US303274A - Leyi francisco - Google Patents

Description

(No Model.)

L. FRANCISCO.

ADJUSTABLE HARROW. No. 303,274. Patented Aug. 12, 1884.

ITED STATES LEVI FRANCISCO, OF OAKLAND, \VlSL-ONSIN.

ADJUSTABLE HARROW.

SPECIFICATION forming part of Letters Patent No. 303,274, dated August 12, 1884-.

Application filed May 1, 1883. (X0 model.)

To all whom it may concern.-

Be it known that I, LEVI Fnilnoisoo, a citizen of the United States, residing at Oakland, in the county of Jefferson and State of VVisconsin, have invented certain new and useful Improvements in Adjustable Harrows; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in flexible barrows, and pertains to that class in which the teeth are adapted to be adjusted at various angles of the draw-bars, as may be desired.

My improvement consists in the device by which the cross-bars through which the teeth are inserted are secured to the draw-bars and retained at the several points of adj ustment at which it may be desired to secure the teeth.

My invention is further explained by ref-' ercnce to the drawings, in which Figure 1 represents a side view. Fig. 2 is a top View of one of the sections of the barrow, two or more similar sections being arranged alongside of each other. Fig. 3 is a detail view.

Like parts are represented by the same ref ercncc-letters throughout the several views.

A represents the crossbars, which are preferably made cylindrical in shape. B represents the teeth. 0 and D are the draw-bars by which the several cross-bars A are connected together. The forward end of the upper bar, 0, is longer than the rear end, and is provided with a hook, E, which is adapted to engage in the next succeeding lower bar, D, which is provided with a hook, F. The bars 0 and D are curved conversely to each other, as shown in Fig. 1, whereby they are adapted to fit the rounded bar A. The bars C and D are secured together around the bar A by bolts G and H. The annular space between the bars 0 and D, when said bars are bolted together, is slightly less than the circumference of the cross-bars A, so that when said cross-bar is secured between said drawbars there is a small space left between said drawbars, which permits said draw-bars to be drawn toward each other around said cross-bars without coming in contact, whereby said rounded bars A are prevented from turning in their bearings in the draw-bars, and whereby ample space is allowed for shrinkage of said rounded bars, and provis ion made for drawing said drawbars together around them when shrunken. The bars C and D may be made of ordinary fiat bar-iron, which is readily forged into the shape shown, and secured together with ordinary bolts around the cross-bars. The teeth may be inclined forward, rearward, or adjusted at any intermediate angle desired.

When desirous to change the angle of adjustment of thet-eeth, one or both of the bolts G and H may be slackencd, when the rounded bars are readily turned in their bearings until the teeth are brought to their desired angle of adjustment. This done, the bolts G and Hare again tightened, when the rounded bars are rigidly secured and the teeth rctained at the desired angle of adjustment.

To increase the friction of the draw-bars upon the cross-bars, one or more small burrs, a and I), are formed by indenting the sa d draw-bars (l and D, whereby a small burr is caused to project from the inner annular surface of the draw-bars, which engages in the surface of the rounded bars A and prevents them from turning in their bearings.

I am aware that the toothed bars of a harrow have heretofore been connected together bydraw-bars fitted to their upper surfaces, against which they are held by U-shaped clips beneath their lower surfaces, as shown in Patent No. 162,306, and in Patent \o. 166,7 63, and I make no claim to the devices as shown and combined iuthose patents; but I believe myself to be the first to produce a flexible barrow with adjustable toothed bars, having the bars clasped and held by converse ly-bent draw-bars, niade rigid and held together by simple and chcaply'made bolts and nuts, as described.

Having thus described my invention, what I claim as new, and desire to secure by Letters an eye, adapted thereby to attach the several 10 Patent, isseetions'of the ham-ow together flexibly, sub- In an adjustable toothed harrow, the oomstantially as and for the purpose specified.

bination, with the respective toothed bars A, In testimony whereof Iaffix mysignature in 5 of upward-curved draw-bar O, downward" presence of two witnesses.

curved draw-bar D, and binding-bolts G and LEVI FRANCISCO. H, said downward and upward curved draw- \Vitnesses:

bars being provided at their respective free JAS. B. ERWIN,

ends the one with a hook and the other with D. F. VVADsWoRTIL

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