Electric heating – Heating devices – With power supply and voltage or current regulation or...
Reexamination Certificate
2005-05-17
2005-05-17
Paschall, Mark (Department: 3742)
Electric heating
Heating devices
With power supply and voltage or current regulation or...
C219S491000, C219S496000, C219S513000, C219S494000
Reexamination Certificate
active
06894253
ABSTRACT:
A control unit (3) for controlling an electric household appliance, e.g. a refrigerator, is connected in series with a positive temperature coefficient (PTC) resistive unit (4) which, when supplied with electric current, generates sufficient heat to activate a thermally activated actuating element (6) for selectively turning on/off respective auxiliary switches (9) of the electric household appliance. The thermally activated actuating element (6) includes a temperature-deformable element (7), e.g. a bimetallic plate, the deformation of which is transmitted by kinematic links (10) to a camshaft (8), the cams (12) of which cooperate with the auxiliary switches (9) of the electric household appliance to selectively turn on/off the auxiliary switches (9).
REFERENCES:
patent: 1959659 (1934-05-01), Colbie
patent: 2970454 (1961-02-01), Everard et al.
patent: 3202842 (1965-08-01), Sherwood
patent: 3688060 (1972-08-01), Risk
patent: 3902151 (1975-08-01), Hall et al.
patent: 0 234 189 (1987-09-01), None
patent: 1 225 302 (1971-03-01), None
ITW Industrial Components S.r.l.
Lowe Hauptman & Gilman & Berner LLP
Paschall Mark
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