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| Number | Title | Issue Date |
| 7278341 | Structural bolt security apparatus A structural bolt security apparatus includes a security nut forming a threaded central hole for a bolt; the security nut has a groove in an upper surface and/or a side surface. At least one groove is at least partially separated from the threaded central hole by th... | 10/09/2007 |
| 7259574 | Sensor device for measuring frequency and amplitude of varying force signals A sensor device for measuring frequency and amplitude of a varying force signal is provided. The sensor device comprises a sensing element defined by a plurality of even numbered planar segments symmetrically disposed about a central axis, a protective housing for h... | 08/21/2007 |
| 7152475 | Device and method for measuring axial force of bolt The present invention provides an axial bolt force measuring instrument for measuring an axial force of a bolt for a hub that couples a wheel and an axle of a vehicle, where the instrument is provided with a setting portion that sets a predetermined axial force of t... | 12/26/2006 |
| 6845671 | Inverse method to estimate the properties of a flexural beam and the corresponding boundary parameters A system and method is used for estimating the properties of a flexural beam. The beam is shaken transverse to its longitudinal axis. Seven frequency domain transfer functions of displacement are measured at spaced apart locations along the beam. The seven transfer ... | 01/25/2005 |
| 6740878 | System and method for automatically tensioning wires and for retaining tensioned wires under tension A wire tensioning apparatus and method tensions one or more wires by moving the tensioning function from a wire module to an apparatus external to the wire module. Within the wire module, the wire is placed between a movable member and a stationary member. Tension i... | 05/25/2004 |
| 6588088 | System and method for automatically tensioning wires and for retaining tensioned wires under tension A wire tensioning apparatus and method tensions one or more wires by moving the tensioning function from a wire module to an apparatus external to the wire module. Externally to the wire module, a wire is attached to a fixed end and a movable end. Tension... | 07/08/2003 |
| 6286374 | Preload measuring apparatus of rolling bearing A preload measuring apparatus to measure the preload of a rolling bearing that includes a bearing support, a pressurization device, an excitation device, a vibration sensor, and a control section. The bearing support supports a rolling bearing by supporti... | 09/11/2001 |
| 6279647 | Method and device for sensing a clearance A method and an arrangement for sensing the clearance between an object and an object-adjacent surface, which is particularly for use in difficult ambient conditions, such as in dirty, corrosive environments and under varying temperature and pressure cond... | 08/28/2001 |
| 6279810 | Piezoelectric sensor for measuring bonding parameters A sensor for an ultrasonic bonding apparatus comprises a piezoelectric material located between the ultrasonic transducer and an ultrasonic concentrator of the bonding apparatus. The sensor has at least two outputs for measuring different bonding paramete... | 08/28/2001 |
| 5854993 | Component machine testing using neural network processed vibration data analysis A component machine testing technique is provided that performs diagnostic analysis on a vibration signal of the component machine that has been separated from power and load machine background noise in a first neural network. The diagnostic analysis, wit... | 12/29/1998 |
| 5821430 | Method and apparatus for conducting in-situ nondestructive tensile load measurements in cables and ropes An apparatus and method for the non-contact measurement of tensile loading (or tension) in ferromagnetic materials, particularly wire ropes, cables, and strands. The magnetostrictive effect is used to measure wave propagation properties within such materi... | 10/13/1998 |
| 5750894 | Measurement of tension using natural frequency of vibration A method of determining the tension in a guy wire or other flexible member. The first 15 natural frequencies for the design tension and tensions at 1 percent increments above and below the design tension are calculated. The actual first 15 natural frequen... | 05/12/1998 |
| 5625146 | Method and system for determining axial modulus A method is provided for determining the axial modulus of an elongate matal sample of mass density .rho. and length L. The first end of the sample is driven longitudinally at a frequency of excitation ω. The second end of the sampl... | 04/29/1997 |
| 5563348 | System for measuring stress In a stress measuring, system sensor driving power and a signal sensed by a sensor are transmitted and received in the form of a light pulse signal to thereby improve a noise resistant property as well as a measuring accuracy and reliability. The stress m... | 10/08/1996 |
| 5483842 | Force sensor using a piezoceramic device A force sensor is provided which incorporates a piezoceramic element between first and second members that are moveable relative to each. The piezoceramic element is disposed within a cavity that is formed in the first member. The cavity extends between a... | 01/16/1996 |
