Abstract: The present differential pressure limiting valve is constructed with an axially movable valve body having hydrostatic bearings including bearing shafts, whereby the bearing shafts are connected to opposite sides of said valve body in axial alignment. Normally the valve body is biased against the valve seat by an adjustable closing spring acting on the bearing shaft or valve body opposite the valve seat to close the valve. In addition, the face end of the bearing shaft opposite the valve seat may be loaded by a pressure medium. The respective diameters of the bearings may differ. However, the effective cross-sections of the valve body are preferally equal on both sides of the valve seat.

Abstract: The present mechanical chucking device especially for a testing apparatus, has a friction reducing layer interposed between the clamping members and a base plate and another friction reducing layer interposed between the base plate and securing elements for the clamping members, whereby said clamping members may slide within a given range along the base plate without having to release the securing elements holding said clamping members to the base plate. The clamping members are driven by a spindle movably held in a guide block on the base plate which allows an exact concentric clamping of the sample.

Abstract: This invention relates to an arrangement for engaging the relative elevation of two intersecting trackways for conveying and transferring freight goods in two conveying directions. One of the conveyors has rollers for engaging the flat bottoms of the freight bins and the other has flat tracks for receiving the wheels which project a short distance below the bottoms of the bins. The flat tracks are disposed at an elevation which is high enough to use the flat bottoms of the bins to clear the rollers in the intersecting conveyor. The portion of the tracks which intersects the roller conveyor is movable downwardly on eccentric cams a sufficient distance to drop the bins on the rollers to accomplish the transfer. Raising the flat track portion on the cams accomplishes transfer in the opposite direction.

Abstract: A vibration bed (1) is assembled together of a plurality of rigidly connected frames (2) extending in the feed direction (A) of the material to be burned. The frames have projecting sides (10) extending downwardly and in the feed direction. Two effectively synchronously driven vibration generator arrays (12, 13) are located on the downwardly extending projection or extensions, each one of the arrays (12, 13) has a plurality of axially serially arranged vibrators (7); preferably, every other frame has a vibrator associated therewith, and the number of frames is odd, the vibrators of one group being connected by a continuous shaft, energized by a drive from the axial ends.

Abstract: This invention relates to a roller conveyor and its track. Several inverted U-shaped supporting tracks are provided in sequence, which carry flanged rollers projecting above them. Alignment is secured by milling right-angular flats on the edges of the U-shaped track and shaft of the rollers which mate with each other and by providing relatively elongated bolt holes in the side mounting plates of the roller assemblies.

Abstract: The production of a mat of wood chips and/or fibers, hereafter called wood particles, by a spreading station and a weighing device, is controlled in a closed loop circuit for uniformity, directly during the spreading of the wood particles. Several spreading devices form a spreading station. Electrical signals emanating from a tared weighing device which is arranged downstream of a first spreading device as viewed in the direction of travel of a conveyor belt, are used to control the output of the first spreading device. If desired, the output of one or more spreading devices located downstream of a weighing device may also be controlled in a closed loop circuit, whereby the weight of the partially formed mat moving over the weighing device produces the electrical control signal which is compared to a predetermined reference signal for controlling the production of the finished mat having one or several layers.

Abstract: The leakage flow of a pressurized medium in gap type seals is controlled by a suction device at the sealing location of the gap seal. The suction device comprises a jet pump. The jet pump is driven by the pressurized medium in the gap seal or by an externally supplied fluid medium.

Abstract: A wheel balancing machine is started by operating a timing switch to transmit reset signals to a synchronous counter, revolution counter, a divider and an average value counter. The reset signals are then terminated concurrently with the first zero crossing of the imbalance value signal derived from the body to be balanced. The synchronous counter is provided with incremental pulses containing angular information corresponding to the imbalance. After a first pulse sequence corresponding to a 180.degree. angle of revolution of the body to be balanced and further pulses at angles of 360.degree. at the output of the synchronous counter, 180.degree. pulses are supplied to a revolution counter and also are conducted by means of a differentiating member to the reset input of a flip-flop, whose set input is affected via a further differentiating member by unbalance representing pulses.

Abstract: The present test apparatus provides for the simultaneous loading of a test sample with longitudinal forces and with torque. For this purpose a piston rod of a longitudinal loading cylinder and a piston of a torque cylinder are coupled for relative axial movement by a fork connected to the piston rod of the longitudinal loading cylinder and guided in a torque transmitting member connected to the piston of the torque cylinder. Frictional forces and play are minimized by providing the fork ends with bearing surfaces and providing the torque transmitting member with both stationary and tiltable bearings which may be adjustable. Another embodiment provides that the bearings of the torque transmitting member are hydrostatic bearings to further reduce friction.

Abstract: A dynamometer is connected to a foundation by two pairs of leaf springs. One end of the leaf springs is firmly connected to the dynamometer and the other ends are connected to the foundation by pivot joints, which absorb rotation, oscillation and axial movement. The pivot joints are advantageously constituted by metal and rubber components.

