US2672664A - Magnetic form for use in making molds - Google Patents

Description

March 23, 1954 cfsu zm sK 2,672,664

MAGNETIC FORM FOR USE IN MAK ING MOLDS Filed May 24 1951 EUGENE SUDZIARSKI INVENTOR.

2 Sheets-Sheet l March 23, 1954 E. c. SUDZIARSKI MAGNETIC FORM FOR USE IN MAKING MOLDS 2 Sheets-Sheet 2 Filed May 24 1951 lllll lli l/77,711! I/// /7' EUGENE SUDZlARSl fl INVENTORU Patented Mar. 23, 1954 UNITED STATES PATENT OFFICE MAGNETIC FORM FOR USE IN MAKING MOLDS This invention relates to the forming or making of molds in metal or other foundry work, and

more particularly to forms for forming pouring basins, riser locator impressions, etc. in sand molds. Heretofore it has been the practice in the forming of sand molds to attach the forms for making pouring basins, riser locators or the like in the sand mold, to the squeeze board by bolts so that the forms may be located in various positions on the squeeze board depending upon the pattern from which the mold is made. This not only requires the employment of squeeze boards having a large number of bolt receiving holes therein to allow for the attachment of the forms to the board in the location required, but requiring considerable labor time consumption in removing the bolts, relocating the form and rebolting it to the squeeze board. The useful life of such squeeze boards, forms and bolts is comparatively short due to the wear and tear thereon occasioned by the many changes required, particularly in instances where only a few molds are made at one time from one pattern.

The principal object of the present invention is the provision of forms for use in making foundry molds which are magnetically attached to the squeeze board and may be manually removed therefrom and replaced. in any desired location, completely eliminating the use of bolts and greatly reducing the labor time required to make the change of location of the forms on the squeeze board. The magnetic forms materially cut down the time required to make a mold and consequently reduce the cost of mold production, and the present invention also increases the useful life of the forms and squeeze boards in that the wear and tear as occasioned by changing the position of bolt attached forms is eliminated.

The use of the present invention not only results in savings to the foundry operator but enables molders, most of whom work on a piecework or incentive scale of wage plan, to make more molds in a given length of time and consequently increase their wages.

With these and other objects in view, as may appear from the accompanying specification, the invention-;-.consists of various features of constructionand. combination of parts, which will be first described in connection with the accompanying drawings, showing a magnetic form for use in making molds of a preferred form embodying the invention, and the features forming the invention will be specifically pointed out in the claims,

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, Figure lis a viewofanordinarytype of tamping sand-mold-forming machine with a flask thereon which is shown in section to illustrate the manner in which the squeeze board-carried magnetic forms work.

Figure 2 is a plan view of a magnetic pouringbasin-making form constructed in accordance with the present invention.

Figure 3 is a cross section through the pouringbasin-making form and taken on the line 3-3 of Figure 2.

Figure 4 is an enlarged detail view partly in section of the pouring-basin-shaping form.

Figure 5 is a plan view of a modification of the pouring-basin-making form.

Figure 6 is a side elevation of the modified form shown in Figure 5 of the drawings.

Figure '7 is a section through a magnetic riser locator impression-making form.

Referring more particularly to the drawings, the molding machine generically indicated at A in Figure 1 of the drawings is of any approved type of molding machine which may be purchased upon the open market and it includes the pattern plate supporting table B and the squeeze board carrier 0 to which the squeeze board I is attached in the usual manner. In the making of molds, a pattern plate 2 carrying a section of the pattern 3 from which the mold is to be made is placed upon the table B and a flask D of usual construction is placed upon the pattern plate 2 about the pattern, as shown in Figure 1 of the drawings. The pattern 3 includes the pouring riser forming section 4 and the outlet forming riser 5 as is ordinary in pattern construction. After the pattern and flask have been properly positioned on the table the flask is filled with sand, shaken down and tamped by the vibration of the table B, and the swingable head structure E of the molding machine which carries the squeeze board I is then moved into position over the flask and the sand in the flask is then further packed and tamped between the squeeze board I and the pattern carrier plate 2 in the usual manner. In the making of a mold it has become the practice to use forms carried by the squeeze board I to make the pouring basin shown at 6 and in some instances a form to make an impression in the mold in alignment with the outlet riser 5, and it is with such devices that the present invention is concerned. As hereinabove stated, it has been the general practice to attach pouring basin impression-making form and the riser locator impression making form to the squeeze board I by bolts which due to the fact that the position of these forms on the squeeze board must be changed with every dilferent pattern from which a mold is formed results in time-consuming costly labor and reduces the rate of production of molds, as well as causing considerable wear on the squeeze boards, bolts and forms, making it necessary to replace the squeeze boards, etc., quite frequently.

The present invention embodies a combination of squeeze board and impression-making forms which eliminates'the use of bolts with their companionable high labor costs and replacement costs. In carrying out the present invention, the squeeze board I has a metal plate 10 attached to its under surface in the event that the squeeze board is made of wood or a metal which is not subject to magnetic attraction.

Figures 2, 3 and 4 show a pouring basinor impression-making form H which is molded in the desired shape out of any suitable therrno-setting plastic and which has a U-shaped electric magnet lTembedded therein with its opposite polar endsindicated at I3 and Mfiushwith the upper flatisqueezeboard engaging surface of the form II, as clearly shown in Figures 2 and 3 of the drawings so'thatithe magnetic actionof the magnet 'lt will hold'the form I i against the squeeze board I in any desiredposition on the bottom of th'ezsque'eze' board.

