg 16 which, as best seen in
FIGS. 4-6, is coupled by a seal cap 23 and glide adapter 25 to the
lower end of piston rod 22. The upper end of rod 22 is coupled to
the piston 24 of a hydraulic cylinder 27, which is positioned
within bore 20 and coaxially within cylindrical leg 16. Pressure is
applied to the piston rod 24 through a connecting head 28 to which
fluid pressure is selectively applied from an external supply of
pressurized fluid such as pneumatic or hydraulic pressure to extend
leg 16 from a collapsed position within housing 14, as seen in FIG.
4, to an extended position, as shown in FIG. 1, and positions
therebetween. The details of the lift cylinder itself, as also
shown in FIGS. 5 and 6, are described in greater detail in U.S.
Pat. No. 6,711,985, which issued march 30, 2004, the disclosure of
which is incorporated herein by reference.
[0034] The end of barbed piston rod 22 is pressed into a central
aperture 13 in seal cap 23, which is snap-fitted by flanges 19
(FIG. 5) to an annular shoulder 17 in the glide adapter 25. An
O-ring 15 seals cap 23 to glide adapter 25. An adjustable glide 18
is threadably extended into the glide adapter 25, as seen in FIG.
5. The glide adapter is secured to leg 16 by a crimp connection 11
(FIG. 5) and includes a lower O-ring seal 26.
[0035] Piston 24 rides along the cylindrical internal diameter of
piston cylinder 27, which is coupled to a connecting head 28 which,
in turn, is concentrically mounted within bore 20 near the top of
housing 14. A cylindrical guide bushing 21 extends between the
outer diameter of leg 16 and the inner cylindrical bore 20 of
housing 14, as best seen in FIGS. 4 and 5. Fluid pressure to the
lift cylinder integrally formed in leg 10 is applied through a
threaded fitting 33 in connecting head 28 by a conventional fluid
coupling extending through an aperture 35 in a cover cap 29
snap-fitted within the top of housing 14, as best seen in FIGS. 2-4
and 6. A snap-ring 31 (FIGS. 6 and 7) fixedly secures the
connecting head 28 within the bore 20 of cylindrical housing 14
against an annular shoulder and seal 37 (FIG. 6).
[0036] Extruded housing 14 integrally includes an external
vertically extending elongated track 30 which includes a T-shaped
slot 32 extending longitudinally along substantially the length of
housing 14 to slidably and adjustably receive threaded T-shaped
locking nuts 34 and 36 (FIGS. 1 and 3) for coupling a support
member, such as member 40 shown in FIG. 3, to the T-shaped nut 34
positioned within slot 32 of track 30 by means of fastening screws
42. Typically, a pair of T-shaped nuts 34, 36 will be mounted in
spaced relationship to a member 40, such as a cross beam, to secure
the crossbeam in an adjustable position along the vertically
extending length of track 30. A pin 9 (FIGS. 1, 2, 4, 5, and 7) is
press-fit in apertures in track 30 and extends across the slot 32
at the lower end of track 30 to provide a reference location for
the lowermost T-nut 36. The predetermined location of pin 9 is
typically near the lower end of slot 32. Thus, when several legs 10
are mounted to objects, they can be vertically aligned by extending
the fastening screws 42 through apertures in the objects at the
same level. The pin 9 also serves as a stop to prevent T-shaped nut
36 from sliding from the slot 32.
[0037] The telescopic leg 10 so defined can be coupled to a member
40 in a variety of applications to provide an adjustable support
leg. Leg 10 can be employed in applications other than table leg
configurations to provide a vertically adjustable connection to a
member 40 in a number of environments which allow member 40 to be
adjustably positioned along the vertical length of slot 32 in
housing 14 of the telescopic leg as well as subsequently adjusted
by the extension of telescopic leg 16 within leg 10.
[0038] A specific rectangular table configuration employing the
system of the present invention is now described in connection with
FIGS. 8-20, which show in FIGS. 8, 11, and 13 a table 50 (FIG. 13)
with a top 52 supported on a base 60 (FIGS. 8 and 11). The base
includes four telescopic legs 100 and cross members 61-68 extending
between and adjustably coupled to the legs. Components of legs 100,
which are similar to the components of leg 10, are identified by
similar reference numerals preceded by the reference number "1".
