Knife for stripping tubing from conductors enclosed therein

Details Knife for stripping tubing from conductors enclosed therein Knife for stripping tubing from conductors enclosed therein

1977-11-22

1979-03-27

Smith, Al Lawrence

Cutlery

Means for cutting elongate, strand-encircling sheath

With cutter-opposing, sheath-engaging surface pivotally...

30 907, 30161, B21F 1300

Patent

active

041458087

ABSTRACT:
A utility company lineman's knife is provided for cutting the tubing or sheath of multi-conductor cable. The knife has an elongated slotted handle which receives the cutting blade and in which the blade is pivotal into any one of three locked positions, namely, closed, opened to an intermediate position for circumferential cutting, and fully opened for longitudinal cutting. The locked positions are controlled by a spring-biased J-bolt the short leg of which is adapted to enter into any one of three detent holes in the blade. The tip of the knife is provided with a protective button which functions as a bearing surface against the inner wall of the tubing and allows outward tension to be applied to the knife blade to maintain the cutting edge away from the inner conductors, thereby to protect the interior conductors and insulation against accidental cutting. The handle of the knife is provided with an extension or guide saddle having a curved surface which bears against the cable and coacts with the knife blade and button to maintain outward tension on the knife and button as the knife is rolled about the cable during circumferential cutting.

REFERENCES:
patent: 2817255 (1957-12-01), Lormeau
patent: 2924879 (1960-02-01), Kraus
patent: 3116554 (1964-01-01), Davis
patent: 3162945 (1964-12-01), Stabs

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