US770868A - Harrow-tooth fastening. - Google Patents

Description

No. 770,868. PATENTED SEPT. 27, 1904.

J. PORTEOUS.

HARROW TOOTH FASTENING.

APPLICATION FILED MAY 4, 1904 N0 MODEL wlmesses Xmkmior- I d M J2 7M1: WWW 7 vhf UNITED STATES Patented September 27, 1904.

PATENT OFFICE.

JAMES PORTEOUS, OF FRESNO, CALIFORNIA.

HARROW-TOOTH FASTENING SPECIFICATION forming part of Letters Patent No. 770,868, dated September 27, 1904.

Application filed. May 4, 1904. Serial No. 206,315. (No modelJ To all whom it may concern.-

Be it known that I, J AMES PORTEOUS, a citizen of the United States, residing at Fresno, Fresno county, State of California, have invented certain new and useful Improvements in Harrow-Tooth Fastenings; and I do hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to that class of fastenings for harrow-teeth in which the tooth is driven down through and held in a tubular frame.

A frame made of pipe possesses certain advantages of strength and lightness which render it desirable in this class of implements. Experience has shown that the simplest method of fastening the tooth in a tubular bar is to drive the tooth tightly diametrically through the bar; but there is a serious drawback both to the use of a tubular bar and-to this method of fastening the tooth in .it namely, the excessive frictional wear upon the bottom of the bar resulting in the destruction of its integrity and its consequent power to hold the tooth, for it is obvious that when the wall of the bar wears through the support for the tooth is destroyed.

The object of my invention is to remedy this difficulty bya construction of parts which will enable me to use for the frame of the harrow a tubularbar or pipe and-to drive the tooth through it and yet compensate for the wear underneath in such a manner as to preserve the integrity of the bar itself, and consequently its holding power.

To this end my invention consists in the novel construction and arrangement of parts, which I shall now fully describe by reference to the accompanying drawings, in which- Figure l is a cross-section through the frame-bar, showing the holding-clip in crosssection and the tooth in elevation, the clip having its ends straight, as when first applied prior to bending them to final place. Fig. 2 is a similar view showing the clip finally seated with its ends bent to place. Fig. 8 is a top view of Fig. 2. Fig. 4 is a side view of the same. Fig. 5 is a cross-section showing the application of a double clip oppositely adjusted.

1 is the tubular bar or pipe of the harrowframe.

2 is a clip initially made of a recumbent U shape. It is fitted at first to the bar 1, as shown in Fig. 1, with its ends 2 extending straight.

3 is the tooth. It is driven down through the clip 2 and through the partially-encircled tubular bar 1. In practice the opposing holes in the clip are made slightly nearer together than the opposing holes in the bar, so that when the tooth is driven through it forces the four holes to aline, thereby tightening the clip to the bar. After the tooth is driven in the ends 2"of the clip are bent down upon and concentric to the bar, as shown in Fig. 2, which represents the final fastening position of the parts. This bending down of the clip ends is advantageous in the further particular of avoiding projecting pieces liable to catch and gather debris. In its bent shape it presents practically as smooth a surface as the bar itself. It will now be observed that as the clip passes under the bar it will receive the frictional wear and so save the bar itself. When the clip is worn through, or nearly so, the tooth is driven out, the clip removed, a new one put on, and the tooth. replaced. Thus the integrity of the bar is preserved and its holding power maintained indefinitely simply by renewing the clips when necessary.

In Fig. 5 I show the use of a second clip 4:, which is best applied from the opposite side to that of the clip2. The second clip overlaps the first, and the two together, in addition to providinga stronger grip on the tooth, present a thicker wearing surface underneath.

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

1. In a harrow, the combination of the tubular frame-bar having diametrically opposite holes,the substantially U-shaped clip fitted to said bar, with its arms passing above and under said bar, said arms having holes alined with the holes in the bar, and the tooth driven down through said alined holes in clip and bar.

2. In a harrow, the combination of the tubular frame-bar having diametrically opposite holes,the substantially U-shaped clip fitted to said bar, with its arms passing above and under said bar, the ends of the arms being bent down upon and concentric with the bar, said arms having holes alined with the holes in the bar. and the tooth driven down through said alined holes in clip and bar.

3. In a harrow, the combination of the tubular frame-bar having diametrically opposite holes,the substantially U-shaped clip fitted to said bar with its arms passing above and under said bar, the ends of the arms being bent down upon and concentric with the bar,

said arms having holes alined with the holes 5 in the bar, the second clip partially encircling the bar and the first clip from the side opposite to the latter, said second clip having holes in its arms alined with the holes in the first clip and in the bar, and the tooth driven down through 20 the alined holes in'the clips and bar.

In witness whereof I have hereunto set my hand.

JAMES PORTEOUS.

Witnesses:

M. K. HARRIS, L. B. HAYHURST.

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