US404144A - Pattern-board - Google Patents

Description

(No Model.)

J. WRIGHT.

PATTERN BOARD.

4 No. 404.144. I

Patented May 28, 1889.

UNITED STATES PATENT OFFICE.

JOHN IVRIGHT, OF CLEVELAND, OHIO.

PATTERN-BOARD.

SPECIFICATION forming part of Letters Patent No. 404,144, dated May 28, 1889.

Application filed March 13, 1889.

To all whom it may concern.-

Be it known that I, JOHN WRIGHT, a citizen of the United States, residing at Oleveland,in the county of Ouyahoga and State of Ohio, have invented certain new and usef ul I mprovements in Pattern-Boards, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in pattern-boards.

The object of the invention is to construct a pattern-board in the use of which the process of molding preparatory to casting is materially simplified, particularly in that class of casting embracing stove covers and centers, and it is to that class that this invention more especially appertains.

In the use of the board hereinafter describec I am enabled to gate the patterns from a central connecting-gate, doing away with the employment of peripheral or skin gates, which latter leave the castings in such condition as to require grinding before they are ready for market or fit for use.

By my process, after the gates have been broken from the castings, such castings are left smooth and clean and require no grinding whatever, and are ready for use after the adhering sand has been removed. I attain the desired object of this present invention by the employment of a pattern-board upon one ber of face-plates.

side of which is secured any desired number of face-plates-four being the number I use for the sake of easy handling-while upon the reverse side of the board or cope side are secured a number of patterns equal to the num- These patterns I gate by the use of horn-gates radiating from a central gate, which latter carries an anchor-plate and sprue, the toes of the horns resting upon the sinks of the covers. Each face-plate is also provided with a sliding punch for forming the web across the pit.

The invention consists in the peculiar construction and combinations of the various parts, all as more fully hereinafter described and claimed.

Figure 1 is a perspective view of my improved pattern-board with the gates in place. Fig. 2 is a plan of the face-plate side of the board. Fig. 3 is a similar view of the cope side. Fig. 4 is a vertical section on line m 517, Fig. 2.

Serial No. 303,797. (No model.)

Fig. 5 is a vertical central section of the gatepatterns.

In the accompanying drawings, which form a part of this specification, A represents a suitable board, in one face or side of which are secured the face-plates B, each of which is provided with a pit, O. Between the faceplate and the board are placed the punches D,which slide in grooves provided for them in the under faces of the face-plates B, and each punch is provided with a stem, E, which projects through a slot, 0, in the board, and by means of which said punches may be operated.

Upon the cope side of the board are rigidly secured the patterns F, equal in number to the face-plates B. The stems E of the punches D pass through slots 1) in the patterns, and

each stem is provided with a plate, (Z, for coverin g the said slot and to prevent sand from clogging the punches.

In the center of the board A, upon the cope side thereof, is formed a depression, A, to receive the gate-plate II, which is provided with the central connecting-gate, ll. In the lower face of the plate H is formed a depression to receive the anchor-plate J, the latter being locked in place bymeans of a T-headed rod, K, projecting from the small end of the sprue L, said rod K passing through an axial ,openin g in the connecting-gate and gate-plate and engaging with a rectangular slot in the anchor-plate. I11 the gate-plate is formed a series of openings to receive the heels of the horn-gates, which latter rest upon the anchorplate, as is clearly shown in the drawings.

I style the plate J an anchor-plate, for the reason that it, in connection with the T- headed bolt K, secures together in their relative positions the sprue L and central gate, H, while it also forms an anchor for the heels of thehorn-gates. The central opening through this anchor-plate is rectangular in form, so that when the head of the bolt is inserted through it and is given a quarter-turn the arms of the bolt-head will engage with the outer face of the said plate and draw it into close contact with the central gate, H, and within the recess designed to receive it.

In practice I first lay the cope down and place the pattern-board thereon with the faceplates up. I then put on the drag and ram up. Thisbeing done, the flask is'turned over and the gates, anchor-plate, and sprue then put in position, as shown in Fig. 1. I then push out the punches into the cores of the pits already formed, and I .then ram up the cope side. The cope is then taken from the drag, the punches withdrawn, and the sprue, gates, and anchor-plate removed. The flask is then closed together and clamped, and it is ready for pouring. After the cast is made the gates are knocked oif and the sand removed from the castings in the usual manner, and the covers are ready for shipment or use without the necessity of grinding, as all the contour lines are left perfectly smooth and clean.

Thus it will be seen that I am enabled to dispense with the use of parting-sand, and, having the solid pattern-board to ram upon in forming both cope and drag, I obviate all danger of ramming down the one in forming the other, and I am enabled to mold ten flasks an hour as against five flasks under the old method.

In casting stove-lids by the processes now in use, that are provided with core cavities or pits, the so-called sore point is at the bottom of such pit, and it is at that point that the castings are disposed to shrink or blow.

I am 'also enabled to pour the-flask from one I sprue-opening.

What I claim as my invention is' 1. Apattern or match board provided with a series of two or more face-plates and patterns in pairs, substantially as herein described, in combination with horn-gates radiating from a central gate and communicating with a central sprue, substantially in the manner and for the purposes specified.

2. In combination, apattern-board provided with face-plates and patterns, a series of horngates gating to and with a central connectinggate, an anchor-plate, and a lockingsprne, the parts being constructed, arranged, and operating substantially in the manner and for the purpose described.

In testimony whereof I affiX my signature, in presence of two witnesses, this 26th day of December, 1888.

JOHN WRIGHT.

itnesses:

H. S. SPRAGUE, F. N. CARTER.

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