US703807A - Plow-point. - Google Patents

Description

No. 703,807. Patented July I, I902.

' s. c.mvsns.

PLOW POINT.

(Application filed Apr. 24, 1902.)

(No Model.)

UNrrn rates Prion.

" ren't PLOW-POINT.

\ SPECIFICATION forming part of Letters Patent N 0. 703,807, dated July 1, 1902.

Application filed April 24, 1902.

To all whom, it may concern:

Beit known that-I, SAMUEL O. lVIYERS, a citizen of the United States, residing at Mifflintown, in the county of Juniata and State of 5 Pennsylvania, have invented certain new and useful Improvements in Plow-Points; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

My invention consists of a plow-point of novel construction, as hereinafter fully set forth.

The purpose of myinvention is to increase the life of plowshares by providing them with points that may be easily and. quickly renewed or made sharp again after having been worn down to a blunt point by constant use.

In the accompanying drawings, Figurel is a perspective view of a plowshare constructed in accordance with my invention. Fig. 2 is a similar view of the same share after the original point (shown in dotted lines) has been worn dull and been repointed. Fig. 3 is an elevation of the point of the share as seen from the land side of a plow. The heavy dotted line represents the outline of the point after having been subject to considerable wear. The light dotted line represents the outline of the uppersurface of the point after the plate has been removed. Fig. 4: is a vertical sectional view through the point of the share on the line 4 4: of Fig. 6. Fig. 5 is a similar view after the original point, which is outlined in dotted lines, has been worn down to a dull bluntpoiut. Fig. 6 is a horizontal sectional view through the point on the line 6 6 of Fig. 4. Fig. 7 is a transverse section on the line 7 7 of Fig. 6, and Fig. 8 is a detail perspective View of the core and support for the same.

The nose or point of a plowshare Wears away much more rapidly than the balance of the share, and as a consequence the entire share must be thrown away after the point. becomes dull. To overcome this expensive practice, various means have been tried, the most satisfactory prior to my invention being to provide the share with a detachable point which may be removed and replaced when dull. This method is not entirely satisfactory, as it is not always possible to attach the points securely enough to prevent them from becoming loose, and then the share with a separate point has not the strength of one with the point cast integrally.

My invention aims to cure the above-indicated objections; and to this end it consists in casting integrally with the point of the share a plate which forms the upper surface of the point and which may be broken off when the extreme point has become blunt to leave a point on the share that is much sharper than the worn -down point was. This plate is really nothing more than a portion of the upper part of the point separated from the lower or main portion of the share-point. The thickness of the plate will be much greater at the end adjacent to the point'of the nose than at the opposite end in order that the new share-point formed by the removal of this plate will be sharp. This will be better understood upon referring to the drawings, in which A indicates a 'plowshare, B its original point, and O therenewed point. To all appearances my improved share looks like an ordinary share with the nose or point cast integrally, and it is made or cast in theusual manner. In order to form the plateor portion that is to be broken away, I support in the matrix or east-space of the mold in which the share is to be cast a core or separator D,

preferably of asbestos or some infusible material. This core D almost entirely separates the upper portion of the point or that part which I term the removable plate from the lower portion of the'point of the share.

On reference to Fig. 6 it will be noted that as shown'at a; but in orderto give additional strength to the point I may provide the core D with slots or apertures d, through which the molten metal flows and forms supports or braces b for the plate.

The core may be supported and heldin the proper position during the casting in any desired manner. I have shown in the drawings a wire support E. This support, as clearly seen in Fig. 8, is made of one piece of'wire bent, as shown, so that the ends 6 rest on the bottom of the cast-space of the mold, and the bent portions 6 bear against the top of the away to leave the new point.

cast-space of the mold. It will be seen that bythis arrangement the core may be readily adjusted to the proper angle.

Of course I do not limit myself to the exact location of the core in the point or to the angle which it bears with respect to the bottom of the share-point. The location of the core in the point will depend partly upon the nature of the iron used and also upon the taper which it is desired that the renewed point should have. 1

I preferably locate the core, as shown in Fig. 4 of the drawings, so that when the point has worn down by use, as shown in Fig. 5, a cold-chisel may be readily inserted in the space formed by the core and the plate or upper surface of the point chipped or broken I would further have it understood that I do not limit myself to the number of cores inserted in the point. If desired, I may insert two or more, and thus be able to renew or repoint the share two or more times.

As explained before, the operation of casting my improved share is the same as formerly, the only difference being the insertion of the core in the cast-space of the mold before the molten metal is poured in. The fact that the core is exceedingly thin, of less width than the point, and perforated to allow the metal to run through and unite to form supports for the plate makes the liability of weakening the point very slight.

After the point has been worn down until it appears as in Fig. 5 all that is necessary to obtain a new sharp point is to take a coldchisel and chip ofi the plate, the supports a and Z), and make the top surface of the point smooth. It has been found that the upper surface of the new point will be slightly chilled during the casting of the share, owing to the fact that the core is cold and does not become heated readily.

Thus it will be seen that a plowshare constructed in accordance with my invention costs but slightly more than the old share and is practically equivalent to two of the old ones.

It is obvious that various changes may be made in the form, proportion, and manner of separating the removableplate from the lower part of the point, and so I do not limit myself to the manner and construction shown in the drawings.

Having thus described my invention, what I claim, and desire to secure by Letters Patcut, is

1. A plowshare having cast integral therewith a plate which throughout a portion of its surface is separated from the body of the plowshare and which may be removed when the nose or point has become dull, in order to leave a new sharp nose or point, substantially as set forth.

2. A cast-metal plow-point having an integral plate cast lengthwise of the point, forming one surface of the same and capable of being removed to leave a new sharp point, substantially as set forth.

3. As a new article of manufacture, a plowshare having a cast-metal point integral therewith, and a plate cast integral with the point and capable of being removed, substantially as set forth.

4. A plowshare cast hollow at a point in the rear of its original point or nose whereby when the said original point or nose wears back to the hollow portion, the upper wall thereof may be removed to present a new point or nose, substantially as set forth.

Intestimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

SAMUEL C. MYERS.

WVit'nesses:

J. W. KIRK, BOYD S. BERGEY.

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