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Патент USA US3058723

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Oct. 16, 1952
Filed April 12. 1960
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Fatented Oct. 16, 1962
Richard W. Nemire, 1152 E. 3rd St, Ottawa, Ohio, and
Charles R. Recob, S12, 1012 W. Market St., Lima, Ohio
Filed Apr. 12, 1960, Ser. No. 21,648
2 Claims. (Cl. 248—228)
along the length of the arm and beyond the bight of the
0 whereby the loading imposed by the suspended ele
ment is aligned with the portion of the bar joist over
which the clamp is ?tted, thereby minimizing the turning
moment imposed upon the clamp about the joist.
The objects and features of this invention will be more
fully appreciated from the following detailed description
This invention relates to C clamps particularly 0 clamps
of the type employed in suspending conduit or pipe from
when read with reference to the accompanying drawing
joists as in sprinkler pipe installations. These C clamps
have normally comprised a bight with substantially sym
FIG. I is a plan view of the clamp of this invention as
overhead structures.
applied to a built-up roof mounted on a bar joist, the
Heretofore, forged malleable castings of 0 form have
roof and joist being shown in section for purposes of
been employed to suspend conduit pipe from overhead
metrical arms when viewed in side elevation.
FIG. Ii is an end view of the clamp of FIG. I with
Current 15 portions of the clamping stud ‘broken away to better reveal
construction practices and the materials now employed
frequently present situations where these prior clamps
the details of construction;
FIG. III is a plan View of the clamp of FIG I; and
FIG. IV is a perspective view of the clamp and broken
away portions of a bar joist and roof construction for
cannot be utilized, for example, bar joists are now used
in a form comprising spaced base members in place of
the usual ?anges and are provided with intermediate 20 which this clamp is particularly adapted.
As best seen in FIG. I the clamp of this invention is
webs made up of an open framework. The base mem~
of ‘0 form and comprises a bight 11, an upper arm 12 and
hers are frequently spaced such that sprinkler piping must
a lower arm 13. The arms 12 and 13 are of substantial
be suspended above the lower base and running through
length and extend beyond the bight to provide an open
the open webbing. Roofs are frequently constructed with
region 14 intermediate the inner faces of the arms into
shallow channels of metal laid directly on the joist so that
which is received the element to which the clamp is to
the major faces of the channels are separated from the
be secured. Upper arm 12 is of only limited thickness
joist ?anges by the depth of the channel sides engaging
while being of substantial width. That is, the upper arm
those ?anges. Another roof or ceiling construction com
has a major dimension transverse of its length and per
prises a sheet material laid directly on the joist combined
with a built up upper surface thereon. These types of 30 pendicular to the plane of the clamp, its width, and a
minor dimension transverse of its length and parallel to
construction require that piping and conduit be suspended
its plane, its thickness or depth, wherein the major di—
by means other than conventional C clamps. For ex
mension is several times that of the minor dimension.
ample, attempts have been made to make connection di
In one embodiment the upper arm is about eight times
rectly between suspension elements and the roof ceiling
or joist ?anges by means of penetrating fasteners applied 35 as wide as it is thick. The resulting relatively thin arm
of the C can readily be ?tted in between closely spaced
by impact. Various complex clamping ‘arrangements have
elements and as illustrated in FIG. I, even forced between
been employed to couple suspension elements to the up
superposed elements such as the bar joist ?ange 15 and
per ?anges of the joist. With the roo?ng laid directly
superposed roo?ng ‘board 16, with only a minimum of
on those ?anges or ‘spaced from those ?anges by only a
shallow side of a metal channel, insu?icient spacing is 40 distortion or disruption of the roo?ng board. This type of
roof construction is frequently composed of Celotex board
provided beneath the undersurface of the roo?ng and
16 with an overlayer 17 of poured gypsum and a built-up
the joist ?ange to mount the C clamps currently available.
roof 18.
Therefore, special arrangements must be made to support
The lower arm 13 of the clamp is formed with a boss
sprinkler systems in this type of construction.
In accordance with the above, one object of the present 45 19, best seen in FIG. IILupon which are supported the
clamping means, stud 21, and the suspending means for
invention is to provide an improved clamp which is uni
the conduit or pipe supported by the combination, such
versally adaptable to modern construction. Another ob
ject is to improve the mounting for suspended pipe and
as a machine rod ‘22. Advantageously, the clamping stud
and machine rod are secured in the boss by threading in
conduit. A third object is to meet the loading require
ments imposed in suspending pipe and conduit with a 50 tapped holes 23 and 24,, respectively which are parallel
to the length of the bight 11 and the plane of the C.
clamp which lends itself to engagement with close spaced
Locked nuts 25 and 26 are provided to prevent loosening
elements. A further object is to facilitate the suspension
the stud and rod.
of pipe and conduit from one of a group of superposed
The length of the arms 12 and 13 is such that the boss
elements with a minimum disturbance of those elements.
In accordance with the above objects, one embodiment 55 is positioned beyond the bight of the C clamp and is,
therefore, below the supporting ?ange 15 of bar joist 27.
of this invention comprises a clamp of general 0 form for
Bight 11 is formed with substantial width in order to
hanging pipe or conduit from bar joists. The clamp is
provided with an upper arm of substantial extent in a
generally horizontal plane and of a limited vertical depth.
sustain the loading imposed on the arms 12 and 13 tend
ing to spread them apart. Arm 112 is joined to the bight
A bight couples the upper arm to the lower arm and is 60 11 in a manner to present a continuous, smooth and sub
stantially ?at upper surface to avoid interfering with the
re-enforced at its junction with the upper arm over a
elements of the structure beyond the arm such as the
substantial area of its undersurface by fairing. The lower
material 16 by extending the wide portion of the
arm, also integral with the bight, is constructed with a
arm across a substantial portion of the width of the bight
substantial depth in a plane of the C and is arranged for
65 and by fairing the arm into the bight as at 28.
