US1675838A - Hand tool - Google Patents

Description

'July, 3, 1928. 1,675,838

' W. A. BERNARD HAND.TOOL 7 Filed April 25, 1924 2 Sheets-Shet 1 I0 33 2 II I 62 u I July 3, 1928.

w. A; BERNARD HAND TOOL Filed April 23 -1924 2 Sheets-Sheet 6 .6.

v VII HEY/114214 Patented July 3, 192 8.

UNITED STATES BERNARD, OF NEW HAVEN,

WILLIAM A.

v V I I conmsc'ncu'r, Assienon :10 THE WILLIAM soHoLLHon N COMPANY, on NEW HAVEN, counncrrcu'r.

Application filed April 2a, 1924 senaino. 708,556.

This invention relates to hand tools and especially to tools such as pliers, pinchers punches, wire cutters, or the 11ke,in which lever members or other means are PIOVlded' to bring together a pair of opposed co-o rating 111WS with more or lessforce. ore

particularly the invention relates'to a tool of this character wherein provision is 'made for the cutting of insulated electrical conductors,

and for subsequently cutting and stripping the insulation from the conductor wire enclosed thereby.

Previous to this invention, the usualp'ractics of preparingan insulated wire for' attachment to an electrical appliance or for connection with another conductor, consisted of cutting or scraping the insulation from the wire with a knife or similar tool. In case of stranded conductors wherein a plurality of comparatively fine wires are twisted together this method occasionally. caused considerable trouble due-to the cutting of the outer Wires, thereby reducing the current carrying capacity 'ofthe conductor. In the case of a solid conductor,this method occasionally caused trouble due to the accidental cutting into the surface thereof to such a degree that the wire would ruptureand when under possible fire hazardQ To replace the hand operation ofstripping a wire by the use of a knife,:certainle'ver operated devices have been suggested which, though somewhat improving thismethod still retainedthe dis-j advantages above referred to relative to the mutilation of the enclosedconductor.

One object. therefore, of this invention is to provide a hand tool of this character for stripping the insulation from'a conductor \VlllllOlll; the cutting means in any way afl'e'ct-j mg the surface of the conductor or mutilating the same to cause the above dISadVELIIf Another ob ect of lilllS'lIlVOl'llilOIl '18 to pro vide a hand tool for use in removing the Insulation or-covering from an enclosed wire or CO1'G, 1Y1 which one oftheioperations is performed practically simultaneously with I the other by the continued closingaction of the jaws of said tool. 1 i

A. still further object is to provide an efiicient hand'to'ol of this character wherein an insulated wire may be satisfactor ly prepared for electrical connection with an appliance or the like by having a portion ofits insulating covering severed at a desired point and stripped from the conductor wire, both movement of the tool jaws.

I Another object of this invention is to provide a tool having novel means for transmit ting movement of handles or lever members to movable jaws, wherebya relative movement of the same is produced so thata relativelysmall :force exerted onthe handle or lever members will produce a relative movement of the jaws with a powerful force.

'A still further obj ectof my invention is, to improve certain details of construction of tools of this character, so. that a variety of operations may be performed with the same tool, preferably such operations as are usually performed together or successively in the same line'of work. i

Another object of this invention is the provisionin hand tools of this character of improved means to cut the insulation surrounding a conductor and to strip the same from the conductonf i 7 operations being performed on the same I sists in the novel features and combination of parts to be hereinafter described and. claimed.

In the accompanying drawings: 7

Fi 1 is a side view of a hand tool embodymg the principlesof my invention;.

Fig. 2 is a View of t'he'opposite side. of the same; f '3 i at Fig. 3 is a front edge view of Fig. 2; Fig. 4is an end view of thetool;

Fig. 5 is a view similar to Fig. 2, with the jaws of the. tool open to receive an insulated wire in proper position for stripping the insulatio therefrom; I Fig. 6 is a section on line 6 6 a Fig. 5;

Fig 7 is .an enlar ed View of the jaws looking in the directionof arrows 9-9 of. Fig. 7 ,shOwirig the relation and form ofthe insulation cutting and stripping means.

