Abstract: The invention relates to a system that can provide the refrigeration function of a compression refrigeration system, or by changing the position of some valves in the system, the system can provide a defrost function, or a heating function, or a capacity controlled refrigeration function. To accomplish the defrost or heating function compressed refrigerant is condensed in a heat exchanger that is in heat exchange relationship with a main evaporator and the liquid refrigerant thus formed passes through an expansion valve to an auxiliary evaporator. When the system operates to provide a capacity controlled refrigeration function, the capacity of the main evaporator is controlled by heat of compression from the heat exchanger that is in heat exchange relationship with the main evaporator. The amount of heat from this heat exchanger that counteracts the cooling effect of the main evaporator can be varied by dissipating a variable amount of the heat of compression before it reaches this heat exchanger.

Abstract: This invention relates to a compression refrigeration system having means for removing some of the oil refrigerant foam which is formed in a crankcase at startup. The removal of foam with entrained oil from the crankcase is to reduce the amount of oil pumped with the refrigerant through condenser and evaporator and at the same time rapidly return oil to the crankcase during startup. In one embodiment of the invention, oil refrigerant foam goes from the crankcase to a foam trap where the foam collapses, the oil drains back to the crankcase, and the refrigerant vapor is drawn to an intake of the compressor. In another embodiment, oil refrigerant foam passes to a suction accumulator where the foam collapses, refrigerant vapor is drawn to an intake of the compressor and the vapor carries droplets of separated oil to a point where they drain back to the crankcase.

Abstract: The invention relates to the air conditioning of a storage compartment and is especially significant for a transport system. Air is circulated between an air tempering zone and the storage compartment, said air tempering zone having air cooling means and air heating means controlled by a thermostat. The thermostat has a wide range set point and depending upon what set point is selected, the thermostat is responsive either to the temperature of the air discharged from the tempering zone or the temperature of the air returning to said zone. When the set point is above a given point and the air is being cooled to near the desired temperature, said desired temperature is accurately obtained by the thermostat first sending a signal from a selected one of the two sensors that provides a step-reduction in the capacity of the cooling means and then sending a signal to a modulating valve that further reduces to the set point the capacity of the cooling means by a modulation reduction.

Abstract: Apparatus for transmitting and receiving a plurality of separate pictures or scenes on a single television carrier signal such that a different picture appears in each quadrant of a television receiving tube, and including means for blanking out all but one quadrant and for centering and expanding that quadrant to fill the entire screen of the receiving tube. This is accomplished by separating the sync signals from the video, followed by delaying the sync signals and recombining them with the video such that the video portion, representing one quadrant, is essentially centered between horizontal and vertical sync pulses. Expansion of the single quadrant after it is centered on the tube is achieved by increasing the amplitude of the vertical and horizontal sweep waveforms.