Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – Expansible or vaporizable fluid actuated
Patent
1992-02-25
1992-12-22
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
Expansible or vaporizable fluid actuated
337312, 337319, 200 83S, H01H 3736, H01H 3712
Patent
active
051736799
ABSTRACT:
A housing (10), (54) defines a well which holds a diaphragm assembly (12). The diaphragm assembly has a stud portion (14) that extends through an aperture in the housing and is biased into the housing by a spring (16). The stud portion defines a channel (18) which is received in a slot between arms of a calibration plate (20). Movement of the calibration plate transverse to the axis of the stud portion engages a cam surface (24) to position the diaphragm, more particularly a dielectric button (34) which engages a switch control member (50). As a fluid in a bulb (32) expands, it causes the diaphragm to expand, moving the control member (50) and one end of spring portion (48) causing contacts (46, 52) to open. The temperature or degree of diaphragm extension at which the switch contacts open is adjusted by rotating a shaft (60). As the stem is rotated, a cam follower (76) and cam (70) interact causing a dielectric actuator (64 ) to change the bias force, hence pivot point, of spring elements (44).
REFERENCES:
patent: 3114813 (1963-02-01), Durst
patent: 3226512 (1965-12-01), Durst et al.
patent: 4626819 (1986-12-01), Drapeau
patent: 5101189 (1992-03-01), Dolza et al.
Broome Harold
Sensors & Switches, Inc.
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