U.S. patent application number 11/201475 was filed with the patent office on 2006-03-02 for electronic equipment rack.
This patent application is currently assigned to Cooper Technologies Company. Invention is credited to Eric R. Rinderer.
Application Number | 20060043031 11/201475 |
Document ID | / |
Family ID | 35941550 |
Filed Date | 2006-03-02 |
United States Patent
Application |
20060043031 |
Kind Code |
A1 |
Rinderer; Eric R. |
March 2, 2006 |
Electronic equipment rack
Abstract
A two-post electronic equipment rack of this invention is
adapted for holding telecommunication equipment and the like. The
rack comprises a structural frame including a base and a pair of
posts secured to the base and extending up from the base adjacent
opposite sides of the base. Each of the posts comprises
substantially vertical front and back tubular frame members having
a centerline spacing of less than about twelve in. The structural
frame also includes a plurality of cross braces connecting the
front and back tubular frame members of each of the two posts. A
plurality of substantially vertical equipment mounting rails not
constituting part of the structural frame are attached to the
structural frame for mounting the equipment on the rack.
Inventors: |
Rinderer; Eric R.;
(Highland, IL) |
Correspondence
Address: |
SENNIGER POWERS
ONE METROPOLITAN SQUARE
16TH FLOOR
ST LOUIS
MO
63102
US
|
Assignee: |
Cooper Technologies Company
Houston
TX
|
Family ID: |
35941550 |
Appl. No.: |
11/201475 |
Filed: |
August 11, 2005 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
60604939 |
Aug 26, 2004 |
|
|
|
Current U.S.
Class: |
211/26 ;
211/189 |
Current CPC
Class: |
H05K 7/186 20130101 |
Class at
Publication: |
211/026 ;
211/189 |
International
Class: |
A47F 7/00 20060101
A47F007/00 |
Claims
1. A two-post electronic equipment rack, comprising a structural
frame including a base and a pair of posts secured to the base and
extending up from the base adjacent opposite sides of the base,
each of said posts comprising substantially vertical front and back
tubular frame members having a centerline spacing of less than
about twelve in., said structural frame further comprising a
plurality of cross braces connecting the front and back tubular
frame members of each of said posts, and a plurality of
non-structural substantially vertical equipment mounting rails
attached to said structural frame for mounting said equipment on
the rack.
2. A rack as set forth in claim 1 wherein said mounting rails are
movable independent of the frame whereby during a seismic event the
mounting rails are adapted to move at a harmonic frequency
different from the harmonic frequency of said structural frame.
3. A rack as set forth in claim 1 wherein said structural frame
also includes a substantially horizontal front top frame member
connecting upper ends of the front tubular frame members and a
substantially horizontal back top frame member connecting upper
ends of the back tubular frame members, and wherein said plurality
of cross braces include a pair of upper cross braces at opposite
sides of the frame spaced below the upper ends of the front and
back tubular members for defining, in combination with said front
and back top frame members, a space sized and configured to receive
cable or a cable tray for holding cable extending across the rack
at a level at or below a top of the rack.
4. A rack as set forth in claim 1 wherein the rack has open sides,
an open front and an open back to permit routing of cable to and
from said equipment through said open sides, said open front and
said open back.
5. A rack as set forth in claim 4 wherein the rack has an open top
and an open bottom to permit routing of cable to and from said
equipment through said open top and bottom.
6. A rack as set forth in claim 1 wherein said base comprises a
front base frame member connecting lower ends of the front tubular
frame members, a back base frame member connecting lower ends of
the back tubular frame members, and a pair of side gussets
connecting respective front and back tubular frame members, said
side gussets having upright plate portions attached to respective
front and back tubular frame members and lower plate portions
underlying respective front and back base frame members.
7. A rack as set forth in claim 6 further comprising reinforcing
slabs overlying respective base frame members and respective lower
plate portions of the side gussets, said slabs, base frame members
and respective lower plate portions of the side gussets having
vertically aligned openings therein for receiving fasteners for
securing the rack to a floor.
8. A rack as set forth in claim 7 wherein the distance between a
center of one set of said vertically aligned openings and a
respective tubular frame member is about 2 in.
9. A rack as set forth in claim 7 wherein said base further
comprises a plurality of interior gussets above respective base
frame members, each interior gusset having an upright portion
attached to a vertical leg of a respective front or back base frame
member and a lower portion overlying a lower leg of a respective
front or back base frame member.
