U.S. patent number 3,687,505 [Application Number 05/152,250] was granted by the patent office on 1972-08-29 for slide with synchronizing cable drive.
This patent grant is currently assigned to Herbert S. Fall. Invention is credited to Maxwell S. Fall, Ronald D. Lambert.
United States Patent |
3,687,505 |
Fall , et al. |
August 29, 1972 |
**Please see images for:
( Certificate of Correction ) ** |
SLIDE WITH SYNCHRONIZING CABLE DRIVE
Abstract
A drawer slide structure in which two mating slide rails
oppositely enclose an intermediate element which carries a roller
registering with the transversely-central regions of the rails, a
cable being anchored to one end of one rail, extending around the
roller and being tautly anchored to the corresponding end of the
other rail, and another cable being anchored to the opposite end of
the other rail, extending around a roller and being tautly anchored
to the opposite end of the one rail, all to provide an affirmative
driving connection among the parts such that, if one rail is held
stationary and the other rail is moved longitudinally in either
direction, the intermediate element will be moved in the same
direction and at one-half the velocity of the moving rail. In one
form of the invention, there may be a single roller for both
cables, in another form there may be two rollers on a common axis,
but in the preferred form there are separate rollers on separate
axes, each axis being spaced as far as possible from its cable
anchorage when the structure is fully collapsed.
Inventors: |
Fall; Maxwell S. (Indianapolis,
IN), Lambert; Ronald D. (Indianapolis, IN) |
Assignee: |
Fall; Herbert S. (Indianapolis,
IN)
|
Family
ID: |
22542134 |
Appl.
No.: |
05/152,250 |
Filed: |
June 11, 1971 |
Current U.S.
Class: |
384/18; 312/110;
312/331 |
Current CPC
Class: |
F16C
29/04 (20130101); A47B 88/493 (20170101); A47B
2210/0059 (20130101); A47B 2210/007 (20130101); A47B
2210/004 (20130101); A47B 2210/0032 (20130101); A47B
2210/0072 (20130101); A47B 2210/0035 (20130101) |
Current International
Class: |
A47B
88/10 (20060101); A47B 88/04 (20060101); F16C
29/04 (20060101); F16c 029/00 () |
Field of
Search: |
;308/3.8
;312/110,331,340,341,334 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Schwadron; Martin P.
Assistant Examiner: Grossman; Barry
Claims
We claim:
1. In combination, a first elongated member providing longitudinal
guide means, a second elongated member providing corresponding
longitudinal guide means, an intermediate element providing slide
means retentively associated with both guide means for relative
longitudinal movement only, means moving with said intermediate
element and establishing an abutment surface facing away from one
end of said members and an abutment surface facing away from the
opposite end of said members, flexible strand means anchored near
one end of said first member, trained about the abutment surface
which faces away from said one end of said first member and tautly
anchored near the corresponding end of said second member, and
flexible strand means anchored near the opposite end of said second
member, trained about the abutment surface which faces away from
said opposite end of said second member and tautly anchored near
the opposite end of said first member.
2. The combination of claim 1 in which said means establishing said
abutment surfaces is roller means.
3. The combination of claim 2 in which said roller means is
journalled on a single axis fixed relative to said intermediate
element and extending transversely relative to the length of said
intermediate element.
4. The combination of claim 3 in which said roller means is a
single roller formed with separate peripheral grooves for the
reception of said strand means, respectively.
5. A device of the class described comprising a first rail
providing two transversely-spaced, longitudinally parallel
channels, a second rail providing two transversely-spaced
longitudinally parallel channels, said channels of said second rail
being arranged in facing registry with the channels of said first
rail, an intermediate element having parallel legs slidably
received, respectively, in the channels of both rails, a bridge
member joining said legs substantially at their centers of length,
roller means journalled on a transverse axis on said bridge member
with its periphery aligned with the spaces between the channels of
said rails, 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, flexible strand
means anchored near one end of said first rail, trained about said
roller means and tautly anchored near the corresponding end of said
second rail, and flexible strand means anchored near the opposite
end of said second rail, trained about said roller means and tautly
anchored near the corresponding end of said first rail.
6. The device of claim 5 in which said anchorages are all located
in registry with the spaces between the channels of said rails.
7. The device of claim 5 in which said roller means is a single
roller and said strand means are trained in a common direction
about said roller.
8. The device of claim 7 in which said roller is formed with
separate peripheral grooves for the reception of said strand means,
respectively.