supporting a means clamping the C to a ?ange of a bar
The bar joist 27 shown in FIG. I comprises a pair of
joist or the like and for supporting a coupling, such as
opposed L-shaped members 31 having ?attened ?anges
a machine rod, upon which the pipe or conduit is suspend
1‘5 and coupled by a built-up web made up of circular
ed. Advantageously, this suspension from the lower arm
rods 32. In such a construction the open portion 14 of
is a?orded by a boss through which a pair of adjacent
tapped holes pass for the reception of a threaded clamp
ing stud ‘and a threaded rod, both of which are located
the clamp need be arranged to alter only su?‘icient clear
ance for the thickness of the ?ange 1'5. However, this
clamp is intended for universal utilization and, therefore,
must be ‘adaptable for receiving in its open portion 14
elements of substantial depth. One such element is
mum of interference, a boss mounted on said other arm
' shown in FIG. IV. In the construction of FIG. IV, the
joist is made up of top and bottom base members run
beyond the body of said bight, said boss having a pair
of cylindrical cavities aligned along the length of said
ning longitudinally thereof and having ?anges 33 bent
other arm and having their longitudinal axes parallel and
extending to intersect said .onefarm substantially normal
to the plane de?ned by its length and its major dimen
structural member and said second member with a mini
back to a plane generallyparalleling the plane of the
joist web made up of the rod elements 34. It will be
noted that the arms 12 and 13 of the clamp are of suf
. sion transverse of its length, and means for supporting a
?cient length to provide an open section 14 intermediate
clamping pin and a hanger rod‘in said cavities.
the'web 11 and the hanger rod 22 for the reception of the 10
2. A C clamp adapted for sustaining loads from a
?ange 33 such that the clamp lends itself to a mounting
structural member having a substantially ?at face, said
on the bar joist of the type shown in FIG. I or of the type
structural member having a second member positioned
closely adjacent said face, comprising a bight, a pair of
shownin FIG. IV. Further, if desired, the bight 11 can
be lengthened to provide a greater height in the open
‘arms of substantially equal length, one at each side of
section '14 without losing the advantages of the construc 15 said bight, one of said arms having the major dimension
tion depicted.
transverse of its length perpendicular to the plane of the
FIG. IV illustrates one utilization of the clamp where
C, and a minor dimension substantially less than said
in hanger rod '22 extending from boss 19 supports at its
.major dimension parallel to the plane of the C, said one
lower end‘ a ring 35 through which piping or conduit 36
arm extending in said major and minor transverse di
extends. The ring 35 can be conveniently coupled to the 20 mensions across of a portion of the end of said bight, the
rod 22 by a tapped hole in the integral boss 37 for re
other of said armshaving a major dimension transverse
ceiving, a threaded end ofrthe rod.
of its length parallel to the plane of the C, said one arm
"From the above it is apparent that the novel form of G , having a smooth, substantially ?at face most remote from
clamp of this invention lends itself to mounting on closely
said other arm, said 'face de?ning the outermost limit of
spaced or superposed "elements with a minimum’ of dis 25 said clamp in the dimension normal to the plane of said
ruption of the elements where they are in contact, and
0 and most remote from said other arm, whereby said
' where the elements are spaced slightly, the clamp clears
the second element without'any detrimental effects on
one arm can be moved between said face of said structural
member and- said second member with a minimumtof in
the clamping action obtained on the ?rst element from
terference, a boss on said other arm having a pair of
which the clamp is to be suspended. The construction 30 apertures with axes parallel to the plane of said O and
illustrated can be altered in its proportions without loss
the length of said bight, the extension of said axes inter
of the advantages o?ered by the shallow construction of
leg 12 and, similarly, the means of securing the clamp to
its supporting element and for suspending other elements
secting said one armsubstantially normal to the plane
' de?ned by its length and its major dimension’ transverse
of its length, each of said apertures being spaced out
wardly along said other arm from the juncture of said
arm and said bight, the extensions of the axes of said
apertures extending across the, open face of said bight
from the clamp can be modi?ed. Therefore, it is to be
recognized that modi?cations of the clamp can be made
without departing from the spirit and scope of this in
vention and, that this disclosure is to be read as illustra- ,
tive of the invention vandnot in a limiting sense.
What is claimed is:
1. A Q clamp adapted for sustaining loads from a
structural member having a substantially flat face, said
structural member having a second member positioned
~. and intersecting said one arm. at points spaced along the
arm from the juncture ofsaid arm withsaid' bight, a
40 clamping pin ?tted into the outermost one of said aper
closelyadjacent said'face, comprising a'bight, a pair of
arms of substantially equal lengths, one. at each side of 45
said bight,‘ one of'said arms having the major dimension
tures from said bight and’ means to adjustably advance
said clamping pin toward said one arm and secure said
clamping» pin in said aperture, said second aperture being
tapped for‘reception of a loading element.
References Cited in the ?le of this patent
transverse of its lengthperpendicular to the plane 'of the '
C, the other of said arms having the major dimension
transverse of its length parallel to 'the»plane of the'G
to adapt it for loading parallel to the length of the bight,
Bach _______ __v_______ __'May 8, 1945
said one arm having a smooth, substantially ?at ‘face most ;
Tracy ____________ __.___ Apr. '15, 1952
Worthen _____ __, ______ __ July 15, 1959
remote said other arm, said face de?ning the outermost
limit ‘of said clamp in the dimension normal to the plane
of the C and. most remote from said other arm, whereby
said one armcan be moved between said face of said 55
Subick ______________ __ Sept. 12, 1933
. 373
Great Britain _________ __‘_'Jan. 5‘, 1906
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