Device for controlling the retraction of a mobile structure

Details Device for controlling the retraction of a mobile structure Device for controlling the retraction of a mobile structure

1996-04-05

1998-03-03

Lorence, Richard M.

Motors: spring, weight, or animal powered

Spring

With winding means

192 662, 192 82T, 192101, B64G 166

Patent

active

057225109

ABSTRACT:
A unit for controlling the retraction of a mobile structure such as a mirror used for calibrating an optical system on board a spacecraft, which includes a spring which permanently forces the mobile structure towards its retracted position and a memory material member, wherein a change of state of the memory material disconnects a connecting system placed in a transmission mechanism normally connecting a control motor to the mobile structure. The connecting system normally ensures the joining by friction of two parts of the transmission mechanism between which the spring acts. A heating system controls the change of state of the memory material member.

REFERENCES:
patent: 4086991 (1978-05-01), Swadley
patent: 5103949 (1992-04-01), Vanderzyden et al.

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