9. In combination, a first elongated member providing longitudinal
guide means, a second elongated member providing corresponding
longitudinal guide means, an intermediate element providing slide
means retentively associated with both guide means for relative
longitudinal movement only, a roller journalled on a transverse
axis on said intermediate element, and flexible strand means
anchored to said rails adjacent opposite ends thereof and tautly
trained about said roller to establish a driving connection
whereby, when one rail is held stationary and the other is moved in
either direction longitudinally, the intermediate element will be
moved in the same direction and at one-half the velocity.
10. A device of the class described comprising a first rail
providing two transversely-spaced, longitudinally parallel
channels, a second rail providing two transversely-spaced
longitudinally parallel channels, said channels of said second rail
being arranged in facing registry with the channels of said first
rail, an intermediate element 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 aligned with the spaces between the channels of said
rails, 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 flexible
strand means anchored to said rails adjacent opposite ends thereof
and tautly trained about said roller to establish a driving
connection whereby when one rail is held stationary and the other
is moved in either direction longitudinally, the intermediate
element will be moved in the same direction and at one-half the
velocity.
11. In combination, a first elongated rail, a second elongated
rail, an intermediate elongated member having retentive engagement
with both of said rails for relative longitudinal movement only,
abutment means carried by said intermediate member and facing away
from one end of said rails, flexible strand means anchored to said
one end of said first rail, trained about said abutment means and
tautly anchored to the corresponding end of said second rail,
abutment means carried by said intermediate member and facing away
from the other end of said rails, and flexible strand means
anchored to the other end of said first rail, trained about said
last-named abutment means and tautly anchored to the other end of
said second rail.
12. The combination of claim 11 in which each abutment means is a
roller mounted upon an axis disposed in the plane of travel of said
intermediate member and perpendicular to the line of travel
thereof.
13. The combination of claim 12 in which the axis of said first
roller is disposed adjacent that end of said intermediate member
which is remote from said one end of said rails when said member is
in its median position, and said second roller is disposed adjacent
the other end of said intermediate member.
14. The combination of claim 13 including cooperating stop elements
on said rails and on said intermediate member to limit relative
travel thereof to prevent any strand anchorage from reaching the
axis of the roller about which it is trained.
Description
This application relates to an improvement upon the invention
disclosed and claimed in the concurrently-filed application of
Herbert S. Fall, Willian D. York and Larry D. Huff, Ser. No.
152,258 for "Ball Bearing Slide with Synchronizing Mechanism".
The present invention 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, longer-lived means which is less
subject to attrition for ensuring the affirmative 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.
In the drawings:
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 and with
parts broken away for clarity of illustration;
FIG. 2 is a somewhat diagrammatic illustration of the two rails,
the intermediate element and the flexible strand means of the
present invention, illustrating the affirmative connection among
the three major elements of the system;
FIG. 3 is an enlarged, transverse section taken substantially on
the line 3--3 of FIG. 4;
FIG. 4 is an enlarged, fragmentary elevational view of a
mid-portion of the assembly, parts being broken away for clarity of
illustration;
FIG. 5 is a laterally-exploded end elevation of a slide structure
closely similar in many ways to that of FIGS. 1 to 3 but embodying
a modified form of synchronizing means;
FIG. 6 is a similarly-exploded, diagrammatic top plan view showing
the modified relationship of the rails, the intermediate member,
the rollers, the cables and cooperating stop means; and
FIG. 7 is an end elevation of a modified slide structure with which
may be combined either the synchronizing mechanism of FIG. 6 or
that of FIG. 2.
Referring more particularly to FIGS. 1-4, 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
affirmatively established.
As will be perceived from a careful examination of the drawings,
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 space 15 therebetween.
The channel elements 13 and 14 are spanned and joined by a
backplate 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 space 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
19. 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 ballbearing 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 space 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 that space while a similar stop bar (not shown) blocks the other
end thereof. 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 trackway 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 blocks 17 and 37 and their
analogues 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.
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,
highly effective and affirmative 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 means 66 so located as to register with the spaces 15 and 35
of the respective rails 10 and 11; and we tether the two rails to
each other by means of two cables, each of which is trained around
the roller means 66 in a manner later to be described in greater
detail. The roller is so mounted as to travel with the intermediate
element 12 and one advantageous arrangement is to mount the roller
upon the finger 65 of the bridge piece 56 in the manner fully
disclosed in the said copending application Ser. No. 152,258.
In one form of our invention, the roller 66 is a single element
formed with two axially-spaced, peripheral grooves 67 and 68. It
will be apparent, however, that we could use two separate rollers,
journalled on a common axis or upon separated axes, each being
formed with one of the grooves 67 or 68.
