Indicator for monitoring linear activator position

Details Indicator for monitoring linear activator position Indicator for monitoring linear activator position

1989-03-24

1990-02-13

Noland, Tom

Measuring and testing

Testing of apparatus

74 8921, G01M 1900, G01B 500

Patent

active

048996025

ABSTRACT:
The present invention relates to an indicator for monitoring the position of a piston rod of a linear actuator utilized in robotic mechanisms. The indicator includes a precision toothed chain which is pulled by an extending piston rod and drawn in by a coil spring to maintain tension in the chain and a non-slipping relation with a sprocket wheel driven by the chain. A shaft encoder mounted on a shaft of the sprocket wheel delivers digitized quantities representative of the degree of rotation of the shaft and sprocket wheel and of the linear position of an actuating, linearly-movable end of the piston rod.

REFERENCES:
patent: 3785214 (1974-01-01), Ridley
patent: 3913766 (1975-10-01), Wentz
patent: 4516212 (1985-05-01), Nagashima
patent: 4531885 (1985-07-01), Molaug
patent: 4688985 (1987-08-01), Hartman
patent: 4768391 (1988-09-01), Hayes
patent: 4828474 (1989-05-01), Ballantyne

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