U.S. patent application number 13/306186 was filed with the patent office on 2012-03-29 for cable management panel with sliding drawer and methods.
This patent application is currently assigned to ADC Telecommunications, lnc.. Invention is credited to Kathleen M. Barnes, Joel B. Douglas, Michael J. Franklin, Lonnie E. Hannah, Trevor D. Smith, Steven P. Trebesch.
Application Number | 20120076466 13/306186 |
Document ID | / |
Family ID | 25412575 |
Filed Date | 2012-03-29 |
United States Patent
Application |
20120076466 |
Kind Code |
A1 |
Douglas; Joel B. ; et
al. |
March 29, 2012 |
CABLE MANAGEMENT PANEL WITH SLIDING DRAWER AND METHODS
Abstract
An optical fiber cable management panel includes drawer
assemblies, each including a drawer slidable within a chassis. The
drawer assemblies are secured together by a bracket that includes
an interlock arrangement with the chassis. Such an interlock
arrangement includes a non-threaded stud engaging a hole. Radius
limiters may be part of the drawer assembly and include a cable
entry aperture have a closed perimeter and a flared cable guide
surface around most of, and preferably all of, the closed perimeter
to allow for the entry of cables from all directions. A control
mechanism controls movement of the radius limiter relative to the
drawer assembly. The control mechanism includes a rotating member
that has an axis of rotation transverse to the slidable motion of
the radius limiter and normal to the radius limiter.
Inventors: |
Douglas; Joel B.;
(Hutchinson, MN) ; Barnes; Kathleen M.; (Golden
Valley, MN) ; Franklin; Michael J.; (Apple Valley,
MN) ; Hannah; Lonnie E.; (Monticello, MN) ;
Smith; Trevor D.; (Eden Prairie, MN) ; Trebesch;
Steven P.; (Eagan, MN) |
Assignee: |
ADC Telecommunications,
lnc.
Eden Prairie
MN
|
Family ID: |
25412575 |
Appl. No.: |
13/306186 |
Filed: |
November 29, 2011 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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12655363 |
Dec 28, 2009 |
8078029 |
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13306186 |
|
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|
12316799 |
Dec 15, 2008 |
7664362 |
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12655363 |
|
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|
|
12148142 |
Apr 15, 2008 |
7480438 |
|
|
12316799 |
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|
11799010 |
Apr 30, 2007 |
7373071 |
|
|
12148142 |
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11349687 |
Feb 8, 2006 |
7231125 |
|
|
11799010 |
|
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|
09900465 |
Jul 6, 2001 |
7079744 |
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|
11349687 |
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Current U.S.
Class: |
385/135 |
Current CPC
Class: |
Y10T 29/49826 20150115;
G02B 6/4452 20130101; G02B 6/4478 20130101; G02B 6/4455 20130101;
G02B 6/4459 20130101 |
Class at
Publication: |
385/135 |
International
Class: |
G02B 6/44 20060101
G02B006/44 |
Claims
1. A cable management assembly, comprising: a) a chassis; b) a
drawer having a sidewall-free construction; c) a slide that
provides a sliding interconnection between the drawer and the
chassis; d) a radius limiter having a bell-mouth portion that leads
into a curved cable trough; and e) a control mechanism that
provides synchronized movement of the radius limiter relative to
the drawer.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of application Ser. No.
12/655,363, filed Dec. 28, 2009, which is a continuation of
application Ser. No. 12/316,799, filed Dec. 15, 2008, now U.S. Pat.
No. 7,664,362, which is a continuation of application Ser. No.
12/148,142, filed Apr. 15, 2008, now U.S. Pat. 7,480,438, which is
a continuation of application Ser. No. 11/799,010, filed Apr. 30,
2007, now U.S. Pat. 7,373,071, which is a continuation of
application Ser. No. 11/349,687, filed Feb. 8, 2006, now U.S. Pat.
7,231,125, which is a continuation of application Ser. No.
09/900,465, filed Jul. 6, 2001, now U.S. Pat. No. 7,079,744, which
applications are incorporated herein by reference in their
entirety.
