USRE2849E - Improved method of casting screws - Google Patents

Description

V UNITED STATES VPATENT OFFICE.

WILLIAM AL LEN INGALLS, OF CHICAGO, ILLINOIS.

IMPROVED METHOD OF CASTING SCRWS.

specification forming part of Letters Patent No. 54,733 dated May 15, 1866; Reissuc No. 2,849, dated February 4, 1868.

To all 'whom it may concern:

Be it known that I, WILLIAM ALLEN IN- GALLS, of Chicago, in the county of Cook and State of Illinois, have invented a new, useful, and Improved Screw for Stools, Ohairs, Presses, Vices, and other purposes, and my inventiou includes the mode of making the screw as well as the improved screw; and I do (leclare that the following is a full, clear, and exact description of my 'inventiom reference being had to the accompanying drawings, making part of this specification, in which- Figurel represents a view of the seamless screw. Fig. 2 represents a plan or top view of the pattern prepared for making the molds. Fig. 3 is a transverse section of the flask in which the mold is formed with one pattern withdrawn. Fig. 4 is a similar section, having the pattern removed and the molds ready for filling. v

Similar letters of reference in the several figures denote the 'same parts as herein dcscribed. i

The nature and object of my invention consists in producing a new and improved article of cast screws by casting them without seams or scars in a new and improved method or mode, so as to produce screws of a considerable size or even of a large size without seams or scars from the imperfect joining of the parts of thepatterns -and of the flasks or molds, which has heretofore'been found impossible in casting screw of 'any considerable size and length.

By the use of my improved method screws of almost any size and adapted to almost all purposes for which such screws are used can be cheaply and expeditiously made, as all filing and fitting is rendered unnecessary.

To enable others skilled iu the art to make 'and use my invention, I will now proceed to describe the same.

The mode of preparing the mold for casting thescrew A with its head B, which is for a piano-stool in the form shown, is as follows: The patterns D for the head B are secured to a plank or other suitable support, O, into which if of Wood, a -metallic block, N, .is inserted,

which, with the pattern D, when properly prepared, form a guide, through which the patterns of the screw are turned out of the mold. Through the pattern D and the metallic block N, arranged as shown in Fig.3,or in any-other suitable manner, is cut a female screw, whose diameter and threads correspond exactly with the diametcr of and threads upon the screwpatterns E. These patterns are then screwed in through said female screw, as shown at E' iu Fig. 3. When the patterns are thus ar-' ranged the box F is placed upon said plank O and packed or tamped with any suitable molding-sand around and upon said patterns, so as to leave distinct andaccnrate im pressions thereof in the sand when the patterns are removed. f

After the sand has been properly paeked, as aforesaid, the patterns are turned or screwed out from the sand, as shown at Ez in Fig. 3, and the patterns being turned or screwed out to or through the guide-nut l'ormed by the block N and pattern D, the operator is enabled to withdraw the patterns D from the mold without destroying or injuring the threads of the molds.

The screw A, hereinbefore described and represented at Fig. 1, is provided with a head, B, cast with four lugs or arms, whereby the screw may be attached to a seat for stools or other purposes; but screws may be cast in this manner, whether provided with such a head or not or without any head, and the threads may be formed with square Shoulders or with any desired angle or curve.

The screw -patterns may be of iron or any other suitable material, and may be turned out of the mold by inserting a pin in the hole 'shown near the collar or by a wrench or in any other suitable manuer.

When the patterns are withdrawn, as shown at E'z in Fig. 3, the plank O with the patterns are removed, and the molds Mare then backed by a surface of molding-sand contained in a box, G, which is hooked to the box F, as shown in Fig. 4, or otherwise suitably secured.

In Figs. 3 and 4the molds are turned down upon one side to allow the patterns to be re'- movell and the molils to he fillell, which is effeeted by ponring the metal int-o a. hole, ll, which has gates leading into the mollls M near 01' at the hottmn thereo', to prevent washing while the metal is being ponrell.

Having thus fully (leseribed my im'ention, what I elaim as new, and (lesii'e to secure by Letters Patent, is-

1. The mode herein (leseribetl for casting sezunless serews. i

2. The serew herein deseribed, as a new and improved article of mannfaetnre.

"ll ALLE INGALLS.

. In presence of- E. A. XVEST, J. H. WHIPPLF..

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