Hydraulic percussive machines

Details Hydraulic percussive machines Hydraulic percussive machines

1987-12-01

1989-08-01

Yost, Frank T.

Tool driving or impacting

Impacting devices

Impact transmitting anvil

91392, B23B 4516

Patent

active

048526630

ABSTRACT:
The present invention is directed to a hydraulic percussive machine with a shuttle valve to control the flow of fluid to and from a drive chamber without timing lands on the piston and a seal between the drive and return chambers. This is made possible by the use of a restrictive orifice connected to the shuttle valve and the port in the return chamber which is covered and uncovered by the piston. When the port is uncovered, the shuttle valve moves over under pressure. When the port is covered, pressure leaks away to the orifice so that the shuttle valve moves back again.

REFERENCES:
patent: 3701386 (1972-10-01), Feucht

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