A cable 69 or other suitable flexible strand means may preferably
be formed with a bight 70 at each end thereof. One end of said
cable is anchored adjacent one end of the rail 10 by any suitable
means such as, for instance, one of the screws or rivets 72 which
secures the block 17 and passes through the bight at that end of
the cable 69. The cable is then trained about the roller 66, being
disposed in the groove 68 for guidance, and its opposite end 73 is
tautly anchored to the rail 11, for instance by passing one of the
screws or rivets 74 through the bight of the cable end 73.
Similarly, a second cable 75 has one end 76 anchored near the
opposite end of the rail 10, is then trained about the roller 66,
being disposed in the groove 67, and its other end 77 is anchored
near the corresponding end of the rail 11.
Referring to FIG. 2 and assuming that the rail 10 is fixed to a
drawer frame or the like, while one side of the drawer is carried
by the rail 11, it will be seen that, if the rail 11 is moved
toward the right relative to the rail 10, the lower run of the
cable 75 will be elongated while the upper run of that cable will
be shortened, whereby the roller 66 will be rotated in a
counterclockwise direction and the roller, and consequently the
intermediate element 12, will be bodily moved toward the right at
one-half the velocity of movement of the rail 11. At the same time,
of course, the lower run of the cable 69 will be shortened while
the upper run thereof will be correspondingly lengthened.
Quite apparently, if the movement of the rail 11 is reversed, the
intermediate member will be moved to the left at one-half the
velocity of the moving rail 11. In the first instance, the cable 75
is the active driver for the intermediate element 12 while the
cable 69 acts to restrain the intermediate element against
overtravel; and in the second instance, the cable 69 is the active
element and the cable 75 is the restrainer.
It will also be apparent that, if the assembly is used in a table
structure wherein the intermediate element 12 is fixed to a table
frame, the rail 10 carries a leaf at one end of the table and the
rail 11 carries a leaf at the opposite end of the table, forcible
movement of one leaf and its rail in one direction will cause a
responsive movement of the other leaf in the opposite direction and
to the same extent.
Because the cables 69 and 75 are of constant length, those cables
will remain always taut and a balanced relationship among the three
major elements of the assembly will be continuously maintained.
While the structure just described has been found to be a
significant improvement over previously known slide structures, we
presently believe that the form of our invention illustrated in
FIGS. 5 and 6 is preferred in that it provides for an increased
degree of extension in any given size of assembly, is more easily
assembled and includes certain safety features over the structure
illustrated in FIGS. 1 to 4.
The rail 80 is very much like the rail 10, the second rail 81 is
very much like the rail 11 and the intermediate element 82 is very
much like the intermediate element 12 of FIg. 1. The rail 80
includes a channel or guideway 13 and a parallel channel 14 joined
by a backplate 16. The channel 13 is formed with curled lips 18 and
20 defining trackways 19 and 21; and the channel 14 is formed to
provide curled lips 22 and 24 defining trackways 23 and 25. The
series of ball bearings 27 and 28 are retentively received in the
trackways 19 and 21, respectively and the balls 30 and 31 are
retentively received in the trackways 23 and 25, respectively.
The rail 81 comprises channels 33 and 34 joined by a backplate 36.
The channel 33 is formed with curled lips 38 and 40 defining
trackways 39 and 41, and the channel 34 is formed with curled lips
42 and 44 defining trackways 43 and 45. Balls 47 are retentively
received in the trackway 39, balls 48 are retentively received in
the trackway 41, balls 50 are retentively received in the trackway
43 and balls 51 are retentively received in the trackway 45.
The intermediate element 82 is made up of bars 52, 53 arranged back
to back and bars 54, 55 arranged back to back, said bars being
secured to a bridge piece similar to the bridge piece 56 but formed
to provide two longitudinally-separated axles 83 and 84 upon which
are respectively journalled peripherally grooved rollers 85 and
86.
Each of the bars 52, 53, 54 and 55 is formed to provide at its
opposite edge longitudinal lips 57 and 58 defining trackways 59 and
60 for retentively receiving the series of balls, for instance 27
and 28, with which that bar is associated.
A first cable 87 has one end anchored near the end 88 of the rail
80, is trained about that roller 85 which is journalled on the axle
83 which is more remote from the rail end 88 when the intermediate
element is in its median position, and has its opposite end tautly
anchored adjacent the corresponding end 89 of the rail 81.
Similarly, a cable 90, or other equivalent flexible strand means,
has one end anchored near the end 91 of the rail 80, is trained
around the roller 86 and has its opposite end tautly anchored
adjacent the end 92 of the rail 81.
It will be perceived that, since the cable 87 is longer than it
would be if the roller 85 were journalled substantially at the
center of length of the intermediate element 82, and since the
cable 90 is longer than it would be if the roller 86 were
journalled substantially at the center of length of the said
intermediate element, the total extension of the assembly of FIG. 6
is significantly increased.
