Nitinol hookswitch actuator

Details Nitinol hookswitch actuator Nitinol hookswitch actuator

1997-08-22

1999-12-28

Zele, Krista

Telephonic communications

Terminal

Switch or switch actuator structure

379422, 379424, 379425, 379427, 379428, 379440, H04M 100

Patent

active

060091665

ABSTRACT:
A hookswitch actuator including an activating mechanism which maintains the hookswitch circuit of a telephone in an "on hook" state when the activating mechanism is in a first position, or in an "off hook" state when the activating mechanism is in the second position. The movement of the activating mechanism between the two positions is accomplished through the use of a shape memory alloy mechanism. The shape memory alloy mechanism is coupled to the activating mechanism in such a way that heating or cooling of the shape memory alloy mechanism moves the activating mechanism between its two positions. Control of the heating and cooling of the shape memory alloy mechanism is effectuated by controlling the amount of electric current passing through it.

REFERENCES:
patent: 4692940 (1987-09-01), Baines
patent: 4742542 (1988-05-01), Jantzi
patent: 4961033 (1990-10-01), Hirota
patent: 5033083 (1991-07-01), Gotfryd et al.
patent: 5590417 (1996-12-01), Rydbeck
patent: 5752672 (1998-05-01), McKillip, Jr.
patent: 5778061 (1998-07-01), Parment et al.

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