Abstract: An electro-pneumatic door control apparatus for use on public vehicles and including reversing mechanism for changing the direction of door movement, either automatically or operator-initiated, in the event of an obstruction in the door. The control apparatus further includes a flip-flop for recording the position (either open or closed) of the door at all times, a monitoring logic device for recognizing the position of the flip-flop and what type of monitoring function is permitted, a control logic device for picking up the door command and the signal from the monitoring logic device combing them and transmitting them to a valve solenoid control device for energizing respective solenoids of several valve devices by which the appropriate movement of the doors is effected.

Abstract: Apparatus for adjusting a mechanically operable load-dependent braking force regulator including a control shaft having a cam surface for setting the axial position of a push rod which controls a valve for supplying brake-operating pressure according to the axial position of said push rod. The axial position of the push rod is set by the cam surface on the control shaft which is rotated through a lever reflecting the actual vehicle load. The regulator may be set at a location away from the vehicle, such as a test rack, then installed on the vehicle. Thus it is not necessary to transport the testing equipment to the vehicle.

Abstract: A load-controlled brake pressure control unit for vehicle trailers including a load-weighing portion for operating a pressure control valve portion for effecting supply of brake-applying pressure via a relay valve according to vehicle load, a connection whereby brake-applying pressure is simultaneously supplied to the trailer brakes, and an emergency valve portion for effecting an emergency application in the event of separation or rupture of the trailer brake connecting line, all of the portions and components being housed in one casing.

Abstract: A piston cylinder and head arrangement for compressors including a valve plate disposed between a piston housing and the head. An intake valve, a discharge valve, and an atmospheric vent valve are all operably disposed in the valve plate, and are all arranged relative to each other and relative to an intake chamber, a compression chamber, and cooling chambers so as to necessitate only one sealing gasket for sealing said valves and said chambers from each other during certain operational phases of the compressor. The arrangement further includes a piston operable responsively to discharge pressure in excess of a certain high degree for diverting such pressure output from the pressure discharge valve to the atmospheric vent valve until such pressure drops below the certain high degree.

Abstract: An oscillating piston compressor characterized by a spherically contoured piston chamber in which a wedge-shaped disk-like piston is journaled for oscillating motion on an axle journaled in the housing and coinciding with the juncture of a pair of semi-circular sectors forming the piston. A cam formed on the side of the piston opposite the pressure side, is contacted either by a rotating eccentric cam, a crankarm, or a crankpin for imparting oscillating motion to the piston to effect compressing action. A flat circular valve plate, in which intake and exhaust valves are disposed, is fixed transversely in the housing for separating the piston compression chambers from intake and delivery chambers.

Abstract: A trip cock device including a pilot valve actuable by a trip lever, when the train on which the trip cock is mounted passes over a trip arm secured to the track, for causing a release valve in the trip cock to be opened and opening brake pipe pressure to atmosphere, at an emergency rate, for effecting an emergency brake application. Axial displacement of the pilot valve, along with a stem thereon, causes a groove in the stem to be engaged by a detent member for securing the trip cock in open disposition until the detent is released manually.

Abstract: An arrangement wherein fluid pressure passageways opening into inner chambers of a cylindrical housing of a valve device, are formed between abutting faces of two axially aligned cylindrical portions comprising the housing. The opening or passageway between the abutting faces is formed by complementarily engaging saw-like teeth formed around the annular abutting faces of the two housing portions. This arrangement provides a smoother surface over which the sealing gasket on a valve member must ride, thus resulting in less wear and tear on the gasket.

Abstract: A transmission gear selector valve for automotive vehicles combining a range valve, normally strapped on the side of a gear shift lever, and a splitter valve, normally mounted on the gear shift lever in place of the knob, into a single valve assembly, which provides a single valve assembly mountable on the gear shift lever in place of the knob.

Abstract: An electrical switch device manually operable, by a rotatable knob, to a plurality of definable positions for selectively effecting operation of an automotive transmission to a desired gear ratio. The knob and a housing, which includes the switch, may be mounted any place in the vehicle cab within convenient reach of the operator. The switch device is connected to an electronic logic system which monitors the condition of the transmission at all times to either energize or deenergize a lock-out solenoid, which controls a latch mechanism. Depending upon the condition of the transmission and, therefore, of the solenoid, a latch mechanism either permits or inhibits operation of the knob. An override mechanism permits the operator to release the latch mechanism to permit operation of the knob and the switch for shifting of the transmission, in an emergency situation, notwithstanding that the latch mechanism is in a locked position.

Abstract: A change-over valve device having a pair of oppositely disposed control pressure chambers subject to respective control pressures from two independent pressure input systems and operable for diverting the lower control pressure to a delivery chamber so as to increase the degree of the pressure normally delivered from the delivery chamber by an amount corresponding to the degree of such lower control pressure.

Abstract: A hand brake including a lock-up and release clutch mechanism, a ratchet rotatable by a hand wheel connected thereto through a drive shaft, a nut screw-threadedly arranged on the shaft and effective, upon rotation of the wheel and shaft in one direction, for advancing on the nut on the shaft to cause the ratchet to be clamped between respective friction surfaces of the nut and friction plates carried on the shaft. Rotation of the shaft causes rotation of a pinion which, in turn, rotates a gear associated with a chain drum to effect chain take-up and, therefore, application of the brakes. A holding pawl prevents rotation of the ratchet in a release direction. Rotation of the hand wheel in an opposite direction effects release of the clutch mechanism and consequently relaxation of tension on the chain for effecting a gradual release of the brakes. Quick release of the brakes is effected by a lever which, by rotation, causes disengagement of the collar from the pinion.

