U.S. patent number 3,924,370 [Application Number 05/491,343] was granted by the patent office on 1975-12-09 for raised floor with clamped panel support.
This patent grant is currently assigned to Bell Telephone Laboratories, Incorporated. Invention is credited to Walter Bartholomew Cauceglia, Charles Gerlt, Luis Arturo Peralta.
United States Patent |
3,924,370 |
Cauceglia , et al. |
December 9, 1975 |
Raised floor with clamped panel support
Abstract
A raised floor structure supports electronic equipment units and
provides space for electric cabling thereunder. A plurality of
spaced parallel beams are supported above a subfloor by vertically
adjustable pedestals. A first group of freely insertable and
removable rectangular floor panels, each resting on a pair of
adjacent beams, forms equipment unit access areas. A second group
of rectangular floor panels, each having its underside rigidly
attached to a pair of adjacent parallel beams, forms a base for
equipment units. The rigidly attached floor panels provide
horizontal structural support for the spaced parallel beams.
Inventors: |
Cauceglia; Walter Bartholomew
(Wayne, NJ), Gerlt; Charles (Livingston, NJ), Peralta;
Luis Arturo (Mendham, NJ) |
Assignee: |
Bell Telephone Laboratories,
Incorporated (Murray Hill, NJ)
|
Family
ID: |
23951792 |
Appl.
No.: |
05/491,343 |
Filed: |
July 24, 1974 |
Current U.S.
Class: |
52/126.6;
52/220.3; 52/263 |
Current CPC
Class: |
E04F
15/0247 (20130101) |
Current International
Class: |
E04F
15/024 (20060101); E04F 013/08 () |
Field of
Search: |
;52/126,220,263,483,478,550,122,588,629,592,593,541,585,586,390,391 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Bell; J. Karl
Attorney, Agent or Firm: Cubert; J. S.
Claims
What is claimed is:
1. A raised floor for supporting equipment above a subfloor and
providing space underneath said equipment for cabling and ancillary
apparatus comprising a plurality of beams in spaced parallel
relation to each other running along one direction, a plurality of
vertically adjustable pedestals for supporting each beam, a
plurality of freely insertable and removable first rectangular
floor panels each having planar edges and each spanning between a
pair of adjacent beams and having opposite ends resting on portions
of said adjacent beams, a plurality of second individually
insertable and removable rectangular floor panels having planar
edges underlying said equipment, each second panel spanning between
a pair of adjacent beams and having opposite ends resting on
portions of said adjacent beams, and means for fixedly supporting
said beams in said spaced parallel relation comprising means for
rigidly attaching each pair of adjacent second panels to the common
beam on which said pair of adjacent second panels rest.
2. A raised floor according to claim 1 wherein said attaching means
comprises means for rigidly clamping the underside of each second
panel to each of the adjacent beams on which its rests.
3. A raised floor according to claim 2 wherein each beam comprises
a rectangular cross-section channel having an upper web on which a
pair of juxtaposed second panels rest and a pair of downwardly
extending vertical flanges, and said clamping means comprises a
clamp conformed around said flanges and including a horizontal
extension underneath each of said juxtaposed second panels, each
clamp horizontal extension being rigidly but removably connected to
the underside of the overlying juxtaposed second panel.
4. A raised floor for supporting a plurality of equipment units
above a subfloor comprising a plurality of uniform cross-section
channels running in one direction in spaced parallel relation, a
plurality of vertically adjustable pedestals resting on said
subfloor for supporting each channel, a plurality of first
rectangularly dimensioned individually insertable and removable
floor panels having planar edges each spanning a pair of adjacent
channels and having opposite ends resting on portions of said
adjacent channels in equipment access sections, a plurality of
second rectangularly dimensioned individually insertable and
removable floor panels each having planar edges and each spanning a
pair of adjacent channels and having opposite ends resting on a
portion of each adjacent channel in sections underlying said
equipment units, means for rigidly holding said channels in spaced
parallel relation comprising means for rigidly but removably
attaching the undersides of each pair of juxtaposed second panels
to the channel on which said juxtaposed panels commonly rest.
