US2743503A

US2743503A - Wire connecting tool

Info

Publication number: US2743503A
Application number: US328713A
Authority: US
Inventors: Rudolph F Mallina
Original assignee: Bell Telephone Laboratories Inc
Current assignee: AT&T Corp
Priority date: 1952-12-30
Filing date: 1952-12-30
Publication date: 1956-05-01
Anticipated expiration: 1973-05-01

Description

May 1, 1956 R. F. MALLINA WIRE CONNECTING TOOL Filed Dec. 30, 1952 III llllllllllll Ill "Illllllillllll ATTORNEY M N mm m L N M E V R o W M G r R Q Q V B N mm Q Q k A A 3 Q aim-.503. NN T ITQO Rudolph F..- Mallina,.Hastings: on: Hudson; N. Y... assignor a .r l T ph n lab rato e ;.I rro ate Ne Y rk,. av acorrnrat a N Y k Application December 30, 1952. SerialN o. 328,-71'3 -Cl ims. (craze-3s) -"I his-invention relates towiring tools and more particularly to suchtools thatarecap'able of cutting and strip pingan insulated-wire andwrappi ng .a portion thereof on a terminal or the like. Tools of the type herein contemplated are known in the wiring 1art,for: example i thetool 1 disclosed in the applicatiorrofFrank"Reck,Serial No. 234,643yfiled June 30, 1951. The tool of thenoted=Reck application cuts an insulatedwire to length and mutilates-thc insulation in response to. manual operation of alever and then wraps and simultaneously .-stripsthe insulation from-the wire under motor powerzin' response-to manual. operation. of another lever or? trigger.

It is .an object of this inventionto'facilitate the operation of .a; combined: cutting. strippingand. wire wrapping tool.

More; specifical y. it. is: anobject. of: this. invention to effect w l apr zm r x l an -clea y. r mthete owi s a scription. of an illustrative:cutbocliment thereof taken in connection with the appended drawing inwhich:

Fig. 1 is a side view with parts broken away to show internal structure, of. .a.t0ol illustrative of this invention 7 with the hand lever and associated elements in the initial or unoperated condition;

Fig. 2 is a fractional side view similar to Fig. l with the parts in operated condition; and

Fig. 3 is a top view of the wire handling head.

As is shown in Fig. 1, the tool comprises a housing 10 containing a motor 50, and provided with a handle portion 11. A wiring or wire handling head 12 mounted on the housing includes a rotatable spindle 13 and a rotatable and reciprocable sleeve 14.

The spindle and sleeve are connected to a pinion 15, which is driven by a gear 16 connectable to the motor by means of a clutch 17. The clutch is operated by a shifting means 18 controlled by a connecting member 21. The shifting means 18 is also connected to a detent roller 22, which cooperates with a notch in-the plate 23 on the gear 16. These elements are essentially the same as those disclosed and more fully described in the application of Frank ,Reck, Serial No. 15,834, filed March 19, 1948, now Patent 2,649,121, issued August 18, 1953.

An operating or hand lever 24 is pivoted to the handle ll'and biased to the non-operated or initial position by a spring 25. An adjustable stop 26 and a stop 27 are secured to the lever 24 for respectively limiting the inward and outward movements of said lever. An adjustable stud 28 on the lever 24 cooperates with the connecting P tented May .1. 1 56 member 21 to operat the clu c n fle ntmean T adjus abl pr jection 1'. a so oath -lev 2 opera thernotor control switch 32. housed in the handle 11.

h n a con ectin t ..'han ev .2 w t th sleeve ,14 comprises. a bellcrank lever 33 mounted on; the housing and having; a cam portion34, for cooperation with a cam'follower 35 mounted onthe, outer end of thelever 24. The bellcrank'lever 33 is pivoted on the bracket "36 and biased'to the unoperated position shown in Fig. lby the spring 37'. The slotted upper end of the lever '33 emf which the sleeve is f'ree' to rotate. The lever 3 3' reciproe cates the cross-head and thus the sleeve byway of 'pius on the cross-head, one of which is shown at.

The cam follower'35 is adjustably mounted'on the hand lever24 byan eccentric means 42 and-.is biased against'a stop 43 by a spring--44. The bellcrank lever 33 has .a detent for the cam followercomprising-- an adjusting screw IS-adjacent a shoulder 46 of=the camportion 34.

An adjustable pin 47 on the: lever 33cooperateswitha plunger :48; mounted .on the housing '10- and-biasedtoward said pinby a spring-49. Thetwireshandlinghead. 12 is provided with insulation mutilating and wire guiding; jaws 5'1 and 52 onthe spindle and. the sleeve respectively. -A- wire cutting means comprisesaprojection 53 on the spindle anda shoulder 54 on the sleeve.

Theoperationof thetwire handling-yam of thisttoohis similar tothat described inthe noted; application. t Serial N0. .34,64 .t0f:Frank Keck. Withthe-toohappliedto ateIminaI, an. insulating wire isplacedbetweenthe jaws 51311452 an han pr s r s ppliedte.thehaahlever 2410 operateit iustenough to close-theiawsiwithout ppin h insu a ion. The w r istdtess d by. slidin it wee th iaw .m ainsert bet een the members-53 and- 54 of the wirecutter. ;'lf;he -hand.. lever 24 is-then fully operated to the limit. imposed by -the. stop 26. i

The cam follower .35-hav P8 een bnonghtintoeontact with the, surface of the cam portion 34-by the-initial opera tion of .t heleveiy24, ridesalong this surface,. r otating the bellcrank; lever 33 counterclockwise as seen in-Big. 1. The l r-1 11 1101 211 hem -head as... moves th sle v 14 to the left, crushing-.thefli fitllation between jaws-.51. and 52 and cutting. the'wirehetween members 53. and ,54. When, the tollowerfis enters the detent beyon the cam shoulder 46 the hellctank. lever is giveuaslight retrograde, (clockwise in Fig. l) movement under the influence of the spring 49 which has been compressed by the pressure of the pin 47 against the plunger 48 until the screw 45 comes to rest against the cam follower. This movement is enough to relax the

jaws

51 and 52 sulficiently to retain a grip on the insulation but not on the enclosed wire. The stud 28 then makes contact with the connecting member 21, engaging the clutch 17 and removing the detent roller 22 from its notch in the plate 23. The projection 31 operates the switch 32 to energize the motor, thereby rotating the spindle 13 and the sleeve 14 to wrap the connection, simultaneously stripping the insulation from the wire.

