Abstract: A relay valve unit having a control pressure communication line for the relay valve equipped with a reducer unit so that when activating the relay valve, any delay is either non-existent or negligibly larger than would be required for the complete opening of the relay valve.

Abstract: An electropneumatic door control, particularly for the control of doors in public transportation, which includes for the purpose of detecting the respective position of the door linear motion sensors (1, 2) which are mounted on the pneumatic door cylinders (4, 5) or on the axes of rotation of the door wings, and whose output signals are evaluated by electronics (3). The electronics (3) include a computer which automatically detects the end positions as well as the motion behavior of the door or obstructions, respectively, and triggers a monitoring function, if necessary. The proposed door control increases reliability and eliminates previously used limit switches and electropneumatic differential pressure switches.

Abstract: In a disc brake, a brake lining support forms a brake ring from one or more support segments, each segment having a lining pad or pads attached to such segment so that the resulting force from frictional braking passes through the attachment device that non-rotatably supports the segment.

Abstract: A multiplex cabling system for controlling electrical apparatus on motor vehicles, which consists of a central transmitter and several area transmitter-receivers, each connected to several controlled devices and/or indicators. Coupling between the central transmitter and the area units is made by a star-arranged line system which consists of a separate, two-wire connecting channel between the central transmitter and each area transmitter-receiver. To further increase the system's reliability and security, the central transmitter includes two microprocessors which are normally assigned to control a different pair of diagonally-opposite area transmitter-receivers. If one processor fails, the other unit assumes full system control.

Abstract: A gear positioning cylinder having forward, reverse, and neutral gear selection provided by a positioning rod attached to a main piston in which an auxiliary piston is telescopically arranged for compactness.

Abstract: A pressure gas generating system including the compressor which is switched to a no-load condition when a predetermined pressure level is reached. The system employs either a regulator or a governor to allow the free exchange of gas between the suction chamber and the compression chamber to prevent the development of high temperatures. In the pressure regulator control system, the opening of the discharge valve is enlarged and is vented into the atmosphere by the pressure regulator so that the compressor continues to operate with reduced drive power and generates less heat during the no-load condition. In the pressure control system, the pressure discharge valve as well as the suction valve are opened during the no-load condition.

Abstract: An electropneumatic door control for vehicles is disclosed which consists of a pneumatic portion and an electronic portion. The electronic portion processes successive commands actuated by the vehicle operator to channel the signals to the pneumatic portion of the apparatus to activate alternate door openings and closings. Any blockage of the door movement is detected and signals processed to reverse the door closing or to halt the opening until the fault is corrected. The electronic portion also assures that the vehicle doors can only be opened after the vehicle has come to a stop, that when the vehicle doors are open the station or parking brake is held engaged, and that an audible warning signal sounds for a predetermined interval before the closing of the door.

Abstract: In a brake actuator device, wear of brake lining, which results in the increase of stroke of the brake actuator device consisting of piston and cylinder, is compensated by an adjuster which functions automatically when the brake is operated. The adjusting process takes place continuously and preferably at the onset of the actuation of the brake. A slip clutch turns the adjuster member which is connected by screw threads to the brake actuator piston to take up slack in the piston stroke. The slip clutch is driven by a rotary member that is in turn operated in response to actuation of the brake actuator.

Abstract: A remotely controlled automotive transmission shifting mechanism for effecting engagement of the respective gears with a force that varies in accordance with the gear selected. Pneumatic pressure from a compressed air storage tank is connected via a choke to a pneumatic actuating cylinder that effects gear engagement. A signal corresponding to the instantaneous pressure effective at the actuating cylinder is compared in an evaluating circuit with a reference value assigned to the gear selected. When the compared signals match, a solenoid valve is actuated to cut off further pressurization of the actuating cylinder and thereby modulate the gear actuating force in accordance with the gear selected. Following gear engagement, the gear actuating pressure is released.

Abstract: An arrangement for providing electrical remote control of several magnetic solenoid valves having a transmitter section and a receiver section. The transmitter includes a fixed frequency signal generator for producing signals having an adjustable duty cycle. The duty cycle of the periodic signals varies in accordance with the position or deflection of an adjustable control lever. The periodic signals are transmitted over a first transmission link to the receiver section for controlling the condition of the magnet valves. A second transmission link is utilized for transmitting digital coded address information concerning which of the magnetic valves is to be selected in the receiver section in accordance with the position of the control lever in the transmitter section.

Abstract: A fluid pressure operated mechanism for a vehicular disk brake which includes two expansion elements capable of moving in opposite directions to each other. A compensating unit located between the two expansion elements to maintain a given stroke of the expansion elements and eliminate excess play which may be developed as a result of brake lining wear. The compensating unit takes the form of a one piece connecting link having return spring portions engaging one of the expansion elements and frictional gripping portions connected to the other of the expansion elements.

