Thermostatically controlled electric kettle

• US 4,544,830 A
• Filed: 08/03/1984
• Issued: 10/01/1985
• Est. Priority Date: 08/12/1983
• Status: Expired due to Term

• Current Assignee: HP Intellectual Corp.
• Original Assignee: Black & Decker Incorporated (Stanley Black & Decker, Inc.)
• Inventors: Miller, Walter E.
• Primary Examiner(s): Bartis, A.
• Application Number:
  US06/637,595
• Time in Patent Office: 424 Days
• Field of Search: 219/328, 219/330, 219/436-438, 219/441, 219/442, 99/281
• US Class Current: 392/447
• CPC Class Codes: A47J 27/21058 Control devices to avoid overheating, i.e. "dry" boiling, or to detect boiling of the water A47J27/21158 takes precedence

Abstract

An electric kettle having an unrestricted spout opening is provided with an electric heating element controlled by a thermostatic simmer control or boil cutout, the thermostatic element of which is located exteriorly of the kettle body above the top thereof and adjacent to the spout opening. A steam diverter scoop extends into the spout opening to intercept the uppermost portion of the live steam flowing toward the spout opening and diverts it into heating relation with the thermostatic element to provide rapid heating thereof upon commencement of active boiling in the kettle. The thermostatic element is housed within the forepart of the kettle handle, which also serves to conceal the wires connecting the thermostatic element to the heating element and other electrical components located in the bottom of the kettle. The diverter includes a shield portion in radiation shielding relation to the thermostatic element to limit radiation of heat to the element from the kettle body. The provision of a thermostatic element which is normally shielded from the rise in temperature in the kettle interior while being exposed a portion of the stream of steam generated upon free boiling within the kettle permits use of a coarsely calibrated, not unduly sensitive, thermostatic element ensuring switching off or other control function of the kettle regardless of altitude.

Claims

1. In an electric kettle having a kettle body, an electrical heating means associated with said kettle body for heating liquid within said body, an open aperture located in an upper portion of the body above the liquid level therein for the substantially unrestricted passage of steam therethrough;

thermally activated control means connected to said heating means in controlling relation therewith, including a temperature sensitive portion thereof located exteriorly of said body in enclosed relation in an upper portion of the kettle;

the improvement comprising

shield means interposed between said control means and the interior of said body to limit the transfer of heat to said temperature sensitive portion during operation of the kettle, and fluid diverter means located within the kettle adjacent said aperture to intercept a portion of steam flowing towards said aperture and to divert said portion towards said temperature sensitive portion of said control means to provide rapid heating thereof on the commencement of active boiling of liquid within the kettle.

2. The kettle as claimed in claim 1, including deflector means located adjacent said temperature sensitive portion, to deflect said diverted steam against the portion.

3. The kettle as claimed in claim 2, wherein said deflector means includes a shield portion located beneath said temperature sensitive portion in radiation shielding relation therewith.

4. The kettle as claimed in claim 1, including handle means, said thermally activated control means being located therein.

5. The kettle as claimed in claim 4, having said fluid diverter means extending forwardly of said handle means and extending through said aperture into said kettle body, said control means comprising switch means electrically connected in controlling relation with said electrical heating means by conductors extending within said handle means.

6. The kettle as claimed in claim 5, said handle means forming in combination with an upper portion of said kettle body underlying said handle means a substantially enclosed chamber containing said thermally activated control means, said chamber being connected by said diverter means to the interior of the kettle, to receive steam therefrom when boiling occurs, said substantially enclosed chamber including at least one leakage path therefrom to permit the fluid received therein to escape exteriorly of the kettle.

7. The kettle as claimed in claim 1, said fluid diverter means including a scoop located adjacent said aperture, having a portion thereof extending within said kettle body to divert steam away from said aperture towards said temperature sensitive portion of said control means.

8. The kettle as claimed in claim 7, said scoop bounding the uppermost side of said aperture.

9. The kettle as claimed in claim 1, said fluid diverter means including a scoop extending through said aperture into said kettle body to provide a gaseous flow passage external to the body, to direct steam rearwardly away from the aperture towards said temperature sensitive portion of said control means, located rearwardly of the aperture.