TECHNICAL FIELD
[0002] This disclosure concerns management of optical fiber cables.
In particular, this disclosure relates to storage of optical fiber
cables and devices in the telecommunications industry.
BACKGROUND OF THE INVENTION
[0003] Cable termination, splice, and storage devices are known
including, for example, devices shown in U.S. Pat. Nos. 4,792,203
and 5,946,440, both assigned to ADC Telecommunications, Inc. Both
of these patents concern devices with movable trays for storage and
management of the optical fiber cables. U.S. Pat. No. 5,066,149,
also assigned to ADC Telecommunications, concerns a cable
management device including slidable drawers, each including a
cable slack take-up mechanism.
[0004] When moving the trays or drawers, unnecessary or excessive
displacement of the optical fiber cables is undesirable. As the
optical fiber cables are displaced, they are subject to bending and
other forces. Bending of the fibers can cause attenuation and loss
of signal strength. As the fiber bends, the fiber can also break,
resulting in a loss of transmission through the fiber. Improvements
are desirable.
SUMMARY OF THE INVENTION
[0005] In one aspect, the disclosure describes a radius limiter for
an optical fiber cable management panel. The radius limiter
includes a frame piece having a vertically oriented curved wall and
a trough section adjacent to the curved wall. A cover member is
oriented at least partially over the trough section. The cover
member and the frame piece define a cable entry aperture having a
closed perimeter. The cable entry aperture is in communication with
the trough section to permit cables to enter through the aperture
and rest within the trough section. Further, at least 75% of the
perimeter of the cable entry aperture is circumscribed by a flared
cable guide surface.
[0006] A method of limiting a radius of optical fiber cables is
provided and includes directing optical fiber cables through a
cable entry aperture and against a flared cable guide surface of a
cover. The cover is oriented at least partially over a trough
section of a frame piece that is part of a radius limiter.
[0007] In another aspect, this disclosure concerns an optical fiber
cable management system including at least first and second drawer
assemblies. Each of the drawer assemblies includes a chassis and a
drawer slidably mounted within the chassis. A mounting bracket is
provided to connect together the first drawer assembly and the
second drawer assembly through an interlock arrangement. The
mounting bracket also is usable to connect together more than two
drawer assemblies. The interlock arrangement includes non-threaded
stud members and holes sized for receiving the non-threaded stud
members.
[0008] A method of connecting a first drawer assembly to a second
drawer assembly includes securing a bracket to the chassis of the
first drawer assembly and the chassis of the second drawer assembly
by inserting a non-threaded stud arrangement into an aperture
arrangement.
[0009] In another aspect, this disclosure is directed to an optical
fiber cable management panel including a drawer assembly, including
a drawer slidably mounted within a chassis, a cable radius limiter
slidably mounted relative to the drawer assembly, and a control
mechanism secured to the drawer assembly to synchronize slidable
movement of the cable radius limiter relative to slidable movement
of the drawer within the chassis. The control mechanism includes a
rotating member oriented to rotate between the drawer and the
chassis. The rotating member has an axis of rotation that is
transverse to a direction of slidable movement of the cable radius
limiter.