10. A rack as set forth in claim 9 wherein the lower portions of
said interior gussets are sandwiched between the lower legs of
respective base frame members and respective reinforcing slabs, and
wherein said lower portions of said interior gussets have openings
therein vertically aligned with openings in respective slabs,
respective lower legs of the base frame members, and lower plate
portions of respective side gussets for receiving said
fasteners.
11. A rack as set forth in claim 1 wherein said cross braces have a
vertical dimension greater than at least about 0.5 times the
horizontal distance between respective front and back tubular frame
members.
12. A rack as set forth in claim 1 wherein said tubular frame
members are generally rectangular in cross section, and wherein
said mounting rails comprise vertical angle bars secured to said
cross braces.
Description
BACKGROUND OF THE INVENTION
[0001] This invention relates generally to electronic equipment
racks, and particularly to such racks that are adapted to withstand
seismic events.
[0002] Racks for holding electronic equipment, such as
telecommunications equipment, come in various configurations. Some
racks, referred to as "two-post" racks, include a pair of upright
posts, one at each side of the rack. Other racks, referred to as
cabinets, include four upright posts, two toward the front of the
rack at opposite sides of the rack and two toward the back of the
rack at opposite sides of the rack. Typical cabinets have side
panels extending between the front and back posts at opposite sides
of the cabinet. Conventional two-post racks typically occupy less
space but they are not as effective in withstanding seismic events
absent substantial (and expensive) reinforcement. Cabinets, on the
other hand, are generally more durable during seismic activity but
consume large amounts of space, since the centerline spacing
between the front and back posts is typically greater than 18 in.
(e.g., 24-48 in.). There is a need, therefore, for an electronic
equipment rack that is sufficiently strong to withstand seismic
events yet relatively compact to conserve space.
SUMMARY OF THE INVENTION
[0003] Among the several objects of this invention may be noted the
provision of an improved two-post electronic equipment rack for
holding telecommunications equipment and the like; the provision of
such a rack which, in at least one embodiment, is designed to
withstand seismic events; the provision of such a rack which, in at
least one embodiment, is relatively compact to preserve space; the
provision of such a rack which, in at least one embodiment, is
relatively lightweight (e.g., about 100 lbs) yet capable of holding
a relatively heavy load of equipment (e.g., up to 1000 lbs); the
provision of such a rack which, in at least one embodiment, is
economical to manufacture; and the provision of such a rack which,
in at least one embodiment, permits cable to be conveniently routed
to and from the equipment on the rack.
[0004] In general, a two-post electronic equipment rack of this
invention comprises a structural frame including a base and a pair
of posts secured to the base and extending up from the base
adjacent opposite sides of the base. Each of the posts comprises
substantially vertical front and back tubular frame members having
a centerline spacing of less than about twelve in. The structural
frame further comprises a plurality of cross braces connecting the
front and back tubular frame members of each of the two posts. A
plurality of substantially vertical equipment mounting rails not
constituting part of the structural frame are attached to the
structural frame for mounting the equipment on the rack.
[0005] Other objects and features will be in part apparent and in
part pointed out hereinafter.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 is a perspective of one embodiment of a rack of this
invention;
[0007] FIG. 2 is an enlarged view of the upper left-hand corner of
the rack of FIG. 1;
[0008] FIG. 3 is a perspective of an upper portion of the rack
adapted to hold a cable tray (shown in phantom lines);
[0009] FIG. 4 is a perspective of a lower portion of the rack;
[0010] FIG. 5 is an enlarged view of the lower left-hand corner of
the rack of FIG. 4;
[0011] FIG. 6 is a view similar to FIG. 5 with the components used
to secure the rack to the floor exploded;
[0012] FIG. 7 is a front view of a top portion of the rack, a cable
tray supported by the rack being shown in phantom;
[0013] FIG. 8 is a perspective of a lower portion of a second
embodiment of a rack having interior gussets; and
[0014] FIG. 9 is a front view of the rack;
[0015] FIG. 10 is an enlarged view of the upper left-hand corner of
the rack of FIG. 9 showing weld locations;
[0016] FIG. 11 is an enlarged view of the lower left-hand corner of
the rack of FIG. 9 showing weld locations;
[0017] FIG. 12 is a section taken along line 12-12 of FIG. 11
showing weld locations;
[0018] FIG. 13 is a side view of the rack;
[0019] FIG. 14 is an enlarged view showing weld locations on a tab
of FIG. 13;
[0020] FIG. 15 is an enlarged view showing weld location on a cross
brace shown in FIG. 13; and
[0021] FIG. 16 is an enlarged view showing weld location on a front
gusset and on a back gusset shown in FIG. 15.
