U.S. patent number 3,927,918 [Application Number 05/397,784] was granted by the patent office on 1975-12-23 for slide assembly.
This patent grant is currently assigned to Janet E. Dobbratz. Invention is credited to Edward J. Dobbratz.
United States Patent |
3,927,918 |
Dobbratz |
December 23, 1975 |
**Please see images for:
( Certificate of Correction ) ** |
Slide assembly
Abstract
A slide assembly having particular use for extension tables. The
slide assembly includes a series of slide members disposed in
interconnected side-by-side relation, with each slide member
adapted to move relative to the adjacent slide member between a
retracted and extended position. The side surfaces of the slide
members are provided with longitudinal female dovetail grooves and
blocks having mating male dovetail portions, are secured to one
slide member and fireely slidable within the groove of the adjacent
slide member. Each block has thin longitudinal extensions or fins
disposed between adjacent opposed longitudinal edges of the slide
members to provide smooth and noisless sliding action.
Inventors: |
Dobbratz; Edward J. (Watertown,
WI) |
Assignee: |
Dobbratz; Janet E. (Watertown,
WI)
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Family
ID: |
26971972 |
Appl.
No.: |
05/397,784 |
Filed: |
September 17, 1973 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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300773 |
Oct 25, 1972 |
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Current U.S.
Class: |
384/23;
108/83 |
Current CPC
Class: |
A47B
1/10 (20130101) |
Current International
Class: |
A47B
1/10 (20060101); A47B 1/00 (20060101); F16C
017/00 () |
Field of
Search: |
;108/83 ;308/3.6
;312/348,341NR,334,346,347 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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1,320,821 |
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Jan 1962 |
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FR |
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771,706 |
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Feb 1934 |
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FR |
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Primary Examiner: Myhre; Charles J.
Assistant Examiner: Lazarus; R. H.
Parent Case Text
This application is a continuation-in-part of application Ser. No.
300,773, filed Oct. 25, 1972 now abandoned, and entitled Slide
Assembly.
Claims
I claim:
1. A slide assembly, comprising a first slide member, a second
slide member disposed to slide relative to said first slide member
between a retracted and an extended position, each slide member
including a web and a pair of flanges extending outwardly from the
ends of the web, the flanges of said first slide member being in
proximate abutting relation to corresponding flanges of the second
slide member, the flanges of each slide member in combination with
the web defining a female dovetail groove extending longitudinally
of the slide member, a first block secured with the groove of the
first slide member and freely slidable within the groove of the
second slide member, a second block secured within the groove of
the second slide member and freely slidable within the groove of
the first slide member, opposite sides of each block having opposed
male dovetail portions mating with the female dovetail grooves of
said slide members, each male dovetail portion including an
inclined surface that intersects the inclined surface of a second
male dovetail portion at a central groove, and a fin extending
outwardly from each groove with each fin having a pair of generally
flat opposed surfaces with one of said opposed surfaces being
disposed flatwise against the flange of said first slide member and
the other of said opposed surfaces being disposed flatwise against
the flange of said second slide member, to prevent contact between
said flanges.
2. The slide assembly of claim 1, and including a pin extending
through said first block and engaged within an opening in the web
of the first slide member, said pin extending beyond the web of
said first slide member in a position to be engaged by said second
block and thereby limit the sliding movement of the second slide
member.
3. The slide assembly of claim 1 wherein each fin extends
substantially the length of the block.
4. The slide assembly of claim 3, wherein the fins of each block
lie in a common plane.
5. The slide assembly of claim 1, wherein the blocks are formed of
a plastic material having a low coefficient of sliding
friction.
6. A slide assembly, comprising a first slide member having a first
longitudinally extending guideway and having a first surface
bordering said guideway, a second slide member disposed to slide
relative to the first slide member between a retracted and extended
position, said second slide member having a second longitudinally
extending guideway facing the first guideway and having a second
surface bordering the second guideway and facing said first
surface, a first block secured within the first guideway and freely
slidable within the second guideway, a second block secured within
the second guideway and freely slidable within the first guideway,
each slide member having a vertical web and a pair of spaced
flanges located at the ends of said web, said flanges in
combination with said web defining said guideways, and a pin
disposed within aligned openings in each block and the web of the
respective slide member, and end of said pin extending beyond the
web of the slide member in a position to be engaged by a second
block slidable with respect to that slide member and thereby limit
the sliding movement of said second block.
