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US Patent 4091451 - Method of and apparatus for making up a threaded connection
US Patent Issued on May 23, 1978
Estimated Patent Expiration Date:
May 23, 1995Estimated 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.
Estimated Patent Expiration Date:
May 23, 1995Estimated 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.AbstractA method of and apparatus for making up two members having mating threaded connections, such as pipe joints or bolts, for insuring that a specified number of threads have been engaged and a specific torque has been applied. The mating threaded connections are threadably engaged while measurements are made of the torque required to turn one of the members relative to the other, and measurements are made of the number of turns of the members relative to each other. In order to insure that a bad joint is not made up, the measurements of torque and turns must remain within specified parameters or the threaded interconnection is discontinued. The method and apparatus further includes avoiding erroneous turn measurements that may occur such as due to bending or swaying of one of the members during makeup. | InventorsAssigneeApplicationNo. 791113 filed on 04/26/1977US Classes:700/275, Mechanical control system73/862.23, With detection of specific torque value or condition (e.g., peak torque)73/862.25, Power tongs173/182Strain gaugeExaminersPrimary: Wise, Edward J.Attorney, Agent or FirmUS Patent References3606664, 3745820, 3888116, 3905427, 3974685, Tightening system and methodIssued on: 08/17/1976 Inventor: Walker3975954, Method and apparatus for evaluating torquing operations Issued on: 08/24/1976 Inventor: Barnich3982419, Apparatus for and method of determining rotational and linear stiffness Issued on: 09/28/1976 Inventor: Boys4008773, Tightening system Issued on: 02/22/1977 Inventor: Wallace , et al.4026369Yield torque apparatus Issued on: 05/31/1977 Inventor: Vliet International ClassesG01L 005/24G06F 009/16 |
