Fluid-operated striker assembly with automatic stroke length var

Details Fluid-operated striker assembly with automatic stroke length var Fluid-operated striker assembly with automatic stroke length var

1997-08-29

1999-01-19

Moon, Daniel B.

Tool driving or impacting

Impacting devices

Hammer head constitutes piston of drive motor

173 17, B25D 1600

Patent

active

058604812

ABSTRACT:
A fluid-operated striker assembly includes a working cylinder and a striker piston slidably received in the working cylinder for executing working (forward) and return strokes. The striker piston delivers a blow to a tool bit during the working stroke when the striker piston is either in a limit position or in an advanced position which is beyond the limit position in the direction of the working stroke. A control arrangement applies an alternating fluid pressure to the striker piston to execute the working and return strokes. Further, a precontrol arrangement is provided for affecting the control arrangement dependent on whether the striker piston has exceeded its limit position. The precontrol arrangement causes the control arrangement to operate the striker piston with a normal working stroke as long as the striker piston delivers a blow to the tool bit in the limit position, and causes the control arrangement to operate the striker piston with a short working stroke--whose length is less than that of the normal working stroke--as long as the striker piston delivers a blow to the tool bit in the advanced position.

REFERENCES:
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patent: 3880244 (1975-04-01), Boom et al.
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patent: 5064005 (1991-11-01), Krone
patent: 5529132 (1996-06-01), Evarts
patent: 5653295 (1997-08-01), Juvonen et al.

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