Break-away door knob
Patent 4195502 Issued on April 1, 1980. Estimated Expiration Date: 
June 2, 1998. 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 2, 1998. 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 2138856 3621685 InventorsAssigneeApplicationNo. 05/911962 filed on 06/02/1978US Classes:70/224, Lock and handle assembly70/422Yielding or frangible connectionsExaminersPrimary: Wolfe, Robert L.Attorney, Agent or FirmInternational ClassE05B 17/00 (20060101)AbstractA door knob on a knob sleeve or spindle which is adapted to be blocked from rotation is connected to such spindle by a break-away ring and is otherwise rotatable on the spindle. The break-away ring is mounted about the spindle between the end of the fixed hub of the lock chassis and an internal flange on the knob, and has a pair of radial lugs extending inward to key it to the spindle and a pair of axial lugs extending into the knob flange to key it to the knob. One pair, preferably the axial pair of lugs, is adapted to break away under excessive knob turning force to disconnect the rotative connection of the knob to the spindle.Field of SearchLock and handle assembly | |
