Abstract: The invention relates to a valve assembly. A 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 which is directly related to the temperature of the liquid phase. 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 to be maintained in the chamber. A pilot valve unit is disposed between the valve closure member and the movable wall. An expansible chamber behind the closure member houses a spring for biasing in a valve closing direction.

Abstract: The invention relates to a cleaning fluid essentially consisting of aliphatic or saturated liquid hydrocarbons and an ethoxylate. The cleaning fluid is a three-phase system consisting of a liquid hydrocarbon which is poor in aromatic content, a wetting agent such as alkyl aryl ethoxylate or alkyl ethoxylate as the second phase, and between the two phases, which are inter-indissoluble, a linking agent consisting of diesterfield monoglycerides of fatty saturated or unsaturated acids. The result is a well-wetting fluid which is poor in aromatic content and does not have an offensive odor but does have a good linking of the hydrocarbon by means of a linking agent which does not cause any inconvenience in the form of skin injuries, eczema or the like.

Abstract: The invention relates to a self-starting electric motor assembly of the type having a permanent magnet rotor, a stator with two windings and electronic switching elements for the windings controlled by switching signals occurring in push-pull and derived from control signals of a sensor detecting the angular position of the rotor. At standstill and for normal running operation the magnetic field distributions between the stator and rotor are selected in a known manner, so that the rotor assumes an angular position which is displaced in relation to the neutral position as an aid to starting and so that the switchover occurs at an angular position ahead of the neutral position to provide greater efficiency for the running operation.

Abstract: The invention relates to a resistor of the type having a resistance which varies with temperature such as PTC and NTC resistors. The resistor is characterized by having three or more connector pads and several different arrangements for the connector pads.

Abstract: The invention relates to an analog computing device for converting a signal x to a different power with a selectable exponent. First and second RC type time dependent transfer elements, having the functions f.sub.1 and f.sub.2 =f.sub.1.sup.b are driven by a square wave generator. The output of the first transfer element is connected to the first input of a comparator and the second input of the comparator is supplied with the signal x of which the power is to be raised to the exponent b. An instantaneous value of the output signal of the second transfer element is scanned and held by a scanning and holding latch which is triggered by the output signal of the comparator which occurs when the signal x and the output signal of the first transfer element are equal.

Abstract: The invention relates to a controlled heating system for maintaining a predetermined or set temperature in a medium of small dimensions which may be a gas, liquid or solid. A single element such as a power transistor functions as a heat transfer device for supplying heat to the medium and as a heat sensing device for sensing temperature changes in the medium which can be fed back and serve as control data for supplying make-up heat to maintain a predetermined temperature. The transistor supplies heat via heat dissipation in its collector-emitter path and senses heat changes via its base-emitter voltage which varies in response to temperature changes in the medium. The controlled heating may be applied to a valve assembly for a refrigeration plant of the kind used for controlling the flow of refrigerant from the evaporator to the compressor.

Abstract: The invention relates to an encapsulated refrigerator assembly of the type in which an integrated motor and compressor unit is resiliently mounted in a hermetically sealed casing or capsule. An oil sump at the bottom of the capsule is provided for lubricating oil. An externally disposed centrifugal separator with an oil collecting tank at the bottom thereof provides refrigerant in vapor form for the compressor and oil for the oil sump. The compressor has an inlet for receiving refrigerant vapor from the separator and the capsule has a single port connected to the separator. A connecting pipe inside the capsule provides fluid communication between the capsule port and the inlet of the compressor. Universal joint fittings at opposite ends of the connecting pipe allow for relative movement between the resiliently mounted motor compressor unit in the capsule and the relatively stationary capsule walls.

Abstract: The invention relates to a housing assembly for electrical equipment which provides for the efficient removal of heat produced by high heat producing electrical components. A perimeter wall has the usual external cooling fins. A divider wall arrangement for forming two or more enclosed spaces provides vertically extending flue passages to create a chimney effect. The divider wall arrangement allows components to be mounted on both sides thereof.

Abstract: The invention relates to a measured value receiver for the polarographic measurement of gases in liquids. The unit comprises a main mounting member having an end face with associated cathode and anode contacts and a carrier member connectable thereto having an end face with cooperably engaging cathode and anode contacts. The carrier member has an annularly shaped wall and a central port member forming an annularly shaped chamber. A diaphragm permitting diffusion of gases covers the end faces of the wall and post member to enclose the chamber. A quantity of electrolyte completely fills the chamber but the diaphragm remains in contact with the post member. The post member extends a further distance outwardly than the surrounding wall so that the diaphragm assumes an inwardly and concavely formed contour. A main purpose of this construction is to make the receiver substantially insensitie to pressure fluctuations.

