(12) United States Patent
`Wilhelm et al.
`
`(10) Patent N0.:
`(45) Date of Patent:
`
`US 6,176,116 B1
`Jan. 23, 2001
`
`US006176116B1
`
`(54) CRIMPING TOOL FOR CRIMPING LEAD
`END SLEEVES AND THE LIKE
`
`(75) Inventors: Edgar Wilhelm, Altersbach; Horst
`Hofmann, Unterschoenau, both of (DE)
`_
`_
`(73) AsslgneeZ §ennSt711§hWerkZeu(g§gmbH>
`iernau
`ueringen
`
`( * ) Notice:
`
`Under 35 U.S.C. 154(b), the term of this
`patent Shall be extended for 0 days'
`
`_
`(21) Appl' NO" 09/334’296
`22 Filed;
`un, 16 1999
`(
`)
`J
`,
`
`7
`(51) Int. Cl. ................................................. .. H01R 43/042
`(52) U-S- Cl
`- 72/409-12; 72/402; 81/313;
`81/367; 81/427~5
`(58) Field of Search .......................... .. 72/409.12, 409.01,
`72/402; 81/313, 427.5, 367
`_
`References Clted
`Us‘ PATENT DOCUMENTS
`
`(56)
`
`1342312 * 9/1963 (FR) ..................................... .. 81/313
`886259
`1/1962 (GB) ~
`1 324 253
`7/1973 (GB).
`* Cited b examiner
`y
`Primary Examiner—Daniel C. Crane
`(74) Attorney, Agent, or Firm—Michael J. Striker
`(57)
`ABSTRACT
`_
`_
`_
`_
`A crimping tool for crimping lead end sleeves, contact
`sockets, or plugs on the electrical conductors, tWo crimping
`jaWs arranged in a tool head section for performing
`crimping, pivotably mounted and axially ?xed in the tool
`head section, and formin a crim in a erature of ad'ustable
`g
`p g p
`J
`cross-section, the crimping jaWs on their outer peripheral
`Surfaces receiving a pivot lever and are bringable into and
`out of a crimping position by a pivoting drive movement of
`the pivot lever, a toggle lever mechanism driven by the
`handles and effecting the pivoting drive movement of the
`pivot lever, for a force-stroke compensation betWeen parts of
`a force transmission system, the crimping jaWs in a region
`of their crimping pro?le being formed by a die surface and
`a sliding surface, the die surfaces ‘of the'crir'nping jaWs
`forming a die pro?le of closed shape in all crimping position
`Within an adjustable crimping range, the sliding surface of
`each of the crimping jaWs being in planar contact With the
`die surface of an adjacent one of the crimping jaWs, extend
`ing a plane of the adjacent die surface, the handles including
`a ?xed handle formed as a compensating spring for force
`k
`.
`b
`h
`f h f
`str'o ‘e compensation etWeen t e parts 0 t e orce tran's
`mlsslon System and an 6121596 lave? lute/greed and ?xed 1“
`the ?xed handle and mechanically linked With one lever arm
`of the toggle joint mechanism.
`
`-
`
`-
`
`10 Claims, 2 Drawing Sheets
`
`"III
`
`28
`
`4 V
`
`2,079,498 * 5/1937 Douglas ............................... .. 81/313
`3,199,335
`8/1965 Holmes et a1- -
`3,203,078 * 8/1965 Ustln -
`3’33O’148
`7/1967 Homung """ "
`.
`. . . . .. 81/313
`3,713,322 * 1/1973 Fischer . . . . . .
`_ 72/40912
`473817661 * 5/1983 Wiener ~~~~ n
`5,261,263
`11/1993 Whitesell ............................. .. 72/402
`
`' 72/4O9'12
`
`. . . . .. 81/313
`
`3,459,029 * 8/1969 Rosenfeld . . . . .
`
`FOREIGN PATENT DOCUMENTS
`
`31 O9 289 C2
`0 158 611 B1
`
`8/1987 (DE) .
`7/1990 (EP) .
