US2839798A - Core blowing apparatus - Google Patents

Description

June 24, 1958 m c s 2,839,798

' CORE BLOWING APPARATUS Filed Feb. 17, 1954 2 Sheets-Sheet 1 .T. l INVENTOR.

//4M9 & Ian's Kicks BY \gzz fwm June 1958 H. G. HINRICHS CORE BLOWING APPARATUS 2 Sheets-Sheet 2 Filed Feb. 1'7. 1954 U i ed S ates Patent CORE BLOWING APPARATUS Hans G. Hinrichs, Hillsdale, N. Y., assignor, by mesne assignments, to Archer-Daniels-Midland Company, Minneapolis, Minn.,;a corporation of Delaware Application February-17, 1954, Serial No. 410,798 2Claims. (Cl. 22-10) ,This invention relates generally to improvements in the production of sand cores and more particularly relates to an improved arrangement for changing the apparatus to efliciently accommodate various types of core boxes in accordance with different job requirements.

, .Molds or cores are usually produced by a "type of apparatus in which the core material such as sand is fed into a sand chamber above a table upon which a core box is'place-d and an air stream is then charged into the chamher under suitable pressure to blow or force the sand through openings in the base of the chamber into entry passages in the core box. which lead to the core forming cavities. Since the core cavities and the entry passages vary in number and configuration in accordance with the type of core to be formed,v a fixed number and location of apertures in the sand chamber base cannot efliciently accommodate different types of core boxes.

Accordingly, it is a principal object of this invention to provide an arrangement for changing the number and location of the sand chamber blow openings to accommodate'various types of core boxes in accordance with different job requirements. Another object of this invention relates to the provision of an arrangement which will permit selective masking of the sand chamber blow openings to accommodate different types of core boxes.

Briefly, this invention is directed to an improved arrangement for a core blowing sand chamber having a blow plate witha fixed number of blow openings physically disposed in fixed relation to each other and adapted to. surmount a core box vent plate which in turn is intended to surmount and communicate with a core box. The vent plate also has a fixed number of openings disposed in fixedrelation to each other, some of which are in communication with the openings in the blow plate, and others of which are in communication with the atmosphere for venting purposes. In accordance with my invention, provision is made for separating the vent plate from the sand chamber blow plate to permit the introduction of a masking plate also having a fixed number of openings physically-disposed in fixed relation to each other, the number and physical disposition being different from that in the chamber blow plate, whereby the masking plate will isolate certain blow plate openings from the vent plate openings and from communication with a particular core box. 'Provision is also made for clamping the masking plate in position within the vent and blow plate assembly. Preferably, the number and physical disposition of the openings in the masking plate bear a predetermined relation to a selected core box configuration.

In the drawings:

Fig. l is a side elevation of the core blowing apparatus showing the sand chamber and associated parts in section;

Fig. 2 is an enlarged side elevation of the lower portion of the sand chamber illustrating the configuration of the blow and vent plates when assembled with masking plate;

Patented June 24, 1958 Figs. 3 and 4 are plan views of various configurations of the masking plate.

The sand blowing apparatus illustrated in Fig. 1 em-v bodies an enclosed vertical frame having a base 10, and a vertically spaced cross head 11 interconnected with spaced vertical columns 12 and 13 to form a rigid load distributing supporting structure. Within the top portion of the enclosed frame is a sand transfer chamber 14 which is pivotally supported on each side by arms such as shown at 15 and 16, each extending from pivotal connections at the column 12 to enable limited vertical movement of the transfer chamber within the'frame. In normal use, the transfer chamber would be filled with sand from a-hopper 17 which may be supported on the column 12 external to the enclosed frame'in which case the supporting arms such as 15 and 16 could be coupled to a journal 7 18 rotatably mounted on the column 12 to swing the 21 in the base of the enclosed frame for positioning a sand receptacle such as a core box 22 into core blowing engagement with the base of the transfer chamber 14. Thus, when fluid pressure is supplied beneath the lift piston '20 the core box 22 is positioned upwardly against a is rotatably mounted at the top of they partition 36.

te base of the transfer chamber and the entire assembly positioned against a cover 25. 'In the preferred form shown, the cover 25 is carried by an arm 26 extending from the column 12 and is adjustable in a vertical direc-' tion by means of the spindle and hand wheel designated generally at 30. Fluid pressure is supplied to the sand chamber 14 through a port 31 in the cover which is coupled to a supply line 32 leading from a control valve 35 mounted on the cross head 11. Air pressure is supplied to the control valve 35 and to the lift piston cylinder 21 from a source of pressure in a conventional manner, not forming part of this invention and, therefore, not shown.

In the preferred arrangement shown in Fig. 1, the sand transfer chamber 14 has an inner perforated partition 35 forming a sand room surrounded by an air jacket all of which is closed at the bottom by a removable blow plate closure 40. An agitator 37 is rotatably supported within the sand room from a driving ring gear 38 which The ring gear 38 is in turn driven by a spur gear 39 which is disposed outside the sand room and within the air jacket of the chamber for protection against sand and dirt. The gear arrangement may be coupled to a motor or similar drive means to rotate the agitator 37.

