U.S. patent number 3,558,091 [Application Number 04/776,677] was granted by the patent office on 1971-01-26 for channel-beam clamp.
This patent grant is currently assigned to Bundy Corporation. Invention is credited to William R. Bush.
United States Patent |
3,558,091 |
Bush |
January 26, 1971 |
CHANNEL-BEAM CLAMP
Abstract
In a suspended ceiling grid system, a channel-beam clamp
comprising a C-shaped body member having a channel-receiving notch,
a top tab extending downwardly and adapted to hook over a channel,
a locking tab adapted to be bent to a vertical position to lock the
clamp around the channel, attachment prongs having jaws adapted to
clamp a bulb of a ceiling grid member, an inverted U-shaped locking
skirt adapted to be slid downwardly over the attachment prongs so
that said legs lock the jaws in position on the bulb, and a lance
formed in one of the prongs for preventing upward movement of the
locking skirt.
Inventors: |
Bush; William R. (Downingtown,
PA) |
Assignee: |
Bundy Corporation (Detroit,
MI)
|
Family
ID: |
25108091 |
Appl.
No.: |
04/776,677 |
Filed: |
November 18, 1968 |
Current U.S.
Class: |
248/317;
52/506.07 |
Current CPC
Class: |
E04B
9/16 (20130101) |
Current International
Class: |
E04B
9/06 (20060101); E04B 9/16 (20060101); E04b
005/52 () |
Field of
Search: |
;248/58,59,61,62,63,317,323,327 ;52/484,489 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
1,216,512 |
|
May 1966 |
|
DT |
|
954,732 |
|
Apr 1964 |
|
GB |
|
161,523 |
|
Dec 1957 |
|
SW |
|
180,436 |
|
Aug 1962 |
|
SW |
|
Primary Examiner: Fraizer; Roy D.
Assistant Examiner: Foss; J. Franklin
Claims
I claim:
1. In a suspended ceiling grid system, a channel-beam clamp
comprising first means for attaching to a channel, second means for
attaching to a ceiling grid member, said second means including
attachment prongs of sheet material formed by slits and having jaws
adapted to clamp between them a bulb of a ceiling grid member, a
first locking means mounted on the prongs for locking the clamping
jaws in place, and second locking means on the prongs for locking
the first locking means in place, said first locking means
comprising an inverted U-shaped locking skirt having a pair of legs
depending from a slotted horizontal base which receives the prongs,
said locking skirt being adapted to be slid downwardly over the
attachment prongs so that said legs lock the jaws in position on
the bulb, said first attaching means comprising a C-shaped body
member having an upright portion with top and bottom horizontal
portions extending therefrom to define a channel-receiving notch, a
top tab extending downwardly from the end of the top horizontal
portion and adapted to hook over a channel, and a locking tab
extending from the bottom portion and adapted to be bent to a
vertical position to lock the clamp around the channel.
2. The clamp of claim 1 wherein said second locking means comprises
a lance formed in one of the prongs for preventing upward movement
of said first locking means.
Description
BACKGROUND OF THE INVENTION
This invention relates to suspended ceiling systems, and more
particularly relates to a channel-beam clamp for suspending the
interlocking members of a suspended ceiling grid system from a
series of channels.
Suspended ceiling grid systems must be supported or suspended from
the other elements in a building structure. Conventionally, the
grid system members are suspended by wires. However, the building
codes of some jurisdictions prohibit the use of wires and require
the use of black channels which are positioned about 4 feet
apart.
The ceiling grid members must be supported from these channels by a
means which is safe, strong, easily and quickly attached to the
channel and to the ceiling grid member, and which locks securely in
place.
SUMMARY OF THE INVENTION
It is an object of this invention to provide such means for
suspending ceiling grid members from channels. It is another object
to provide such means which is simple and relatively
inexpensive.