5. A raised floor according to claim 4 further comprising means for
rigidly attaching each equipment unit to the second panel
underlying each equipment unit.
6. A raised floor according to claim 4 wherein said channel has a
rectangular cross section comprising an upper web on which said
floor panels rest and a pair of downwardly extending vertical
flanges, and said attaching means comprises a hat-shaped clamp
including a U-shaped section saddled around said channel flanges
and a pair of horizontal extensions each underneath one of said
juxtaposed second floor panels resting on said saddled channel, and
means for rigidly but removably connecting the underside of each
juxtaposed second panel to the underlying clamp horizontal
extension.
7. A raised floor according to claim 6 wherein each horizontal
extension includes an apertured section, each juxtaposed second
panel includes a threaded insert overlying said apertured section
of said clamp horizontal extension, and a cap screw threadily
engaged with said panel threaded insert to rigidly connect said
clamp to said overlying juxtaposed panel.
8. A raised floor for supporting a plurality of equipment units
above a subfloor to provide space for cabling and ancillary
apparatus beneath the equipment units comprising a plurality of
spaced parallel beams, each beam running the length of said raised
floor, a plurality of vertically adjustable pedestals attached to
each beam and resting on said subfloor for supporting said beam, a
group of first rectangularly dimensioned floor panels each having
planar edges and sized to span between a pair of adjacent beams and
having an opposite end resting on a portion of each adjacent beam,
said first panels being individually insertable and removable and
arranged side by side to form sections for accessing said equipment
units, a group of second rectangularly dimensioned individually
insertable and removable floor panels each having planar edges and
each sized to span a pair of adjacent beams and having an opposite
end resting on a portion of each adjacent beam, said second panels
being placed side by side to form rows transverse to the direction
of said beams, said equipment units being supported on said rows of
second panels, and means for rigidly supporting said beams in said
spaced parallel relation comprising means for clamping the
undersides of each pair of adjacent second panels to the beam on
which said adjacent panels commonly rest.
9. A raised floor according to claim 8 wherein each beam comprises
an upper web section on which juxtaposed panels rest and a pair of
vertical flanges extending downwardly from the edges of said web
section, and said clamping means comprises a hat-shaped clamp
including a U-shaped section saddling said flanges and a horizontal
section extending underneath each juxtaposed second panel resting
on said saddled beam, each juxtaposed second panel resting on said
saddled beam including an internally threaded insert, each clamp
horizontal section having an aperture aligned with said threaded
insert and a cap screw for threadedly engaging said threaded insert
to rigidly but removably affix said clamp to said juxtaposed second
panel.
10. A raised floor according to claim 9 wherein said first panels
and said second panels are arranged in alternating rows running
transverse to the direction of said beams, each first panel being
freely removable for accessing the underside of said adjacent
second panels.
11. A raised floor for supporting rearrangeable equipment above a
subfloor comprising a plurality of stringers each running the
length of the raised floor in substantially uniform spaced parallel
relation, a line of spaced vertically adjustable pedestals resting
on said subfloor for supporting each stringer, a plurality of
rectangularly dimensioned planar edged floor panels, each panel
spanning adjacent stringers and having opposite ends resting on
portions of said adjacent stringers, and means for rigidly fixing
said stringers in said spaced parallel relation comprising means
for rigidly but removably clamping the undersides of selected floor
panels to the stringer on which said selected panels rest.
Description
BACKGROUND OF THE INVENTION
Our invention relates to raised floor construction adapted to
support equipment units requiring space thereunder for cabling and
ancillary apparatus, and more particularly to raised floor
structures having a plurality of panels supported on a pedestal
arrangement over a subfloor.
In communication and computing facilities and elsewhere, the
interconnection of electronic equipment units involves complex
electrical cabling, piping and duct work between the equipment
units. An elevated floor overlying the existing floor structure can
be employed to provide space for cabling and other apparatus
underneath the electronic equipment units in a manner that avoids
interference with equipment units, interference with equipment
operation and maintenance, accidental damage, and hazards to
operating personnel. Such floor structures include removable
sections for inspection and maintenance of the cabling and
apparatus between the subfloor and the raised floor on which the
equipment units are mounted.
