Abstract: A vehicle door structure having an exterior surface of a glass window located in a vehicle door. A door window is vertically displaceable in conjunction with a slider. The slider has a vertically extending groove into which an end portion of the door window is fitted. An adhesive is provided between the end portion of the door window and the inside of the slider to fix the door window in the groove of the slider. The upper portion of the slider closes the space in which the adhesive is filled so that the adhesive does not spread out on the upper surface of the slider, thereby preventing accumulation of foreign matter such as dust and dirt, and adding to the aesthetic appearance of the assembly.

Abstract: To maintain a premanufactured sliding sash window assembly square and distortion-free during shipment and until completely installed in a building, the two vertical sides of the window frame are connected by a tension element which prevents outward bowing of the two frame sides. Protective clips are installed on the top and bottom rails of the exterior sliding window sash near the corners of the sash and are secured to the sash by adjustable clip and sash encircling bands. The upper sash clips include posts which are releasably anchored to interior faces of the window frame. The upper and lower sash clips include vertical spacing fingers which engage between the vertical edges of the exterior sash and opposing vertical faces of the window frame to provide proper spacing of the exterior sash relative to the vertical sides of the frame.

Abstract: An infiltration control device comprises an elongated fabric strip with opposite side margins overlapping at a lap seam to form an elongated tube. The tube is filled with an insulative material. A fastener is provided for releasably securing the tube on the operable element of a door, window or the like.

Abstract: A clamping device is mounted to the machine bed of a grinding machine and is longitudinally slideable along said machine bed. Adjacent to the machine bed a rotatably driven grinding wheel is arranged such that by means of several actuators relative movements are possible between workpiece and tool in an X-Y-Z coordinate system related to the workpiece, while the grinding wheel is slideable parallel to its rotational axis which is adjusted according to the pivoting angle. To achieve a smooth transition without a ridge between the shaft portion and the hemispherical portion of the workpiece, the grinding wheel is moved, without interrupting its path curve such that the rotational axis describes roughly the arc of a circle about the hemispheric end. Simultaneously the grinding wheel performs a translatory movement parallel to its rotational axis such that the cutting edge in the hemispherical portion runs at a positive rake in the direction of the longitudinal axis of the workpiece.

Abstract: Valve seat grinding apparatus having a rotatable drive wheel of disk shape, a plurality of independently rotatable satellite wheels carried about the drive wheel with the respective radial planes of satellite wheels being disposed at a selected included angle with respect to the axis of drive wheel and disposed at a selected radial distance away from the axis of drive wheel. A plurality of slide blocks intermediately connect the drive wheel with satellite wheels. The selected included angle is selected in a range including 90 degrees. The drive wheel is provided of a shape, material and thickness to resist any deflection which would change selected included angle by forces within the range of operational forces applied through the drive wheel to satellite wheels.

Abstract: A jig for transferring a partially faceted gemstone from a first dopstick to a second dopstick, without altering the spatial relativity to the faceting device so that the unfinished gemstone can be faceted. The jig comprises two grooved blocks, and associated clamps. One block is located at each end of a base portion, with a swivelable pawl mounted in a slot at each end of the base portion. A first dopstick with a partially faceted gemstone cemented to one end, and a calibrated, notched indexing gear fastened to the other end, is removed from the faceting device, placed in one of the blocks, with the gear end adjacent to a pawl. The pawl is swiveled into contact with the gear; the dopstick is rotated until the pawl engages a gear knotch; the engaged knotch is noted, and the dopstick is secured to the block with its associated clamp. A second dopstick is placed in the other block, moved into contact with the gemstone, cemented thereto, and firmly secured with its associated clamp.

Abstract: Conversion of a ventilated roof to a thermally insulated, nonventilated roof without tearing off an existing roof sheathing which is, for example, made of asbestos cement and is carried by roof beams, includes the provision of holes in the old roof sheathing over the length of each roof beam at approximately equal intervals; and the provision of posts which are secured on the roof beams, extend through the holes, and project above the old roof sheathing. A heat-insulating intermediate structure is secured on the posts, has a U-shaped or hat-shaped profile, and extends over the posts which are arranged in a row, on which U-shaped or hat-shaped profile is secured the new roof sheathing. The space between the old and new roof sheathings is filled with an insulating layer.