`
`Page 1 of 7
`
`EDWARDS LIFESCIENCES EX. 1117
`Edwards Lifesciences v. Boston Scientific Scimed
`U.S. Patent No. 6,915,560
`
`

`
`U.S. Patent
`U.S. Patent
`
`Jan. 23, 2001
`Jan. 23, 2001
`
`Sheet 1 0f 2
`Sheet 1 of 2
`
`US 6,176,116 B1
`US 6,176,116 B1
`
`Page 2 of 7
`
`Page 2 of 7
`
`

`
`U.S. Patent
`U.S. Patent
`
`Jan. 23, 2001
`Jan. 23, 2001
`
`Sheet 2 0f 2
`Sheet 2 of 2
`
`US 6,176,116 B1
`US 6,176,116 B1
`
`Page 3 of 7
`
`Page 3 of 7
`
`

`
`US 6,176,116 B1
`
`1
`CRIMPING TOOL FOR CRIMPING LEAD
`END SLEEVES AND THE LIKE
`
`BACKGROUND OF THE INVENTION
`The present invention relates to a crimping tool for
`crimping lead end sleeves, contact sockets or lugs onto
`electrical conductors. More particularly it relates to a crimp
`ing tool Which has crimping jaWs Which are arranged in the
`tool head section, are enclosed by a pivot lever and can be
`moved centrally relative to one another by the pivoting drive
`movement of the pivot lever effected by a toggle joint
`mechanism and thereby brought into and, on the return
`stroke, out of the crimping position. Its jaW surfaces partially
`abut in their active region form, together With the adjacent
`crimping jaWs, a crimping aperture of adjustable cross
`section. An elastic compensation, automatically actuated
`during the crimping process and effected by springs, is
`created betWeen parts of the force transmission system in
`order to compensate for differently dimensioned die pro?les
`and the resulting variable crimping stroke.
`The compensation of the respective crimping stroke pro
`duced by the differently dimensioned die pro?les Within the
`drive mechanics of the crimping tool existing betWeen the
`handles and the crimping jaWs is already necessary in order
`to guarantee the uniformity and quality of the crimping
`Within a given siZe range of lead end sleeves and electrical
`conductors and in order to prevent breakage of tool parts by
`possible overloading. In this respect, it is particularly advan
`tageous to provide this compensation in a resilient and
`elastic manner, eg by a spring element, Which has been
`found in practice to considerably improve and facilitate the
`use of the crimping tools.
`The crimping tool is ensured against possible premature
`opening of the crimping jaWs by a paWl lock knoWn in
`design and application. Once introduced, an operating stroke
`for the respective crimping is carried out in full in all cases.
`In crimping tools With crimping jaWs opening in a scissor
`like manner, the compensation of crimping stroke differ
`ences has been effected in that only one of the mouth jaWs
`is rigidly articulated. The other mouth jaW is articulated via
`an elastic Zone, also in the form of a separate elastic element,
`to the associated handle With the interposition of the actu
`ating member; eg a toggle lever mechanism (DE-PS 3109
`289).
`In contrast, in crimping tools designed according to the
`generic type, the compensation of the crimping stroke dif
`ference can be designed in such a manner that an elastically
`acting support, Which is expediently formed by a separate
`elastic element, is arranged on at least one of the force
`transmitting elements (EP-PS 0158 611). In this case, a
`toggle lever belonging to the force transmitting system is
`constructed at its outer hinged point so as to be displaceable
`against the action of a tension spring and is thereby able to
`adapt to a limited degree, together With a paWl lock, to the
`pro?le Which is to be crimped. This type of indirect elastic
`support of the pivot lever accommodating the crimping jaWs
`must be regarded as disadvantageous in many respects, since
`crimping errors Which can occur in the degree of completion
`of the crimping can go unnoticed and therefore cannot be
`ruled out.
