Piston for a hammer drill having a separable part

Details Piston for a hammer drill having a separable part Piston for a hammer drill having a separable part

B - Operations, Transporting

25

D

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B25D 9/04 (2006.01) B25D 16/00 (2006.01) B25D 17/06 (2006.01) E21B 1/00 (2006.01)

Patent

CA 1110935

ABSTRACT OF THE DISCLOSURE In a hammer drill a pair of pistons are spaced axially apart within a bore forming an air cushion between them. As the rear piston is reciprocated the other piston is also reciprocated and strikes against a drilling tool. The rear piston consists of a hollow cylinder with a headpiece forming an airtight closure across its end surface facing toward the other piston. The headpiece of the rear piston has a part which separates from the remainder of the headpiece when it is struck by the other piston affording communication between the air cushion and the interior of the hollow cylinder.

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