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Патент USA US3028786

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Aprll 10, 1962
Filed June 4, 1959
03 01 N
United States PatentO M»Ice
Patented APY- 10’ 19-62
rated ring member designed to inter?t between the ser
rated surfaces of the portions of the apparatus shown in
FIGS. 5 and 6 whereby to effect a ?ne angular adjustment
Herman Keller, Sidney, and Clifford R. Waldron, Una
dilla, N.Y.,,assignors to The Bendix Corporation, a 5 between such parts;
FIG. 8 is a view in side elevation of one embodiment
corporation of Delaware
of connector contact and wire leading thereto, which may
Filed June 4, 1959, Ser. No. 818,068
be assembled by one embodiment of the indenting tool
2 Claims. (Cl. 81-15)
of the present invention; and
This invention relates to a tool for indenting a ferrule;
FIG. 9 is a view in elevation of a second embodiment
such tool is useful, for example, in the fastening of a 10 of contact and lead wire assembly which may be made
cable or wire to a lug or contact.
by a further embodiment of the indentor tool of the pres
The invention has among its objects, the provision of
ent invention.
a novel improved indenting tool of the type described,
The indentor tool of the invention in the embodiment
which is characterized by the accuracy and uniformity of
thereof shown herein is particularly adapted for assem
15 bling connector contacts, such as those shown in FIGS.
the indented products produced thereby.
A further object of the invention lies in the provision
8 and 9, upon their lead wires. Such connectors are
of an improved indenting tool having an indentor advanc
adapted for use in separable electric connectors of the
ing cam means pivotally mounted with respect to the in
type disclosed and claimed in application Serial No.
dentor mounting and guiding means.
808,611, ?led April 24, 1959, by George I. Swanson. In
Still a further object of the invention lies in the pro 20 such contact assembly,‘ the- clenching or indenting‘of a
vision, in a tool of the type indicated immediately above,
ferrule on the contact upon the lead-wire extending there
of means for adjusting the inner terminal position of the
i-nto is relied upon for both the ‘sole mechanical and ‘sole
indentors corresponding to the ?nal, inner angular posi
electrical connection between the wire and the contact
tion of the indentor advancing and indentor guiding means
ferrule. In order'that-such connections shall have'the
25 desired mechanical strength and electrical conductivity,
relative to each other.
‘ .
Yet another object of the invention lies in the provision
both‘ initially and after long periods of arduous service,
of an indenting tool of such character, that after the in
the connecting ferrule of the contact must be held ‘to
dentors have once been advanced forcibly to contact a
close tolerances in machining, and the clenching or indent
workpiece such as a ferrule, the indentors can not there
ing operation must closelycontrolledj Thus, if the de
after be retracted to release the workpiece before they 30 gree of indention of the ferrule upon the wire should be
have completed the full path of their operative stroke.
inadequate, the resulting joint will not only lack the de
The above and further objects and novel features of
sired mechanical strength, but it will leave a somewhat
the invention will more fully appear from the following
open structure within the indented ferrule, assuming the
description when the same is read in connection with the
wire is of the multi-strand type, in which the strands are
accompanying drawings. It is to be expressly understood, 35 only loosely packed, thereby allowing the. markedingress
however, that the drawings are for the purpose of illus
of air into the joint. If, however, the degree of clenching
tration only, and are not intended as a de?nition of the
limits ofthe invention.
or indention of the ferrule wall is too great, either on
one or all sides thereof, the side wall of the ferrule will
In the drawings, wherein like reference characters refer
to like parts throughout the several views,
be locally drawn, reducedin gauge, and therebyv weak
ened or in some cases evenzpunctured.
FIG. 1 is a view in side elevation of a preferred em
It will be seen,
therefore, that the ferrule indenting operation must be
bodiment of indenting tool in accordance with the inven
tion, the indentors of the tool being shown in their fully
advanced, inner position with the operating arms of the
carried out with care, and with precision apparatus, if
such manner of connection of electrical ?ttings and lead
tool advanced into their inner, most nearly adjacent posi 45
wires thereto is to be satisfactory.
