Hydraulic percussive machines

Details Hydraulic percussive machines Hydraulic percussive machines

1977-03-09

1978-11-21

Hafer, Robert A.

Tool driving or impacting

Impacting devices

With means for rotating tool

173 13, B25D 900

Patent

active

041261925

ABSTRACT:
A hydraulic percussive machine comprising a cylinder, a piston reciprocable up and down in the cylinder, an inlet for hydraulic fluid to the machine, an outlet for hydraulic fluid from the machine, valve and timing means for controlling the operation of the piston, a chuck for holding a tool, a mechanism for rotating the chuck, a cushioning flange on the piston, a dashpot space in the cylinder adapted to be entered by the flange on overtravel of the piston on its downstroke, and a first connection for feeding fluid trapped under pressure in the dashpot space to the chuck driving mechanism as a motive for that means.

REFERENCES:
patent: 3307638 (1967-03-01), Kurt
patent: 3741316 (1973-06-01), Alajouanine
patent: 3866690 (1975-02-01), Lance et al.
patent: 4006783 (1977-02-01), Granholm

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