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Патент USA US3096814

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July 9, 1963
3,096,804
w. J. FUERTH
APPARATUS FOR MAKING ELECTRICAL CONNECTIONS
Filed Dec. 19, 1960
3 Sheets—Sheet 1
ON
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mm
WILLIAM
BY
Mir/u
INVENTOR.
J.
FUERTH
,W QLQM
ATTORNEYS
July 9, 1963
3,096,804
w. J. FUERTH
APPARATUS FOR MAKING ELECTRICAL CONNECTIONS
Filed Dec. 19, 1960
5 Sheets-Sheet 2
-
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_
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m
no
NINVENTOR.
9
WILLIAM
J. FUERTH
BY
@m/W?W 4 W
ATTORNEYS
July 9, 1963
3,096,804
w. J. FUERTH
APPARATUS FOR MAKING ELECTRICAL CONNECTIONS
Filed Dec. 19. 1960
3 Sheets-Sheet 3
INVENTOR.
WILLIAM
J.
FUERTH.
BY
0(MiE/vIW,Q¢4M~W
ATTORNEYS
United States Patent 0 "ice
Patented July 9, 1963
2
1
gaging with successive connectors during one portion of
each feed cycle and automatically disengaging therefrom
during the remaining portion of each feed cycle.
3,096,804
APPARATUS FOR MAKING ELECTRICAL
CONNECTIONS
William J. Fuerth, Warwick, R.I., assignor to Patton-Mac
Guyer Co., Providence, R.I., a corporation of Rhode
Another object of the invention is to provide a manual
ly operated crimping tool for attaching electrical connec
tors to wires in such a manner that insulation piercing
Island
ears integrally formed with the body of the ferrule are
forced through the insulation into electrical contact with
the surface of the underlying wire.
Another object of the invention is to provide a man
Filed Dec. 19, 1960, Ser. No. 76,853
4 Claims. (Cl. 153-1)
This invention relates generally to electrical contact
making apparatus and particularly to improved apparatus
ually operated crimping tool for attaching electrical con
for attaching electrical connectors to wire.
nectors to wires, the crimping tool also having means for
feeding connectors sequentially into position for crimping
to separate wires.
“solderless” connections may be made by crimping elec
Another object of the invention is to provide a man
trical connectors to wire. Many types of crimping tools 15
ually operated crimping tool for attaching electrical con
for such a purpose have been developed. Generally, all
It has been known for some years that so-called
such tools provide means for deforming the ferrule of an
nectors to wires which is useful in many diverse environ
electrical connector around a wire until a permanent set
is imparted to the ferrule. This deformation creates a
ments.
Still another object of the invention is to provide a
manually operated crimping tool for attaching electrical
permanent and intimate contact between the ferrule and
the wire. To accomplish the desired result, the ferrule
of a connector and a wire to be joined are placed between
connectors to wires in which means are provided for
adapting the tool to use with different types of connectors.
a pair of complementary dies of appropriate size and
Other objects and many of the attendant advantages of
this invention will be more readily appreciated as the in
shape and the dies are forced together until a desired de
gree of deformation of the ferrule and the wire results 25 vention becomes better understood by reference to the
following detailed description, when considered in con
to ensure a close electrical connection. In many cases,
nection with the accompanying drawings, wherein:
as when connections are made in a factory, it is easy and
FIG. 1 is a side elevation of a manually operated
practical to use power-driven crimping tools, by means
crimping tool embodying the present invention;
of which satisfactory connections may be consistently
FIG. 2 is an end elevation of the crimping tool shown
made. However, when connections are to be made in 30
in FIG. 1;
the ?eld, or when connections are to be made at a low
FIG. 3 is a longitudinal cross-section view taken by
rate in either a factory or a laboratory, it becomes im
passing the plane ‘3—3\ through FIG. 2;
practical to use poweradriven crimping tools. It is neces
FIG. 4 is a fragmentary view of the feeding mech
sary, therefore, that a manually operated crimping to'ol
be provided. Known manually operated crimping tools
are, in essence, modi?ed hand pliers having special jaws
shaped to be complementary dies. The wire and the
ferrule to be connected together are placed between the
dies and the pliers are operated manually so that the de
sired crimping is performed.
Several disadvantages and difficulties are experienced
when known manually operated crimping tools are used.
