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Патент USA US3070153

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Dec. 25, 1962
Filed Oct. 13, 1959
3 Sheets-Sheet 1
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Dec- 25, 1952
File'd Oct. 15, 1959
s Sheets-Sheet 2
Dec. 25, 1962
Filed Oct. 15. 1959
3 Sheets-Sheet 5
Patented Dec. 25, 1962
Martin L. Klingler, Hershey, Pa., assignor t0
AMP Incorporated, Harrisburg, Pa.
Filed Oct. 13, 1959, Ser. No. 846,099
ing of this relief valve, a second piston is moved into
engagement with the latch means and disengages it from
the free piston to permit return of this latter piston to
its initial position.
6 Claims. (Cl. 153-4)
The use of a crimping device in accordance with the
invention certi?es the ?nished crimp in two respects as
follows: Since the piston which opens the inlet valve
This invention relates to ?uid-operated tools for com
pressing or crimping electrical connectors onto wires or
is retained in the opened position by the spring-biased
performing similar operations.
latch, it is not essential that the exhaust valve, the open
10 ing of which initiates the crimping cycle, be kept open
In the crimping of electrical connectors onto the ends
of wires, it is important that the connector be crimped
or compressed to the requisite degree for best results. If
a connector is only partially crimped, or is not crimped
during the entire cycle. If the operator opens the ex
haust valve only for a brief instant, the free piston will
open the inlet valve and the free piston will thereafter
be kept in engagement with the inlet valve until the cycle
to the extent for which it was designed, the resulting con 15 is completed. Furthermore, the cycle can not be com
nection may appear to be satisfactory although in fact
pleted unless the relief valve is opened and this event
the connection might have latent defects which would
will occur only if the required pressure exists in the
give rise to inferior tensile strength or inferior electrical
motive ?uid. If the pressure does not exist, the crimp
conducting ability. Since it is impossible to determine
ing dies will be held in their partially closed position
from visual inspection whether or not a crimped connec 20 until the system is exhausted by a di?erent method. Of
tion has been properly made, it is desirable to employ
course, the mere fact that the tool does not completely
tooling which is substantially fool-proof and with which
cycle itself in indicative of some malfunction or possi
it is imposible, or at least extremely di?icult, to form any
bly of insufficient pressure in the motive fluid.
thing bnt a properly crimped connection.
In the drawing:
An object of the present invention is to provide a 25
FIGURE 1 is a sectional view of a crimping. tool and
?uid-operated crimping tool for electrical connectors or
?uid supply system which embodies the invention; and
the like which ensures proper and complete crimping of
FIGURES 2 and 3 are semi-diagrammatic views of the
the connector ferrule. A further object is to provide a
control valve system showing the positions of the parts
?uid-operated crimping tool having trigger means or the
at two different stages of the cycle.
‘like for initiating a crimping cycle, and having means to 30 The preferred embodiment comprises a hand tool gen
ensure complete cycling of the tool after the trigger has
erally indicated at 2 and including a C-shaped head por
been depressed, regardless of the length of time during
tion 4 having a ?xed die 6 and a movable die 8 which is
which the trigger is held in a ‘depressed condition. A
secured to the end of a piston rod 10. The piston 12 to
further object is to provide a ?uid-operated crimping tool
which piston rod 10 is secured is biased downwardly as
which will completely cycle during a crimping operation
viewed in the drawing by means of a spring 14 but is
only if the pressure of the ?uid is above some predeter
driven upwardly upon the admission of motive ?uid into
mined minimum level. A further object is to provide a
the cylinder 16 from a hose 24 through a coupling 22
?uid operated crimping tool having a valve means remote
which is threaded into the cylinder 16. A handle portion
from the tool for controlling its operation and including
18 attached to cylinder 16 provides a hand grip and a
a remote control on the tool for the valves.
These and other objects are achieved in a preferred em
bodiment comprising a single stroke ?uid motor for mov
trigger mechanism for initiating the crimping cycle as
vided for rapidly exhausting the pressurized ?uid from the
having communication with the open axial bore 30 of cyl
opposite or second face of the free piston to cause move
inder 28 by means of a passageway 50. It will be noted
described more fully below.
