Abstract: An electrical conductor clamping apparatus comprising a housing and juxtaposed clamping positions each of which has a clamping member held against rotation in a guide passage. A screw of the clamping member passes through a counterbearing and is held in a receptacle formed by the guide passage and a cover member which defines holes for operating the screwhead. Stiffening of the cover member is obtained in that the cover member is connected to the housing base by way of struts extending perpendicular thereto, allowing the cover member to be comparatively wide without losing its strength. The cover member and the housing are formed in one piece. The clamping members are carried by insert blocks which are received in the clamping positions, securable to the housing by a snap action.

Abstract: The invention relates to a steering assembly having a bidirectional servomotor of the differential piston type which is connectable to steerable wheels. A directional control valve unit has a spool valve with two collars which cooperates with the housing to form first and second end control chambers and a middle chamber. A power circuit supplies pressurized fluid equally to the end control chambers and a manually operable control pump is operable to selectively and incrementally increase and decrease the pressures in the end chambers in a push-pull mode to effect movement of the servomotor piston in either direction. The control valve has two ports connected to opposite ends of the servomotor with one port providing fixed and constant fluid communication between the first valve chamber and one side of the servomotor.

Abstract: The invention relates to a reaction or open center type hydraulic steering control system which is adapted for use with a bidirection differential type servomotor having a piston rod extending from only one side thereof. A loaded check valve in a selected one of the lines to the servomotor compensates for relatively low above atomospheric pressures sometimes present in the line leading from the open center passage of the control unit to the exhaust tank when the control unit is in a neutral position.

Abstract: A gerotor type star and ring gear machine in which control orifices in the star gear alternatively register with ports in the end wall. The star gear is formed from a series of plates and has two sets of control orifices formed therein with one set being diametrically opposed to the second set.

Abstract: The invention relates to a vapor burner having a tubular fuel preparing chamber which opens into a combustion chamber and is heatable to a relatively high temperature. The fuel preparing chamber is cooperable with an air supply system which supplies combustion air. The fuel preparing chamber is formed with ceramic tubes which are heatable to a glow temperature for effecting ignition and effecting a cleansing temperature wherein deposits on the wall of the chamber are burned to ash.

Abstract: The invention relates to a circuit for controllably driving an A.C. motor which includes a voltage supply with a pulse modulation regulator followed by an intermediate smoothing circuit and an inverse rectifier. Each phase of the inverse rectifier has two controllable load switching elements in series between two supply lines with each element being bridged by a recovery diode. The voltage of the intermediate circuit is adjustable by a desired value generator and the frequency of the inverse rectifier is adapted to follow the existing value of the voltage of the intermediate circuit. At least one phase of the inverse rectifier is associated with a braking circuit having a brake resistor between one phase connection and a brake connection which is disposed between two series connected brake switching elements disposed between the supply lines.

Abstract: An incremental digital converter for converting two phase displaced signals of a pulse generator, which signals represent the position and direction of an object moved in two opposite directions, to a parameter which represents the position digitally. The converter includes a reversible position counter and a signal generator which derives from the phase displaced signals a direction signal for determining the counting direction of the counter and timing pulses to be counted by the counter.

Abstract: A refrigeration compressor is provided with a combined sound dampening and centrifugal liquid separator chamber.

Abstract: The invention relates to a valve assembly for a refrigeration plant of the kind used for controlling the flow of refrigerant from the evaporator to the compressor. The closure member for the valve unit is controlled directly or indirectly by a movable wall of an expansible chamber filled with a refrigerant medium having vapor and liquid phases. The pressure exerted by the vapor phase of the medium provides a bias in a valve opening direction which is directly related to the temperature of the liquid phase and is opposed by a spring bias in the valve closing direction. A heat transfer element such as a heating resistor in the liquid phase is heated or allowed to cool in a controlled manner by an external control unit. A temperature responsive sensor element in the liquid phase of the medium is part of a feedback system for the control unit which allows a selected temperature to be maintained in the chamber which results in a desired constant pressure in a valve opening direction to be maintained in a chamber.

Abstract: The invention relates to a control unit for a brushless D.C. motor having at least two stator windings controlled by semiconductor switching elements and a chopper. To avoid having extinguishing current pulses damage the chopper there is provided controls whereby the motor regulating waveform for controlling the chopper is effectively blocked during the active intervals of the extinguishing current pulses.

