Thermal protector
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorKensaku Ueda
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Abstract
A thermal protector of the type comprising a stationary electrode, a movable electrode having a heat responsive element which is disposed in opposite relationship with the stationary electrode, a block of a thermistor with a positive thermal coefficient and having two axial through holes, and electrically conductive sleeves which are partially inserted into or fully extended through the holes of the block, the stationary and movable electrodes being extended through sleeves. The thermal protector can precisely operate at a predetermined temperature and exhibit high resistance to vibration so that it is highly reliable and dependable in operation.
Claims6
A thermal protector which comprises:
- a heat responsive resistor, with a positive thermal coefficient, having two holes extending therethrough, two electrically conductive sleeves inserted into said holes in intimate contact with said heat responsive resistor, a stationary electrode having a lead extending through one of said sleeves in intimate contact with said sleeve, a movable electrode having a heat responsive element disposed in opposed relationship to said stationary electrode and adapted to move away from said stationary electrode and open contact between said electrodes when the enviromental temperature reaches a predetermined level, said movable electrode having a lead extending through said second sleeve in intimate contact with said second sleeve, said electrodes and heat responsive resistor being disposed within an air tight sealed envelope having the leads extending therefrom.
Dependencies are inferred from the claim text.