The opposite end of hose 24 is threaded by means of
ing a pair of crimping dies relatively towards each other,
a coupling 26 into the end of a cylinder 28 which con
a source of compressed ?uid for driving the ?uid motor,
stitutes the high pressure hydraulic side of a pressure
and a control valve system for regulating the supply 45 intensi?er. Normally hydraulic fluid such as oil will be
of pressurized ?uid. The control valve system comprises
contained within the bore 30 of the cylinder so that
a passageway extending from the source of pressurized
upon movement of a plunger 32 into the cylinder, the
fluid to the fluid motor system and having an inlet valve
tool piston 12 will be driven upwardly. The low pres
sure side of the intensi?er comprises a cylinder 34 hav
in the passageway which is normally maintained in the
ing a piston 36 therein which is normally biased against
closed condition by the pressure of the motive ?uid it
self. This inlet valve is opened by means of a slidable
the back wall 38 of a cylinder by means of a spring 40.
free piston having a ?rst face which is subjected to the
This spring bears against an annular diaphragm 44 which
pressure of the motive ?uid and a restricted passageway
is clamped at its inner and outer edges at 46, 48 between
extending from the one face to the opposite or second
cylinder 34 and the enlarged base 29 of cylinder 23.
face so that the opposite face is also subjected to the
This diaphragm and the recessed face 31 of base 29
pressure of the motive ?uid. An exhaust valve is pro
define reservoir 42 for the hydraulic ?uid, the reservoir
ment of the piston towards the inlet valve, the restricted
that this passageway is so located that it is uncovered
only when piston rod or plunger 32 is in its fully retracted
passageway through the piston being too small to per
mit instantaneous equalization of the pressure on the
position and that upon initial movement of piston rod 32
two sides of the piston. This piston is adapted to en
and piston 36 the port or passageway is covered. Thus,
gage and open the inlet valve to initiate a crimping cycle
the extremely high pressures which are generated in the
for the tool. Upon movement of the free piston, it is (i5 hydraulic side of the intensi?er are not transmitted to
engaged by a spring biased latch and locked against re
reservoir 42.
turn movement so that motive ?uid is supplied through
The control system for regulating the admission of
compressed air into cylinder 34 comprises a valve body
the inlet valve to the ?uid motor system until this latch
is disengaged. Such disengagement is achieved by means
54 secured to the external surface of back wall 38. This
of a relief valve which is so adjusted that it opens only
valve body provides an inlet port 56 which receives the
threaded end of a ?tting 58 on the end of a hose 60
when a predetermined minimum pressure is achieved in
which extends to a source of compressed air. A passage
the ?uid motor system of the crimping tool. Upon open
way ‘62 extends from this inlet into a chamber 64 which
Upon movement of free piston 86 downwardly, it is
constitutes one portion of a bore extending through the
locked in its downward position by means of an L-shaped
valve body and which is plugged at its open end as shown
latch having arms 128, 134 which is pivoted at 130 be
at as. An inlet valve 78 in chambered has an O-ring
tween a pair of upstanding ears extending from the valve
d8 which seats against a shoulder in the bore. Adjacent
body 54-. A spring 129 normally biases arm 128 down
this shoulder is a restricted diameter bore section '72
wardly ‘as viewed in FIGURE 2 so that the end of arm
134 is pressed against the surface of extension 98. Upon
which, in turn, opens into an intermediate chamber 74.
A stem '76 on valve 70 having a conical end 78 extends
downward movement of the free piston, the end of this
through bore section 72 into chamber 74. A passageway
arm moves over the shoulder 99 and the free piston is
88 leads from chamber 74 through the valve body 5% 10 latched against return movement. In this manner, inlet
and communicates with an opening in the back wall 38
valve 76 is held open until the latch is disengaged. Such
of cylinder 34 to permit admission of pressurized air into
disengagement is achieved by means of a plunger ‘144)
this cylinder. Valve 74} is normally maintained in the
having a bifurcated end 136 which is engageable with
closed condition (i.e. O-ring 68 is normally seated against
the end of latch arm L28. This plunger extends through
the shoulder) as shown in FIGURE 2 by virtue of the
an adjusting nut 138 and into a chamber in the valve
pressure of. the compressed air from the line on its under
body and has on its end a piston 144. A spring 145 nor
side 82..
