U.S. patent number 3,679,275 [Application Number 05/152,258] was granted by the patent office on 1972-07-25 for ball bearing slide with synchronizing mechanism.
This patent grant is currently assigned to SAID Fall, by said York and said Huff. Invention is credited to Herbert S. Fall, Larry D. Huff, William D. York.
United States Patent |
3,679,275 |
Fall , et al. |
July 25, 1972 |
**Please see images for:
( Certificate of Correction ) ** |
BALL BEARING SLIDE WITH SYNCHRONIZING MECHANISM
Abstract
A drawer slide structure in which two mating slide rails
oppositely enclose an intermediate member which carries a roller
peripherally extending into longitudinal runways formed in the
rails, the runway floors presenting surfaces of one material for
pressure engagement by the peripheral surface of another material
presented by the roller, the two materials being of such character
as to establish a driving connection inhibiting slippage
therebetween. In the optimum form, the two materials are of the
type known as "VELCRO" brand hook and loop tape, and preferably the
hook type tape is on the roller while the loop type tape is on the
runway floors, though that relationship may be reversed.
Alternatively, one of the materials may be relatively soft and
elastically deformable by the other material which is relatively
hard and crenelated or otherwise roughened.
Inventors: |
Fall; Herbert S. (Indianapolis,
IN), York; William D. (Indianapolis, IN), Huff; Larry
D. (Indianapolis, IN) |
Assignee: |
SAID Fall, by said York and said
Huff (N/A)
|
Family
ID: |
22542162 |
Appl.
No.: |
05/152,258 |
Filed: |
June 11, 1971 |
Current U.S.
Class: |
384/18;
312/332 |
Current CPC
Class: |
A47B
88/493 (20170101); A44B 18/00 (20130101); A47B
2230/0011 (20130101); A47B 2210/0059 (20130101); A47B
2210/0083 (20130101); A47B 2210/0032 (20130101); A47B
2210/0013 (20130101); A47B 2210/007 (20130101); A47B
2210/004 (20130101); A47B 2210/0035 (20130101) |
Current International
Class: |
A44B
18/00 (20060101); A47B 88/10 (20060101); A47B
88/04 (20060101); F16c 029/00 () |
Field of
Search: |
;308/3.8
;312/340,341,341NR,348,332,334 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
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1,457,675 |
|
Sep 1966 |
|
FR |
|
727,787 |
|
Apr 1965 |
|
GB |
|
Primary Examiner: Schwadron; Martin P.
Assistant Examiner: Grossman; Barry
Claims
We claim:
1. A device of the class described comprising a first rail
providing two transversely spaced, longitudinally parallel channels
with a parallel runway therebetween, a second rail providing two
transversely spaced, longitudinally parallel channels with a
parallel runway therebetween, said channels and runway of said
second rail being arranged in facing registry with the channels and
runway of said first rail, an intermediate member having parallel
legs slidably received respectively in the channels of both rails,
a bridge member joining said legs substantially at their centers of
length, a roller journalled on a transverse axis on said bridge
member with its periphery extending into both of said runways, and
an elongated ball bearing cage retained in each of said channels
for longitudinal reciprocation therein, each cage further having
retaining engagement with one of said legs, the floor of each
runway presenting a surface of one kind of material and the
peripheral face of said roller presenting a surface of another kind
of material engaging and cooperating with said runway surfaces to
inhibit slippage of said roller relative to said runway floors.
2. The device of claim 1 in which one of said materials is
resiliently deformable and the other of said materials is rigid and
roughened.
3. The device of claim 1 in which one of said materials is
rubberoid and the other is metallic and crenelated.
4. The device of claim 1 in which said runway floor surface
material is rubberoid and said roller peripheral surface material
is roughened metal.
5. The device of claim 1 in which said runway floor surface
material is expanded metal and said roller peripheral surface
material is rubberoid.
6. The device of claim 1 in which one of said materials is a fabric
covered with a multiplicity of stiff little hooks and the other of
said materials is a fabric covered with a multiplicity of tiny,
soft loops with which such hooks retentively interengage when the
two materials are pressed together.
7. The device of claim 6 in which said one material constitutes the
roller peripheral surface and said other material constitutes the
runway floor surfaces.
