Device in needle hammers

Details Device in needle hammers Device in needle hammers

1984-06-27

1986-08-12

Schran, Donald R.

Tool driving or impacting

Power paths to plural tools from single drive

Drive plural means to reciprocate hammer heads or tools

173 53, 173119, 29 81D, 279102, B21C 4300

Patent

active

046050736

ABSTRACT:
A device in pressure medium operated needle hammers, the needles (24) being arranged in a reciprocatingly movable working member (3) by at least one flexible holder member (31, 39) and, by a friction grip of the holder member being caused to follow the movements of the working member, but being permitted an axial play within predetermined limits through overcoming the frictional resistance. In addition, the rear portions of the needles can be arranged in a sealed chamber (34) filled with a hydraulic medium (35).

REFERENCES:
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patent: 2624102 (1953-01-01), Green
patent: 2672677 (1954-03-01), Von Arx
patent: 2779085 (1957-01-01), Schoengarth
patent: 2789653 (1957-04-01), Fannen
patent: 3023485 (1962-03-01), Barthod
patent: 3399441 (1968-09-01), Imamura
patent: 3680643 (1972-08-01), Cameron et al.
patent: 4158522 (1979-06-01), Wirfelt
patent: 4239143 (1980-12-01), Johnson
patent: 4343368 (1982-08-01), Fadeev et al.

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