`Crimping tools according to the generic features for
`crimping lead end sleeves onto electrical conductors have
`crimping jaWs Which are arranged in the tool head section,
`are enclosed by a pivot lever formed by the tool limb and can
`be displaced centrally relative to one another by the pivoting
`movement of the pivot lever. Thereby they can be brought
`into and out of the crimping position (US. Pat. No. 3,203,
`078).
`
`10
`
`25
`
`35
`
`45
`
`55
`
`65
`
`2
`In this type of crimping tool, the pivot lever is brought
`into a drive connection With the crimping jaWs via a splined
`shaft pro?le, and the pivot lever is accommodated and
`displaceable in a centring fashion on the outer peripheral
`surfaces of the crimping jaWs. The crimping jaWs are
`pivotably mounted and axially ?xed to the loWer base plate
`of one crimping tool part on through bearing pins.
`Because of the type and shape of the die and also the
`design of the structural operating elements, the crimping
`tool proposed here is unsuitable for crimping lead end
`sleeves. The latter require crimping Which is complete on all
`sides, is as uniform as possible over the entire cross section
`and has precise dimensions, Which cannot be achieved using
`crimping tools of this type.
`Further knoWn tool designs for crimping electrical con
`ductors are illustrated and described in US. Pat. No. 5,261,
`263, US. Pat. No. 3,199,335, GB-PS 886,259 and GB-PS
`1,324,253. These tool designs are also unsuitable for meet
`ing the current demands of connecting or crimping technol
`ogy in poWer electronics in terms of providing crimping
`Which has shape precision, is non-destructive and secure.
`Furthermore, they are neither suitable for repeated crimping,
`nor are they simple and easy to handle. Whilst the structural
`operating features have been complicated in design and
`require relatively high technological outlay, it is also pre
`cisely these elements Which impair the operating properties
`of these crimping tools as regards high operating position
`precision and a loW degree of operational disturbance.
`It is also true that multi-surface crimping tools of this type
`require very precise movement of the crimping jaWs, par
`ticularly in the case of small and miniature crimping
`dimensions, for instance in the range beloW 1 mm2, and
`therefore require a similarly precise drive or force transmis
`sion system and springing system betWeen the displaced
`crimping tool parts.
`To date, knoWn designs of this type of crimping tool
`cannot ful?l the expectations in practice, or can only ful?l
`them to an unsatisfactory degree. It is these circumstances
`Which have given rise to the purpose and object of the
`present invention.
`
`SUMMARY OF THE INVENTION
`The purpose of the invention is the further technological
`and operational perfection of the type of tool in question.
`This gives rise to the object of the invention, Which, in a
`crimping tool of this type, Whilst essentially retaining a
`toggle lever for the drive of the pivot lever, is to improve and
`re?ne the kinematic system of the crimping jaWs, to simplify
`and perfect the force-stroke compensation provided for
`application betWeen the force transmission elements, and to
`construct the crimping jaWs With a more effective die pro?le.
`This object is attained according to the invention by a
`crimping tool for crimping lead end sleeves, contact sockets
`or lugs onto electrical conductors, having crimping jaWs
`Which are arranged in the tool head section, perform the
`crimping, are pivotally mounted and axially ?xed in the tool
`head section on through bearing pins, jointly form a crimp
`ing aperature of adjustable cross section, are enclosed by a
`pivot lever Which drives them, on their outer peripheral
`surfaces receive the pivot lever in a centring and drive
`transmitting manner in a spline shaft pro?le, and can be
`brought into and out of their crimping position by the
`pivoting drive movement of the pivot lever effected by
`means of a toggle lever mechanism driven by handles.
