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Патент USA US3070154

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Dec. 25, 1962
w. R. EVANS
3,070,144
LADDER STRIP APPLICATOR
Filed Feb. 11, 1960
2 Sheets-Sheet 1
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INVENTOR.
l/" WiHiam R. Evans
Dec. 25, 1962
w. R. EVANS
3,070,144
LADDER STRIP APPLICATOR
Filed Feb. 11, 1960
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3,070,144
rent:
Patented Dec. 25, 1962
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from the strip by a shearing blade which is also mounted
3,tl7tl,14ld
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on the ram and which moves with the ram towards the
LADDER §TR1P APPLICATUR
?xed crimping die. This shearing blade, however, is re
William K. Evans, Hershey, Pa, assignor to
AMP Incorporated, Harrisburg, Pa.
Filed Feb. 11, 1960, Ser. No. 8,094
1 Claim. (QB. 153ml)
siliently mounted on the ram and is provided with a stop
which prevents its movement toward the ?xed die during
the terminal portion of the stroke, during which the
shear is effected.
hi the drawing:
PiGURE l is a side view, with parts broken away,
onto the ends of wires.
10 of a preferred embodiment of the invention;
it is common practice to manufacture electrical con
FlGURE 2 is a frontal view taken along the lines 2-2
nectors and terminals in the form of a continuous strip
of FIGURE 1;
and to apply the connectors to the ends of wires by means
PEGURE 3 is a view showing the feed slide and lower
of a crimping press having a feeding device for auto
crimping die and taken along the line 3--3 of FIGURE 2;
matically feeding the strip towards the crimping dies of 15 FlG-URES 4 and 5 are fragmentary frontal views
the press. Conventional presses of this type usually have
similar to FlGURE 2 but on an enlarged scale, and illus
a ?xed die or anvil, and a movable crimping die which
trating the positions of the parts at different stages of the
This invention relates to crimping devices for crimp
ing electrical connectors ‘and terminals in strip form
is mounted on the ram of the press. The feeding means
crimping cycle;
is commonly actuated by the press ram and is immovably
mounted on substantially the same level as the ?xed die
FiGURE 6 is a sectioned end view taken along lines
6-—6 of FIGURE 2;
of the press so that the leading connector of the strip
is fed and positioned over the ?xed die and in position
for the crimping operation. Most of the available presses
of this type are relatively large in that they are intended
strip of terminals of the ladder strip type;
FiGURE 7 is a perspective view of a portion of a.
FIGURE 8 is a fragmentary view showing a camming
means for disengaging the feed pawl from the strip; and
FIGURE 9 is a fragmentary perspective view showing
an ejector which forms part of the preferred embodi
to be permanently mounted on a bench or the like and
are not intended to be portable. A necessary feature
of such presses is a shearing means for shearing the
merit.
leading connector of the strip of connectors from the
FTGURE 7 shows a portion of a ladder strip of the
strip at the time of crimping. The connector strip, it
type which the disclosed embodiment of the invention is
self, may be either of the end-to-end variety in which 30 intended to apply to wire ends. The terminals 116} of the
the connectors are axially aligned with each other, or of
strip are secured at regularly spaced intervals to a carrier
the ladder strip variety in which the connectors are
strip 1G4 and extend laterally of the carrier strip. Each
aligned in side-by-side parallel relationship and are
terminal provides ferrule-forming portions res, 1&8 to
secured either to each other or to a common carrier strip.
facilitate their being crimped onto a wire, and the carrier
The problem of shearing connectors from a carrier
end-to-end type of strip for reasons which will be ap
strip provides regularly spaced openings 1695 which are
engaged by a feed pawl to feed the strip towards the
crimping zone of the crimping apparatus. When the
leading terminal of the strip is crimped onto a wire end,
parent from the description of the instant invention given
this leading terminal must also be severed from the car
below.
An object of the present invention is to provide an
improved crimping press for crimping electrical con
portion which extends beyond this leading terminal into
strip is, it might be added, somewhat more complex than
the problem of shearing the leading connector from an
nectors and terminals onto the ends of wires.
rier strip and it is advantageous to sever the carrier strip
short lengths to facilitate its disposal.