Table base 60 includes four identical telescopic legs 100 in each
of the corners of the rectangular table which legs, as seen in
FIGS. 9 and 10, each include an extruded housing 114 having a
telescopic leg 116 (FIG. 16) extendable therefrom. Fluid pressure
is applied to the pistons 124 of each of the legs through a
connecting head 128, which is supplied fluid pressure through
threaded connection 133 and a fluid conduit (not shown) extending
through a grommet 135 extending in one of the side walls 101 of leg
100. Leg 100 is generally triangular in shape with walls 102, 105,
and 107, although it includes six specific walls including wall
101, an opposed wall 102 which may include a serrated decorative
surface 103 (as seen in FIGS. 9 and 10), which is exposed to the
outer corners of table 50 to provide a decorative finish to the
legs 100. Each of the extruded legs 100 include two side walls 105
and 107 extending at 45.degree. angles to wall 101 and which
include integrally formed vertically extending elongated T-shaped
slots 132 for receiving T-shaped mounting nuts, such as nuts 34 and
36 shown in FIG. 1 in a similar manner as described below.
[0039] Housing 114 for legs 100 also includes a pair of integrally
formed sides 106 and 108 joining sides 105 to 102 and 107 to 102,
respectively at 45.degree. angles to complete the outer periphery
of the extruded aluminum or aluminum alloy housing 114 of the leg
100. Housing 114 includes a cylindrical center bore 120 defining
the inner cylindrical wall of the telescopic leg assembly so
formed, as seen in FIGS. 16, 19, and 20. Thus, the integral leg 100
shown in FIGS. 8-20 is formed with a telescopic extension leg and
includes two right angle related mounting tracks defining T-shaped
extruded slots 132 extending the length of the outer housing 114
defining each of the four legs of table frame 60. Frame 60 includes
lower and upper cross members 61-68 having ends coupled to each of
the legs 100, as seen in FIG. 12, by means of conventional right
angled corner brackets 70 and fastening screws 142 extending
through an aperture in an end wall 72 of each of the corner
brackets 70 into legs 100 and through a floor 74 of the brackets 70
(FIG. 12) into cross members 61-68 using T-shaped nuts 34
positioned in alignment in T-shaped slots. Each of the corner
brackets 70 include a vertical wall 72 and a floor 74 through which
the fasteners 142 extend. Each of the cross members 61-68 include
T-shaped slots 69 which receive T-shaped nuts in a conventional
manner for securing the floor of each corner bracket to each cross
member 61-68 while the vertical wall 72 of each corner bracket 70
is secured to a leg 100 by mounting a T-shaped nut 34 into slot 132
and using a fastener 42, as best seen in FIG. 12. Brackets 70 are
conventional, commercially available members which include
reinforcing sides 71 and 73 for added strength.
[0040] As can be appreciated, the design of table base 60 can be
any particular shape depending upon the length of the opposed
facing cross members. It can be a square table, a narrow
rectangular table, or a wide rectangular table, as desired. The
adjustable height of the table is selected by the length of the
housing 114 and the extension of telescopic leg 116 carried
therein, such that a table having a shape, size, and adjustable
height to conform to a desired work place or other environment can
be provided. The upper end of table legs 100 are enclosed by a cap
131 (FIGS. 8, 14, and 15), which together with base 60 can include
suitable structure for mounting a tabletop 52 thereto, as seen in
FIG. 13. Telescopic leg 116 is secured to housing 114 by the
coupling of head 128 (FIGS. 16-18 and 20) to cap 131 by the use of
a snap ring 129 which is fitted within an annular recess in the
head 128. Ring 129 engages the upper side of shoulder 126 in cap
131 with the lower side of shoulder 126 being engaged by a shoulder
126 on the head 128, as best seen in FIG. 20. Cap 131 is
subsequently secured to housing 114 by screws 115 (FIG. 17), which
extend within sockets 113 (FIGS. 9 and 18), which secures
telescopic leg 116 in cylindrical bore 120 of the housing 114. The
lower end of the housing includes an annular bushing 121 (FIG. 19)
for guiding the telescopic leg 116 within bore 120 during extension
and retraction of the leg. Telescopic leg 116 is coupled to the
piston rod 122 of the lift member by the glide adapter 125 (FIG.
