US1877879A - Road grader - Google Patents

Description

SCPI. A20, 1932. E, Q NERSON (1,877,879.

ROAD GRADER Filed Nov. 25. 1931 2 sheets-sheet 1 Sept. 20, 1932. E. c. lvERsoN ROAD GRADER Filed Nov. ,23. 1931 2 sheets-Sheet 2 gvwento'o Patented Sept. 20, 1932 UNrral) STATES PATENT OFFICE* -EMIL C. IVERSON, 0F INDIANAPOLIS, INDIANLABBIGNOB T0 J. D. ADAMS MANUFAC- TURING COMPANY, OF INDIANAPOLIS, INDIANA, A COBFOBATION 0F INDIANA nos @nanna Application lled November 23, 1931. Serial Io. 578,890.

My invention is concerned with road graders of. the type in which the mold-board or scraper blade is supported from the frame of the ,machine through mechanism which per- 5 mits the blade to be adjusted vertically and laterally of the machine as well as angularly to vary the disposition relative to the line of the draft. In such machines, it is customary to mount the blade beneath a draw-bar that 0 is connected at its front end to they grader frame through a universal joint which permits all desired draw-bar movements. At two laterally spaced points near the rear of the draw-bar it is connected to adjusting mecha- 5 nisms on the grader-frame, through which adjusting means the draw-bar can be adjusted in a generally vertical plane..

Many diierent mechanisms have been employed for securing the desired. lateral ad- 0 justment of the draw-bar, but my invention is concerned with mechanism for thispurpose which comprises two telescoping parts one of which is pivotally secured to the rear end of the draw-bar on a transverse axis in the draw- 5 bar plane and the other of which is connected to a transversely slidable block mounted near the rear end of the grader. Such a mechanism is well suited for all ordinary purposes where j it is desired to keep the rader blade fairly o well beneath the main rame; but if lit is desired to use this form of side-shifting mechanism in a grader where excessive lateral displacement of the mold board is desired, disadvantages occur owing to the nec- 5 essary length of travel of the transversel slidable block through movement of whic lateral.` adjustment ofthe draw-bar andv scraper blade is secured. l

It is the object of my invention to modify the form of side-shifting mechanism just described in such a way as to increase greatly the extent of the lateral adjustment provided for the mold board'or scraper blade. It is a further object of my invention to secure this result without the necessity for extensive modification of the details of the road grader construction.

In carrying out my invention, instead of connecting the rear end of the draw-harto the o transversely slidable block through a two-- connected to the draw-bar on a transverse axis in the draw-bar plane and the other of which is connected to the transversely slidableblock and longitudinally slidable in the first part I employ a three-part device. One art o this devlce is pivotally connected to t e rear end of the draw-bar on a transverse axis in the plane of the draw-bar, while a second part is connected to the laterally slidable block previously referred to. The third part of the device interconnects the two parts just mentioned, slidably receivin the latter and being pivotally connected to t e former on an axis` generally perpendicular to that of the connection between the former part and the draw-bar.

The accompanying drawings illustrate my invention: Fig. 1 is a perspective view illustrating the rear end of a road grader with the mold board in an extreme position of lateral adjustment; Fig. 2 is a fragmcntal erspective view from the side of the road) grader with the mold board in the eneral osition of adjustment illustratedin ig. 1; ig. 3 is a plan of a grader embodying one form of the device which I em loy in effecting lateral adjustment of the raw-bar; Fig. 4 is a view similar to Fig. 3 but on an enlarged' scale; Fig. 5 is a vertical section through the device illustrated in Fig. 4.; and Fig. 6 is a plan of a modified form of my inventlon.

The road grader 1n assoclation with which v m invention is illustrated comprises a wheel-supported main framelO below which a draw-bar 11 is mounted. The usual scraper blade 12 is secured to the draw-bar 11 through the medium of a semi-circle 13 that is pivotally connected to the draw-bar on an `ax1s perpendicular to the draw-bar plane in order to dispose the blade at any desired angle to the line of draft.

Near its rear end, the draw-.bar has mountv ed upon itcross members 14 the ends of which project laterally beyond the draw-bar and are secured respectively to links 15 which in turn are connected to the ends of crank arms 16 rotatably mounted on the grader frame. Control mechanisms 17 having operatin-g wheels 18 are provided for rocking the crank arms 16 to secure any desired adjustment of the mold-board 12 in a generally vertical plane.

To permit the desired movements of the draw-bar, it is connected to the front end of the frame 10 of the grader through a universal joint of any desired character. The joint illustrated in the drawing comprises an eye-bolt 20 which is pivotally mounted on a longitudinal axis at the front end of the draw-bar and the eye of which receives a vertical pin 21 carried by the main frame.

For the purpose of securing lateral adjustment ofthe mold board there is mounted near the rear end ofthe main frame a transversely Slidable block`25 carried by a suitable guide bar 26. yA chain 27, the ends of which are secured to opposite sides of the block 25 runs over sheaves 28 at the ends ofthe bar 26 and also over a sheave 29 mounted on the lower end of a shaft 30 which is adapted to be rotated by a hand wheel 31.

The construction as so far described is old. Adjustment ofthe mold board in its generally vertical plane is secured by operation of the wheels 18 in known manner. Lateral adjustment of the mold board is secured by connecting the rear end of the draw-bar to the transversely slidable block 25. Previous de vices employed for this connection have been of such a nature that the transversely slidable block 25 was always disposed in a plane extending longitudinally of the draw-bar and perpendicular to the plane thereof, and thus the. extent of lateral movement of the drawbar was limitedl by the length of the bar 26. By my invention I provide means for interconnecting the rear end of the draw-bar and block 25 in such a way that the draw-bar can swing laterally beyond the limits of movement existing in other devices. This means may take several forms, two of which are illustrated in the drawings.