7. The slide assembly of claim 6, wherein said pin is generally
C-shaped in cross section, said C-shape providing a resilient
action to urge the pin into tight bearing engagement with the block
and the slide member.
8. A slide assembly, comprising a first slide member, a second
slide member disposed to slide relative to said first slide member
between a retracted and an extended position, each slide member
including a web and a pair of flanges extending outwardly from the
ends of the web, the flanges of said first slide member abutting
corresponding flanges of said second slide member, the flanges of
each slide member in combination with the web defining a female
dovetail groove extending longitudinally of the slide member, a
first block secured within the groove of the first slide member and
freely slidable within the groove of the second slide member, a
second block secured within the groove of the second slide member
and freely slidable within the groove of the first slide member,
each block having a pair of opposed male dovetail portions mating
with the female dovetail grooves of said slide members, recess
means disposed in the periphery of one of the male dovetail
portions of a block, and a projection disposed on a flange of the
slide member and projecting inwardly from said flange and received
within said recess means to lock said block to the slide
member.
9. The slide assembly of claim 8, wherein each side of each block
is provided with an upper deverging flange and a lower diverging
flange which in combination define a male dovetail portion, said
recess means being located in the the upper surface of an upper
diverging flange.
10. The slide assembly of claim 8, wherein each block is formed
with a central opening disposed in alignment with an opening in the
web of the corresponding slide member, and a pin disposed within
the aligned openings to secure the block to the slide member.
11. The slide assembly of claim 8, wherein each male dovetail
portion includes an inclined surface that intersects an inclined
surface of a second male dovetail portion at a central groove, said
recess means being a generally circular depression formed in one of
said inclined surfaces.
12. A slide assembly, comprisng a first slide member, a second
slide member disposed to slide relative to said first slide member
between a retracted and an extended position, each slide member
including a web and a pair of flanges extending outwardly from the
ends of the web, the flanges of said first slide member abutting
corresponding flanges of the second slide member, the flanges of
each slide member in combination with the web defining a female
dovetail groove extending longitudinally of the slide member, a
first block secured within the groove of the first slide member and
freely slidable within the groove of the second slide member, a
second block secured within the groove of the second slide member
and freely slidable within the groove of the first slide member,
each block having four sides and having a pair of outwardly
diverging surfaces extending substantially completely around all
four sides of the block and defining a pair of opposed male
dovetail portions mating with the female dovetail grooves of said
slide members, and an outwardly projecting fin disposed between
said diverging surfaces and extending substantially continuously
around all four sides of said block, portions of said fin located
at opposite sides of the block being disposed between abutting
flanges of the sliding members to prevent contact between said
flanges.
13. The slide assembly of claim 12, wherein at least two adjacent
sides of each block are provided with a depression, and a
projection disposed on each slide member and engaged with the
respective depression to lock each block to the respective slide
member.
14. The slide assembly of claim 12, wherein said slide assembly
also includes a pin extending through each block and engaged within
an opening in the web of the respective slide member, the pin
associated with said first block projects beyond the web of the
respective slide member in a position to be engaged by the second
block to thereby limit the sliding movement of said second block,
the portions of said fin extending along at least two adjacent
sides of the second block each having a notch disposed to receive
the projecting end of the pin of the first block.
15. The slide assembly of claim 14, wherein the length of one pair
of opposed sides of the block is slightly greater than the length
of the other pair of opposed sides.
Description
BACKGROUND OF THE INVENTION
A slide assembly is utilized with an extension table to permit the
ends of the table to be extended or moved apart and enable
additional leaves to be inserted between the extended ends to
increase the overall table area. In the normal slide assembly, one
of the slide members is secured to one end of the table, while
another slide member is secured to the other end of the table, so
that when the table ends are moved apart the slide assembly will
extend and provide a support for the additional leaves.
When the slide assembly is in the extended position, it must bear a
substantial weight or load, and in the past problems have arisen in
connection with the strength, warping and bending of the slide
members. Formerly wood slides were used almost exclusively, but
wood slides have the disadvantage that they are subject to warpage
due to heat and humidity changes, and warpage can result in jamming
of the slide members. More recently steel slides have been employed
which have the advantage of not being affected by moisture and thus
the problem of warping is eliminated. While the steel slides
provide a reduction in bulkiness over wood slides, they are
relatively heavy and are also subject to corrosion.
