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4709182 |
Method and apparatus for tightening or loosening screw-type connections
A method and apparatus for tightening or loosening screw-type connections, in which the screw bolt is stimulated to oscillate longitudinally, the natural frequency of the bolt is measured and the...
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4692615 |
Apparatus and method for monitoring tension in a moving fiber by Fourier transform analysis
A non-contact system for monitoring the tension in an optical waveguide fiber during drawing is provided. The system comprises: (a) means for sensing the motion of the fiber in a direction...
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4655093 |
Web tension measuring method and device
Web tension measurement in that the web (5) is caused to oscillate transversely with the resonance frequency for the portion of the web (5) defined by a support (2,2a). The oscillations are...
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4601200 |
Measuring apparatus
A measuring apparatus, including a measuring device; a measuring element secured at one of its ends to the measuring device; a measuring body secured on the free end of the measuring element; a...
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4568414 |
Methods and apparatus for tensioning sheet material
An electret sheet is clamped on an apertured support around the aperture so that a sheet portion stretches all across the aperture. A tension-producing ring is advanced against the sheet portion...
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4567451 |
Resonator having optical feedback coupling
A resonator device comprises an elastic beam driven electrostatically at its natural frequency, or an harmonic thereof, by voltage pulses applied to an integral paddle member. The voltage pulses...
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4565099 |
Method and apparatus for determining tension in a cable
A method and apparatus for measuring tension in a suspended cable or the like, wherein the tension may be derived from sensor signals corresponding to the fundamental frequency of vibration in the...
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4497209 |
Nondestructive testing of stress in a ferromagnetic structural material utilizing magnetically induced velocity change measurements
This disclosure relates to a nondestructive method of measuring stress in a ferromagnetic structural material. One method involves the measurement of the change in ultrasonic velocity induced by an...
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4445322 |
Apparatus to measure yarn tension
Apparatus to cause a running length of yarn to vibrate at its harmonic frequency and to electronically measure the harmonic frequency thereof to provide a signal which can be employed to maintain...
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4419896 |
Force or vibration indicating device utilizing microwave resonance ferramic gyrators
A very sensitive force or vibration indicating device is claimed and made by the use of the movement of a ferramic rod or slab of a microwave resonance ferramic gyrator in operation with microwave...
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4376368 |
Method to measure yarn tension
Method to detect the tension and/or variation in the tension of a running length of yarn by measuring the frequency of vibration of the yarn. The yarn is initially vibrated by impingement thereon...
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4277973 |
Vibratory wire strain gage
A vibratory wire strain gage and more particularly a vibratory wire strain gage having an improved means for readily tensioning the gage wire and, if desired, adjusting such tension prior to...
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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...
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4158962 |
Cable tension measuring apparatus
A method and apparatus is provided for measuring tension in stressed cables in which use is made of the relationship between the tension and the natural frequency of vibration of the cable. An...
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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...
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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...
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3938382 |
Method and apparatus for detecting shape of flat products
A method of detecting the shape of flat products, which comprises applying, through an exciter, to an examined objects in its width, exciting signal generated in an exciting signal generator, as an...
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3871217 |
Continuous cable tension monitor
A cable tension monitor has an electromagnet having a C-shaped pole piece extending along a cable adjacent thereto with the poles in a plane parallel to the cable axis. A coil on the pole piece is...
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3854329 |
APPARATUS FOR WEB TENSION MEASUREMENT
Tension in a web of paper is measured by exciting transverse vibrations in the web, by means of a moving coil loudspeaker, sensing the vibrations by means of a microphone, and applying part of the...
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3850031 |
PROCESS AND APPARATUS FOR DETERMINING THE VARIATION OF TENSILE STRESSES IN COLD-ROLLED STRIP OVER THE WIDTH THEREOF
The strip is pulled over two parallel supports, which are spaced in and extend transversely to the longitudinal direction of the strip. Each of a plurality of longitudinal zones of said strip...
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3613065 |
APPARATUS UTILIZING A VIBRATABLE MEMBER FOR DETECTING SUSTAINED TENSION IN A RUNNING LENGTH OR STRAND
Yarn running through a guide carried by a vibratable member induces vibration of the vibratable member at its natural frequency. A transducer converts this vibration into an electrical signal which...
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3540271 |
LOAD MEASURING METHOD AND APPARATUS
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3394587 |
Web tension indicator
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3093760 |
Composite piezoelectric element
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2923150 |
Tension measuring apparatus
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2792707 |
Device for use in determining tension in flexible sheet material
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