In one type of priorly known raised floor construction, a plurality
of rectangularly dimensioned, rigid, lightweight panels are placed
over a rectangular grid of supporting beams. The beams, in turn,
are attached to the subfloor by means of periodically spaced
pedestals. Each panel is freely insertable and removable so that
access to areas underneath the raised floor is available. The
interconnection of the orthogonal beams, however, is complex and
expensive owing to the requirement that the raised floor panels
form a smooth, flat surface.
Another type of known floor panel construction utilizes a
supporting structure of parallel beams running the length of the
floor in one direction. Each beam is mounted on a plurality of
pedestals, which pedestals rest on the subfloor. Each rectangularly
dimensioned floor panel is spanned between a pair of adjacent beams
and a continuous raised floor is formed by side-by-side panel
placement. To prevent shifting of the parallel beams, the ends of
the floor panels overlying the beams are rigidly attached to the
beams by a bar structure running the beam length. In this manner,
the raised floor is fully supported and the floor panels form an
integral part of the support structure. The connection between the
floor panels and the beams, however, increases the difficulty of
removal of an individual panel for purposes of inspection or
maintenance. Additionally, the structure of the floor panel ends,
the beams, and the overlying bar are relatively complex in order
that the junction of the floor panel ends and the overlying bar
conform to the smooth surface of the raised floor. Further, the
metallic bar structure provides an unwanted electrical path to
ground through the raised floor structure.
It is an object of the invention to provide an improved raised
floor supported on a parallel spaced beam structure and having
freely insertable and removable individual floor panels for access
to the space beneath the raised floor.
It is another object of the invention to provide an improved raised
floor structure having a plurality of spaced parallel beams which
are prevented from shifting by attachment of selected floor panels
to the beams adjacent thereto.
It is yet another object of the invention to provide an improved
raised floor structure having selected floor panels laterally
supporting the spaced parallel beams and other panels freely
insertable and removable to provide ready access to the space
beneath the raised floor.
It is yet another object of the invention to provide an improved
raised floor structure for supporting a plurality of equipment
units wherein each laterally supporting floor panel underneath
equipment has its underside rigidly clamped to the pair of adjacent
beams on which it rests.
It is yet another object of the invention to provide an improved
raised floor structure for supporting a plurality of equipment
units wherein the laterally supporting floor panels are arranged in
rows underlying the equipment units. Freely insertable and
removable floor panels are arranged in rows adjacent to the
laterally supporting floor panels whereby access to the space
beneath the raised floor and the laterally supporting panel
clamping arrangements is obtained.
It is yet another object of the invention to provide an improved
raised floor structure adapted to protect electronic equipment
mounted thereon from overturning.
SUMMARY OF THE INVENTION
The invention is directed to a raised floor structure for
supporting equipment above an existing floor while allowing space
beneath the equipment for cabling, pipes and other ancillary
apparatus. A plurality of spaced, parallel beams are supported on
subfloor mounted, vertically adjustable pedestals. Each of a first
group of rectangularly dimensioned floor panels spans between
adjacent parallel beams and rests thereon in nonequipment areas.
Each of a second group of rectangularly dimensioned floor panels
spans between adjacent parallel beams and rests thereon underneath
equipment units. Each first group panel is freely insertable and
removable from adjacent beams, but each second group panel has its
underside portion thereof rigidly attached to the beams on which it
rests whereby the second group panels provide transverse support
for the parallel beam structure.
According to one aspect of the invention, the underside of each
adjacent pair of said second group panels is attached to the common
base underlying said panels by a removable clamp connected to the
undersides of said pair of second group panels and to the common
beam. Access to said clamp is obtained by removal of an adjacent
first group panel.
According to another aspect of the invention, the second group
panels are placed in rows running transverse to the direction of
the parallel beams, said rows of second group panels underlying
equipment units.
According to yet another aspect of the invention, selected first
group panels and each second group panel includes an apertured
venting section which permits air flow adjacent to said equipment
units.
