US2894424A - Tweezer type wire stripping tool having an adjustable stop and stop latching means - Google Patents

Description

July 14, 1959 c. s. vAuGHAN, JR 2,894,424

TWEEZER TYPE WIRE STRIPPING TOOL HAVING AN ADJUSTABLE sToP AND sToP LATCHING MEANS Filed April 24, 1958 w., r armar/1111 f:

Char/es Swoope wugharAJ/z I9 1N VEN TOR.

\ 34 n I BY United States Patent C TWEEZER TYPE WmEsTRIPPiNG ToorJ HAVING QIJUSTABLE sToP AND simi LATcrnNG This invention relates to tools for stripping single con-V ductorA cables of insulation sheathing and is designed as an `improvement over the cable stripping tool of U.S. Patent No.` 2,691,822, dated October 19, 1954.

An 'important object of this invention is to provide a combination tool for stripping the insulation sheathing oi single conductor cables either Iby means of crosscutting and stripping knives for cutting rings in the sheathing, or by means of a sliter splitting the sheathing longitudinally.

n,Another'object is to provide a tool for the above purposes vembodying cross-cutting and stripping knives for straddling the sheathing of conductor cables of a wide variety of sizes and cutting rings crosswise therein together with settable means of simple reliable form for preventing the knives from cutting into the conductor of such cables.

Still another object is to provide in conjunction with the foregoingysettable means for determining the depth ofthefcutinthe sheathing according tothe size of the onductori--and which vis easily operative by the thumb 'of'a hand grasping` the tool rwhile the other hand is free to. hold 'the conductor cable.

These together with other objects and advantages which will become subsequently apparent reside in the details of 4construction and'oper'ation as more" fully hereinafter described'and claimed, reference beinghad to fthe accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure l is a view in perspective of the improved tool in the preferred embodiment thereof;

Figure 2 is an enlarged view in longitudinal section taken on theline 2 2 of Figure l;

Figure 3 is a View in transverse section taken on the line 3-3 of Figure 2;

Figure 4 is a view in side elevation on a smaller scale illustrating the use of the tool, and

Figure 5 is a fragmentary view in longitudinal section further illustrating the use of the tool.

Referring to the drawing by numerals, the tool of this invention, and which is designated generally by the numeral 1 comprises a atbar shank 3 from which a pair of rear, at,resilient handle bars 4, 5 extend in facing spaced apart relation with free rear ends 7. Thehandle bars 4, 5 are fixed to theshank 3 in oppositely offset relation thereto for flexing toward each other and reaction away from each other into normally slightly diverging relation as shown in Figures 1, 2 and 3. For

, this purpose one of thehandle bars 5 is joined to the `shank 3 |by a frontend bent portion 9, whereas theother lhandle bar 4 is fixed to said shank with a front end tongue 'L11 bolted on theshank 3, as at 13, and to which said ,handle bar 4 is joined by abent portion 15. In this way thehandle bars 4, 5 are secured together at one end Athereof. To obviate cutting of a hand grasping the handle `bars 4, 5 said bars are provided with longitudinalnarrow edge flanges 17. A pair of cutter andstripper blades 19 of rectangular shape are secured by rightangled flanges 21 thereon andscrews 23 to the handle n 2,894,424 Patented July 14, 1959 Fice .bars 4, 5 at said rear ends 7 at right angles to thehandle bars 4, 5 between the pair for overlapping slidably engaging relation in cutting and are provided with opposite V-notch cutting edges for movement toward each other by such movement of thehandle bars 4, 5 to straddle the insulation sheathing 27 of aconductor 29 and cut through the sheathing. The cutting edges 25 are beveled, at at 31, on remote sides of thecutter blades 19 so that said edges Z5 will cut in a substantially common plane. v

The settable means is interposed between thehandle bars 4,- 5 to varialbly limit movement thereof toward each other and correspondingly limit movement of said cut ting edges 25 and comprises the following. A rectangular, flat,rblock 33 is secured byscrews 35 to an intermediate portion of thehandle bar 5. Astop disk 35 is interposed |between theblock 33 and theother handle bar 4 flatwise relative thereto and is provided with an axial stem 37 threaded through saidblock 33 and saidhandle bar 5 for screw feed adjustment of thestop disk 35 transversely of thehandle bars 4, 5 into different set positions,

I in Which it limits movement of thehandle bars 4, 5

toward each other and similarly limits movement of said cutting edges 25.

A circumferentialbase edge flange 39 on thedisk 35 is provided for rotating said disk bya thumb of a hand grasping thehandle vbars 4, S and is knurled to prevent the thumb from slipping off the same.

Means for locking thehandle bars 4, 5 together, in compressed position, comprises a secondcircumferential edge ange 41 on thestop disk 35 forming with the flange 39 acircumferential groove 43 in said. disk.

A flangedlocking slide 45 is longitudinally slidably mounted on the inner face of thehandle bar 4 and is adapted for advance froma retracted position, shown in Figure 2, to hook itsange 47 under theange 41 to ride in thegroove 43. For mounting theslide 45, a threadedl headedstud 49 traversing alongitudinal slot 51 in theV.handle bar 4 is slida'ble in said slot and threaded into said slide.

