Thermostat controlled probe-type plug having a stopping member t

Details Thermostat controlled probe-type plug having a stopping member t Thermostat controlled probe-type plug having a stopping member t

1996-05-21

1997-12-16

Picard, Leo P.

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With longitudinally expansible solid element

337348, H01H 3748

Patent

active

056990340

ABSTRACT:
A thermostat controlled probe-type plug includes a heat detecting probe made from dual-metal. This heat detecting probe has a hollow tube and a metal rod is disposed therein. A swing arm is disposed at the open end of the hollow tube. The outer end of the metal rod is fixed to the swing arm at a suitable position. A fixing arm is disposed above the hollow tube. An elastic plate switch is disposed under the fixing arm. This elastic plate switch includes a first elastic plate and a second elastic plate. The end portion of the first elastic plate is above the end portion of the fixing arm. A biasing rod is disposed on the fixing arm and a knob is attached to the other end of the biasing rod. The biasing rod is pressed against onto the elastic plate switch. By screwing down the knob, the biasing rod can press down the second elastic plate to close or open the switch. At least one stopping post is provided at the bottom of the casing. The stopping post is located below the first elastic plate of the switch. By this arrangement, the first elastic plate will not move down under extremely low temperatures as it is blocked by the stopping post. The switch is therefore kept from becoming closed.

REFERENCES:
patent: 5270799 (1993-12-01), Rose

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