Abstract: A relay valve for use with a railroad car braking system includes a housing in which a control chamber is disposed between a delivery chamber on an upper side and an exhaust chamber on a lower side. A supply chamber is disposed above the delivery chamber. A control piston disposed in the control chamber is reciprocally-movable as a function of the balance of forces acting on opposing sides of the piston. In order to achieve the desired balance of control fluid pressure to delivery fluid pressure, the surface areas of the piston on which these pressures are exerted are equalized by way of a hollow rod extension coaxially-disposed on the piston, and extending from the lower exhaust chamber to the upper delivery chamber.

Abstract: A railway car braking system employing a pneumatic brake to supplement the primary electric brake is provided with a feedback signal corresponding to the effectiveness of the electric brake. This feedback signal is compared with the brake command signal to derive a deficiency signal, in accordance with which the pneumatic brake is applied. A detector senses a change in the deficiency signal in decreasing sense for applying a correction factor to the deficiency signal, thereby compensating for hysteresis typically associated with the various valves in the pneumatic brake system, in order to obtain consistent pneumatic braking for a given deficiency signal during both an increase and a decrease of the pneumtic braking level.

Abstract: A self-lapping type valve device having a construction in which the pressure force acting on the valve assembly is substantially the same when the valve assembly is in a lap condition following either a pressure-buildup phase of control or a pressure-release phase of control, thereby reducing hysteresis heretofore affecting such valve devices.

Abstract: This invention relates to a novel electronic system for controlling a twin-type of air dryer arrangement. Normally, the adsorption elements (DR1) and (DR2) change over their adsorptive and regenerative cycles alternately by an "ON" signal produced by a governor (GO). In addition, in case that the compressor works continuously for a long period of time, the adsorptive and regenerative cycles are changed over whenever a predeterined time elapses. Thus, it is possible to make the entire air dryer more compact, to have less changeover operation and to use the relevant devices for much longer time.

Abstract: A wheel-slip detection system and/or method for implementing self-readhesion or resticking viscous sticking phenomenon after all the wheels of a car have assumed a slipping condition. The detected data are self-retained until all of the wheel speed differences .DELTA.V become smaller than the first speed value .DELTA..alpha.2 regardless of the restoration of all wheel acceleration by the brake release application. Through this method, it is possible to prevent repeated occurrence of any simultaneous gentle or sluggish-slip state of all the wheels when self-readhesion application is not expected so that the increase of brake distance is avoided.

Abstract: A fluid pressure control apparatus for a vehicle includes: an inlet port connected to a master cylinder; an outlet port connected to a wheel cylinder of a brake apparatus for a front wheel; a valve apparatus arranged in a path connecting the inlet and outlet ports; a movable plunger for closing and opening the valve apparatus, receiving fluid pressures at both sides; a first spring for urging the plunger in the direction to open the valve apparatus; an electromagnetic coil to be energized by a signal transmitted on the basis of the driver's operation for driving the vehicle backwards; the valve apparatus including a valve body which can be separated from and slated on a valve seat formed on the plunger; a second spring for urging the valve body to the first position where the valve body cannot contact with the valve seat of the plunger in spite of movement of the plunger; and the valve body being moved by energization of the electromagnetic coil to the second position where the valve body can contact with the

Abstract: This invention relates to a flange-type stop cock having a ball valve plug. This ball-valve stop cock is so constructed as to have the same profile or outline as the flange portion of the existing flange-type stop cock having a conical-shaped valve plug. The flange mounting holes and the input and the output fluid openings are designed to conform with that of existing pipe seat brackets so that the present ball-shaped plug stop cock is a direct replacement for the conical-shaped plug stop cock.

Abstract: In a brake signal converter device for a railway car a first signal conversion circuit is operative in response to a brake signal issued from the control stand of a first car in a form suitable for use by the first car and converts this brake signal to a form suitable for use by a second car and transmits it to the second car, while a first detector senses the brake commands issued at the first car and isolates the first car from these brake commands transmitted to the second car by means of a first switching section. In addition, brake signals issued from the second car are converted by a second signal conversion circuit to a form suitable for use by the first car and are transmitted to the first car, while a second detector senses the brake commands issued from the second car and isolates the second car from these brake commands transmitted to the first car by a second switching section.