The blow plate is provided with a plurality of discharge openings 41 which communicate with aligned openings 43 in a venting plate 45 surmounting the core box. Thus, in operation, the sand transfer chamber 14 is filled with sand by swinging it under the externally supported hopper 17 and then it is swung back into core blowing position within the closed frame after which the lift piston 20 positions the core box 22 into operative engagement below the vent plate 4'5 and in turn raises the entire assembly against the cover 25 so that air pressure may be admitted through the port 31 to blow the sand through the discharge openings 41 and 43 into the core box, where it passes through entry passages into the core cavity. In the preferred form illustrated, the vent plate 45 has additional venting openings 44 which vent the core box to atmosphere during the blowing operation. Suitable bushings 49 are provided to establish communication between the discharge openings 41 and 43 when the plates are assembled as shown.

It is readily apparent that when different types of configurations of cores are to be made, the cavities and the entry passageways are changed accordingly, and the disposition of the'discharge openings 41 in the blow plate may not be as advantageously located for one type of core box as for another, resulting in inefficient transfer of sand and imperfectly made cores. Accordingly, as best shown in the enlarged sectional elevation of Fig. 2, the vent plate 45 is preferably hinged through a supporting arm 46 and pivot pin 47 to a bracket 48 extending from one side of the sand chamber 14 so that it may be dropped away and separated from the blow plate 40 to provide access to the space below the blow plate. Such access permits the insertion of a masking plate 50 having substantially the same configuration as the chamber blow plate 40 but having a different disposition of discharge openings 51. Two different configurations are shown in Figs. 3 and 4 of the drawings.

In the preferred embodiment illustrated, the vent plate 45 is also supported on the sand chamber 14 by an arrangement which permits separation of the blow and vent plates sufficiently to receive a masking plate 50 which at the same time maintaining the desired alignment between the blow and vent plates. This arrangement includes an eccentric shaft rotatably disposed in a sleeve 61 which may be an integral part of the sand chamber Wall. The eccentric extremity of the shaft 60 terminates in a handle 62 disposed at right angles to the plane of the shaft and capable of rotating the. shaft within the sleeve 61. A lever rod 63 is loosely carried at one end by the eccentric portion of the shaft 60 and has its other end coupled to a bracket 65 extending upwardly from the vent plate. Thus, when the handle 62 is in the vertical position shown, the eccentric portion of the shaft 60 acts to raise the lever rod 63 and clamp the vent plate against an interposed masking plate 50. The masking plate 50 may be removed and replaced with another by simply turning the handle 62 down to lower the lever rod 63 and separate the vent plate as indicated by the dotted lines in Fig. 2. Thus, when the job requirements change and a different core box is positioned on the lift piston 20, the handle 62 will be operated to lower the vent plate 45 sufficiently to permit insertion of a masking plate having a configuration corresponding to the particular core box to be blown. The masking plates 50 are preferably made of metal such as Zinc or the like, and are more economical in use and cost than changing the blow plate of the sand chamber for each different core box.

Thus, there has been provided an arrangement for changing a core blowing apparatus to efficiently accommodate various types of core boxes in accordance with different job requirements. The arrangement permits separation of the vent plate from the blow plate sufliciently to permit the insertion of a masking plate which will coact with the sand discharge openings in the blow plate in a selected manner having a predetermined relationship to the particular core box being blown to provide efficient transfer of sand and optimum core production.

I claim:

1. In combination with a sandtransfer chamber having an open base closed by a blow plate with a plurality of spaced sand discharge openings adapted to surmount a core boxcavity, a vent plate having a greater number of spaced openings, means for separably supporting: the vent plate below the blow plate with the openings of the blow plate aligned with some of the openings in the vent plate, said means including a pivotal connection between opposite edges'of theivent plate and opposite sides of the sand chamber respectively, one of said pivotal connections including an eccentric pivot shaft adapted to be rotated to permit limited separation of the vent plate from the corresponding edge of the blow plate; and externally accessible means for rotating said eccentric pivot shaft.

2. In combination, with a sand transfer chamber having a base closedby a blow plate provided with a plurality of spaced sand discharge openings and adapted to surmount a core box cavity, a vent plate having a plurality of similarly spaced openings, and means for separably supporting the vent plate below the blow plate with the openings in each plate aligned, and means coacting between the chamber and'the vent plate to selectively separate the vent plate away from the blow plate a limited distance, said last mentioned means including an eccentric shaft mounted for rotation on the transfer chamber" References Cited inthe file of this patent UNITED STATES PATENTS 415,328 Payen Nov. 19, 1889 1,998,316 Guyot Apr. 16, 1935 2,598,621 Taccone May 27, 1952 2,636,230 Morton Apr. 28,1953 2,656,575 Herbruggen Oct. 27,1953 2,789,325

McKee Apr. 23, 1957"

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