US2793408A - Valve for core blowing machine - Google Patents

Description

y 1957 A. H. PETERSON VALVE FOR com; BLOWING MACHINE Filed Feb. 23, 1951 INVENTOR. 0%;156! H Pezi'fison United States Patent() VALVE FOR CORE BLOWING MACHINE Axel H. Peterson, Rock Island, Ill.

Application February 23, 1951, Serial No. 212,214 1 Claim. (Cl. 22-10 This invention relates to a valve of rugged and sturdy construction for handling flowable abrasive materials and/or for fluids.

More specifically this valve is adapted for use in combination with a core making machine of the character shown and described in my copending application, Serial No. 212,213, filed of even date herewith, which has now matured into Patent No. 2,702,417.

One of the most troublesome problems in controlling and conducting flowable abrasive materials has been to provide handling mechanisms that will have a practical life and that are arranged with parts that may be easily serviced and/or replaced. Onesuch mechanism is a valve and more specifically one thatis applied to a core making machine to control the compressed air from a suitable source of supply which air is directed into the core sand head of the machine to intermittently blow sand cores. Varying amounts of sand are always present in air lines used in foundry operation.

It is one of the main objects of the present, invention to provide a valve for carrying or conducting flowable abrasive materials and/or fluids particularly under pressure, and wherein the working parts thereof have been arranged for optimum efiiciency to protect thenrnoreexpensive and complicated parts from open wear due to free air borne or tramp sand that m'ay be carried by the fluids through the valve or which may be carried in the air that swirls or escapes from the sand blowing head, and to arrange all parts subject to fluid wear in readily accessible relations, easily serviceable and replaceable.

It is another object of the present invention to provide the main valve throat or metering means in the'form of a replaceable wafer having smooth parallel sides and being symmetrical in the plane thereof for use in any one of a number of positions when being reassembled after servicing or if replacement is required'by a like wafer.

Another object of the invention is to provide such a wafer of considerable thickness to permit refacing thereof several times, this wafer comprising the seat of the valve proper.

Still further objects of the invention resides in the simplicity of the valve parts; the ease with which they are assembled or disassembled; and the arrangement of the parts thereof, as for example, placing the gland structure away from the high pressure side of the valve.

Other objects and advantages relating to the valve of the present invention shall hereinafter appear in the following detailed description of the preferred forms thereof having reference to the accompanying drawings forming a part of this specification.

In the drawings:

Fig. 1 is a plan view of a core making machine embodying the valve of the present invention, certain portions of this combination being broken away and in section to illustrate the details thereof;

Fig. 2 is a fragmentary side elevational view of the valve of this invention as seen from the right in Fig. 1;

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Fig. 3 is an edge elevational view of the wafer portion of the valve comprising the seat therein;

Fig. 4 is a face view of the wafer; and

Fig. 5 is a modified construction of the valve shown in Figs. 1 to 4.

As one application of use, the valve 1 of this invention is shown as comprising an integral portion of the head 2 of a core making machine 3 wherein the valve 1 functions to admit air under pressure through a pipe 4 leading from a pressure supply source of air through a port 5 and exhausting into the interior 6 of the head 2. This valve also incorporates a tap connection at 7 to receive a pipe 8 for bypassing a considerable amount of air out of the discharge or distribution chamber 9 of the valve.

The salient manifold parts of the valve are best illustrated in Figs. 1 and 2 wherein the inlet opening 10 in a cup shaped head 11 provides the means for receiving the pipe 4, and cup 11 defines a chamber 12 which normally retains air at the same pressure as prevails in pipe 4. The second main portion of the valve includes a housing 13 surrounding the distribution chamber 9 and both the cup 11 and the housing 13 are provided with milled faces to receive a valve seat member or wafer 14 therebetween supplemented by gaskets 15 and 16 to prevent leakage of air out of the valve.

A number of bolts such as 17 pass through appropriate openings 18 in the cup 11 through non-threaded openings 19 in the wafer 14 and thread into-tapped holes 20 in housing 13. Obviously, the gaskets 15 and 16 also have appropriate openings through which the bolts 17 may pass.

As shown in Figs. 3 and 4, the wafer 14 is a thick plate having a central orifice 21 through which the air passes from the cup chamber 11 to the housing 13, and the wafer is bodily interposed between these housing members. The housing members 11 and 13 have their open ends cooperatively disposed adjacently, and each ofthese members terminates in wallends disposed in coplanar relationshipfor contact with the opposite sides of the thick plate wafer 14. Furthermore, the wafer forms a dividing wall between the housing members providing valve seat portions that are suspended into the housing area for cooperation with the valve structure.