Perhaps the most important of these is that it is extreme
35
anism, partially in phantom, showing the relationship of
the parts in such mechanism during a second portion of
the feeding cycle; and,
FIGS. 5 and 6 are isometric views of examples of dif
ferent types of connectors which may be attached to wire
40 in the crimping tool shown in the drawings.
Referring now to the drawings, it may be seen that
the preferred embodiment of my invention comprises
generally an operating section 10 and a storage reel 12
ly difficult to control the amount of deformation of the 45 connected together by a connecting member 14. Storage
assembly 12 may consist of a spindle .16 supporting and
ferrule to ensure uniformly good electrical connections.
separating a pair of opposing ?anges 18 (only one of
In other words, it is extremely di?icult consistently to or which is shown) having a strip of connectors 20 spirally
tain the proper electrical connection between the wire
wound around the spindle 16 and restrained from un
and ferrule using known manually operated crimping
tools. Another disadvantage of known manual crimping 50 wanted sideways movement by the ?anges 18. It is noted
here that the shape of individual ones of the connectors
tools is that many types of connectors, as those which are
20 in the strip is not critical to the invention. That is,
provided to the user in a long severable strip, are not well
differently shaped connectors may, as, for example, the
adapted to such crimping tools. 'Further, dif?culty is
connectors shown in ‘FIGS. 5 and 6, be used. It is neces
often experienced when known manual crimping tools are
to be used in restricted quarters. Finally, known man 55 sary only that each connector have a ferrule section
(preferably a substantially U-shaped element) to provide
ually operated crimping tools are not easily adapted to
use with more than a single type of connector, in that
the dies are relatively dii?cult to change to accommodate
the tool to different types of connectors.
means for attaching a wire and a lug section (preferably
a pierced or a forked plate) to provide means for con~
manually operated crimping tool for attaching electrical
meeting the completed device in an electrical circuit. The
operating section 10 consists of a crimper and cut off as
sembly 22 mounted with a feeding assembly 24 on a com
connectors to wires in such a manner that insulation
mon base 26.
It is a primary object of the invention to provide a
The crimper and cut off assembly 22 consists of a pair
of cooperating dies 28, 30 and associated structure to
rule are forced through the insulation into electrical con
tact with the underlying wire. At the same time, a cut 65 actuate such dies as will now be described. One of the
dies 28 is affixed to the base 26 by any known means as
ting tool attached to the movable die separates the con
by mounting screws (not shown). A relief opening 32
nector being crimped from any other connectors in the
is formed vertically in die 28‘ as shown to accommodate
crimping tool, means being provided to hold the connec
a cut oif tool 34-, which element, in turn, is connected to
tors ?rmly in position during the cut off operation. A
strip of connectors is fed intermittently through the 70 the movable die 30 to- move in unison therewith. Any
convenient way of fastening the cut off tool 34 to the
crimping tool by means of an independently actuated
die 30 may be used, as a pair of screws 36. I prefer
feed mechanism having a movable pin automatically en
piercing ears integrally formed with the body of the fer
3,096,804
to use screws 36 to connect the die 30 to an arm 38 in
order that the cut off tool ‘34 or die '30 may be easily
changed if desired. The upper end of arm 38 is con—
nected to a spring-retaining plate 40, as by dovetailing
the two elements together and welding the same. The
arm 38 is slidably mounted in a pair of opposing tracks
39 so that the upper die 30, the cut off tool 34, and the
spring retaining plate 40 may slide up and down as a
unit, integral with arm 38. Until such time, however, as
4
spring 78 is compressed, the pressure pad 82 is held ?rm
ly in position so that there is no chance of unwanted
movement of the strip of connectors during the time the
die ‘30 and the cut off tool 34 are in operation.
The feed mechanism 24 is shown in detail in the lower
portion of FIG. 3 ‘and also in FIG. 4. The feed mecha
nism consists basically of blocks 86‘, 88, and 90‘ mounted
on the base 26 and having appropriately shaped grooves
(not shown) therein to accommodate a strip of the elec
it is desired that the die 30 move downwardly, a pawl 46 10 trical connectors being processed. Blocks 88 and 90 fur
mounted on a shaft 48 is urged by a spring 50 into en
ther are recessed on their lower sides to accommodate a
gagement with the lower side of the spring retaining plate
rocker arm 92 which is pivoted in the cavity formed be
40. A driving spring 52 is disposed
a retaining
tween the lower sides of block 88 ‘and block 90 and the
wall 54, the lower end of the driving spring 52 resting
base 26 by a pin 94. Block 88 further has a spring
on the spring-retaining plate 40. The retaining wall 54
is complementary in shape to the shape of the driving
spring ‘52 which latter element may, in a preferred em—
bodiment be a helix. A pair of upper elongated openings
56 (only one of which is shown) is formed through the
retaining wall 54 so as to receive a compression pin 58.
