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Патент USA US3089542

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May 14, 1963
N, C. GRAEFF
DIES FOR CRIMPING ELECTRICAL CONNECTORS
Filed Feb. 25} 1960
2 Sheets—Sheet 1
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INVENTOR.
Nora/00d C Graeff
BY
M Wk 2
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I
May 14, 1963
N‘ C. GRAEFF
3,089,532
‘
DIES FOR CRIMPING ELECTRICAL CONNECTORS
Filed Feb. 25, 1960
2 Sheets-Sheet 2
in
INVENTOR.
Bil/Vorwood C raeff
. O
United States Patent 0 M C6
1
assassa
Fatented May 14, 1963
2
closed~ position abut the top of the nest to prevent over
3,959,532.
crimping.
When it is desired to crimp a ferrule and conductor
DIES FUR CRIMPING ELECTRICAL
CGNNECTURS
in the dies, the conductor is inserted into the ferrule
Norwoed Q. Grae?, Port Trevor-ton, Pan, assignor to
AMP Incorporated, Harrisburg, Pa.
Filed Feb. 23, 196i), §er. No. 1933i)
1 Claim. ((11. 153M313)
and the ferrule placed between the dies. The dies are
brought together until the lands 3i) and 32 abut the
top of the working surfaces 18 and 20‘ (FIGURE 3).
As shown in FIGURE 3, the ?at land surfaces
and
In cold-Welding electrical ferrule~type connectors onto
28 cause deformation of the outer strands of the conductor
conductors, it is customary to insert the conductor into 10 within the ferrule. The round working surface 24 causes
the ferrule and deform the connector onto the conductor
the same deformation of wire strands in the central por
by means of a pair of dies. It has been discovered that
tion of the conductor. The over-all effect is to provide a
prior known types of crimping dies have had serious dis
crimped section 4%} having a uniform deformation of wire
advantages, particularly when used on large-sized con
strands throughout the crimped cross-section. Also, the
ductors, -i.e., 4/0 and larger. It has been observed that
smooth, gentle design of the indenting die from the flat
it has been particularly di?ieult to crimp terminals of this
land portions 26 and 23 through the larger arcuate work
size because of the difficulty in the uniform reduction of
ing surface 24 prevents the crimping pressure from spring
wires, breakthrough of the tin plate, formation of metal
ing the U-shaped indenting die and causing it to frac
?ash, and deformation of the indenter. It is an object
ture after repeated crimping. Additionally, the tin plate
of this invention to provide a crimping die for electrical 20 on the outside of the erimpe-d ferruie is not punctured
connectors which will eliminate these undesirable char
or disturbed. The con?guration of the crimped section
acteristics. It is also an object of this invention to pro
does not provide any ?ashed surfaces of metal which
vide a crimping die which has a rounded crimping nest
would be harmful in an electrical connection.
and a crimping indenter which is round in the middle and
The form or embodiment of the invention shown in
25 FIGURES 5 and 6 is similar to that shown in FIGURES
?at on the outer edges.
Other objects and attainments of the present inven
1 and 4. Instead of a single, smooth die surface, a pair
of axially disposed die surfaces is provided which effect
tion will become apparent to those skilled. in the art upon
spaced, crimped sections 42, 44. Alternatively the crimp
a reading of ‘the following detailed description when taken
may be made in two stages, making each crimp separate
in conjunction with the drawings in which there is shown
ly. Thus the metal at each end of the crimped connec
and described an illustrative embodiment of the inven
tion is extruded, causing a considerable increase in the
tion; it is to be understood, however, that this embodiment
tensile strength of the connection.
is not intended to be exhaustive nor limiting of the in
Changes in construction will occur to those skilled
vention but is given for purposes of illustration in order
that others skilled in the art may fully understand the 35 in the art and various apparently different modi?cations
and embodiments may be made without departing from
invention and the principles thereof and the manner of
the scope of the invention. The matter set forth in the
applying it in practical use so that they may modify it
foregoing description and accompanying drawings is of
in various forms, each as may be best suited to the con
ditions of a particular use.
fered by way of illustration only. The actual scope of
the
invention is intended to be de?ned in the following
In the drawings:
40 claim when viewed in its proper perspective against the
FIGURE 1 is a perspective view of a set of dies
prior art.
embodying the principles of this invention;
I claim:
FIGURE 2 is a front plan view of the dies shown in
A die set for crimping ferrule-type connectors onto
FIGURE 1 with a ferrule-type connector inserted there
conductors including: a ?rst nesting die having a con
between;
45
FIGURE 3 is a sectional view taken through plane
3—3 of FIGURE 4, illustrating the dies and connectors
of FIGURE 2 in crimped relationship;
FIGURE 4 is a top plan view showing an electrical
connector crimped onto a conductor with the die mem~
bers shown in phantom;
FIGURE 5 is a view similar to FIGURE 4 showing a
different embodiment; and
FIGURE 6 is a side view of FIGURE 5.
As shown in the drawings, the die set is comprised
of a lower die It} and an upper die 12 (FIGURE 1).
The bottom die 10 may be considered a “nest” and has
an arcuate working surface 14 which has a radius larger
cave arcuate bottom working surface and oppose-d side
surfaces tangent to the extremities and forming a con
tinuation of said arcuate working surface, a second in
denting die having opposed side surfaces narrower than
the opposed side surfaces of ‘the nesting die, an intermedi
ate concave arcuate working surface between the opposed
side surfaces of the indenting die, and a pair of parallel
lands on the indenting die adapted to relieve stress con
centration on the indenting die and distribute the crimp
ing force more evenly through the connector, said lands
being coplanar and disposed so that one land is on each
side of the arcuate working surface and extends from
an edge of the arcuate working surface to one of the
opposed side surfaces, whereby the connector may be
than the ferrule member 16. The working surface has 60 crimped onto the conductor Without the formation of
a pair of opposed side surfaces 18 and 20. A die hold
ing member 22 is secured to the die to mount the die in
a crimping tool.
The upper ‘die may be termed an “indenter.” The die
surface has an inner radial surface 24 which is equal to 65
the working surface 14. A pair of lands 26 and 28
project outwardly from the arcuate surface 24. The
width of the indenting die is slightly less than the distance
between the opposed working surfaces 18 and 2%} of the
nest. Thus the indenting die ?ts snugly into the nest 70
(FIGURE 3). Another pair of lands 3d and 32 ex
tends vfrom the sides of the indenting die, and in the
sharp side edges.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,242,280
2,426,492
Adams et al. ________ __ May 26, 1941
Dupre ______________ __ Aug. 26, 1947
2,534,867
2,732,615
Hennessey __________ __ Dec. 19, 1950
Sandberg ___________ __ Jan. ‘31, 1956
2,802,257
Holtzapple __________ __ Aug. 13, 1957
2,837,135
2,965,147
Demler _____________ __ June 3, 1958
Hoffman ____________ __ Dec. 20, 1960
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