US 2739612 A
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March 27, 1956 H. J. HANSEN PROCESSING CONNECTOR Filed March 7, 1955 &
S @W S N M FR O H T MN m mu AV. 1 A V M limited States Patent PROCESSING CONNECTOR Howard J. Hansen, Bay Village, Ohio, assignor to The Hansen Manufacturing Company, Cleveland, Ohio, a corporation of Ohio Application March 7, 1955, Serial No. 492,637 3 Claims. (Cl. 137-614) This invention relates to improvements in processing connectors, that is to say connectors used for controlling the flow of fluid in one or both directions during the filling or opening of a chamber or system to be processed, one use of the invention being in the preparation of or repreparation of electric refrigerators for use.
In the processing of a refrigerator it is necessary to do several things. First, the piping system should be tested by subjecting it to considerable air pressure, 250 lbs. for example, in order to make sure that there are no leaks in the system. Then the air should be exhausted as completely as possible, and after that the refrigerating gas should be permitted to enter the system and fill the vacuum. At some stage in the procedure, preferably directly after the testing step is completed, the system should be dried out, this being accomplished for example by passing hot air through the system.
It is important to conserve power in the operation of exhausting air from the piping system, and the connector of this invention assists materially in the conservation of power. The processing connector is preferably in two parts which may be rapidly coupled or uncoupled, one part being a valved plug permanently installed in the refrigerator, the other part being a removable cylindrical part adapted to receive an air connection, a vacuum connection or a gaseous refrigerant connection, but this removable part includes an axially movable wrench that may be employed to actuate the valve in the plug.
The coupling together of the two parts of the processing connector opens a valve in the movable part. With the two parts coupled and the screw valve in the plug open a vacuum pump may be attached to'the movable part and the air in the system exhausted through the two open valves. Then the screw valve may be closed by the wrench without uncoupling the parts, after which the pump may be disconnected and the supply line for refrigerant connected. Then the screw valve may be opened by the wrench and the refrigerant permitted to enter and fill the piping system of the refrigerator. When the system is filled with refrigerant, the wrench may be operated in the opposite direction to close the plug passage and the refrigerator will be ready for use.
One of the objects of the invention therefore is the provision of a connector by means of which the processing steps above referred to may be carried out conveniently, promptly and without loss of vacuum or pressure during a change in connections.
Other objects and features of novelty will appear as I proceed with the description of that embodiment of the invention which, for the purposes of the present application, I have illustrated in the accompanying drawing, in which Fig. l is a longitudinal sectional view of my processing connector, both valves being open;
Fig. 2 is a similar view of the removable part of the connector, showing the valve in that part closed;
Fig. 3 is a longitudinal sectional view of the plug with the screw valve therein closed, and
2,739,612 Patented Mar. 27, 1956 Fig. 4 is a cross sectional detail view on a larger scale, the view being taken substantially on the line 4--4 of Fig. 3.
The connector of the present invention embodies two parts shown separately in Figs. 2 and 3 of the drawings, which parts are adapted to be coupled together when the device is in active use, the act of coupling them serving to open the valve in the removable part. The plug part of the connector, shown at 10, is permanently connected with a chamber or system to be serviced, for example the piping of an electric refrigerator. This plug has an annular projection 11 and an annular recess 12. It is provided with an axial passage 13 which merges with another axial passage 14 of somewhat larger diameter, the juncture of the two passages forming a valve seat 15.
The rear end of passage 14 is threaded as indicated at 16 to receive a threaded valve piece 17 which is adapted to close the valve seat 15. The rear end of valve piece 17 is enlarged and threaded to screw into the threaded passage 16. At its rear extremity it has a splined socket 18 which connects with a short axial passage 19 terminating in a transverse passage 20. The rear end of passage 16 is therefore connected at all times with the forward end of that passage through the passages 18, 19 and 20.