A second pair of opposing elongated openings 5'] (only
retaining hole formed partially therethrough and opening
on its lower surface to accommodate a spring 96 to urge
the right-hand end of the rocker arm 92 downwardly, thus
making the upper left-hand surface thereof parallel to
the strip of connectors 20. A block 98, having a vertical
opening formed therethrough, is placed on top of rocker
arm 92 on the opposite side of the pivot pin 94 from
spring 96. A beveled pin 100 is placed in the vertical
opening in block 98. A transverse opening is also formed
one of which is shown) is formed in the retaining wall
54. A stub pin 62 is ?tted into each of the openings 57.
Two links 64 (one of which is shown in dotted outline
in block 98 to accommodate a connecting pin 102. Con‘
FIG. 3) are pivotally mounted between separate ends of 25 necting pin 102 projects outwardly from block 98 through
compression pin 58 and each one of the stub pins 62. An
a slot 104. The outer end of connecting pin 102, in turn,
operating lever 66 (which preferably is bifurcated) is
is connected through link 106 to a connector advancing
also pivotally connected to each of the stub pins 62.
arm 108.
Also pivotally connected to stub pin 62 is an operating
When the ‘connector advancing arm ‘108 is down, or in
arm 68. The upper end of a connecting link 70 is piv
the position shown in FIG. 1, then the link 106 operating
otally mounted to a shaft '72 attached to operating arm
through the connecting pin 102 forces block 98 and bev
68 and the lower end of the connecting link 70 is formed
eled pin 100 closer to the pivot pin 94 of the rocker arm
to receive a shaft 74. A roller 76 is mounted on shaft
92. In this condition, the moment of the force tending
74. The roller 76, in turn, ?ts in channels (not shown)
to
rotate the rocker ‘arm 92 clockwise (which moment is
‘formed in the operating lever 66 so that the connecting
a product of the distance of spring 96 from the pivot pin
link 70 may move longitudinally with respect to operat
94 and the strength of the spring 96) exceeds the moment
ing lever 66 and at the same time always be engaged
of
the force tending to rotate the rocker arm 92 in a
therewith. A leaf spring 78 is disposed to bear against
counterclockwise direction. The moment tending to
the underside of the operating lever 66. Thus, when the
rotate the rocker arm 92 in a counterclockwise direction
operating arm 68 is depressed, connecting link 70 forces
is a product of the force of [the leaf spring 78 effectively
the operating lever downwardly against leaf spring 78.
acting through the strip of connectors and ‘the block 98.
At the same time, roller 76 moves longitudinally of op
As the connector advancing arm 108 is moved in a
erating lever 66 and the stub pins 62 are moved down
counterclockwise direction», block 98 is forced to the left
wardly. This movement of stub pins 62 in turn causes
as shown in FIG. 4, increasing ‘the moment tending to
the compression pin 58 to move downwardly to compress
driving spring 52 against the spring retaining plate 40.
As the ‘operating arm 68 moves downwardly, roller 76
rotate the rocker arm 92 in a counterclockwise vdirection.
Finally, the moment tending to rotate the rocker arm 92
in a counterclockwise direction exceeds the moment tend
ing to rotate that arm in a clockwise direction, so that
rocker ‘arm 92 assumes the position shown in FIG. 4.
