Rotary actuator and method for forming a rotary piston

Details Rotary actuator and method for forming a rotary piston Rotary actuator and method for forming a rotary piston

1990-03-20

1991-09-03

Look, Edward K.

Expansible chamber devices

Oscillating working member or cylinder therefor

921701, 92248, 2988847, 264269, 264310, F01C 900, F01B 1102, B28B 102

Patent

active

050442570

ABSTRACT:
Improved techniques are provided for manufacturing a toroidal arc segment piston for use in a fluid pressure responsive rotary actuator, and for forming an actuator housing defining an arcuate chamber for receiving a rotary actuator piston. A moldable polymeric material is positioned within an arcuate master chamber in a piston-forming fixture, and a metal piston core is rotatably mounted to the fixture. The piston core is rotated to displace the polymeric material and form a sheath about the piston core. After curing, the piston core and sheath are rotated out of the arcuate master chamber, and are installed in a rotary actuator housing. A master piston may similarly be used to form a polymeric lining which defines the chamber for receiving the piston in the actuator housing.

REFERENCES:
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patent: 3520969 (1970-07-01), Smith
patent: 4099659 (1978-07-01), Grimaldi, Jr.
patent: 4600548 (1986-07-01), Nenna
patent: 4628797 (1986-12-01), Kendall
patent: 4765938 (1988-08-01), Schmidt et al.

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