8. A device of the class described comprising a first rail
providing two transversely spaced, longitudinally parallel channels
with a parallel runway therebetween, a second rail providing two
transversely spaced, longitudinally parallel channels with a
parallel runway therebetween, said channels and runway of said
second rail being arranged in facing registry with the channels and
runway of said first rail, an intermediate member having parallel
legs slidably received respectively in the channels of both rails,
a bridge member joining said legs substantially at their centers of
length, a rotor journalled on a transverse axis on said bridge
member with its periphery extending into both of said runways, an
elongated ball bearing cage retained in each of said channels for
longitudinal reciprocation therein, each cage further having
retaining engagement with one of said legs, and means including
said rotor for enforcing relative longitudinal movement between
said first rail and said intermediate member in one direction and
at the same rate as a consequence of relative longitudinal movement
between said second rail and said intermediate member in the
opposite direction.
9. In combination, a first elongated member providing longitudinal
guide means and a parallel runway, a second elongated member
providing corresponding longitudinal guide means and a
corresponding runway, an intermediate member providing slide means
retentively received in both guide means for relative longitudinal
movement, roller means journalled on said intermediate member and
peripherally extending into said runways, a face of each runway
presenting a surface of one kind of material and said roller means
peripherally presenting a surface of another kind of material, one
of said materials being a fabric covered with a multiplicity of
stiff little hooks and the other of said materials being a fabric
covered with a multiplicity of tiny, soft loops with which such
hooks retentively interengage when the two materials are pressed
together, said parts being so constructed and arranged that a
rolling, pressure engagement is maintained between said roller
means surface and said runway surfaces during relative longitudinal
movement of said three members.
10. In a device of the class described, a first rail providing
longitudinal guide means and a parallel runway, a second rail
providing corresponding longitudinal guide means and a
corresponding runway, an intermediate member providing slide means
retentively received in the guide means of both rails for relative
longitudinal reciprocation, a roller journalled on said
intermediate member with its periphery extending into said runways,
the floor of each runway presenting a surface of one kind of
material and the peripheral face of said roller presenting a
surface of another kind of material, one of said materials being a
fabric covered with a multiplicity of stiff little hooks and the
other of said materials being a fabric covered with a multiplicity
of tiny, soft loops with which such hooks retentively interengage
when the two materials are pressed together, said parts being so
constructed and arranged that said roller face maintains a rolling,
pressure engagement with both of said floors during relative
longitudinal movement of said rails and intermediate member.
11. The combination of claim 9 in which the surface material of
said runways is the loop type while the surface material of said
roller means is the hook type.
12. The device of claim 1 in which said bridge member is secured at
its opposite edges to said legs, respectively, and having an
intermediate opening therethrough, a finger integral with one
lateral edge of said opening and extending into said opening with
its distal end free, said roller having a concentric bore whose
diameter is at least equal to the width of said finger, and two
substantially half-round blocks fixed to the opposite faces of said
finger, respectively, the radii of said blocks, measured in
directions perpendicular to said faces, being equal and, in sum,
less than the diameter of said bore by approximately the thickness
of said finger, said roller being sleeved on said blocks to define
the journal mounting for said roller.
13. The device of claim 12 in which said bridge member is a
resiliently flexible sheet.
Description
The present invention relates to a ball bearing slide with
synchronizing mechanism and is directed primarily to the provision
of heavy duty means for supporting a structure during movement of
that structure between what may be referred to as a rest position,
and one or more extended positions, which extended positions may be
oppositely spaced from the rest position of the structure. A
primary object of the invention is to provide, in such a mechanism,
inexpensive, readily applied, longlived means for ensuring the
maintenance of a balanced condition among the several parts of the
slide structure.
Further objects of the invention will appear as the description
proceeds.
To the accomplishment of the above and related objects, our
invention may be embodied in the forms illustrated in the
accompanying drawings, attention being called to the fact, however,
that the drawings are illustrative only, and that change may be
made in the specific constructions illustrated and described, so
long as the scope of the appended claims is not violated.
