Abstract: A pneumatic powered door operator including a pneumatic differential engine with an output shaft having a slide bar applying driving action through a roller to a multiplying lever wherein the multiplying lever is pivotally mounted at one end and provided with a roller at the other end and linkage means for interconnecting the multiplying lever to a slidable door. An electropneumatic control circuit controls the operation of the engine and includes a pneumatic spring arrangement which allows manual operation of the door during electrical failure with air available while being capable of maintaining the door in a closed position when not manually actuated.

Abstract: An obstruction sensing edge for a bifolding door includes a body secured to the door. The body defines an internal fluid chamber that is in fluid communication with a fluid actuated switch. The switch controls the opening and closing of the door. Defined on the body portion is an edge portion including a leading edge and side portions extending from the leading edge to the body portion. The leading edge and body portion are fabricated of elastomeric material such that upon engagement of the leading edge with an obstruction, the internal chamber is deformed changing the volume thereof and actuating the switch. The edge portion includes elongated fins extending transversely to the sides of the edge portion such that upon complete closing of the door, the fins seal the door.

Abstract: A data acquisition device used to measure fluid level includes a float coupled to a measuring tape. The float includes a body with a first surface defining a first cross-sectional area and a second surface defining a second cross-sectional area; the second cross-sectional area being smaller than the first. A tube extends from the device to a location above the fluid level. The float is positioned within the tube in an orientation wherein the first surface is parallel to the axis of the tube. The float is then lowered to a point outside the tube and pivoted such that the first surface is transverse to the axis of the tube. The float is then lowered to the fluid surface allowing the data acquisition device to record the fluid level.

Abstract: A power operated rotary valve actuator utilizing a differential drive and magnetic clutch to provide continuous valve positioning between full open and full closed positions. The valve drive motor operates through a differential drive and in conjunction with a single electric clutch provides sequential application of rotational torque to a stored energy spring and the valve shaft. The sequential torque application minimizes drive system torque requirements and insures that sufficient energy is available to return the valve to a preselected position at any time during normal operation.

Abstract: A motor driven actuator, providing continuous positioning of an output shaft, and employing energy storage which allows the shaft to return to a predetermined position on failure of the input power source or other predetermined occurrence. Drive motor torque requirements are minimized through sequential application of input torque to the energy storage and actuator load. This arrangement insures that adequate energy storage for return of the output shaft is continuously available during normal actuator operation including alternate output shaft positioning.When utilized to operate a fluid control valve, the valve actuator combination provides a fail-safe valve which under emergency or other prescribed conditions provides return of the valve to a safe condition from any normal operating position throughout the limit of the valve travel.

Abstract: A fluid distributor for mixing primary and secondary fluids and distributing this mixture to the surrounding environment at a low noise level includes a housing defining first, second, and third chambers. The first chamber is coupled to a source of primary fluid and includes several fluid outlet nozzles that communicate with the second chamber. The second chamber also includes several fluid outlet nozzles in fluid communication with the third chamber. The third chamber, in addition to being in fluid communication with primary fluid across a nozzle, is also adapted to be in fluid communication with a source of secondary fluid. The primary fluid mixes with the secondary fluid and flows out an outlet in the third chamber into the surrounding environment.

Abstract: A vehicular air cooling-ventilating system which provides cooled, filtered, and dehumidified air for the operating cab of a large off the road vehicle in a unitary package usually mounted in the cab overhead. Unit utilizes available hydraulic fluid power for all shaft horsepower requirements. A unique compensated drive system provides operation of the pulsating torque compressor load by a hydraulic motor prime mover. The compensated drive system also provides operation in the presence of pulsating hydraulic fluid pressure commonly encountered in the supply of large vehicles. Internal components are protected from contamination by an air operated vent cover. Additionally, the difficult condensate handling problem caused by motion of the vehicle and consequences of condensate loss in the vehicle cab is overcome through the use of a flow metered baffle design in the condensate receiver.

Abstract: A valve for controlling the pressure within a tank to prevent excessive above or below atmospheric pressure conditions, including a pressure responsive valve and a vacuum responsive valve, wherein each valve includes a pallet with seals and blowdown rings of polytetrafluorethylene material, which is commercially marketed under the trademark Teflon. The pressure pallet includes guide means having Teflon parts, while the vacuum responsive valve includes hinge means having coacting Teflon parts. The breather valve includes structure defining a vertically extending vent structure having an opening arranged alongside the tank in which the valve is mounted, which opening is positioned to avoid being sealed by any normal buildup of ice and snow.

