Abstract: The invention relates to an electric snap switch assembly which includes a stiff arm which is pivotal about a fixed axis abutment and is movable in a range between two operative positions. A sheet metal hinge member extends the length of the arm and is attached to the fixed axis abutment and to the arm. A sheet metal spacer member is attached to a movable abutment and a U-shaped bow spring straddling the movable abutment is maintained in a compressive state with one leg thereof attached to the free end of the hinge member and the other leg thereof attached to the movable abutment member. A pivotally mounted adjustment member carries the movable abutment.

Abstract: The invention relates to a single phase asynchronous motor having a main winding branch and an auxiliary winding branch for starting. The auxiliary branch has a first section having a first winding and a second section having a second winding and a capacitor in series. The second branch has a PTC resistor in shunt with the second winding and capacitor combination. This arrangement with the PTC resistor facilitates a design which involves selecting the number of turns and the resistance values of the auxiliary windings so that an optimum starting torque can be achieved at the cold temperature of the PTC resistor and a high breakdown torque can be achieved at the hot temperature of the PTC resistor.

Abstract: The invention relates to a starting device for an asynchronous motor in which device a capacitor and a PTC resistor form a series circuit. A housing has three chambers formed by two interior walls and a cover. The capacitor is in one end chamber, the PTC resistor in the middle chamber, and the lead ends which are connectable to a motor winding in the other end chamber. The PTC resistor is subject to heating and the housing has vent holes for ventilating the middle resistor chamber.

Abstract: The invention relates to an encapsulated motor compressor assembly for refrigerators. An integrated motor compressor unit is resiliently supported inside the casing of the assembly on helical springs which engage the lower side of the stator laminations. The points of spring engagement are in a lower plane in which it is desired to prevent or minimize radial deflection of the motor compressor unit. This is accomplished by placing certain constraints on the design of the vertical motor shaft which has the usual eccentric crank for driving the compressor piston and a compensating weight for balancing the centrifugal effects of the crank. It was discovered that certain relationships between (1) the mass of the compensating weight and the spacing of its center of gravity from the shaft axis, and (2) the mass of the eccentric crank and the spacing of its center of gravity from the shaft axis, are in fact effective to minimize radial deflection of the motor compressor unit in the above referred to lower plane.

Abstract: A charging apparatus for an electric storage heater includes a resistance heater in series with a low tariff time switch and a charging switch. While the low tariff time switch is closed, usually at night, an integrator controlled by a differential amplifier controls the charging switch in accordance with the total charge accumulated by the integrator which reflects the use of energy during the preceding day. The charge of the integrator at the end of the day is the result of it being intermittently charged and discharged by a voltage divider circuit which has one or more temperature responsive resistances and transmits a voltage to one input of a differential amplifier for the integrator which can be above or below a reference voltage on the other input of the amplifier.

Abstract: The invention relates to apparatus for ultrasonically measuring physical parameters of flowing media. A measuring path has two ultrasonic converters with transmitting and receiving devices being connected to the converters. The path has at least one component in the direction of flow and over which ultrasonic signals are sent alternately upstream and downstream. A comparator unit connected to the receiving device has an input for a reference signal from the control unit applied thereto at a predetermined time after the time of the transmitter starting signal. The comparator unit generates early or late signals when arrival signals from the receiving device come in earlier or later than the reference signal. A first signal level generator connected to said comparator unit produces a first main signal related to the velocity of sound in said media. A second signal level generator connected to the logic circuit for producing a second auxiliary signal related to the flow velocity of said media.

Abstract: The invention relates to a cable clamp assembly of the type used for fastening electric cables to machinery frames. The assembly has two main parts which are (1) a body member having two slotted openings formed in part by thin flexible wall portions and (2) a base plate attachable to the body member with the resilient portions on the one hand functioning to provide a locking engagement between the body member and base plate and on the other hand being rigidly supported by the base plate. Prior to fastening the base plate to the body member cables may be inserted laterally into the openings by bending the resilient wall portions to sufficiently enlarge the slots to permit the lateral entry of the cable into the opening. The base plate is then fastened to the body member, or vice versa, and the whole assembly is then attached to the frame or casing of a machine. A set screw arrangement is provided for fastening the cable securely in the slotted opening into which the cable was inserted.

Abstract: The invention relates to apparatus for heating and/or cooling a room which is large enough to require at least two heat exchanger units. Controls are provided which dependingly relate the outgoing air stream temperatures of the heat exchangers to avoid the causing of drafts in the room. One of the heat exchangers is a guide unit and all others are follower units. Each heat exchanger has its own individual control such as a valve for admitting heat exchange fluid to the unit. The guide unit has associated room temperature sensor and setting devices for controlling its individual control. Each follower unit has a pair of temperature sensors for jointly controlling its associated individual control. One sensor of each pair is in the outflowing air stream of the guide unit and the other sensor of the pair is in the outflowing air stream of the associated follower unit.

Abstract: The invention relates to refrigeration apparatus of the type in which a motor-compressor unit is resiliently mounted in a sealed casing. A resilient refrigerant discharge tube extends from the compressor to an outlet port in the casing. The discharge tube is made resilient to prevent noise and vibrations from being transmitted outwardly to the casing. The discharge tube has at least two convolutions in intersecting planes which are preferably at right angles to each other and are generally vertically disposed to form angles of less than 45 degrees relative to the vertical motor axis. The convolutions are preferably rectangularly shaped.

Abstract: The invention relates to a refrigeration type motor compressor assembly in which an integrated motor compressor unit is resiliently mounted in a sealed casing. A skeleton-like frame facilitates integrating the motor and compressor with a minimum amount of structural material. This frame includes a shaft bearing member and a cylinder member for the compressor function, these two members being joined by a beam member which is attached to the bearing member and extends to the cylinder member. The beam member has support posts depending therefrom which rest on the upper surface of the stator laminations.