FIG. 1 is a fragmental, isometric view of one end of a slide
structure constructed in accordance with the present invention,
showing the structure in partially extended condition;
FIG. 2 is an enlarged, fragmentary elevational view of a mid
portion of the assembly illustrated in FIG. 1, parts being broken
away for clarity of illustration;
FIG. 3 is a transverse section taken substantially on the line 3--3
of FIG. 2;
FIG. 4 is an enlarged, isometric view of a fragment of a bridge
member, illustrating details of a journal mounting for a roller
which is an important feature of our invention;
FIG. 5 illustrates a fragment of a back plate, showing one form of
material which may be used as a runway floor surface in accordance
with our invention;
FIG. 6 is a sectional view somewhat diagrammatically illustrating a
roller in cooperative engagement with runway surfaces of the
character illustrated in FIG. 5;
FIG. 7 is a fragmentary, exploded, somewhat diagrammatic
illustration of a back plate provided with a different form of
runway floor material and a bridge member carrying a roller whose
peripheral surface is covered with still another kind of material
for cooperation with the runway floor material; and
FIG. 8 is a view similar to FIG. 6 but showing the floor and roller
surface materials of the kinds suggested in FIG. 7.
Referring more particularly to FIG. 1, it will be seen that we have
illustrated a fragment of a three-member slide rail structure. When
such a structure is used at each side of a drawer member to support
that drawer member for outward and inward movement relative to a
frame, the rail 10 may be suitably secured to one side of a drawer
opening in a frame while the second rail 11 is secured to one side
of the drawer structure to support the same, an intermediate member
12 being interposed, and providing an operative connection, between
the first and second rails 10 and 11. The intermediate member 12 is
suitably retained for longitudinal reciprocation only relative to
the rail 10, and the rail 11 is suitably retained for longitudinal
sliding movement only with respect to the intermediate member 12.
Slide structures of this general character, as thus far described,
are well known in the art to which the present invention pertains;
and our invention resides in the details of structure to be
described, whereby the slide structure is improved, its
manufacture, assembly and maintenance are rendered more economical
and maintenance of a balanced condition among the three major parts
of the slide structure is significantly improved.
As will be perceived from a careful examination of FIGS. 1, 2 and
3, the rail 10 comprises a first elongated channel element 13 of
C-shaped cross section and a second elongated channel element 14 of
C-shaped section arranged in transversely-spaced parallelism with
the channel element 13 to define a parallel runway 15 therebetween.
The channel elements 13 and 14 are spanned and joined by a back
plate 16 which may be spot welded to the backs of the elements 13
and 14 and is preferably longitudinally coextensive therewith. A
stop bar 17 blocks one end of the runway 15 and a similar stop bar
(not shown) blocks the opposite end thereof.
The longitudinal edges of the channel element 13 are shaped to
provide a curled lip 18 defining a longitudinal trackway 19 and an
oppositely curled lip 20 defining a trackway 21 facing the trackway
20. Similarly, the channel member 14 has its edges shaped to
provide a curled lip 22 defining a trackway 23 and a curled lip 24
defining a facing trackway 25.
A generally U-shaped ball bearing cage 26 of known construction
carries a series of balls 27 at one side retentively enterable in
the trackway 19 and carries a series of balls 28 at its opposite
side retentively receivable in the trackway 21, whereby said cage
is retained in the channel 13 for longitudinal reciprocation only
relative thereto. A similar cage 29 provided with a series of balls
30 and a series of balls 31 is similarly retained for reciprocation
only in the channel element 14 with its balls 30 in the trackway 23
and its balls 31 in the trackway 25.
The rail 11 is identical, but allochirally arranged with respect to
the rail 10. As is most clearly to be seen in FIG. 3, the rail 11
comprises a C-shaped channel 33 and a C-shaped channel 34 arranged
in parallelism to define a parallel runway 35 therebetween. A back
plate 36 spans and is preferably spot welded to the back surfaces
of the channel members 33 and 34 and a stop bar 37 blocks one end
of the runway while a similar stop bar (not shown) blocks the other
end of the runway. The channel member 33 is formed to provide a
curled lip 38 defining a trackway 39 and a curled lip 40 defining a
trackway 41 facing the trackway 39. The channel member 34 is formed
to provide a curled lip 42 defining a trackway 43 and a curled lip
44 defining a trackway 45 facing the trackway 43. A cage 46 having
a series of balls 47 retentively received in the trackway 39 and a
series of balls 48 retentively received in the track-way 41 is thus
retained for longitudinal reciprocation only in the channel member
33; while a similar cage 49 is similarly retained in the channel
member 34 by engagement of its balls 50 in the trackway 43 and
engagement of its balls 51 in the trackway 45.