Abstract: In the electronic equipment shelter disclosed herein, protection of electronic equipment from both normal and abnormal environmental conditions, including severe electromagnetic pulses, is provided by employing a construction in which panels having inner and outer aluminum skins are joined together in an assembly employing extruded box tubes at each edge with the outer skins being welded to each other and to the tubes so that a complete conductive envelope is obtained. The necessary door opening is made electromagnetically unitary with the main shelter body by metal spring finger gaskets which are compressed by means of a multiplicity of linked dogging assemblies all around the door frame.

Abstract: A portable deck system comprising a fixed deck surface adapted for structural support through side panel secured thereto and expandable for adaptation to a plurality of sizes. The fixed deck portion is constructed of a wooden frame and deck members adapted for securement to a plurality of other platform sections for expansion in orthogonal directions to form a deck of unlimited size and shape. The side rail frames are constructed for securement to said platform along the edges thereof in structural truss interengagement therewith for providing requisite rigidity for a multiplicity of uses. The side rail sections and steps are constructed for coupling to said platform along interchangeable end portions thereof to facilitate adaptation of the deck to motor homes and the like facilitating selection of direction of entry or assembly.

Abstract: The invention relates to an apparatus for the construction of monolithic of multi-level or pillar-framed buildings having suspended ceilings, said apparatus is provided with surface- and in given case working level-forming formwork shell surrounding the monolithic concrete form-space of the ceiling, formwork bearer supporting the formwork shell, furthermore actuating mechanisms, e.g. lifting units for lifting and lowering the formwork bearer, the actuating mechanism, e.g. lifting units are in force-transmitting connection directly or indirectly with a certain part, e.g. pillars of the temporary or permanent vertical load bearing structures of the building, load bearing elements, e.g. bear frame, connecting member, etc. are built in between the formwork bearer and the lifting units.

Abstract: A multiple pane glass assembly having at least one pane that is electrically heatable. The glass panes of the assembly are disposed in closely spaced, side-by-side relation with a spacer interposed between adjacent panes. The spacers include a plurality of hollow tubular members disposed near the peripheral edges of the panes with adjacent ends of the tubular members connected by corner key elements. Electrical lead wires extending from an interior electrically heatable surface of one of the panes are directed through respective apertures or passageways in the corner key elements, into the end of a respective tubular member connected to the corner key element, and through the tubular spacer members to a common egress location. The corner key elements are adapted to retain desiccant material in at least some of the tubular members, which together with sealant applied about the periphery of the assembly, enables an air-tight sustantially vapor-free condition to be maintained in the space between panes.

Abstract: A straight drain tube for use with window assemblies includes a linear conduit having an inlet end for receiving moisture build-up and a outlet for dispensing the moisture to the outside of the window structure. The drain tube also includes closure means for sealing the conduit's outlet end, which is seated in an integrally molded closure face unitary with the conduit.

Abstract: A method for producing a constructional element comprising a steel casing filled with concrete, for instance, a machine body having good load carrying and vibration-absorbing properties. The main steel parts of the element are arranged to form a hollow casing filled with a fluid concrete mass. Internal pressure is supplied in the casing to act on the concrete mass during its hardening phase, the pressure being selected so as to provide in the steel casing an elastic deformation and expansion which substantially exceeds the shrinkage of the concrete mass during its hardening phase. The internal pressure must be sufficient to cause such a deformation of the steel casing that there is a remaining compression between the steel casing against the dry shrunk concrete in the finished element under all the loading and deforming conditions for which the constructional element has been designed.

Abstract: An assembly for sealing the space between adjacent architectural panel assemblies, such as window panels, includes a sealing means configured to fit between the opposing end surfaces of adjacent window panels, compressible members for engaging the sealing member and the opposing surface of each window panel, and a rigid member configured to fit in an interior cavity of the sealing member. The rigid member maintains the means in alignment with the opposing edge surfaces of the adjacent panels.

Abstract: A modular panel of glass fiber reinforced concrete having a thickness of at least 3/8 inch, and containing four (4) to six (6) percent glass fiber and at least fifty (50) percent by weight cement, has upstanding edges forming flanges oriented normal to the plane of the panel and a thickness equal to the thickness of the panel, which flanges on contiguous panels can be joined to form a composite wall structure by bolting said flanges together. The novel panel and flange arrangement allows self-supporting wall structures to be constructed wherein only lateral loading (normal to the plane of the wall) need be carried by the adjacent framework. An elastomer gasket is used between the flanges to accommodate expansion and contraction of the individual panels in a composite wall of the panels.The invention includes composite walls of a plurality of the panels and a building structure employing such composite walls, with an adjacent framework and the interconnective arrangements between these several components.

