Rotary actuator

Details Rotary actuator Rotary actuator

1986-11-30

1989-01-03

Garrett, Robert E.

Expansible chamber devices

With toothed gear, spline or thread rigid with working member

92116, 92137, 92 98D, 92 98R, 403225, 251 58, 251 60, 248667, 248664, 74109, 74411, F01B 900

Patent

active

047948477

ABSTRACT:
A rotary actuator for a damper shaft controls the angular position of the damper shaft in accordance with variations in fluid pressure inside of the actuator. The actuator includes a housing, a flexible diaphragm within the housing separating it into a fluid-tight compartment and a second compartment open to the atmosphere. The fluid-tight compartment is provided with a fluid pressure receving port open to a control source of variable pressure. The piston and piston rod are slidably mounted in the second compartment in contact with the diaphragm. The piston rod includes a longitudinally extending rack, and a crank arm rotatably mounted in the housing has a gear segment in meshing relationship with the rack. The actuator shaft to be controlled extends through the housing and is mounted in the crank arm to support the rotary actuator, and the rotary actuator is clipped to an air conditioning duct to prevent it from rotating on the damper actuator shaft axis.

REFERENCES:
patent: 2728593 (1955-12-01), Hutton
patent: 2978116 (1961-04-01), Wells et al.
patent: 3146594 (1964-09-01), Allen
patent: 3175110 (1965-03-01), Kohlhagen
patent: 3985151 (1976-10-01), Smith
patent: 4158511 (1979-06-01), Herbenar

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