Abstract: An automatic tension adjusting mechanism for a winding and transmitting device for an automatic door includes a base fixed in a casing; a mount for a transmission wheel around which a belt is wound; the mount being disposed on the base slidably in the right and left directions where the mount forces the belt to be strained and relaxed, and being resiliently energized at all times in one of the directions where the mount forces the belt to be strained; a saw-toothed stop part provided on the mount and adapted to extend in the right and left directions; and an engagement piece provided on the base and adapted to be moved between an engagement starting position with the stop part and a disconnection position from the stop part; a spring between the base and the engagement piece for energizing the engagement piece in a direction where the engagement piece is engaged with the stop part; a tapped hole made in one of the members of the base and the mount; and a bolt screwed into the tapped hole.

Abstract: A compact, balanced and lightweight air compressor unit for a railroad vehicle which includes a motor-driven compressor, a suction strainer and suction silencer. The compressor and motor are interconnected by an intermediate hollow flanged mounting member which has a cross-sectional dimension that is smaller than the cross-sectional dimension of the motor and compressor. The suction strainer is located in a space between the motor and compressor and is attached to one side of the intermediate hollow mounting member while the suction silencer is located in a space between the motor and compressor and is attached to the other side of the intermediate hollow mounting member to form a substantially balanced structure which is suspended to the underside of the floor of the railroad vehicle by a plurality of resilient bumper connectors.

Abstract: A railway vehicle brake control system in which a fluid pressure brake continuously supplements the electric brake as the electric brake effectiveness fades during vehicle slowdown. An amplifier circuit output signal corresponding to the electric brake effectiveness is modified by adjusting the amplifier gain in response to a detector sensing the initial drop in the electric brake effectiveness. This modified amplifier output signal is subtracted from a brake command signal to obtain a difference signal, the value of which establishes the amount of fluid pressure braking necessary to supplement the electric brake deficiency. The arrangement compensates for hysteresis and response delay in the pneumatic valving required in the fluid pressure brake system, such that the total brake obtained corresponds substantially to the brake command both during and following transition from the electric brake to the fluid pressure brake.

Abstract: A read-convert device for use on an electric brake command car of a railway train having pneumatic brake command cars. A control wire provides the electric emergency brake control on the electric brake command cars, while a brake pipe provides the pneumatic emergency brake control on the pneumatic brake command cars. A cut-off portion of the read-convert device connects a regulated source of pneumatic pressure to the brake pipe when an electric emergency release signal is provided by the control wire, provided a switch valve in the cut-off portion is set for electric brake command operation. Accordingly, an electrically-initiated, emergency brake application on the pneumatic brake command cars can be released through the control wire on the electric brake command cars.

Abstract: A brake control apparatus for a vehicle includes brake apparatus for the respective wheels which are operated by pressurized fluid from a master cylinder; an electro-magnetic valve arranged in a conduit connecting the master cylinder with at least one of the brake apparatus, the electro-magnetic valve being normally in the communicating state and being changed over into the intercepting state by an external instruction; at least one of the brake apparatus being of the disc brake type, the one comprising; (a) a disc rotor; (b) first and second friction pad assemblies for engagement with opposite sides of the disc rotor, the assemblies being guided for movement towards the disc rotor; (c) a caliper body straddling the peripheral edge of the disc rotor and the first and second friction assemblies; (d) an actuating member arranged in the caliper body for urging the first and second friction pad assemblies into engagement with the disc rotor, and (e) elastically deformable retainers for supporting the first and se

Abstract: An equalizer discharge valve for use on a railroad air brake system includes a valve housing having an equalizer chamber formed therein above a brake pipe chamber and separated by a piston, diaphragm configuration. The diaphragm is sealed on the outer circumference by the connection to the housing and on the inner circumference by the connection to the piston. A connecting passage formed in the piston has a check valve disposed therein such that fluid pressure can only flow from the equalizer chamber to the brake pipe chamber. An exhaust valve, disposed between the brake pipe chamber and an exhaust chamber, vents the brake pipe chamber when opened as corresponds to selected venting of the equalizer chamber fluid pressure. A back pressure chamber and piston configuration is formed above the equalizer chamber such that fluid pressure from the exhaust chamber can be communicated thereto to counterbalance the force on the piston exerted from the brake pipe side during an exhaust operation.