SUMMARY OF THE INVENTION
The invention is directed to a lightweight slide assembly which has
improved smooth and noiseless sliding action. According to the
invention, the slide assembly includes a series of extruded
aluminum slide members which are positioned in interconnected
side-by-side relation with each slide member adapted to slide
relative to the adjacent slide member between a retracted and
extended position. The side surfaces of the slide members are
provided with longitudinal female dovetail grooves, and plastic
blocks, preferably formed of a self-lubricating plastic material
having a low coefficient of sliding friction, such as an acetal
resin, are formed with opposed male dovetail portions which mate
with the female dovetail grooves of the slide members. Each block
is secured within the groove of one slide member and is freely
slidable within the groove of the adjacent slide member.
To provide improved smooth and noiseless sliding action, each block
is provided with a pair of opposed longitudinal fins or extensions
which extend between the adjacent opposed longitudinal edges of the
slide members. The fins prevent metal-to-metal contact between the
longitudinal edges of the slide members, eliminating galling of the
metal as well as jamming or sticking of the slide members due to
temperature or humidity variations.
The slide assembly of the invention is a compact, lightweight unit
having a smooth sliding action which is not affected by temperature
or humidity variations.
As a further advantage, the slide assembly is relatively
inexpensive to manufacture due to the use of a number of
identically shaped components.
Other objects and advantages will appear in the course of the
following description.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the slide assembly of the
invention;
FIG. 2 is a plan view of the slide assembly with parts broken away
in section and showing the slide assembly in the extended
position;
FIG. 3 is an enlarged end view of the slide assembly;
FIG. 4 is an enlarged side elevation of one of the slide members
with parts broken away and showing the attachment of the block to
the slide;
FIG. 5 is a section taken along line 5--5 of FIG. 4;
FIG. 6 is a view similar to FIG. 2, showing the slide members in
the retracted position.
FIG. 7 is a perspective view of a modified form of the block;
FIG. 8 is a side elevation of one of the slide members with parts
broken away in section and incorporating the block of FIG. 7;
and
FIG. 9 is a section taken along line 9--9 of FIG. 8.
DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 shows a slide assembly which is composed of three slide
members 1, 2 and 3, which are adapted to slide relative to each
other between retracted and extended positions. The slide assembly,
as shown in FIG. 1, is adapted to be associated with an extension
table with the slide members 1 and 3 being secured to the table
ends. As the table ends are moved apart to an extended position,
the slide assembly will extend with the central slide member 2
extending across the gap between the table ends to support the
added table leaves.
The slide member 1 is provided with a vertical web 4 and a flange 5
extends outwardly from the upper edge of the web 4 and is provided
with a series of mounting holes 6 through which the slide member 1
is attached to the end of the extension table. In addition, the
slide member 1 is provided with an upper flange 7 and a lower
flange 8 which extend inwardly toward the slide member 2, and in
combination with the web 4, define a female dovetail groove 9.
The central slide member 2 is provided with a vertical web 10 and a
pair of upper flanges 11 extend outwardly in opposite directions
from the upper edge of the web 10, while a pair of lower flanges 12
extend outwardly from the lower edge of the web 10. The flanges 11
and 12 in combination with the vertical web 10 define a pair of
female dovetail grooves 13 on either side of the slide member
2.
The slide member 3 has a structure similar to that of slide member
1 and comprises a vertical web 14, and a flange 15 extends
outwardly from the upper edge of the web 14 and is provided with a
series of mounting holes 16.
Slide member 3 is also formed with an inwardly extending upper
flange 17 and an inwardly extending lower flange 18 which, in
combination with web 14, define a female dovetail groove 19.
Blocks 20 having opposed male dovetail portions are disposed in
mating relation with the female dovetail grooves 9, 13 and 19 of
the slide members 1-3. Each block 20 is fixed within the groove of
one of the slide members and is adapted to be freely slidable
within the groove of the adjacent slide member. The blocks 20 are
formed of a material having a low coefficient of sliding friction
and which will not appreciably change its dimensions under
temperature and humidity changes. It has been found that acetal
resin sold under the trademark Delrin provides a very satisfactory
material for use as the blocks 20.