The hand toolillustrated in the drawings may be termed a wireinsulation stripper, and as shown embodies the principles 'of my invention. -This tool comprises a pair of Fig. 9 is a view of the end of the tool jaws 10 and 11 arranged in opposed relation and adapted by the use of suitable operating means to be parallelly moved relatively to each other to cause the opposingworking surfaces to co-operate. The jaws are provided. with rearwardly extending shank portions 12 and 13, respectively. The jaws 10 and 11, with the respectivershank portions 12 and 13, are superimposed one upon the other and therefore in'operatiom'each slides relatively to the other-with their adjacent surfaces. in contact. v

-The operatingnieans provided for causing the movement of: the. jaws asabovede scribed, consists of a pair of handle'mei'nhers 14 and15.,rand a pairoflinks 20= and The handle membersu14. and 15' are;

21. pivoted together and to the jaw 1L by suitable means, such as a, bolt or screwv 16. The: bolt; 176i passes through both the jaw shank portions- 12: and 13," passing. through ,a restrictedlopeningl'f in. the shank portion 13v and an elongated slot'l or opening; 18 in the portion 12, whereby theIjaW-IO is allowed longitudinal movement relatively to the jaw 11". The pair of links'20 and 21 are allysecure'd together, and to the shank portion 12 by abolt or. screw. .19: The bolt.l9.

passes through both the: shank portions 12 and 13, passing throughza restrictedopenmg 22 in the shankportion 12and an elongated opening 23 in the portion 13, whereby the jaw '11 is allowed longitudinal movement relatively to the 10.xThe other end of powerful action when the jawsare: drawn together or closed, the parallel movement being obtained by reason; of the, fact that both the-pivot points and bolts-.16= and 19'act as guiding means as wells as movlng means for the jaw extensions 12a11d 13, the bolt 16 actin'g to guide the extension12rand move the extension 13 While the vbolt-.19-ae'ta to guide theextension' 13 and to-move the extension 12. A powerfuhclosing actlon is created because of the connecting arrangement of the handle members 14. and 15 ,in

the links and 21, whichi are so arranged that the combination thereof forms a double toggle, wherein the operatingxforceas. ap-

' plied at the points 24' and 25,respectively.

One toggle consists of'the-linked member 20 and the portion of the handle member 14 lying between the pivot 24 and the bolt 16', Whilethe other toggle consists ofthe link member 21 and aportion of the handle member 15, lying; between the: pivot. 25 and" the The jaws 10 and 11 extend laterally bepivot- 7 yond the shank or leg portions12 and 13, respectively, at each side thereof and with the shank or leg portion form, what might be termed as a whole, a pair of T shaped jaws A lateral extensionat one side of the aw portion 10 is provided with a out tin or shearing edge 31, which is opposed an co-operates with, a similar extension 32 having a cutting or shearing edge 33, provided upon the aw vportion 11. Upon the closingof the-jaws these shearing edges pass to an insulation covered electricalconductorr Similar means-co-operating with the. above is provided int-he lateral extension 41 ofthe jaw portion 11. As shown in this instance,-

a plurality of such means are provided as clearly sho'wnin the drawings at 42, 43 and. 44' and maybe operated to remove the insulation from'a relatively large, medium. or. relatively small wire, respectively, depending'aupon requirements. As each of the insulationremovingmeans is of similar form witlrthe exception of being adapted to oper ate upon different sized conductors; like The lateral v r I r reference. characters will be used todesige y nate like surfaces, cutting edges and operas, tive parts thereof.

