US2391721A - Insulation slitting tool - Google Patents

Description

Dec. 25,1945. c.v.1| uNDl-:EN :2,391,721

INSULATION SLITTING Tool.

AFiled April 8, 1944 Y 2 sheets-sheet 1 INVENTOR l LUNDEEN ATTORNEY Dec. 25, 1945. C. v. LUNDEEN 1 2,391,721

INsULATIoNVsLI'TTING TooL A Filed April 8, 1944 2 Sheets-Sheet 2 INVENTOR.

TTORN E Y Patented Dec. 25', 1945 lINSULATION sLrr'rINo Toor.

Carl V. Lundeen, Towson, Md., assignor't'o Western Electric Company, Incorporated, New York, N. Y., a corporation of New York Application April 8, 1944, Seriall No. 530,164'

16 Claims.

This invention relates to insulation slitting tools and has for its object the provision of new and improved insulation slitting tools.

One fixture embodying the invention comprises a base, an upright secured to the base, arcutting blade, means for securing the blade to the upright, and means for holding an article against the blade.

A complete understanding of the invention may be obtained from the following detailed description of a speciiic embodiment thereof, when read in conjunction witlrthe appendeddrawings, in which Fig. 1 is a side elevation of axture embodying the invention;

Fig. 2 is a plan view of a cable slit by the xture shown in Fig. 1;

Fig. 3 is a vertical section of the' fixture taken along line 3 3 of Fig. 1, and

Fig. l is a fragmentary plan view of the nxture..

Referring more specifically to the drawings, there is illustratedA a device for slitting,l insulating. j ankets. on wires, cables. andthe like. This device comprises a horizontal base. plate I0 (Fig. 1), which is bolted to the top of a work table III., and which hasl a vertical plateA I2 secured thereto; A vertical guide roller I4 having'a peripheral groove I5 is rotatably secured to theV platel I2. The right end of an arm I6, asy viewed in Fig. 1, is pivotally secured to the plate I2 and an adjustable, calibrated screw II (Figs. 1 and 4')- mounted on a lug I9 formed on. the plate I2 limits the clockwise movement of the arm I5, as Viewed in Fig. 1, by acting as. an abutment against' which a plate 2!) bolted to the top of the arm I6 strikes. A tension 'sp-ring 2 I attached to the. plate I 2y and to the arm I6 urges the4 arm upwardly.

A pin (Fig. 3) is rotatably secured'in an aperture 26, iorrnedinthe-arm I6, by a set screw 2T projecting into a grooV'e'ZS formed. in the pin 25. A cutting blade. having a cutting edge formed on one end thereof, projects through a hole 3l formed in the pin-.25 andis adjustably secured therein by a set screw 32. The blade 30- is urged in a clockwise direction, asl shown in Fig. 1, with respect to the arm IIi'b'yV a torsion spring 34 (Fig. 2) secured to the blade 30 and toA the arm I6. This movement of the blade 30iis limited by the plateZIl.

A pair of rollers 33-33 are rotatably mounted.` at the left of the roller I4 on a bracket 28. These rollers servev to maintain theuend of a cable 38y in a horizontal position when the `end. of the cable is positioned in the groove I 5.

In the operation Vof the device described hereinabove, to slit a jacket 36.(Fig. 3) of thel cable 38, the end of the cable 38 is inserted between the rollers 33-33 and through the upper portion of the groove I5 ofthe roller I4 from the left,

as viewed in Fig, 1, thecable forcing the blade 30 to turn in a. counterclockwise direction to the position shown in dotted lines in that figure as it is so inserted. After the cable 38 is inserted the desired distance, it is drawn a sho-rt distance to the left, as viewed in Fig. 1. d As the cable is drawnto the left, the cable and the torsion spring 34 rotate the cutting blade 3i] in a clockwise direction until the blade strikes the plate 2-0', at

which time the cutting` edge 35 projects through the jacket 35 formed on a cable core 39. The operator then draws the cable 38 farther to the left whereby a longitudinal slit such as a slit 4I (Fig. 2) is formed in thefjacket36. v

Thecable 38- isy guided by the rollers I4 and 33-33 as it is'withdrawn therefrom. The roller I4 holds the cable adjacent to and in the same plane as the cutting blade 30 and is rotated easily as the cable is drawn thereover. Thus the roller I4 does not retard the cable: as the latter is withdrawn.

The rollers 33-33 maintainV the end of the cable 38 in a horizontal position and rotate very easily as the cable is drawn therebetween. Thus,

. the cable is maintained substantially perpen- The calibrated'set screw I1 may be threaded l farther into or out of the lu-g I9 to adjust the position of the cutting blade 30 with respect to the roller I4 to adapt the Xture for slitting cables whose diameters are larger or smaller than the cable 38, or to cables having thicker or thin-- ner jackets thanthe jacket 36.

What is claimed is:

1. In a fixture for slitting jackets of rubber covered cables, a support, a-cutting blade, an arm for pivotally mounting the cutting blade on the support, means spaced from the cutting bladefor holding an article against the cutting blade whereby ar portion of an article drawn therebetween is cut byl the cutting blade, and a calibrated adjustment screw engaging thev blade mounting meansior selectively varying the distance between the cutting blade and the' article holding means'.

