Motors: expansible chamber type – Cyclically operable – Working member controlled motive fluid for distributor motor
Patent
1985-01-02
1987-01-13
Hershkovitz, Abraham
Motors: expansible chamber type
Cyclically operable
Working member controlled motive fluid for distributor motor
91319, 91321, F01L 2502
Patent
active
046355316
ABSTRACT:
A hydraulically operated impacting device includes a differential piston slidably disposed in a bore, and having an impacting surface and a piston rod facing at the other end a valve sleeve circumscribing the piston rod, there being an annular space between the rod and the valve, the valve having a first and a second position; a first duct leads from a pressure source to the bore and is governed by the valve for acting or not acting on the larger one of the two piston surfaces respectively in the first and second positions of the valve; a second duct leads from the source to the bore for acting on the smaller one of the piston surfaces; a third duct leads from the bore at a location below the valve to a ring chamber adjacent the valve, the valve having a collar which is movable in the ring chamber, the piston has a portion which depending on the position of the piston permits or prevents communication between the annular space and the third duct to obtain or not obtain pressurization of the ring chamber for shifting the valve from the first to the second position; the piston has a collar which may enter in part the annular space during a return stroke of the piston while the remainder of the collar and the bore establish a closed chamber so that upon continuation of the return stroke the piston shifts the valve from the second position into the first position in which the valve opens the first duct for obtaining a forward and impacting stroke.
REFERENCES:
patent: 3411592 (1968-11-01), Montabert
patent: 3986567 (1976-10-01), Pototsky
patent: 4011795 (1977-03-01), Barthe
patent: 4022108 (1977-05-01), Juvonen
patent: 4028995 (1977-06-01), Salmi
patent: 4084486 (1978-04-01), Juvonen
patent: 4142447 (1979-03-01), Krasnoff
patent: 4143585 (1979-03-01), Selsam
patent: 4165788 (1979-08-01), Montabert
Hershkovitz Abraham
Mannesmann AG
Siegemund Ralf H.
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