US522435A - Spring-tooth harrow - Google Patents

Description

W.,E. SMITH. SPRING TOOTH HARROW.

(No Model.)

Patente-d July 3, 1894.

@uhm/zoom n UNITED` STATES PATENT OFFICE.

lWILLIAM E. SMITH, OF `WATKINS, NEW YORK.

SPRING-TOOTH 'HARROW.

sPEcIFicATIoN forming part of Letters Patent No. 522,435, aateaJuly s, 1894. Application tiled September 22, 1892*. Renewed January 18, 1894. SerialNo. 49'7,332. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM E. SMITH, a citizen of the United States, residing at Watkins, Schuyler county, vNew York, have invented certain new and useful'lmprovements in Spring-Tooth Harrows, ot' which the following is a specification.

My invention relates to spring tooth harrows, and it has for its object to provide means whereby the spring teeth may be adj ustably and securely held in position in connection with the frame of the harrow, and to these ends my invention consists in the features of construction, arrangement, and mode yof operation substantially as herein set forth.

Referring to the accompanying drawings, Figure 1, is a perspective view of a harrow embodying my invention. Fig. 2, is an enlarged perspective view of one of the harrow teeth, and means for holding it, the parts being detached. Fig. 3,is an enlarged sectional view through the holder and harrow tooth.

I have shown my invention as applied to one form of harrow 'frame in which the frame is made upy of a series of strips or straps A, bent in zig-zag form, and having flat portions a by means'of which they may be secured together, and in the present instance I have shown the stripsjor straps held by the same bolts that secure the tooth holder in position. The frame may be of any size, shape or design, and preferablyis made of two wings or parts hinged together, as at a', while the outer sides are provided withstrengthening strips A. These strips or straps may be made of wrought iron or other suitable material, and can be forged or otherwise bent in the form desired.

The tooth holder proper consists of a hub or yoke B, Awhich may be made of cast metal or otherwise, and which is provided with a cylindrical opening B', and the under side is provided with lugs or ribs b, b' projecting inwardly, and adapted to receive the tooth T, which is shown as being made ot spring metal, preferably having a pointed end T'. The hub also has an opening B2, through the bottom between the ribs b, b' to the cylindrical opening, and the ribs are so arranged that r5c when the tooth is in position, it will extend slightly into the opening B', as clearly shown in Fig. 3. y t,

AArranged to support the holder and the parts of the frame is a connector C, and this connector consists essentially of a hollow tube C', of a diameter considerably smaller than the opening B' in the hub, and of a length suflcient to extend through the yoke. Mounted on, or connected to this tube is a disk D, and this disk is preferably provided with ribs d, on its outer face, the ribs extending parallel across the face and at a distance apart suflicient to receive the frame A. Another disk D', which is preferably separate from the tube, is also provided with ribs d', on its outer face to receive the adjacent portion of the frame, and its inner face is recessed as at d2 to tit over the end of the tube C', and to allow the disk to be clamped against the face of the hub. These parts may be secured together by any suitable means and I ,have shown a bolt E, arranged to pass through the opening e, in the disk D', through the tube C', and the opening e' in the disk D, and through corresponding openings in the parts of the frame A.

It will thus be seenthat when the parts are in the position shown in Fig. 3, and the screw is tightened, the hub B is clamped by the disk, and furthermore, the parts of the frame yA are also clamped and held in position by inder and the ribs of the hub, and I have shown a screw F, passing through an opening in the top of the hub, and bearing on the face of the cylinder C, and forcing the cylinder on to the upper face of the tooth, clamping it securely in position. Not only does this secure the tooth in the hub, but also prevents the hub rotating on the cylinder,'and adds to the friction of the disk in maintaining the hub in its proper position.

It will be seen that with this device if it is desired to adjust a tooth, it is only necessary ICC to loosen the screw F, when the tooth can be slipped in or out of its socket, and again secured by tightening the screw. Further it will be seen that if the positions of the tooth and hub are to be adjusted without changing the position of the tooth in the hub, it is only necessary to loosen the bolt E, when the tooth and hub can be adjusted to any desired angle and again secured.

All the parts of my device can be cheaply and easily made of strong and durable material, and quickly and easily adjusted for any desired purpose, and the harrow can readily be taken apart, or put together, and the Whole forms a simple and eilect-ive device for the purpose specified.

It will be understood that while I have shown the preferred embodiment of my invention, the details of construction may be varied without departing from the spirit of my invention, and I do not limit myself to the exact details shown.

What I claim is- 1. The combination of the hub and spring tooth mounted therein, of the cylinder mounted in the hub, and means for pressing the cylinder on to the tooth to secure it in position, substantially as described.

2. The combination with the hub having ribs forming a recess for the reception of the tooth, and having an opening therethrough, of a cylinder fitting the opening loosely and bearing on the tooth, and means for pressing the cylinder in position, substantially as described,

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