[0010] A method for controlling slidable movement of a cable radius
limiter relative to slidable movement of a drawer within a chassis
includes rotating a wheel, secured to the cable radius limiter,
between the drawer and the chassis. The wheel has an axis of
rotation that is oriented normally to the cable radius limiter.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 is a perspective view of a cable management panel,
depicting two drawers and without tray inserts;
[0012] FIG. 2 is a perspective view of a radius limiter utilized in
the cable management panel depicted in FIG. 1;
[0013] FIG. 3 is a top plan view of the radius limiter depicted in
FIG. 2;
[0014] FIG. 4 is a front elevational view of the radius limiter
depicted in FIG. 2;
[0015] FIG. 5 is a right side elevational view of the radius
limiter depicted in FIG. 2;
[0016] FIG. 6 is a perspective view of a cover utilized on the
radius limiter of FIG. 2 and showing a cover on the radius limiter
pivoted to allow access to a trough in the radius limiter;
[0017] FIG. 7 is a top plan view of a cover for the radius limiter
depicted in FIG. 2;
[0018] FIG. 8 is a front elevational view of the cover depicted in
FIG. 7;
[0019] FIG. 9 is a right elevational view of the cover depicted in
FIG. 7;
[0020] FIG. 10 is a side elevational view of the cable management
panel depicted in FIG. 1;
[0021] FIG. 11 is a schematic, partially cross-sectional view of
the cable management panel depicted in FIG. 1, the cross-section
being taken along the line 11-11 of FIG. 10;
[0022] FIG. 12 is a perspective view of a bracket utilized to
secure together the drawers of the cable management panel depicted
in FIGS. 1 and 10;
[0023] FIG. 13 is a top plan view of a chassis that is part of a
drawer assembly utilized in the cable management panel depicted in
FIG. 1;
[0024] FIG. 14 is a perspective view of the chassis of FIG. 13;
[0025] FIG. 15 is a perspective view of the cable management panel
depicted in FIG. 1, and with one of the drawers in a fully open
position and with one drawer in a partially open position;
[0026] FIG. 16 is a side elevational view of the cable management
panel depicted in FIG. 15, and with a portion broken away to show
internal components;
[0027] FIG. 17 is an exploded, perspective view of one of the
drawer assemblies depicted in FIG. 15;
[0028] FIG. 18 is a top plan view of the cable management panel
depicted in FIG. 15;
[0029] FIG. 19 is a schematic, cross-sectional view of the cable
management panel taken along the line 19-19 of FIG. 18;
[0030] FIG. 20 is a perspective view of a wheel bracket utilized in
the cable management panel depicted in FIGS. 1 and 15-19; and
[0031] FIG. 21 is a side elevational view of the wheel bracket
depicted in FIG. 20.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0032] A cable management panel or module is depicted in FIG. 1
generally at 30. In the one shown, the panel 30 includes a
plurality of drawer assemblies 32. In the one shown in FIG. 1, the
panel 30 includes two drawer assemblies 32. Each of the drawer
assemblies 32 includes a chassis 34 and a drawer 36 slidably
mounted within the chassis 34.
[0033] Each drawer 36 may include cable management structure, for
example, devices for storing the cables or connecting the cables to
other cables or fiber optic devices, such as attenuators, couplers,
switches, wave division multiplexers, splitters or splices. Drawers
36 are slidable relative to chassis 34 by way of two drawer slides
38 on opposite sides of the chassis 34. Each drawer 36 includes two
latches 40 to secure the drawer 36 in a closed position (the
position shown in FIG. 1).
[0034] Each drawer 36 includes a base 42, a front wall 44 and a
rear wall 46. Note that the drawer 36 is absent of side walls, or
is "side wall-free." This structure allows for cable entry and exit
and prevents cable damage during sliding movement of the drawers 36
when accessing the cables and connectors or other devices in the
drawer 36. The base 42, front wall 44 and rear wall 46 together
define a storage interior 48 for holding and storing the
cables.
[0035] Each storage interior 48 is sized for receiving cable
management and/or distribution structures. When the drawer 36 is in
the closed position, the cables and management or distribution
structures in the storage interior 48 are protected. In preferred
embodiments, the distribution structures can be conveniently
mounted on a tray insert that drops into the storage interior 48.
