US1547438A - Short-turn device for pole trucks - Google Patents

Description

H. L. NELSON SHORT TURN DEVIGE FOR POLE TRUCKS July 28, 1925 Filed Aug. 51, 1923 INVENTOR. Z- W Anmrzmvx Patented July 28, 1925.

' HENRY L. NELSON, OFGANNON FALLS, MINNESOTA.

SHORT-TURN DEVICE FOR POLE-TRUCKS.

Application filedAugust 31, 1923.

To all whom it may concern."

Be it known that I, HENRY L. 'NnLsoN, a citizen of the United States, residing at Cannon Falls, in the county of Goodhue and State of Minnesota, have invented certain new and useful Improvements in Short- Turn Devices for Pole Trucks, of which the following is a specification.

My invention relates to attachments for pole trucks of harvesting and other implements and the object is to provide a simple and efficient anti-tipping device for such trucks. f

In the accompanying drawing:

ig. .1 is a top view of a portionof a binder, the draw bar of said binder and pole truck for same with my improvement attached. 7

Fig. 2 is an enlarged section on line 22 in Fig. 1.

Fig. 3 is an elevation on line 33 in Fig. 2.

Referring to the drawing by reference numerals, 5 in Fig. 1 represents the front part of a binder or other farm implement to which is pivotally secured as at 6 a draw bar 7. 8 is a brace secured as at 9 to the draw bar and pivotally secured as at 10 on the implement, to brace the pole and keep it in right relation to the implement.

11 in Fig. 2 is a whiifletree pivoted on bar 7 as at 12 for drawing the binder by horse-power and it may also be a member of a suitable evener permitting more horses to be used on one side of the draft pole than the other. Said draft pole has its rear end pivotally supported on the axle 14, (as at 15) of a pole truck having two flanged wheels 16 and 16 journaled on the right and left ends respectively of said axle.

17 is a vertically disposed bracket secured as at 18 to the under side of bar 7 near its front end. The lower end of it is ball shaped as at 17 to engage a socket 19 se cured at 20 on the top side of the draft pole or tongue 13 at a point forward of the axle 14.

The construction above set forth is com mon to many pole trucks. My device in volves a few minor changes in this construction and the securing of additional parts designed to prevent the tipping tendency of previous pole trucks whenever it is desired to make a turn. It will be readily understood that in such Serial No. 660,364.

former pole trucks the axle 14 and pole 13 are held rigidly at right angles to each other by angularly arranged braces 21 the rear ends of which are secured to the axle neareach wheel and the front ends secured to the pole at a common point (not shown) forward of the axle 14. Thus when it is desired to make a left turn with dotted in Fig. 1 the rigid position of the tongue 13 would be as indicated in dotted line 13 and the direction of pullby-the horses is indicated by arrow 13". Said pull is of course exerted at pin 12 of the draw bar 7 and beingdirected ina direction to the left of its center, the-draw bar through its ball joint exerts a' direct side pressure on the truck pole 13. Inasmuch as the ball joint is forward of the axle the left 7 turn causes the left truck wheel to swing under the draw bar 7 and the right hand wheel is swung forward obliquely. The pull at point 12 on the draw bar being to the left and the truck wheel 16 being swung under said bar the side pressure has a tendency to make said left wheel dig into the ground and simultaneously wheel 16 is forced upwardly and the result is a tipping of the entire pole truck that renders it practically useless.

I have found that by keeping the direction of the pull forward of pivot 12 as nearly as possible in a straight line with the longitudinal center of the draw bar, while a turn is being made, the pole truck may be turned at a comparatively sharp angle and no tipping will occur. The means for accomplishing this are as follows The draft pole or tongue 13 is pivotally secured to the axle 14 (as at 15 in Figs. 2 and 3) and the axle braces 21 have their front ends secured together by a vertical bolt 22 which is passed through the center of a bar 23 arranged longitudinally under the tongue and the draw bar. The forward end of said bar is pivotally secured as at 24 to the under side of the draft pole 13 and the rear end of the bar is loosely bolted and supportedas at 25 (Figs. 2 and 3) 0n the horizontal part of a U-shaped hanger suspended from a horizontally arranged bolt 27 in draw bar 7. Bolts 24 and 25 are equidistant from bolt 22 and the bar 23 is pref erably a heavy fiat steel bar. In making a the pole truck to about the position shown i h drawn the original alinement. The pivot bolt 22 being secured to the braces 21 thus cause the axle 14 and wheels16 to be turned faster than the tongue, the result being that as longas'turning of the pole or'tongue 13 is taking place there is a side strain of bar -23 "which being fixed with axle, the pole 13 gradually assumes a'more obtuse angle with relation to the axle. This side movement of tongue or pole 13 relation to the and consequent'swingingof the axle creates whatmay be-called a side strain or tension inthe parts just described, all in a horizontal plane underneath the draft pole or tongue 13 and level withfthe axle. The turning force thus being exerted on a low level and the level of the axle there is no other force tending to tip the truck axle the wheels of which will ride on the "ground "intheirpr'oper horizontal relation.

normally at right angles thereto, at its center is.

said axle,

other,- longitudin ally under the draw bar and draft What I claim is r In a pole truck device of the class described, a two wheeled truck a'tongue pivotally secured on the axle of said truck and means adjacent said pivot on the tongue for pivotally supporting a'draw bar of an agricultural implement, means mounted to operate substantially in a horizontal plane with the truck axle and operatively connected with the tongue and the draw bar, to

swing the pole truck niorerapidly than the tongue when the tongue and the draw bar are brought out of alinement with each said means comprising a bar arranged pole,- the forward end of said barpivotally secured to the tongue forward of the truck axle and the rear end of said bar pivotally secured to a hanger bracket depending from the draft pole rearward of the truck axle,

axlebraces secured to the axle at points adjacent the wheels andextending forwardly diagonally to a common pivot on said bar.

In testimony whereof I afiix my signature. a L. 1 NELSON.

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