Abstract: A thermostatic valve assembly having a rotatably adjustable insert for varying the throttle resistance of the valve. The insert has a skirt with a spiral shape to effect a first varying cross section for the valve chamber in which the insert is disposed and the skirt also has an inclined section to effect a second varying cross section for the valve chamber.

Abstract: The invention relates to a vapor burner for liquid fuel having an elongated gasifying chamber preceeding a combustion chamber which is heatable to gasifying temperatures by electrical heating apparatus. The gasifying chamber has an inlet for liquid fuel and an outlet for the gasified fuel feeding into the combustion chamber. The gasifying chamber is formed so that no forced air is admissible to the inlet thereof. The heating apparatus heats the gasifying chamber along the length thereof and includes apparatus surrounding the outlet end thereof to form a glow zone heatable to the fuel mixture ignition temperature.

Abstract: The invention relates to a digital control device for an inverse rectifier having controllable switching elements for driving an A.C. motor operable at a variable frequency. The device has a pulse generator for producing timing pulses at a multiple of the frequency of the inverse rectifier frequency and a location counter 26 controlled by the timing pulses. A control store in the form of a ROM has at least two storage zones occupied by different controlling tables of which the data characterizes the periodically changing signal pattern for the ignition and extinction signals of the controlled switching elements of the inverse rectifier. A table selecting apparatus which, depending on setting and operating parameters, delivers a preparatory selecting signal for the desired control table and, after a change in this selecting signal, appropriately switches the storage zone over.

Abstract: The invention relates to a thermostatic valve assembly of the type in which the working element containing the vapor-liquid filling is housed in the temperature setting control knob. A threaded adjusting connection between the knob and an axially moveable unit which controls the compression of the setting spring provides rugged and simple construction.

Abstract: The invention relates to a thermostatic valve assembly of the type in which a working element containing a vapor-liquid filling is housed in the temperature setting control knob. The assembly includes a housing having a projecting portion. There is a threaded adjusting connection between the knob and a base unit which is attachable to the housing projection portion. The invention is directed to specific constructions for attaching the base unit to the projection portion.

Abstract: A method and apparatus for operating a switching device such as a clutch or brake for a moveable element such as a shaft which is driveable by a prime mover such as a rack and pinion device. The clutch selectively connects the shaft to the prime mover and the brake alternately and selectively connects the shaft to the housing. A motor sinusoidally reciprocates the rack by way of an eccentric drive and the rack drives a pinion on the input side of a pneumatic clutch and brake unit. The clutch is always operated in only one direction of movement and the moveable shaft can thereby be intermittently driven in one direction. A continuously rotating motor shaft carries a signal generator disc having a signal generating track in the form of recesses which are scanned photoelectrically. An operating signal which holds the clutch engaged during one half period is received by the signal generator and delivered by a control device.

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: 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 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: 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 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: 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.