' Theinsulation removin means'42 43'and I g a seml-circular 44 includes a substantially groove 45,, formed, in the jawportion 10,

with a similar groove 46 formed in the jaw portion: 11. These grooves preferably, eX-J tend longitudinally with respect to the longitudinalaxis of saidtool acrossthe jawportions and are in alignment with each other whereby they register when the jaws are closed and form a clearance opening for the-conductor or wire and being ofa diametersuflicient to permit the conductor or .wire to-be enclosed thereby during the strippingoperation. The j awportions 10 and 11 are; cut away as at 47 and 48, whereby shoulders 49 and 50'are' formed. The material at each side of the cut away portions 47 and 48 is shaped to provide cuttingedges 51 and 52 in-the jaw portion 10, and 53 and 54in the'jaw portion 11. The cutting edges 51 and 52, and-'53 and: 54, forming respectively a pair of cutting edges'on' each jaw and which extend substantially lengthwise thereof and longitudinally. with-respect to the longitudinalaxis. of the tool, are flared outwardly from the respectiveshoulders 49 and 50 to facilitate the longitudinally directed ,shearingiaction required thereof. In addition to these cutting edges, other cutting edges 55 and 56 are formed in the jaw portion 10, one edge on either side of the groove 45, and cutting edges 57 and 58 are formed in the jaw portion 11, one edge on either side of the groove 4,6.

At the extreme outer edge of the jaw portions 10 and 11 a guide member 59 is provided to insure that the jaw portions 10 and in proper position upon for such engagement. 7 j

The operation of the insulation removing means will now be described and reference is directedespecially to Figs, 5, 7 and 8, wherein an jinsulated electrical conductor or the like 70, is shown in various steps of having the insulation or covering 71 removed from the wire or core 72. The insulation covered wire or core is placed between the jaws 10 and 11,'say within the co-operating insulation removing means 43, as shown 1n Figs. 5 and 7. The jaws, the proper manipulation of the handle members 14: and 15, are drawntoward each other in a direction longitudinally with respect to the longithe jaw portion 10 tudinal axis of the tool with considerable force as above described. This action causes the cutting edges 51 and 52' of the jaw portion 10 and the opposing edges 53 and 54 of the jaw portion 11 to cut into and through the insulation 71, but due to these edges being spaced apart the required amount, for the particular Wire or core to be uncovered, by the: respective grooves 45 and 46,"the wire or core is not acted uponby the aforesaid edges and so is not nicked, out or marred. The

jaw closingaction is continued resultingin.

the shoulder 49 and the side cutting edges 55 and 56 of the jaw portion 10 and the shoulder 50'and the side cutting edges 57 and 58 of the aw portion 11 being brought into cont-act with the insulation or covering 71, whereby the same'is cut at the sidesby' the aforesaid cutting edges. At this time, the portion 73 of the insulation (see Fig. 8) is substantially wholly severed from the remainder and is engaged by the shoulder 4-9 and forced downwardly and from enclosing engagement with the wire or core 72 by the continued closing operation of the jaws. During this operation the shoulder 50, which is in engagement with j the remainder of the insulation 71,- prevents the movement thereof and holds the conductor engaged beneath the head 62 of a headed member 63, mounted therefrom with an end of the same having a portion of the'insulation removed there- 'reverse movement of the handle from and the wire or core in a bare condition for suitable connection with any desired electricalappliance; 1

I do not limit myself to the exact details shown in this' my preferred form of hand tool,'nor to the specific usev thereof, as

described above,-as the same capable of many modifications and variations which will lie within the spirit of the invention and the scope of the appended claims.

Vhat I claim is: Q i

1. A hand'tool comprisinga pair of superimposed'cooperating jaws, an extension on each of said jaws, means to drawsaid jaws toward each i a pivot pin connecting one link of said toggle with one jaw, said pivot pin passing through the other jaw, a pivot pin connecting theother link of said toggle tothe extension of the other jaw, said second'mentioned pivot pin passing through the exten-I;

sion of said first mentioned jaw, each of said pivot pins acting, as a guide for one of said jaws duringits movement.

