Abstract:
A contactless pressure switch (10) is used primarily in transit vehicle doors and insures reliable operation not found in prior art pressure sensitive switches due to contact contamination and deterioration. The switch (10) includes a housing (36) having first and second chambers (44 and 46). One housing chamber is connected to a fluid pressure system by a sensing tube (30). Each chamber contains a venting port (48 or 50). A diaphragm (42) is mounted in the housing intermediate the ends of chambers (44 and 46). A magnet (52) is secured to the diaphragm switching module (54) is secured within one of the chamber at a position spaced from the diaphragm. A biasing magnet (53) is mounted to the switching module to provide symmetrical switching. The diaphragm is deflected upon the introduction of a pulse or rate of change of fluid pressure. The magnet (52) is moved toward the module causing actuation of a desired circuit. Position of the module may be varied relative to the diaphragm to vary sensitivity of the contactless switch. Increased reliability and operation is achieved by the contactless pressure sensitive switch.
Abstract:
A sensitive edge (10) for door systems, lifts, doors, or other moving portions of transit vehicles that come into contact with articles or passengers includes a contactless switch having a body (28) defining a resilient deformable leading edge portion (30), a base portion (32), an external coupling portion (36) and an internal hollow chamber (34) preferably filled with air at atmospheric pressure. Mounted within the chamber and spaced from one another is a flexible magnet or similar magnetic field creating device (40) and a Wiegand wire and pick-up coil module (38). Alternatively, the chamber may contain plural segmented flexible magnets and modules. Lead wires (42) connect the module to a switch for recycling the door upon the engagement of the sensitive edge with an object. The sensitive door edge switch does not employ the use of electrical contacts or mechanical elements thereby prolonging switch life and reducing maintenance requirements of transit vehicles.
Abstract:
A door operator including a unique electrical drive motor (80) and a linkage arrangement having a drive bar applying driving action through a roller (85) to a slide bar multiplying lever (86) wherein the multiplying lever is pivotally mounted at one end (87) and slidably engaging a roller (92) near the other end which is mounted on a slidable door (90).
Abstract:
A pump drive system (10) for pumping high temperature fluid includes a fluid pump (12) defined by a housing. The pump includes a fluid piston (16) for developing an impulse for pumping the fluid through the system (18). A fluid column (24) is included that is in fluid communication with the high temperature fluid system (20) and the piston (16) of the pump. The fluid column includes valves (54, 56) for introducing and exhausting fluid from the column during the pumping stroke of the plunger. During operation of the pump, high temperature fluid is introduced in the fluid column through the valves, mixed with the fluid within the column and pumped through the valve into the fluid system thereby pumping the fluid while maintaining the temperature adjacent to the fluid piston at a reduced level to insure lubrication of the piston packing (52) while preventing deterioration.
Abstract:
An onboard unit consisting of a tape recorder (11), and associated data handling components (1) utilized to provide records of vehicular operating information including speed, distance (12), power level (27), braking level (31) traction motor current (27) and other control events. Each quantity is associated with an incremental distance and/or time which is fixed. In the case of a rail guided vehicle, location signals provided by ground mounted markers (29, 30) are also recorded. Summation of incremental distances as determined from each marker provides an exact location. A magnetic tape unit (11) provides both data storage and operations instruction for a microprocessor (1) based system, allowing convenient alteration or variations in unit function without internal modification. Each unit retains a unique non-volatile serial number which is transferred to each tape allowing convenient correlation of recorded tapes to onboard units.
Abstract:
An energy storage system for using electrical energy during "off-peak" periods thereby "equalizing" electric generating capacity and improving the efficiency of an electrical utility system employs a heat storage fluid, either liquid or gas, stored in a single elongated master tank (6) and at least one elongated slave tank (7). The master and slave tanks (6, 7) are vertically disposed and are each provided with an electric immersion heater (60, 61) controlled by a temperature controller (52, 52a) and energized during "off-peak" periods by conventional controls to heat the storage fluid to a high temperature. Bottom outlets on the tanks (6, 7) are connected in parallel to the inlet of a variable output pump (25) which circulates the heat storage fluid through the central conduit (22) of a concentric tube heat exchanger (20), disposed coaxially about the lower extremity of master tank (6), and back to the tanks (6, 7) through a tank sidewall inlet. An aquastat (59) responsive to the temperature of heating system water flowing through annular flow space (23) of heat exchanger (20) controls theoutput of pump (25) in accordance with heating system demand. Each tank (6, 7) is provided with a vertical standpipe (53, 54) having an open top (50, 51), a bottom connected to the tank outlet and a small lower orifice (41, 42) located below the tank inlet. The standpipe (53, 54) apportions flow of heat storage fluid between the upper and lower portions of the tank in accordance with pump output and establishes an ascending thermocline in the tank between the heat storage fluid returned through the tank inlet and the higher temperature heat storage fluid remaining in the tank to minimize mixing and temperature dilution therein so that heat can be supplied to the system water at temperatures consistently higher than would be available with the prior art horizontal tank configurations. The disclosed heater reduces piping and weight, eliminates necessity of a thermal mixing valve and minimizes "flashing" of the heated system water.
Abstract:
A pilot operated relief valve for use on medium and high pressure vessels, conduits, and the like A unique two-stage, non-flowing pilot valve (5) operates a main relief valve (7) of substantially greater capacity. In a preferred embodiment the main valve is mounted directly onto the pressure vessel which is to be vented at a predetermined pressure. The pilot is preferably mounted closely adjacent to the main valve for operating communication therewith. A particularly unique ball (16) selector (24, 15, 76) provides means for testing first and second stages without operating the main valve, providing improved set point and reset or blow-down adjustments for the overall combination.
Abstract:
A fluid heating and/or cooling system utilizing heat storage, providing continuous heating or cooling from periodic heal inputs or withdrawals, allowing the utilization of waste heat and the reduction of utility peak energy loads through operation of cooling and heating equipment during pre-determined time periods. In a preferred embodiment, liquid heat storage (10) is utilized connected in a circulating loop (60, 70, 75, 15, 65) with a shell and tube heat exchanger (30), pump (50), and temperature sensitive diverter valve (45). Rapid sensing of demand or load changes in the heat exchanger shell provides quick response to said load by increasing the amount of liquid drawn from said storage. Load requirements are satisfied over a wide range of withdrawal while using storage substantially different in temperature than that required by the load without a reduction in pressure of the demand system and subsequent phase change of the load liquid.