US1741450A - Method of making traction lugs - Google Patents

Description

Dec. 31, {929. w. J. COULTAS 1,741,450

METHOD OF MAKING TRAGTIONLUGS Filed April 22, 1927 1 1.1 9 I zg z I gig/jar] Patented Dec. 31, 1929 UNITED STATES PATENT OFFICE WILBUR J'. COULTAS, OF MOLINE, ILLINOIS, ASSIGNOR TO DEERE & COMPANY, OF

MOLINE, ILLINOIS, A CORPORATION OF ILLINOIS METHOD OF MAKING TRACTION LUGS Application filed April 22,

The present invention relates to methods of making lugs for mounting on traction Wheels, and pertains more specifically to the manufacture of such lugs.

5 The type of lug to which the invention has reference is of inverted V-shaped section having laterally extending attaching flanges at the base portion thereof for bolting or riveting to the rim of a wheel. Lugs of this type have application to the wheels of tractors, farm implements and vehicles generally, where eiiicient tractive engagement wit-h the ground is desired.

The principal aim of the invention is to provide an improved method of making these lugs, whereby the cost thereof can be considerably reduced, and an improved construction of lug obtained.

Referring to the accompanying drawing illustrating the manner of carrying out my invention:

Figure 1 is a perspective view of the stock material from which the blanks are cut.

Figs. 2 and 3 are perspective views illustrating different steps in the process of manufacture, particularly where the blank is subjected to two die forging operations, and

Fig. 4i is a sectional view illustrating the mounting of this type of lug on a traction Wheel.

Referring first to Fig. 3 which shows one of these lugs in its completed form, it will be seen that it comprises an inverted V-shaped portion 6, constituting the traction or ground engaging part of the lug, and two laterally extending base flanges 7, by which the lug is fastened to the wheel. These base flanges have holes 8 punched therein for receiving bolts or rivets 9 which pass down through the rim of the wheel 10 (Fig. 4:). It should be noted that in the finished lug the angle of the intermediate V-shaped portion 6 is relatively acute, thus giving a traction portion which is quite sharply pointed, such being desirable for entering hard ground.

One of the features of the invention resides in manufacturing these lugs from standard angle bar stock of right angle cross section. Stock of this section can be bought on the market at a relatively low price, thus avoid- 1927. Serial No. 185,687.

outwardly projecting attaching flanges 7, and

which dies also squeeze the sides of the up standing angle portion together to produce the relatively narrow Wedge portion above referred to. This outward bending of the base flanges 7 and its squeezing together of the intermediate angle portion may be performed in a single forging operation, or in two distinct operations. WVhere it is desired to perform the same in two distinct operations the base flanges 7 may be bent outwardly in the first step, as shown in Fig. 2, and the intermediate angle portion then squeezed together in a separate operatiomproducing the finished shape shown in Fig. 3. The punching of the holes 8 may be performed in either of these operations, or in a separate operation.

It will be observed that the act of squeezing the wedge portion down to a smaller angle tends to crowd some of the metal together in the apex of the angle, as indicated at 14, thus increasing the sectional thickness of the lug at this point, for greater wear and strength. I prefer to reduce the angle of this intermediate wedge portion from. the 90 angle of the original stock to approximately 30, as shown in Figs. 3 and 4, but this angle in the finislied lug may, of course, be varied as desirec.

In mounting the lugs on metal wheels of the type shown in Fig. 4, I find it preferable to so arrange the lugs that a lug will be placed over the riveted outer end of each spoke 10.

This protects the riveted head. of the spoke against abrasion, and also results in a better transmission of the driving stresses between the spokes and the lugs. Where bolts are used to fasten the lugs to the wheel these bolts are preferably of the square shoulder carriage type and the holes 8 in the lugs are made square to hold these bolts against turning.

What I claim as my invention and desire to secure by Letters Patent, is

1. The method of making traction wheel lugs of the class described, which comprises taking a blank of approximately right angle cross section, bending the side portions thereof outwardly to form base flanges for the lug, and squeezing the sides of the intermediate angle portion of the blank towards each other.

2. The method of making traction Wheel lugs of the class described, which comprises cutting blanks from stock angle bar oi": approximately right angle cross section, and bending the side portions of each oi these blanks outwardly to form base flanges for the lug;

3. The method of making traction wheel lugs of inverted V-shaped cross section, which comprises cutting blanks from stock angle bar of right angle cross section and then subjecting each blank to the action of forging dies to bend tne side portions thereof outwardly into base flanges for the lug.

4. The method of making traction wheel lugs of the class described, which comprises taking a blank of angular cross section and squeezing together the side portions of the blank to form an intermediate tread portion for the lug of relatively narrow V-shaped section.

5. The method of making traction wheel lugs of the class described, which comprises cutting blanks from stock angle bar of approximately right angle cross section and then subjecting each of these blanks to the action. of forging dies to squeeze the side portions together to form an intermediate tread portion for the lug of relatively narrow V- shaped section.

6. The method of making traction wheel lugs of the class described, which comprises taking a blank of angular cross section, and bending the side portions thereof outwardly to form base flanges for the lug, and squeezing together the angle portion of the blank to form an intermediate tread portion for the lug of relatively narrow V-shaped section.

7. The method of making traction wheel lugs of the class described, which comprises cutting blanks from stock angle bar of right angle cross section, and then subjecting each of these blanks to the action of dies to bend the edge portion of each side flange outward- 1y to form base flanges for the lug, and to squeeze the intermediate angle portion to a reduced angle to form an intermediate tread portion for the lug of relatively narrow V- shaped section.

8. The method of making traction wheel lugs of the class described, which comprises cutting blanks from stock angle bar of right angle cross section, heating these blanks, subjecting each blank to the action of suitable dies to bend the edge portion of each side a tread portion for the lug of relatively narrow V-shaped section.

VVILBUR J. COULTAS.

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