ma‘lly biases this piston downwardly so that the conical
’ Chamber 74 opens into a somewhat larger chamber
end 146 on the face of this piston is normally seated
in the outlet port of a passage 149. Passage 149 com
84 in which is slidably mounted a valve spool or free
piston 86 having a central portion which is of substan 20 municates with a passage 148 which in turn communicates
with the interior of cylinder 34 through back wall 38.
tially the same diameter as chamber 84 and having a ?rst
side 88 which is exposed to the line pressure by means
Spring 1145 and nut 138 are so adjusted that valve 146
{of passageways 89, 91, the passageway 89 communicat
is opened when the pressure within the cylinder reaches
the desired level. Upon opening of this valve, piston 144
ing with inlet port 56; A reduced diameter extension 9%)
of the free piston extends axially and slidably into a bush
ing 92 in upper section of chamber 84, and a washer 94
and snap‘ ring 96 in this chamber prevent upward move
inent ofthie piston 86 beyond the position shown in the
FIGURE 2-. Extending from reduced diameter section
moves upwardly thereby swinging the latch in a coun
terclockwise direction around its pivot 136 and permitting
upward travel of piston 86.
Advantageously, a safety valve is provided which com
prises a piston and plunger 15%] spring-biased upwardly
is a projection 98 which is shouldered near its end to 30 in a chamber 151. If, for any reason, excessive pressures
It will be noted that the
are developed in the system and the valve 146 does not
form and end portion 100‘.
end portions 98, 100 of this free piston extend beyond
open, plunger 15-h would be urged downwardly by the
the valve body and that the shoulder 99 between the
portions 98 and 1050 is above the surface of the valve
excessive pressure in the system and uncover an exhaust
port 151.
03 Cl
To summarize, the operator places the uncrimped termi
nal and wire between the dies and squeezes the trigger.
body in FIGURE 2.
The opposite side 104 of piston 86 has a reduced diam
eter extension 102 which projects into chamber 74. A
Air is exhausted from the underside of free piston 86
restricted. passageway 106 extends through the central
causing downward movement thereof to open valve '70.
portion of the free piston 86 and between the faces there
At the same time the central exhaust bore in this free
of so that the pressure of the line acts against the lower 40 piston is closed by conical valve 78. Compressed air
iace 104 of this piston as well as the upper face 88. As
then ?ows through passageway 80 into cylinder 34 there
is apparent from the drawing the area of face 104 is
by to drive plunger 32 into bore 30‘ and move the dies
greater ‘than the area of face 88 and the free piston is,
relatively towards each other. During this portion of
therefore, biased upwardly when the pressure on the two
the cycle, the free piston is held in its downward position
‘sides is the same. A port 108 opening into chamber 84
as viewed in FIGURE 2 against the end 78 of valve 70
‘communicates with an outlet port 110 which receives a
by latch arm 134. Thus, even if the operator squeezes
threaded ?tting on the end of a hose 112 (FIGURE 1).
the trigger only instantaneously, the inlet valve is held
The opposite end of this hose has a ?tting 1141 which is
open. When the system reaches equilibrium, which is
threaded into the handle 18 of the tool itself. This tool
to say when the pressure is uniform throughout, the relief
handle has a passageway 116 which is enlarged at its 50 valve 146 is opened and plunger Mil moves upwardly thus
lower end 118 for the accommodation of a ball check
disengaging latch arm 134 from the free piston, which
valve 124). A rod 122 in this passageway has its upper
moves upwardly under the in?uence of the air pressure
end in engagement with a pivotally mounted trigger 126
on its face Hi4 and the face of projection 102. Valve
as shown at 124 so that upon clockwise movement of
the trigger, as viewed in the drawing, the rod 122 is
pushed downwardly to unseat the ball check valve 120
and exhaust air from the underside of piston 86 through
7%} also moves upwardly by virtue of the line pressure on
its face 82 and the inlet valve is thereby closed. Air is
exhausted from the main cylinder by means of the axial
bore TM in the free piston which is open to the atmosphere
a port 121 in the tool handle. The valve 12% thus con
after the free piston moves upwardly.
stitutes a bleeder valve for bleeding air from the under
The overall advantage which accrues from the instant
side of piston 86. When the underside of this piston is 60 invention is that incomplete or improper crimping of the
exhausted, the free piston is moved downwardly since
terminal is virtually impossible. If, for any reason the
the restricted passageway N6 is not suf?cientiy large to
air pressure of the compressed air source to which hose
equalize the pressure between the two faces of the piston.
