Abstract: A well type open top refrigerated display case has a primary air conduit extending around the cabinet and main fans for circulating air through the primary conduit and across the open top of the cabinet in the form of an air curtain. A column extends upwardly from and above the well type region; defrost fans are located in a defrost conduit in the column. Defrost control means are provided for energizing the defrost fans at the start of a defrost cycle to draw ambient air from above the refrigerated display case into the upper portion of the defrost conduit at a higher pressure than the air pressure in the region of the open top; a portion of the higher pressure ambient air is directed out of the defrost conduit to collide with the air curtain flowing across the open top, the flow of the air curtain being thereby reversed and caused to flow over the top of and outside the display case.

Abstract: A temperature-detection type change-over valve for switching the state of communication between a plurality of passages, suitable for use in combination with a controller for controlling the operation of an internal combustion engine. The valve has a thermally expandable member adapted to expand when heated, a shaft adapted to be pressed and moved in one direction as the thermally expandable member expands, a valve movable following the movement of the shaft between a first and a second position for switching the state of communication of passages, and a tension spring disposed to surround the shaft and adapted to exert a biasing force to act against the force generated by the expansion of the thermally expandable member.

Abstract: An air conditioning system including an air flow limiter and indicator comprising, in combination: a chamber (24) extending from an inlet (21) to an outlet (22) for flow therebetween of conditioned air at greater than ambient pressure; a damper (63) in the chamber actuable to variably restrict the flow; apparatus outside the chamber, including an inflatable member (66) having inlet (70) and venting (42) openings, for actuating the damper in accordance with the state of inflation of the member; condition-responsive apparatus, including a fluid amplifier (72) supplying fluid from the chamber to the inlet opening, for causing inflation and deflation of the inflatable member; apparatus including a vane (32) in the conduit for responding to the rate of flow of the fluid in the conduit; apparatus (41, 57) normally closing the venting opening; and apparatus (43, 45, 55) operable by the vane as the rate of flow exceeds a predetermined value for unclosing the venting opening, to enable deflation of the inflatable mean

Abstract: The invention provides an improved process for preparing gasified ice products; particularly, a process is provided which more efficiently produces gasified ice products having improved mechanical strength and high gas contents without spontaneous popping.According to the present invention, transfer of a suspension of gas hydrate from a batch reactor is improved while at the same time the final product quality and the rate of freezing the suspension are improved. It has been found that gently agitating the suspension, while still under contact pressure, enables complete transfer of an essentially gas bubble free suspension to the freezing vessel.

Abstract: A device for transmitting drive force to an ice-making tray of an ice making machine includes a slider interposed between a drive motor gear and a gear directly connected to the ice-making tray, and a cam gear meshing with the drive motor gear. The slider is formed with a gear portion meshing with the gear directly connected to the ice-making tray for rotating same both clockwise and counterclockwise, and a guide groove receiving therein an actuating pin formed in the cam gear for moving the slider in pivotal movement in a predetermined range of angles.

Abstract: System for making frozen food article comprises a refrigeration source of high capacity, a food-freezing chamber normally maintained at ambient temperature and of low thermal capacity, a source of food or vegetable juice or puree for freezing, and a controller. The controller controls the refrigeration source to maintain an adequate supply of chilled coolant, controls the discharge of the coolant liquid to a coolant jacket around the frozen food chamber for rapid chilling, controls the discharge of food material to the chamber, controls the beating of the food material while it is freezing, and finally controls the discharge of the resultant beaten frozen food article into a receiving cup.

Abstract: A refrigerant compressor which automatically adjusts the suction amount of the refrigerant gas according to the variation of the operative conditions of the refrigerating system. The compressor is provided with a detector (sensor) such as bellows, bimetals, etc., which are variable in form according to the variation of pressure or temperature of the refrigerant gas caused by the variation of operative conditions of the refrigerating system, and with a device which is actuated by the deformation or form-variation of the detector for varying the flow passage area of the refrigerant gas at the suction port of the refrigerant gas to the compressing chamber of the compressor.

Abstract: A pneumatic control circuit for controlling the discharge of conditioned air from an air distribution system. The circuit is arranged to apply the supply pressure to an inflatable bladder which controls the discharge of conditioned air from a ventilation duct. A diaphragm controls the bleeding of air from the bladder under the influence of the supply pressure, a thermostat, a velocity sensor at the duct outlet and a plurality of selectively sized orifices. The velocity sensor compensates automatically for variations in the main supply pressure so that the control function of the circuit is independent of the supply pressure.

Abstract: Air mixing apparatus that is particularly useful in connection with a winter make-up air and a summer ventilation system for a factory, warehouse or the like includes inner and outer relatively movable ducts, the former having side walls, an air inlet through which outside air can be drawn into the outer duct and an air outlet through which air can exit from the outer duct. At least one first port is provided in the side walls of the outer duct for passage of inside air, i.e, air from inside the building, into the outer duct. The inner duct has at least one second port in its side walls through which air can pass into the inner duct, and the inner duct also has an air outlet for passage of air into the outer duct where it can exit from the air outlet of the outer duct. Baffles extend between the inner and outer ducts on either side of the at least one first port and with the inner and outer ducts define a header. A motor or the like can move the ducts relative to each other between two positions.

