Expansible chamber devices – Oscillating working member or cylinder therefor
Patent
1989-12-18
1991-04-16
Kwon, John T.
Expansible chamber devices
Oscillating working member or cylinder therefor
92137, 92130R, 92130C, 92177, 277217, 277138, 277174, 277176, 277177, 277207R, F01C 900
Patent
active
050073303
ABSTRACT:
A rotary actuator comprising a housing which defines an arcuate chamber, the housing including a first monolithic portion in which the arcuate chamber is completely contained, a piston disposed in the housing for reciprocable movement in the arcuate chamber, a shaft journaled in the housing and connected to the piston and being rotated in response to movement of the piston, a floating seal assembly carried by one of the piston or the housing for effecting sealing between the piston and the housing, a fluid pressure port to introduce fluid into the housing to effect movement of the piston in the first direction and a means such as fluid pressure or a spring return to effect movement of the piston in an opposite second direction, the actuator in one preferred embodiment employing a spring return which provides a substantially constant torque acting upon the shaft as the spring moves from a compressed first position to an uncompressed second position such that the torque acting upon the shaft in both rotational directions is substantially constant.
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"Zero-Gradient Spring System", Sanford W. Groesberg, Machine Design, Jan. 21, 1960, pp. 143-147.
Frenzel Robert A.
Scobie William B.
Denion Thomas
Keystone International Holdings Corp.
Kwon John T.
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