`The tool also has a force-stroke compensation, Which is
`automatically effected, eg by springs, and is arranged
`
`Page 4 of 7
`
`

`
`US 6,176,116 B1
`
`3
`between the handles and the crimpingjaWs, being created in
`the crimping tool betWeen the parts of the force transmission
`system in order to compensate for crimping pro?les of
`different dimensions and the resulting variable crimping
`stroke during the crimping process, the crimping jaWs being
`formed in the region of their crimping pro?le by a die pro?le
`surface and a sliding surface in each case, and the die
`surfaces of all the crimping jaWs forming a die pro?le of
`closed shape (eg a square or hexagon) in all crimping
`positions Within their adjustable crimping range, to Which
`purpose the rotational or pivot axis of the crimping jaWs is
`de?ned by the median perpendicular formed by the straight
`line extending from the respective pro?le corner toWards the
`pro?le center, together With the pitch circle chosen for the
`bearing pins, and the sliding surface of each crimping jaW
`being in planar contact With the die surface of the adjacent
`crimping jaW, extending the plane of the adjacent die
`surface, and the ?xed handle being constructed as a com
`pensating spring for force-stroke compensation betWeen
`parts of the force transmission system by means of a
`reduction in its cross section in the form of a Waist in its
`middle section, together With an elastic lever integrated and
`?xed in the handle and mechanically linked With one lever
`arm of the toggle joint mechanism.
`In accordance With another feature of the present inven
`tion the crimping jaWs have a pro?le on their die surface
`such that the crimped surfaces of the lead end sleeves are
`formed With a crimped pro?le that may be either circum
`ferential or offset, the pro?le being formed by a basic
`triangular shape, Whose pro?le points are rounded.
`In accordance With still a further feature of present
`invention the elastic lever is constructed as part of the handle
`and has both a positive and friction connection With said
`handle at its rear end section by means of bolts and splines.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`The invention Will be illustrated and explained in further
`detail in the folloWing by Way of an embodiment With the aid
`of the associated draWings, in Which:
`FIG. 1 is an overall vieW of the crimping tool With all
`fundamental operating parts;
`FIG. 2 is a detailed vieW for the construction of the spring
`elements shoWn as a partial section through the right-hand
`crimping tool handle;
`FIGS. 3 and 4 shoW the geometric relationships for
`constructing and arranging the crimping jaWs and the kine
`matics thereof; in the case of hexagonal and square crimp
`ing;
`FIG. 5 shoWs a crimping jaW With a vieW of its die surface
`construction;
`FIGS. 6 and 7 are schematic illustration of the possible
`types of crimping on lead end sleeves;
`FIG. 8 is a partial cross section through the die pro?le of
`a crimping jaW.
`
`10
`
`15
`
`25
`
`35
`
`45
`
`55
`
`DESCRIPTION OF PREFERRED
`EMBODIMENTS
`
`The crimping tool 1 is constructed in knoWn manner from
`tWo base plates 2, 3, Which at one end form a head section
`4 and at the other end handles 5 and 6. Formed in the
`right-hand handle 6 approximately in its middle section is an
`outer elastic Zone 8, Which is expediently created by a Waist
`7. It is capable of springing in and out relative to the adjacent
`head section 4 and the handle 5 When a corresponding force
`is applied, as Will be described below.
`
`65
`
`4
`Also arranged approximately in the same section is an
`inner or inWardly-lying spring 9. It is constructed as an
`elastic lever, is displaceably held at one of its ends and has
`a common hinge point 10 or clamping region 10 With the
`outer elastic Zone 8 of the right-hand handle 6.
`At its other freely projecting end, Which is constructed as
`an open bearing seat 11, the spring 9 is connected in a
`positive-locking manner With a toggle lever 12. The latter is
`mounted in the left-hand handle 5 and, as shoWn in FIG. 1,
`belongs in a manner knoWn in principle to a toggle lever
`mechanism, comprising the levers 12 and 13 and the handle
`5, and forms the operative element of this crimping tool
`drive. The other of the tWo toggle levers, in this case bearing
`the reference numeral 13, is constructed betWeen the com
`mon bearing point 14 and the bearing point 15, the latter
`belonging to the pivot lever 16 Which is to be driven.
`The pivot lever 16 is arranged betWeen the tWo base plates
`2 and 3 of the crimping tool body 1. It is connected for the
`drive action, as already mentioned, With the toggle lever
`mechanism at the bearing point 15 by means of a bracket 17
`provided on the pivot lever 16. According to the invention,
`the pivot lever 16 is resiliently supported via the lever
`traction of the toggle lever against the elastic elements 8 and
`9.