contacts pawl 46, causing pawl 46 to rotate around its
shaft 48 and to disengage pawl 46 from spring retaining
plate 40. The operating spring 52, being under com 50
Since the block 98' ‘and the beveled pin 100 merely rest
pression, forces the spring-retaining plate 40 and the ele
on the upper surface of the rocker arm 92, block 98, and
ments connected thereto downwardly. During the down
beveled pin 100 move ‘downwardly. It is noted, however,
ward movement, the cut off arm 34 operates to cut off
that during the time the block 98 and the beveled pin 100
the last electrical connector in a strip of connectors, and
simultaneously the upper die 30 crimps the ferrule of 55 are moving to the left, the beveled pin 100 is engaged in
an opening in the strip of electrical conductors 'so the
such severed connector around a wire to produce either
strip ‘is carried along with the beveled pin 100. After the
of the typical connections shown in FIGS. 5 and 6. Since
rocker arm 92 is rotated in a counterclockwise direction
‘the details of operation of my preferred feed mechanism
and the block 98 and pin 100 have moved downwardly,
24 will be described in detail hereinafter, it is su?icient
here that it be understood that a wire and a connector 60 the pin 100 is at least partially disengaged from the open
ing in [the strip of connectors. Thus, as the connector
are placed between the dies 28, 30 before the pawl 46
advancing arm 108 is moved back to its original position,
is released. That is, the last connector of the strip of
beveled pin 100 is carried along with block 98 back
connectors 20 is ‘brought into position on the lower die
toward the pivot pin 94, the bevel ensuring complete
28 so that its ferrule 31 opens upwardly. An end of a
disengagement of the beveled pin 100' during this return
wire 37 is placed in the ferrule 31 so that when the upper
movement and leaving the strip of electrical connectors
die 30 is forced downwardly the tapered sides thereof
contact the ferrule 31 and ears 3-3 projecting therefrom
to shape those elements as desired. After the operating
in (the position to which it had been moved. At the same
time during the movement of the block 98 and beveled
arm 68 is released, leaf spring 78 forces the operating
pin 100 toward the pivot 94, the moment on the rocker
lever 66 upwardly, thereby returning all of the just de 70 arm 92 causing counterclockwise rotation thereof de
scribed elements to their [original position preparatory to
feeding a second connector into position to be crimped.
It is noted here that the lower end of leaf spring 78
is ?tted on the upper surface of a pressure pad 82, which
creases su?iciently that the rocker arm 92 moves back
to its original position. Now, since the lateral ‘move
ment of the block 98 and the pin 1100 may be limited by
proper adjustment of link 106 and the connector advanc
element, in turn, is pivoted on, a pin 84. Thus, when leaf 75 ing arm 108, then the reciprocal motion of the beveled
3,096,804
5
6
ferrule consisting of 1a body portion and opposing ears
formed integrally therewith and an electrical conductor
pin 100 may be made to be the same as the distance be
tween successive openings in the strip of electrical con
nectors. Thus, after moving the connectors a ?xed dis
tance to the left, the beveled pin 100‘ moves back into
position so that it can pick up the next opening in the
having a resilient insulating covering thereon, compris
ing, a crimping die having a ?xed anvil and a movable
section, feeding means for placing and holding the
rounded portion of the body portion of said electrical con
nector in said ?xed anvil to receive an end of said electri
cal conductor, means springily operated to move said
strip.
A pressure pad release is also provided whereby the
pressure pad 82 may be moved upwardly while connec
movable section into contact with the sides of said body
tors are being threaded into the crimping tool. The pres
sure pad release consists of an operating knob 110‘ sup 10 portion and said opposing ears, whereby said body por
tion is crimped to said insulating covering and said ears
ported near the bottom of the crimping tool in the wall
are recurved therethrough into contact with the surface
thereof and connected to a shaft 111 (shown in dotted
of said electrical conductor, a portion of said resilient in
lines in FIG. 3 and FIG. 4). An eccentric pin 112 ?tting
sulating covering being compressed between one surface
loosely into an opening in pressure pad 82 is attached to
shaft 111. Thus, when the operating knob 110* is turned, 15 of each one of said ears and a surface of said body por
tion of said ferrule whereby ‘an intimate contact is main
tained between said electrical conductor and each one of
said ears; said electrical connector being the last one of a
strip of similar connectors and said feeding means in
cludes a spring-loaded rocker arm having one surface
the pressure pad 82 is caused to rotate against the leaf
spring 78 around pivot point 84, thereby making it pos
sible to raise the end of the pressure pad 82 which nor
mally engages the electrical connectors being processed
so that a strip of such connectors may be easily fed into
thereof initially parallel to said strip, a pin slidably
the tool.
