H - Electricity – 05 – B
Patent
H - Electricity
05
B
309/39
H05B 3/82 (2006.01) A47J 27/21 (2006.01) H05B 3/04 (2006.01)
Patent
CA 1180366
ABSTRACT "ELECTRICAL IMMERSION HEATERS AND LIQUID HEATING APPLIANCES INCLUDING SUCH HEATERS" The immersion heater comprises a mounting plate , a metal sheathed heating element having two end portions which extend through and which are secured to the mounting plate, and a single fastening device for fixing the mounting plate to the body shell of the appliance. The fastening device comprises a threaded heat conductive stud secured to the mounting plate and a nut having a complementary thread. A raised part of the active portion of the heating element is directly secured to and only to the stud, such as by brazing. A bimetallic element is fixed directly to the stud on the outside of the body shell. The stud provides a heat conductive path between the heating element and the bimetallic element . The bimetallic element bends when the appliance is energised 'dry' or when the liquid has boiled down to the element and pushes a dolly overcentre to open a pair of contacts and de-energise the heating element. The appliance is, preferably, an electric kettle provided with a further bimetallic element which switches off the kettle when water therein boils.
403677
Inskip Michael
Warren Alan
Marks & Clerk
Ti Russell Hobbs Limited
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