[0022] Corresponding parts are designated by corresponding
reference numbers throughout the several views of the drawings.
DETAILED DESCRIPTION
[0023] Referring to FIG. 1 of the drawings, one embodiment of a
two-post electronic equipment rack of this invention is designated
in its entirety by the reference numeral 1. In general, the rack 1
comprises a structural frame, generally indicated at 3, and a
plurality of non-structural substantially vertical equipment
mounting rails, each designated 5, attached to the structural frame
for mounting electronic equipment 9 on the rack. The electronic
equipment 9 illustrated in FIG. 1 is telecommunications equipment
(e.g., patch panels), but it will be understood that the rack 1 is
suitable for mounting other types of equipment as well.
[0024] The structural frame 3 includes a base, generally designated
11, and a pair of left and right posts, each generally designated
15, secured to the base and extending up from the base adjacent
opposite sides of the base. Each of the posts 15 comprises front
and back substantially vertical tubular frame members 15F, 15B. As
used herein, a frame member 15F, 15B is "substantially vertical" if
it is oriented at an angle of up to about twenty degrees off
vertical, it being understood that it may be desirable under some
circumstances to angle one or both frame members 15F, 15B relative
to one another so they converge in an upward direction. The front
and back tubular frame members 15F, 15B are said to comprise a
single "post" because the centerline spacing S between the two
frame members is relatively close, i.e., less than about 12 in
(FIG. 2). By way of example, the centerline spacing S may be about
8 in., although this dimension may vary. In the illustrated
embodiments, the tubular frame members 15F, 15B are generally
rectangular in cross section, but other cross sections are possible
(e.g., circular, square, triangular). Further, the tubular frame
members 15F, 15B may be formed with or without longitudinal seams.
In general, the tubular frame members 15F, 15B of a rack 1 of this
invention are more effective than open structural shapes such as
angle, channel or Z-shaped frame members in resisting torsional and
compressive forces, for example.
[0025] With particular reference to FIG. 3, the structural frame 3
also includes a substantially horizontal front top frame member 17F
connecting upper ends of the front tubular frame members 15F and a
substantially horizontal back top frame member 17B connecting upper
ends of the back tubular frame members 15B. In one embodiment these
frame members 17F, 17B are angle bars each having a vertical leg 19
secured to respective front and back faces of the front and back
tubular frame members 15F, 15B, and a horizontal leg 21 with
fastener openings 23 for securing additional structure to the frame
3 of the rack 1. Other configurations are possible.
[0026] The structural frame 3 further comprises a plurality of
cross braces 25 connecting the front and back tubular frame members
15F, 15B of each post 15 (FIG. 1). In the illustrated embodiment,
the tubular frame members 15F, 15B of each post 15 are connected by
four such cross braces 25, a lower brace adjacent the base 11, an
upper brace adjacent the upper ends of the frame members 15F, 15B,
and two braces spaced at intervals between the upper and lower
braces. It will be understood that the number of braces 25 may
vary. Each brace 25 may be generally channel-shaped, with a
relatively wide central web 27 and narrow upper and lower flanges
29 extending from the web (FIG. 2). Other configurations are
possible. For enhanced stability, each cross brace 25 desirably has
a vertical dimension or height D1 greater than at least about 0.5
times the horizontal distance D2 between respective front and back
tubular frame members 15F, 15B, more desirably greater than at
least about 0.75 times the horizontal distance D2, and even more
desirably greater than at least about 0.80 times the horizontal
distance D2. By way of example, where D2 is 12 in., D1 may be 9.6
in, and where D2 is 4.0 in., D1 may be 3.2 in. The cross braces 25
have openings 31 therein, e.g., horizontal rows of fastener holes,
the function of which will become apparent.
[0027] Referring again to FIG. 3, the upper cross braces 25 at
opposite sides of the frame 3 are spaced below the upper ends of
the front and back tubular frame members 15F, 15B for defining, in
combination with the front and back top frame members 17F, 17B, a
channel space 33 sized to receive cable or a cable tray 35 for
holding cable extending across the rack at a level at or below a
top of the rack 1. By way of example, a wire basket-type cable tray
35 is shown in phantom. Other types of cable tray may be used.
