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Патент USA US2134655

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Oct. 25, 193.
29134,;655
N. A.YTORNBLOM
CABLE‘ CONNECTER
7
Filed April’ze, 19:57
FE :
Patented Oct. 25, 1938
,
‘ 2,134,655
UNITED STATES PATENT. OFFICE
,,
2,134,655
7
CABLE CONNECTER
Nils A. .Tornblom, Chicago, Ill., assignor to Ap
pleton' Electric Company, a corporation of Eli“
11015
Application April 29,‘ 1937, Serial No. 139,658
2 Claims. (Cl. 285-65)
A means for connecting cables to connection
boxes, that has long been widely used, consists
of a sleeve adapted to be secured to the wall of
a box, and a U-shaped clamp; one arm of the
5%: clamp lying? within the‘ outer or free end of
the sleeve and the other arm being on the ex
terior; both arms extending lengthwise of the
sleeve and a wall of the sleeve being, of course,
positioned between the arms. A screw passes
10 freely through the outer arm and through a
screw-threaded opening in the underlying wall
of the sleeve, the inner end of the screw being
adapted to engage with the inner arm of the
clamp‘ and press it down against a cable or
the like lying within the sleeve. It will be seen
that there is no effective guiding or holding
means for the clamp, aside from the loose con
nection between one arm thereof and the screw.
One disadvantage of this is that if it is desired
20 to disconnect a cable and the clamping screw
is insufficiently loosened, the inner arm of the
clamp may be carried outwardly along with the
cable, thereby distorting the clamp and requir
ing it to be bent back into shape before the same
25 or another cable is again inserted in the sleeve.
The object of the present invention is to im
prove this old type of connecter so as to over
come the objection or disadvantage just noted
and make it otherwise more satisfactory.
In carrying out my invention I so construct
the clamp and the sleeve that the inner arm of
in connection with the accompanying drawing,
wherein:
Figure 1 is a side elevation of a connecter em
bodying the present invention; Fig. 2 is a longi
tudinal central section through the connecter;
Fig. 3 is a section on line 3—3 of Fig. 1; Fig. 4
is a plan view of the sleeve; and Fig. 5 is a per
spective view of the U-shaped clamp.
Referring to the drawing, i represents a sleeve
adapted to be attached in any suitable manner 10
to the wall of a box or. the like. Cooperating
with the sleeve is a short, wide U-shaped clamp 2,
the arms of which extend longitudinally of the
sleeve, the arm 3 on the inside of the sleeve
and the arm 4 on the outside. A screw 5 ex 15
tends freely through a hole 6 in the arm 4 and
through a screw-threaded hole ‘I in the wall of
the sleeve. The inner end of the screw is
adapted to engage with the arm 3 of the clamp
and force it against a cable or the like underly 20
ing the same within the sleeve. The construction
as described up to this point is old and well
known, the present invention having to do with
interlocking the clamp and the sleeve so‘as to
improve the action of the connecter. In the pre 25
ferred form of the invention, I provide the arm
3 with two parallel ?ngers 8, 8 projecting at right
angles therefrom toward the arm 4, these ?ngers
the clamp is positively held against being pulled
lying on opposite sides of the screw when the
parts are assembled. The wall of the sleeve has 30
therein a pair of slots 9, 9 which may be entered
out with a cable engaged thereby, without inter
fering with the free movement of that arm from
35 and toward the overlying wall when'this is per
mitted by the adjustment of the screw. In the
a length that the distance between the free ends
of the ?ngers and the arm 4 is approximately
equal to the thickness of the wall of the sleeve. 35
30
preferred construction the wall overlying the
inner arm is provided with one or more holes
through which extend ?ngers?xed to the inner
40 arm of the clamp. The ?nger or ?ngers pref
erably lie at right angles to the arms and are
therefore parallel with the screw when the parts
are assembled. In this arrangement both arms
of the clamp are anchored to the sleeve, the one
45 by means of the screw, and the other by means
of the ?nger or ?ngers, preventing the clamp
from being shifted lengthwise of the sleeve and
also holding the clamp in what may be termed a
centered position.
50
The various features of novelty whereby my
invention is characterized will hereinafter be
pointed out with particularity in the claims; but,
for a full understanding of my invention and
of its objects and advantages, reference may be
55 had to the following detailed description taken
by the ?ngers. The ?ngers may be made of such
Consequently, the clamp and the sleeve may be
assembled by slipping theperforated section of the
wall of the sleeve between the free ends of the
?ngers and the arm 4 and then inserting the
screw. The clamp cannot rock far enough to 40
bring the ?ngers out of registration. with the
slots in the wall of the sleeve, so- that the clamp
may at any time be lifted from its lowermost
position as high as the screw will permit, even
though the connecter should happen to be em 45
ployed to hold a cable.
Whenever the connecter is holding a cable of
any of the sizes for which it is adapted, the
?ngers extend into or through the slots in the
wall of the sleeve and therefore anchor the inner 50
arm in such a manner that it cannot be moved
lengthwise of the sleeve and be pulled. out with a
cable.
The clamp is conveniently made from a single
piece of plate metal cut into the proper shape 55
2,134,655
2
while ?at and then bent or folded to give it its
?nal form. Furthermore, the ?ngers may be lo
cated outwardly from the corresponding planes
of the long edges of the arms of the clamp, there
by increasing the width or thickness of the clamp
until it is almost as great as the little pocket It]
by which the interior of the sleeve is enlarged to
receive the leg 3 when the clamp is lifted to its
upper limit.
It will be seen that the clamp costs no more
10 than the old type of plain U shape, excepting
only that it contains a very small additional
amount of metal. However, the completed con
15
necter is much more rugged, more effective in
performing the intended functions and more eas
ily operated, than is the old style.
While I have illustrated and described with
particularity only a single preferred form of my
invention, I do not desire to be limited to the exact
20 structural details thus illustrated and described;
but intend to cover all forms and arrangements
which come within the de?nitions of my inven
tion constituting the appended claims.
25
I claim:
1. A connecter comprising a sleeve, a U-shaped
clamp having one arm within the sleeve and the
other arm on the exterior of the sleeve with a
Wall of the sleeve located between the arms, the
outer arm of the clamp having a hole therein, a.
screw passing freely through said hole and
through and in screw-threaded relation to said
wall for engagement with the inner arm of the
clamp, said wall having a second hole therein,
and a ?nger parallel to the screw ?xed to the
said inner arm and extending through said sec 10
ond hole.
2. A connecter comprising a sleeve, a U-shaped
clamp having one arm within the sleeve and the
other arm on the exterior of the sleeve with a
wall of the sleeve located between the arms, the 15
outer arm of the clamp having a hole therein, a
screw passing freely through said hole and
through and in screw-threaded relation to said
wall for engagement with the inner arm of the
clamp, said wall having two additional holes sym 20
metrically disposed with respect to the screw hole,
and two ?ngers ?xed to the inner arm of the
clamp and. extending through said two additional
holes in parallel relation to the screw.
NILS A. TORNBLOM.
25
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