US2480107A - Cable stripping tool - Google Patents

Description

mg. m, wm. A www ETAL www? CABLE STRIPPING TOOL Filed May 21, 1945 HTTO NEY Patented Aug. 30, 1949 CABLE STRIPPING TOOL Alan Baldwin, Newark, and William J. Steeds,

Bloomfield, N. J., assignors to Federal Telephone and Radio Corporation, New York, N. Y., a corporation of Delaware Application May 21, 1945, Serial No. 594,864

This invention relates to a cable stripping tool, particularly to a braid cutting tool, and has for an object to provide a tool for stripping braid from an insulated cable.

Another object of the invention is to provide a self-opening hand tool for readily separating braid from the insulation of a cable and for severing the separated braid.

A further object of the invention is to provide a portable tool which will strip `only the braid from the cable without injuring the insulation or conductor.

With the above objects in view, one embodiment of the invention discloses a, braid stripping tool having a pair of spring-separated handles to which are operatively connected a reciprocating hollow plunger with a bevelled cutting face and a cooperating stationary cutting die, the plunger in its forward movement being adapted first to separate the braid from the insulating material, next to receive the braidless insulated conductor within its bore, and nally to shear off the separated braid upon contact with the cutting edge of the die.

A more complete understanding will be obtained from the following description of a preferred embodiment of this invention taken in conjunction with the accompanying drawing in which:

Fig. l is a perspective view of the tool in its retracted or normally open position,

Fig. 2 is a sectional view taken along line 2--2 of Fig. l, illustrating separation of the braid from the insulated donductor,

Fig. 3 is a sectional view taken along line 3-3 of Fig. 2, and

Fig. 4 is an enlarged view of the plunger-die portion of the tool in the operative or closed position illustrating severance of the braid from the cable.

Referring now to the drawing, there is shown a braid stripping tool I having a pair of handles il, I2 of such size and shape as to be readily encompassed by a persons hand. Adjacent the forward end of lower handle I2 there is formed a groove I3 into which is secured, as by a press fit operation, a perforated block or die I4 having a bevelled inner peripheral edge I6 at the front and a counter bore I1 at the back. Into counterbore i1 is forced an annular bushing I8, preferably of hardened drill rod material, having a sharp cutting inner peripheral edge I9. The cutting face 20 of the die I4 is shown to be of greater width than that of the handle I2 in order to increase the strength thereof, particu- 1 Claim. (Cl. 81-9.5)

larly at its junction with the upper surface of the handle I2, the side edges 2| above the upper surface of the handle being tapered frontwardly and the lower side edges 22, downwardly to the width of this handle.

Intermediate the handle I2 is shown a yoke member 23, preferably formed in the shape of a bell crank, having lower bifurcated arms 24 embracingly engaging handle I2, being affixed thereto by bolts 26 and pins 21. At the upper portion of the yoke member 23 is shown a pair of arms 28 between which is pivotally connected by pin 29 the upper handle II of the stripping tool I0. Intermediate the bifurcated arms 24 and 28 of member 23 is formed an axial bore 3l having a lining A32, preferably of hardened drill-rod material, for reciprocatingly supporting therein a plunger 33, also preferably of hardened drill-rod material. Adjacent the rearward end of the plunger 33 is shown a reduced section or groove 34 with shoulders 35 for abutting engagement by bifurcated arms 36 of a plunger-actuating member 31 iixedly secured by bolts 38 to the upper handle II.

To provide a predetermined longitudinal movement of plunger 33, a peripheral protuberance or back-stop 39 is formed on the exterior thereof, as shown, a spring member 4I! being interposed between handes Il, I2 for retracting the tool IIJ to its open position with back-stop 39 abutting against yoke member 23. A bevelled edge 4I for cooperation with edge I9 is formed at the forward or cutting end of the plunger 33 with an axial bore 42 of predetermined diameter extending interiorly therein. The diameter of bore 42 is preferably equal to the outer diameter of the insulation 43, the bevelled edge 4l of the plunger 33 being adapted to slide between this insulation and the braid 44 of a cable 46.

In operation, a cable 46 having a braid 44, an insulation 43, and conductor 41 is inserted through the bore of die I4 until it engages the bevelled cutting edge 4I of plunger 33. While holding the cable 46 in this position, the handles II, l2 are squeezed together, upper handle I I pivotally moving actuating member 31 and yoke 36 in an arc whereby the plunger 33 is translatorily moved forward to separate the braid 44 from the insulation 43 without injuring the insulation, which with the contacter 41 is received into the plunger bore 42. Upon further movement the plunger 33 severs braid 44 from the cable 46 by shearing engagement with the cutting edge I9 of the die I4. Thereupon, release of the pressure opens handles II, I2 retracts the tool I0 to its open position under influence of spring member 40. Additional portions of the braid 44 may be removed from the cable 46 by repeating the above process. It is, of course, understood that in the event that an additional length of braid 44 is to be removed from the cable 4.6 the first severing operationfmay be eliminated and the 4handles l I, I2 released to their open position, the cable 46 being carried inwardly with the plunger 33. Pressure is then 11e-applied to the handles Il, l2 and the additional length of braid 44 is separated from the insulation 43 and severed in the abovedescribed manner.

Although the invention has been described 'by illustrating a specific embodiment thereof, it is clear to anyone skilled in the mechanical art that many modifications are possible by the xsubstitution of mechanical equivalents withoutzdeparting from the spirit of the invention and the scope `of the appended claim.

What .is claimed is:

An instrument, for use .in removing a lportion .of a sheath surrounding the .end of a tubular member, that comprises a rsthandle element; an .anvil mounted Yon .said first handle Jelement .near the distal end thereof, having an annular cutting edge surrounding an opening vextending through said anvil ,substantially parallel to the handle, adapted to receive the tubular member and surrounding sheath; a yoke mounted on said .rsthandle Velement intermediate 'the `endszthereof and havingan opening formed therein Vaxially aligned with the opening 'in .the anvil; Ya hollow .plunger slidably mounted in the opening in the yoke, 'having a bevelledcutting edge on the lend facing the anvil, the .opening inisaid hollow plunger being eapable .of .receiving an end portion of said tubular vmember 'but not its. sheath whereby when an .end portion of the .sheathed `by movement of the second handle element toward the first handle element causes movement .of 'the fcutting edge of the plunger into con-- .tacting engagement with the anvil whereby the spreadxportionof the sheath is annularly cut from .the .end of the sheathed tubular member.

ALAN BALDWIN. WILLIAM J. STEEDS.

REFERENCES CITED The following references are of record in the file -of this patent:

'UNITED 'STATES PATENTS Number Name Date 16.64.846 Espenlaub Jan. 1, .17901 .751,079 iKraeuter Feb. 2, 1904 A`835,740 Walden Nov. 13, 1906 1,475,273 Bernard Nov. 27, .1923

15567,'812 Ober et al Dec..29, 1.925

1,743,826 .Martens Jan. .14, .1930

.-1,7.87;358 .Clay Dec. 30, 1930 2,149,935 Chambless Mar. 7, `1939 2,217,077 Phillips Oct. l8, 11940 .2,376,858 4Barrans .May 29, 1945 2,386,328 Rollings Oct. 9, .1945

FOREIGN PATENTS Number Country Date 460,683 Great 'Britain Feb 2, 1937

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