Each block is provided with a central hub 21 having a hole 22 and a
spring pin 23 having a C-shaped cross section extends through the
hole 22 and through an aligned hole in the web of the slide member
to lock the block to the slide member. FIGS. 4 and 5 best
illustrate this construction and show the block 20 secured to slide
member 3. The attachment of blocks 20 to the slide members 1 and 2
is similar to that shown with respect to slide members 3. As shown
in FIG. 6, two of the pins 23 associated with the blocks 20
attached to slide member 2 are provided with projecting ends 24
which serve as stops to limit the retracting movement of the slide
members and prevent the slide members from running out. With the
three-piece slide assembly as shown in FIG. 6, the projecting pin
end 24, shown at the left hand end of FIG. 6, provides a stop to
limit the inward or retracting movement of the slide member 3,
while the projecting pin end 24 shown at the right hand portion of
FIG. 6 is adapted to engage the block 20 connected to the slide
member 1 to provide a stop for the inward movement of the slide
member 2. The C-shape provides a spring return for the pin 23,
urging the pin toward a larger diameter and thereby effecting a
positive locking action to the block 20 and slide member.
As best illustrated in FIG. 5, each block is provided with
diverging upper and lower ends 26 which define the male dovetail
portions which mate with the female dovetail grooves 9, 13 and 19
in the slide members. In addition, each block is provided with a
pair of vertical side edges 27 which extend between the upper and
lower diverging ends 26 and a central reinforcing wall 28 is
connected between the hub 21 and the diverging ends 26.
As an important feature of the invention a pair of fins or
extensions 29 extend outwardly from the upper and lower ends of
each block 20 and are adapted to be received between the adjacent
longitudinal edges of the flanges on the slide members. As shown in
FIG. 3, the fins 29 act to separate the flanges 7 and 11 and 8 and
12 of the slide members 1 and 2 and also serve to separate the
flanges 11 17 and 12 and 18 of the slide members 2 and 3. Fins 29
prevent metal-to-metal contact between the slide members, thereby
insuring smooth and noiseless sliding action and preventing the
possibility of jamming or sticking due to temperature or humidity
variations.
To firmly position each block 20 to the respective slide member,
the upper edge of each block is provided with a recess or dimple
30. By striking the upper flange of the slide member, the aluminum
is deformed forming a recess 31 in the upper flange surface and a
corresponding projection 32 in the lower surface which is received
within the recess 30 in the block to thereby lock the block with
respect to the slide member. In addition to properly locating the
block 20 with respect to the slide member, the action of deforming
the aluminum serves to drive the block toward the lower flange of
the slide member. As the block bears tightly against the lower
flange of the slide member, any tendency for the slide members to
sag when extended is eliminated.
As best illustrated in FIG. 4, the upper surfaces 33 and 34 of the
upper ends 26 of the blocks are provided with different angularity.
Similarly, the lower surfaces 35 and 36 of the lower divering ends
26 are located at different angles with respect to vertical plane.
While the female dovetail grooves 9, 13 and 19 in the slide members
have an identical cross sectional configuration, the difference in
the angularity between the diverging surfaces 33 and 34 and between
surfaces 35 and 36 acts to provide a wedging type of prestressing
action so that as the central slide member 2 is extended it will be
wedged upwardly at a slight upward angle to the horizontal. When
the weight of the leaves and any other load is applied to the
extended central slide member 2, it will then lower to a generally
horizontal position.
To limit the extended movement between the slide members 1-3,
wooden or plastic blocks 37 and 38 can be located within the mating
dovetail grooves, as shown in FIG. 6. The blocks 37 and 38 provide
stops to limit the outward or extended movement of the slide
members. Other forms of stops can be used in place of blocks 37 and
38. For example, the vertical webs of the slide members can be
provided with punched out tabs which project laterally of the webs
and serve in a similar manner as stops.
The retracted position of the slide assembly is shown in FIG. 6,
and as previously described, the projecting pin ends 24 serve as
stops to limit the inward or retracted movement of the slide
members. FIG. 2 shows the extended position of the slide assembly
with the blocks 37 and 38 being engaged by the corresponding blocks
20 to limit the extended movement of the slide members.