Abstract: A roofing structure includes a plurality of beams supporting an inner skin of cladding material. The inner skin of cladding material is secured to the beams by U-shaped brackets. An inverted U-shaped rail nested with pairs of brackets is clamped to the brackets by means of a nut and bolt to define a box-like support structure.An outer skin of cladding material is secured to the rails. Each bracket is provided with locating holes which can be engaged by a bolt and on which the rail can be nested to effect alignment between the fastening slots respectively in the bracket and the rail just prior to clamping.

Abstract: The present tile is adapted to cooperate with similar tiles to form a tiled surface, and is formed from a relatively thin sheet having a periphery disposed symmetrically about a central axis. When the tile is installed the central axis coincides with a line defining free water flow down the tile between upper and lower tile portions. The tile has first and second raised ribs extending symmetrically as mirror images of each other on each side of the central axis. Each rib has upper and lower rib portions which are interconnected so as to extend continuously between the upper and lower tile portions to increase stiffness of the tile. The stiffened tile is better able to resist weight of a person walking on the roof, and also resists a tendency for the lower portion of the tile to lift when wind blows onto the roof. The upper rib portions are smaller than, and complementary to, the lower rib portions so that the lower rib portions of an upper tile can fit over upper rib portions of a lower tile.

Abstract: A thin plate structure such as a deck structure for, for instance, a footbridge comprises at least two abutting and substantially horizontally arranged profiled girders. Each girder comprises at least two substantially vertical plate-shaped side members. The girders are interconnected two by two by means of a plurality of connection fittings in these side members. These connection fittings are formed by locking lifting and comprising at least one downwardly pointing locking tongue cut out in one of the side members of each girder. Along a preferably horizontally extending bent bending area the locking tongue is bent in an offset manner outwards. The locking tongue co-operates with a locking tongue opening punched out opposite the locking tongue in the abutting side member of the adjacent girder as well as with at least one upwardly pointing locking gill punched out of one of the side members in each girder.

Abstract: A metal framing system for building structures wherein the members have continuously roll formed and fabricated "C"-shaped, "T"-shaped, and "I"-shaped cross sections and wherein the flanges at their distal edges excluding plate members, include a roll formed multi-purpose end and surface fastener recess extending the length of the member. These recesses are adapted to supportedly receive threaded fasteners for use in conjunction with both interconnection of pre-punched transverse plates at the ends of the members and also for attachment of wall covering against the flanges of the members. This recess and extended distal edge, while providing full functional flange width, also eliminates "Q" column flange loss while substantially stiffening the distal edge of the flange. "C" section studs and joists members may have two additional end fastener recesses added to the webs where a total of four fasteners are required per member for attachment to plates.

Abstract: In a packaging machine in which bottles (P) or the like are drop-loaded into open topped article carriers (C), a device for interrupting the fall of bottles into a carrier. The device comprises a pivotal arm (32) which includes resiliently mounted support blocks (42, 44) adapted to displace a base panel (b) of a carrier upwardly at a drop-loading station of the machine and provide a temporary platform onto which the dead load of a bottle is transmitted during interruption of drop-loading while the base panel remains displaced. The pivotal arm is cam-actuated so that it pivots in one direction to cause the carton base panel displacement and thereafter in the opposite direction to allow completion of loading by withdrawal of the support blocks so that the dead load of the bottle is transferred from the support blocks to the carrier base.

Abstract: A monitoring and control system for a fluid container filler line having an empty container in-feed conveyor (11), a multivalve fill station (14), a multihead scanner station (17), a discharge conveyor (20) and a fill height detector (25), the system comprising a sensing module (22) having a first sensor (44) to indicate the first of a sequence of numbered valves with means to reset a valve counter, a second sensor (45) to count each valve of the sequence and controller means (50) responsive to said sensors to spacially track each container (12) through the system and to identify the particular fill valve for each particular container. A detector (54) is responsive to the controller and signals from the height detector to detect an improperly filled faulty container and identify the particular number valve which did the faulty filling.