68 extends should fall below the required level, the crimp
As the piston moves downwardly, the face of the reduced
can not be completed since relief valve 146 will not open
diameter portion 102 engages the cone-shaped end 78
unless this predetermined pressure exists in passageway
--of valve 7% and this cone-shaped end enters and closes
149 and, therefore, in cylinder 34. Thus, if the line
the axial exhaust bore lill in the piston itself. Substan
pressure should drop to a low level momentarily by reason
tially simultaneously, valve 78 is pushed downwardly as
of a malfunctioning compressor or because of the use of
viewed in the drawing thus permitting passage of com
a large amount of compressed air by another device, the
pressed air from the source through passageway 72, into
dies in the crimping tool will remain partially closed until
chamber 74', and thence through passageway 80 into cyl
full line pressure is regained and the dies can be com
inder 34 as shown in FIGURE 3. Piston 36 and plunger
.32 are thus driven towards cylinder 28 and the hydraulic
pletely closed. If full line pressure is not regained, the
;?uid in the bore of this cylinder is compressed to drive
dies will remain partially closed as a signal to the opera
the crimping dies relatively towards each other.
tor that the air pressure is inadequate and a proper crimp
can not be made. Under these circumstances, the arm
12% can be digitally lifted to open the dies.
to said intensi?er comprising, a compressed air source, a
passageway extending from said source to said intensi?er,
The instant invention also eliminates virtually all de
an inlet valve in said passageway normally maintained in
pendence upon the operator for proper tool operation.
the closed position by compressed air from said source,
If the operator merely squeezes the trigger momentarily,
bleeder valve means for relieving the closing pressure on
the tool will automatically cycle itself as explained above.
said inlet valve whereby, said inlet valve is opened upon
If the operator holds the trigger for several seconds, the
opening of said bleeder valve, automatic latch means en
dies will close and remain closed until the trigger is re
gageable with said inlet valve upon opening thereof to
leased at which time they will open. In the latter case,
maintain said inlet valve in open condition regardless of
when the dies complete the crimp, the relief valve is 10 the condition of said bleeder valve, and pressure sensi
opened and latch arm 134 is disengaged from the free
tive means for disengaging said latch means from said
piston, but the free piston itself is unbalanced and held
inlet valve upon attainment of a predetermined pressure
against cone 78 by virtue of the effect of the line pressure
in said intensi?er thereby to ensure completion of a crimp
against face 88. When the trigger is released, the pres‘
ing operation by said piston.
sure on face 104 and on the face of projection 102 is 15
5. In a ?uid operated crimping tool comprising a hy
sul?cient to drive the piston upwardly.
draulically actuated piston-cylinder, said piston having a
crimping die thereon, a single stroke pneumatic-hydraulic
intensi?er for supplying hydraulic ?uid to said piston
It will be noted that there is virtually no loss of com
pressed air when the trigger is squeezed excepting, of
cylinder and means for supply compressed air to said
which flows through restricted passageway 106 during
intensi?er comprising, a compressed air source, a pas
downward movement of the free piston. The opening of
sageway extending from said compressed air source to
the inlet valve 70, the closure of bore 1M by cone 78,
said intensi?er, inlet valve means in said passageway nor
and the closure of exhaust port 108, however, take place
mally maintained in closed condition by the pressure of
substantially simultaneously so that there is no direct flow
said compressed air source, bleeder valve means for re
of air from the compressed air ‘source through the ex 25 lieving the closing pressure on said inlet valve means
haust ports before they are closed.