According to yet another aspect of the invention, each equipment
unit is rigidly attached to the second group panel underlying said
unit to prevent overturning of said unit.
In an embodiment illustrative of the invention, a plurality of
rectangular cross-section beams are placed in a parallel spaced
relationship to form supports for rectangularly dimensioned, rigid
but lightweight raised floor panels. Each beam is mounted on a
plurality of vertically adjustable pedestals, which pedestals rest
on the subfloor. The raised floor is divided into sections that
underlie and support electrical equipment units and into sections
used by operating personnel for access to said equipment units. In
the access sections, a plurality of first dimensioned rectangular
floor panels are placed side by side to form a flat surface. Each
first dimensioned floor panel spans between and rests on adjacent
parallel beams and is juxtaposed with adjacent floor panels.
In the equipment unit floor sections, generally arranged in rows
running transverse to the direction of the parallel beams, a group
of second dimensioned floor panels are placed side by side to form
a base underneath said equipment units. Each second dimensioned
panel spans between adjacent beams and rests thereon so that a pair
of juxtaposed second dimensioned panels rest on a common beam. The
underside of each second dimensioned panel includes a threaded
insert. A hat-shaped clamp is saddled around lower edge and sides
of the rectangular common beam and is alinged with the threaded
inserts of the juxtaposed second dimensioned panels. A cap screw
fixedly connects the clamp to the juxtaposed second dimensioned
panel. In this manner, the row of clamped second dimensioned panels
forms a rigid transverse support to prevent shifting of the
parallel spaced beams. Advantageously, only the second dimensioned
beams which are trapped underneath equipment units are clamped in
place. The first dimensioned panels in nonequipment sections are
freely removable and insertable for access to cabling and ducts
underneath the raised floor and for access to the clamps holding
the trapped panels. The clamped panels may be moved and rearranged
to adapt to modifications in equipment unit placement.
DESCRIPTION OF THE DRAWING
FIG. 1 depicts a perspective view of a raised floor illustrative of
the invention, with parts broken away to illustrate
construction;
FIG. 2 is a top view of a section of floor panels including a pair
of floor panels which form the base for equipment units;
FIG. 3 is a front view of the adjacent panels of FIG. 2 taken along
lines 3--3 of FIG. 2;
FIG. 4 is an enlarged view of the clamping arrangements for floor
panels which form the base for equipment units taken along lines
4--4 of FIG. 2;
FIG. 5 is an enlarged view of the pedestal arrangements in FIG. 2
taken along lines 5--5 of FIG. 2; and
FIG. 6 is a side view taken along lines 6--6 of FIG. 2.
DETAILED DESCRIPTION
With reference to FIG. 1, equipment frames 6 are supported at a
predetermined distance above subfloor 9 on the rectangular array of
raised floor panels 3 and 4. The space underneath the array of
raised floor panels and above subfloor 9 permits an electrical
cable network to interconnect equipment units 6 and also permits
ancillary apparatus servicing the equipment units to be placed
between the raised floor and subfloor 9. Such ancillary units may
include pipes and air-conditioning elements such as air plenum
space for equipment cooling.
The raised floor structure includes a plurality of spaced parallel
beams 1 running in one direction as shown in FIG. 1. Each beam
comprises a rectangular cross-section channel and is supported on a
plurality of equally spaced, vertically adjustable pedestals 2
which rest on the subfloor. The raised floor itself comprises first
dimensioned rectangular panels 4 arranged to form a flat surface in
equipment access areas and second dimensioned rectangular panels 3
underlying equipment units 6. Each first dimensioned panel 4 has
opposite ends 10 resting on a pair of adjacent beams and the panel
is freely insertable and removable from the floor. Each second
dimensioned panel 3 has opposite ends 11 resting on a pair of
adjacent beams and is rigidly attached to said adjacent beams to
provide transverse support for the adjacent beams whereby shifting
of the parallel beams is prevented. The dimensions of panels 3 are
adapted to fit underneath equipment 6. It is to be understood,
however, that panels 3 may be of different dimensions and may be
the same sizes as panel 4.
