Thermostatically controlled switch

Details Thermostatically controlled switch Thermostatically controlled switch

1993-09-21

1994-05-24

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

Expansible or vaporizable fluid actuated

337312, 337323, H01H 3712, H01H 3736

Patent

active

053152816

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 control spring portion (48) causing contacts (46, 52) to open. When the temperature of the bulb reaches the temperature set by the calibration plate, the control spring portion flexes opening the contacts. To reset the switch and close the contacts, a reset member (92) is depressed. A coil spring (94) limits the reset pressure such that the switch can only be reset or closed when the sensed temperature drops sufficiently. An emergency shut off member (100) engages the spring blade member (44) directly opening the contacts without regard to the sensed temperature. In a fixed temperature embodiment (FIG. 5), a pivot member (110) defines the flex point of spring blade member to determine whether the switch works in a snap acting mode or a slow make/break mode.

REFERENCES:
patent: 3114813 (1963-12-01), Durst
patent: 3226512 (1965-12-01), Durst et al.
patent: 4510480 (1985-04-01), Rossi et al.
patent: 4626819 (1986-12-01), Drapeau
patent: 5101189 (1992-03-01), Dolza et al.

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