H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/183
H01H 37/54 (2006.01) A47J 27/21 (2006.01)
Patent
CA 1139809
ABSTRACT Disclosed is a switch unit for an electric immersion heater for mounting on the wall of a liquid heating vessel, the switch unit including thermally responsive means sensitive to boiling liquid on a body of the switch unit in a position for exposure, in use, to vapour emerging from the vessel. The thermally responsive means comprises a snap-acting bimetallic actuator comprising a member of sheet bimetal having an aperture with an outer perimeter and an inner perimeter defining a tongue free at one end inter- mediate two lobe portions of the aperture. The inner perimeter and arcuate portions of the outer perimeter smoothly merge at rounded ends of the aperture adjacent the tongue root. The tongue is, at least in part, generally centrally disposed with respect to the member, the member having been deformed in a die pressing operation to conform in shape to a die of domed configuration, the domed area being such as to reverse its curvature with a snap action with change in temperature, and the width of the domed area being greatest in the region of the tongue root. An overcentre spring mechanism couples the bi- metallic actuator to a movable contact of an electrical switch for opening and closing the switch, the overcentre spring mechanism being movable between a first position in which the switch is closed and power can be supplied to the immersion heater and a second position in which the switch is open for interrupting the supply of power to the immersion heater. A lever of the overcentre mechanism is pivotally mounted on the body and a spring of the over- centre mechanism is mounted between fulcrums provided by the lever and the body so that the spring biasses the lever into direct or indirect engagement with the bimetallic actuator in the first position of the overcentre mechanism.
343707
Fetherstonhaugh & Co.
Taylor John C.
LandOfFree
Switch units for electric immersion heaters does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Switch units for electric immersion heaters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Switch units for electric immersion heaters will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1086294