`
`On its output side, the pivot lever 16 is connected to the
`crimping jaWs 18 of the crimping tool. This connection is
`based on positive locking produced by a splined shaft pro?le
`19. This detail is clearly shoWn in FIG. 1 and in particular
`in FIGS. 3 and 4. In this respect, it should be emphasiZed
`that Whilst this arrangement of the pivot lever 16 is guided,
`it is otherWise freely displaceable.
`As already proposed, the crimping jaWs 18 are connected
`to the loWer base plate 3 and pivotably mounted thereon With
`the aid of a through bearing pin 21.
`In this respect, the spatial arrangement, the mounting and
`the Working pro?le of the crimping jaWs 18 ful?l the
`folloWing geometric requirements as part of the solution
`according to the invention:
`The pro?le Which is to be formed by the pivotable
`crimping jaWs 18, as shoWn in the plane of the draWing, is
`formed in each case by the die surfaces 22, 23 lying adjacent
`one another. This is shoWn in FIGS. 3 and 4. The die surfaces
`22 and 23 can be designed for polygonal crimping, prefer
`ably for square or hexagonal crimping. The geometric
`design and mechanical adjustment is effected in an entirely
`rosette-like manner, as shoWn in FIG. 1.
`The pivot point 24 of the crimping jaWs 18 lies in each
`case on the median perpendicular 25 Which is formed
`betWeen one of the corner points of the maximum crimping
`pro?le and the pro?le center point 26 thereof. In respect of
`the arrangement and mounting of the crimping jaWs 18, it
`should also be noted that the distance of the bearing pins 21
`from the pro?le center point in each case determines the
`degree of the transmission Which is effective in this case and
`also the siZe of the crimping area.
`In the embodiment of the present invention, the transmis
`sion ratio is preferably 1:1.
`The tWo elastic elements 8 and 9, Which according to the
`invention represent a neW, simple and advantageous tech
`nical solution to the problem of compensating the different
`crimping areas Which arises in crimping tools of this type are
`securely joined together in the rear end section of the
`right-hand handle 6. The joining is performed by trans
`versely penetrating bolts 27 and longitudinally imprinted
`splines 28 and act in this region as a compact unit. This is
`important for the function and property of the springs 8 and
`9 beyond their common hinge point 10.
`
`Page 5 of 7
`
`

`
`US 6,176,116 B1
`
`5
`Several further construction features determining the
`functional characteristic of this crimping tool lie in the
`design according to the invention of the crimping jaWs 18.
`These are pro?led on their actual die or crimping surfaces 22
`in such a manner that either a circumferential crimping
`pro?le, as shoWn in FIG. 7, or an offset crimping pro?le, as
`shoWn in FIG. 6, is selectively formed on the crimped
`surfaces 29 of the lead end sleeves 30. The pro?le advan
`tageously has a basic triangular shape 31, as indicated in
`FIG. a The pro?le points 32 are rounded.
`The operation of the crimping tool in accordance With the
`present invention is as folloWs:
`With the handles 5 and 6 open and the toggle levers 12,
`13 tilted inWards, the crimping space 32 provided betWeen
`the crimping jaWs is also open. The parts Which are to be
`crimped together can be introduced and brought into their
`crimping position.
`In order to crimp the parts, the handles 5, 6 are closed. In
`so doing, the toggle lever 12, 13 is moved into its extended
`position “A—B” and thereby pivots the pivot lever 6 in the
`direction of the arroW “C” until the crimpingjaWs 18, Which
`are also displaced under the in?uence of this pivoting
`movement via the splined shaft positive locking, reach their
`crimping position on the Workpiece. With the further closure
`of the crimping tool handles 5, 6, the shaping crimping of the
`parts occurs. It continues until the toggle lever reaches its
`end position, just short of its extended position, and the paWl
`lock is overrun and therefore rendered inoperative, so that
`the crimping tool can open.
