US2611938A - Machine for ramming foundry cores by means of compressed air - Google Patents

Description

Sept. 30, 1952 F. HANSBERG 2,611,938

MACHINE FOR RAMMING FOUNDRY CORES BY MEANS OF COMPRESSED AIR Filed Oct. 15, 1949 4 3 4 4 4 4 4 C .2; iA/mvro/a Patented Sept. 30, 1952 FOR RAMMING FOUNDRY GORES BY MEANS OF COMPRESSED AIR Fritz Haasterg, Milan, Italy Application October 15, 1949, Serial No. 121,485 In- Italy J une 15; 194-9 The present invention relatesto a machine f -or introducing and tamping casting sand into care moulds in order quickly to obtain the formation of cores to be introduced into the castings.

It is an object of the present invention to provide a machine allowing for rapid preparationof cores of any size and shape, by means of mere valve adjustment. Other advantages of the invention Will appear from the following description.

The machine according to; theinvention is essentially composed of a hollow body adapted to contain the casting sand and provided with one or more discharge months for discharging in the direction of a support for core moulds; compressed air is introduced into said hollow body by means of a conduit, which is connected there: to through a valvehaving alarge aperture-andbeing quickly operable, which valvegmay-bepreceded by another valve for adjustable throttling,- which latter valve has a smaller aperture than the first valve.

The accompanying drawing represents a vertical section of one embodiment of themachine according to the invention. I

In the embodiment diagrammatically represented in the drawing; the inachine -is'composed of a hollow standard or column I, whose inner cavity acts as a compressed air receiver-or storage tank. To the standard I there is connected by way of the bracket 2, the cylindrical body 3 constituting the said storage tank; the walls of I the cavity of the body 3 a're-lined-with a p'erfo rated metal liner 4 which forms-an annular channel with the cylinder wall.

The lower head5 of the cylinder 3 comprises a conical part 6 termmated by a central hole forming the seat for a replaceable nozzle 1'. Outside the cone 6, the head 5'com'prises a charn-ber 8 open inside by wayof a plurality of holes 9 covered by a metal wire gauze: ornetwork- Ill;

The bracket 2 carrying the cylinder 3 is rotatable about the standard l and can be locked at the top against a head H containing a conduit [2, which is in communication with the cylinder 3 by way of a comparatively wide valve l3, and with the inside of the standard I by Way of a valve having smaller dimensions l4. Valve 13 is extended to form a irusto-conical guide member 13 which together with the upper conical section 3' of the sand chamber provides an annular channel aligned so as to direct compressed air into the channel between cylinder 3 and liner 4.

The valve [3 is controlled by means of a servomotor Whose piston 15 is pushed by the com- 2 pressed air entering. through the aperture l6 comtrolled by a suitable valve not represented in the drawing.

The valve I4 is controlled t means' of the hand-'- whee screw n so thatits aperture can be ad justed at any time as needed.

Below the cylinder 3, abra'cket l8 iasteried to the standard 1 supports a corej niculd carry ingplate' (9,, which sway of astem 20 integral or rigidly connected w til 2% piston if, :w ich too is displaceabl by means of compressed air so as to 1m the core-mould carrying plate 9 against the cylinder a": v U r V th 22 are indicated paekm'gsfof elastic ma terial' and with 23 is indicated a spring reacting against "the piston l5. V r I operation or the machine is as follows: i

The cylinder 3 i's'filled with casting" sand'and then tightly locked under the head ll. On the ate l9 there" is fixed; or examp e by of a pneumatic damp or a nown type, c re mould :5 in such arfiann'er' that asuppetioiiei lih'g isplaced below the' nozzle" (arid is partly w covered by the holes a, f; compressedfla 'is', introduced throughtli'e opriiiiglfif, tliepis'ton 5 rises against the 'reacticn' of the spring 23" and very" rapidly" opens the valve; whence; can; pressedair enters: hefc'yli'rid'e'r 3 and no top as,,we11' a lateraliy' thr" g liner'qfpresssthe-sand c'o therefore; is 'forcedyiole'ntly out tn pletfely" until" the sand comes in fo'rced'lc the man fg'r'ating l cap-es through the mes: 9 a ber amen "d'i'scharges'toit eatiil'osphere' 't' peripheral holes 9" or th r'ou'ghflar ger ele holesi 2'6"that' may be" provided atariytantinefiti int. L i l 7 Durin this operation; tl'i'ecor'et d against the inner surface of the" headseftfie plate l9 by the action of compressed air acting against the piston 2i when this compressed air is released, the plate [9 goes down again and the core-mould with the formed core can be easily and quickly removed.

