Thermal cycling switch
Patent 5021762 Issued on June 4, 1991. Estimated Expiration Date: 
August 3, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 3, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2623137 3110789 3634802 Electrical switch construction, switch blade subassembly and methods of making the same Thermal cycling switch Patent #: 4471338 InventorAssigneeApplicationNo. 562270 filed on 08/03/1990US Classes:337/103, With heater-adjusting, shunting or short-circuiting means337/41, Multiple contact or plural circuit control means337/93With interval predetermining or adjustment meansExaminersPrimary: Broome, HaroldAttorney, Agent or FirmInternational ClassesH01H 061/08H01H 071/16 AbstractA thermal cycling switch has an insulated housing carrying a centrally located rotating cam. The cam operates a first ON/OFF switch connectable between a pair of contacts that are connected to one side of a load and one power line. The rotary cam also moves an adjusted contact mounted on an adjustable arm which cooperates with a cyling arm contact to operate as another switch between the other side of the load and another power line. The cycling arm includes a bimetal member which is electrically insulated at the base, as well as a current conducting strip formed of pure nickel metal extending along the low expansion side of the bimetal member. The metal strip is heated by a separate resistance wire wrapped around an insulated cover on the metal strip and connected across the load so that whenever the load is energized from the power lines, the metal strip is heated to produce an initial biasing force causing the contacts to close in opposition to the thermal expansion of the bimetal, which tends to cause the contacts to open.Field of SearchWith external or auxiliary heating meansWith heater-adjusting, shunting or short-circuiting means Plural heating means With electrical power supply or current control means Inductive means (e.g., transformer) Significant heating element structure or composition Bimetallic means With external circuit connection means Comprising electric shunt or short-circuiting means With interval predetermining or adjustment means With manual or other mechanical contact controlling means Plural elements combined with single mechanical means Independently operative bimetallic elements Multiple contact or plural circuit control means | |
