Abstract: A device and method for safely removing occupants of multi-story buildings under conditions of fire and catastrophe by allowing one occupant at a time to don a harness attached to the device and safely jump, with his rate of descent controlled so that he reaches the ground safely. The device has a rigid frame in which a rotatable shaft is positioned. On the shaft are mounted two drums. On each drum is wound enough cable to reach the ground from the height of installation of the device. Each drum has its cable wound in a direction of rotation opposite from that of its mate. A drag element acts on the shaft to limit the rotational velocity of the shaft, and thereby the rate of fall of the escaping occupant, to a speed which will not injure the occupant on contacting the earth. Only one user at a time will be able to occupy the apparatus since the cable end of the second cable is hidden under the first cable and is not accessible until the first cable has been completely unwound.

Abstract: A drain assembly including a drain pipe and a heater oriented to heat the drain pipe, in combination with a defrosting type refrigeration evaporator intended for use within an enclosure whose temperature is maintained lower than the freezing point of water. The drain pipe has a discontinuity positioned in an upper portion so that defrost meltage traversing the drain tube in the ordinary course will not leak out of the pipe through the discontinuity, but that meltage backing up in the drain pipe because the drain pipe has been plugged by ice or dirt, will flow out of the discontinuity onto the freezer floor rather than backing up further into the drain pan, and the discontinuity will be maintained free of ice because it is heat transfer relation to the heater.

Abstract: An air cooling evaporator for use in refrigeration systems under conditions where frost is deposited on the cooling surfaces having a drain pan positioned under the cooling surface and a water distributing pan positioned over the cooling surface. The water distributing pan has as a distribution device holes positioned in the bottom of the pan, with the holes so positioned or sized that more water is distributed to the portions of the coil.

Abstract: An air supply and return system for heating and cooling a room, including an air flow loop having a first set of openings positioned high in a wall of the room (high vents) and a second set of openings positioned low in a wall of the room (low vents). The air flow loop includes a reversible air moving device, heating and cooling coils, and ducts connecting the reversible air moving device, filters, and the heating and cooling coils to the high vents and the low vents. During the cooling cycle, air is withdrawn from the room through the low vents, circulated with high air flow by the air mover through the ducts, filter, and the cooling coils, and discharged to the room from the high vents. During the heating cycle the air mover, and thereby the direction of air flow within the duct system, is reversed.

Abstract: A scoring form for tests having a series of questions with multi-choice answers.The form provides an answer group for each question. An answer group is a matrix of rows and columns. The number of columns (or matrix elements in a row) is typically equal to the number of answer choices in the questions, with the elements in each row identified the same as the answer choices. The number of rows in the matrix is equal to the position number of the question in the ordered series of test questions. Each line in the matrix is identified by the question number and one of a series of hyphenated identifiers.Each element in each matrix contains a latent image address which is invisible to the testee until he activates the latent image, as by rubbing the spot which he associates with the correct answer.

Abstract: A portable extendable inclined boiler having an open and a closed end, for steaming and thereby softening wooden members for later bending including: a low water cutoff utilizing a thermostat mounted on the boiler wall near the heater; a low water cutoff actuated by the reduction in weight of boiler heater to a predetermined minimum; a steam control thermostat mounted at the open end of the boiler which temporarily turns off the heater when excess steam is being produced; and an integral boiler water measure utilizing a weep hole in the wall of the boiler for providing an indication of the correct boiler water charge to the operator.

Abstract: A distributor for volatile refrigerant having a single inlet and many outlets and designed to distribute refrigerant substantially uniformly to each outlet, has its outlets manifolded together in groups to provide equal refrigerant distribution to a few relatively large loads or unequal distribution to a few relatively large loads according to a predetermined ratio, the ratio of the refrigerant distribution to the various loads being predetermined by the ratios of the numbers of outlets that are selected to serve those loads.

Abstract: A cooling unit for refrigeration systems having a substantially vertically disposed air cooling element, utilizing either a volatile or a non-volatile refrigerant, upon which element frost accumulates during the course of the refrigeration process. The element includes heaters to periodically warm the element to a temperature above 32.degree. F. to thaw the frost. These heaters have their heating capacity adjusted so that more heat is applied at the bottom portion of the frost-collecting air cooling element and less heat is supplied to the upper portion.

Abstract: A refrigeration system for cooling air having an evaporator; a compressor; a control for establishing ON periods and OFF periods of the compressor; at least two motor-driven fans positioned to force air over the evaporator; and a control system for the evaporator fans to cause fewer of the fans to run during compressor OFF periods and more of the fans to run during compressor ON periods.

