Hydraulic reciprocating machines

Details Hydraulic reciprocating machines Hydraulic reciprocating machines

1981-12-03

1984-05-29

Yost, Frank T.

Tool driving or impacting

Work cleansing

Cleansing fluid passage in impact transmitting anvil

91224, 173136, E21C 708, B25D 1716

Patent

active

044509200

ABSTRACT:
A reciprocating machine comprising a cylinder with a drive chamber and a return chamber; a piston arranged to move to and fro in the cylinder with a first piston area exposed to the drive chamber and being smaller than a second piston area exposed to the return chamber; a permanently open inlet for fluid to the drive chamber; a restricted outlet for fluid from the return chamber; a bore extending through the piston from a port in its first area to its second area; a first valve with a head adapted to seat on the port and a stem guided in the end wall of the drive chamber; and means for limiting the extent of travel of the first valve with the piston so that the first valve can travel with the piston only part of the way from the drive chamber toward the return chamber.

REFERENCES:
patent: 1096886 (1914-05-01), Bayles
patent: 3101796 (1963-08-01), Stall et al.
patent: 3130799 (1964-04-01), Williams
patent: 3236157 (1966-02-01), Lovell et al.
patent: 3480088 (1969-11-01), Ghelfi
patent: 3524385 (1970-08-01), Ottestad

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