This allows for convenient structuring of the drawer 36 to serve
one or more desired functions in the panel 30. Examples of tray
inserts are described in co-pending and commonly assigned U.S.
patent application Ser. No. 09/649,398, which is a
continuation-in-part of application Ser. No. 09/490,379 (also
co-pending and commonly assigned), each of which is incorporated by
reference herein. In the preferred embodiment illustrated, each of
the drawers 36 is constructed to be stackable and linkable to form
sub-cable management panels 31. Such modularity also allows for
ease of use for a variety of different needs for the cable
management system. As can be seen in FIG. 1, a bracket 50 is used
to link each of the drawer assemblies 32 together. A perspective
view of one preferred embodiment of the bracket 50 is illustrated
in FIG. 12
[0036] In prior arrangements, mounting brackets were attached to
the side chassis with each drawer with several screws, for example,
#4-40 UNC screws. It was found that if drawers connected together
in this manner were dropped, the bracket would become loose from
the drawers, leading to wobble between drawers in a multiple drawer
assembly. Further, when the drawers would be opened, there
sometimes would be rubbing and scraping if the drawers were loose
from the bracket. The bracket 50, as described herein, addresses
these problems.
[0037] In particular, the mounting bracket 50 connects together
each of the drawer assemblies 32 through an interlock arrangement
52. In preferred embodiments, the interlock arrangement 52 includes
at least one, and preferably a plurality, of non-threaded stud
members 54 located in one of the mounting bracket 50 and the
chassis 34. Further, the interlock arrangement 52 includes at least
one, and preferably a plurality, of apertures or holes 56 sized for
receiving the non-threaded stud members 54. The plurality of holes
56 are defined by the other of the mounting bracket 50 and the
chassis 34.
[0038] In the particular embodiment illustrated, the interlock
arrangement 52 includes two non-threaded stud members 54 projecting
from the chassis 34 (see FIGS. 13-14). The stud members 54 may be
formed from the chassis 34 itself (by punching or forming), or may
be independent members permanently secured to the chassis 34. In
this illustrated embodiment, the interlock arrangement 54 includes
at least 4 holes being defined by the mounting bracket 50,
receiving each of the non-threaded stud members 54 of each of the
chassis 34. These holes 56 are visible in FIGS. 10 and 12.
[0039] In general, the bracket 50 includes first and second
mounting plates 60, 61 arranged generally orthogonal to each other.
The first mounting plate 60 is utilized for securing each of the
chassis 34 together. The second mounting plate 61 is used to mount
each of the drawer assemblies 32 together along other framework,
typically together with other cable management panels 30. Each of
the holes 56 is defined by and extends completely through the first
mounting plate 60. The first mounting plate 60 also includes
several more holes 62 for accommodating screws 64, as used in prior
arrangements, to help secure each of the drawer assemblies 32
together to the bracket 50.
[0040] The chassis 34 is illustrated in FIGS. 13 and 14. It can be
seen that each chassis generally is an L-shaped frame piece 66 and,
in addition to the non-threaded studs 54 projecting from the frame
piece 66, defines a plurality of holes 68 for accommodating the
screws 64.
[0041] FIG. 11 is a cross-sectional view illustrating the bracket
50 secured to one of the chassis 34. Two of the studs 54 can be
seen in cross-section extending through two of the holes 56. This
interlock arrangement 52 provides the cable management panel 30
with more strength and rigidity than prior arrangements that
utilized screws. The interlock arrangement 52 helps to absorb the
impact and thrust loading created by a drop scenario, by vibration,
or by an earthquake.
[0042] While non-threaded stud members 54 are illustrated in the
preferred embodiment, it should be understood that, in alternate
arrangements, pins may also be used. Further, in other embodiments,
the interlock arrangement 52 may include a tab/slot arrangement,
where a tab projects into and is bent over a slot.
[0043] Preferably, each of the drawer assemblies 32 includes a
take-up mechanism 70 to manage optical fibers entering and exiting
the cable management panel 30. In the preferred embodiment
illustrated, each take-up mechanism 70 includes a push member or
radius limiter 72. In reference now to FIG. 2, one preferred
embodiment of radius limiter 72 is illustrated in perspective view.
In the preferred one shown, the radius limiter 72 includes a frame
piece 74. The frame piece 74 includes a vertically oriented curved
wall 76 and a trough section 78 adjacent to the vertically curved
wall 76. In particular, the trough section 78 is defined by a
second vertically oriented wall 80 and a base 82 that bridges the
vertically oriented wall 80 and the curved wall 76 (see FIG. 3). As
can be seen in FIGS. 2 and 3, the curved wall 76 is concavely
shaped relative to the trough section 78. As can also be seen in
FIG. 3, the trough section 78 also has a curved shape. In preferred
embodiments, the curved shape of the trough section 78 is on a
radius of about 1.25-2 in.
