B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
113/66
B21D 22/20 (2006.01) B21D 24/00 (2006.01) B21D 26/00 (2006.01) B21D 37/00 (2006.01) G01K 5/68 (2006.01) H01H 11/00 (2006.01) H01H 37/54 (2006.01)
Patent
CA 1086149
Abstract of the disclosure A method of forming a snap-acting thermally responsive bimetallic actuator comprising (1), forming from sheet bimetal, a member having an aperture with an arcuate outer perimeter and an inner perimeter defining a tongue free at one end, said free end being close to the outer perimeter, the outer and inner perimeters smoothly merging at rounded ends of the aperture adjacent the tongue root, and the radial width of the member at the tongue root being substantially greater than the width opposite the free end of the tongue and (2) pressing said member overall between a die shaped to a domed configuration and an incompressible rubber pad to impart a domed configuration to the member. This method provides a far greater yield than conventional methods wherein an actuator is pressed between mating steel dies. Prior to the pressing operation the member may be pressed between the rubber pad and a die having an oppositely domed configuration to the first die. The rubber pad may be mounted in a dolly movable between the dies. An electrical contact may be applied to the member prior to pressing, and the pressing is carried out with the contact face down on the pad. Subsequent to pressing, but prior to any temperature induced snap action, the curvature to the member is mechanically reversed with a plunger assembly, the distance moved in the reversal being accurately controlled since the mechanical reversal significantly affects the subsequent operating temperature of the actuator.
264293
Fetherstonhaugh & Co.
Taylor John C.
LandOfFree
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