US23176A - Improvement in molding female screws - Google Patents

Description

PLFETERS, PHOTO-LITMDGRAPHER. WASHINGTON C E. L. LAMB AND SAM. VOOD, OF KEOKUK, IOWVA.

IMPROVEMENT IN MOLDING FEMALE SCREWS.

Specification forming part of Letters Patent No. 23, l h`76, dated March 8, 1859.

To all whom, it may concer/2,:

Be it known that we, EDWARD L. LAMB and SAMUEL WooD, of Keokuk, -in the county of Y Lee and State of Iowa, have invented certain new and useful Improvements in Molding Female Screws; and we do hereby declare that the following is a full, clear, and exact description of the same, reference `being had to the accompanying drawings, of which- Figure l is a perspeetiveview of amoldingflask with the improvement iu place; Fig. 2, a plan of one-half of the match-plate, (full size;) Fig 3, a section of the same at its line of division, (full size;) Fig. 4, section of iiask with match-plates in place; Fig. 5, section of mold with match-plate removed and ready for reception of the metal; Fig.6, plan of flask, cope side up; Fig. 7, plan of flask inverted, or drag side up, Fig. S, plan of matchplate, cope side up; Fig. 9, plan of matchplate inverted, or drag side up.

In the manufacture of east-iron axles or axlearms with screws and nuts on'their ends to hold on thc wheels it is an important object to save the expense of cutting screws by machinery. Inasmuch as both right and left handed screws are required for this purpose, it involves a heavy outlay in complicated machinery to pursue the manufacture.

Methods have been contrived by which the male screws on the axle-arms have been molded and east complete; but we are not aware of any plan having been hitherto practiced by which the female screw hasI been molded in sand with sufiicient facility and exactness to obviate the liability of tearing away the sand from the sharp edges of the thread on withdrawing the pattern, which would render the casting useless.

rBhe object of our invention is to provide a means of molding a nut with its female screwthread complete, so that the nut when cast requires no subsequent nishing operation, and to perform the operation of molding with such facility and rapidity as to materially reduce the cost of manufacture.

`Our improvement consists in the use of a plate, a c', adapted to a molding-ask such as is commonly used for similar purposes, which has formed on and in one piece with it the pattern of the exterior of the nut b. A female screw,c,is formed within it, the exact counterpart of the screw required to be cast in the nut. The plate is divided vertically along the center line, d, and has dowels e e, to cause the two halves c c to match exactly when closed together. It also has parallel grooves f j', which rest on the ridges or guides g g, affixed to the opposite sides of the drag orlower part of the fiask i, and which serve to guide the two halves of the match-plate a a in placing them on the fiask, and while withdrawing them laterally from the mold, insuring their meeting exactly, and laying flat and parallel when in place. A/cap-plate, k, forms the upper part of the pattern, fitting onto the matched plate by dowels in the corners.

The uses of the several parts will be best understood by describing the process of molding a nut. rlhe entire fiask, with the matchplate, cap, &c., in place, as shown in Fig. l, is set on the molding-floor, the gate U print l set up, and the cope or upper part of the flask 7L lled with sand, rammed, and leveled. A board is then placed on it, and the wholeis inverted, with the lower or drag side, i, up.

`The drag is then filled and rammed in like manner, a better quality of sand being used to fill the core or female screw c, and particular care being taken to insure the screw-thread being entirely and perfectly filled. The wholev is then restored to its first position, with its cope side up. The cope, with its contained sand, is then lifted off, leaving the match-plate a a resting on the lower part of the flask. The cap-plate It is then removed, and the two halves of the match-plate a a are withdrawn by sliding them laterally in opposite directions on the ridges g g, thus removing them from the core, and leaving its thread perfect and uninj ured. The cope is then replaced on the drag, the upper and lower surfaces of the sand, before separated by. the thickness of the match-plate, now coming together and making a perfect junction. The top of the core cnow reaches the top of the impression made by the cap K, which is made of the exact thickness of the match-plate a, in order to occupy the space above the core, which would otherwise be too long when the two halves of the mold are closed together. Y

The ask shown in the drawings is provided with hinges m in one ofits corners, and--is held together by spring-catches n at the oppoflask can be opened and removed, leaving the y other nuts of the same kind.

site corners. By releasing the Catches n, the

sand mold ready for the reception of the melted metal, while the askvis used for molding It is obvious that many other articles having internal recesses, the cores of which cannot be removed vertically, may be molded by similar means, and it is contemplated to apply the invention to other articles, which it is unnecessary to enumerate. f

The separate cap-plate k may be dispensed t with in some cases, though we prefer to use it, as shown, when the eore is to reach through 1 the article, as in the nut described. l

We do not intend to claim the practice of molding the corresponding parts of a pattern, which are arranged upon the opposite surfaces of a plate interposed between the joining parts of a two-fold iiask, nor molding the two halves of the pattern upon separate plates, adapted,

respectively, to the upper and lowerhalves of the mold; but

Vhat we claim, and desire to secure by Letters Patent, is-

The match-plate a c', having both the eXterior and interior of the pattern formed on it, when the same is divided vertically on a center line, and adapted to a suitable flask, and resting on guides on which the two halves of the plate can be Withdrawn laterally in opposite directions from the eore, substantially as described, for the purpose of molding female i screws, or other articles which do not admit of having the pattern removed vertically from the core.

EDWARD L. LAMB. sAMUEL woon.

\Vitnesses:

JACOB BUsHEY, J. D. ELLIs.

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