US28260A - Improvement in molding - Google Patents

Description

NITED STATES PATENT OrmesG JOHN DOUGHER-TY, OF COLD SPRING, NEW YORK.

IMPROVEMENT IN MOLDING.

Specification forming part of Letters Patent No. 28.260, dated May 15, 1860.

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Be it known that I, J onN DOUGHERTY, of Gold Spring, iny the county of Putnam and State of New York, have invented a new and Improved Machine for Operating Templets in Loano-Molding; and l do hereby declare that the following is a full, clear. and exact description thereof, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure l represents a side elevation of the machine.

Similar letters of reference indicate correspending parts in both figures.

This invention is an improvement in managing the templets that are used in loam-molding for casting large work-such, for instance, as steam-cylinders, large pipes, ily-wheels, and such molds that cannot be conyteniently and accurately made in the ordinary method of molding.

The method of molding such work in loam is at present attended with many difficulties familiar to those skilled in the art, which itis the special object of my invention to remedy.

For such work as steam-cylinders or wheels of large diameter the present mode of casting them, as is well known, is by building up a mold of brick-work coated or plastered with soft loam, which is scraped for cylinders into the cylindrical form by a radius-board moved round on its axis. When the surface is thoroughly dry, it is brushed over with blackwash and again dried. A templetis now used,cut exactl y to the external form of the cylinder, which is attached to the axis at the distance from the core required for the thickness of the metal. Some additional loam is thrown in to form the thickness, which is smoothed in the same careful manner as the center, after which the templet and its spindle are dismounted. The base-ring for the outer case or cope is now laid down, and this outer case is built up of bricks and loam,with an inner facing of loam worked very accurately` to the turned thickness. The new work or the cope is also thor oughly dried, and afterward lifted off very carefully by means of the crane and a crossbeam with fourA chains. The mold is now put together in a pit sunk in the floor of the foundry, and the casting is performed in any of the well-known ways.

Fig. 2 is a plan view of the same.

My invention consists 4in a novel arrangement of gearing, combined with the central spindle carrying the templet, for giving to said templet or tcmplets of any description, according to the kind of work, a vertical reciprocating motion or a vertical motion combined with a circular motion, as will be hereinafter described and represented.

To enable others skilled in the art to fully understand my invention, l will proceed to describe its construction and operation.

In the drawings, A represents the truck or base of the machine, upon which is erected a hollow shaft or spindle, B. having its lower bearing in a step-block, B', on the truck A, and its upper bearing in a bracket-block, C, that projects from a horizontal frame, D, placed at a suitable height above the floor of the foundry. This hollow shaftcarries on its upper end a groovedv spur-wheel, E, that is acted upon by a worm-wheel,hereinafter de scribed, for giving to it a circular motion.

G is a hollow screw-shaft that passes up centrally throughthe hollow shaft B and through the spur-wheel E, and carries a -small bevel gear-wheel, F, on the upper end. This bevel spur-wheel F is actuated by either one or the other of the twin bevel spur-wheels H H', which give to the screw-shaft a right or a left rotary motion as one or the other is brought into gear with t-he wheel E. The wheels H H' are on a horizontal shaft, J, and secured to this shaft by a key-tenen, a, so that they may have a longitudinal play, and thus be brought alternately into gear with the spur wheel E. The shaft J may be driven by hand or other convenient power.

On the end of shaft .Tis keyed a large spur wheel, K, which gives motion to a similar spur-wheel, K', that has its bearings in the end of a swinging iron, b, hung from the endv of shaft J. The pivot-bearing of wheel K' is guided and steadied by a slotted guideplate, c, that is secured to the end of frame D. This wheel K' is intended to transmit motion to the endless screw or worm-wheel shaft L by acting upon a pinion-spur, L.

y On the hollow shaft or spindle B is placed templet-bloek, M, which is a circular flanged wheel with perforations drilled through the anges, that receive bolts for securing the radius-bar of a templet to it. This block M is taken down in order to remove the molds, the

manner of doing which Will be understood by any mechanic.

'New from this description it will be understood that by attaching a templet to the block M, of any suitable radius, it may be operated with a reciprocating motion up and down the shaft B by alternately engaging the twin wheels of shaft J with the bevel-wheel E of the screw-shaft G, or both a reciprocating and circular motion may be given to the templet-block by bringing into gear With the -wheel the Worm-Wheel on shaft L, and with this latter motion spiral castings may be made.

By combining with this machine a earriage, that will have a horizontal movement upon which the inold is built, oval or elli`ptical molds may be made.

The manner of constructing the molds' in loam is precisely the same as that of the present mode; but the facility of operating the teniplets that are secured in the block M is the distinguishing characteristic of my inveir tion and improvement.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

rPhe templet-bloek M, combined with a hollow shaft, B, and screw-shaft G, and operated substantially in the manner and for the purposes herein set forth.

JOHN DOUGHERTY.

Vitnesses:

A. H. LADUE, SAMUEL XV. CoUoH.

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