Abstract:
A sensor for detecting angular displacement of an object. The sensor comprises a substrate for attachment to the object whose angular displacement is to be sensed and a sensing means attached to the substrate and connectable into an electric circuit. The electric circuit measures the resistance of the sensing means, which changes as a function of the angular displacement. Several embodiments are disclosed, including a conductive elastomer sensor, a conductive ink sensor, a sliding resistor sensor, a force sensitive resistor sensor and a conductive fluid sensor.
Abstract:
A trailer coupling including an intermediate unit to be inserted between a standard-type connecting coupling and a trailing vehicle and having integrated therein a force measuring cell for determining vertical forces. Furthermore, horizontal pushing and pulling forces may be determined by integrating at least one force measuring cell acting in horizontal direction. The fifth wheel coupling of semi-trailers may have integrated force measuring cells measuring forces acting in vertical, longitudinal, horizontal and/or lateral horizontal directions.
Abstract:
A pressure responsive potentiometer, including an elastic body which includes a silicone mass mixed with a carbon fraction in a quantity such that the electrical resistance across the body is changed when a force is applied to the body, which body has electrically conductive contact tabs or plates or like elements connected thereto in mutually spaced relationship. The invention is characterized in that the body (1) is composed of a mixture including a silicone mass, silicone oil and carbon grains, where the weight ratio of silicone mass to silicone oil is about 1:0.3 to 1:0.5, preferably about 1:0.4, and where the carbon grains have a size which is greater than a size corresponding to a 50 mesh sieve (50 meshes per inch) and a size which is smaller than the smallest dimension of the body (1).
Abstract:
A pressure transducer comprising a rigid body formed of noncreeping material with a ringlike shape and having a central opening, and a radially extending plane end surface, a diaphragm unitary with said rigid body and covering said opening at an end surface opposite to said plane end surface, and thickfilm resistor means applied to at least one of two main surfaces of said diaphragm.
Abstract:
An electrical control device (8) is operable by a lever (12) and includes a deformable member (50) which is deformed in response to manual pressure on the lever. The deformable member (50) has an electrically conductive surface portion (52) which is arranged to engage a continuous area or track of resistive material (62) such that as a changing manual pressure is applied to the lever (12) a changing amount of the track is electrically bridged or short circuited by said conductive surface portions (52). The resistive area or track is connected to electrical terminals (64, 66) so as to present a continuously variable electrical resistance across the terminals depending on the manual pressure applied.
Abstract:
A novel force measuring device of simple design is provided with complementary stop surfaces protecting the device against over-loading. Alternatively, overloading is prevented by duplicating the force measuring device with two portions operating in opposite directions of force application. Such force measuring devices are advantageously incorporated in couplings between a motor driven vehicle and a further vehicle to be coupled thereto. Signals derived from these force measuring devices are used in a board computer for controlling the operation of the motor driven vehicle and the further vehicle coupled thereto.
Abstract:
A coaxial cable pressure sensor having a partially conductive layer of fibres or particles between the inner and outer coaxial conductors whereby pressure applied to the sensor produces a detectable change in resistance of the circuit passing through the partially conductive layer. One or more of the sensors may be incorporated into a vehicle weighing system, preferably in the form of a portable "mat" which may be folded or rolled up.
Abstract:
A variable force push button is used as an input device for a control system. Specifically, a bi-directional storage device produces a command that is applied to an element to be controlled. A signal is generated having a characteristic representative of the force applied to the push button. A representation of the characteristic is integrated by the storage device. In addition to changing the characteristic by varying the force applied to the push button, the user can change the direction of the integration, thereby increasing and decreasing the value of the command. The push button comprises a pressure sensitive element sandwiched between electrically conductive contacts one of which is actuated by the user. The pressure sensitive element is constructed of conductive particles in an elastomeric matrix. Preferably, electrically conductive micro-agglomerates of unbound finely divided electro-conductive carbon particles having a maximum dimension of between about 0.1 and about 10 microns are enclosed by a matrix of elastomeric material and finely divided electro-conductive carbon particles bound together by the elastomeric material.
Abstract:
The invention relates to such signal transmitters for electrical signals which comprise an elastic body (1) consisting of an elastomer matrix containing carbon black as a filling agent. The invention solves the problem of extending the field of use of such signal transmitters and is based on the realization that this is attained if the elastic body is arranged so that, when deformed, it will be subjected to bending rather than compression. The carbon black should be of the structure-forming type and present in an optimized concentration interval, generally about 5-15 parts counted on 100 parts of the elastomer.
Abstract:
A bounceless switch apparatus having a junction resistance which varies inversely with the pressure applied normally thereto which includes a first conductor member, a pressure-sensitive layer including a semiconducting material covering the first conductor member in intimate electrically conducting contact therewith and a second conductor member positioned in nonelectrically conducting relationship to the pressure-sensitive layer. The pressure-sensitive layer has a first surface with a multiplicity of microprotrusions of the semiconducting material which provide a multiplicity of surface contact locations. As the normally open switch is closed in response to a pressing force applied to urge the second conductor member and the first surface together, the physical contact between the microprotrusions and the second conductor increases thereby variably increasing conduction between the first conductor member and the second conductor member.