Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – Expansible or vaporizable fluid actuated
Patent
1975-07-16
1977-10-25
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
Expansible or vaporizable fluid actuated
337309, H01H 3776
Patent
active
040558282
ABSTRACT:
A control device having a housing carrying a condition responsive unit and an electrical switch to be operated by the condition responsive unit, the housing having a pivotally mounted lever to translate motion from a movable wall of the condition responsive unit to the switch and having a range spring to oppose movement of the movable wall in one direction thereof. An actuator is dispoed between the movable wall of the condition responsive unit and the range spring and is engagable therewith, the actuator being unitary between the movable wall and the range spring and carrying a pin that is operatively associated with the lever to cause pivoting movement of the lever as the actuator is moved relative to the housing. A push rod unit translates motion between the lever and the switch, the push rod unit having a pivot bearing arrangement therein to compensate for different pivot movements of the lever and the switch. A spring is carried by the housing and is operatively associated with the lever to lower the differential of the control without imposing force on the pivot point of the lever.
REFERENCES:
patent: 2216589 (1940-10-01), Grooms
patent: 2889432 (1959-06-01), Miller
Broome Harold
Robertshaw Controls Company
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