Abstract: A valve plate, inserted between the cylinder body and head parts of a compressor, holds the usual compression valve, which opens to connect the compression and pressure chambers during the compression stroke of the piston, and the suction valve which opens to connect the suction and compression chambers during the piston intake stroke. A separate plate-type idle valve also within the plate is positioned to open into a recess of the compression chamber so that there is no interference with the movement of the piston. The idle valve is controlled by an idle piston actuated by pressurized air admitted through a pressure regulator which opens when the reservoir pressure exceeds a predetermined level. Opening the idle valve shifts the compressor operation from compression to idle condition by permitting unhindered passage of air between suction and compression chambers.

Abstract: A gear shift position sensing arrangement for a gear selector unit that selects the transmission gears indirectly. Magnetic sensors are arranged in the gear selector unit housing so as to be activated when a permanent magnet associated with the gear shift lever is brought into magnetic proximity therewith.

Abstract: A gear shift control system for a motor vehicle in which a micro-computer is fed signals representative of the output speed of the transmission and the selected gear position. This information allows the computer to recognize when the engine speed is within an optimum range. A latching mechanism associated with the gear shift lever is controlled by the computer to lock the gear shift lever. Such an arrangement avoids accidental improper shifting on the part of the operator to prevent engine damage due to over or under speeding of the engine, particularly in arrangements where the respective gear positions of the gear shift lever are arranged in line, as opposed to the conventional H configuration. The computer may be stored with several programs that can be selectively activated to vary the locking point of the gear shift lever within the optimum speed range, depending on the intent to operate the vehicle in a "speedy" or "economical" mode, for example.

Abstract: A pressure gas generating system including the compressor which is switched to a no-load condition when a predetermined pressure level is reached. The system employs either a regulator or a governor to allow the free exchange of gas between the suction chamber and the compression chamber to prevent the development of high temperatures. In the pressure regulator control system, the opening of the discharge valve is enlarged and is vented into the atmosphere by the pressure regulator so that the compressor continues to operate with reduced drive power and generates less heat during the no-load condition. In the pressure control system, the pressure discharge valve as well as the suction valve are opened during the no-load condition.

Abstract: An electropneumatic door valve for use with pneumatic door operations as are used on mass transit vehicles. The single valve housing arrangement provides either a through passageway or a throttled passageway for pressurizing the opening or closing chamber of a pneumatic door drive unit. Provisions are also made to allow automatic reversal should the door become wedged, and to allow manual override should that operation be desired. Electrical pulses initiated by the vehicle operator trigger one of two solenoid valves which direct one of two operating pistons into a position to dictate which passageway will be established. Three vent passageways are provided to exhaust compressed air from any of the chambers which had been charged during a previous door operation.

Abstract: Pressurization of closing and opening chambers of a door operator is controlled by first and second magnet valves coupled to the source of air. These valves are alternately energized by a switching network, e.g., a flip-flop, when sequentially actuated to close and open the door. The second magnet valve is biased to its vent position but the first valve is operated to its vent position by air through a double check valve when the second magnet valve is energized. Emergency and choke valves are inserted in series in the air supply to the magnet valves and normally pass air without restriction. Operation of the emergency valve, e.g., door blocked, shuts off air from the magnet valves and diverts that air to inhibit all output from the switching network and, through the check valve in opposite position, to operate the first magnet valve to vent position. Door operation is halted in position.

Abstract: This invention relates to a brake pressure control valve and, more particularly, to a tractor-trailer control valve which includes a differential pressure surface relay piston that on one hand is acted upon by the control pressure from a control chamber and on the other hand by modulated pressure from a working chamber. The brake pressure control valve includes a first combination inlet and outlet valve which works together with the relay piston whereby the working chamber can be pressurized and vented via the first inlet and outlet valves. An auxiliary control chamber which is defined by the differential surfaces of the relay piston is connectable either to the working chamber or to the control chamber via second inlet and outlet valves. The pressure control surface of the relay piston is located opposite the working surface that is acted upon by control pressure in the control chamber. The pressure control surface can be enlarged by the pressure surface of the auxiliary control chamber.

Abstract: The invention relates to a pneumatic relay valve for regulating output pressure in proportion to a control pressure.The relay valve includes a first piston member which is acted on by the control pressure and a second piston member which is acted on by the input pressure.A compression spring is located between the two relay piston members.The strength of the compression spring determines the height of a predetermined minimum controlled pressure even if the input pressure is subsequently lost or drops to a low value.In addition, the output pressure of a receiver can be maintained at a specific adjustable level which may be below the maximum pressure value of the input pressure due to the compression spring located between the two relay piston members.

Abstract: A manually operable quick-release mechanism for use with a spring-loaded brake cylinder including an energy-storing piston operable by fluid pressure to a brake release position with a ball type clutch for locking said piston and a piston rod in said brake release position, and a manually rotatable member effective, when angularly displaced, for releasing the ball clutch and the piston and allowing the piston and piston rod to move to a brake-applying position.