Abstract: The invention relates to a transmit/receive switching unit for use between a transmit/receive converter and the transmission line of a transmit/receive device having a voltage source. The unit has transmitting and receiving channels with the receiving channel having a signal amplifier. An energy storage element such as a capacitor stores a part of the transmission energy on a continuing basis for operating the signal amplifier in the receiving channel. This scheme saves having to provide a separate line from a voltage source to the amplifier.

Abstract: The invention relates to an electric storage heater assembly which includes a core and a resistance heater for the core. A low tariff period switch and a charging switch are in series with the resistance heater. A triggering unit, which includes an integrator in one embodiment, and an integrator and comparator in a second embodiment, operates the charging switch. A feed circuit for charging the integrator is responsive to the indoor temperature and the unregulated heat loss from the core. A scanning circuit which produces the opposite effect is responsive to the regulated heat loss from the core and the outdoor temperature. The scanning circuit can be connected to either the integrator in one embodiment or to the comparator in the other embodiment.

Abstract: The invention relates to a connecting device for the stator winding of an electric machine such as an electric motor. The winding head is contained within a cover unit. The connecting device is installed within the cover unit and is used for joining the winding ends of the winding head with external heads. The connecting device has a head portion with grooves for receiving the winding ends and leads and a plug-in foot portion which is insertable into the grooves of the stator lamination packet.

Abstract: The invention relates to electrical apparatus for indicating one or more prescribed times of day which occur between the hours of sunset and sunrise. The apparatus is photosensitive and operates in a manner so that the selected prescribed times are determined each day by utilizing detected sunrise and sunset times as the basis for the determination. This determination on a daily basis avoids accumulation errors which occur when the determination is on a cyclical basis as with the use of a clock.

Abstract: The invention relates to a servo motor assembly in which the linkage is provided between a linearly movable motor part and a rotatable member being controlled. The linkage includes two separate links and the arrangement prevents or minimizes lateral reaction forces from being applied to the linearly movable motor part which would cause undue wear on the bearings thereof.

Abstract: The invention relates to a piston and cylinder type servomotor having an expansible substance and a heating element in the cylinder part. The cylinder part is normally movable and may be connected to a valve or the like which is adjustably movable by the unit. The unit has under and over pressure limiting switches which are located in the force transmitting path of the piston part which is the normally nonmovable part but has a small degree of movement which allows it to interact with the pressure limiting switches.

Abstract: The invention relates to apparatus for installing stator coils in an electric motor of the type in which the coil grooves are each lined with groove insulation which projects beyond the end of a stator in the form of turned over collars. In the prior art these collars tend to interfere with or obstruct the installation of coil strands and cover strips for the coil grooves. Rod elements used for installing the coil groove cover strips are formed to extend between and splay apart adjacent insulation collar portions to minimize this interference tendency.

Abstract: The invention relates to a fluid pressure supply system for controlling a servomotor and in particular the forward speed of the servomotor, such as the raising speed of a fork lift truck, independently of the actual loading on the servomotor. This is accomplished with the combination of a pressure responsive regulating and reducing valve and a throttle valve in the supply branch of the circuit. The pressure regulating and reducing valves have setting elements that are loaded in opening directions by desired value springs and by a pilot pressure tapped between the reducing valve and the throttle valve.

Abstract: The invention relates to an electric machine such as a motor having a stator lamination packet with winding heads at opposite ends thereof. A cover for each or either winding head has inner fingers which extend into the grooves of the stator packet and outer fingers with wedge shaped portions which extend between the inner fingers in the installed position. The wedge shaped portions are resiliently mounted relative to the cover proper. The wedge shaped portions have one set of edges engageable with an end face of the stator packet and a second set of relatively inclined edges engageable with the underside of the associated winding head. Circumferentially arranged grooves in the wedge shaped portions hold a ring which biases the outer fingers radially inwardly to bunch the winding head into a predetermined confined space.

Abstract: The invention relates to a control circuit for controlling the speed ratio of a lead motor and a follower motor. The outputs of pulse generators driven by the motors are compared by being fed the positive and negative inputs of a bidirectional counter which outputs a positive or negative value indicative of the sensed speed ratio. A digital/analog converter driven by the counter effectively controls the speed of the follower motor pursuant to the sensed speed ratio.

Abstract: The invention relates to a pressure responsive electric switch assembly of a type used as evaporator thermostats for refrigerators. In this unit an actuating element for operating a switch is held in equilibrium by two springs acting in opposition to a bellows which is connected to a temperature sensor capsule containing a liquid-vapor filling. An abutment arrangement is provided for the springs so that, despite a constantly rising pressure in the bellows, the actuating element operated by the bellows has a zero or null displacement range which corresponds to a substantial intermediate pressure range to which the bellows is subjected by the temperature sensor. As there is no movement by the actuating element in this intermediate range, there is an avoidance of wear which would otherwise be caused by this movement.