Control device

Details Control device Control device

1985-10-11

1987-02-10

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With longitudinally expansible solid element

337393, 337394, H01H 3776

Patent

active

046425993

ABSTRACT:
A control device having a control element that can be actuated by a thermostatic working element has a multipart structure which includes a primary housing which is preferably made of plastic and a secondary housing which is preferably made of metal. The primary housing is generally U-shaped in cross-section and is provided with an exterior shoulder. The secondary housing is also U-shaped and is provided with an edge which is plastically deformed around the shoulder of the primary housing to secure the housings together. A movable working element extends through a wall of the primary housing and contacts the control element. The secondary housing includes a chamber for receiving a thermally expandable material which is positioned adjacent to an end of the working element. An elastic membrane is disposed between the expandable material and the working element and is secured in position by the primary and secondary housings.

REFERENCES:
patent: 3515368 (1970-06-01), Kelly
patent: 4225841 (1980-09-01), Saur et al.
patent: 4389629 (1983-06-01), Saur et al.

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