Low shock release device

Details Low shock release device Low shock release device

1996-01-22

1998-02-17

Dorner, Kenneth J.

Joints and connections

Utilizing thermal characteristic, e.g., expansion or...

294 8226, 294 991, 2941031, 2941191, 403 32, 403404, F16B 400, C22K 100

Patent

active

057185310

ABSTRACT:
A release device is actuated to release a workpiece by operation of either of two elongated shape memory metal alloy (SMMA) members. Each SMMA member has on one end a feature that engages a fitting on the workpiece, while its other end is mounted to a housing. A heater on each SMMA member raises its temperature to a transition temperature at which it returns to an unstressed (e.g. shorter) length, thereby releasing the workpiece. The two SMMA elements may be disposed in opposite directions from the housing or may be coaxial or offset and disposed in the same direction.

REFERENCES:
patent: 2161082 (1939-06-01), Ovtschinnikoff
patent: 3034289 (1962-05-01), Stott et al.
patent: 4173366 (1979-11-01), Mattei et al.
patent: 4553393 (1985-11-01), Ruoff
patent: 4753465 (1988-06-01), Dalby
patent: 5248233 (1993-09-01), Webster
patent: 5312152 (1994-05-01), Woebkenberg, Jr. et al.
patent: 5344506 (1994-09-01), DeAngelis
"SP Series Pin Pullers," Hi-Shear Corporation Data Sheet, 1976.

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