Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – Expansible or vaporizable fluid actuated
Patent
1982-06-24
1984-12-25
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
Expansible or vaporizable fluid actuated
337117, 337317, 337319, H01H 3712, H01H 3738, H01H 3760
Patent
active
044907087
ABSTRACT:
A condition responsive electric switch system comprises switch means which includes at least one set of contact elements defining a preselected open position, a preselected closed position, and a preselected initial contact make-break position, disposed between the open and closed positions. Switch actuating means is movable in actuating relation with the switch means for operating the contact elements selectively into and out of the three preselected positions. Spring means and temperature responsive means are connected to and impart motion to switch actuating means, with the spring means and temperature responsive means creating opposing forces on the switch actuating means. The condition responsive electric switch system has both positive and negative spring gradients including a force producing means having maximum absolute positive gradient forces F.sub.1 and F.sub.2 in which F.sub.1 =maximum absolute positive gradient pre-load force on the contact elements at the preselected initial contact make-break position; F.sub.2 =maximum absolute positive gradient force on the contact elements at the preselected closed position wherein the value of the expression (F.sub.2 -F.sub.1)/F.sub.2 should not be substantially less than unity. A net contact element force is also produced generally in the vicinity of zero as the contact elements pass at least through the preselected initial contact make-break position. The system further includes means for adjusting the larger negative spring gradients in the system.
An electrical switch device and a method of operating the switching device are also disclosed.
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Kelly Ronald W.
Thompson Paige W.
Broome Harold
General Electric Company
Papin Joseph E.
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