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Патент USA US3084964

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April 9, 1963
A. l. APPLETON
3,084,958
CLAMP ASSEMBLY FOR ELECTRICAL. BOXES AND THE LIKE
Filed March 30. 1960
IN VEN TOR.
ARTHUR LAPPLETON
aim wvam
ATTYS.
United States Patent 0 "ice _
3,084,958
Patented Apr. 9, 1963
2
1
3,084,958
CLAMP ASSEMBLY FOR ELECTRICAL BOXES
AND THE LIKE
Arthur I. Appleton, Northbrook, Ill. (f?; Appleton Elec
tric Co., 1713 Wellington Ave., Chicago 13, 111.)
Filed Mar. 30, 1960, Ser. No. 18,602
1 Claim. (Cl. 285-189)
or ?exible conduit within the box, clamp assemblies 81
are provided, one such assembly being adjacent each pair
of knockout openings 83 in the back wall panel 88 of
the box. Each clamp assembly comprises a jaw 84 hav
5 ing a pair of integral arcuate shoes 85 for engaging the
cable or conduit and a stiffening wing 86 disposed at an ob
tuse angle to the plane of the shoes 85. The wing 86 may
also have a slightly downturned edge portion adapted to
bear against the back wall of the box as the jaw 84 is
The present invention relates to clamping devices for
holding the terminal ends of conduit, cable or tubing 10 tightened. The jaw 84 is mechanically connected to the
back wall ‘88 of the box by means of clamping screw 89.
and, more speci?cally, to a novel clamp ?nding particular
utility in securing the ends of cable and conduit within
electrical connection boxes.
The latter extends slidably through an opening 90 and
engages a tapped hole 91 in the back wall of the box.
For initially positioning the clamping jaw 84 in the box
sembly of the type set forth and which will permit the 15 in proper position for use and ?rmly but yieldably hold
ing the jaw in such position, the assembly 81 is provided
same to be initially installed and subsequently yieldably
with a positioning disc 92. The latter is adapted to yield
held in proper position for use so that all the user need
ably engage the mounting screw 89 after the manner of
do is tighten the clamping screw.
the discs 40, 49 and 71 described earlier herein. For this
Another object is to provide a clamp assembly of the
above type and having initial positioning means which 20 purpose, the disc 92 (FIG. 5) has a central aperture 94
and a plurality of radial slits 95 de?ning a corresponding
will be absolutely safe and when put into operation will
plurality of prongs 96. To etiect positive engagement be
not interefere with the operation of the clamp or any
tween the disc 92 and the jaw 84, the disc is provided with
wiring with which the same may be used.
diametrically opposed, outwardly extending tabs 98. The
A further object is to provide a device of the above
character and which will be extremely simple and capa 25 latter are adapted for insertion into a corresponding pair
‘One object of the invention is to provide a clamp as—
ble of economical manufacture on a mass production
basis.
Other objects and advantages will become apparent as
of slots 99 situated in the jaw 84 on either side of the
central screw opening 90. With this arrangement, the
disc 92 is positively prevented from rotation relative to
the jaw 84 upon tightening of the clamping screw 89.
the following description proceeds, taken together with
30 While the disc 92 has been illustrated in a position be
the accompanying drawing wherein:
FIGURE 1 is an enlarged perspective view of an elec
trical connection box including clamping devices which
illustratively embody the invention, one side wall of the
box being removed for purposes of illustration.
tween the upper face of the jaw 84 and the head of the
clamping screw 89, it will be appreciated that the disc
could also be positioned under the lower face of the jaw
and perform satisfactorily.
Turning next to FIGS. 6 and 7, there is shown a further
FIG. 2. is a side elevational view of the box of FIG. 1, 35
modi?ed clamp assembly 100 somewhat similar to the
taken from the removed side.
assembly 81 just described. In this instance, the assembly
FIG. 3 is an enlarged fragmentary vertical sectional
100 includes a jaw 101 similar to the jaw 84 and which
view through the clamp assembly of the box shown in
is mechanically connected to the back Wall 102 of the box
FIG. 1, such view being taken in the plane of the line
by means of a clamping screw 104. The jaw 101 in this
3—-3 in FIG. 4.
instance is yieldably positioned on the clamping screw
FIG. 4 is an enlarged plan view of the clamp assembly
104 by means of positioning disc 105 generally similar
of the box shown in FIG. 1.
to the discs described earlier herein. ‘In this instance,
FIG. 5 is an enlarged plan view of the positioning disc
however, the assembly depends simply upon frictional
of the clamp assembly shown in FIGS. 14, inclusive.
FIG. 6 is an enlarged fragmentary vertical sectional 45 contact between the disc 105 and the underside of the jaw
101 to oppose the tendency for relative rotation upon
view similar to FIG. 3 but showing a modi?cation of the
tightening of the clamping screw 104.
clamp assembly.
I claim as my invention:
FIG. 7 is an enlarged plan view of the positioning disc
In an electrical connection box having a wall with
of the clamp shown in FIG. 6.
While the invention is susceptible of various modi?~ 50 openings therein for receiving the terminal ends of cable
or ?exible conduit, a clamp assembly comprising, in com
cations and alternative constructions, certain illustrative
bination, a clamping jaw having a screw opening therein,
embodiments have been shown in the drawing and will
said jaw having a pair of diametrically opposed slots
be described below in considerable detail. It should be
therein on either side of said screw opening, a clamping
understood, however, that there is no intention to limit
the invention to the speci?c forms disclosed, but on the 55 screw having a head and a shank, said clamping screw
contrary, the intention is to cover all modi?cations and
being disposed with its shank projecting through said
screw opening and into threaded engagement with said
box wall, a positioning disc of relatively resilient mate
rial having an aperture receiving said screw shank, said
appended claim.
Referring more speci?cally to FIGS. 1 to 5, inclusive, 60 disc having a plurality of circumferentially spaced slits
radiating from said aperture and de?ning therein a plu~
the invention is there shown illustratively embodied in
rality of prongs, said disc being positioned with said
an electrical box 82 which in this instance happens to be
adapted for housing a switch or receptacle. For the
prongs coplanar with the remainder of said disc and in
yieldable threaded engagement with said shank, and a
purpose of anchoring one or more terminal ends of cable
alternative constructions and equivalents falling within
the spirit and scope of the invention as expressed in the
3,084,958
3
pair of diametrically opposed tabs integral with said disc,
saidv disc being positioned on said screw shank with one ,
face thereof in contact with said jaw and with said tabs
positively locked in said slots, whereby relative rotation
between said jaw and said disc is precluded.
References Cited in the ?le of this patent
UNITED STATES PATENTS
256,149‘
Long ________________ __ Apr. 11, 1882
41
794,172
913,024
Frick ________________ __ July 11, 1906
1,612,761
Fisher ....; _____________ __ Dec. 28, 1926
Thomas __v _____________ _~ July 8, 1930
1,770,115
1,783,408
2,176,411
2,437,073
2,917,267
Meachurn _____________ .. Feb‘. 23, 1909
Cook ________________ __ Dec. 2,
Washer _______________ __ Oct. 17,
Carlson ______________ __ Mar. 2,
Riddle ______________ __ Dec. 15,
1930
1939
1948
1959
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