US1879193A - Tillage disk - Google Patents

Description

Sept. 27, 1932.

TI'LLAGE-DISK Filed June 8, 1931 2 Sheets-Sheet l .w. s. GRAHAM 1,879,193

Sept. 27, 1932. w s, GRAHAM 1,879,193

TILLAGE DISK Filed June 1931 2 Sheets-Sheet 2 A w w i,

Patented Sept. 27, 1932 UNITED STATES PATENT OFFICE WILLIAM S. GRAHAM, OF CANTON, ILLINOIS, ASSIGN OR TO INTERNATIONAL HARVES- TER COMPANY, A CORPORATION OF NEW JERSEY TILLAGE DISK Application filed June 8, 1931. Serial No. 542,770.

This invention relates to tillage tools and more particularly to the construction of tillage disks of the skeleton or open type.

Disks of the type stated are adapted to be used on agricultural machines for tillage purposes generally and are commonly used in pairs as covering disks on lister planters.

It as heretofore been the practice to construct such disks of assembled parts, as, for instance, the hub, spokes, and rim, which are riveted or otherwise secured together.

The main purpose of this invention is to do away with the cumbersome and expensive structure heretofore used and provide a onepiece skeleton disk having the strength and rigidity of the older structures while being of less weight and capable of production at less cost.

A preferred embodiment of the invention is illustrated in the accompanying drawings,

wherein- Figure 1 is a face or front view of the onepiece skeleton disk of this invent-ion;

Figure 2 is a rear or back view of the same;

Figure 3 is an enlarged cross section on the line 33, Figure 2;

Figure at is a cross section of the hub portion of the disk on the line 44, Figure 2;

Figure 5 is a cross section of a spoke on the line 55, Figure 2; and

Figure 6 is an enlarged detail sectional view through the disk rim where the spokes merge therewith.

The disk structure here disclosed is formed from a single piece of sheet metal, preferably steel, by any preferred method, as by pressing a disk blank into form and then cutting out the mettle between the spokes to provide a wheel-like or open concavo-convex disk of the form illustrated in Figures 1 and 2.

The disk as a whole is preferably of the usual concavo-convex type and its structure consists of a hub portion having a flatcenter 10 provided with a central opening for reception of a shaft or spindle and with suitable rivet or bolt holes, as shown, for securing the disk to the flange of a bearing sleeve. The flat central portion 10 of the hub is preferably offset inwardly or towards the concave side of the disk, as best seen in Figure 3, and is also of dished or arcuate form in cross section and extend from the annular dished portion 11 of the hub. These spokes merge at their outer ends into a rim 13, the periphery of which is beveled or sharpened, as at 14. In the preferred form illustrated the spokes are curved radially in the direction of the axis of the disk and the rim is continued on the arc of curvature of the spokes, thereby disposing the radial diameter or surface of the soil engaging rim of the disk at an obtuse angle to the axis. At the junction of the spokes with the rim the spokes are widened or flared, opposite webs of metal 15 being left to strengthen the structure at this point. 7

A disk of the construction described will be light, but rigid, as the arcuate formations in the hub and spokes reenforce the disk where desirable for resistance to the bending stresses to which the disk is subjected while in use. Moreover, the absence of rivet or bolt A coricavo-convex skeleton tillage disk.

consisting of an integral metal structure formed with a central portion provided with a shaft receiving opening, a flat annular portion immediately surrounding said opening,

an annular portion of arcuate cross section surrounding said flattened portion, spokes of arcuate cross section radiating from said arcuate annular portion, and a peripheral rim into which said spokes merge, the spokes being flared at their junction with the rim.

In testimony whereof I aflix my signature.

WILLIAM s. GRAHAM.

Images