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Патент USA US3055422

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Sept- 25, 1962
D. DIBNER
3,055,412
DIE ASSEMBLY FOR CRIMPING A SHIELDED CABLE
Filed July 22, 1954
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INVENTOR.
.DAVID DIBNER
HIS ATTORNEY
United States Patent 0
1
3,055,412
DIE ASSEMBLY FOR CRllVIPlNG A
SHIELDED CABLE
David Dibner, Wilton, Conn., assiguor to Burndy
Corporation, a corporation of New York
Filed July 22, 1954, Ser. No. 444,991
1 Claim. (Cl. 153-1)
My invention relates to a novel crimp for securing con
nectors or ferrules to a coaxial cable. Ordinarily, these
connectors are crimped with a die having interlocking
teeth or leaves operating in corresponding grooves which
produce circumferential and staggered indentations on
3,055,412
Patented Sept. 25, 1962
2
leaves, namely 14 and 16, respectively, which when the
dies are closed, mate or interlock with each other into
slots 15 and 17, respectively, providing semi-cylindrical
crimping surfaces 18 and 19 outlining a hole 20 which is
less than the original diameter of the connector being
crimped. As shown in FIGS. 5 and 6, the crimp 21
caused by leaves 14, and crimp 22 caused by leaves 16,
compress the connector 23 around the shielded wires 24 of
the coaxial cable 25.
Beyond the crimping teeth 14 and 16,’ there are pro
vided corresponding grooves 26 and 28, respectively, con
centric with and larger than hole 20 for swaging the end
surfaces 27 of the connector into cylindrical position dur
ing crimping. The dies are limited in their closing move
the outer surface of the connector. If one end, or possibly
both ends of the ferrule are located over one of the grooves 15 ment by ?at surfaces 30 and 32, respectively, provided
in the die, the ferrule will bend into this groove under
on opposite spaces thereof.
the crimping force and result in a ?are or bell being
When the annealed copper ferrule 23 is placed over
formed in the connector edge. This condition is objec
the shielding wire 25 of the coaxial cable 26 and then
tionable because wiring assemblies or harnesses employ
between the dies 10 and 12 in their open position, the
ing large numbers of such ferrules are frequently packed 20 ferrule is located by the operator placing it approximately
tightly together, increasing the possibility of the sharp,
over the surfaces 18.
When the dies 10 and 12 are
?ared edge of the installed ferrule cutting into the ad
jacent cable and producing a short circuit. The trend
towards closely packing cables is a result of greater
pressed together by the accommodating installation tool,
rial ?ows to form a ?ash, causing a cross-sectional con
as to provide a smooth, cylindrical appearance at the ends
not shown, the ferrule is ?rst squeezed or crimped by the
edges of the interlocking surfaces 18 and 19. When the
miniaturization in electronic design. This problem is 25 ferrule is under compression from the teeth, it tends to
almost solely con?ned to the smaller shielded or coaxial
buckle as a result of the deformation being applied to
cables where the cables are unable to resist the cutting of
it. This normally results in the ?aring, ?ashing or bell
the ?ared ferrules.
ing which has previously been considered objectionable.
At present, two types of die crimps are commercially
However, in my new device, the ends of the ferrule are
available for such connectors. One employs symmetrical 30 contained and controlled by the swaging grooves 26 and
grooves which close down on the ends of the connectors.
28 which reduce the diameter of the ferrule enough to
Pockets are laterally provided into which the excess mate
close the ferrule around the cable, but in such a way
?guration of the cable that is almost oval, with two ?ash
of the ferrule and to avoid any belling or ?ashing as
elements extending therebeyond. I have found this type 35 was previously experienced. Note that in my design, not
of crimp to be objectionable, for the connector should
only are ?ash pockets avoided in the swaging grooves
not provide an extension or edge which could do damage
which would allow room into which the ferrule would
to an adjacent cable.
expand and therefore result in ?ash projection, but the
The other present type avoids the ?ash by providing a
swaging grooves are provided with sharp edges which
hexagonal crimp. I ?nd that this type of crimp is objec
maintain the ferrule in a cylindrical form without allow
tionable because the six corners of the connector pro
ing it to ovalize or ?ash. This design maintains the fea
vide sharp points which also can damage adjacent wires in
tures and advantages of the interlocking teeth type of
a harness assembly.
ferrule crimping die and also achieves a method of reduc
Accordingly, the principal object of my invention is
ing the diameter of a cylindrical ferrule by swaging with
to produce a crimp for a coaxial cable connector which 45 out deforming the ends of the ferrule in such a way as
will reduce or eliminate the present type of belling, ?ar
ing or ovalizing, which exposes sharp edges, or points
which damage adjacent cables.
to be damaging to conductors placed adjacent to it.
I have thus described my invention, but I desire it un
derstood that it is not con?ned to the particular forms or
These and other objects of my invention are accom
uses shown and described, the same being merely illus
plished and my new results obtained as will be apparent 50 trative, and that the invention may be carried out in other
from the device described in the following speci?cation,
particularly pointed out in the claim, and illustrated in
the accompanying drawing, in which:
FIG. 1 is a side elevation of a pair of crimping dies
in open position for incorporating my invention.
FIG. 2 is a longitudinal sectional view of the same.
FIG. 3 is a side elevation of the dies of FIG. 1 in
closed position.
ways without departing from the spirit of my invention,
and, therefore, I claim broadly the right to employ all
equivalent instrumentalities coming within the scope of the
appended claim, and by means of which objects of my
55 invention are attained and new results accomplished, as
it is obvious that the particular embodiments herein shown
and described are only some of the many that can be
employed to attain these objects and accomplish these re
FIG. 4 is a longitudinal sectional View of the same.
sults.
FIG. 5 is a perspective view of the upper die of FIG. 1. 60
I claim:
FIG. 6 is a side elevation of the crimp forming my in
A pair of crimping dies for crimping a connector to a
vention on a coaxial cable connector.
shielded cable, each die comprising a plurality of extending
In the drawing FIG. 1, there is illustrated a pair of die
interspaced slots and leaves, each of said slots accom
bases 10 and 12, each provided with plate-like teeth or
modating a leaf from the mating die, said leaves provided
3,055,412
compressing a cylindrical connector to a coaxial cable
963,394
2,359,083
2,390,598
2,457,538
2,480,280
2,639,754
into a cylindrical shape free of ?aring, belling and ?ashing.
2,692,422
with semi-cylindrical crimping surfaces, said dies pro
vided with semi-cylindrical grooves on a side of the dies,
for compressing the uncrimped ends of the connector
body in a perfectly cylindrical shape, concentric with and
slightly larger than the crirnped surfaces, said die parts
References Cited in the ?le of this patent
UNITED STATES PATENTS
368,987
533,910
Wheeler ____________ __ Aug. 30, 1887
Metzger ______________ .__ Feb. 12, 1895
‘
4
Richardson __________ __ July
Carlson _____________ __ Sept.
Lepkowski ___________ __ Dec.
Dupre _______________ __ Dec.
Bergan ______________ ___ Aug.
Macy _______________ .__ May
5,
26,
11,
28,
30,
26,
1910
1944
1945
1948
1949
1953
2,704,358
Pierce ______________ __ Oct. 26, 1954
Wells _______________ __ Mar. 15, 1955
412,678
Germany ____________ __ Apr. 24, 1925
FOREIGN PATENTS
10
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