Apparatus for automatically controlling the operation of automatic door
Patent 4092575 Issued on May 30, 1978. Estimated Expiration Date: 
May 30, 1995. 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.
May 30, 1995. 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 3039764 3180635 3886425 3891909 InventorsAssigneeApplicationNo. 718820 filed on 08/30/1976US Classes:318/282, In response to movement or position (e.g., limit of travel) of motor or driven device49/29, TIME CONTROLLED49/360, Operator drives closure along guide318/286Movement or position of motor or driven deviceExaminersPrimary: Schaefer, Robert K.Assistant: Duncanson, W. E. Jr. Attorney, Agent or FirmInternational ClassG05D 003/00Foreign Application Priority Data1975-09-08 JAAbstractApparatus for automatically controlling the operation of a reciprocable door between its closed and opened positions. A position sensing means is provided for sensing the position of the door during its opening and closing strokes to decelerate the speed of the door at a final portion of the door stroke, thereby preventing the door from striking an outer door frame. | |
