Motors: expansible chamber type – Cyclically operable – Relatively movable inlet and exhaust valves
Patent
1986-11-14
1989-02-07
Garrett, Robert E.
Motors: expansible chamber type
Cyclically operable
Relatively movable inlet and exhaust valves
91442, 91452, 91468, 92 86, F01B 300
Patent
active
048024023
ABSTRACT:
A work cylinder having an internally-disposed, automatically-operated drain valve disposed in one or both ends of a housing having a cylinder bore formed therein. A reciprocally-movable piston divides the bore into first and second pressure chambers. A drain chamber formed in one or both ends has a movable plunger member disposed therein. A first passageway allows fluid from the pressure chamber to act on one surface of the plunger. A pilot valve is partially formed on a bottom portion of the plunger and opens when fluid pressure is exhausted from the adjacent pressure chamber. A bias spring acts on the plunger to prevent closing of the drain valve upon initial pressurization of the adjacent chamber. This initial pressurization assists in purging additional moisture from the chamber until a threshold level is exceeded to close the drain valve.
REFERENCES:
patent: 562039 (1896-06-01), Schmidt
patent: 650263 (1900-05-01), Morrow
patent: 1020861 (1912-03-01), Walraven
patent: 1228555 (1917-06-01), Hansen
patent: 1439854 (1922-12-01), Vincent
patent: 1574103 (1926-02-01), Michael
patent: 1652879 (1927-12-01), Standerwick
patent: 3442290 (1969-05-01), Phillips
American Standard Inc.
Baier G. P.
Denion Thomas
Garrett Robert E.
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