US251103A - Harrow-tooth - Google Patents

Description

(No Model.)

H. B. FARGO.

HARROW TOOTH.

Patented Dec. 20,1881.

UNITED STATES PATENT OEFIc.

HENRY B. FARGO, OF REDWOOD FALLS, MINNESOTA.

HARROW-TOOTH.-

SPECIFICATION forming part of Letters Patent No. 251,103, dated December 20, 1881,

- Application filed September 28, 1881. (No model.)

To all whom it may concern:

Be it known that I, HENRY B. FARGO, a citizen of the United States, and a resident of Redwood Falls, Redwood county, State ofMinnesota, have invented certain Improvements in Harrow-Teeth, of which the following is a specification.

My invention is an improved barrow-tooth constructed, as fully described hereinafter, so as to secure stiffness, light weight, and a durable point, and specially adapted for use as a smoothing-barrow, with less liability to clog from the accumulation of straw and grass than teeth made in the ordinary manner.

In the drawings, Figure 1 is a perspective view,'showing one of my improved teeth. Fig. 2 is a plan view of part of a barrow-bar, show ing a tooth in section and an open socket. Fig. 3 is a side view, showing part of a bar and a. tooth. Fig. etis a front view of Fig. 3. Fig. 5 is a rear view of Fig. 3; Fig. 6, a cross-section, showing the form of bar from which the tooth is made.

The tooth is made from a bar having five faces, a a. b b d. the faces a a being front-faces, the faces I) b side faces, and the face (1 a back face, as shown in Figs. 2 and 6. The pointis made by cutting from the side faces centrally and downward to the front to form two curved faces, 6 e, which meet centrally, forming an edge, 2', and by their intersection with the front meeting edge, n, of the faces a a making the point 8. The faces b b may be flat, but are best made curved, as shown, reducing the weight without impairing the stili'ness of the bar. The tooth thus made is inserted in asocket, as, in the beam A, which socket corresponds in shape with the cross-section of the tooth, and is so formed that the forward edge, 12, shall be toward the line of draft, and not connected with the central line of the harrow-bar.

Heretofore barrow-teeth have usually been made with sharp rear edges, which construction has proved objectionable from the tendency of the sharp edge to split the barrow-bar when the tooth was forced backward. By forming the tooth with a flat rear face, d, this is prevented.

It has also been common to sharpen harrowteeth bycutting from the back downward and forward on the line g y, Fig. 3; but this forms a very thin, weak terminal point, that soon wears away, leaving ablunt, unserviceable stump. By beveling from both side faces, as described, the sharpening is efiected without so much reducing the width of the tooth at the point from front to rear, thereby securing a wide strong support for the cutting-edge n, and atthe same time forming two wide beveled back faces, 0 e, which, when the barrow is drawn back, serve effectually to level the ground, forming a smoothing-barrow adapted specially for cultivating corn and covering grass-seed.

Heretofore it has been common to form the teeth with the front edges, n, as sharp as practicable, the result being that stalks of grass, straw, 860., met by the tooth are bent sharply across the front edge and retained unless cut. I round the edge a, so that the straw will not bend at a sharp angle, but will be curved and slip readily over the edge. The clogging is thus prevented.

I claim 1. A barrow-tooth having two front faces, a a, side faces, b b, and a flat back face,d,substantially as and for the purpose set forth.

2. A barrow-tooth having the front faces, a a, back face, d, and side faces, I) I), curved inward, for the purpose specified.

3. A barrow-tooth formed as described and having the front edge rounded, as and for the purpose specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

H. B. FARGO.

Witnesses:

CHARLES E. FosrER, A. E. T. HANSMANN.

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