Abstract: The invention relates to a hydrostatic steering control unit of the type having valving for an open center neutral position which bypasses pressurized fluid from the pump to the tank when in neutral. During a turning operation with a steering wheel the open center valving is caused to close and the pressurized fluid is directed to one side or the other of a servomotor which is connected to wheels to be steered. The open center valving includes orifices in relatively rotatable elements which are aligned in the neutral position and closed to effect the turning operation. Open center valving can be the cause of noise and cavitation and such valving herein is provided with slot shaped orifices and flat generally wedge shaped throttle passages to minimize the noise and cavitation problems. The throttle passages are defined by curved bounding surfaces having rectangularly shaped outlines.

Abstract: A self cleaning vapor burner for liquid fuel in communication with a combustion chamber. The burner includes an electrically heated evaporating tube. The supply of liquid fuel is periodically interrupted to the evaporating tube wherein the tube is heated to a predetermined cleaning temperature to effect deposits on the evaporating tube wall to ash.

Abstract: The invention relates to a hydrostatic steering control unit of the type having valving for an open center neutral position which bypasses pressurized fluid from the pump to the tank when in neutral. During a turning operation with a steering wheel the open center valving is caused to close and the pressurized fluid is directed to one side or the other of a servomotor which is connected to wheels to be steered. The open center valving includes orifices in relatively rotatable elements which are aligned in the neutral position and closed to effect the turning operation. Open center valving can be the cause of noise and cavitation and such valving herein is provided with slot shaped orifices and flat generally wedge shaped throttle passages to minimize the noise and cavitation problems. The throttle passages are defined by curved bounding surfaces having rectangularly shaped outlines. A characteristic of the curved surfaces is that they are formed with exponentially shaped sections.

Abstract: The invention relates to an arrangement for mounting an electrode in a supporting plate. The plate has a hole, a cylindrically shaped fitting having a diameter smaller than the hole and a flange larger than the hole is mounted in the hole. A retaining spring attached to the plate biasingly engages the flange against the supporting plate. An electrode rod extends through a central bore of the fitting. A spring clamps the fitting to the electrode rod.

Abstract: The invention relates to an electrode arrangement mounted in a support plate having a hole. An electrode rod holder with a spherical portion having a diameter larger than the hole is mounted in the hole. A spring coil attached to the support plate presses the spherical portion into the hold of the support plate. An electrode rod extends through a central bore of the holder. A spring damps the holder to the electrode rod.

Abstract: The invention relates to hydraulic control unit for a power steering assembly. The unit is of the type having a metering motor and steering wheel actuated valves for directing metered, pressurized fluid to one selected port of a steering servo-motor and drawing fluid from the other port of the servo-motor to a tank. The invention involves a particular regulating valve for directing pressurized fluid to consumer units when the steering control is in neutral.

Abstract: The invention relates to a cryopump or heat pump circuit having in series a compressor, a condenser, an expansion valve and an evaporator. The expansion valve is controlled as normally by a sensor which is responsive to the superheating of refrigerant at the outlet of the evaporator. In order to assure sufficient dryness of the evaporator output to make the expansion valve operative, the sensor is connected to a heat source which generates a sufficient amount of heat so that the sensor assumes a temperature corresponding to the set superheating.

Abstract: An oil burner system includes a burner nozzle connected to a supply of fuel oil by a nozzle assembly having integrated therein an electric heater for prewarming the oil fed to the nozzle. The nozzle assembly has first connector at one end directly connected to the burner nozzle and a second connector at its other end directly connected to an oil supply conduit. The preheater comprises an elongated rectangular PTC heating resistor having a pair of parallel sides of greater width than the thickness of the resistor and coextensive electrical contacts extending longitudinally and transversely in electrical engagement with the parallel sides. A pair of parallel flattened thin wall metal conduit sections extend coextensively between the first and second connectors and define thin unimpeded generally rectangular cross section flow path for the oil to be heated.

Abstract: The invention relates to a remote control temperature sensor having a capsule containing an expansible material and a capillary tube which connects the capsule to a radiator valve or the like. The temperature sensor has a housing in which the capsule in rotatably mounted and the housing is a wall where the temperature is to be monitored. The capillary tube is wound around the capsule and is dispensible therefrom any desired distance less than the length of the tube to the radiator valve to which the sensor is to be connected.

Abstract: The invention relates to an atomizer burner assembly for oil burners. The assembly has electric heating apparatus for maintaining a relatively constant temperature for the oil supply over a range of throughputs which may vary for different atomizer nozzles, for example, from 0.5 to 2.5 l/h. The heating apparatus includes a PTC resistor mounted in the supply pipe in series with a near zero temperature coefficient heating element which surrounds the supply pipe at a longitudinal position between the PTC resistor and the atomizer nozzle. The PTC resistor controls the heat generated by the heating element in accordance with the temperature of the throughput oil to maintain a constant temperature for the throughput oil.