The intermediate member 12 consists of four identical bars 52, 53,
54 and 55. The bars 52 and 53 are secured together back to back to
form a leg and the bars 54 and 55 are secured together back to back
to form a similar leg; and a bridge piece 56, interposed between
the bar pairs, spans and joins the legs substantially at their
centers of length. As will appear more fully hereinafter, the
lateral edges of the bridge piece may be substantially coincident
in length with the legs of the intermediate member 12, or separate
spacer pieces (not shown) may be interposed between the bars of
each leg to prevent bar warpage.
Each of bars 52, 53, 54 and 55 is formed to provide, at its lateral
edges, parallel, longitudinal lips 57 and 58 shaped to define
outwardly presented trackways 59 and 60 so located, when the parts
are assembled, as retentively to receive the ball series 27 and 28,
respectively, or the corresponding series of the associated cage.
It will be perceived that, with the stops blocking the ends of the
runways removed, the intermediate member 12 can be telescoped into
both of the rails 10 and 11, thus engaging the balls of the several
cages, whereby the assembly of three major parts will be
completed.
The ball bearing cages 26, 29, 46 and 49 may be of the character
illustrated, in which each ball of each series is received in its
individual pocket and longitudinally spaced from every other ball
of the series, or they may be of the type in which only the
terminal balls of a series are held in individual pockets spaced
apart at a fixed distance, while the intermediate balls of the
series are longitudinally restrained only by each other and by the
terminal balls. The two types are commercially known and, so far as
the present invention is concerned, are interchangeably usable to
connect the several major elements of the assembly for relative
longitudinal movement only.
Of course, the expression "ball bearing cage" as used herein refers
to the complete assembly including not only the pocket-forming,
restraining device but also the series of balls restrained
thereby.
Quite obviously, when the parts as thus far described are so
assembled and the rail 11 is moved toward the left, for instance,
while the rail 10 is held stationary, the intermediate member 12
may or may not be entrained to an indeterminate extent; and when
the rail 11 reaches full registry with the rail 10, the
intermediate member 12 may have trailed behind the rail 11 and thus
be left protruding from the right-hand end of the assembly, or it
may have preceded the rail 11 and so be left protruding from the
left-hand end of the assembly. Such conditions are patently
undesirable, and further it is desirable that the three major
elements of the assembly remain in balanced condition at all times
during the complete path of movement of the drawer or other
structure supported by the slide assembly. It is thus a major
objective of the present invention to provide novel, inexpensive
and highly effective means to enforce the desired relative movement
among the three major elements of the assembly.
To that end, we mount upon the intermediate member 12 a roller or
rotor 66 so located, proportioned and designed as to extend
peripherally into both of the runways 15 and 35. Each runway is so
constructed that its floor presents a surface of one kind of
material and the roller periphery is so constructed as to present a
surface of a different kind of material cooperative with the runway
floor material to establish a highly effective driving connection
between the runway surfaces and the roller surface.
Because of the functions assigned to these parts, and because of
the limited space available for the mounting of such a rotor, the
details of that mounting become quite important.
Referring to FIG. 4, it will be seen that our bridge piece 56,
which must be quite thin in a direction perpendicular to the runway
floors, is a piece of sheet material. We have found thin sheet
steel to be an acceptable material, but we believe that sheet brass
or bronze could be used and that some of the synthetic plastic
sheets might also be used. Desirably, the material of the bridge
piece should be resiliently flexible for a reason which will
appear.
As shown in FIG. 4, the bridge piece comprises a longitudinally
extending base 61 formed with an opening 64 therethrough to define
longitudinally-spaced legs 62 and 63. The base 61 of the bridge
piece 56 is disposed between, and suitably secured to, one of the
pairs of bars, for instance 54 and 55, of the intermediate member
12. As has been indicated, the length of the base 61 may be
substantially coincident with the length of the leg pair between
which it is disposed, or it may be only of sufficient length to
support the longitudinally spaced legs 62 and 63, in which case
separate spacer pieces will be arranged between the bars 54 and 55
on both sides of the bridge piece.
The legs 62 and 63 extend from the base 61 with their distal end
regions disposed between the other bar pair, for instance, 52 and
53 and are there secured to the bars. Here, again, integral,
longitudinal extensions from the distal ends of the legs 62, 63 may
continue to the opposite ends of the bar pair, or separate spacers
(not shown) may be arranged between the bars on opposite sides of
the base piece.
