Manual control apparatus
Patent 4189950 Issued on February 26, 1980. Estimated Expiration Date: 
February 13, 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.
February 13, 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 1454574 1905569 3733914 Paper scoring and slitting machine Patent #: 3961547 InventorApplicationNo. 05/877689 filed on 02/13/1978US Classes:74/89.38Including means to selectively transmit power (e.g., clutch, etc.)ExaminersPrimary: Husar, C. J.Assistant: Berman, Conrad L. Attorney, Agent or FirmInternational ClassesF16K 31/143 (20060101)F16K 31/14 (20060101) F16K 31/05 (20060101) F16H 25/20 (20060101) AbstractA manual override apparatus for use with normally, automatically, powered driving assemblies such as valve actuators, the override apparatus having a body with a bore therethrough, a housing secured to the body and having an axial bore which registers with the bore in the body, a rotatable split drive nut mounted in the housing, a drive screw extending into the registering bores in the body and the housing and mounted for axial movement therein, a camming system for selectively engaging and disengaging the drive nut with the drive screw whereby engagement of the drive screw with the drive nut and rotation of the drive nut causes axial movement of the drive screw, and a biasing assembly operatively connected to the split drive nut which exerts a biasing engagement force on the drive nut when a given magnitude of resistance to engagement is encountered. | |