Cooperating with the wafer 14 is a valve 22 suitably secured to the rod 23 which passes through the gland nuts 24 and 25 that are alike and each threaded into a boss 26 carried by the housing 13 to confine suitable packing 27 between these sleeve nuts. Normally, the nut 24 is threaded in tightly with the head against the exterior face of the boss 26 in chamber 9 and the sleeve nut 25 projecting exteriorly of housing 13 can be tightened from time to time to compress the interposed packing 27 whenever necessary.

Push rod 23 extends through the gland arrangement and terminates with a suitable tongue 28 which can be appropriately connected to any type of operating mechanism.

The present arrangement of operating mechanism comprises a link means which is connected to actuate a pressure relief valve 29 that suitably closes a relief vent 30 carried in the head, and this mechanism is substantially explained and described in my Patent No. 2,702,417.

The link means includes a spring 31 connected between a fixed pin 32 and a bar 33 to normally react through an arm 34 to urge a cross shaft 35 connected with an operating handle 36 in an outward direction as viewed in Fig. 1 to normally hold the valve 22 in closed position against the wafer 14. Any other type of spring means may be interposed in the valve structure itself to normally keep the valve 22 in closed position against the wafer 14 supplemented by the action of the air pressure in the cup housing 13, one such arrangement being illustrated in the modification in Fig. 5. The valve construction described permits easy replacement of the actual valving parts as well as the gland structure elements which are readily accessible from inside of the valve when the bolts 17 are removed to disassemble the entire cup housing 11 and the wafer for servicing and replacing of the valve parts. By providing a thick initial wafer, the side adjacent the high pressure end of the valve which will normally be subjected to the most wear by the mixture of air and tramp sand passing through the valve can readily be refaced whenever necessary, reassembling the valve and the wafer to continue the same in operation. Furthermore, the gland nuts 24 and 25 are identical and may be easily replaced whenever Worn to an inefficient stage through'the operation of the valve or the contents passing therethrough.

The modification shown in Fig. illustrates a valve which may be bodily fastened to any structure necessitating the use of such a valve. The construction'of the Fig. 5 valve is substantially identical to the one illustrated in Figs. 1 and 2, except that the housing 13 which is indicated at 13a terminates in a suitably shaped securing flange 37 and by means of which the entire valve can be connected to a support or similar flange of an associated mechanism. In this illustration, the bypass aperture 7 is shown as closed with a removable plug 38 and the valve stem 23a is here elongated to provide a long external stem 39 having a cross pin 40 holding a collar 41 and a spring 42 which is interposed between the collar 41 and the outer head end of the gland nut 25. Spring 42 in this construction normally maintains the valve 22 in closed position against the wafer 14.

The above description relates to a preferred embodiment as illustrated in two forms thereof of the valve of the present invention, and it is to be understood that certain changes and modifications may further be made therein without departing from the fundamental concept of this invention. Such modifications shall, however, be limited by the breadth and scope of the language of the claim appended hereto.

What I claim is:

In a core making machine, a valve unit adapted for interrupting the passage of fiowable abrasive materials through a conduit system comprising a pair of housings having adjacent material carrying chambers together forming a continuous conduit having inlet and outlet portions for the transfer of such materials through said housings; the first of said housings containing a threaded opening aligned with said conduit, providing the material receiving unit and comprising a complicated head structure of a core making machine; the second of said housings comprising a material supply unit for said first housing and consisting of a relatively simple and readily replaceable structure; a valve seatinterposed between said inlet and outlet portions comprising a simple thick and readily replaceable wafer having flat radial surfaces, and an orifice of smaller diameter than adjacent portions of said conduit formed through the thickness of the wafer, said housings each terminating with flat radial ends engaging the flat radial surfaces of said wafer therebetween; a valve comprising a head and a stem, said head having a fiat surface engaging a fiat radial surface of said water proximate to said inlet end when said valve is closed, said stem having an end extending through said orifice secured to said head and an end extending through said threaded opening, opposed threaded bushings received by said threaded opening and embracing said stem, packing material embracing said stem between said bushings, and valve actuating means connected with the end of said stem extending through said threaded opening to move said valve towards and away from said wafer to regulate the flow of the abrasive materials.

References Cited in the file of this patent UNITED STATES PATENTS 436,491 Barnes Sept. 16, 1890 946,249 Meyer Jan. 11, 1910 1,302,567 La Bour May 6, 1919 1,643,370 Brannen Sept. 27, 1927 1,664,816 Hansen Apr. 3, 1928 1,690,849 Barrymore Nov. 6, 1928 2,222,926 Young Nov. 26, 1940 2,344,703 Kemper Mar. 21, 1944 2,543,598 Peterson Feb. 27, 1951 2,611,938 Hansberg Sept. 30, 1952 e.-wW="! w-fl= Jim; 0

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