The embodiment of indenting tool shown herein has
proved to be particularly satisfactory for use by work-'
FIG. 2 is a fragmentary view in vertical section gen
men engaged in installing in situ electrical connectors in
cables. It will be understood, however, that in some in
erally through the axis of the head of the indenting tool,
the section being taken generally along the line 2-2 of
stances it may be desired to mount the headof an indent
FIG. 1, FIG. 2 showing a pin contact of a separable elec 50 ing tool made in accordance with the invention on a ?xed
trical connector within the tool and in the condition in
support, and to rotate the mainparts of the head relative
which the ferrule of such contact has been fully clenched
to each other as by power means rather than by handles
upon a lead vw're connected thereto;
FIG. 3 is a fragmentary view in vertical section through
The head of the clenching or indenting tool of'thc in~
the tool head shown in FIG. 2, the section being taken 55 vention in theembodiment shown is generally designated
generally along the line 3--3 of FIG. 2, certain of the
by the reference character 10. In describing the tool and
parts being shown in elevation, the indentors being shown
the parts which form it, the horizontal direction tojthe
in their inner, fully advanced position;
' right in FIG. 2 will be termed the forward direction, and
FIG. 4 is a fragmentary view in vertical section similar
the horizontal direction to the left in FIG. 2 will be
to FIG. 3 but with the indentors, and the indentor mov 60 termed the rearward direction. Head 10 is made upof
ing arms, occupying their outer, fully opened positions,
two main parts, an outer cam housing 11, and an inner,
the figure also showing, in phantom lines, an intermediate
indentor mounting and guiding element 12. Housing 11;
position of the parts wherein the indentors and the in-_
has a central generally circular cylindrical cavity 14 there
dentor-operating arms are prevented from outward move
within, within which is journalled the main barrel portion
65 of indentor mounting element 12; The camhousing 11
FIG. 5 is a view in vertical section through the indentor
has a ?at forward wall 15 through which there extends a
mounting element of the head of the tool, the section
central, contact-receiving opening 16. Indentor mount;
being taken along the line 5-—5 of FIG. 2;
' ing element 12 has an annular ?ange 17 ?tting within a}
FIG. 6 is a view in vertical section through the tool
similarly shaped seat in the wall of cam housing 11. A
showing the upper end of an indentor-operating arm, the 70 split spring ring 19, snapped into the seat at the rear of
section being taken along the line 6-6 of FIG. 2;
FIG. 7 is an enlarged view in end elevation of the ser
?ange 1_7,-retains element 12 within the cavity in cam
As shown more particularly in FIGS. 3 and 4, element
tools 21.
It will be obvious that contacts of different
12 has four equally angularly spaced radially directed
effective lengths may be operated upon by the tool by the
guideways 20, lying at the forward end of element 12
substitution of another locator member 46 having a bore
adjacent wall 15 thereof. Radially reciprocable in guide
47 therein of the diiferent required length.
The position of nearest approach of handles 30 and 34
ways 20 are four clenching or indenting tools 21, each
indentor 21 being very accurately guided in its respec
tive guideway.
The outer ends of tools 21 are partially
of the tool relative to each other is determined by the
adjusted position of a stop stud 55, which is threaded
into a bore 56 in handle portion 29, as more clearly shown
circular cylindrical, as shown at 22, ends 22 having slid
in FIG. 1. Preferably, as in the construction shown, the
ing engagement with the respective ones of the four cam
surfaces 24 on the inner periphery of cam housing 11. 10 slotted outer end of stud 55, by which it is adjusted, lies
hidden beneath the upper part of handle extension 30,
Between the radially innermost end of each of cam sur
thereby to prevent tampering with the adjustment of the
faces 24 and the radially outermost end of the next adja
cent cam surface, there is located a part circular cylin
The embodiment of tool shown is provided with a
drical pocket 25 which accurately receives the outer end
22 of its respective indenting tool 21 when such tools are 15 means whereby, once the indentors have been advanced
into ?rm engagement with a ferrule, the tool can not be
retracted into inoperative position, as shown in solid lines
again opened until the indentors have completed their
in FIG. 4. Indenting tools 21 are constantly urged out
operative stroke. In the illustrative embodiment, such
wardly into engagement with the cams 24 and/or the
means takes the form of a pawl 57, which is pivotally
pockets 25 by a split spring ring 26, which ?ts within slots
27 in the forward faces of the indentors as shown in FIGS. 20 mounted upon arm 32 by means of a pivot pin 59. Pawl
'57 is constantly urged into the position shown in full
3 and 4. The spring ring 26 is of such relaxed con?gura
lines in FIG. 3 and in phantom lines in FIG. 4 by means
tion that it constantly tends forcibly to expand radially
of a coil tension spring 60 having the bottom end thereof
outwardly of the position shown in FIG. 4.
