Switch for water boiling appliance such as a kettle
First Claim
1. A steam-responsive switch for use in an electrical water boiling appliance comprising a main body from which extends a tubular portion having at or near its leading end a heat responsive member extending across the mouth thereof which changes shape above a predetermined temperature defining a chamber behind the member and at the opposite face of the main body an electrical contact pair, the heat responsive member engaging on its rear face a slidable actuating member which extends through the main body in a sealed manner to act on the electrical contact pair, the tubular portion having a vent at one side thereof adjacent the rear face of the heat responsive member opening laterally into the chamber facing across the heat responsive member, for the egress of steam and for the ingress of cool air.
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Accused Products
Abstract
A steam-responsive switch for use in an electrical water boiling appliance comprises a main body (12) from which extends a tubular portion (13) having at or near its leading end a heat responsive bimetal (16) extending across the mouth thereof which changes shape above a predetermined temperature defining a chamber behind the member and at the opposite face of the main body (12) an electrical contact pair, the bimetal (16) engaging on its rear face a slidable pushrod (20) which extends through the main body (12) in a sealed manner to act on the electrical contact pair, the tubular portion having a steam/air vent (64) at one side thereof adjacent the rear face of the bimetal (16).
21 Citations
43 Claims
- 1. A steam-responsive switch for use in an electrical water boiling appliance comprising a main body from which extends a tubular portion having at or near its leading end a heat responsive member extending across the mouth thereof which changes shape above a predetermined temperature defining a chamber behind the member and at the opposite face of the main body an electrical contact pair, the heat responsive member engaging on its rear face a slidable actuating member which extends through the main body in a sealed manner to act on the electrical contact pair, the tubular portion having a vent at one side thereof adjacent the rear face of the heat responsive member opening laterally into the chamber facing across the heat responsive member, for the egress of steam and for the ingress of cool air.
- 12. A steam-responsive switch for a water boiling appliance comprising forwardly-facing tubular portion of circular section having a heat responsive member arranged to extend laterally across the forwardly-facing open mouth thereof and a rear portion including a main body supporting an electrical contact pair having a movable contact, a chamber being defined between the heat responsive member and the main body, a movable actuating member being provided which extends from the heat responsive member to the rear portion to act on the contact pair, the rear portion being of outer dimension slightly greater than the tubular portion with a shoulder therebetween whereby the switch has a plug-like shape for making a push-fit within a cylindrical opening or recess in an appliance.
- 29. A steam-responsive switch for use in an electrical water boiling appliance comprising a main body from which extends a tubular portion having at or near its leading end a heat responsive member extending across the mouth thereof which changes shape above a predetermined temperature defining a chamber behind the member and at the opposite face of the main body an electrical contact pair, the heat responsive member engaging a slidable actuating member which extends through the main body to act on the electrical contact pair, and a flexible bellows-type seal provided between the actuating member and the main body through which seal the actuating member extends.
Specification