`When crimping relatively large cross sections or generally
`When crimping cross sections of different siZes, it is
`necessary, given that the operating stroke of the handles and
`also of the toggle lever mechanism remains constant at all
`times, to effect a force-stroke compensation in the interior of
`the crimping tool.
`As is knoWn, this compensation is necessary so that the
`crimping tool can be closed over different-crimping cross
`sections using the usual manual force and also in order to
`release the action of the paWl lock.
`This compensation in the force transmission system,
`Which is expediently effected elastically, is provided by the
`springs 8 and 9, Which optionally attempt to de?ect in the
`direction of the arroW “B”. Depending on the required force
`in the crimping Zone 1 the spring characteristic curves of the
`tWo elastic elements can complement each other in a prac
`tical manner in order to guarantee complete shape-crimping
`on the parts and also to alloW for a corresponding simple and
`pleasant handling of the crimping tool.
`It Will be understood that each of the elements described
`above, or tWo or more together, may also ?nd a useful
`application in other types of constructions differing from the
`types described above.
`While the invention has been illustrated and described as
`embodied in crimping tool for crimping lead end sleeves, it
`is not intended to be limited to the details shoWn, since
`various modi?cations and structural changes may be made
`Without departing in any Way from the spirit of the present
`invention.
`Without further analysis, the foregoing Will so fully reveal
`the gist of the present invention that others can, by applying
`current knowledge, readily adapt it for various applications
`Without omitting features that, from the standpoint of prior
`art, fairly constitute essential characteristics of the generic or
`speci?c aspects of this invention.
`
`10
`
`15
`
`25
`
`35
`
`45
`
`55
`
`65
`
`6
`What is claimed as neW and desired to be protected by
`Letters Patent is set forth in the appended claims.
`What is claimed is:
`1. A crimping tool for crimping lead end sleeves, contact
`sockets, or plugs on the electrical conductors, comprising
`means forming a tool head section; tWo handles, tWo crimp
`ing jaWs arranged in said tool head section for performing
`crimping, said crimping jaWs being pivotably mounted and
`axially ?xed in said tool head section through bearing pins
`on Which said crimping jaWs are pivotably mounted and
`axially ?xed; said crimping jaWs forming a crimping apera
`ture of adjustable cross-section; a pivot lever for driving said
`crimping jaWs, said crimping jaWs on their outer peripheral
`surfaces receiving said pivot lever in a centering and drive
`transmitting manner and are bringable into and out of a
`crimping position by a pivoting drive movement of said
`pivot lever; a toggle lever mechanism driven by said handles
`and effecting the pivoting drive movement of said pivot
`lever; means arranged betWeen said handles and said crimp
`ing jaWs for a force-stroke compensation betWeen parts of a
`force transmission system in order to compensate for crimp
`ing pro?les of different dimensions and resulting variable
`crimping stroke during a crimping process, said crimping
`jaWs in a region of their crimping pro?le being formed by a
`die surface and a sliding surface, said die surfaces of said
`crimping jaWs forming a die pro?le of closed shape in all
`crimping position Within an adjustable crimping range, for
`Which purpose a rotational axis of said crimping jaWs is
`de?ned by a median perpendicular formed by a straight line
`extending from a respective pro?le corner toWard a pro?le
`center, together With a pitch circle chosen for said bearing
`pins, said sliding surface of each of said crimping jaWs being
`in planar contact With said die surface of an adjacent one of
`said crimping jaWs, extending a plane of an adjacent die
`surface, said handles including a ?xed handle formed as a
`compensating spring for force-stroke compensation betWeen
`parts of the force transmission system by a reduction in its
`cross-section in form of a Waist in a middle section to form
`an elastic Zone in said ?xed handle; and an elastic lever
`integrated and ?xed in said handle, said elastic lever having
`one end hingedly connected With said ?xed handle and
`another end mechanically linked With one lever arm of said
`toggle joint mechanism, said ?xed handle and elastic lever
`operating as tWo elastic elements.
