Motors: expansible chamber type – Miscellaneous
Patent
1978-02-02
1980-09-16
Hershkovitz, Abraham
Motors: expansible chamber type
Miscellaneous
91165, 91465, F01B 2502
Patent
active
042223091
ABSTRACT:
A method of operating an hydraulic power system having a piston with opposing piston heads reciprocally mounted in opposing piston chambers, the piston being directionally responsive to a pair of control valves adapted to be sequentially opened and closed to actuate the piston for movement in opposite directions. The control valves each having a series of sequentially acting valve elements which control fluid flow to and from the piston, a condition being established in which the piston is at one end of its stroke and a first of the piston heads is under relatively high pressure and the other under relatively nominal pressure, the piston being driven to the opposite end of its stroke by first relieving the high pressure on the first of the piston heads to a nominal level and thereafter rapidly increasing the fluid pressure on the other of the piston heads, the piston and control valves working at all times against solid columns of fluid under controlled positive pressures.
REFERENCES:
patent: 1353656 (1920-09-01), Heisler
patent: 2672731 (1954-03-01), Ashton
patent: 2954794 (1960-10-01), Paine
patent: 3200713 (1965-08-01), Viersma
patent: 3260164 (1966-07-01), Guentner
patent: 3370513 (1968-02-01), Shore
patent: 3444784 (1969-05-01), Wengerd
patent: 3608431 (1971-09-01), Pease
patent: 3645167 (1972-02-01), Espenschied
patent: 3834276 (1974-09-01), Gournelle
patent: 4003547 (1977-01-01), Snyder
patent: 4011795 (1977-03-01), Barthe
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