It will be noted that the dies 28, 30‘ may be easily
mounted on said one vsurface and initially engaging said
strip, a pressure pad springily urging said strip toward
changed as desired to crimp electrical connectors diifer
said rocker arm and means for moving said pin along
ing from the type illustrated merely by removing the
mounting screws 36 and replacing the dies being used 25 said one Surface to move said strip whereby said electri
cal connector to be crimped is placed in said ?xed anvil
with other dies. Further, the device may be easily modi
and said rocker arm is caused to rotate to disengage said
?ed to compensate for connectors having differently
pin from said strip.
spaced openings therein merely by adjusting the length
3. Apparatus as in claim 2 having, in addition, a cut
of either the link 106 or the distance between the pivot
off tool affixed to said- movable section of said- crimping
point of the operating arm 108 and the point of connec 30 die whereby said electrical connector to be crimped is
tion of link 106 to such operating arm.
separated from said strip during the time said movable
Obviously, many modi?cations ‘and variations of this
section is in contact with said electrical connector to be
invention other than those noted above are possible in
crimped, and means for increasing the pressure on said
the light of the above teachings. It is to be understood,
strip through said pressure pad to hold said strip in posi
therefore, that the invention is not limited in its appli
tion relative to said out off tool during the time said cut
cation to the details of construction and the arrangement
oif tool is in contact with said strip.
of parts speci?cally described or illustrated, and that with
4. Apparatus for uniformly making a crimped connec
in the scope of the appended claims, it may be practiced
tion between a wire and the end one of a strip of electrical
otherwise than as speci?cally described or illustrated.
I claim:
40 connectors; each one of said connectors including a ferrule
1. In apparatus for uniformly making a crimped con
nection between a wire and the end one of similar elec
trical connectors in a strip‘ thereof, each one of said elec
trical connectors including a ferrule section and a lug
section and a lug section; said apparatus comprising stor
age means for holding said strip; a spring-actuated mov
able crimping die and a stationary lower die; a cut o?
tool affixed to said movable die; feeding means adapted
to shift said strip and position a ferrule of said end one
section, an intermittent feeding and holding assembly for 45 of said electrical connectors beneath said crimping die;
said strip, comprising: a base adapted to receive a portion
said feeding means intermittently cooperating with suc
of said strip; a rocker arm pivotally mounted on said base
cessive lug sections of the electrical connectors; means
below said portion of said strip and having a surface par
simultaneously actuating said feeding means, said spring
allel to said portion; a restraining spring disposed between
actuated die and said out off tool whereby said ferrule is
said base and said rocker arm to exert a ?xed moment of 50 crimped to said wire and severed from the supply strip;
force on said rocker arm; a block slidably mounted be
tween said portion of said strip and said surface, a trans
verse and a vertical opening being formed in said block;
a connecting link disposed in said transverse opening and
said feeding means including a rocker arm adjacent one
side of said strip; said rocker am having an initial and a
second position; a surface of said rocker arm being par
allel to said strip when said rocker arm is in said initial
projecting outwardly therefrom; a pin slidably mounted 55 position; means, including a ?rst spring urging said rocker
in said vertical opening and projecting upwardly there
arm into its said initial position; a pin slidably mounted
from, the lower end of said pin resting on said surface
and the upper end engaging a lug section of one of said
on said one surface and engaging a lug section of one said
electrical connectors in said strip; a pressure pad contact
electrical connectors; a pressure pad pivotally mounted
ing the second side of said strip‘; a block slidably mounted
on said base and bearing on the upper surface of said 60 on said one surface and contacting said one surface of
portion of said strip; a pressure pad spring bearing on
said pressure pad whereby the moment of force of said
restraining spring initially is balanced by a moment of
said strip; means, including a second spring urging said
pressure pad into contact with said strip, whereby a force
urging said rocker arm into its said second position is
force acting through said pressure pad, said portion of
vapplied through said pressure plate, said strip and said
said strip and said block; means attached to the outer end 65 block; and, means simultaneously moving said block and
of said connecting link to move said block along said sur
said pin along said one surface whereby said strip is
moved and said rocker arm is rotated into its said second
face to move said portion of said strip and simultaneously
position to disengage said pin.
to increase the moment of said force from said pressure
pad to cause said rocker arm to rotate to disengage said
References Cited in the ?le of this patent
pin from said lug section; and means to increase the force 70
UNITED STATES PATENTS
of said pressure pad spring to hold said portion of said
electrical connectors in place during the crimping opera
tion.
2. Apparatus for uniformly making a 'crimped connec
tion between an electrical connector having a U-shaped 75
917,739
2,832,410
2,842,018
2,850,093
Owens _______________ __ Apr. 6, 1909
Soss _________________ .._ Apr. 29, 1958
Hammell et al. ________ __ July 8, 1958
D’Angelio et
_________ __ Sept. 2, 1958
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