2. In a fixture for slitting jackets of rubber covered cables,A a support, a cutting blade, an Aarm for securing the cutting blade pivotallywith respect tothe support in a pla-ne parallel with the support, means for limiting the pivotal movement off the arm with respect to the support, and means spaced a predetermined distance from the4 limiting means for holding an article to be' cutto theusuppo'rt, a cutting blade secured to thev lever, means for limiting the movement of the lever with respect to the support, and means spaced a predetermined distance from the limiting means for holding an article to be cut against the cutting blade.

4. In a fixture for slitting jackets of rubber covered cables, a support, a lever pivotally ,Y

mounted on the support, a cutting blade pivotally secured to the lever, an adjustable calibrated set screw for limiting the movement of the lever with respect to the support, means for limiting the movement of the blade with respect to the lever, and a roller mounted on said support for forcing an article to be cut against the cutting blade.

5. In a fixture for slitting jackets of rubber covered cables, a support, an elongated blade, a pin for mounting the blade pivotally on the support, means for limiting the movement of the blade with respect to the support, and a roller positioned adjacent to the blade for guiding a cable past the blade, whereby the blade is pressed against the limiting means and cuts the insulating jacket of the cable.

6. In a fixture for slitting jackets of rubber covered cables, a support, a lever pivotally mounted on the support, a cutting blade secured to the lever. an adjustable stop for limiting the movement of the lever with respect to the support, means for urging the lever against the stop, and a roller mounted on said support for forcing an article against the cutting blade.

7. In a fixture for slitting jackets of rubber covered cables, an upright support, a cutting blade pivotally mounted on the support, means for limiting the pivoting movement of the cutting blade in one direction, means for holding a cable against the cutting blade, and means for urging the cutting blade toward the limiting means, whereby the cutting blade penetrates and slits a jacket of the cable as the cable is drawn between the holding means and the blade.

8. In a fixture for slitting jackets of rubber covered cables, an upright support, a lever pivotally secured to the support, a blade secured to the lever, a stop for limiting the movement of the lever with respect to the support, a roller positioned in the plane of movement of the lever a predetermined distance from the end of the cutting blade when the lever abuts the stop, means for adjusting the position of the stop, and means for urging the lever toward the stop.

9. In a fixture for slitting jackets of rubber covered cables, an upright, a lever pivotally secured at one end thereof to the upright, means for limiting the pivotal movement of the lever with respect to the upright, a cutting blade, means for securing the blade to the free end of the lever for rotation about the transverse axis of the blade, means for limiting the rotation of the blade, and means positioned a predetermined distance from the end of the blade when the blade and the lever are in positions limited by the above mentioned limiting means for holding an article against the end of the blade.

10. In a fixture for slitting jackets of rubber covered cables, an upright, a lever pivotally secured at one end thereof to the upright for movement in a vertical plane, a lug having a tapped bore therethrough secured to the support, a calibrated set screw threaded into the tapped bore for limiting the upward movement of the lever, a spring for urging the lever upwardly, a pin rotatably secured to the free end of the lever, a cutting blade secured to the pin in such a manner that the ends of the blade project beyond the which the point of the blade is directed downwardly, a grooved roller rotatably secured to the upright in a vertical plane directly below the point of the blade for holding a cable against the blade, and a pair of guide rollers for maintaining the cable substantially perpendicular to the cutting blade when the point of the cutting blade is directed downwardly.

11. In a xture for slitting jackets of rubber covered cables, a support, an elongated cutting blade, means for mounting .the cutting blade pivotally on the support about an axis transverse to the blade, a stop, means for urging the blade toward the stop, and means spaced a predetermined distance from the cutting blade for holding a jacketed cable against the cutting blade, whereby the jacket of a cable drawn in one direction between the holding means and the cutting blade is cut by the cutting blade to a predetermined depth but is not cut when the cable is drawn therebetween in the opposite direction.

12. In a xture for slitting jackets of rubber covered cables, a support, an elongated cutting blade pivotally secured on the support for pivotal movement about an axis perpendicular to and intersecting the. longitudinal axis of the blade and provided with a cutting edge, a stop, means for yieldably urging the cutting blade toward the stop, and a roller spaced a predetermined distance from the cutting edge, whereby the jacket of a cable drawn in one direction between the cutting blade and the roller is cut to a predetermined depth but is not cut when the cable is drawn .therebetween in the opposite direction.

13. In a fixture for slitting jackets of rubber covered cables, a support, a cutting blade pivotally secured to the support, means for limiting the movement of the cutting blade in one direction, means for urging the cutting blade in the same direction, a roller spaced from the edge of the cutting blade, and means for selectively varying the distance between the edge of the cutting Iblade and the roller, whereby the jacket of a cable drawn between the cutting blade and the roller is cut to a predetermined depth.

14. In a fixture for slitting jackets of rubber covered cables, an elongated cutting blade, means for mounting the cutting blade for pivotal movement about a transverse axis thereof, means for limiting in one direction the pivotal movement of the blade, and an abutment positioned near the blade for holding a cable against the blade.

l5. In a fixture for slitting jackets of rubber covered cables, an elongated cutting blade, means for mounting the cutting blade for rotation about an axis perpendicular to and intersecting the longitudinal axis thereof, a stop for limiting in one direction the rotation of the cutting blade, and a grooved roller mounted adjacent to the cutting blade for guiding a cable past the cutting blade.

16. In a fixture for slitting jackets of rubber covered cables, a cutting blade, means for mounting the cutting blade for rotation, means for limiting the rotation of the blade in one direction, and an abutment for holding a cable in a position in which the cutting blade can engage the cable.

r CARL V. LUNDEEN.

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