Automatic takeup and overload protection device for shape memory

Details Automatic takeup and overload protection device for shape memory Automatic takeup and overload protection device for shape memory

1985-02-21

1986-01-28

Feinberg, Craig R.

Illumination

Light source and modifier

Adjustable or repositionable modifier

362325, 337140, 60527, F03G 706, H01H 6104

Patent

active

045675490

ABSTRACT:
A device to provide overload protection for a shape memory metal (SMM) wire of an SMM-type actuator and to automatically compensate for cyclic creep and maintain the tension of the SMM wire. During normal operation, a restraining drum, in cooperation with a biasing spring, maintains the position of one end of the SMM wire so that the other end of the SMM wire can move an actuator. Under excessive loads, the restraining drum permits the first end of the SMM wire to move, thereby reducing the tension and preventing damage to the SMM actuator. When the excessive load is removed, the restraining drum permits the first end of the SMM wire to move under the influence of the biasing spring to its original position. By permitting the first end of the SMM wire to move in dependence upon the tension on the SMM wire, the device automatically takes up any slack caused by cyclic creep and maintains proper tension of the SMM wire.

REFERENCES:
patent: 1591754 (1926-07-01), Gates
patent: 2846543 (1956-08-01), Sivacek
patent: 3922591 (1975-11-01), Olsen
patent: 4246754 (1981-01-01), Wayman
patent: 4275561 (1981-06-01), Wang
patent: 4305250 (1981-12-01), Cory
patent: 4490975 (1985-01-01), Yaeger et al.
patent: 4524343 (1985-06-01), Morgan et al.

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