Abstract: A method and apparatus for assembling and dispensing a multi-ply web and wrapping a load with the multi-ply web includes a film web dispenser for receiving a plurality of webs from a plurality of rolls of web material, juxtaposing the plurality of webs to form a multi-ply web and dispensing the multi-ply web. The load is rotated relative to the film web dispenser to wrap the multi-ply film on the load and tension is maintained on the multi-ply web between the film web dispenser and the load. A core material such as a web of foam, UV-resistant material, or reinforcement netting is inserted between the plurality of webs prior to dispensing the multi-ply web. Rollers and a clutch and brake assembly are used to intermittently forward the web of core material.

Abstract: The band movement drive of a machine for the automatic hooping of a package with a hooping band has a main band drive and a secondary band drive. During band advance, the hooping band is guided by the main band drive at a first, higher speed in a band channel for enveloping the package up to its entry in a joining station, followed by a switching over to band retraction, which takes place at the same higher speed. The secondary band drive is driven at a higher speed than the main band drive, so that a band reserve is formed beween the two band drives. When the hooping band is loosely applied to the package, switching over takes place to a second, lower speed, at which the band reserve is retracted. The hooping band is then tensioned with the tension set on the main band drive and then in the joining station the band and band end are joined together and the band is separated from the band supply.

Abstract: Disclosed herein is a method of tensioning a web packaging material in a form-fill-seal packaging apparatus wherein the web is pulled from a supply roll through web feeding rolls, guided over means for forming it into tubing and fed toward means for feeding the tubing forward, and wherein articles to be packaged are provided in the tubing and sealing operations are performed on the tubing to seal it to form packages. The invention method is characterized in that the web feeding rolls and the tubing feeding means are concurrently started, and when the web feeding rolls and the tubing feeding means are stopped to form a seal on the tubing, the tubing feeding means is stopped slightly later than the web feeding rolls so that the web forward by the web feeding rolls is taken up and pulled toward the tubing feeding means under tension.

Abstract: A lid-sealing machine has an infeed system that employs a timing screw arranged to convey flanged trays along the upper portion thereof. The carousel on which the trays are supported during sealing has a multiplicity of locations, each with an associated heat and pressure applying platen; operation is continuous and with no indexing of the table.

Abstract: A plastic container lid which has a small ridge protruding from the outer periphery of the lid, at the top corner of the lid. The ridge provides a uniform taper in the outside diameter of the lid, enabling containers to be capped at high speeds by a method that utilizes a spinning rod feed mechanism. The ridged lid is formed by a novel method, utilizing a one-piece mold cavity, fitted with a one piece mold insert. Also disclosed is a method of fabricating the one-piece mold cavity.

Abstract: An apparatus for placing a card on a bundle of sheet-like articles comprises a support for supporting the card adjacent the bundle, a feed device for feeding the card into the support, and a mechanism for placing a strap around the bundle, the card being stripped from the support by relative movement between the bundle with the card attached thereto and the support.

Abstract: A mechanism for enveloping a large round bale with a wrap material such as plastic sheet or net includes a housing for holding a supply roll of such material. The mechanism is mounted to the rear of a bale discharge gate. The housing is substantially enclosed except for an open front which is closed by a panel carried by the gate. The housing is vertically pivotally mounted for swinging away from the gate to a lowered position disposing its open front so that it faces rearwardly for reception of a supply roll of wrap material. A spring-loaded U-shaped structure is provided on the housing for biasing the material toward a lower front corner defined at the juncture of a plane containing a bottom wall of the housing and the panel.

Abstract: The rotary mowing attachment for a tractor or the like comprises a mowing drum mounting member, preferably a mounting bar, laterally mountable on a tractor or the like, four mowing drums attached to the underside of the mowing drum mounting member, and at least one cutting tool attached to each mowing drum, wherein the cutting diameters of the cutting tools on at least two mowing drums are different, the cutting diameters of all adjacent mowing drums overlap, and at least one of the mowing drums rotates in a direction of rotation opposite to that of the remaining mowing drums.

Abstract: Individual stalk shredder units are mounted beneath the frame between the wheels of a cotton harvester. The shredder units are connected to a shredder bar which is attached to the frame by support arms. The height of shredder bar in use is regulated by gauge wheels. The shredder bar is raised and lowered by a power lift mechanism.

