Hand operated instruments having non-magnetic safety switch
Patent 4105885 Issued on August 8, 1978. Estimated Expiration Date: 
June 22, 1996. 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.
June 22, 1996. 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 ReferencesInventorAssigneeApplicationNo. 05/698713 filed on 06/22/1976US Classes:200/43.05, Actuator is circuit completing element200/42.02, Coded removable actuator200/52R, SPECIAL APPLICATION340/573.1, Human or animal42/70.01, SAFETY MECHANISM42/70.06, Trigger lock42/84, ELECTRIC APPLIANCES63/1.12With tool, e.g., knife, pen, lens, etc.ExaminersPrimary: Scott, J. R.Attorney, Agent or FirmInternational ClassesF41A 17/00 (20060101)F41A 17/06 (20060101) H01H 9/02 (20060101) H01H 9/06 (20060101) AbstractOperator controlled devices in the form of hand operated instruments in which a ring worn by an operator is configured to be insertable into a recess in a hand holdable portion of the instrument. The recess includes a fixed contact configuration that is engagable by a non-magnetic bridging contactor on an outer peripheral face of the ring, so that the instrument becomes operational when the contactor is inserted into the recess and engages the fixed contact configuration.Other References
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