The female part of the connector, shown in Fig. 2, comprises a cylinder 22 with a laterally extending nipple 23 intended for connection with a flexible hose, not shown, leading to a pressure pump or a vacuum pump or to a supply of any fluid material which it may be desired to deliver or withdrawn through the connector. The forward end of the cylinder 22 is adapted to receive the reduced rear end of plug 10, the cylinder including detent balls 24 that are adapted to take into the annular groove 12 of the plug. In order that the two parts of the coupling may move relatively into coupled relation, a sleeve 25 is mounted exteriorly on the cylinder, adapted to be slid to the right against the operation of spring 26, from the position shown, in order that reliefs 27 in the sleeve may be disposed around the balls 24 to permit the latter to ride over annular projection 11 and into the groove 12, after which the sleeve may be permitted to return to its normal position, holding the balls 24 inwardly and looking the coupling members together. Quick detachable couplings of this general character are old in the art, as for example in Hansen Patent 2,548,528. It may be observed also that a spring ring lock may be substituted for the detent balls illustrated herein.
When the coupling is assembled the nose at the rear of plug 10 strikes against and shifts to the right the reduced forward end of a cylindrical piston 29. This piston is normally urged to the left against an annular stop 30 by a coil spring 31 in the rear end of the cylinder, the spring yielding when the parts are moved into the coupled relation illustrated in Fig. l. The reduced forward end of the piston has one or more ports 32 therethrough. When the piston is pushed back as in Fig. 1 these ports bring the interior of the piston into communication with the passage 33 in nipple 23.
A wrench 35 with a shaft 36 round in cross section is projected through a round hole in the back end of cylinder 22 and into the bore of hollow piston 29. Its forward end is splined as indicated at 37, the splines being finished to fit the splined socket 18 in the screw valve 19. Spring 38 surrounding shaft 36 tends to withdraw the wrench to the position indicated in the drawing, its movement in that direction being limited by a snap ring 39 mounted in a groove 40 in the wrench and contacting the surface of an end cap 41 of the cylinder 22. When the coupling is made, as in Fig. 1, the operator may push the wrench 35 forwardly until the splines 37 enter the splined socket 18, after which the wrench may be turned by its handle 42 to screw the valve piece 17 in the plug either toward or away from its seat 15.
O-rings 44, 45, 46 and 47 or other suitable ring packings may be used to seal the slide joints of the device against fluid leakage.
When servicing a refrigerator, either at the time of manufacture or at some later time, the operator assembles the movable part 22 of the connector upon the fixed plug 10. He can then attach a pressure line to the nipple 23, unscrew the valve piece 17 and let compressed air enter the pipe system of the refrigerator. He can then attach a gauge to nipple '23 to test the system against leakage. Thereafter he can disconnect the pressure line and let the exhaust enter the atmosphere. Next he can attach a vacuum line to the nipple 23 and operate a pump to exhaust the air from the system. When the exhausting step has been carried as far as possible the operator advances the wrench 35 and turns it to close the valve piece 17 against its seat 15. He can then disconnect the vacuum pump line from the nipple and connect the refrigerating fluid line thereto. Now he pushes the wrench forward and turns it to withdraw valve piece 17 from its seat, whereupon the vacuum in the system will cause'the gaseous refrigerant to enter and fill the system. The operator thereupon closes the valve 17, 15 and the refrigerator is ready for use.
Having thus described my invention, I claim:
1. In a processing connector, a cylinder with a lateral port, a cylindrical piston slidable in said cylinder having a lateral port adapted to register with said first named port, spring means for biasing said piston to close said first named port, a plug having an axial passage therethrough, quick connective means for joining said cylinder and plug and simultaneously shifting said piston to position to open said lateral port against the action of said spring means, a screw valve in said plug coaxial with said passage, and a Wrench adapted to engage said screw valve for turning it to open or closed position, said wrench being movable slidably and rotatably in said cylindrical piston.
2. A processing connector substantially as defined in claim 1, wherein said-quick connective means comprises detent means biased toward position to lock said cylinder and plug together and to maintain said cylinder port in open position, and means for releasing said detent means whereby the cylinder and plug may be separated and said piston returned to cover the lateral port of said cylinder.
3. A processing connector substantially as defined in claim 1, wherein said screw plug is provided with internal splines and said wrench with interfitting external splines, whereby the wrench may be advanced axially to operative position and then turned to screw or unscrew said screw valve to close or open said axial passage.
References Cited in the file of this patent UNITED STATES PATENTS 865,713 Lamouroux Sept. 10, 1907 1,073,719 'Iimmer Sept. 23, 1913 2,638,914 Flaith May 19, 1953