Due'to the faotithat there considerable vibration in the operation of the molding machinenA "duringthe iormingof a mold, the form H may slip' slightly or slightly alter its position on thefsqueeze'board Ill and to prevent such action a suction cup l.5f-.is'- carried by the mold H. 'I'l-iesuction cup '[5 is made'of rubber, synthetic rubber or other-suitable resilient material as is usual in the construction of ordinary type of suction cups, and it maybe attached rigidly to the body of'the form H'in any suitable manner. In the'drawinga'however, a threaded stud 16' isshown attached. to'the suction cup i5 and embedded in the-thermo-setting plastic of which the form made. The 'thermo-setting plastic, hardening in the threads of the stud will securely-hold the suction: cup in place, or if it is so desired and'is preferable after the form H has. been molded and seta threaded opening may be drilled therein into which the stud i6 is threaded for connecting the suction cup to the form H. As-shown in Figure 4 of the drawings,

the perimetrical 'edge portion of the suction cup i l5 projects outwardly from'the' flat squeeze board engaging the face [I of theform il when the tennis not attached to the squeeze board and when the. form. is attached'to the squeeze board by means of the magnet l2 the suction cup is: slightly deformed as shown in Figure 3 of the drawings so that its perimetrical portion is flush with the face H of the form and is in engagement with theilower face of the squeeze board I to provide a suction binding action to hold the form I 1 against accidental displacement during the vibration of the mold-forming machine.

In Figures 2 and 3' of the drawings a single magnet I2 is shown embedded in the body of the form I and this magnet-extends along the longest of the form. Also a single suctioncup l5 isshown in this form of the invention. It is to be understood, however, that various locations of the magnet, various numbers of magnets and various numbers of suction cups. may be employed. to meet the. requirements of holding :the impressione'making .form :firmly inplace on thesquecze board. .In Figures 5.:and

6 of the drawings one such modification of the invention is shown.

In Figures 5 and 6 a plurality of horseshoe magnets are embedded in the form H and they extend crosswise of the form. Each of the magnets 20 has its opened polar ends exposed at the fiat face of the form H which is to engage the squeeze board, the same as the form shown in Figures 2 to 4 inclusive. In the form shown in Figures 5 and 6, a plurality of suction cups 22 are shown which are identical with the suctioncups 1:5 and operate in the same manner.

In Figure '7 of the drawings a magnetic form is shown which is provided for the purpose of making an outlet-riser locating impression in the pouring side of the mold, such impression being shown at 23 in Figure 1 of the drawings. The form 24 is made in the same manner as the form N, that is, it is-preferablymolded from a thermosettingplastic, although if it is so desired the forms H and 2 1 may be molded of any suitable material which will: not deflect magnetic current flow of the magnets embedded in the forms.

The riser locator impression making form 26 has a magnet'ZSembedded therein, the opposed polar ends ofwhicl'rmagnet are flush with the flat squeeze board-engaging surface 26 of the form and are exposed'so that the form 24 may be magnetically attached to the'squeeze board. In Figure 7, the form. 241s shown as not having a suction cup carried thereby, but itis to be understood that if'it is desired or necessary, a suction cup such as the cup 1'5 may be attached tothe form .24 in theisame manner as the suction cup i5 is attached to theform II.

It will be .noted in'Figure 4. of the drawings that a portion of the form H is cut away or rounded out'as shown at 1-8 to receive the perimetrical portion ofthe suction cup 15 when it is deformed during attachment to the squeeze board.

It is to be understood,:of course, that the magnets 12, '20 and have sufiicient magnetic strength to hold the forms firmly against the squeeze boardbutpermit the form to be manually removed forrelocation on the squeeze board.

It will be understood that the invention is not to be limited to the specific construction or arrangement *of parts shown, but that they may be widely modified within the invention defined by the claims.

What is claimed is:

1. In a molding'machine for forming pouring basins, riser locator impressions and the like in molding materials including, a squeeze board having a magnetizable sheet thereon and adapted to be moved towards and away from said molding materials, and a pattern having a seating face and an impression-making exterior face, said pattern. having magnetic means embedded therein with the polar ends thereof flush with and exposed at said seating face to removably mount the pattern atany point on said magnetizable sheet.

2. In a moldingmachine .for forming pouring basins, riser locator impressions and the like in molding materials including, a squeeze board having a magnetizable sheet thereon and adapted to be moved towards and away from said molding materials, and a non-distortionable pattern having a seating face and an impression making exterior face, said pattern having magnetic embedded means therein with the polar ends thereof flush with and exposed 'at said seating face to 5 removably mount the pattern at any point on said magnetizable sheet.

3. In a molding machine for forming pouring basins, riser locator impressions and the like in molding materials including, a squeeze board having a magnetizable sheet thereon and adapted to be moved towards and away from said molding materials, and a pattern having a seating face and an impression-making exterior face,

said pattern having magnetic means embedded 10 therein with the polar ends thereof flush with and exposed at said seating face to removably mount the pattern at any point on said magnetizable sheet, and at least one suction cup carried by said pattern to provide a suction action 15 between the pattern and said magnetiz'able sheet,

5 will deform to provide a firm suction action.

EUGENE C. SUDZIARSKI.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,127,095 Sands Feb. 2, 1915 1,598,559 Cohen Aug. 31, 1926 1,641,880 Cohen Sept. 6, 1927 1,680,502 Craig et a1 Aug. 14, 1928 2,524,737 Sawyer Oct. 3, 1950

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