Abstract: The invention relates to a process and a device for the digital indication of the extent of unbalance of a part to be balanced in at least one plane when measuring its unbalance in balancing machines. An alternating voltage corresponding to the extent of unbalance is supplied to an integrator. A reference voltage is supplied to cancel out the output voltage of the integrator. While the integrator is being returned to zero, pulses are supplied to a counter which is thereby actuated to display the extent of the unbalance in digital form.

Abstract: A hydraulic eddy brake has a rotor and a stator both forming an eddy chamber. Liquid supply conduits lead to the center of the eddy chamber. The rotor shaft is sealed relative to the housing formed by the stator. The sealing is accomplished by noncontacting sealings. Leakage liquid is discharged to respective chambers located between the bearings and the eddy chamber proper. A gap is provided between the shaft and the housing. This gap is connected with the center of the eddy chamber through a liquid feedback which may include an intermediate chamber and respective liquid feedback conduits whereby the pressure at the point of leakage is minimized. Such brakes are used as absorption dynamometers to measure torque.

Abstract: The balancing position of a wheel is designated by light signals which light up at closer intervals as the balancing position is approached in either turning-in direction. Such light signals upon approaching the balancing position include: a first signal in the range of approximately 180.degree. to 90.degree., another light signal in the range from about 90.degree. to 22.5.degree., a further light signal in the range of approximately 22.5.degree. to 1.4.degree.. Upon reaching the balancing position still a further light signal lights up between about 0.degree. and 1.4.degree.. A model representing the part to be balanced carries a series of light signals in both turning-in directions for each balancing plane provided by balancing apparatus.

Abstract: A method and apparatus for deriving mean value signals is disclosed, wherein input signals are compared with signals stored in a first storage device to produce difference signals. These difference signals are added to the signals stored in the first storage device, to produce corrected means value signals, which are in turn stored in a second storage device. The output of the second storage device is transferred to the first storage device, to update the mean value stored in the first storage device.

Abstract: The present testing apparatus for vehicle axles, wheel suspensions, and similar structural components permits the applying of several forces to the test sample. The testing forces or force components are effective in different directions and may involve vertical forces, longitudinal forces, and lateral forces. The force applying elements are connectable to the test sample either in a rotatable manner or in a manner rigid against rotation. Actuating and force transmitting elements are effective at least at one force introducing point forming part of said force applying element or elements. At least one force transmitting element is not directly connected to a force introducing point, but rather, it is connected to an intermediate lever. The intermediate lever in turn may be constructed for transmitting a further force component to said force introducing point.

Abstract: A method for the multiplication of electrical signals comprises modulating the signals to be multiplied with functions having positive and negative values, multiplying the modulated signals together, demodulating the resulting product with demodulation functions which are the reciprocal of each modulation function, and then averaging the demodulated signal. The modulation circuit comprises an inverter, control signal gated FET's, and an operational amplifier of which the output is the desired modulated signal. A circuit comprising a shift register and an Exclusive-Or gate provides statistical alteration of the cycle duration of the modulation and demodulation functions.

Abstract: A clamping arrangement for clamping vehicle wheels against a rotatable counter plate of a test apparatus. A clamping plate is adjustably movable toward the counter plate. Clamping pins are mounted on a pressure plate and adapted to extend into and engage a mounting hole in a vehicle wheel. In order to enable the rapid alignment of a vehicle wheel in the apparatus, while assuring positive clamping, guide pins to the pressure plate. The ends of the clamping pins are contoured to enable them to fit the mounting holes of different diameters.

Abstract: A method for determining a vector component of an oscillation such as an oscillatory signal comprises applying the measured analog oscillatory signal to the calibration voltage input of a multiplying digital-to-analog (D/A) converter, and simultaneously applying a digital reference signal to the digital input of the digital-to-analog converter. The reference signal includes sine or cosine values of an oscillation suitable for the vector component determination and having a frequency corresponding to the frequency of the oscillatory signal to be determined. The analog output of the D/A converter is then further processed to ascertain the desired vector component. The circuit arrangement for practicing this method comprises a multiplying digital-to-analog converter and a binary counter which sequentially addresses a digital memory used to provide the digital reference signals. The binary counter is controlled by a reference signal generator.

Abstract: The unbalance angle is transformed into units of length or into non-dimensional units which are correlated to the body to be balanced, either to a circumference thereof, or to a characteristic scale of the body to be balanced. The unbalance position may then be displayed in such units. The apparatus for performing the method includes a transformation computer which transforms the measured angular value through at least one operant. Preferably, the apparatus also includes an indicator device for units of length or for non-dimensional units or angle representing units.

Abstract: Materials, or structural components are tested under resonance conditions by means of a pressure operated load mechanism controlled by a servo-hydraulic control unit. The pressure medium is part of the oscillating system. The spring rate or stiffness of the pressure medium is adjusted relative to the spring rate of the test sample, or rather relative to the spring rate of the entire oscillating system in such a manner that the maximum pressure occurring at resonance operation corresponds as close as possible to the rated supply pressure of the system. The load mechanism comprises a single cylinder for producing dynamic loads for the resonance operation and also static loads of substantially the same size as said dynamic loads.