Abstract: A packing assembly for a pump employed to force fluid at a high velocity includes at least one vee shaped packing ring and a graphite ring positioned adjacent to and abutting the packing ring. These rings are maintained as one unit by first and second adaptors to define the packing assembly. The packing assembly is held at one end by a holder and a second end by a packing nut that is adjustable to apply an axial preload on the packing assembly.

Abstract: A solid-state valve actuator control system using three-phase AC motors as prime movers having a summing point with a set point input, a position feedback input and a velocity feedback input. Velocity feedback being produced by differentiating position feedback. Summing point output error signal provides input to each of three integrators. Integrator outputs, synchronized with the three-phase AC power input, supply control signals to an AC solid-state power bridge having as its power input three-phase AC and as its power output controlled three-phase AC to drive three-phase AC motors in the proper direction. For small errors, the AC drive supplied to the prime mover is proportional to the magnitude of the error. For large errors, full voltage is applied to the prime mover. Motor transients are minimized by the proportional band on start-up and on motor reversal.

Abstract: Door operator for doors on a passenger carrying vehicle such as a bus or the like for moving a door between open and closed positions and having a locking mechanism with a lost motion action for unlocking the doors prior to the door opening cycle.

Abstract: A control unit is connected, via a data bus, to a plurality of remote field controllers, each of which is in turn connected to a motor starter and status contacts of a respective valve or pump. Binary codes are communicated between the control unit and field controllers to convey status information, regarding a valve or pump, to the control unit. Likewise, command codes are conveyed from the control unit to a pump or valve to effect a selected operation.

Abstract: The inventive system comprises a magnetic pulse generator mounted on each axle of a railroad car. The outputs from the resulting pulse generators are fed to a detector which compares the speeds of the axles. When wheel slip indicated by a pulse count difference between axles is encountered, the detector operates solenoid-operated dump valves to increase brake pressure on both axles of the slipping axle truck. When axle speed recovers to a non-slipping condition, the dump valves are reset and brake pressure is reduced. The detector circuitry is also able to detect wheel slide thus permitting corrective action. In addition to the above, the system includes provision to prevent synchronous sliding of all axles by sensing the rate of change of count.

Abstract: Apparatus controlling a plurality of fuels of different heat contents to a fluid heater burner including valves for selectively connecting the fuels to the burner and pressure responsive fuel flow regulators responding to the combined fuel/air pressure at the fuel burner to provide a given level of output for the boiler.

Abstract: A ventilating system for a passenger vehicle including a ceiling mounted plenum chamber, a plurality of intake fans for pumping fresh air into the plenum chamber and being mounted in the ceiling, diffusers communicating with the plenum chamber for diffusing and distributing air along the side walls of the vehicle, a plurality of exhaust fans mounted in the ceiling for exhausting air from the vehicle, and exhaust outlets adjacent the floor of the vehicle for exhausting a part of the air being exhausted from the vehicle.

Abstract: Locomotive environmental system to be mounted in the roof of a cab for controlling the environment within the cab which includes a housing having an upper chamber arranged above the roof line of the cab and having one compartment for a condenser unit and another compartment for a compressor unit, a blower in the compartment housing the condenser unit for circulatng air through the condenser compartment and also through the compartment housing the compresser unit, a lower chamber arranged below the roof line of the cab and housing an evaporator unit for the system together with blower means for circulating air through the lower chamber and the cab, wherein the motors for the compressor unit and the blower associated with the condenser unit are driven by the same source of variable power.

Abstract: A locomotive is fitted with a transmit and a receive coil. Resonant circuits are packaged within a housing that is secured at a preselected point along a railroad track to serve as a position marker. When the locomotive passes the marker, a signal is coupled from the transmit coil in the locomotive to the marker resonant circuit and back to the receiver coil in the locomotive. Discrimination circuitry is connected to the receive coil for ensuring that the received signal has a minimum amplitude and a particular phase relationship with the signal in the transmit coil. Further, the received signal must maintain these amplitude and phase relationships for a preselected count. Upon proper discrimination, a "mark" signal is generated to an event recorder on board the locomotive.

Abstract: A drive circuit for an induction motor used in an air conditioning system of a railway vehicle operable from an applied high voltage direct current, which circuit comprises a chopper circuit having its input connected to the high voltage direct current and its output connected to a three-phase variable frequency inverter circuit which, in turn, has its output connected to the induction motor. A voltage feedback is employed to control the current output of the chopper circuit and the frequency of the inverter circuit.