A strain gauge incorporating a length of wire maintained under a predetermined tension and an electric magnetic device for plucking the wire at substantially the mid point of its length, the wire being disposed in a hollow spacer tube assembly comprising an outer tube formed of a material such as ebonite which while being longitudinally compressible nevertheless has a lateral stiffness sufficient to withstand forces which may normally be expected to be applied thereto when in use, and an inner t...

The invention is directed to an improved unitary, integral, detachable strain relief. At least one generally arcuate clamping arm is resiliently coupled to a generally tubular body member adapted to be detachably secured about the outer surface of a conector or similar article. Strap receiving means project outwardly from its associated clamping arm to at least partially retain therein a strap or band disposed thereabout to secure the clamping arm to a cable or a plurality of insulated electrica...

Apparatus and methods for measuring strain and torque are described. The apparatus, which is used in the methods, usually includes a thin walled cylinder within a thick walled cylinder, the cylinders being fixed together at their ends only, means for vibrating the walls of the thin walled cylinder and means for indicating the frequency of vibration. As torque is applied to the thick walled cylinder and therefore to the thin walled cylinder, longitudinal strain appears in the thin walled cylinder...

A strain sensor or extensiometer with electrical output designed to measure relative displacements between two axially spaced points on a stressed structure comprising an elongated body with two end sections and a centrally located flexible beam extending in a direction perpendicular to the longitudinal axis of the sensor body. Relative displacements of the end sections generate two opposing symmetrical torques at the ends of the beam. These torques or bending moments are impressed onto the beam...

A transducer comprising a balanced bridge, circuit having substantially similar pre-stressed force responsive components, force transmitting means for transmitting input force to a portion of the components and force relieving means for reducing the pre-stress on the remainder of the components in conjunction with the transmission of said input force, to effect a strong output signal of the transducer when an electrical potential is connected across the circuit.

An optical indicator of the type wherein the lessening of the load on a member under strain produces movement of an indicator element. Such movement takes place when the relaxation of the member under strain has reached a certain predetermined value thereby giving an immediate visual indication of that fact.

A strain gauge adapted to be adhesively mounted on a structural part in a place to be tested which is provided with at least one measuring grid and to the connecting ends of which are soldered measuring lines for conducting the current from the measuring grid; an extension of the carrier for the grid foil is provided along one edge of the strain gauge and is connected with the main carrier by a perforation.

A new adapter and method for providing strain relief to and creating a liquid tight seal around a cable including a first nut with a tubular extension, the tubular extension having a plurality of deflectable arms, each of which are radically converged and constricted about a cable under a compression force caused by the tightening of a second nut having a tapered region formed in an inner nut channel.

A reliable sensor provides a user-friendly semiconductor sensing device and transducer which accurately detects the characteristics of a fluid, such as pressure and strain, at high temperature operating conditions. The high performance sensor is particularly useful for use with diesel engines and internal combustion engines in vehicles. The sensor can comprise a single die with a transverse strain gauge or a group of strain gauges which are located at a position on the die to help minimize elect...

A strain gauge includes a flexible substrate and film of microfine grains of amorphous silicon connected between electrodes. A strain gauge assembly comprises a substrate, a first electrode formed on the substrate, a semiconductor body connected at a first end to the first wire and including a plurality of layers of different semiconductor materials forming a blocking diode and a resistance, and a second electrode connected to a second end of the semiconductor body such that the diode and resist...