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Патент USA US2411838

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294119938
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Nov. 26, 1946.
R. C. SWENGEL
TOOL
Filed Feb. 5, 1944
2,411,838
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2,411,832!l
Patented Nov. 26, 1946
UNITED STATES PATENT DFFICE
2,411,838
TOOL
Robert C. Swengel, Harrisburg, Pa., assignor to
Aircraft-Marine Products, Inc., Harrisburg, Pa.,
a corporation of Pennsylvania
1
Application February 5, 1944, Serial No. 521,219
3 Claims. (Cl. 81-15)
2
The present invention relates to an improve
ment in crimping tools, more particularly to a
type employed in securing terminal pieces to end
further object has been to provide a crimping
tool having the advantageous features above re
,ferred to and which is simple and rugged and
portions of electrical conductors, as wires, cables,
inexpensive to make.
or the like, without the use of solder and by 5
In this specification and the accompanying
crimping or pressing the ferrule portion of a ter
drawing, I have shown and described a pre
minal around said end portions of the wire.
ferred embodiment of my invention and various
A known form of manually operated crimp
modifications thereof; but it is to be understood
ing tool for this purpose provides two sets of
that these are not intended to be exhaustive
crimping dies, one set for crimping a part of the
nor limiting of the invention, but on the con
ferrule around an insulated portion or sheath
trary are given for purposes of illustration in
oi' the wire, and the other set for coining an
order that others skilled in the art may fully
other part of the ferrule directly upon a portion
understand the invention and the principles
of the metal core which has been stripped of
thereof and the manner of applying it in prac
its insulation or sheath. Such a tool is described
tical use so that they may modify and adapt
in Patent No. 2,359,083 to Vernon E. Carlson.
it in various forms, each as may be best suited
In using said tool, the dies of which are nor
to the conditions of a particular use.
mally biased to open position, the wirel end
In the accompanying drawing, in which a sat
initially assembled with the ferrule portion of the
isfactory form of crimping tool embodying the
terminal to be secured thereto, is brought be
invention for achieving the above objectives is
tween the dies of said sets. That part of the
set forth:
ferrule which embraces the sheath is crimped
Figure 1 is a view in perspective, with handle
thereon by the set of diamond crimping dies;
and another partgof the ferrule embracing the
bare core is crimped thereon and materially de
formed by the set of coining dies which also im
part corresponding deformations to the core.
Figure 2, a side elevation of the parts shown
in Figure 1;
Figure 3, a sectional view through the center
of the dies showing the crimping dies, the fer
This manner of ferrule crimping produces a
desirably secure and low resistance connection
rule guide plate, and a terminal with its ferrule
in operative position to be crimped by said dies
portions omitted;
between the terminal and the wire. However, 30 on the end of a wire;
the coining produces an elongation of the fer
Figure 4 is a view similar to Figure 3 but show
rule, and this has made it diiiicult to design
ing the tool and ferrule at the end of the crimp
jigs for locating the ferrule relative to the dies,
ing operation; and
in particular necessitating use of springs to ab
Figure 5, a view in perspective of a terminal
sorb such elongation and prevent the terminal
secured by crimping on the end of a wire.
from jamming between the dies and the jig.
The crimping tool illustrated in the drawing
Moreover, a different jig is required for each
comprises opposed die carrying jaws pivoted to
terminal. Where different terminal ends are
a pair of handle grips I which are themselves
being connected to the same size wire this un
pivoted at 2 and normally biased to extended or
necessarily multiplies the number of tools re 40. open position. Tie plates 3 are pivoted to the
quired.
jaws at 4, so that said jaws can fulcrum against
One object of the present invention has been
each other when acted upon by the handles.
to provide a crimping tool which may be em
The outer ends of said jaws carry sets of crimp
ployed to produce the combined diamond crimp
ing dies, one set being the opposed diamond
and ferrule coining on different types of ter 45 crimping dies at 5 and 6 and the other set being
minals without jamming in the tool. Another
the opposed coining dies 'l and 8.
object has been to provide such a tool with de
A guide plate provided with a slot open at one
vices by which the terminal may be more quick
end and secured at one side of die 8 has a stop
1y and accurately inserted in the tool in position
portion 9 adjacent to the path of crimping move
to be crimped into secure engagement with the
ment of die 1 toward die 8, and against which
wire end. Where the terminal employed com
one end of ferrule I0, Figure 3, abuts when po
prises a ferrule and an attaching tongue, as is
sitioned in the tool for crimping. One side or
usual, a further object has been to utilize the
edge 9a of said slot opposite stop portion 9 and
tongue in quickly and eiîectively positioning the
a shelf or flange ll projecting laterally there
ierrule for crimping in the crimping tool'. A 55 . from, by engaging the tongue l2 when in crimp
S.