.2. A hand tool comprising a pair of superimposed cooperating T shaped jaws each having a leg portion, operating handles for said jaws, a pivot pinpassing through both of-said jaws to connect said handles to one of said jaws, a link pivoted to each of said handles, a pivot'pin passing through the leg portion of both of said T shaped jaws to connect said links together and to the leg portion of the other ofsaid T-shapedjaws. '3. A handtool having a pair of superimposedcooperating jaws, each of said jaws beingprovided with anextension, a pair of handle members pivotedtogether and to one of said jaws bya common-pivot, said handle pivot passingthrough an elongated opening int-he other of said jaws, a pair'of links pivoted together and to the 1 extension of the other of said jaws by a common pivot, said link pivot passing through an elongated opening in the extension of the. first mentioned jaw, said "links also respectively connected to said handles. i i

4. In a hand tool, a pair of co-operating jaws, rearwardly directed extensions upon each of said jaws, said extensions and jaws being in superimposedrelation to each other, handle members for operating said jaws, a pivoting member connecting said handle members together and of saidhandle members, a pivoting .member other comprising'a toggle,

to one of said jaws, :link members respectively connected to each I portion of said covering from'the 'wirewhile said cutting jaws'are bemg, moved toward.

to the extension; of theother of. said jaws,;.

said pivoting members respectively co-operating with the second. mentioned jaw and the extensionof the first mentioned; jaw

. within elongated openings therein-to guide thejaws in their openingand closingimovements. I

5.- In a. hand tool, a pair. of parallel opcrating cutting jaws, means to move said jaws toward each other, said jawsqbeing adapted to cut through the insulation about the-wire of an-insulation covered conductor, and means to-subsequently StllPtllB severed moved: toward each other, and means operable to strip; the severed covering from the core member during; a: continued movement of 'saidjaws in the same direction.

7 In ahand tool, a. pair of. cutting jaws, means to move said ij awstoward eachother, and means on-said jawsco-operating while they are beingmoved -towardqeach other after having cut' through the covering about a: coremember, to remove K the severed 1 covering from Said-00113..

8. In a hand.-=tool, a pair: of cutting jaws slidableone upon the otherto sever the cover-ing: from a coremember, a pair of operating handlesconnected to said jaws, and cooperating means-upon. each of said jaws tofsubsequently remove the severed covering from said were member during the operation of saiduj'aws by said handle-members to drawsaid'jaws toward' each other into a superimposed position;

9.:Ina. hand. tool, a pain of parallel operating. jaws, meansto operate said jaws, and meanstoremove the covering from a core member, said covering removingineans comprising a. pair of: cutting: edges in cooperative'position uponeachjaw whereby a portion of the coveringfabout thecore memher is severed fromtheremainder when said jaws aremoved toward each other, and a shoulder between each of'thecutting edges ofeach pain'to cause the severed portion of the covering to be forced fromthe core when the aforesaid movement of said'jaws is continued.

10. Ina hand tool,sa pairof jaws slidable oneupon the other, a pair of operating handles, and means to remove the covering from a core member while said jaws are being-moved: in a. direction toward each other substantially transversely of said core member, said covering removing. means comprising-a pair of spaced apart cutting edges in co-operative position. upon each jaw,,.and a removed. V c.

13. Inahand tool,.meanscomp'r1smg two member.

11. In a hand tool, a. pair of jaws slidable one upon the other, operating means for 'said jaws, co-operating: means on each of said 'aws com IISin a air of cuttin ied es'ex b 23 t) tending lengthwise of the tool, and a shoulder disposedbetween the cutting edges of each jaw..

are caused toapproach each other in 'parallel co-operating movement, cooperating means on each of said jaws comprising a pair of cutting. edges extending lengthwise of the toohand a shoulder disposed; between said cutting edges whereby the covering, about. may be first severed. and then.

core member co-operating pairs of cutting edges adapted to straddle a covered core member, co-operating shoulders between the cutting edges of each pair, and means to successively move said pairs oi cuttingedges-and shoulders to; ward each other whereby a. portion of the covering about the core member is first;

severedby said edges and then removedfro'm the core by said shoulders.