The disclosed embodiment for crimping ladder strip
terminals, as shown in FEGURE 1, comprises a tool body
2 in the form of a hydraulic cylinder having an integral
C-shaped head 4 on its end, which head has an inwardly
projecting portion 6 upon which the ?xed or upper dies
A further
object is to provide a crimping press which is particularly
adapted for ladder strip type terminals. A still further
object is to provide a crimping press having an improved
feed mechanism for the terminal strip which is par
ticularly adapted for usage in a portable-type crimping
are mounted. A ram ill is mounted within tool body
2 and extends from a hydraulic piston 12 which is nor
These and other objects are achieved in a preferred 50 mally biased downwardly by means of a spring 8. Hy
embodiment of the invention comprising a frame mem
draulic fluid is supplied from any suitable source (not
ber which may take the form of a hydraulic cylinder
shown) through a hose 13 to drive the piston and ram
press.
having a generally ‘C-shaped head portion integral there
upwardly during use.
with. A ram which is reciprocable within the frame or
cylinder has a movable crimping die mounted on its end i
for cooperation with a ?xed crimping die which is
mounted on the head portion of the tool. The strip
feeding means is mounted on, and contained in, a sup
port which is secured to the end of the reciprocable ram
and extends laterally thereof, and which moves with
the ram towards and away from the ?xed crimping die
during use of the tool. The strip of terminals is fed
along a feed path on ‘this support, which feed path leads
to a position between the two crimping dies. The lead
A generally L-shaped die holder is is mounted on the
end of ram lit‘ and has a pair of fins 15 extending there
from towards the head 1i of the tool. The opposed sur
faces of these ?ns bear against flat surfaces on the sides
of the tool head to maintain the ram in alignment with
the ?xed dies and to guide the ram toward and away
mounted on
60 from the ?xed dies. A movable die
die holder M by means of a die block 13 having a re
cess therein for the accommodation of the lower die,
this die block being secured to the holder 14 by means
of a fastener
Upper dies 22.24 are secured to an
ing terminal of the strip is thus positioned between the 65 upper die holder 2.6 which, in turn, is secured to the in—
dies and is held in this position prior to closure of the
ward projection e of the tool head.
dies by virtue of its being a member of the strip. Upon
The ladder strip supporting and feeding mechanism is
actuation of the tool, the ram moves toward the ?xed
crimping die and carries with it the
terminal is gripped between the dies
during subsequent movements of the
aligned. The leading terminal is at
mounted on a support
having a back wall 29 from
terminal until the
which extends an integral platform or rib 3%. A ?ange
so that it can not, 70 32 on this rib is secured to die holder 14 by means of
a fastener as shown, so that the entire support 28 moves
ram, become mis
with the ram towards and away from the ?xed dies dur
that point sheared
3,070,144
3
ing use.
Advantageously, a roller 25 is provided on a
plate 58 (described below) which bears against an
L-shaped plate 27 secured to the back wall 29 of the
support to assist in maintaining the support in proper
Li.
plate 72 which is secured to the back plate of the hous
ing, and by means of a slot or groove 75 which is formed
by an inward projection on the front plate and by a de
pending projection 73 of the top plate. This slot receives
the carrier strip Iii-t of the ladder strip and guides the
strip toward the crimping Zone. It will be noted that
the depending ?ange '73 of the top plate provides a slot
for the accommodation of the tip '71 of the feed pawl
‘alignment with respect to the ram. The feed path for
the terminal strip is de?ned by an arcuate surface 33
on housing 2.8 which advantageously has rails 34, 35
cemented thereto to support the strip at its end and inter
which may extend through the spaced openings of the
mediate its end. These rails may be made of nylon
or the like to facilitate the travel of the strip over the 10 ladder strip and into this slot.
Referring now to FIGURES 2, 3 and 4, there is pro
surface of the feed track.
vided on the front of die holder 14 a generally L-shaped
Support 28 is cut away in the area immediately adja
plate 74 which is secured in place by means of fastener
cent the die holder 14, and a housing is formed in this
26, previously referred to. A ?xed shear block 7% is
area ‘for the feed ?nger by means of which the strip is
fed. This housing is composed of a front plate 36 15 mounted in the die holder and between plate 76 and die
block 18, and a relatively movable shearing block 80 is
which isis secured
secured by
to fasteners
rib or ?ange
through
3d,the
a wall
back
of the
provided above this ?xed shearing block, the relatively
movable block being normally biased upwardly by means
support, and a top plate 38 secured by screws to plates
of a spring 82 disposed within a recess in the movable
36 and 40. The opposing surfaces of back plate lid and
front plate 36 have rails 44, 45 integral therewith (FIG 20 block and which acts between a pin '77 in plate 74 and the
block itself. The movable shearing block is guided for
URE 6) to support, and de?ne a path of reciprocation
movement towards and away from the ?xed shearing
for, a slide plate 46' which may be of nylon or the like.