Abstract: An air dryer device for drying compressed air includes a base member, a housing mounted on the base member, and an air dryer disposed within the housing. The air dryer includes an absorbent container of a synthetic resin holding an absorbent material and disposed in spaced relation to the housing to form a space therebetween. The base member has an inlet, an outlet and a passage. The compressed air applied to the inlet flows through the passage, the container, the space to the outlet. The container has a peripheral flange at a lower end thereof. A lower end wall of the container and the flange defining a bottom of the container. A plate is embedded in the bottom of the container. Fastening elements pass through the flange and the plate into the base member to fasten the container to the base member.

Abstract: A master cylinder includes a cylinder of one-piece construction made of a synthetic resin and including a cylinder body having an axial internal bore therein. At least one mounting flange extends perpendicular to an axis of the cylinder body, the mounting flange being adapted to be secured to a support structure to mount the master cylinder thereon. A plurality of ribs are formed integrally with and extends radially outwardly from the outer peripheral surface of the cylinder body in circumferentially spaced relation, the ribs also extending along the axis of the cylinder body. The mounting flange is connected to radial outer ends of the ribs. A piston received in the internal bore for sliding movement therealong.

Abstract: A pull-type booster for a vehicle includes a main body having an internal space; a movable body including a head portion and a cylindrical portion formed integrally with the head portion, the head portion being arranged in the internal space and partitioning the internal space into a lower pressure chamber at one side and a control chamber at another side, and the cylindrical portion projecting from the main body at the other side; a through hole formed in the movable body; a pull input rod extending across the lower pressure chamber and projecting through a seal assembly from the main body at the one side; the seal assembly including a seal member fixed to the main body at its outer circumferential portion and fitted to the pull input rod at its inner circumferential portion; a more flexible portion formed between the outer circumferential portion and the inner circumferential portion in the seal member; a plunger arranged slidably in the through hole and combined with a head portion of the pull input rod; a

Abstract: A pull-type booster for a vehicle includes a main body having an internal space; a movable body including a head portion and a cylindrical portion formed integrally with the head portion, the head portion being arranged in the internal space and partitioning the internal space into a lower pressure chamber at one side and a control chamber at another side, and the cylindrical portion projecting from the main body at the other side; a through hole formed in the movable body; a pull input rod extending across the low pressure chamber and projecting through a seal member from the main body at the one side; a plunger arranged slidably in the through hole and combined with a head portion of the pull input rod; a valve member arranged in the through hole and operated by the plunger for generating pressure difference between the lower pressure chamber and the control chamber and moving the movable body in the direction of the lower pressure chamber, a power transmission assembly arranged in an opening end portion of

Abstract: A liquid pressure operated braking system comprises a valve assembly with a first valve operatively coupled to a clutch pedal for confining the liquid pressure applied to the associated group of wheel cylinders when the clutch pedal is depressed and a second valve. The second valve includes a stepped piston having a large pressure acting area and a small pressure acting area and an elastomeric valve body adapted to close a valve bore when the stepped piston assumes a predetermined position. The valve body defining a third pressure acting area when the second valve is closed which is exposed to the liqiud pressure in the valve bore. The valve bore is connected to the associated source of liquid pressure, i.e., a tandem master cylinder.

Abstract: A master cylinder reservoir includes a cylindrical body having an open upper end. A cap is fitted on and removably secured to the body, the cap engaging the open end of the body at a lower end portion thereof. The cap has a mounting portion formed adjacent to the lower end portion thereof. The mounting portion defines together with the upper surface of the open end of the body a circumferential space. The mounting portion has a first surface disposed in opposed spaced relation to the upper surface of the open end of the body. The mounting portion has a second surface disposed in opposed relation to the outer surface of the upper end of the body. The outer surface of the upper end is spaced from the second surface adjacent to the upper surface of the body to form a circumferential recess. A diaphragm received in the cap and having a peripheral portion received in the circumferential space and held between the first surface of the mounting portion and the upper surface of the open end of the body.