FIG. 2 shows a top view of first dimensioned panels 3a and 3b in a
particular equipment section of the raised floor along with
adjacent freely insertable and removable panels 4a and 4b. Panel 3a
spans between and rests on beams 1a and 1b and panel 3b spans
between and rests on beams 1b and 1c. Panel 3a is rigidly attached
to beams 1a and 1b by underside mounted clamp 71a and 71. Similarly
panel 3b is rigidly attached to adjacent beams 1b and 1c by clamps
71 and 71b. Pedestals 2a, 2b, and 2c underlie beams 1a, 1b, and 1c,
respectively.
FIG. 3 shows a front view of the raised floor structure of FIG. 2
wherein the hat-shaped clamps 71a, 71, and 71b are shown attached
to floor panels 3a and 3b. Also shown in FIG. 3 are pedestals 2a,
2b, and 2c, which pedestals support beams 1a, 1b, and 1c,
respectively. The individual pedestal structure and its connection
arrangements to the underlying beam are shown in FIG. 5.
Referring to FIG. 5, pedestal 2 comprises base plate 21 which rests
on subfloor 9. Lower column 23 extends upwardly from the center of
base plate 21 and the upper portion of column 23 includes
externally threaded section 25. Upper column 27 has a plate 29
fixedly attached to its upper end and said upper column includes a
hollow lower end 31. Hollow end 31 is slid over threaded section 25
of lower column 23 and rests on jack nut 33 which is threadily
engaged with lower column section 25. Adjustment of the height of
jack nut 33 provides a vertical leveling adjustment for the
overlying raised floor. The leveling adjustment accommodates
variations in the surface of subfloor 9. Cylindrical ferrule 37 is
press fitted on the outside of upper column 27 at its lower end 31
and rests on jack nut 33. Serrated grooves 35 in jack nut 33
receive corresponding projections of ferrule 37 and the weight of
the raised floor structure bearing on upper column 27 urges member
37 into grooves 35 whereby the jack nut is constrained from
rotation after the leveling adjustment has been completed.
Plate 29 on the top of upper column 27 includes a pair of holes
symmetrically positioned on either side of column 27. Rectangular
nuts 41 inserted into the slotted low side of beam 1b and held in
place by the upwardly in-turned edges 43 of beam 1b are positioned
over the holes in plate 29. The lower face of each rectangular nut
includes serrated grooves into which in-turned edges 43 fit whereby
nut 41 is prevented from rotating. Spring 45, resting against upper
web 49 of beam 1b, forcibly urges nut 41 downwardly against the
in-turned edges 43. Cap screws 47 are pushed through the holes in
plate 29 and are threaded through nuts 41 to rigidly connect the
pedestal to beam 1b. A side view of the pedestal illustrating the
positions of cap screws 47 and plate 29 is shown in FIG. 6.
Each beam 1 has a rectangular cross-section as shown in FIG. 5 and
includes closed top or web 49 and flanges 51 and 52. The flanges
extend vertically downward and have upwardly in-turned edges 43
whereby the lower face of the beam includes a slot formed by
in-turned edges 43. Each beam may comprise sections of standard
length whereby two or more end to end sections may be required in
the raised floor structure of FIG. 1. Two beam sections may be
joined over a pedestal by means of a U-shaped member 28 as
illustrated in FIG. 1. The U-shaped member includes a pair of holes
on either side of upper column 27 which screw into rectangular
nuts. The rectangular nut is inserted into each beam section. The
vertical sides of U-shaped member 28 are fitted tightly over
flanges 51 and 52 to rigidly connect the two beam sections. The
U-shaped junction member replaces plate 29 in the pedestal shown in
FIG. 5.
FIG. 5 also shows the mounting arrangements for a pair of second
dimensioned floor panels 4a and 4b on common beam 1b. A vinyl strip
64 having a wedge projection 66 overlying the beam web center is
attached to web 49 and serves as a keying device for the proper
positioning of panels 4a and 4b. Edge 61 of panel 4a and edge 62 of
juxtaposed panel 4b each extend downwardly and inwardly so that the
panels meet at their upper edge points and are displaced by wedge
66 at their lower edge points. Panel 4a rests over one half of web
section 49, while panel 4b rests over the other half of web 49
whereby the loads on panels 4a and 4b are transmitted to beam 1b
and therefrom to the subfloor via the pedestals supporting beam 1b.