block by a ?ange 76 on plate 74. The blocks 78, 89
This slide plate is biased towards front plate 36 by a
provide a pair of cooperating shearing edges 81, 83, the
spring 46:: and is pivotally connected by means of a
edge SI being on an upward projection of the ?xed shear
link 48 to one end of a lever 5t? composed of a pair
of spaced apart plates, which is pivotally mounted on its
opposite end 52 in the support 28. Lover 56 is normally
ing block and the edge 33 being de?ned .by a recess
within the movable block which receives the projection
on the ?xed block. In normal use, the scrap carrier
biased in a counterclockwise direction by means of a
strip will extend beyond these edges when the parts are
spring 51 but can be rotated in a clockwise direction by
a stationary cam 56 secured to a plate 53 having a ?ange 30 in a position of FIGURE 4 and upon relative upward
movement of the ?xed block, the projecting portion of
which is bolted to the top portion of housing 2 and
the carrier strip will be sheared from the running length
which, therefore, does not move with the support 2%.
thereof. Movable shearing block 39 also provides an
Cam plate 56 has a cam surface 62 which bears against
arm 86 extending inwardly towards the crimping dies and
a cam follower 54 in the lower portion of the lever and
which causes the lever to be swung in a clockwise direc 35 substantially over the feed path of the carrier strip. A
shearing edge 84 on this arm is substantilly in the plane
tion during initial upward movement of the ram, as
of the face of ?xed die 16 so that, when the die moves
viewed in FIGURE 2. After this initial portion of the
upwardly relative to the ?xed die, a shear is affected in the
ram’s movement, this cam follower is engaged by cam
plane of the face of the die 16. This shear removes the
surface 63 and is not swung further. On the return
stroke of the ram, the lever Stl is maintained by surface 63 40 terminals being crimped from the carrier strip.
Relative movement of the movable shearing block is
‘in its retracted position until it again engages cam sur
achieved during the terminal portion of a stroke of the
face 62 during the ?nal portion of the downward stroke
ram towards the ?xed dies by means of a stop 38 on the
‘of the ram.
top of the movable block. During the upward stroke of
The actual feeding of the strip is accomplished by a
the ram, this stop comes to rest against the die block 26
feed pawl 64 which is pivotally mounted at 66 between
and prevents further upward movement of the movable
upstanding ears on a plate 68, which, in turn, is secured
block. During the remainder of the stroke, the mov
to slide 46. A spring 76 normally biases this feed pawl
able die moves upwardly relative to the block and the
upwardly and into engagement with the carrier strip, as
terminal is sheared, as shown in FIGURE 5.
shown in FIGURE 2. The end of the feed pawl 71 has
In crimping the type of connectors shown, at the end
a pointed tip portion which enters into the spaced open
of the crimping operation the crimped terminal will usu
ings 105 of the carrier strip we so that upon move
ally, if not always, be lodged within the recess in the
ment of this feed pawl, the strip is advanced toward the
?xed die and will be removable therefrom only upon its
crimping zone. In order to prevent retractile movement
of the terminal strip during retraction of the slide plate
46 and the feed pawl, there is provided a holding pawl
85 which is clamped to top plate 38 and which extends
downwardly to engage between the terminals of the strip.
An extension 87 extends upwardly from this drag pawl
‘through an opening in the top plate so that it can be
lifted out of engagement with the strip if it becomes
necessary to withdraw the end of the strip from the crimp—
ing zone. It is also necessary to disengage feed pawl
64 from the strip of terminals when the strip is manu
ally retracted. To this end, there is provided a pin 59
on the feed pawl which extends towards the front plate.
