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

1978-06-06

1980-03-11

Staab, Lawrence J.

Tool driving or impacting

Impacting devices

With means to cause or control advance of hammer head

92 85R, B25D 900

Patent

active

041923910

ABSTRACT:
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.

REFERENCES:
patent: 3032998 (1962-05-01), Atkinson
patent: 3884127 (1975-05-01), Simmons

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