`2. A crimping tool as de?ned in claim 1, Wherein said
`crimping jaWs on their outer peripheral surfaces receive said
`pivot lever in a spline shaft pro?le.
`3. A crimping tool as de?ned in claim 2; and further
`comprising spring means arranged betWeen said handles and
`said crimping jaWs for automatically effecting the force
`stroke compensation.
`4. A crimping tool as de?ned in claim 1, Wherein said die
`pro?le of closed shaped of said die surfaces of said crimping
`jaWs is square.
`5. A crimping tool as de?ned in claim 1, Wherein said die
`pro?le of closed shaped of said die surfaces of said crimping
`jaWs is hexagonal.
`6. A crimping tool as de?ned in claim 1, Wherein said
`crimping jaWs have a pro?le on said die surface such that
`crimped surfaces of the lead end sleeves are formed With a
`crimped pro?le, said pro?le of said crimping jaWs being
`formed by a triangular shape Whose pro?le points are
`rounded.
`7. A crimping tool as de?ned in claim 6, Wherein said
`crimping jaWs have such a pro?le on said die surface that the
`crimping pro?le formed on the lead end sleeves is circum
`ferential.
`
`Page 6 of 7
`
`

`
`US 6,176,116 B1
`
`7
`8. A crimping tool as de?ned in claim 6, wherein said
`crimping jaws have such a pro?le on said die surface that the
`crimping pro?le formed on the lead end sleeves is offset.
`9. A crimping tool as de?ned in claim 1, Wherein said
`elastic lever is formed as a part of said ?xed handle and has
`both a positive and a friction connection With said ?xed
`handle at its rear end section.
`10. Acrimping tool for crimping lead end sleeves, contact
`sockets, or plugs on the electrical conductors, comprising
`means forming a tool head section; tWo handles, tWo crimp
`ing jaWs arranged in said tool head section for performing
`crimping, said crimping jaWs being pivotably mounted and
`axially ?xed in said tool head section through bearing pins
`on Which said crimping jaWs are pivotably mounted and
`axially ?xed; said crimping jaWs forming a crimping apera
`ture of adjustable cross-section; a pivot lever for driving said
`crimping jaWs, said crimping jaWs on their outer peripheral
`surfaces receiving said pivot lever in a centering and drive
`transmitting manner and are bringable into and out of a
`crimping position by a pivoting drive movement of said
`pivot lever; a toggle lever mechanism driven by said handles
`and effecting the pivoting drive movement of said pivot
`lever; means arranged betWeen said handles and said crimp
`ing jaWs for a force-stroke compensation betWeen parts of a
`force transmission system in order to compensate for crimp
`ing pro?les of different dimensions and resulting variable
`
`10
`
`15
`
`25
`
`8
`crimping stroke during a crimping process, said crimping
`jaWs in a region of their crimping pro?le being formed by a
`die surface and a sliding surface, said die surfaces of said
`crimping jaWs forming a die pro?le of closed shape in all
`crimping position Within an adjustable crimping range, for
`Which purpose a rotational axis of said crimping jaWs is
`de?ned by a median perpendicular formed by a straight line
`extending from a respective pro?le corner toWard a pro?le
`center, together With a pitch circle chosen for said bearing
`pins, said sliding surface of each of said crimping jaWs being
`in planar contact With said die surface of an adjacent one of
`said crimping jaWs, extending a plane of an adjacent die
`surface, said handles including a ?xed handle formed as a
`compensating spring for force-stroke compensation betWeen
`parts of the force transmission system by a reduction in its
`cross-section in form of a Waist in a middle section; and an
`elastic lever integrated and ?xed in said handle and
`mechanically linked With one lever arm of said toggle joint
`mechanism, said elastic lever being formed as a part of said
`?xed handle and having both a positive and a friction
`connection With said ?xed handle at its rear end section, said
`positive and friction connection being formed by bolt and
`splines.
`
`Page 7 of 7