[0044] Still in reference to FIG. 2, the preferred radius limiter
72 shown includes a cover member 84. Preferably, the cover member
84 is oriented at least partially over the trough section 78. The
cover member 84 and the frame piece 74 define a cable entry
aperture 86 that is in communication with the trough section 78 to
permit cables to enter through the aperture 86 and rest within the
trough section 78.
[0045] The cable entry aperture 86 defines a closed perimeter 88.
By "closed perimeter", it is meant that the border that forms the
aperture 86 is at least 90%, preferably 100%, closed to form a
continuous, uninterrupted boundary. In the preferred embodiment
illustrated, at least 75%, preferably at least 95%, and in most
preferred embodiments, 100% of the perimeter 88 of the cable entry
aperture 86 is circumscribed by a flared cable guide surface 90.
The flared cable guide surface 90 preferably takes the form of a
smooth, contour 92, such that the cable entry aperture 86 has the
appearance of a trumpet flare or a bell-mouth 94. The smooth
contour 92 preferably is bent on a radius of about 0.25-0.75 in.
The flared cable guide surface 90 helps to protect cables entering
the cable entry aperture 86 and prevents such cables from bending
too sharply and possibly losing some light transmission.
[0046] As can be seen particularly in FIGS. 2 and 5, the preferred
embodiment has the entire perimeter 88 of the cable entry aperture
86 to include the flared cable guide surface 90. When shaped in
this manner, the cable entry aperture 86 protects cables entering
from any direction, including from a direction vertically above the
radius limiter 72.
[0047] In reference now to FIGS. 6-9, features of the cover member
84 are defined. Preferably, the cover member 84 includes a finger
96. The finger 96 includes an extension 97 that defines a first
free edge 98 and a second free edge 99. A stem 102 extends between
the extension 97 and an attachment portion 104. As can be seen in
FIGS. 6-9, the first free edge 98 defines a portion of the flared
guide surface 90. The second free edge 99 selectively engages the
vertically oriented wall 76 of the frame piece 74 through a latch
arrangement 106 (FIGS. 2 and 4). Preferably, the latch arrangement
106 includes a hook and projection arrangement 108, where a hook
from one of the finger 96 and frame piece 74 engages a projection
from the other of the finger 96 and frame piece 74. In the
particular arrangement illustrated, the latch arrangement 106
includes the finger 96 having a hook 110 defining an aperture 111,
through which a projection 112 extending or projecting from the
vertically oriented curved wall 76 of the frame piece 74 is
defined. As can be appreciated, the latch arrangement 106 permits
the finger 96 to be releasably secured to the frame piece 74.
Together with the attachment portion 104, explained below, this
latch arrangement 106 permits the finger 96 to be selectively moved
from, and pivoted at the attachment portion 104, from the frame
piece 74 to permit the installation of cables through the cable
entry aperture 86 and into the trough section 78.
[0048] The attachment portion 104 helps to pivotally secure the
finger 96 to the frame piece 74. In reference to FIGS. 6 and 8, in
the preferred embodiment, the attachment portion 104 includes a
pair of extruding tabs 114, 116, projecting from the extension 97.
The tabs 114, 116 are snapped around a member 75 within the frame
piece 74 of the radius limiter 72 in a manner which allows the
frame piece 74 to securely hold the finger 96 and permit the finger
96 to be selectively pivoted away from and then back toward the
trough section 78 (see FIG. 6), along a hinge point 118.
[0049] The latch arrangement 106 provides for a secure interlock
between the finger 96 and the frame piece 74 to prevent unintended
bending away of the finger 96 from the frame piece 74 if fibers or
cables tend to pull it up during manipulation of the drawer
assembly 32. In preferred embodiments, the hinge point 118 permits
selective lifting of the cover member 84 away from remaining
portions of the radius limiter 72 to facilitate fiber loading.