Abstract: A defoliator for detopping sugar beets and the like includes at least one laterally extending rotor on which a plurality of flails are mounted. The flails are of polyurethane and have a hub at one end provided with a bore so that they can be pivotally attached to a rod supported on the rotor. Each group of flails includes tapered flails at the ends of the group and rectangularly configured flails therebetween with still an additional tapered flail between the two non-tapered flails. Each flail has a rigid cutting member at the free end thereof, each cutting member being channel-shaped so as to provide parallel flanges projecting in one direction with respect to an integral web having a hole therein so that the member can be bolted to the free end of the flail with which it is to be associated. Each cutting member has an additional flange extending in an opposite direction from the parallel flanges, the additional flange residing in a proximal relation with one side of the flail.

Abstract: The disclosed flexible flail is molded from polyurethane. The flail has a relatively thin shank with a hub at one end so that the flail can be attached to the rotor of conventional defoliating apparatus and has a thicker portion at the end thereof opposite the hub. A plurality of metal studs have disk-like heads embedded in the thicker portion of the shank and the studs project from the side of the shank opposite the thicker portion in a direction so as to strike the leaves and remove same from sugar beets and the like while such beets are still in the ground.

Abstract: A machine for spinning or twisting yarn comprises a plurality of similar operating units, groups of which are each drivable by a tangential drive belt and a drive having a motor. Each of the tangential drive belts is connected with a drive belt performance observation mechanism, which shuts off the spinning or twisting machine, when the machine senses a deviation from the normal operation of the drive belt. The drive belt performance observation mechanism may also transmit the signal it produces either to a display device or to a sound producing device, so that the machine operator can take further action.

Abstract: In the case of an open-end friction spinning machine having a plurality of spinning units, measuring devices are provided for examining the quality of the moving yarn at each spinning unit. Preferably, the tension of the yarn between a withdrawal device and the yarn forming point is measured which permits the drawing of conclusions concerning the respectively existing yarn twist. When deviations from an indicated quality are determined, measures are taken so that at least one parameter of the spinning conditions at the respective spinning unit is changed for eliminating the deviations.

Abstract: A fuel supply system for use in rotary wing aircraft is described. The system comprises a separating means 10 for: receiving an air, vapor and fuel mixture at relatively low pressure from a fuel tank; separating the air and the vapor from the mixture; and providing a fuel supply at a relatively high pressure, and a pump means 12 for returning the separated air and vapor to the tank.

Abstract: A hydraulic well pump for operating a pump sucker rod string including a hydraulic cylinder assembly for raising and lowering the sucker rod string and a fluid counterbalancing system for offsetting the combined weight of the reciprocating service equipment, the fluid column above the pump plunger, and the sucker rod string. One counterbalancing embodiment includes an air supported piston on the movable cylinder exposed to an air chamber below the air piston functioning independently of the hydraulic and power and logic system of the pump. Another counterbalancing system embodiment uses a hydraulic fluid accumulator connected into the system fluid power and logic for supercharging the hydraulic power pumps during the lift stroke and providing opposing force during the downstroke.

Abstract: A hydrostatic machine includes a casing (10) containing a rotary member (12) having radial cylinders (24) each with a piston (25) engaging a track ring (27). The member (20) is coupled to an external shaft (13) via reduction gearing (43,44) which also acts as a gear pump. This can be used to supply external power take-off fluid circuits, or an attached oil filter (64) or internal bearings (47,57) or make-up fluid for the machine via valve (42).

Abstract: Method of and apparatus for generating energy from a rolling or swiveling float tank utilizing the buoyant force of water contained therein. The float tank is mounted upon a central pivot to continuously swivel therearound. A series of flotation devices are mounted within the tank and forced upwardly by the buoyancy of the fluid volume shifting therein. The series of flotation devices are coupled to hydraulic cylinders or the like for transducing the energy resulting from the rolling flotation tank into a usable form. Swiveling of the tank is effected through a flow ballast fluid around the tank, the ballast transfer being affected by a central ballast discharge tank. The ballast fluid can be pumped from the tank or supplied externally to provide an efficient transducer system.

Abstract: A water engine comprises two floats arranged to reciprocate vertically in respective water chambers. Water is admitted to each chamber in turn from a head of water and then allowed to exhaust to a lower level, thereby causing the floats to rise and fall. The floats drive a pivotally mounted beam and power is derived from the beam movement by means of hydraulic rams.