14. In a hand tool, a ,pairlof provided with. two cosoperati-ng. pairs ofcutting edges adapted to. straddle a covered core member,- co opera'ting shoulders between the cutting edges of each pair, a groove in e'ach jaw extending from eaclrof saidishoulders,

and means to operate said jaws wherebysaid pairs of cutting edgesand shoulders will move toward each other to sever the covermg about thecore and remove a portion 12. Ina hand tool,:a pair of jaws operating means for sald. aws whereby said. JaWSf thereof from the core, said grooves register- 7 ing topresent a clearanceopening for the core when the jaws aresooperated.

15. In a hand tool,.a pair of j aw. members slidable one upon the other,,operatingmeans for said jaw members, each oflsaid jaw members having. a groove, extending longitudinally w thv respect to the longitudinal axis of. said tool, said grooves registering when said aw members are in superimposed relation, a shoulder formed at the termina tion of the grooves in saidj aw members, and a cutting edge adjacent I each side of the shoulder upon each jaw-membensaid'cut ting edges extending longitiulinally with respect to'the longitudinal axis of-said tool beyond said shoulders. r 16. In a hand tool, a pairof jaw members,

operating means for said-51' aw members, each of said jaw members having agroove extending longitudinally with'respect to the longitu'dinal axis of said tool, a; shoulder. formed at the termination of each groovefanda cutting edge adjacent. each. side. of? the shoulder upon eachfj aw member, said cutting axis of said tool to close the same, each jaw havmg a lateral extenslon thereon, and co- 7 operating means 011 the lateral extension of each of said jaws to remove the covering from a core member when said jaws are operated to close the same.

18. In a hand tool, a pair of jaws slidable one upon the other, a pair of operating handles, and means to remove the covering from a core member while said jaws are being moved in a direction toward each other, said covering removing means comprising a pair of cutting edges onsaid jaws and a shoulder between said cutting edges, said shoulder being longitudinally directed with respect to the direction of movement of said jaws. 1

19. In a hand tool, a pair of jaws slidable one upon the other, a pair of operating handles, and means to removethe covering from a core member while said jaws are being moved in a direction toward each other, said means comprising a pair of cutting edges in opposed relation upon each jaw to sever the covering, and a shoulder between the cutting edges upon each jaw to space the same apart and to remove the covering from said core member, said shoulders being in opposed relation,

20. In a hand tool, a pair of jaws slidable one upon the other, a pair of operating handles, and means to remove the covering from a core member while said "aws are being moved in a direction towar each other, said means com rising a pair. of cutting edges inopposed relation upon each jaw, and a shoulder between the cutting edges upon each jaw to space the same apart, said shoulders being in opposed relation, one of said shoulders being adapted to engage a severed portion of the core covering and the other of said shoulders being adapted to engage the unsevered portion to separate the same and remove the severed portion from the core member.

I 21. In an insulation stripper, cooperating jaws havinga longitudinally directed movement with respect to the longitudinal axis of the tool, and means to move said jaws, each of said jaws being provided with means to first sever the insulation about a com ductor transversely thereof, and to then strip it from said conductor longitudinally thereof when said jaws are. moved toward each other in the aforesaid direction.

22. In an insulation stripper, cooperating jaws having a longitudinally directed movement with respect to the longitudinal axis of the tool, and means to move said jaws, each of said jaws having means thereon to sever the insulation about a conductor transversely thereof during a part of the movement of said jaws, and to stri the insulation from the conductor. longitu inally thereof by the continued movement of said jaws in the same direction.

In witness whereof, I have hereunto set my a hand this 9th day of April, 1924.

. WILLIAM A. BERNARD.

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