US96819A - Improvement in flasks for moulding - Google Patents

Description

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THOMAS e.' Lucas, or MVIDDL'ETOWN, coNNEoTicUT.

Letters Patent No. 96,819, dated November 16, 1869.

IMPROVEMENT IN FLASKS FOR MOULDNG.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern: y A Be it kno'wn that I, THOMAS G. LUCAS, of Middletown, in the county of Middlesex, and State of Connecticut, haveinvenfted a new and useful Im prove-ment in Foumlry-Moulding; and I do hereby declare that the following is a full, clear, a'nd exact description thereof, which will enable Others skilled in the art -to make and use the same, reference being had to the accompanying drawings, forming part ot' this specification.

`'.lhis invention relates to a new and useful improvement in the manner of moulding patterns for making castings yof iron, or other metal,and consists in the use of a draught-plate, (one or more,) in combination with the pattern, as: hereinafter more fully described.

In the-accompanying drawing- Figure 1 represents a central longitudinal vertical section of the tiask, the pattern on its match-plate and two draught-plates arranged as they are placed in the mould or flask.

Figure 2 is a view of the draught-plate.

Figure 3 is a vertical cross-section of tig. 1, through the line :t fe.

Similar letters of reference indicate corresponding parts.

The object of this invention is to prevent the breaking of the sand at the corners or angles of the mould -in taking cti' the cope of the flask, (from the pattern,)

and in drawing the pattern from the mould.

ThisI accomplish by means of one or more draughtplates, made of metal, or any other suitable material, which plates'are made to accurately tit the pattern.

In this example of my invention, I apply the improvement-to the moulding of a pump-cylinder, the pattern of which is marked A, in the drawing; but the `improvement is applicable to other descriptions of cast-- ings-in fact it is applicable to almost every description of iron, brass, or other metal castings, as the draught-plates maybe made to conform to the shape of almost any pattern, whether presenting a plain level surface at the parting of the pattern or not.

B represents the lower part or nowel of the ask.

C is the cope.

The pattern A is attached to a match or card-plate, d, one-half of the pattern being on each side. The use -of the match-plate is common in moulding.'

`.When the pattern has been ramined`,or properly embedded in the sand, the cope is lifted olf, leaving the pattern and -niatch-platc in their former position.

The match-plate and pattern are then raised from the lower portion of the tlask, the cope is replaced, or the i'lask is closed, and the mould is complete; this, of course, after the core7 has been placed, and the gating ii'om the sp1-ne finished.

. So far as we have described, we have not brought our improvement into use, but in taking the cope off the pattern, and in taking or drawingthe pattern from the noweh7 or lower portion of the flask, a diiiiculty has been experienced which our improvement is designed to remedy, and which it does remedy completely. lhe ditiiculty is, the breaking of the sand `at the anglesaml corners, when such anglesand corners are raised from the pattern, in lifting the cope, and also when the pattern is raised from such angles in being drawn from the noweL There is a certain amount of adhesion oi the sand to the pattern which the most skilful moulder cannot wholly prevent, which adhesion, or the unsteady handling of the cope and pattern, or both combined, oecasions these breaks.

The time occupied by'thc workman in mendin g (with trowel and fslick or with his finger) these breaks, is frequently equal to all the rest of the labor performed in making the mould. The extent of the difficulty is in proportion to the skill of the workman. and is a. very serions one with the most skilful.

As a means of lessenng the evil, the moulder is compelled to use his sand in a very damp state, which in almost every description of moulding injuriously-aftects the casting. By the use of the draught-plates, the sand may be used comparatively dry, while its breaking at the corners is rendered simply impossible.

To accomplish this, we use` one or more draughtplates E, which are (in outline) ofthe forni and size of the flask, but with ends projecting, as seen in fig. 1, so that they, or either of them, may be lifted either with the cope or with the patterns.

The match-plate ll project-s in the same manner, and for the purpose of drawing the pattern. I

The plate E is made to perfectly fit the pattern, as the space or opening F, fig.-2, will tit the centre of the pattern A.

The pattern is made in two halves, separated by the match-plate, as seen in the drawing. Now, to the flat side of each half is added just the thickness of the draught-plate E.

As seen in fig. 1, the parts of the flask are separated by the thickness of all three of the plates, but the flat side of each half of the pattern corresponds in position with the closing surfaces of the fiask, so that when the plates are removed, the parts ofthe tlask will close together with just half the mould of the cylinder in each- \Vith the plates on each part of the pattern, as seen in the drawing, (figs. 1 and 3,) and thc parts of the ilask filled with moulding-sand, rammed around thel pattern, the moulder, in taking oft" his cope, will at the same time raise the upper draught-plate E. This plate as before stated, accurately tits theupper half of the pattern, and as it is raised, it necessarily lifts the sand clean from it, leaving nothing to be done in the way of mending.

The next operation is to draw the pattern with the match-plate d. The lower draught-plate (accurately ltitting the pattern) rests upon the sand in the nowel,

\ V\and remains there while the match-plate and pattern these draught-plates in certain cases, nor is it required to use either in connection with a match or card-plate exclusively.' I do not, therefore, confine myself to any particular method of using the draught-plate, nor forl any particular description of casting, but design it for moulds for castings of every description to which it may be made applicable.

Forthe purpose of furnishing a further illustration of the use of the draught-plate when employed singly, and to show its adaptation to patterns which do not part in the middle, we will introduce the drawing, sheet 2, where the single draught-plate is seen without a match-plate, and' with the pattern in a single piece.

Figure 1 is a longitudinal vertical sect-ion;

Figure 2 is a vert-ical cross-section; and

Figure 3 is a view of the draught-plate attached.

Similar letters of reference indicate corresponding,r parts in both sheets of drawing.

lIn dispensing with the match-plate, for supporting the pattern, as heretofore described, the pattern may be extended at the ends, so that it will rest on the ends ot the flask, there being` recesses or slots in the ask to receive such projections.

These projections may extend through the flask, and serve as handles for drawing.; the pattern, but in mouldingthe pattermeither in one or two parts, withoutl the match-plate, this arrangement is not indispensable.

It will be seen that the thickness of the draughtplate E is added to the centre ofthe pattern, as de scribed above.

In taking off the cope, the plate is lifted with it, raising the sand clean from the pattern. When this is done, the plate is replaced over the pattern, and then the pat-tern is drawn through the plate, while the plate keeps the sand to its place, as before described. The

plate is then lifted from the sand, and the cope is replaced, and the mould is complete, as stated above.

By replacing the draught-plate overthe pattern, after the cope has been removed, all the advantages of two draught-plates are gained, with but a slight addition to the labor,l while the expense is somewhat diniinished.

Having thus described my invention,

I claim as new, and desire to secure by Letters Patent- The mould, composed of the parts B C, and plates E d, constructed and arranged as described.

i' T HOS. G. LUCAS.

W'itnesses J oHN L S. Ronnn'rs, f GHAs. G. R. VINAL.

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