Abstract: This invention pertains to machines for freezing and dispensing a confectionery product, particularly soft ice cream and milk shakes. The invention is particularly addressed to an improved mix over-run control for controlling the flow of air and liquid product into the freezing chamber by directing the incoming fluid mix from a reservoir into a vortex chamber which causes the fluid mix to flow down the side walls of a communicating line with an open air passage in the center therefor for assuring the proper over-run or percentage of air in the resultant confectionery product.

Abstract: An electric refrigerator with an automatic ice-making unit which comprises in combination a cooling unit including a compressor, a condenser and an evaporator with a refrigerating chamber and an auger type automatic ice-making unit with an ice-storing chamber.

Abstract: The present invention provides an air-handling unit that can supply air, to a desired space, which is cold, which is cooler than the set point of the thermostat for that space and hence is referred to as cool air, which is warmer than that set point and hence is referred to as warm air, or which is hot. That unit can operate even when very low pressure air is supplied to it; and hence it is connectable to a conventional low pressure cold air duct. That unit may have a heat source incorporated into it, may utilize air from that space which is cooler than that set point and hence can be referred as cool air, and may utilize air from the space which is warmer than that set point and hence can be referred to as warm air. Dampers in that unit control the amount of cold air and cold air that is supplied to that space, and a blower and the heat source in that unit control the amount of warm air and hot air which is supplied to that space.

Abstract: The invention makes use of a second thermostat in an engine cooling system, normally equipped with only a single thermostat. The second thermostat differs from the single thermostat in that provision is made for a constant, though materially diminished, flow of coolant past the second thermostat which, when the need arises, is converted to full flow by action of the second thermostat.

Abstract: A steam trap includes a housing having an inner chamber, a feed opening and a discharge opening disposed adjacent to one another and communicating with the inner chamber, and a control unit disposed in the chamber including at least one bimetallic plate, a locking member disposed at the low pressure end of the trap and secured to a valve spindle extending centrally through the bimetallic plate and having a cam mounted thereon for engagement with the bimetallic plate and a seat sleeve which defines a valve seat and an abutment for cooperative engagement with said locking member and bimetallic plate, respectively. The seat sleeve includes a feed bushing which, in cooperation with the valve spindle, defines a flow channel therebetween and the cam consists of a cap disposed over a free end of the feed bushing projecting above the bimetallic plate, on the latter of which the cap is supported.

Abstract: A thermostat for a pneumatic control system controls output pressures to a plurality of elements to be controlled. The thermostat can control output pressure directly or inversely and linearly or nonlinearly with respect to temperature. Additionally, the pressures can be controlled sequentially or simultaneously.

Abstract: An improved frozen dessert maker of the type having a motor with an output shaft mounted within a base, a can for containing dessert mix to be frozen, a dasher mounted within the can, and a top for sealing the can and supporting the dasher includes a plurality of coolant packs containing a coolant positioned concentrically about the can and secured to the can by means of a strap having a draw pull catch and strike, and a drive train wherein a second shaft parallel to the output shaft orbits about the output shaft. A lower stud which extends upwardly from the base acts as a bearing surface for an upper stud which extends downwardly from a platform supporting the can and coolant packs so that rotation of the output shaft of the motor causes the upper stud to move reciprocally against the lower stud causing the can and packs to move in a somewhat circular path about the axis of the second shaft with a reciprocating rotational motion superimposed on the circular path.

Abstract: An air conditioner of an automatic temperature adjusting type used particularly for controlling the air temperature within a passenger compartment of an automotive vehicle. According to the present invention, the air conditioner controls simultaneously the air flow rate of a fan providing the air supply, and an air mixing door which controls the flow of air through either a heater or a bypass around the heater. The control is such that over an intermediate portion of the adjustment range the fan and air mixing door are operated together whereas at end portions of the adjustment range the fan is adjusted without moving the air mixing door. This is achieved by use of a particularly convenient gear mechanism of novel design.

Abstract: A thermostatic expansion valve for use in a refrigeration system (e.g., a refrigerated display case) in which the superheat range of the valve may be conveniently adjusted from a location remote from the valve.

Abstract: Heat is recovered in a medium at higher than normal condensing temperature of a refrigeration system by using two cascade connected refrigeration systems and heating the medium in isolated stages by refrigerant subcooling and refrigerant condensing stages of the higher temperature system.

Abstract: A diffuser for a conditioned air system for buildings incorporates a self contained and integrated sensor actuator for varying the volume flow of conditioned air through the diffuser in response to changes in room air temperature.The sensor actuator structure for sensing the room air temperature and for modulating the conditioned air flow is entirely contained within the diffuser structure and is powered directly by the changes in room air temperature without auxiliary equipment or power systems.The self contained diffuser is fully adaptable to existing systems to provide either or both modulated cooling and modulated heating and also to supply modulated cooling with the capability of morning warm-up.The diffuser is constructed to direct the air flow from the periphery of the diffuser and into the room at an angle and with a velocity which causes the air flow to have preferred aerodynamic characteristics so as to hug the ceiling and to avoid dumping.