The objects of this invention are accomplished by providing a
channel-beam clamp which hooks over the channel and is locked
thereto by a locking tab, and which clamps onto the bulb of the
ceiling grid member and is locked thereto by a locking skirt that
is prevented from upward movement by a locking lance.
BRIEF DESCRIPTION OF THE DRAWINGS
Other objects and advantages of the invention will further become
apparent hereinafter and in the drawings, in which:
FIG. 1 is a fragmentary perspective view of the top of a ceiling
grid structure showing channels and channel-beam clamps attaching
the channels to ceiling grid members;
FIG. 2 is a view in side elevation of a channel-beam clamp
constructed in accordance with this invention;
FIG. 3 is an end view of the channel-beam clamp shown in FIG. 2;
and
FIG. 4 is a top plan view of the locking skirt which forms an
element of the channel-beam clamp.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Although specific terms are used in the following description for
clarity, these terms are used to refer only to the structure shown
in the drawings and are not intended to define or limit the scope
of the invention.
Turning now to the specific embodiment of the invention selected
for illustration in the drawings, there is shown in FIG. 1 a
partial view in perspective of a suspended ceiling grid system 11
including a plurality of interlocking main beams or members 13 and
cross tees or members 15. Each of the main and cross members 13, 15
have a vertical fin 17, outwardly projecting horizontal flanges 19
at the bottom of the fin, and a bulb 21 at the top of fin 17. Bulb
21 is shown in FIGS. 2 and 3 as being round, but it may be square,
rectangular, or any other suitable configuration.
The horizontal flanges 19 of grid members 13, 15 support ceiling
tiles 23, and the grid members are supported from a series of
channels 25 by a plurality of channel beam clamps 27.
Channel-beam clamps 27 comprise a C-shaped body member having an
upright portion 29 with a top portion 31 and a bottom portion 33
extending therefrom to define a channel-receiving notch 35. A top
tab 37 extends downwardly from the end of top portion 31 and is
adapted to hook over channel 25. A locking tab 39 extends
horizontally from bottom portion 33 and is adapted to be bent to a
vertical position to lock the clamp 27 around channel 11.
Three attachment prongs 41--43 extend downwardly from bottom
portion 33 and are provided with curved jaws 45 that are adapted to
clamp around the bulb 21 of a ceiling grid member with prong 42 on
one side of the bulb and prongs 41 and 43 on the other.
An inverted U-shaped locking skirt 47 having a pair of legs 49
depending from a horizontal base 51 is provided with a slot 53 that
receives prongs 41--43. Skirt 47 is adapted to be slid downwardly
over the attachment prongs 41--43 so that legs 49 contact and lock
the jaws 45 in position on the bulb 21.
To insure that locking skirt 47 remains in place and does not ride
or move upwardly, a locking lance 55 is formed or punched in prong
42, and the bottom of lance 55 is adapted to contact the top of
locking skirt base 51 to prevent upward movement of locking skirt
47. Slot 53 includes an enlarged central portion 57 which is
adapted to slide downwardly more easily over lance 55.
In operation, the channel-beam clamps 27 are attached to channels
25 by hooking top tab 37 over the channels and bending locking tab
39 upwardly to lock the clamp 27 in place on the channel. The
clamps 27 are attached to ceiling grid members 13, 15 by placing
the prong jaws 45 around bulb 21, and sliding locking skirt 47
downwardly so that legs 49 clamp the jaws in place around the bulb.
During the downward movement of skirt 47, locking lance 55 moves
inwardly to allow the skirt to pass, and then springs outwardly to
prevent the skirt 47 from moving upwardly.
It is to be understood that the form of the invention herewith
shown and described is to be taken as a presently preferred
embodiment. Various changes may be made in the shape, size and
arrangement of parts. For example, equivalent elements may be
substituted for those illustrated and described herein, parts may
be reversed, and certain features of the invention may be utilized
independently of the use of other features, all without departing
from the spirit or scope of the invention as defined in the
subjoined claims.
* * * * *