Abstract: A digital speed detecting circuit of the type in which pulses of a clock frequency are counted during a time interval of a cycle of the sinusoidal signal obtained from a sensor of the rotating member whose speed is being measured. The pulse count throughout the speed range of the rotating member is adjusted to be within a range best suited for accurate evaluation, since the pulse count exceeds this range at high and low speeds. This is accomplished in a first embodiment by shifting to a different counting frequency in different speed ranges and correcting the speed signal obtained by a factor corresponding to the degree of frequency change. In a second embodiment, the counting frequency is monitored and adjusted each cycle of the sinusoidal signal by comparing in a shift register the stage of advancement of a binary counter that produces the pulse count with a reference stage establishing the upper limit of the evaluation range.

Abstract: A vehicle load-controlled brake pressure regulating valve device which combines in one housing a unitary valve device performing dual functions of a vehicle load responsive control valve and of a relay valve, whereby the relay valve function is effected by pressure regulated by the vehicle load function. The dual purpose valve device functions as a unit in a single housing to thereby reduce manufacturing costs and installation space required.

Abstract: A brake cylinder device including a brake piston operable by a spring force to an application position and to a release position in response to an opposing fluid pressure force, and a fluid pressure operable locking device operable responsively to release pressure for locking the piston in the release position and for delaying such locking of the piston in the release position during normal operations to prevent untimely locking-up of the piston.

Abstract: A two-circuit brake system, operable either pneumatically or hydraulically, for motor vehicles including an operator-controlled brake valve for effecting supply of brake-operating pressure via a vehicle load-responsive device for regulating brake-operating pressure to the rear axle according to vehicle load, and a relay valve responsive to such regulated pressure for effecting supply of brake-operating pressure to the front axle according to a predetermined ratio. The relay valve includes certain pressure area members which may be replaced by others for varying the rear axle to front axle braking-pressure ratio to suit the particular vehicle on which it is used, and the operator-controlled brake valve is operable for maintaining effectiveness of at least one of the brake circuits, either front or rear, in the event of failure of the other.

Abstract: A bellows type sealing member for sealing off a piston rod opening formed at one end of an operating cylinder for accommodating reciprocal movement of a piston rod therein, in particular a diaphragm type cylinder for vehicle air-brake systems, wherein the piston rod has one end connected to a diaphragm disk and is provided at the other end with a forkhead, and the bellows can be sealingly fitted on a sleeve-like support member mounted coaxially in the piston rod opening of the diaphragm cylinder.

Abstract: A fluid pressure operated disc brake having one brake disc affixed to the housing of a brake cylinder unit and the other disc affixed to a service brake piston of the brake cylinder unit, which further includes an auxiliary brake piston between the service brake piston and cylinder head, thereby forming on opposite sides thereof a service brake actuating chamber and an auxiliary brake actuating chamber to which fluid pressure may be admitted via separate service and parking brake valve devices. A filling piece disposed between the brake cylinder housing and auxiliary piston is operatively connected with an actuating cylinder to which the parking brake valve also supplies auxiliary brake pressure to operate the filling piece following an auxiliary brake application, thereby mechanically locking-up the brake discs in the brake application condition to provide a parking brake.

Abstract: A test circuit periodically emits a test control signal as long as the vehicle speed exceeds a preselected value and there is no antiskid brake control action. The test signal causes a frequency control circuit to decrease the frequency of a sensor signal that indicates the rotating velocity of a wheel of the vehicle, thereby simulating a wheel deceleration sufficient to obtain wheel behavior signals from the antiskid brake control system. A logic sensing circuit then reacts to these wheel behavior signals to suppress production of an error signal, which otherwise occurs after a predetermined delay period to indicate a defect in the antiskid brake control system.

Abstract: An antiskid control system for a vehicle in which acceleration and deceleration control signals are generated by a control circuit in accordance with the rotational speed of a wheel monitored by a sensor device that produces a pulse train whose frequency varies with wheel speed. A digital counter operates for the duration of each pulse cycle of the sensor signal whereby the pulse count obtained represents a cycle duration of the sensor signal. Within the control circuit to which the sensor signal is supplied, a control unit transfers the pulse count after each cycle to a first shift register as a measure of the cycle duration. The first shift register outputs the pulse count of the measured cycle duration to a comparator to which there is also connected a pulse count of a reference cycle duration supplied by a second shift register to which the pulse count of a previous measured cycle duration has been supplied by the first shift register to form the reference cycle duration.

Abstract: The invention relates to an automatic load-dependent brake power regulator for motor vehicles and trailers in which the regulator automatically assumes a condition to provide a braking force for a half-loaded vehicle in the event the regulator control linkage between the regulator and vehicle axle should break.

Abstract: A checking circuit for periodically monitoring the electronic operating reliability of a vehicle antiskid control system during periods of operation, as well as prior to operation, by injecting a periodic test pulse into the system control channel. An evaluation circuit detects the transmission of the test pulse by the control channel and output amplifier as an indication of the ability of the electronic devices to effect a subsequent energization of the system modulator valve at the time of de-energization thereof, or de-energization of the system modulator valve at the time of energization thereof. A warning device is activated in the absence of a test pulse transmission within a predetermined time duration following generation thereof.

