Electronically indicating torque wrench
Patent 4244434 Issued on January 13, 1981. Estimated Expiration Date: 
December 4, 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.
December 4, 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 1958326 3103984 Electronic torque wrench Torque spanners Electronic torque wrench Patent #: 4073187 InventorApplicationNo. 05/966395 filed on 12/04/1978US Classes:177/245, COMBINED73/862.23, With detection of specific torque value or condition (e.g., peak torque)81/467, Responsive to torque on work81/477Work engaging portion attached to and turned by resilient memberExaminersPrimary: Miller, George H. Jr.Attorney, Agent or FirmInternational ClassesB25B 23/14 (20060101)B25B 23/142 (20060101) G01L 1/14 (20060101) AbstractAn electronically indicating torque wrench utilizes a variable frequency stress transducer to detect the level of torque applied by the wrench. The stress transducer is operatively coupled to an arm of the wrench, said arm having a mechanical stress that is a function of an applied torquing force. The output of the stress transducer is compared to a reference whose calibration corresponds to desired torque settings. An indicator provides audible and visual indications when the applied torque equals the desired value. | |
