Automatic closing activator

Details Automatic closing activator Automatic closing activator

1986-02-19

1987-11-17

Jordan, M.

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Thermally released check or closer

16 78, 49379, E05F 1520

Patent

active

047063300

ABSTRACT:
This invention concerns a traction device such as a door closure made from memory alloy. In the preferred form the traction device comprises an elongated length of memory alloy, heating means operable to heat the element to restore it to its original shape, relatively movable parts attached to respective ends of the element, one of which is connected to a load which is to be displaced in the direction of traction when the element is heated, and a spring which yields resiliently to allow the load to move in the direction opposite to that in which traction is exerted if the element is hot.

REFERENCES:
patent: 1860333 (1932-05-01), Dunn
patent: 3143773 (1964-08-01), Glenn
patent: 3516082 (1970-06-01), Cooper
patent: 3883885 (1975-05-01), Orlando
patent: 4010455 (1977-03-01), Stange
patent: 4366595 (1983-01-01), Elliott
Johnson, Dr. A. D., Proceedings of the NITINOL Heat Engine Conference-"Training", Phenomena in NITINOL, Silver Spring, Md., Sep. 26-27, 1978.

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