Afriction brake plate 53 of resilient metal is secured by screws 55 to one side of theblock 33 transversely of the stop disk 3S and bears against theknurled ange 39 to frictionally hold the stop disk in set positions.

Asheathing slitter 57, similar to that of the aforesaid patent, is provided on the front end of theshank 3 and comprises acutter blade 59 bolted, as at 61, to said shank and having arear cutting edge 63 transverse to saidshank 3 for slitting sheathing, and arunner shoe 65 on said blade longitudinal to theshank 3 and adapted to run between thesheathing 27 and aconductor 29 to guide thecutting blade 63 along a cable sheathing for slitting the sheathing longitudinally.

The use and operation of the invention will be readily understood from the following brief description thereof taken in conjunction with the foregoing. Thelocking slide 45 is normally retracted in theslot 51 to disengage theflange 47 from theflange 41 and move the same out of thegroove 43. With the thumb of the hand grasping thehandle bars 4, 5, thestop disk 35 is screw fed with the thumb of the hand toward thehandle bar 4 whereby to move said handle -bars 4, 5 apart and similarly move thecutter blades 19 so that one end of aconductor cable 67 of a selected size to be stripped may be inserted by the other hand between theknives 19 with a slight clearance. Thestop disk 35 is then screw fed Aaway from the handle -bar 4 until thehandle bars 4, 5 may be compressed and moved toward each other to correspondingly move theknives 19 until thecutting edges 31 bite through thesheathing 27 and lightly touch theconductor 29, as s'hown, for instance, in Figure 4.

Now, with the hand levers 4, thus depressed, the tool may be rotated to cut a cross ring into sheathing 27' to separate a length of the sheathing from the remainder and then pulled along theconductor cable 67 to pull thelength 69 oli theconductor 29.

Theslitter 57 may be used when desired to slit thelength 69 from a out ring in the sheathing, if desired; The locking slide may be advanced to lock theflange 47 under theflange 41 to lock thehandle bars 4, 5 in compressed or partly closed position and hold a setting of the tools while theslitter 57 is being used. In this connection thegroove 43 is slightly Wider than the thickness of theflange 47` so that the tool may be locked in approximate outting and stripping position, as shown in Figure 5, when the slitter S7 is being used', whereby to approximately retain a setting` of the tool while theslitter 57 is being used and to facilitate entering thellange 47 in thegroove 43.

From the foregoing, the construction and operation of the device will be readily understood and further explanation is believed to be unnecessary. However, since numerous modications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction shown and described, and accordingly all suitable modiications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed las new is as follows:

l. A tool for stripping insulation sheathing from a conductor of a conductor cable comprising a pair of opposed spaced apart handle bars connected together at one end, said handle bars being resilient for compressing them toward each other, a pair of transverse cutter blades between said handle bars xed thereto transversely thereof and having opposite coacting V-shaped cutting edges for straddling a cable sheathing, said tool being operated in response to compression of and rotation of said handle bars to out a ring transversely in said sheathing to separate a portion of the sheathing from the remainder for stripping from said conductor by saidblades 4 yby pulling said blades along said cable, settable screw feed stop means on one handle bar between said pair of handle bars for limiting compression of the handle bars whereby to prevent said blades from cutting into a conductor, and means on the other handle bar coacting with said stop means for locking said handle bars in compressed position, said position being limited by said stop means, said last named means comprising a slide on the other handle bar lockably engageable with said stop means.

2. A tool for stripping insulation sheathing from a conductor of a conductor cable comprising a, pair of op,- posed spaced apart handle. bars connected together at' one end, said handle bars being resilient for compressing them toward each other, a pair of transverse cutter blades between saidl handle bars xed theretoj transversely thereof and having opposite coacting V-shaped cutting edges for straddling a cable sheathing, said tool being operated in response to. compression of and rotation of said handle bars to cut a ring transversely in said sheathing to separate a portion of the sheathing from the remainder for stripping from said conductor by said ,blades by pulling said blades along said. cable, settable screw feedv stop means on one handle bar betweensaid pair'Qf handle bars for limiting compression of the. handle. bars whereby to prevent said blades from cutting into a Com ductor, and means on the other handle bar coacting with said stop means for locking said handle b ars in -Q0mpressed position, said position being limited by said, Stop means, said stop means including a block mounted Qn one handle bar, la stop disk having a stem threaded finto said block for screw feed setting of said disk, and a resilient plate mounted on said block and extending upwardly alongside the disk with the surface of the plate bearing against the periphery of the disk. thereby fric.- tionally retaining the stop disk in set position.

References Cited in the le of this patent UNITED STATES PATENTS Re. 14,169 Aaron July 25, `1916 1,685,977 Bollerrnan Oct. 2, 1928 2,451,463 Zimmermann Oct. 19, 1948 2,691,822 Vaughn Oct. 19, 1954 2,787,177 Frye Apr. 2, 1957 FOREIGN PATENTS 740,874 France ..V...-.......... .Feb- ,2, 123.3

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