The operation of injecting sand into the coremould is extremely rapid, so as to deserve being end the valve l4 should be acted upon by'means nevertheless equally rapid and perfect in every case.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is:

4 flow of compressed air into said sand chamber upon opening of said valve means.

3. A core blowing machine employing compressed air, comprising in combination a frame structure including a substantially tubular vertically disposed sand chamber, one end of said chamber forming a narrow nozzle for discharging sand into a core box and theother end a wider air inlet opening for admitting compressed air into the sand chamber, a tubular lining member including transverse openings therethrough dis- 1. A core blowing machine employing compressed air, comprising in combination a frame structure including a sand chamber having a wide air inlet opening and a narrow sand outlet opening, valve means disposed in said inlet opening for controlling the admission of compressed air into said chamber, valve control means for opening and closing said valve means, and a lining member including a plurality of transverse openings therethrough disposed within said sand chamber spaced apart from the chamber wall and open ended at the side facing the valve means, said valve means including a valve body and a guide member mounted on the side of said valve body facing the said chamber and movable in unison with the valve body, said guide member being shaped and positioned relative to the space between the chamber wall and the lining member so as to direct compressed air into the said space and to provide space for the flow of compressed air into the sand chamber upon opening of said valve means.

2. A core blowing machine employing compressed air, comprising in combination a frame structure including a substantially tubular vertically disposed sand chamber, one end of said chamber forming a narrow nozzle for discharging sandinto a core box and the other end a wider,

air'inlet opening for admitting compressed air.

into the sand chamber, a tubular lining member including a plurality of transverse openings therethrough disposed within said sand chamber concentrically therewith and spaced apart from the wall of the chamber so as to form an annular open channel between the lining member and the chamber wall, and valve means for controlling the'rate of flow of compressed air, valve control means for opening and closing said valve means, said valve means including a valve body seated on said inlet opening and a guide member secured to'the valve bodyon the side thereof facing the sand chamber, said guide member being shaped and positioned to direct compressed air into said annular. channel and to provide space for the posed within said sand chamber concentrically therewith and spaced apart from the wall of the chamber so as to form an annular open channel between the lining member and the chamber wall,

said sandchamber having a substantially frustoconical section positioned above said lining member, the narrow end of said section including said inlet opening, and valve means for controlling the rate of flow of compressed air through said inlet opening, valve control means opening and closing said valve means, said valve means including a valve body' seated on said inlet opening and a guide member secured to the valve body on the side'thereof facing the sand chamber and the lining-member therein, said guide member having a substantial frusto-conical shape and being positioned within said' conical section so as to form 'a secondannular channel therewith, said latter channel being aligned so as to direct compressed air into the annular channel formed by the lining member and the tubular section of the sand chamber upon opening of the valve means, a space being interposed between the adiacent ends of theguide member and the lining member so-asto" provide for a flow of compressed air leaving said second channel into said tubular sectionof the sand chamber upon opening of the valve means.

FRITZ HANSBERG.

-REFERENCES cirnn The following references are of record in the file of this patent:

UNITEDSTATES PATENTS Number Name Date 1,022,363 Harrison Apr. 12, 1912 1,086,824 Hewlett Feb. 10, 1914 1,447,376 Campbell Mar. 6, 1923 1,950,632 Romph Mar. 13, 1934 2,259,768 Naylor 1 Oct. 21, 1941 2,300,148 Gilliland Oct/27, 1942 2,490,559 Taccone 1 Dec. 6, 1949 FOREIGN PATENTS Number Country Date 557,503 Germany Aug. 24, 1932 657,498, Germany Mar. 5, 1933 154,245 Switzerland Apr. 30, 1932

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