Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With bimetallic element
Patent
1991-02-12
1992-06-09
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With bimetallic element
337354, 337380, 29622, H01H 3754, H01H 3704
Patent
active
051210959
ABSTRACT:
A thermal motor protector includes a cylindrical metal housing having an open end and a bimetal disposed in the housing so that its one side is opposite to an housing inner bottom. The bimetal has a shallow dish-shaped portion so that it inverts its curvature at a first temperature with a snap action and re-inverts its curvature at a second temperature. A support is disposed in the housing opposite to the other side of the bimetal and has a preselected elasticity. A fixed contact member is disposed in the housing, and a movable contact member is held by a stationary member in the housing so as to be movable relative to the fixed contact member. A pressure strip is formed separately from or integrally with the movable contact member so as to project from and to be moved with it, the pressure strip having a distal end in contact with the support so that a force is applied to the bimetal at a predetermined pressure. A header plate is secured to the housing so as to hermetically close the open end of the housing, the header plate having at least one opening, and a terminal pin is hermetically held in the header plate opening with an electrically insulating material charged between them.
REFERENCES:
patent: 4334210 (1982-06-01), Boulanger et al.
patent: 4970485 (1990-11-01), Wahls
Mizutani Yasukazu
Ubukata Susumu
Broome Harold
Ubukata Susumu
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