Class 73/862.24 - Rate of change

Subclass of Class 73 - Measuring and testing
Definition: Subject matter comprising means for detecting a predetermined
No. of patents: 23
Last issue date: 07/15/2008

Number	Title	Issue Date
7398700	Bolt tightening method and bolt tightening apparatus After it is tightened with a snug torque TA, a bolt is tuned by a total turning angle θS equivalent to the sum of an initial-set turning angle θA and a corrective additional-turning angle (θB+θC). The correc...	07/15/2008
7392711	Insertable strain gauge spanner An insertable strain gauge spanner which comprises a spanner body having a rod body and a driving head insertable into the rod body; the rod body having a handle and an inserting opening at one end thereof; the inserting opening can be received the driving head; the...	07/01/2008
7380472	Hand tool with torque measuring device A hand tool includes a handle and a function head is connected to an end of the handle. A first recess and a second recess are respectively defined in two opposite sides of the handle, and a strain transducer is engaged with the first recess. A display member and a ...	06/03/2008
6532648	Apparatus for fixedly connecting threaded tubes, and recording medium storing control program Method of fixedly connecting together externally and internally threaded tubes by tight engagement of externally and internally threaded portions of the tubes, wherein a wrenching operation is performed to rotate the externally and internally threaded tub...	03/18/2003
6443019	Torque sensor and method of producing a torque-dependent signal A torque sensor has a generator whose output signal is a function of a torque, a second signal generator, whose output signal changes in an opposite direction as a function of the torque, and an evaluation device which has a summing means which is connect...	09/03/2002
6354156	Torque sensor and method of producing a torque-dependent signal A torque sensor has a first signal generator whose output signal changes as a function of a torque, a second signal generator whose output signal changes in the opposite direction as a function of the torque, and a circuit which has a difference-forming u...	03/12/2002
6212763	Torque-turn system for a three-element sucker rod joint A sucker rod tool system for oil wells monitors both torque and angular displacement of a three-element sucker rod connection. The tool system engages two sucker rods that are at least partially screwed into opposite ends of a sucker rod coupling. The sys...	04/10/2001
5402688	Method and apparatus for determining the tightened condition of a pipe joint During the period from the start until the completion of tightening of a pipe joint, the tightening torque applied to the pipe joint and the number of turns are sampled at prescribed intervals and stored. After the completion of tightening, a differential...	04/04/1995
4995145	Reduction of relaxation induced tension scatter in fasteners A method of reducing variations in the static torque of threaded fasteners, as measured after a relaxation period, uses an instrumented nutrunner to "break" the joint. Breaking the joint is done by monitoring the torque and angle of the fastener during a ...	02/26/1991
4987669	Method of tightening screw In a method of tightening a screw member, the difference between the tightening axial force which is produced at the limit of elasticity when the friction coefficient between the screw member and a member into which the screw member is to be threaded is a...	01/29/1991
4894767	Method for yield tightening of screws A method for yield tightening of screws by use of a wrench including a device for detecting a tightening torque in the actual tightening process, a device for detecting a tightening angle and an electric motor for applying a torque to each screw, a device...	01/16/1990
4667389	Apparatus and method for connecting two threaded members An apparatus (10) and method is disclosed for connecting a pipe (12) and a test plug (28) comprising a carriage assembly (14) positioned on a base (16) that is capable of horizontal and vertical movement relative to base (16). Opposed pairs of fluid opera...	05/26/1987
4400785	Microprocessor monitoring system for fastener tightening A method for monitoring torque and angle developed upon a fastener during fastener run-up and setting, which method utilizes successive area measurements under a torque-angle curve, said areas being compared at predetermined torque levels to provide an in...	08/23/1983
4333220	Method and apparatus for tightening an assembly including a pre-load indicating fastener A method and apparatus for tightening an assembly including a pre-load indicating fastener is disclosed. Pre-load indicating fasteners are generally tightened until a crushable element, forming a portion of the pre-load indicating fastener, is plastically...	06/08/1982
4259869	Method and apparatus for inspection and fail-safe control of threaded joint tightening processes A method and apparatus for inspection and control of threaded joint tightening processes by registering over the main part of the tightening process the momentary values of the torque delivered to the joint and the angular displacement of the joint and by...	04/07/1981
4228576	Tension control of fasteners There is disclosed a technique for tightening threaded fasteners in which values of offset torque, initial tension rate relative to angle, final tension rate relative to angle and other joint related factors are empirically determined by instrumenting a p...	10/21/1980
4102182	Quality checking system for a threaded fastener assembly A method for measuring the relationship between the angle of rotation of a threaded fastener and the torque applied to the threaded fastener and for detecting variations in the rate of increase of torque with respect to the corresponding angular displacem...	07/25/1978
4023406	Tightening system with torque-time control The invention disclosed herein relates to a tightening system including a wrench for applying torque to a fastener system. Associated with the wrench is a control system including measuring means for developing a first signal representative of the torque ...	05/17/1977
4008772	Tightening system The preferred embodiments of the invention disclosed herein relate to a tightening system comprising a wrench for rotating and applying torque to a fastener system, means for developing a signal representative of the torque being applied and means for dev...	02/22/1977
4008773	Tightening system The preferred embodiments of the invention disclosed herein relate to a tightening system comprising a wrench for rotating and applying torque to a fastener system, means for developing a signal representative of the torque being applied and means for dev...	02/22/1977
4000782	Tightening system with quality control apparatus A tightening system for tightening a fastener is disclosed herein and includes a wrench for tightening the fastener, a control system for shutting off the wrench when the fastener has been tightened to a predetermined condition and a quality control syste...	01/04/1977
3982419	Apparatus for and method of determining rotational and linear stiffness A meter for determining stiffness or torque gradient including, in one embodiment, a deflectable coupling connected between an output shaft and a power input shaft, sensing means for developing two separate series of signals representative of the displace...	09/28/1976
3973434	Tightening system with quality control apparatus A tightening system for tightening a fastener is disclosed herein and includes a wrench for tightening the fastener, a control system for shutting off the wrench when the fastener has been tightened to a predetermined condition and a quality control syste...	08/10/1976

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Class 73/862.24 - Rate of change