attached to arm 32 at 61 and the upper end thereof at
The cam housing 11 of the head of the tool has an
extension 29 integral therewith, there being a handle ex 26 tached to the lower end of pawl 57 at 61. In such posi
tion the upper, pointed operative end 64 of pawl lies in
tension 30, conveniently formed of bent sheet metal, at
the central longitudinal plane of arm 32.
tached thereto by bolts 31. Adjustably secured to inden_
The end 64 of the pawl selectively cooperates with
tor-mounting element 12 is a second, handle-forming arm,
three downwardly extending serrations 65, 66, and 67,
composed of an upper, centrally apertured portion 32
having an extension handle 34 connected thereto as bolts 30 the point 64 of the pawl, when the tool is open as shown
in FIG. 4, lying to the left of serration 65, and, when the
35. The upper apertured end portion 32 of the second
tool is fully closed, lying to the right of serration 67.
handle is snugly but rotatably received over a central
When arm 32 is swung to the right from its full line posi
hollow trunnion-like member 36 which projects rear
tion shown in FIG. 4, the upper end 64 of pawl 57 snaps
wardly from element 12. Portion 32 is adjustable angu
larly with respect to member 36, and thus with respect 35 into the valley between serrations 65 and 66 or if such
motion is continued, into the valley between serrations 66
to element 12, by the following mechanism. The rear
and 67. In either of such two latter positions, the pawl
face of element 12 is serrated as shown more clearly in
57 is swung counterclockwise, as shown in phantom lines
FIGS. 5 and 7. Such serrations, which are designated
in FIG. 4, so that the pawl 57 now effectively prevents
37, are equally angularly spaced about the axis of ele
ment 12; conveniently there may be 24 serrations 37. 40 or blocks retrograde movement of arm 32. It is only
when the arms 30 and 34 have been swung together sul?
Fitting accurately over member 36 and rotatable thereon
ciently to cause point 64 of the pawl to clear serration
is a serrated adjusting ring 39 having serrations 41, on
67, as shown in FIG. 3, that the arms 30 and 34 again
its forward surface, which mesh accurately with serra~
become free to be moved apart.
tions 37, that is, there are 24 equally spaced serrations
The arms of the tool are constantly urged apart into
on the forward face of ring 39. The rear face of ring 45
tool-open position by the spring 69 acting therebetween,
39 has a plurality of equally angularly spaced serrations
as shown in FIG. 1. The arms of the tool must be fully
40 thereon, such serrations differing slightly in number
open to accept the largest diameter of the ferrule or other
from serrations 37 and 40. Conveniently there may be
part being crimped. Undue separation of the arms, should
23 serrations 40 on ring 39. The forward face of ele
ment 32 is provided with a plurality of serrations 42 of 50 the arms be allowed to spring apart under the action of
spring 69, is prevented by a cross-pin 70 engaging bent
the same shape, serrations 42 being equal in number and
tang portion 71 on the lower end of spring 69.