A cam plate 61 in a groove 63 in the front plate has an
inclined surface engageable with this pin so that upon
being pushed downwardly. While this operation can be
performed manually, it is desirable to provide an auto
matic ejector as shown at 96. This ejector comprises a
small plate having an arm which extends past the recess
of the ?xed die 24 and is normally disposed below the
level of this recess. A spring 98 within a spacer 92
normally biases the arm downwardly, as viewed in FIG~
URE l, but permits upward movement of the ejector
during crimping. An additional spacer 94 is provided
in the block to properly position the ejector and the
crimping dies relative to the ?xed crimping die and the
terminal. Since the spring 98 will normally not be will
ciently strong to push the terminal out of the upper die,
there is provided a plate Itl? on the die block 18 which
rightward movement of the plate (as viewed in FIGURE
has an arm I02 projecting toward the ?xed clie. An in
8), it engages the pin and depresses the feed pawl. A
ward extension on this arm passes over a lateral exten
screw 65 in plate 61 extends through a slot in the front 70 sion on the ejector so that, during the ?nal portion of
plate to permit the plate to be manually moved and a
the downward stroke of the ram, arm 162 pulls the ejec
spring washer 67 retains the screw and plate in position
tor downwardly thereby forcing the terminal out of the
when it is moved rightwardly.
?xed die.
As shown best in FIGURES 2 and 6, the terminal
In use, and assuming the parts are in the position shown
strip is supported by means of the surface of an L-shaped
in FIGURES 1 and 2, the operator ?rst positions the end
3,070,144
5
of a wire in line with the terminal and preferably within
the recesses of the ?xed dies 22, 24, the ejector which
extends down beyond the recess of die 24 functioning as
a stop for the end of the wire. Thereafter, the operator
actuates the hydraulic system to supply ?uid to the cyl
inder 2 and to drive the ram upwardly. During the
initial portion of the upward stroke of the ram, the arm
50 is swung in a counterclockwise direction by cam sur
nals. It is also contemplated that alternative types of
linkages might be used to actuate the feeding means for
the strip.
I claim:
A portable crimping apparatus for’ crimping terminals
in ladder strip form onto wires comprising, a cylinder, a
generally C-shaped head integral with said cylinder, a
?xed crimping die mounted on said head, a ram in said
cylinder reciprocable towards and away from said ?xed
face 62 to retract the slide 46 and the feed pawl 64. Dur
ing the terminal portion of the upward stroke, this lever 10 crimping die, a movable crimping die mounted on said
does not, of course, move. During the upward stroke
of the ram, the support 28 and the entire feed mecha
ram, supporting means mounted on, and extending later
ally of, said ram, said supporting means having a termi
nal strip feed track thereon leading to a location be
nism is carried upwardly until this terminal is gripped be
tween said dies whereby the leading terminal of a strip
tween the ?xed dies and the movable die. At this point
in the cycle, stop 88 comes to rest against block 26 and 15 fed along said track is positioned between said dies,
feeding means for said strip comprising a spring biased
further upward movement of the carrier strip portion
lever pivotally mounted on said support, a ?xed cam en
which extends past the dies is prevented, while the termi
gageable with said lever during movement. of said ram
nal itself is pushed upwardly and further into the upper
away from said ?xed crimping die to actuate said feed
portion of ?xed dies to complete the crimping operation.
ing means, a spring loaded shearing blade mounted on
During this portion of the cycle, the terminal is crimped.
said ram and having a shearing edge normally extend
At the same time, the previously fed section of the car
ing past said ?xed die, and a stop for said shearing blade
rier strip which extends beyond the edges 81, 83 is sheared
e?ective during movement of said ram towards said ?xed
and drops through this slot shown in the ?xed shearing
die to prevent movement of said shearing blade during
block. Upon return movement of the ram back to the
position of FIGURE 1, the lever 50 is permitted to swing 25 the terminal portion of the stroke of said ram whereby,
said movable crimping die moves past said shearing
at a counterclockwise direction to feed the strip and posi
blade and the leading terminal of said strip is sheared
tion the next adjacent terminal in crimping position.
from the carrier strip thereof.
While I have disclosed a preferred embodiment of the
invention, obvious modi?cations thereof, which fall with
References Cited in the ?le of this patent
in the proper scope of the appended claims, will be ap 30
UNITED STATES PATENTS
parent to those skilled in the art. It is contemplated,
for example, that the principles of the invention including
2,592,276
Hackbarth __________ __ Apr. ‘18, 1952
the reciprocable support for the feed mechanism, be
2,727,236
Klumpp ____________ __ Dec. 20, 1955
adapted to applicators for end-to-end type of strip termi
2,845,108
Hammell et al. ______ __ July 29, 1958
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