Abstract: A compound check valve device comprising a housing having a pair of oppositely disposed inlet ports and an outlet port therebetween, a hollow, two-part valve carrier reciprocably operable in the housing between the inlet ports for selectively communicating the inlet ports, singly or concurrently, to the outlet port, and a spring disposed between the two parts of the valve carrier for biasing respective valves mounted on the valve carrier toward respective valve seats surrounding the two inlet ports so that, in the absence of pressure at the inlet ports, the valve carrier assumes a neutral position in which the inlet ports are cut off from the outlet port, and when pressure is supplied to the inlet ports, the valve carrier assumes a position according to the relative pressures at the inlet ports to communicate either both inlet ports or one inlet port to the outlet port.

Abstract: An inhibit lock arrangement for a marine engine controller including a valve-operating shaft axially movable by an operator's handle, when set in a "start" position, for opening a valve whereby a fluid pressure signal is transmitted to the engine to start the engine. Axial movement of the shaft may be blocked by a piston rod actuated by a cylinder when the cylinder is pressurized by a pressure signal indicating an undesirable engine operating or malfunctioning condition. A pair of pivotable latches disposed on each side of the operator's handle for retaining the handle in a neutral position until a release piston is actuated by the operator for releasing the latches and permitting the handle to be moved through a slot but not into the "start" positions until the undesirable condition has been eliminated.

Abstract: A dehumidifier for use in a compressed air system between an air compressor and a storage reservoir for removing moisture from the compressed air supplied to the storage reservoir. The dehumidifier is provided with a moisture-collecting chamber connected to a conventional drain valve which operates automatically periodically for draining the moisture from the moisture-collecting chamber. A high speed fan is installed adjacent the moisture-collecting chamber for subjecting the compressed air passing therethrough to centrifugal force, thereby removing moisture and other foreign particles contained in the compressed air, such moisture being forced by gravity to the bottom of the collecting chamber.

Abstract: An adapter for use in a fluid pressure operable brake system, including a vehicle load responsive brake force regulator, for testing the brake force regulator for pressure leakage. The adapter is so designed as to require a single connection to be made to a source of test pressure rather than the two connections presently if the test pressure source is connected directly to the brake force regulator.

Abstract: A fluid pressure operable jacking tool having oppositely disposed locking arms. With the draft key and coupler removed, the locking arms of the jacking tool, when installed, biasingly engage the coupler cross key slots formed in the draft gear yoke, so that a fluid pressure powered ram of the jacking tool abuts against the draft gear follower. A fluid pressure line is connected to the jacking tool and, when provided with fluid pressure, causes the jacking tool ram head to compress the draft gear to allow removal of the draft gear and jacking tool from the car center sill together. Once removed, pressure is released from the jacking tool to permit separation thereof from the draft gear. If the draft gear is to be installed, a reverse procedure would be employed.

Abstract: A load-dependent braking force control device operable responsively to initial brake actuating pressure for initiating a light brake application until such pressure attains a certain predetermined higher valve, whereupon the control device, which is subject to a control pressure reflecting vehicle load, responds to such vehicle load control pressure for effecting a brake application accordingly. A piston for operating a fluid pressure supply and cut-off valve is subject on one side to fluid pressure supplied to the brake cylinders and on the opposite side to the same pressure communicated thereto via an adjustable pressure-limiting valve device, thereby determining the cut-off degree of the brake cylinder pressure.

Abstract: A clamp-down device whereby an inaccessible portion, such as the rear end of an equipment rack, for example, may be secured to a base or anchor member from the front end of the rack which is readily accessible. The clamping arrangement includes a clamping bar having a wedge-shaped end which fits into a complementarily wedge-shaped slot in a pin secured to the base and extending through the rear end of the equipment rack. A jack-screw is operatively connected between the equipment rack and the clamping bar adjacent the front or accessible end of the rack, so that by turning the jack-screw, the wedge-shaped end of the clamping bar is forced tightly into the wedge-shaped slot in the pin to thereby draw the rear portion of the rack tightly against the base.

Abstract: A compressor cylinder head cast as a single piece casting to include a cylinder bore portion and a cylinder head. The cylinder head is cast with respective recesses for accommodating an intake valve and a discharge valve, such intake and discharge valves being identical in form and shape and, therefore, being interchangeable so that, during assembly of the cylinder head, no particular attention need be given to which valve is placed in which recess.

Abstract: Apparatus for circumferentially crimping the annular opposite ends of a cylindrical overtravel spring housing used in a slack adjuster and for maintaining the overtravel spring assembly in assembled relation and an overtravel spring therein in a compressed state. The apparatus includes a three-jaw lathe-type power chuck fixed to a support frame vertically opposite a power cylinder supported on another portion of the frame. The overtravel spring assembly is placed on a post member, fixed concentrically in the chuck, and held fast by the power cylinder when pressurized. With the spring assembly secured in the apparatus, a plurality of crimping blades carried on the jaws of the chuck are actuated to crimp a first annular end of the spring assembly housing, then removing the spring assembly and turning it over in the apparatus to crimp the other end of the housing, thereby securing the spring assembly in assembled relation.