Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With bimetallic element
Patent
1983-09-14
1984-12-25
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With bimetallic element
337112, 337365, 337380, H01H 3704, H01H 3752
Patent
active
044907044
ABSTRACT:
A thermally responsive switching device suitable for use as a motor protector and the like is disclosed. Such device includes a housing assembly consisting of a thermoplastic base and a shallow drawn metallic cover. The base provides sidewalls extending to a peripheral flange against which a flange on the cover is positioned. The thermoplastic material is deformed inwardly around the cover flange to permanently connect the assembly. The switch includes an elongated bimetal snap element supported at one end on the end of a heater in heat exchange relation therewith. The other end of the heater is connected to an external terminal through an opening in the thermoplastic base. The terminal provides a tubular projection extending through the opening and a plurality of inwardly extending, resilient tabs which are welded to the heater. The resilient tabs resiliently bias the heater toward the terminal to ensure that looseness does not occur if the base material shrinks and to accommodate differential thermal expansion to prevent looseness or excessive stresses in the thermoplastic material. A mounting stud is welded to one end of the snap element and a movable contact is welded to the other end. Reinforcing elements cooperate with the stud and the movable contact to sandwich the material of the bimetal therebetween to minimize fatigue inducing stress concentrations.
REFERENCES:
patent: 3430177 (1969-02-01), Audette
patent: 4015229 (1977-03-01), Senor et al.
Risacher Gerard H.
Snider Harold F.
Broome Harold
Therm-O-Disc Incorporated
LandOfFree
Thermally responsive switching device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Thermally responsive switching device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermally responsive switching device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1155324