Abstract: The invention relates to an integrated thermostatic control system for cooling and heating. The control system includes cooling and heating valves and fluid pressure controlled operating elements for the valves. The system has a common sensor and a common variable chamber temperature setting unit. A capillary tube system connects the operating elements to the sensor and the temperature setting unit. An adjustable spring associated with either of the operating units biases the associated valve in the closing direction to provide an operationally dormant dead zone.

Abstract: The invention relates to an ultrasonic measurement circuit of the type having an ultrasonic converter connected by a line to a transmission pulse generator. The circuit may have two transducers which operate alternately as a transmitter and a receiver and, in this case, the circuit also has a receiver amplifier. A resistor for preventing reflections is provided in the line between the pulse generator and the ultrasonic transducer which resistor is adapted to the wave resistance of the line. The pulse generator is shunted by a branch line having a switching device which becomes conductive at the end of the transmission impulse.

Abstract: The invention relates to an expansible chamber rotary piston engine of the type having meshing internal and external gears wherein one rotatable gear, which may be an internal gear or an external gear, has rotatable and oribtal movement relative to the other gear which is fixed relative to the housing. The engine has relatively rotatable and cooperable valve members connected respectively to the gears. The cooperable surfaces between the valve members may be either flat or cylindrically shaped. The valve members have respective first and second sets of circumferentially arranged ports with each port in one set moving sequentially into alignment with each port in the other set during relative rotation of the valve members. The ports are generally rectangularly shaped to provide maximum flow capacity between the valve members.

Abstract: The invention relates to a thermostatic valve assembly for refrigeration systems. The valve assembly is between the condenser and the evaporator and includes two valve units in series. The two valve units are shown integrated in one casing but could be provided with individual casings. The second valve unit has the conventional thermostatic function while the first valve unit functions to isolate the second valve unit from the effects of varying condenser pressures which go from high in the winter to low in the summer. In a pressure chamber between the two valve units a mean pressure is maintained which is between the condenser and evaporator pressures. The first valve unit is controlled by a balancing between opening forces created by evaporator pressure and a differential spring and a closing force created by the mean pressure in the mean pressure chamber.

Abstract: The invention relates to a refrigeration type motor compressor assembly in which an integrated motor compressor unit is resiliently mounted. The motor stator includes a stack of rectangularly shaped laminations with bevelled corners. Stator bolts extend upwardly through the laminations with the bolt heads projecting downwardly from the lower surface of the laminations. The resilient suspension system includes four generally cone shaped spring retaining abutment members attachable from below to the four corners of the stack of laminations. These abutment members have recesses for receiving the bolt heads and collars which extend outwardly beyond the bevelled corners of the stack of laminations. The collars are abuttingly engageable with the inner surface of the casing during lateral movement of the spring mounted motor compressor unit to provide bumper protection for this unit.

Abstract: The invention relates to a backstop ring for a stuffing box or the like which is cooperable with a carbon sealing ring. The main parts of a stuffing box are normally the stationary backstop ring and the carbon slide ring which rotates with the shaft. These two rings have mutually engaging sealing surfaces. The sealing surface of the stationary backstop ring is ground in a manner to form scratches which are orientated to create a radially outward pumping effect. The flatness of the ground surface has an overall variation of less than six microns and preferably is between 2 and 5 microns. The scratches have a roughness between 0.2 and 2 microns. For scratches on the order of 1 to 2 microns the surface is phosphatized.

Abstract: The invention relates to a protective circuit for an inverter having semiconductor control elements. The protective circuit includes a series regulator in its inlet branch and an intermediate filter circuit with the capacitor thereof extending between the inlet and outlet branches. First and second signal generators control the series regulator and the inverter. A control unit controls the first signal generator for normal operation. Parallel comparator units have monitoring inputs connected to different parts of the protective circuit for detecting abnormal conditions and outputs connected to both of the signal generators to effect the immediate turning off of the series regulator and the inverter when abnormal conditions are sensed. The inverter is off concurrently with the comparator output signal but a multivibrator switch having a predetermined period causes the series regulator to be off during that whole period independently of the comparator output signal.

Abstract: An electric storage heater assembly which includes a core and a resistance heater for the core. A charging switch is in series with the resistance heater and an electric comparator for operating the switch has two inputs connected to first and second controls which are responsive to the instantaneous temperature of the core and the final temperature of the core for the preceding charging period. The first comparator input is also connected to auxiliary controls which sense indoor and outdoor temperatures and provide signals which are summed with the signal which represents the core temperature.

Abstract: The invention relates to a control circuit for a self-starting electric motor of the type having stator windings in respective series relation with gate type electronic switches which are controlled by control impulses generated in a gate circuit. A motor starting pulse generator is connected to the gate circuit which generates short starting pulses and long blocking pulses. Motor operating controls responsive to commutation impulses are connected to the gate circuit which override the effects of the motor starting pulse generator during normal operation. An integrator for the commutation pulses generates a voltage level signal which corresponds to the speed of the motor. A comparator compares this signal with a reference voltage and, when the signal reaches a predetermined level, the motor starting generator is overriden. When the motor is stopped for any reason the short starting pulses attempt to start the motor at intervals determined by the length of the blocking signals.

Abstract: The present invention relates to a compressor refrigeration plant comprising a throttling device between the condenser and evaporator and, associated with the throttling device, an intermittently operable electric heating resistor, a chamber being disposed upstream of at least a part of the throttling device and the electric heating resistor being a PTC resistor which is arranged in the chamber and which, when a temperature range between the evaporating temperature of the refrigerant associated with the pressure in the chamber and the coking temperature of the refrigerant oil is exceeded, goes over from a low to a high resistance.