Abstract: A signal multiplier circuit in which a sinusoidal input signal corresponding to the angular velocity of a rotating member, such as a vehicle wheel, is connected directly to one input of each comparator of a positive and a negative polarity responsive network. The sinusoidal input signal is concurrently connected to the other input of each comparator via a signal modifying circuit whose output deviates from the sinusoidal input signal, consequently effecting operation of the respective comparators a predetermined number of degrees beyond the positive and negative transitions of the sinusoidal input signal. Each comparator output is thus phase displaced relative to the other and is connected via logic circuits which provide a signal whose polarity alternations are a multiple of the sinusoidal input signal generated to thereby provide a more accurate response of wheel anti-skid signal sensing circuitry at low vehicle speeds.

Abstract: Each pair of two pairs of terminals is connected by a conducting strip formed of a metallic material deposited on a fragile support block. The terminal connectors are shaped in an interwoven pattern, with an intervening space, such that the support block will not break along the space pattern. The connector strips are connected by a resistance material deposited along the space pattern and overlapping the adjoining strips. The four terminals are connected into a circuit arrangement so that the resistance material forms part of a vital resistor network which if interrupted causes that circuit arrangement to assume a safe condition. Any rupture of the resistance material and/or the support block due to thermal differences or mechanical force interrupts the continuity of one or both connector strips to create a safe failure condition.

Abstract: A combined vehicle antiskid and load-dependent brake control system in which digital control of the individual wheel brake pressure regulating valves is provided. These regulating valves may be operated individually or on a per axle basis to vary the brake pressure independent of the operator-controlled brake valve device. The load-dependent brake control portion of the system includes electronic control circuitry that is subject to the output signal of sensors, which monitor pressure supplied by the brake valve device, actual brake cylinder pressure and the load supported by the vehicle rear axle, in order to operate the regulating valve of at least one wheel brake cylinder such as to cause the wheel brake pressure to follow a predetermined curve that differs from a normal brake pressure buildup curve.

Abstract: An antiskid brake control system in which an electronic evaluation circuit subject to dynamic behavior signals produced by a wheel sensor associated with one wheel of an axle controls modulator valve device in the brake cylinder fluid pressure conduit to adjust the brake cylinder pressure at the sensed wheel as well as at the non-sensed wheel of the axle independently of an operator controlled brake valve device. There is provided in alternate arrangements of the invention an electrical delay element via which either the supply or exhaust valve comprising the modulator valve device associated with the non-sensed wheel is controlled so that the non-sensed wheel brake pressure development is inhibited relative to the sensed wheel brake pressure to provide better stability of the non-sensed wheel.

Abstract: A brake cylinder device for railway vehicles including a built-in automatic slack adjuster and a manually axially positionable piston for resetting the piston and piston rod relative to the slack adjuster when necessary, such as when replacing worn brake shoes, the piston rod being interconnected through a nut and screw, friction clutch, and a key to a manually rotatable member, which, when rotated causes axial displacement of the piston rod and piston to desired adjusted position relative to the slack adjuster.

Abstract: A wheel anti-skid brake control system for an automotive type vehicle in which diagonally opposed wheels on different axles of the vehicle are provided with a sensor device whose output signals represent different dynamic wheel behavior conditions. An electro-pneumatic modulator valve is operative in a common line via which fluid pressure is delivered to each brake cylinder device of an axle or in a separate line connected directly to each individual brake cylinder device of the axle to influence the brake pressure delivered to each brake cylinder via an operator's control valve device in accordance with the output signals of the sensor device of one wheel of the axle, as monitored by an evaluation circuit to which the modulator valve or valves of the axle are operatively connected.

Abstract: A measuring sensing device for generating a signal corresponding to the relative rotation between two construction parts, with a rotor arranged on the rotating construction part and a stator borne on the fixed construction part, the stator being supported by one or more clamping bodies on the fixed construction part in such a way that on overcoming a considerable frictional adhesion it is slidable with respect to the fixed construction part.

Abstract: In an anti-skid brake control system for a wheeled vehicle, an electronic circuit for generating a wheel speed signal in accordance with the time duration of a half cycle of a sinusoidal waveform generated by a sensor that detects the presence or absence of teeth of a rotor that revolves with a wheel of the vehicle is arranged so that the measured time duration of both a positive and a negative alternation of the waveform is utilized to obtain accurate wheel skid control at relatively low speeds. Slight differences in the measured time duration of a positive and negative half cycle due to slight variations in the dimensions of a tooth and adjacent space are sensed and modified as required to assure correspondence between the measured time durations in order to avoid false sensing of a wheel skid condition.

Abstract: A vehicle load responsive linking device for controlling operation of a brake pressure regulator in effecting supply of pressurized fluid to the brake system at a pressure commensurate with the prevailing vehicle load, and including a fulcrumed lever for actuating the brake pressure regulator according to a resultant force of a pair of opposing spring forces exerted thereon by respective tensionally opposingly disposed springs having adjacent ends secured to the lever and the opposite ends secured to sprung and unsprung portions, respectively, of the vehicle, the distance between the sprung and unsprung portions, as determined by the vehicle load, determining the tension of the springs, which tension acts to dampen and isolate axle vibrations from the pressure regulator device.

Abstract: A safety valve device for use in a multiple circuit fluid pressure operable brake system for insuring supply and preservation, in the event of fluid pressure failure in one or more of the circuits, in the remaining circuits for assuring, at least, limited operation of the brake system.