3
2,411,838
ing position, predetermine the angular relation
of the crimps formed in the ferrule to said tongue.
Or, said edge 9a alone and without ilange I I, may
4
bination with a pair oi jaws movable one to
ward the other and defining a forming recess
therebetween and each being provided with a fer
rule-coining die portion in opposed relation to a.
corresponding die portion of the other, of a fer
serve the same purpose by engaging and properly
positioning the base portion I4 of tongue I2.
The closed end I3 of the slot serves at the same
rule positioning guide plate supported by one oi'
time as a stop to position the ferrule in coaxial
said jaws and having a ferrule engaging stop
relation to the dies by engaging the side of the
portion arranged in laterally overlapping relation
tongue I2 when the terminal is inserted in the
to said forming recess; said stop portion having
tool for crimping.
10 an edge substantially parallel to and spaced from
'I‘he clearance between the jaws adjacent
the die portion of the supporting jaw by an
crimping dies 5 and 6 when in normal open rela
amount slightly less than the over-all cross
tion is such that a ferrule of appropriate size is
sectional height of a ferrule to be crimped.
properly inserted endwise from the right, Figure
2. In a crimping tool for securing a. terminal
3, and moved to the position there shown The 15 having a ferrule to a wire or the like, the com
ferrule is stopped at this proper position by the
bination of a pair of jaws movable one toward
edge of the ferrule Il) -abutting the stop 9.
the other and deiining a forming recess there
As the jaws come together in crimping, the
between and each being provided with a ferrule
diamond crimp dies 5 and 6 effect a constricting
coining die portion in opposed relation to a die
grip indicated at 5a (see Figure 5) on that por 20 portion of the other, and a guide plate secured
tion of the ferrule engaged by them while the
to one of said jaws and provided with a slot open
coining dies 1 and 8 partially flatten and ap
at one end and closed at the other; a ñrst edge
propriately defonn that other portion of the fer
of said slot being substantially flush with the
rule engaged by them as indicated at 'la in Fig
most recessed die portion of the jaw to which said
ure 5. A progressive elongation of the ferrule is 25 guide plate is attached and a second edge of said
thereby produced which could cause jamming of
slot being spaced from said .ñrst edge by an
the coined portion between the dies and the in
amount slightly less than the over-all cross
terior guide face or stop 9, except that the effec
sectional height of a ferrule to be crimped.
I.
g
i
l
.,
tive extent of said stop where it engages the fer
3. In a crimping tool for securing a terminal
rule I0 is such that when said ferrule is flattened 30 having a ferrule to a. wire or the like, the com
by initial compression between dies ‘I and 8, it is
bination of a pair of jaws movable one toward
pushed below the edge of and thus disengaged
the other and deñning a forming recess there
from said stop 9 and may therefore be further
between and each being provided with a ferrule
deformed without jamming as the crimping and
coining die portion in opposed relation to a die
coining are completed.
35 portion of the other, and a guide plate secured
One eiîect of crimping and coining is to flatten
to one of said jaws and provided with a slot open
the ferrule toward an axial plane parallel with
at one end and closed at the other; a ñrst edge
the plane of tongue I2, so that the wire end with
of said slot being substantially ñush with the
a terminal secured thereon may be freely and
most recessed die portion of the jaw to which
easily ldisengaged from the tool and pulled out 40 said guide plate is attached and a second edge of
through the end when the dies are returned to
said slot being spaced from said ilrst edge by an
normal open position. In the form shown, this
amount slightly less than the over-all cross
mode of removal is facilitated by the provision
sectional height of a ferrule to be crimped, and
of said slot in the guide plate with its open end
said closed end of said slot being arranged with
adjacent to the open end of the jaws.
respect to said forming recess to provide an abut
I claim:
ment for positioning the terminal in proper axial
l. In a crimping tool for securing a terminal
relation to the dies.
having a ferrule to a wire or the like, the com
ROBERT C. SWENGEL.
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