Panels 4a and 4b, as well as all other second dimensioned panels,
are freely insertable and removable from the raised floor through
the use of suction devices or other means well known in the art
adapted to verticalaly lift and lower the floor panels.
FIG. 4 illustrates the mounting and clamping arrangements for a
pair of first dimensioned panels 3a and 3b juxtaposed over common
beam 1b. Panel 3b includes an internally threaded insert 73 which
is epoxied into a hole of suitable dimensions drilled into panel 3b
a preset distance from flange 52. Similarly, an insert is placed in
panel 3a. Where the top plate of panel 3b is metallic, an
insulating washer 75 is placed between the metallic plate and
insert 73 to electrically insulate the plate from the raised floor
structure. In this way the raised floor surface is electrically
insulated from the beam and pedestal arrangement.
Hat-shaped clamp 71 of suitable width is saddled around beam 1b so
that it tightly conforms to flanges 51 and 52. The holes in the
horizontal extending members of clamp 71 are aligned with threaded
insert 73 under washer 81, which washer has the same thickness as
keying strip 64. A similar arrangement is provided for panel 3a.
Cap screw 77 is threaded into insert 73 through washer 79 whereby
clamp 71 is rigidly connected to panel 3b. Similarly, cap screw 85
is threaded into the insert of panel 3a to rigidly connect clamp 71
to panel 3a. Panels 3a and 3b are also clamped to beams 1a and 1c
by clamps 71a and 71b, respectively, as shown in FIG. 2. In this
way, the second dimensioned panels 3 form a transverse support to
prevent beams 1 from shifting. Generally, second dimensioned panels
3 are arranged in rows transverse to the direction of beams 1; and
the rigid connection of panels 3 to beams 1 provides a transverse
structural support for the raised floor. The freely insertable and
removable panels 4 adjacent to the rows of panels 3 provide access
to the hat-shaped clamps and the cap screws connecting panels 3 to
beams 1 and to the space beneath the raised floor.
In FIG. 1 each transverse row of clamped floor panels 3 form a base
for equipment unit 6. Panel 3 includes a venting section 7
comprising a rectangular array of apertures which serve as cooling
air passageways. Air flows downward past one side of equipment unit
6, through venting section 7 of panel 3, and into the space between
the raised floor and the subfloor. This space functions as a return
air duct for the cooling system arrangements not shown. Selected
rows of freely insertable and removable panels 4 also include
venting sections 8 located in the centers thereof. These venting
sections provide air return passageways between adjacent rows of
equipment unit 6 on the sides of the equipment units opposite to
venting sections 7. The remaining rows of panels 4 provide
personnel access ways to the equipment units. Panels 4 in these
access rows do not include venting sections, since venting section
7 of adjacent panels 3 suffices for cooling.
Equipment units 6 in FIG. 1 have a relatively narrow and high
silhouette whereby there is a possibility of accidental
overturning. To avoid such possible overturning, the equipment
units are fixedly attached to the underlying panels 3. Internally
threaded inserts 90 are included in the upper sides of affixed
panels 3 and the overlying equipment unit is bolted into place by
bolts 91 which are threaded into inserts 90. Since panels 3 are
rigidly attached to the space parallel beam structure, the bolting
of equipment units to panels 3 provides adequate structural support
for the equipment units.
The described raised floor advantageously provides a smooth, flat,
continuous surface in both equipment and equipment access areas.
The panels trapped underneath equipment units are rigidly affixed
to the underlying spaced parallel beam structure whereby the beams
are laterally supported to prevent shifting. The affixing of the
beams to the underside of the trapped panels eliminates any
possibility of electrical grounds on the floor surface. All other
floor panels are freely insertable and removable so that access to
the space underneath the raised floor is readily obtained.
* * * * *