Thermal switch with organic-glass bead mixture sensing pellet

Details Thermal switch with organic-glass bead mixture sensing pellet Thermal switch with organic-glass bead mixture sensing pellet

1978-09-07

1980-06-17

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With fusible, combustible or explosive material

337401, H01H 3776

Patent

active

042086477

ABSTRACT:
A thermal switch for automatically opening a circuit when the ambient temperature exceeds a predetermined level is disclosed which utilizes a sensing pellet formed of an organic-glass bead mixture. The organic-glass bead pellet retains a pair of leads in contact with each other when the ambient temperature is below the melting temperature of the organic material. The addition of the glass beads to the temperature sensing pellet allows the compressive strength that is needed to hold the leads together to be more reliably controlled. In the process of combining the organic material and the glass beads, to form the pellet, the organic material is first melted so as to flow around the beads. Manufacture of the thermal-sensing pellet in this manner eliminates the voids which occur in the pressed organic pellets that are conventionally used in thermal sensing devices. The elimination of these voids increases the strength of the otherwise relatively fragile pellet thereby improving reliability of thermal switches which utilize the improved pellet of the present invention.

REFERENCES:
patent: 4065741 (1977-12-01), Sakamoto et al.
patent: 4112576 (1978-09-01), Gross
patent: 4135176 (1979-01-01), McVey et al.

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