- The parts, except the spindle 13 and the sleeve 14, which are rotating, are in the condition shown in Fig. 2 during the wrapping operation.

Upon release of hand pressure thereon, the hand lever 24 returns to its initial position under the influence of the spring 25. The cam follower 35 rotates against the bias of the spring 44 sufficiently to allowsaid follower to ride out of the detent over the cam shoulder 46 and then returns to its position against the stop 43. The bellcrank lever 33 is returned to its initial position by the spring 37.

During the backward movement of the hand lever 24, the connecting member 21 is released allowing the detent roller 22 to enter its notch in the plate 23 when they are in register. The clutch is disengaged and the motor is de-energized. The tool is now ready for the next operation with the

jaws

51 and 52 in the initial position due to the indexing action of the detent means.

If upon operation of the tool it is found that the pressure of the

jaws

51 and 52 during the wrapping and stripping phase is sutficient to cause wire breakage or insuflicient to strip the insulation, an adjustment of the retrograde movement of the bellcrank lever 33 may be made with the screw 45. If it is found that the insulation crushing pressure is incorrect, adjustment may be made by changing the position of the cam follower 35 on the hand lever 24 by means of the eccentric pin 42. The other adjustable members such as 26, 28, etc. may also be changed if necessary.

What is claimed is:

1. A wiring tool for connecting an insulated wire to a terminal that comprises a housing, a wiring head including a rotatable spindle and a rotatable sleeve longitudinally movable on said spindle, the spindle and the sleeve having cooperating portions for receiving a wire when the sleeve is in one extreme longitudinal position, for cutting the wire to length and for mutilating a portion of the insulation when the sleeve is in the other extreme longitudinal position, and for wrapping a stripped portion of the wire on a terminal While simultaneously stripping the insulating therefrom when the sleeve is in an intermediate longitudinal position, a motor, a clutch for connecting the motor to the spindle and the sleeve, an operating lever pivoted to the housing and biased away from said housing, and a linkage between the lever and the sleeve including a bellcrank pivoted to the housing and having at one end a connection to the sleeve and at the other end a cam surface, a follower on the operating lever for contacting said cam surface to rotate the bellcrank in one direction and thus move the sleeve from said one to said other extreme position upon movement of the lever toward the housing, biasing springs on the housing for resisting rotation of the bellcrank, a depression on the bellcrank ad jacent the cam surface for receiving the follower to allow slight retrograde rotation of the bellcrank by the biasing springs to move the sleeve to said intermediate position, and means on the lever for making contact with means on the housing to initiate operation of the clutch and the motor to rotate the spindle and the sleeve.

2. A wire wrapping tool for connecting an insulated wire to a terminal that comprises a housing, a wire handling head including a rotatable spindle and a rotatable and reciprocable sleeve thereon, the spindle and sleeve having cooperating portions for receiving a wire, cutting the wire to length, mutilating a portion of the insulation, and wrapping a stripped portion of the wire on a terminal while simultaneously stripping the insulation therefrom, a motor, a clutch for connecting the motor to the spindle and the sleeve, an operating lever pivoted to the housing, and a linkage between the operating lever and the sleeve including a bellcrank lever pivoted to the housing. and having at one end a connection to the sleeve and at the other end a cam surface, a follower on the operating lever for contacting said cam surface to rotate the bellcrank lever and thus reciprocate the sleeve upon movement of the operating lever toward the housing, biasing means on the housing for resisting rotation of the bellcrank lever, a depression on the bellcrank adjacent the cam surface for receiving the follower to allow slight retrograde rotation of the bellcrank lever, and means on the operating lever for making contact with means on the housing to initiate operation of the clutch and the motor to rotate the spindle and the sleeve.

3. A wire wrapping tool for connecting an insulated wire to a terminal that comprises a housing, a wire handling head including a rotatable spindle and a rotatable and reciprocable sleeve thereon, the spindle and sleeve having cooperating portions for receiving a wire, cutting the wire to length, mutilating a portion of the insulation, and wrapping a stripped portion of the wire on a terminal while simultaneously stripping the insulation therefrom, a motor, a clutch for connecting the motor to the spindle and the sleeve, means on the housing for respectively controlling the motor and the clutch, an operating lever pivoted to the housing, and a linkage between said lever and the sleeve including a bellcrank pivoted to the housing and having at one end a connection to the sleeve and at the other end a cam surface, a spring biased cam follower on the operating lever for riding upon said cam surface to rotate the bellcrank in one direction and thus reciprocate the sleeve, upon movement of the operating lever toward the housing, biasing means on the housing for resisting rotation of the bellcrank, a depression on the bellcrank adjacent the cam surface for receiving said cam follower to allow slight rotation of the bellcrank in the opposite direction, and means on the lever for operating the motor and the clutch controlling means to initiate operation of the clutch and the motor to rotate the spindle and the sleeve.

No references cited.