19) such that actuation of the hydraulic cylinder 127, which moves
piston 124 and rod 122, results in the extension and retraction of
the telescopic leg 116. A glide 118 is threadably secured to the
glide adapter 123 (FIG. 19) at the lower end of leg 100. The inner
surfaces of walls 101, 106, and 108 [m] include sockets 113 (FIGS.
9, 10 and 18) for receiving self-threading screws 115 to secure
table-supporting hardware thereto or for securing caps 131 to the
top of the table legs 100 so formed. The internal components and
height adjustable function of legs 100 are substantially identical
in operation to leg 10 shown in FIGS. 1-7 and described above, so
no additional description is necessary.
[0041] Relatively large tables, such as shown in fragmentary view
in FIG. 21, may require a center support leg 200, which is also
illustrated in FIG. 22 and which similarly includes an extruded
housing 214 with an integral central cylindrical bore 220 for
receiving an adjustable leg 216 therein in the same manner as the
previous embodiments. Housing 214, however, includes two
180.degree. opposed slots 232 and a third intermediate slot 232'
which extends orthogonally between slots 232 such that a cross
support 269 can be fitted in the orthogonally extending slot 232
using T-shaped nuts and a corner bracket 70. Thus, by the use of
the table legs 100 and 200, shown in FIGS. 21 and 22, a
significantly larger table base 260 can be formed utilizing two
such center support telescopic legs in conjunction with four corner
legs 100 to form the base of a table. Suitable upper and lower
cross supports intercouple legs 100 and legs 200 to legs 100, as
illustrated in FIG. 21, and are secured to the associated legs in
the manner illustrated and described in connection with FIG.
12.
[0042] Other table configurations can be provided, such as
triangular tables (shown in FIGS. 24 and 25). In FIG. 24, a base
360 for a triangular table includes three table legs 300, which
each include a pair of T-shaped slots 332 positioned at 60.degree.
angles for defining a particular equilateral shaped triangular
table top as shown. Equal length upper and lower cross supports
301, 302, and 303 are coupled to the legs 300 in the same manner as
illustrated in FIG. 12. Legs 300, like legs 10, 100, and 200, have
an extruded housing 314 with a cylindrical bore and telescopic leg
coupled to glides 318 for providing an adjustable height table.
[0043] Another triangular shaped base 460 can be made with one leg
400 (FIG. 25) having two 90.degree. spaced tracks and two legs 410
with 45.degree. spaced tracks to define a right angled triangular
table base 460 suitable for positioning in a corner of a room. Legs
400 and 410 are otherwise constructed in the same manner as in the
previously described embodiments.
[0044] As can be appreciated, the adjustable legs of the present
invention thus provide an integral telescopically adjustable leg
with at least one elongated mounting track. In one preferred
embodiment, multiple tracks in the form of slots can be angularly
related in any desired configuration to provide differently
configured table bases to provide adjustable table supports for a
variety of table configurations. Although the preferred embodiment
disclosed employs fluid-actuated cylinders for the telescopic
extension of the adjustable legs, in some embodiments it may be
desirable to utilize mechanical screw-jack type manual or
motor-driven adjustable telescopic legs, such as disclosed in U.S.
Pat. No. 6,595,144, the disclosure of which is incorporated herein
by reference. Such legs also would integrally include an extruded
housing having T-shaped or other configured slots for receiving
cross members for defining table bases of different configurations.
Also, the track(s) extending along the outer surface of the
telescopic leg can take on other forms and may, for example, be
T-shaped projections for receiving a T-shaped slot in a mating
member that includes a suitable locking fastener.
[0045] These and other modifications to the preferred embodiment of
the invention will become apparent to those skilled in the art and
will fall within the spirit and scope of the invention as defined
by the appended claims.
* * * * *