FIGS. 7-9 illustrate a modified form of the invention in which a
generally square block 39, similar to block 20 of the first
embodiment, is fixed within the groove of one of the slide members
and is adapted to be freely slidable within the groove of the
adjacent slide member. As in the case of blocks 20, the blocks 39
are formed of a plastic material having a low coefficient of
sliding friction.
Each of the blocks 39 is provided with a central wall 40 and a hub
41 having a hole or bore 42 extends outwardly in opposite
directions from the wall 40. A spring pin 43, similar in structure
and function to pin 23, extends through the hole 42 and through an
aligned hole in the web of the slide member to lock the block 39 to
the slide member. As described in connection with the first
embodiment, certain of the pins 43 have projecting ends which
provide a stop to limit the sliding movement of the slide
members.
Flanges 44 and 45 diverge outward from the entire periphery of the
wall 40 and the diverging flanges define male dovetail portions
which mate with the female dovetail grooves 9, 13 and 19 in the
slide members. Reinforcing webs 46 extend between the central hub
41 and the diverging flanges 44 and 45.
The diverging surfaces 47 and 48 of the flanges 44 and 45,
respectively, are located at different angles with respect to a
vertical plane, as described with respect to surfaces 35 and 36 of
blocks 20. The difference in angularity between the surfaces 47 and
48 acts to provide a wedging type of prestressing action so that as
the central slide member 2 is extended it will be wedged upwardly
to a slight angle to the horizontal.
As in the case of the previous embodiment, an outwardly projecting
fin or extension 49 extends around the entire periphery of the
block 39 between the diverging flanges 44 and 45. The fin 49 serves
to separate the flanges 7 and 11 and 8 and 12 of the slide members
1 and 2 and also separate the flanges 11 and 17 and 12 and 18 of
the slide members 2 and 3.
As illustrated in FIG. 6, the portion of the fin 49 extending along
each side edge of the block is provided with a notch 50 and
depending on the position of the block 39 with respect to the slide
member, one of the notches, as illustrated in FIG. 8, will receive
the end of the spring pin 43 of another block to form a stop. Due
to the notch 50, the pin 43 will bear against the body of the block
rather than the fin 49, to provide the stop.
The portions of the diverging flange 44 extending along two
adjacent side edges of the block are provided with a pair of
dimples or recesses 51, similar to the dimples 30, as previously
described. The flanges of the slide members 1-3 are deformed into
the recesses 51 in the block to thereby lock the block with respect
to the slide member.
While the block 39 is shown as being substantially square one
dimension of the block, indicated by A, can be slightly greater
than the dimension B. As for example, the dimension A can be 0.010
inch greater than the dimension B. As the slide members are formed
of extruded aluminum, the tolerance of the female dovetail grooves
can vary slightly throughout the extrusion run as the dies become
somewhat worn. Thus, the difference in length between the
dimensions A and B enables the block to compensate for this
variation in tolerance of the aluminum extrusion and maintain a
proper sliding relationship between the block 39 and slide members.
For example, when using the extrusions from the beginning of an
extrusion run, the block can be positioned so that the larger
dimension A is inserted within the female dovetail grooves in the
slide members, as illustrated in FIG. 6, and if the fit becomes
snug in slide members formed later in the extrusion run, the blocks
can be rotated 90.degree. so that the block is inserted with the
dimension B in the female dovetail grooves, which will then provide
the necessary clearance for proper sliding action. The block 39 can
be marked in any desired manner to visually indicate the dimensions
A and B. As the notches 50 and dimples 51 are provided in all four
sides of the block, the block can be rotated through any position
and inserted within the female dovetail groove.
While the above description is illustrative of the slide assembly
of the invention as being associated with an extension table, it is
contemplated that the slide assembly can be used in any application
where it is desired to slide one component relative to a fixed
component, such as for example, drawers, shelves, under-counter
dishwashers, compactors, and the like. The slide assembly can be
used with two or more slide members depending on the particular
application.
The construction of the plastic blocks 20 and 39, including the
fins or extensions 29 and 49, provides an improved smooth and
noiseless sliding action.
As the slide members are preferably constructed of extruded
aluminum, the unit is compact, light in weight and will not be
influenced by humidity and temperature variations.
Various modes of carrying out the invention are contemplated as
being within the scope of the following claims particularly
pointing out and distinctly claiming the subjet matter which is
regarded as the invention.
* * * * *