Positioning device using negative spring-rate tensioning means

Details Positioning device using negative spring-rate tensioning means Positioning device using negative spring-rate tensioning means

1975-09-15

1977-04-12

Ostrager, Allen M.

Power plants

Motor operated by expansion and/or contraction of a unit of...

Mass is a solid

F03G 706

Patent

active

040167216

ABSTRACT:
A positioning device for controlling a member such as a pen of a chart recorder, wherein the positioning motion is produced by a wire formed of temperature-responsive material (Nitinol) exhibiting a martensitic transformation which contracts the wire when its temperature is increased within a predetermined temperature range, and relaxes the wire when cooled within that range. The wire is maintained under tension by a spring having a negative spring-rate. This spring cooperates with internally generated forces and the elasticity of the wire material to produce contraction/expansion length changes of the wire in response to changes in its temperature. Electrical circuitry for controlling the wire temperature is disclosed, and includes means for inductively developing a frequency-modulated pulse-current through the wire.

REFERENCES:
patent: 2787118 (1957-04-01), Markham
patent: 3625002 (1971-12-01), Davis
patent: 3691499 (1972-09-01), Tyler

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