In the arrangement illustrated in Figs. 2, 3, 4, and 5, a plate is pivotally connected to the rear end of the draw-bar 11 on an axis transverse to the draw-bar and in the drawbar plane. This connection is conveniently elected through the medium of a pin 36 which extends transversely of the draw-bar and which is received in holes in ears 37 on they under side of the plate 35.

To-the plate 35 I pivotally connect a member 40, the axis of such connection lying in a plane substantially transverse to the axis of the pin 36. Conveniently, there is secured to the lower side of the member 40 a strap 41 which is off-set in such a way as to provide between it and the under side of the member 40 a space within which the plate 35 may be received. The pivotal interconnection of the plate 35 and member 40 is alorded by a rivet or bolt 42.

On its, upper side, the member 40 carries spaced guides 44 which slidably receive a nemers tail-piece 45 the rear end of which is connected through a suitable universal joint with the transversely slidable block 25. This universal joint may take the form of a member 46 which is pivoted to the tail-piece 45 on a generally vertical axis and to the block 25 on `a horizontal axis.`

Means are provided for maintaining the plate 35 and the member 40 in any desired angular relation. To this end, the plate 35 may be provided with an arcuate series of holes 48 any one of which is adapted to receive a lock-pin 49 mounted in the member 40, as clearly shown in Fig. 5.

With the pin 49 in the center hole 48, the member 4() and tail-piece 45 will be i n substantial alinement with the draw-bar 11, and the side-shift mechanism will operate as did those of the prior art. When it is desired to extend the range through which `the mold board 12 can be moved laterally, the pin 49 is moved from the center hole 38 and placed in one or the other of such holes. Thus, for example, if it is desired to increase the extent to which the mold board 12 can be moved to the right, the pin 49 will be removedfrom the central hole 48, and the member 40 will be swung in a clockwise direction (Fig. 4) relative to the plate 35, and the pin 49 re-inserted. By this operation, the draw bar 11 will be swung to the right to a considerable extent and it will thereby be possible to place it in a position of extreme lateral adjustment such as that illustrated in Figs. 1 and 2.

In the arrangement illustrated in Figs. 1 and 6, the two parts 35 and 40, instead of being pivotally interconnected on a single axis as shown in Figs. 4 and 5, are each provided with a series of holes adapted to receive bolts so arranged that the two members can be held in various `positions of angular adjustment. In the specific arrangement illustrated in Fig. 6, the two members 35 and 40l are provided at their forward corners with respectively registering holes about either pair of whlch the two members can be angularly swung relatively to each other from the central dotted-line position shown in Fig. 6. If the member 40 is to be swung in a clockwise direction on the member 35, a bolt 50 in the holes at the left-hand forward corner of the members acts as a pivot for the adjustment. To hold the two members in adjusted y position, additional bolts 51 and 52 are provided, these bolts passing through holes so arranged as to be respectively in alinement when the two members 35 and 40 are in the desired angular relation. In addition to the holes specifically mentioned, the members 35 and 40 have other holes so disposed as to be capableof receiving the bolts 50, 51, and 52 when the two members 35 and 40 are in any desired position of relative angular adjustment.

As will be evident, the provision of the plate 35 and its pivotal connection to the member 40 serves to eiect a universal connection between the member 4() and the draw bar 11, as long as relative swinging movement of the two members 35 and 40 is unrestrained. When the 5 two members 35 and 40 are held in any definite angular relationship, as by means of the lockpin 49 of Figs. 4; and 5 or by means of thel bolts 50, 51, and 52 of Fig. 6, relative movement of the member 40 and the draw bar 11 is 1g confined to a simple pivotal movement about a single axis, the axis of the pin 36.

I claim as my invention: 1. In a road grader, a frame, a mold board, a draw-bar having its front end connected to said frame, means for adjusting the rear end of said draw-bar vertically relative to said frame, a part mounted on said frame for transverse movement in rear of said drawbar, a member pivotally connected to said draw-bar on an axis located in the plane of the draw-bar, a second member pivotally connected to said rst member on an axis generally perpendicular to the axis of the connection between said first member and said draw-bar, and a third member longitudinally slidable in said second member, extending rearwardly therefrom, and having its rear end connected to said transversely slidable art. P 2. In a road grader, a frame, a mold board, a draw-bar having its frontend connected to said frame, means for adjusting the rear end of said draw-bar vertically .relative to said frame, a part mounted on said frame for transverse movement in rear of said drawbar, a member connected to said draw bar for pivotal movement about two axes at an angle to each other, means for holding said member in any one of a plurality of different angular positions of adjustment about one of said axes, and a second member longitudinally slidable in the first-named member and connected to said transversely movable part. 3. In a road rader, a frame, a mold board, a draw-bar having its front end connected to said frame, means for adjusting the rear end of said draw-bar vertically relative to said frame, a part mounted on said frame for transverse movement in rear of said drawbar, a member connected to said transversely movable part, a second member pivotall `connected to said drawbar, provisions uidI ing said two members for relative rectillnear sliding movement, and means for varying the angle between the axis of pivotal connection of the first named member and the direction irlivhich said two members are relatively slida e.

4. In a road grader, a frame, a mold board, a draw-bar having its front end connected to said frame, means for adjustin the rear end of said draw-bar vertically re ative to said frame, a part mounted on said frame for transverse movement in rear of said draw` bar, and means interconnecting said drawlll

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