At a point preferably mid-way between the legs 62, 63, a finger 65
extends from the base 61 into the opening 64. Near the distal end
of the finger 65, a substantially half round bar 68 is welded to
one face of said finger and a mating, similar bar 69 is welded to
the opposite face of said finger in registry with the bar 68. The
radius of curvature of each bar is at least equal to one-half the
width of the finger 65 and the radial dimension of each bar
measured in a direction perpendicular to the faces of the finger is
less than the radius of curvature by one-half the thickness of the
finger 65. Thus, the bars 68 and 69, when secured to the finger,
cooperate to define a cylindrical axle having a diameter
substantially equal to the internal diameter of the axial bore 67
of the roller 66 which is journalled on said axle. Preferably, of
course, the roller 66 includes anti-friction means (not shown)
directly journalled on the axle.
While we have shown the bars 68 and 69 of such radial curvature
that the axle diameter is substantially equal to the width of the
finger 65, it will be apparent that they may be larger, but cannot
be smaller.
The parts are so proportioned and designed, and the roller 66 is so
positioned on the finger 65, that when the parts are assembled, the
roller 66 peripherally extends into, and is guided by the runways
15 and 35 and into pressure engagement with the surface materials
of the floors of both runways. Because of the inherent resilient
flexibility of the material from which the bridge piece is formed,
the finger 65 is sufficiently resiliently flexible to permit the
roller to maintain pressure engagement with the runway floor
surfaces in spite of any minor unevennesses in such floor
surfaces.
Various pairs of surface materials are available for use on the
runway floors and the peripheral surface of the roller. Thus, for
instance, in FIG. 3 we have shown rubberoid strips 70 secured to
the runway floors and cooperating with 71 is metal which has been
roughened, knurled or otherwise with a roller whose peripheral
surface 6, we have shown expanded metal stripes 74 secured to the
runway floor and cooperating with a roller 66 whose peripheral
surface is rubberoid material 75.
We presently believe, however, that optimum materials for this use
are as illustrated in FIGS. 7 and 8 in which each runway floor
bears a strip 76 of fabric covered with a multiplicity of soft,
tiny loops, while the peripheral surface of the roller bears a
strip 77 of fabric covered with a multiplicity of stiff little
hooks which retentively interengage with said loops when the two
materials are pressed together. A characteristic of those materials
is that, when so pressed together, they strongly resist separation
by forces applied in a direction parallel to the interface or in a
direction perpendicular to the interface, but may readily be
separated by "peeling" forces.
Such materials are available on the open market from VELCRO Corp.,
with offices at 681 Fifth Avenue, New York City in the United
States and from Canadian Velcro, Ltd. with offices at 114 East
Drive, Bramalea, Ontario in Canada, and are known as "VELCRO" brand
hook and loop tape fasteners, and they are described in detail in a
six-page brochure published by the former corporation, and a print
of which is attached hereto.
It will be perceived that, as relative longitudinal movement occurs
between the rails 10 and 11 and the intermediate member 12, the
roller 66 with its strip 77 will rotate upon its axle while the
strip 77 is in pressure contact with the strips 76 of the two
runways 15 and 35. As the roller turns, points on its peripheral
surface will be pressed against successive points of the runway
floor surfaces to produce the above-mentioned interengagement of
hooks with loops to establish firm driving connections between the
roller surfaces and the runway floor strips; but it will also be
perceived that, as those successive points move away from the
roller, the rotation of the roller produces a "peeling" action
which readily disengages the hooks from the loops.
While reasonably satisfactory results are achieved with the
cooperating materials of FIGS. 3 and 5 and 6, we have found that
the form illustrated in FIGS. 7 and 8 is more effective against
slippage and is longer-lived and therefore appears to be
optimum.
It will be apparent that the illustrated assembly is of such
character that it may be extended in either longitudinal direction
from its completely collapsed condition. Of course, when the
assembly is to be used as a drawer slide, one of the rails 10 or 11
will be fixedly mounted upon a frame while the other rail will
support the drawer. The assembly can be used in other environments,
such as, for instance, in an extensible table in which opposite end
portions move concurrently away from a central support in opposite
directions, in which case the intermediate member 12 will be
secured to the frame, one leaf or end portion will be secured to
one of the rails and the other leaf or end portion will be secured
to the other rail. In such an environment, when one leaf or end
portion is pulled away from the frame, the other leaf or end
portion will automatically move, at the same rate, in the opposite
direction away from the frame.
* * * * *