US1077455A - Harrow. - Google Patents

Description

H. G. COPENHAGEN.

HARROW.

APPLICATION FILED AUG. 10, 1912.

Patented Nov. 4, 1913.

HEElvIAN C. COPENHAGEN, OF AUBURN, WASHINGTON.

Specification of Letters Patent.

HARBOl/V.

Patented Nov. 1, 1913.

Application filed August 10, 1912. Serial No. 714,461.

] all whom it may concern Be it known that I, HERMAN C. COPEN- I-IAGEN, a citizen of the United States, residing at Auburn, in the county of King and State of Washington, have invented certain new and useful Improvements in Harrows, of which the following is a specification.

This invention relates to improvements in harrows.

The object of my improvements is first, the provision of devices whereby the inclination of the harrow teeth may be conveniently regulated so that the harrow can be used selectively for p'ulverizing or cultivating purposes; and second; the provision of means whereby the various tooth carrying bars are rendered rotatable in order that the teeth will yield to any obstacles encountered in the ground being worked or for automatically freeing the teeth of accumulations of roots or other trash which may be collected in the progress of the harrow.

The invention consists in the novel construction and combination of parts as will be hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a perspective view of a harrow embodying my invention. Fig. 2 is a longitudinal vertical section of the same. Fig. 3 is a detail sectional view taken through one of the tooth bars.

The reference numerals 5 designate the longitudinal rails of a harrow frame which are provided at the forward ends with hooks 6 for connection with the draft appliances. Intermediate said rails is a third rail 5. These rails are provided with a series of spaced openings 7 which serve as journal bearings for transversely arranged bars 8 which, as shown in Fig. 3, are desirably of a substantially U-shape in cross section. Harrow teeth 9 are detachably secured to said bars as, for example, by nutted U-bolts 10. Provided at the adjacent ends of the several tooth bars are crank arms 11, the crank pins 11 of which are journaled in a coupling rod 12. Secured to said bars are pairs of spurs 13 and 18 which are arranged at angles of approximately 120 with respect to each other and to the axes of the several harrow teeth oi the respective bars 8. As illustrated, each pair of said spurs is desirably formed integral with a shank 13 and the latter are secured to the bars as by bolts 14. Fixedly mounted upon one of said bars is a wheel 15 having in its periphery a ratchet tooth 15?. A lever pawl 16 is tulcrumed intermediate its length to a hand lever 17 which, in turn, is fulcrumed by a pin 18 to the rail 5 in proximity to the wheel 15. p c

A plate 19 is rigidly secured to the rail 5 andhas its upper serrated edge disposed concentrically to the axis of the pin 18. Pivotally connected to the hand lever 17 is a pawl 20 whichis adapted for engagement in a selected one of the serrations of plate 19. A rod 22 operatively connects pawls 20 with a bellcrank lever 23 which is carried by said hand lever and is utilized in disengaging the pawl from said plate and in opposition to a spring 241 when the hand lever is to be manipulated to advance or recede the pawl 16 for the purpose of eftecting a partial rotation to the Wheel 15. By such devices and through the cooperation of the crank arms 11 and the coupling rod 12 the bars 8 are influenced to present the harrow teeth 9 in vertical positions and at various inclinations therefrom. 25 is a helical spring connected to one arm of the lever pawl 16 and tends to hold the pawl in contact with the periphery of Wheel 15. Connected to the other arm of the lever pawl is a chain or line 26 which passes over a guide pulley 27 upon the hand lever and thence trails upon the ground behind the harrow.

In operation, when brush, roots or trash is gathered upon the harrow teeth, or where the latter are about to encounter a large rock or other obstacle, the operator pushes down upon the trailing end of line 26. l i hereupon, the continued travel of the harrow puts a strain upon the line to cause the pawl 16 to be disengaged from the wheel tooth 15. he bars are thus rendered free to be rotated by onward movement of the harrow which causes the teeth 9 to be swung rearwardly and similarly act upon the spurs 13 and 13 as they are successively brought into positions to penetrate the ground; and whereby the revolutions of the teeth are accomplished until interrupted by the tooth 15 of the wheel engaging pawl 16 when the teeth are restored to operative positions as determined by the positioning of the same through the medium of the hand lever 17, as above explained.

l/Vhat I claim, is

1. In a harrow, the combination of the frame, tooth bars, rotatably mounted in the frame, a lever pawl, a stop on one of the bars and engngeahle by said pawl, and an adjustable support for said pawl.

2. In :1 borrow, the combination with the frame, bars rotatably connected to the frame, teeth secured to said hers, means carried by the bars and cooperating with said teeth for revolving" the latter by engaging in the ground in the progressive travel of the herroW, of e-Wheel fixedly mounted upon one of said here and provided with a ratchet tooth, at toothed segment mounted on the frmne, a manually controlled lever pivoted to said frame, a pawl carried by said lever and engaging said segment, 2L lever pawl carried by the n'mmmlly-controlled lever engaging" said toothed Wheel, the manuallycontrolled lever being shiftable to control the angularity of the barrow teeth.

Signed at Seattle; Washington, this 19th day of July 1912.

HERMAN C. COPENHAGEN. Witnesses HORACE BARNES, J. V. NooDWARD'.

Copies of this patent may be obtained for five cents each, fiyfa'ddressing the Commissioner of Patents.

I Washington, 1). c.

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