complementary in shape to serrations 41. After ad
In FIGS. 8 and 9 there are shown alternative connec
justment of the parts, in the manner to be described, ele
tors which may be operated upon by the embodiment of
ments 32, 39, and 12 are maintained tightly together with
their serrated surfaces in mesh by means of a nut 44 55 the tool shown. In FIG. 8 the contact is that shown at
52 in FIG. 2, such contact having one ferrule 72 engaging
threadedly engaged with the threaded outer end of ele
the end of the lead wire 73. Thus the inner, operative
ment 36, and by a spring washer 45 interposed between
ends 54 of the indentors 21 need have indenting surfaces
nut 44 of the rear surface of element 32. In the em
lying generally in one head transverse to the axis of head
bodiment disclosed, spring washer 45 is laminated and in
10. In FIG. 9, on the other hand, the contact 74 has two
relaxed condition is bent or dished somewhat along one
ferrules, one, shown at 75 engaging the forward end of
wire 76, and the second, shown at 77 being larger and
The tool head 10 has a connector-locating means in
clenched upon the end of the insulation 79 on the wire 76.
the form of a stud 46 having the forward end thereof
In forming the assembly shown in FIG. 9, the embodi
provided with a forwardly open axial bore 47. Stud 46
accurately ?ts within the central axial bore 49 in member 65 ment of tool shown will have its indentors provided with
two clenching zones, the rear zone clenching ferrule 75
36, and is held accurately by means of a ?ange 50 on
upon the wire 76, and the forward zone clenching ferrule
member 46, and a nut 51. As shown, ?ange 50 engages
77 upon the insulation 79.
the end of member 36; the nut 51 has an annular rear
The described construction of the tool, including the ad
?ange thereon overlying ?ange 50 and thrusting member
46 forwardly. The axial length of bore 47 in member 46’ 70 justable stop 55 and the adjusting means including ser
rated ring 39 acting between arm 32 and element 12, per
is such that when a contact such as that shown at 52 in
mit the tool to be accurately adjusted, when necessary,
FIG. 2 is placed with its operative end in engagement with
to compensate for the wearing of the elements of the
the inner end of bore 47, the ferrule on the contact is po
indenting tool, including the outer end surfaces 22 on
sitioned in the proper transverse plane axially of the head
of the tool to be operated upon by the inner ends 54 of 75 the indentors 21 and cam surfaces 24 on cam housing
11. Preferably when the tool is thus adjusted, it is also
disassembled, cleaned and lubricated. Assuming that this
has been done, the tool is reassembled and adjusted as
The indentcrs 21 and the spring 26 are assembled in '
guide element 12, and such assembly is installed in cam
sembled and ready for use. The tool may be readjusted,
when necessary, to compensate for wear on the indcntors,
cam ring, etc., whereby to restore the tool to its initial ac
curately adjusted condition.
Although only one embodiment of the invention has
been illustrated in the accompanying drawings and only
housing 11, being retained therein by snapping the split
two embodiments thereof have been described in the fore
. Spring ring 19 into the cavity rearwardly of element 12.
The pawl 57 and spring 6% are then mounted upon arm
going speci?cation, it is to be especially understood that
various changes, such as in the relative dimensions of the
32. Adjusting ring 39 is then telescoped over element 10 parts, materials used, and the like, as well as the sug
35, ring 39 being placed so that its teeth 41 mesh with
gested manner of use of the apparatus of the invention,
teeth 37 on the rear face of element l2. Arm 32 is now
may be made therein without departing from the spirit
telescoped over element 36, and is positioned so that it
and scope of the invention as will now be apparent to
forms an angle of about 28 °v with handle portion 29. With
those sltilled in the art.
W rat is claimed is:
l. A tool for crimping a ferrule upon a wire, compris
ing a tool head carrying a plurality of ferrule-indenting
arms 2? and 32 held in such position relative to each
other, the curved spring washer 45 is installed over
element 36 and is held in place by the nut 44, which is
tightened ?nger-tight at this time. The ‘adjustable stud
tools for movement inwardly toward and outwardly away
55 is now installed, and is screwed inwardly so that its
from each other, a cam means rotatable with respect to
inner end lies spaced a distance of .062 to .004 inch from 20 the tool head for advancing the tools inwardly in a work
arm 32 when the point 66% of pawl 57 just barely snaps
ing stroke, means for drivingly rotating one of the cam
past the last tooth or serration 67 on the body of cam
means and the tool head with respect to the other, and
housing 12.
