Lockable striking mechanism for hammer drill

Details Lockable striking mechanism for hammer drill Lockable striking mechanism for hammer drill

1987-10-05

1989-01-17

Yost, Frank T.

Tool driving or impacting

Drive controlled by relative axial movement of tool

Reciprocating drive member connected to pulsing fluid column

173116, B25D 1706

Patent

active

047982497

ABSTRACT:
In a hammer drill, a striking mechanism supplied percussive force to a tool. The striking mechanism includes a free piston slidably displaceable in a reciprocating manner within a guide cylinder. Balls mounted in the guide cylinder are spring biased into a recess in the free piston for securing the piston in a locked position so that it cannot deliver percussive force to the tool. The balls are spring biased by a ring encircling the cylinder with a spring pressing the ring in the axial direction of the cylinder against the balls.

REFERENCES:
patent: 3841418 (1974-10-01), Biersack
patent: 4284148 (1981-08-01), Wanner et al.
patent: 4442906 (1984-04-01), Simpson

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