Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – With longitudinally expansible solid element
Patent
1973-04-16
1976-05-25
Goldberg, Gerald
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
With longitudinally expansible solid element
337389, 337388, H02H 708
Patent
active
039596915
ABSTRACT:
The disclosure relates to a manual reset motor protector device having an arm of a nickel-titanium metal alloy or the like supporting an electrical contact and having a spring arm supporting a second electrical contact, both of these arms being mounted on a device housing. A manual reset member is slidable on the housing for deforming the arm of the noted nickel-titanium metal alloy from an original configuration to a second configuration while the nickel-titanium alloy is below a predetermined transition temperature, whereby the device contacts are normally engaged to close a device circuit. When the device is mounted on a motor for protecting the motor against over-temperature conditions, electrical current is normally directed through the device circuit. However, when an over-temperature condition occurs in the device so that the initially deformed arm of the nickel-titanium alloy is heated above its transition temperature, the arm returns abruptly to its original configuration and moves away from the spring arm to open the device circuit. The reset member has portions arranged to engage the nickel-titanium alloy arm and the spring arm of the device separately as the reset member is moved to deform the nickel-titanium alloy arm. As a result, sliding movement of the reset member does not close the device contacts as the reset member is moved for deforming the nickel-titanium alloy arm. Accordingly, if the over-temperature condition in the device is continuing when the reset member is moved, the nickel-titanium alloy arm is not permanently deformed by movement of the reset member and returns to its original configuration on release of the reset member from its resetting position. The device circuit therefore remains open.
REFERENCES:
patent: 2262205 (1941-11-01), Schachtner
patent: 2510021 (1950-05-01), Kaminky
patent: 3403238 (1968-09-01), Buehler et al.
patent: 3555479 (1971-01-01), Polkinghorn
patent: 3594674 (1971-07-01), Willson
patent: 3634803 (1972-01-01), Willson
Baumann Russell E.
Goldberg Gerald
Haug John A.
McAndrews James P.
Salce Patrick R.
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