In order to avoid separation of either of the rails 80 and 81 from
the intermediate element 82, even in case of breakage of one of the
cables 87 or 90, we provide a series of cooperating stop members on
the rails and on the intermediate element. Thus, a stop 93 is
located at the end 89 of the rail 81 and in interfering
relationship to a stop 94 fixed to the intermediate element 82.
Correspondingly, a stop 95 is fixed to the intermediate element 82
in interfering relationship to a stop 96 secured to the end 91 or
the rail 80. When the parts are in fully-collapsed positions, the
longitudinal distance between the stops 93 and 94 is the same as
the longitudinal distance between the stops 95 and 96; and, as the
rail 81 is moved upwardly as viewed in FIG. 6 while the rail 80 is
held stationary, the intermediate element 82 will move in the same
direction, but at half the velocity of the rail 81 so that, as the
stop 95 approaches the stop 96 will engage 96, the stop 93 will
approach the stop 94 at the same rate. Thus, the stop 95 will
engage the stop 96 simultaneously as the stop 93 engages the stop
94.
Equivalently, a stop 97 is fixed to the end 92 of the rail 81 in
interfering relationship with a stop 98 secured to the intermediate
element 82, but in non-interfering interfering relationship with
the stop 94. A stop 99 is secured to the intermediate element 82 in
interfering relationship with the stop 100 secured to the end 88 of
the rail 80, but in non-interfering relationship to the stop 96.
Thus, if the rail 80 is held stationary while the rail 81 is moved
downwardly as viewed in FIg. 6, the stop 99 will approach the stop
100 at the same rate at which the stop 97 approaches the stop 98
and stop 99 will engage stop 100 simultaneously as the stop 97
engages the stop 98.
In FIG. 7, we have shown a modified form of ball bearing slide rail
assembly. In this form, a first rail, indicated generally by the
reference numeral 110, comprises a channel 113 and a channel 114
secured together in parallelism by a backplate 116. A second rail,
indicated generally by the reference numeral 111, comprises a bar
203, a parallel bar 205 and a backplate 166 spanning and joining
said bars. An intermediate element 113 comprises a bar 152 secured
back-to-back to a channel 163, a bar 154 secured back-to-back to a
channel 164 and a bridge piece 156 interposed between, spanning and
secured to, the bar and channel pair 152, 163 and the bar and
channel pair 129, 164. A ball bearing cage 126 with ball series 127
and 128 retentively connects bar 152 to the channel 113 for
longitudinal movement only relative thereto and a ball bearing cage
129 with ball series 130 and 131 retentively connects the bar 154
to the channel 114 for longitudinal movement only relative
thereto.
Similarly, a ball bearing cage 176 with balls 177 and 178 and a
ball bearing cage 179 with ball bearings 180 and 181 retentively
connect the rail 111 to the intermediate element 113 for
longitudinal movement only relative thereto.
As shown, rollers 85 and 86 are mounted on the bridge piece 156 in
the relationship discussed in describing FIGS. 5 and 6, and cables
87 and 90 provide the same kind of driving connection among the
three major elements of the slide structure.
It will be apparent that the slide structure of FIG. 7 provides
stronger resistance to the moment impressed upon the slide
structure when the structure is extended than is provided by the
structure of FIG. 1 or FIG. 5. It will also be apparent that
additional units may be readily added to the assembly of FIG. 7 to
provide for still greater extension. That is, if the solid
backplate 166 is replaced by a bridge piece like the element 156, a
pair of channels like the channels 163 and 164 may be welded to
that additional bridge piece and an additional pair of bars like
the bars 203 and 205, with their associated ball bearings cages can
be retentively engaged in the additional channels.
While several preferred embodiments of our invention have been
illustrated and described in detail, it will be apparent that many
of its advantageous results can be achieved by different means. For
instance, it would be possible to eliminate the roller means
completely by simply rounding and smoothing the mutually-facing
edges of the legs 62 and 63, as shown in FIG. 4, training the cable
69 about the leg 62 and the cable 75 about the leg 63 and
permitting the cables to slide around the rounded leg edges. Or
separate roller means, on separated axes, might be provided with
the respective cables 69 and 75 trained about the respective
rollers nearer their anchorages. Alternatively, the roller means
might be sprockets and the cables might be replaced by chains,
meshing with the sprockets. The essential requirement is that there
shall be two flexible strands, each trained about abutment means
carried by the intermediate element, and providing a driving
connection among the three major elements such that, when one rail
is moved in either direction while the other is held stationary,
the intermediate element will be driven in the same direction but
at one-half the velocity.
* * * * *