Pneumatic ground piercing tool with movable chisel head

Details Pneumatic ground piercing tool with movable chisel head Pneumatic ground piercing tool with movable chisel head

E - Fixed Constructions

21

B

E21B 4/06 (2006.01) E21B 1/00 (2006.01) E21B 4/14 (2006.01) E21B 7/26 (2006.01) E21B 10/40 (2006.01)

Patent

CA 2331700

A ground piercing tool has an elongated tubular tool housing and a striker that reciprocates within an internal chamber of the housing. The striker impacts a front impact surface and drives the tool through the ground. An air distributing mechanism causes the striker to reciprocate in response to a supply of compressed fluid. An anvil providing a front impact surface is disposed in a front end opening of the tool housing. The anvil has a rear frustoconical portion that engages a like-shaped forwardly tapering inner wall of the housing and a lengthwise bore that has an enlarged diameter portion. A chisel is slidably disposed in the bore of the anvil and has an outwardly opening annular groove. A spring is confined in compression in a space defined by the annular groove of the chisel and the enlarged diameter portion of the anvil bore. The spring urges the rear end of the chisel to protrude rearwardly from the bore of the anvil a predetermined distance. The spring compresses as the striker delivers an impact to the chisel and moves the chisel forward until the striker contacts a rear end of the anvil.

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