[0028] With reference to FIGS. 4-6, the base 11 comprises a front
base frame member 37F connecting lower ends of the front tubular
frame members 15F, and a back base frame member 37B connecting
lower ends of the back tubular frame members 15B. In the
illustrated embodiment, each of these base frame members 37F, 37B
comprises a substantially vertical upper leg 39 having opposite
ends which overlap and are secured to respective tubular frame
members 15F, 15B, as by welding, and a substantially horizontal
lower leg 41 extending from the lower edge of the upper leg in a
direction away from the center of the rack 1. A horizontal flange
43 extends from the upper edge of the vertical leg 39 in a
direction opposite the lower leg 41, i.e., toward the center of the
rack. The horizontal flanges 43 have lengths generally
corresponding to the side-to-side spacing between the tubular frame
members 15F, 15B, so that the ends of the flanges are closely
adjacent respective tubular members. In one embodiment, each base
frame member 37F, 37B is formed from a single piece of sheet metal
bent into the desired shape, but the frame member may be fabricated
from multiple pieces. Other shapes are possible as well. The area
between the vertical legs 39 of the front and back base frame
members 37F, 37B is substantially open (i.e., the rack has no
bottom or a largely open bottom between the front and back base
frame members) so that cable may be routed to and from the
equipment 9 through this open area at the lower end of the rack 1.
Holes 45 are also provided in one or both of the vertical legs 39
of the base frame members 37F, 37B for installation of electrical
devices (e.g., outlets).
[0029] The base 11 also includes a pair of side gussets 47 at
opposite sides of the rack connecting respective front and back
tubular frame members 15F, 15B. In one embodiment, the side gussets
47 have quadrilateral upright plate portions 49 attached (e.g.,
welded) to respective front and back tubular frame members 15F, 15B
and rectangular lower plate portions 51 underlying the lower legs
41 of the front and back base frame members 37F, 37B. Horizontal
flanges 53 are provided along the upper edges of the upright plate
portions 49 of the gussets 47. As best illustrated in FIGS. 5 and
6, these flanges 53 have lengths generally corresponding to the
spacing between the front and back tubular frame members 15F, 15B
and depths (widths) such that the flanges terminate at or close to
the webs 27 of respective lower cross braces 25. Holes 55 are
provided in the upright plate portions 49 of the gussets 47 for
routing cable to and from the equipment 9 on the rack 1.
[0030] The base 11 also includes washers 58 and reinforcing slabs
57 (e.g., 0.5 in. thick metal slabs) overlying the lower legs 41 of
respective base frame members 37F, 37B and the lower plate portions
51 of respective side gussets 47 (see FIG. 6). These washers 58,
slabs 57, the lower legs 41 of the base frame members 37F, 37B and
the lower plate portions 51 of the side gussets 47 have vertically
aligned openings 59 therein for receiving fasteners 61 (e.g.,
bolts) for securing the rack 1 to a floor. The openings 59 in the
washers are circular whereas the openings in the slabs 57, the
lower legs 41 of the base frame members 37F, 37B and the lower
plate portions 51 of the side gussets 47 are oblong. As a result,
the bolts 61 and washers 58 are positionable at any location along
the length of the oblong openings 59. Desirably, the distance
between the center of one set of vertically aligned openings 59 and
a respective adjacent tubular frame member 15F, 15B is relatively
small (e.g., about 2 in.). By reducing the distance from the
tubular frame members 15F, 15B to the bolts 61, less material
thickness is required in the areas of the base between the bolts
and respective frame members to withstand the forces exerted during
a seismic event.
[0031] With reference to FIGS. 1 and 7, the mounting rails 5 for
mounting the equipment 9 on the rack 1 are preferably movable
independent of the frame 3 so that during a seismic event the rails
are adapted to move (flex) at a harmonic frequency different from
the harmonic frequency of the structural frame. This difference
serves as a vibration damping system tending to reduce the overall
amplitude and/or frequency of vibration of the rack during seismic
activity, which decreases the risk of damage to and/or failure of
the rack 1. Preferably, the configuration of the rack 1 should be
such that the structural framework carrying a maximum equipment
load has a natural harmonic frequency greater than the
high-amplitude frequencies of a typical seismic event (e.g., about
15 Hz compared to less than 10 Hz). Also preferably, the equipment
mounting rails 5 should have natural harmonic frequency different
from (greater or less than) that of the structural framework of the
rack 1 and greater than the high-amplitude frequencies of a seismic
event. By way of example, the mounting rails 5 may have a natural
harmonic frequency of about 12 Hz.
