Patent ID: 7301434

Claim:
A single phase motor protector comprising: a generally cup shaped metallic housing being elongated along a longitudinal axis from first to second opposite ends and having a closed top wall, a side wall having a free end extending around the circumference of the top wall and forming a rounded junction therewith, the top and side walls forming a switch chamber, a calibration rill having a rigid flat bottom surface formed in the top wall extending from the first end through the rounded junction to a calibration ridge along the longitudinal axis, a weld projection formed on the calibration rill intermediate to the first end of the metallic housing and the calibration ridge extending into the switch chamber, the rigid flat bottom surface as a whole being deformable to change the angle of a first plane in which the rigid flat bottom surface lies, an elongated thermostatic disc having first and second ends disposed along the longitudinal axis, the first end of the thermostatic disc welded to the calibration rill at the weld projection and generally lying in a plane parallel to the first plane, the thermostatic disc having a ring shaped deformation in a central portion of the thermostatic disc, the ring shaped deformation being movable between oppositely dished configurations in response to selected changes in temperature, a movable electrical contact mounted on the thermostatic disc at the second end thereof, the thermostatic disc being positioned along the longitudinal axis so that the calibration ridge is aligned with the ring shaped deformation, an electrically conductive header plate received on the free end of the side wall and hermetically attached thereto, a terminal pin extending through an aperture in the electrically conductive header plate into the switch chamber, the terminal pin electrically separated from the electrically conductive header plate by an electrical insulating material, an electrically conductive heater electrically connected to the terminal pin, and a stationary electrical contact mounted on the electrically conductive heater with the movable electrical contact adapted to move into and out of engagement with the stationary electrical contact.