[0050] The cover member 84 may also include a second finger 100
(FIGS. 11 and 18). Finger 100, in the one shown, is oriented
generally at a right angle to the finger 96 and is pivotally
mounted relative to the frame 74. Finger 100 also helps to hold the
cables in place within the radius limiter 72.
[0051] To load cable or fiber into the radius limiter 72, the latch
arrangement 106 is released to allow the finger 96 to be moved
relative to the frame 74. The finger 96 is pivoted about the hinge
point 118 that defines a gap or space through which the cable may
enter. If present, the second finger 100 is also pivoted away from
the frame 74. The cable is then oriented and rested within the
trough section 78. The finger 96 is again oriented against the
frame piece 74 to close the gap or space, and the latch arrangement
106 is secured by having the projection 112 extend into the
aperture 111 of the hook 110. If present, the second finger 100 is
returned against the frame 74. If cable is being directed from a
position above the radius limiter 72, the cable is resting against
the flared cable guide surface 90 defined by the first free edge 98
of the finger 96. As described above, the flared cable guide
surface 90 helps to prevent the cable from bending too sharply.
Further, as explained above, the shape of the trough section 78
also controls the radius of the cable and prevents it from bending
too sharply.
[0052] The radius limiter 72 is preferably slidably mounted
relative to the drawer assembly 32. Movement of the radius limiter
72 is controlled with synchronized movement with the drawer 36 to
ensure that the cables do not bend too sharply when the drawer 36
is being opened or closed relative to the chassis 34. If the cables
were bent too sharply, this may cause loss of signal strength or
loss of transmission. Preferably, the cable management panel 30
includes a control mechanism 125 (FIGS. 15-19) that is secured to
the drawer assembly 32 to synchronize slidable movement of the
cable radius limiter 72 relative to slidable movement of the drawer
36 within the chassis 34. In particular, the control mechanism 125
includes a rotating member 126, such as a roller or wheel 128.
Preferred wheels 128 will include a compressible ring 129 (FIG. 17)
that circumscribes the wheel 128 to help provide for a smooth
interface and introduce some friction for smooth operation.
[0053] Preferably, the wheel 128 is oriented to rotate between the
drawer 36 and the chassis 34. In most preferred embodiments, the
wheel 128 has an axis of rotation 130 that is transverse to a
direction of slidable movement of the cable radius limiter 72. This
is illustrated in FIG. 16. In FIG. 16, the direction of slidable
movement of the cable radius limiter 72 is shown at arrow 132. In
the particular orientation shown in FIG. 16, this direction 132 is
a horizontal direction. It is also the direction that corresponds
to the slidable motion of the drawer 36 relative to the chassis 34.
The axis of rotation 130 extends, in the particular orientation
shown in FIG. 16, in a vertical direction, that is, the direction
transverse to the direction 132 of slidable movement of the radius
limiter 72. Also, in the example illustrated, the axis of rotation
130 is normal (i.e., perpendicular) to the radius limiter 72. By
having the wheel 128 rotate about axis 130, which is a direction
transverse to the motion of the radius limiter 72 and normal to the
radius limiter 72, there is a reduction in problems associated with
assembly during manufacturing. For example, in previous
arrangements, the wheel was oriented to have an axis of rotation
that extended parallel to the radius limiter 72. In these prior
arrangements, sheet metal flatness and parallelism had to be
carefully controlled because it was critical to wheel engagement.
Further, in these previous systems when the wheel had an axis of
rotation that was parallel to the radius limiter, there was an
issue with respect to tolerance stack up. Further, in prior
systems, the wheels would push the drawer and its components
upwards towards the drawer cover due to the orientation of the
wheel, which sometimes caused interference problems. By orienting
the wheel 128 with the axis of rotation 130 in the direction normal
to the radius limiter, many of these problems are addressed or
eliminated all together.
