Motors: expansible chamber type – Working member position responsive motive fluid control – Exhaust control
Patent
1977-02-28
1979-09-11
Cohen, Irwin C.
Motors: expansible chamber type
Working member position responsive motive fluid control
Exhaust control
91409, 92 85B, 92128, 92163, F01B 1102, F15B 1522
Patent
active
041671341
ABSTRACT:
A compact, double-acting piston-type fluid activated device having an axially reciprocable piston for controlled, predetermined deceleration of the piston as it approaches the limit at each end of its travel within a cylindrical bore. The cylindrical bore is sealed at each end by end walls removably retained in the bore. Each end wall is provided with a central counterbore in its inner surface which in cooperation with the piston provides a cushioning chamber. The area of the counterbore central surface is critically related to the circular cross-sectional area of the cylindrical bore in which the end wall is to be secured, being in the range from about 60% to about 85% thereof. A vent passage places the cushioning chamber in preselectedly restricted flow communication with porting means in the wall of the device, each port being located intermediate the end walls. A method is provided for removably circumferentially locking each end wall in the operating cylinder with a wire snap ring having a hooked end. The method allows the end walls to be secured within, and later removed from a heavy-walled device.
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Cohen Irwin C.
Lobo Alfred D.
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