| 5316562 | Optical fiber tension monitoring technique As an optical fiber (12) is being drawn, air (14) is directed at a portion of the fiber as a succession of air pulses, the pulses having a frequency near the natural frequency of the fiber portion. The frequency of the air pulses is then varied over a ran... | 05/31/1994 |
| 5239563 | Plasma momentum meter for momentum flux measurements Invention comprises an instrument in which momentum flux onto a biasable target plate is transferred via a suspended quartz tube onto a sensitive force transducer--a capacitance-type pressure gauge. The transducer is protected from thermal damage, arcing ... | 08/24/1993 |
| 5228893 | Optical fiber tension monitoring technique As an optical fiber (12) is being drawn, air (14) is directed at a portion of the fiber as a succession of air pulses, the pulses having a frequency near the natural frequency of the fiber portion. The frequency of the air pulses is then varied over a ran... | 07/20/1993 |
| 5172591 | Oil well sucker rod load measurement A load measuring system comprising an acoustic transmitting transducer for injecting an acoustic signal into a load bearing portion of a sucker rod, and receiving transducer for detecting the signal after it passes through a known length of a sucker rod, ... | 12/22/1992 |
| 5068800 | Crack detection method for shaft at rest The presence, size and location of a crack in a shaft is determined by comparing actual measured natural frequencies of the shaft system with the results of an analytical model. From a multi-station analytical model of an uncracked shaft system, natural f... | 11/26/1991 |
| 5058439 | UT socket assembly An ultrasonic transducer socket assembly for simultaneously tightening a bolt and measuring bolt load. A pole adaptor rigidly attached to a driving socket for engaging and driving a bolt has a stationary cylinder mounted therein. A second cylinder rotatab... | 10/22/1991 |
| 4975855 | Shaft crack detection method The presence, size and location of a crack in a shaft is determined by comparing actual measured natural frequencies of the shaft with the results of an analytical model. From a multistation analytical model of an uncracked shaft, natural frequencies and ... | 12/04/1990 |
| 4625554 | Device for tightening a nut on a fastening pin of a nuclear reactor guiding tube A tightening wrench (5) carrying a measuring cell (8) freely mounted in the hollow part (4) of a wrench (5) and adapted to bear against an end of the pin (2) subjected to the pretension. A detector emitting and receiving ultrasounds (21) disposed inside t... | 12/02/1986 |
| 4602511 | Method for measuring fastener stress utilizing longitudinal and transverse ultrasonic wave time-of-flight A method and apparatus for measuring tensile stress in a fastener already in place. This method capitalizes on the discovery that a longitudinal wave will travel roughly twice as fast as a transverse wave and the times-of-flight of the two waves are affec... | 07/29/1986 |
| 4335603 | Sonic measurement of web tension Tension in a moving web is measured by subjecting the web to an ultrasonic pulse train and measuring the time interval for the resultant transverse waves in the web to proceed a known distance past a point upstream (or downstream). The composite web plus ... | 06/22/1982 |
| 4235102 | Method and apparatus for measuring the ratio between web tension and substance A method and apparatus is provided for measuring the ratio between web tension and web substance by causing the web to vibrate at its resonance frequency, measuring the pressure variations or the signal causing the web vibration to produce a first signal,... | 11/25/1980 |
| 4152929 | Roof bolt tension determination Apparatus and method for determining the tensile load on a mine roof bolt, which is indicative of the support provided by the bolt. The device comprises a hammer for striking a roof bolt to produce a sound pulse, a microphone for picking up the sound puls... | 05/08/1979 |
| 4109520 | Method and means for measuring web tension in paper or foils A tension in a paper or foil web is measured by subjecting an area of the web between points of support to transverse oscillations. The impedance of an oscillation generating means located adjacent the web changes with the oscillation and impedance is mea... | 08/29/1978 |
| 3975948 | Method of measuring axial force on a body utilizing two vibration modes of ultrasonic waves A method for measuring the axial force exerted on a body to be measured by applying two ultrasonic frequencies respectively having a transverse-wave vibration mode and a longitudinal-wave vibration mode to a body on which an axial force is exerted, measur... | 08/24/1976 |
| 3969810 | Method for tightening a bolt to exert a predetermined tension force by monitoring bolt elongation while the bolt is being installed Method and apparatus for tightening a bolt or a machine screw to exert a predetermined tension force by monitoring bolt elongation while the bolt is being installed. The apparatus of the present invention includes a drive means adapted to engage the head ... | 07/20/1976 |
| 3942369 | Method of and apparatus for measuring and setting the tension of stressed members Resonant vibration is employed for imparting oscillations to a stressed wire, cable or metallic strip for the purpose of measuring its tension or for setting the vibrated member at a desired tension. A U-shaped magnetic resonator has an air gap to receive... | 03/09/1976 |