means for adjusting the angular relationship between the
driven element and the driving means therefor, said last
that the arm 32 can not be closed enough for the pawl 25
means comprising a ring member interposed be
57 to snap past the last tooth 57. Then, holding thev
tween the driven element and the driving means, opposite
tool closed, the operator slowly backs out the stud 55
sides of the ring member carrying a plurality of uniformly
until the pawl 57 snaps clear of tooth 67. The adjust
spaced teeth, the teeth on the two sides of the ring mem
ment is checked by inserting a .904 inch feeler gauge be
her being different in number, teeth on the driven ele
This can best be done by ?rst adjusting stud 55 so
tween the screw 55 and arm 32 and then closing the tool. 30 ment and the driving means meshing with the teeth on
The pawl should not snap clear of tooth 67. The same
the respective sides of the ring member, and means for
operation is repeated using a .002 inch feeler gauge. ‘The
holding the driving element, the ring member, and the
pawl should now snap clear of tooth 67. The tool
driven element together in driving relationship.
should then be opened and closed several times and
2. A pliers-type tool for crimping a ferrule upon a
35 wire, comprising a circular tool head carrying a plurality
rechecked to make sure that its action is consistent.
After a justment of the set screw 55 is completed, a
of generally oppositely disposed ferrule-indenting tools
piece of masking tape is attached over the pawl 57 to
prevent it from contacting the teeth 65, 66, and 67 on
for movement inwardly toward and outwardly away from
each other, a barrel means disposed about the periphery
arm 32 while the indentors are adjusted. The indentor
of the tool head and carrying cam ramps cooperating
setting is now checked, and the distance between the 40 with the outer ends of the tools, the barrel means being
inner ends of the indentors is measured with the tool
rotatable with respect to the tool head about the axis
closed. it such dimension is greater than the‘ desired
thereof for advancing the tools inwardly in a working
setting, nut 44 is loosened and the adjusting ring 39 is
stroke, levers constituting handles connected to the tool
turned one click relative to arm 32 and element 12.
head and the barrel means, stop means acting between
While holding ring‘??? in its new position, nut 44 is re
the levers for determining the terminal positions of the
tightened, after which the distance between the inner ends
levers when thetools are in their innermost position,
of the indentors 2:1 is checked with the tool closed. vIt ' and means for adjusting the angular relationship between
will be understood that such turning of adjusting ring 39
one of the elements consisting of the barrel means and
one click relative to arm 32 and element 12 will have
the tool head and its respective lever, said last-named
adjusted the terminal position of element 12 relative to
means comprising a ring member interposed between the i
cam housing 11 through an angle approximately equal to
lever and the element to which the said, lever is
39 minutes, that is, the difference between 17/24 of 360°
opposite sides of the ring niember'carrying
and 17/23 of 360°.
a plurality of uniformly spaced teeth, the teeth on the
Cam surfaces 24 are so designed that when arms 39
55 two sides of the ring member being different in number,
and 3d are moved one tooth in either direction of the
teeth on the said element and the lever meshing with the
adjusting ring the effective result is a movement of the
teeth on the respective sides of the ring member, and
indentors equal to .0026 inch. If, however, the distance
means for holding the lever, the ring member, and the
between the inner ends of the indentors, with the tool
said element together in driving relationship.
closed, is less than the desired dimension, nut 44- is loos
ened and the arms 3% and 34 of the tool are closed and
' en opened one tooth each way on the adjusting ring
39 for each .0026 inch the distance between the inner
ends of indentors is below the desired setting.
When the desired setting is obtained, nut 44 is tight 65
ened to a predetermined degree as by using a torque
wrench thereon. The masking tape is now removed
from pawl 57, and the assembly of the tool head 10 is
completed by installing the contact locator 46 and the
nut 51. Handles 3t) and 34 are now attached to arms
29 and 32 of the tool; the tool is now completely as
References Cited in the ?le of this patent
Low ________________ __ Apr. 13, 1909
Beacham s ___________ __ Apr. ‘16, 1918
Brenizer ______________ _._ July 6, 1937
Bergan __-'_ __________ __ Dec. 14, 1954
Buchanan __________ __ July 10, 1956
American Machinist, pages l68—9, Jan. 22, 1931.
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