Abstract: A compression type refrigeration system including at least one frosting evaporator positioned to refrigerate air. The evaporator has a liquid refrigerant inlet to which is connected an expansion valve. The evaporator also has a hot gas inlet; a liquid line supplies liquid to the expansion valve; a branch in the liquid line controlled by a solenoid valve connects to the hot gas inlet. The condensing unit, which includes compressor, condenser, receiver and re-evaporator, are valve-controlled so that during refrigeration, discharge gas from the compressor flows through the condenser, receiver, liquid line and expansion valve seriatim, but during defrost, gas from the compressor bypasses the condenser and flows instead from the compressor through the receiver, liquid line and hot gas inlet of the evaporator seriatim.

Abstract: A refrigeration system having compressor and condenser adapted for operation in ambients above approximately 45.degree. F (7.degree. C) and including a frosting evaporator. The evaporator is defrosted by hot gas which flows through the compressor discharge, the condenser, the receiver, the liquid line and a valve-controlled hot gas branch connected between the liquid line and the hot gas inlet of the evaporator. During defrost, a control stops the evaporator and condenser fan motor and opens the valve in the hot gas branch conduit. At defrost's end, the control causes the evaporator and condenser fan motor to operate and the hot gas valve to close so that liquid refrigerant flows from the condenser outlet through the receiver and liquid line to the expansion device which feeds the evaporator for refrigeration in the normal course.

Abstract: A compression type refrigeration system including at least one frosting evaporator positioned to refrigerate air. The evaporator has a liquid refrigerant inlet to which is connected an expansion valve. The evaporator also has a hot gas inlet; a liquid line supplies liquid to the expansion valve; a branch in the liquid line controlled by a solenoid valve connects to the hot gas inlet. The condensing unit, which includes compressor, condenser, receiver and re-evaporator, are valve-controlled so that during refrigeration, discharge gas from the compressor flows through the condenser, receiver, liquid line and expansion valve seriatim, but during defrost, gas from the compressor bypasses the condenser and flows instead from the compressor through the receiver, liquid line and hot gas inlet of the evaporator seriatim.

Abstract: A suction accumulator for refrigeration systems having a tank with an inlet fitting for conveying it to refrigerant vapor from the evaporator which is mixed with oil and at times with liquid refrigerant. The tank has an outlet fitting for conveying away the refrigerant vapor from which the oil and liquid refrigerant have been separated. An oil return conduit is located underneath the tank. One end of the oil return conduit is connected into the bottom of the tank; the other end to the outlet fitting of the accumulator. Located within this oil return conduit is a thermostatic expansion valve whose bulb is located on the oil return conduit between the tank and the expansion valve. This bulb senses low superheat when liquid refrigerant is in the tank and in the conduit, and causes the expansion valve to close when liquid refrigerant is present, preventing the flow of large amounts of the liquid refrigerant into the outlet conduit.

Abstract: A refrigerant flooding type capacity control for air cooled condensers used in compression type mechanical refrigeration systems where the liquid receiver is located in a bypass around the condenser so that the controlled heating, which is applied to the liquid refrigerant in the receiver to create the flooding effect, does not cause a warming of the cold liquid refrigerant leaving the condenser.

Abstract: A pressure switch for use in refrigeration systems which includes a restrictor to minimize the effect of compressor pulsations on the pressure sensing element and a heater positioned to warm the interior of the switch housing and to maintain the fluidity of refrigeration oil traversing the restrictor under conditions when the switch is exposed to low ambient temperatures.

Abstract: A refrigeration evaporator with a drain pan which contains a heated temperature sensitive element for distinguishing between the abnormal condition of water or ice in the drain pan and the normal condition of cold air there. The distinguishing action of the element takes place because the heated element is warmer in the presence of air than in the presence of moisture. An alarm or signal, for alerting operating or service personnel, responds to the temperature of the sensor.

Abstract: A reversible compression type refrigeration system is commonly known as a heat pump for conditioning a space having a conditioning side and a service side. The conditioning side is that area or environment where it is intended to achieve the benefit of the alternate heating and cooling effects produced by the reversible system. The service side is that side from which heat is drawn or to which heat is rejected when the opposite effect is required on the conditioned side.

Abstract: A refrigeration system which has two condensers located in different environments and intended for use alternately, a valve arrangement for determining which of the two condensers is to be operative for rejecting heat and which is to be inoperative, which includes control valves in the outlet conduit of each of the condensers arranged so that when one is open, the other is closed, and vice versa.

Abstract: A defrost control system for the defrosting evaporators of a refrigeration system which utilizes a first timer which runs continuously and attempts to initiate evaporator defrost at predetermined times and a second timer which accumulates compressor operating time and prevents defrost initiation by the first timer at those preselected times until a predetermined period of operation of the refrigerating system has occurred.

Abstract: This patent describes forced air heat exchangers using single phase A. C. motors to drive their fans and a method of securing high and low speed operation of the motors by connecting them alternately in delta and wye across a 3-phase power supply.