Abstract: A hot gas engine operating with a Stirling cycle includes a cylindrical space filled with a process gas and containing one or two working pistons and one or two displacement pistons moveable longitudinally in relation to each other. The displacement piston or pistons are integrated with the respective regenerator. The working and displacement piston or pistons are associated with transmission gears constructed as thrust crank transmissions so as to convert rotary motion into longitudinal piston displacement motion and vice-versa.

Abstract: A thermal actuator is provided in which a thermally expansible material such as a high melting point wax is heated to produce linear movement of an actuator element. A secondary chamber containing a biconical mass provides a sealing chamber for the wax.

Abstract: A simple nitinol wire powered engine which employs a pair of interconnected drive members which oscillate in a horizontal plane about two different axes of rotation.

Abstract: A simple nitinol wire powered engine employing a four bar linkage which oscillates the nitinol wire in a vertical plane into and out of a pair of aligned different temperature baths.

Abstract: A master cylinder assembly of the type that a current quantity of operating fluid in the interior of a reservoir is detected by function of a float means, wherein the float means has an extension extending with its center of buoyancy disposed near the center line of the reservoir.

Abstract: A hydraulic vehicle brake system of the type having a high system return pressure is provided. In order to minimize the size and strength of brake return springs required, the invention provides a device to be interposed between the brake and the brake control valve. Preferred embodiments of the device include an inlet port communicating with a brake valve and an outlet port communicating fluid pressure to a vehicle brake. A control assembly is provided intermediate the inlet and outlet ports and includes mechanisms for amplifying the hydraulic pressure effect in the direction from the outlet port to the return pressure system so that the brake return pressure exerted by the brake return springs can be substantially less than the hydraulic system return pressure.

Abstract: The supercharger pressure control system includes a sensor for detecting the supercharger pressure of the engine and regulates the pressure through a variable geometry device or an exhaust bypass valve. The control for the pressure regulation is carried out by comparing the sensed supercharge pressure with a target value. Any difference determined by this comparison is accumulated by a computer as an error and a basic control value is determined based on the error. Alternatively, a predetermined basic control value for the engine intake air is corrected in accordance with the error and this control value or corrected value is used to control the operation of the supercharge pressure regulator. This causes the regulator to operate in a manner responsive to variations in performance of the engine or turbocharger, thus maintaining the supercharged pressure within a permissible range of a target value.

Abstract: A solar electric power generating process is described which consists of tapwater thermally contacted with special brine. Low pressure characteristics of the brine draw steam through a power generating turbine from the water into the brine. As the brine is pumped over an open air evaporator, excess water picked up by the brine is driven off using solar or waste heat.

Abstract: A thermodynamic process having an efficiency close to that of the ideal Carnot cycle. The process fluid is a combination of Dowtherm A and water and undergoes constant pressure transformations to absorb heat from a heat source and to transfer heat to a heat sink, and also undergoes constant temperature expansion and constant temperature pressurization. The process provides a practical application, in single-stage and three-stage processes, of the Carnot cycle.

Abstract: A method and apparatus for underground storage and recovery of energy is disclosed in which a first fluid having a relatively high density is pumped from the bottom of a second cavern to the bottom of a first cavern filled with a fluid having a relatively low density by means of an overground pump/turbine apparatus. The relatively low density fluid is displaced out of the first cavern to the second cavern through an overhead connection which is filled with the second fluid. The stored energy is retrieved as the high density fluid is allowed to return to the second cavern and drives the pump/turbine.

Abstract: A method of operating an absorption heat pump or refrigerator consisting at least of a refrigerant circuit and a refrigerant-containing solution circuit, with a generator for evaporating refrigerant from the solution with the supply of relatively high-temperature heat, a condenser for condensing refrigerant and giving up heat at an intermediate temperature level, an evaporator for evaporating refrigerant with the absorption of heat from a relatively cold heat source, a heat exchanger for transferring heat from the liquid passing out of the condenser to the refrigerant vapor and liquid coming from the evaporator, an absorber for absorbing refrigerant vapor into the solution with the giving-up of heat at an intermediate temperature level, and means for circulating the solution or maintaining the pressure, wherein the delivery of refrigerant is regulated in such a manner that the temperature differential .DELTA.t.sub.