whereby, said inlet valve is opened upon opening of said
In FIGURES 1-3, valve body 54 is represented in two
bleeder valve, spring biased latch means engageable with
portions of said inlet valve when said inlet valve is opened
dimensions in the interest of facile disclosure. The actual
course, the air in hose 112, and the small amount of air
to hold said inlet valve in open position, a plunger engage
construction of the preferred embodiment is shown in
FIGURE 1. Sealing rings on the several pistons and 30 able with said latch means to release said valve opening
cylinders of the disclosed embodiment have not been
means, a piston on the end of said plunger, and a pres
sure relief valve for admitting compressed air from said
speci?cally identi?ed in the description since their func
intensi?er to said pressure relief valve whereby, said pres
tions are believed to be obvious from the foregoing
description and the drawing.
sure relief valve is opened and said piston and plunger
Changes in construction will occur to those skilled in 35 are advanced to disengage said latch means from said
inlet valve ‘when the predetermined pressure of said relief
the art and various apparently different modi?cations and
valve is reached.
embodiments may be made without departing from the
6. A crimping tool comprising, a movable crimping
scope of the invention. The matter set forth in the fore
going description and accompanying drawings is offered
die, means including a source of pressurized ?uid and a
by way of illustration only. The actual scope of the 40 pressure intensi?er piston and cylinder for moving said
die upon admission of ?uid into said pressure intensi?er
invention is intended to be de?ned in the following claims
when viewed in their proper perspective against the prior
cylinder, a passageway extending from said source to said
intensi?er cylinder, an inlet valve in said passageway nor
I claim:
1. In a ?uid operated crimping tool comprising a hy
mally maintained in closed condition by said pressurized
?uid, inlet valve opening means normally biased by said
pressurized ?uid out of engagement with said valve and
draulically actuated piston-cylinder, said piston having a
crimping die thereon, a single stroke pneumatic-hydraulic
intensi?er for supplying hydraulic ?uid to said piston
movable into engagement with said valve to open said
valve upon bleeding pressurized ?uid therefrom, a spring
biased latch engagcable with said inlet valve opening
cylinder comprising, a compressed air source, a passage
way extending from said compressed air source to said
intensi?er, inlet valve means and exhaust valve means in
means upon movement thereof to maintain said valve
opening means in engagement with said inlet valve there
by to maintain said valve in open condition, ?uid actu
ated means engageable with said latch to disengage said
latch from said inlet valve opening means, a passageway
said passageway normally maintained in closed and open
position respectively by the pressure of said compressed
air source, bleeder valve means for relieving the closing
pressure on said inlet valve means and said exhaust valve
connecting said intensi?er cylinder with said fluid actuated
means whereby, said inlet valve is opened and said exhaust
valve is closed upon opening of said bleeder valve means,
means, and a relief valve in said passageway whereby,
compressed ?uid from said intensi?er cylinder is effective
to actuate said means upon attainment of the opening
latch means engageable with said inlet valve means to
pressure of said relief valve thereby to disengage said
hold said inlet valve means in open position, and ?uid
pressure actuated means for disengaging said latch means 60 latch from said inlet valve opening means and to permit
closure of said valve.
from said inlet valve means upon attainment of a prede
termined pressure.
References Cited in the ?le of this patent
2. Apparatus as set forth in claim 1 wherein said ?uid
pressure actuated means for disengaging said latch means
comprises a pressure relief valve operable upon attainment 65 2,310,625
Fischer _______________ .__ Feb. 9, 1943
of a predetermined pressure.
Dupre _______________ .._ Aug. 26, 1947
3. Apparatus as set forth in claim 1 wherein said
Dupre _______________ __ June 17, 1952
bleeder valve means in located on said hydraulically actu
Dupre _______________ _._ Aug. 18, 1953
ated piston-cylinder.
4. In a ?uid operated crimping tool comprising a hy
draulically actuated piston-cylinder, said piston having a
crimping die thereon, a single stroke hydraulic-pneumatic
intensi?er for supplying ?uid under‘ pressure to said
piston-cylinder, and means for supplying compressed air 75
Klingler _____________ __ July 20, 01954
Reasoner et al. _________ _ Iune 7, 1955
Demler ______________ __ June 3, 1958
Freedom ____________ __ May 26, 1959
Fischer et al ___________ __ Aug. 4, 1959
Dupre et al ___________ _.. Nov. 29, 1960
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