Hydraulically operated percussion hammer

Details Hydraulically operated percussion hammer Hydraulically operated percussion hammer

1997-07-15

1999-11-09

Ryznic, John E.

Motors: expansible chamber type

Cyclically operable

Multiple exhaust passages

91243, 91321, 91274, F01L 1500, F01L 2102, F01B 718

Patent

active

059792914

ABSTRACT:
A hydraulically operated percussion hammer comprising a percussion piston that reciprocates by means of the pressure of the pressure fluid, a main valve that is controlled by the position of the percussion piston and that guides the pressure fluid to the percussion piston in order to provide a reciprocating motion, and a pressure control valve that is placed in an outlet duct for pressure fluid and that prevents the flow of the pressure fluid from the percussion apparatus before the pressure of the pressure fluid in the inlet duct exceeds the set value of the pressure control valve. The percussion apparatus comprises a separate by-pass duct which allows the pressure fluid to flow from the pressure chamber of the percussion piston past the pressure control valve to the outlet duct until the percussion piston has reached a certain point during its return motion.

REFERENCES:
patent: 3774502 (1973-11-01), Arndt
patent: 3965799 (1976-06-01), Juvonen et al.
patent: 4020746 (1977-05-01), Arndt
patent: 4291771 (1981-09-01), Perraud
patent: 4800797 (1989-01-01), Comarmond
patent: 4899836 (1990-02-01), Venot

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