[0032] In one embodiment, the equipment mounting rails 5 comprise
angle bars, each having a first vertical leg 63 extending in a
side-to-side plane of the rack 1 and a second vertical leg 65
extending in a front-to-back plane of the rack (see FIG. 8). The
first (side-to-side) legs 63 of the rails 5 have fastener openings
67 spaced at regular intervals along their lengths for attachment
of electronic equipment 9 to the rails. By way of example, the
openings 67 may be circular holes spaced at regular intervals
(e.g., a series of holes which repeat at 5/8 in. -5/8 in. -1/2 in.
intervals), or at intervals corresponding to a standard
rack-mounting unit (RMU). The second (front-to-back) legs 65 of the
rails 5 have fastener openings 69 spaced along their lengths which
are adapted to align with selected openings 31 in the cross braces
25 for securement of the rails to the cross braces at desired
positions by suitable fasteners 71 (FIG. 2). The positions of the
equipment mounting rails 5 can be adjusted as needed simply by
removing the fasteners 71, relocating the rails, and then
refastening the rails to the cross braces 25.
[0033] Referring to FIGS. 1 and 14, tabs 72 are affixed to the
front and back tubular frame members 15F, 15B at opposite sides of
the rack 1. These tabs 72 are formed with apertures 74 which are
vertically aligned with other apertures 74A in respective side
gussets 47 of the rack for receiving fasteners to secure one or
more wire management devices to the rack. The rack 1 may have any
number of tabs 72 or other mounting elements. Alternatively, the
tabs 72 may be eliminated altogether.
[0034] Optionally (FIG. 8), the base 11 further comprises a
plurality of interior gussets 73 above the lower legs 41 of the
base frame members 37F, 37B, each interior gusset 73 having a
triangular upright portion 75 attached (e.g., welded) to a vertical
leg 39 of a respective front or back base frame member 37F, 37B and
a quadrilateral lower portion 77 overlying the lower leg of a
respective base frame member. The lower portions 77 of the interior
gussets 73 are sandwiched between the lower legs 41 of respective
base frame members 37F, 37B and respective reinforcing slabs 57,
and they are also positioned directly over the lower portions 51 of
the side gussets 47, creating a type of "stirrup" arrangement for
added strength. The lower portions 77 of the interior gussets 73
have oblong openings (not shown) therein vertically aligned with
respective openings 59 in the slabs 57, in the washer 58, in the
lower legs 41 of respective base frame member 37F, 37B, and in
respective lower plate portions 51 of the side gussets 47 for
receiving the aforesaid fasteners 61. The interior gussets 73
strengthen the rack 1 and are useful in situations where the rack
is intended to carry more weight than the previous embodiment,
e.g., 1000 lbs of equipment compared to 750 lbs.
[0035] The various components of the rack 1 may be secured together
in suitable fashion. For example, certain components can be welded
together as shown in FIGS. 9-16, the weld lines being indicated by
xxxxx on FIGS. 10-12 and 14-16. The structural components of the
rack frame 3 (e.g., frame members and base components) are
preferably fabricated from relatively light gauge structural steel,
e.g., metal tubing having a wall thickness of 0.075 in., and metal
plate having a thickness of 0.135 in. for the base frame members
37F, 37B, gussets 47, 73 and top frame members 17F, 17B, and a
thickness of 0.075 in. for the cross braces 25. As a result, the
rack 1 is relatively lightweight (e.g., 100 lbs or less) even
though very strong. The non-structural components of the rack 1
(e.g., the mounting rails 5) may be fabricated from angle bar stock
having a thickness of 0.135 in. These thicknesses are illustrative
only.
[0036] The rack 1 described above is strong and capable of
withstanding seismic activity. Further, the rack 1 is compact and
is open at its front, back, top, bottom and sides to permit routing
of cable to and from the equipment 9 on the rack in virtually any
direction. The rack 1 is also designed for convenient, compact
installation of cable tray 35 adjacent the top of the rack.
[0037] Certain of the features described above (e.g., the channel
space 33 in the top of the rack 1 for receiving cable tray 35) can
be incorporated in non-seismic racks without departing from the
scope of this invention.
[0038] When introducing elements of the present invention or the
preferred embodiment(s) thereof, the articles "a", "an", "the" and
"said" are intended to mean that there are one or more of the
elements. The terms "comprising", "including" and "having" are
intended to be inclusive and mean that there may be additional
elements other than the listed elements.
[0039] In view of the above, it will be seen that the several
objects of the invention are achieved and other advantageous
results attained.
[0040] As various changes could be made in the above constructions
without departing from the scope of the invention, it is intended
that all matter contained in the above description and shown in the
accompanying drawings shall be interpreted as illustrative and not
in a limiting sense.
* * * * *