[0054] In reference now to FIGS. 20-21, in preferred embodiments,
the control mechanism 125 includes a bracket 134 having an axle
136. As can be seen in FIGS. 20 and 21, the wheel 128 is mounted
for rotation on the axle 136. The axle 136 is co-linear with and
defines the axis of rotation 130.
[0055] Still in reference to FIGS. 20-21, the preferred bracket 134
shown includes a projection arrangement 138 that allows the bracket
134 to be secured to the cable radius limiter 72. In particular,
the projection arrangement 138 includes a first projection 140 and
a second projection 142. Each of the first projection 140 and
second projection 142 includes a tab 144, 145 that extends or
projects into and locks with a suitable receiving aperture 146, 147
(FIG. 17) in the frame piece 74 of the radius limiter 72. In this
manner, the bracket 134 can be secured to the radius limiter 72,
and through an elongated slot 150 defined by the base 42 of the
drawer 36. The slot 150 allows for assembly of the radius limiter
72 to the drawer 36.
[0056] The bracket 134 also includes a catch 152 projecting from a
side and in a direction opposite to the direction that the
projection arrangement 138 projects. In the one shown, the catch
152 defines one end 154 of the bracket 134. Also, in the particular
embodiment illustrated, the first projection 140 forms an opposite
end 156 of the bracket 134. The catch 152 is selectively engaged
with a stop member 158 on the chassis 34. The catch 152 of the
bracket 134 selectively engages the stop member 158 when the drawer
36 and the radius limiter 72 are slid relative to the chassis 34.
This engagement prevents the drawer 36 from being totally separated
from the chassis 34 when sliding the drawer 36 from the chassis
34.
[0057] In reference again to FIG. 17, the chassis 34 was described
above as being an L-shaped frame piece 66. In particular, the
L-shaped frame piece 66 includes a base 160 that is located in a
plane generally parallel to the base 42 of the drawer, when the
drawer assembly 32 is in operable assembly, and a side wall 162
extending normal to the chassis base 160. This side wall 162
provides one of the surfaces against which the wheel 128
rotates.
[0058] Secured to the drawer 36 is a wheel guide 164. The wheel
guide 164 is a generally elongated structural member defining a
smooth guide surface 165. As can be seen in FIGS. 15 and 17, the
wheel guide 164 is adjacent to and generally parallel to the
elongated slot 150 in the drawer 36.
[0059] In operable assembly, the wheel 128 rotates about its axle
136 between and against the guide surface 165 of the wheel guide
164 and the chassis side wall 162. The location of the wheel 128
secured to the radius limiter 72 and between the drawer 36 and
chassis 34 allows the radius limiter 72 to move at one-half of the
speed of the movement of the drawer 36 relative to the chassis
34.
[0060] In reference again to FIG. 17, and as mentioned above, each
of the drawer assemblies 32 preferably includes drawer slide 38.
The drawer slide 38 is the type of slide that is described in U.S.
Pat. No. 5,209,572, which is incorporated by reference herein. In
general, the drawer slide 38 includes symmetrically identical
outside channel members 167, 168 for securing to the drawer 36 and
chassis 34, respectively. An inner retainer 169 slidably retains
ball bearings (not shown) that are trapped between the channel
members 168, 169. In operation, when the drawer 36 is moved
relative to the chassis 34, the channel member 167 slides relative
to the channel member 168 with the ball bearings rotating between
the retainer 169 and the channel members 167, 168 to help create
smooth, slidable motion.
[0061] When the drawer 36 is slid relative to the chassis 34, the
wheel 128 is rotated between the drawer 36 and chassis 34 (in
particular, between the wheel guide 164 and the side wall 162 of
the chassis 34), and the wheel 128 is rotated about the axis of
rotation 130 that is transverse to the direction of slidable
movement of the cable radius limiter 72, and that is oriented
normally to the radius limiter 72.
[0062] The above specification provides a complete description of
example embodiments of the invention. Many embodiments of the
invention can be made, according to principles described
herein.
* * * * *