US2239943A - Bulldozer - Google Patents

Description

PEEK 29,1941. R SWORD 2,239,943

BULLDOZER Filed April 14, 1939 IN YEN TOR.

ATTORNEY.

Fdtented Apr. 29, 1941 BmmmR Robert dword iiinalaw, @reg. Application April id, 1939, beriai No. Ziiibtd 3 Claims.

This invention relates to bulldozers and is particularly adapted to facilitate the tilting of the blade.

The primary object of the invention is to provide a connecting framework between the bull- ClL di -Md) dozer blade and the tractor that is flexible and that will permit the raising or lowering oi either end of the blade without twisting the blade.

Another object of the invention is to provide connections for a bulldozer blade relative to a tractor that can be operated while the tractor is in motion for tilting, raising or lowering of the blade.

A still further object of my invention is to provide means for raising or lowering the blade equally throughout its length or raising one end of the blade without moving the opposite end or lowering one end of the blade while the opposite end is raised without in any way twisting the blade.

And it further object of my invention is to provide control levers that can be operated touether in unison or operated separately for difierent manipulations of the blade.

These and other incidental objects will be apparent in the drawing and specification to follow.

Referring to the drawing:

Figure l is a side view or my new and proved bulldozer mounted on a tractor.

Figure 2 shows a rear perspective view of the bulldozer blade removed from the tractor, the framework partially broken away.

Fhure 3 is a plan detail view of one of the socket fittings for holding the framework to the blade.

Figure 4 is a sectional view of Figure 3.

Figure 5 is a dlagramrnatical lay-out of the raising and lowering cylinders in connection with their control valves and illustrating the manner in which the control levers are hooked up thereto.

In the drawing: A commonly known type of bulldozer blade is indicated by numeral i, but any type of blad may be employed. The tractor is indicated at 2. Rearwardly extending bars d end t are pivotally connected to the blade 5 at b and 5. They may be pivotally connwted, as shown, through a ball and socket connection. In the drawing, I have shown a socket i that may be formed in two sections, as sections 8 and 9, section b of which may be securely fastened to the blade t by any suitable means, for instance welding could be employed. The half section b may be removed and is held in place by bolts to. men the section it is in place it will support 7 the boil it, which is formed integral with the her 3, and holds each bar in a pivotally mounted relation. 1 do not wish to be limited to this par tieular type oi connection, as other forms off mechanical connections might be employed, for providing a plvotally mounted connection to the bars 3 and t relative to the blade l.

The opposite ends it or the bars 3 end t are so connected to the tractor E that such bars are capable of limited universal swinging and rocking movement relative to the spindle it, which may be secured to any convenient location on the tractor. The connection between the spindles it end the bars ii and ii is such as to permit pivotal play of the bars with sufficient freedom of move= ment as to permit tilting of the blade without binding or warping of the parts. Braces id and it brace the blade I! in twodirections, that is brace the upper edge of the blade it from tilting backward or forward and form corner braces between the bars ti and t and the blade l. Refez-ring to Figure 2 it will be noted that the inner ends that are connected to the blade E or these cross braces It and it almost meet in the upp center of the blade relative to its length.

The braces it and it are connected to the side frames 3 and d by suitable pivot socket fittings ill and they are connected to the blade by means of the socket connections it. These connections permit pivotal movement of either end of the braces it and lb. It is apparent that the front end of the push arms and or the diagonal brace on each side must be pivotolly connected to the blade to permit swinmng movement of the arm and brace on one side as a unit about an axis running through the points of the pivotal connections of these parts. The braces may be formed in two parts, such as tubes it and 2b telescopically related and locked at any desired point, as by locking means it, to provide for angular adjustment of the blade.

The blade may be raised and lowered by any suitable raising or lowering means. I have illustrated bell cranlm 2t pivotally mounted at 23 to a main frame structure it. Fluid pressure cylinders 25, having their pistons it connected to the arm ill at 28 control the position of the hell cranks 2s. A connecting link it connects socket fitting at on each of the braces it and it odiocent its one end remote from the blade to the corresponding bell crank 22 by pivot connection ti.

In the operation or my new and improved bulldozer blade the cylinders 25 are controlled by suitable valves 32, governed by handles 33 either simultaneously, separately or in opposite directions. For instance if the handles 33 were held together and manipulated in either direction the valves 32 would act in unison supplying fluid to the cylinders 25, raising or lowering the bulldozer blade without tilting either end. In case it is desired to raise one end of the blade while the other remains stationary one of the handles 33 would be operated, controlling one of the valves 32 and supplying only one of the cylinders with operating fluid. In this case one endof the blade would be raised or lowered. If the levers 33 were operated in opposite directions one end of the blade would be raised and the opposite end would be lowered.

X will now explain the main feature of my invention. By observing Figure 2 closely it will be noted that if one end of the blade were raised, for instance the left side relative to the drawing, there would be a hinging action on line A-B which would allow the blade to be raised or lowered without twisting. At the same time the brace it would brace the blade on its vertical line, while acting as a brace against side thrust between the side frame 3 and the bulldozer blade 9. A corresponding hinged line BC must be considered in the operation of my new and improved bulldozer, these lines A-B and 3-6 indicate the principle of my invention. By placing the braces as shown, solid support is given the bulldozer blade as heretofore described, while also providing flexibility when either end of the blade is raised or lowered, commonly known as tilting the blade.

I do not wish to be limited to the particular mechanical embodiment, as other types of mechanical combinations may be used, still coming within the scope of the claims to follow.

What is claimed to be new is:

1. A bulldozer, bars extending from the lower outer ends of the bulldozer to a road vehicle, the connection of-the bars to the road vehicle being mounted for limited universal swinging and rocking movement, said bars supporting the bulldozer for movement with respect to the vehicle, braces intermediate the bars and bulldozer, the braces being connected at one end'to the bars at a distance from the bulldozer, and being connected at the bulldozer at the upper end or" the latter and adjacent the vertical central line of the bulldozer the ends of a brace and bar being connected to the bulldozer on one side at the center line thereof and arranged to permit swln ing oi the arm and brace as a unit about an axis running through the connection of said arm and brace to the bulldozer, a power means operative from the vehicle, connections from the power means, said. power means serving to actuate either or both of the braces-at will, the operation of one such brace tending to tilt the bulldozer on the pivotal support of the opposite bar, and the operation of both of said braces serving to raise or lower the bulldozer through the medium of the pivotal connected bars.

2. A construction as defined in claim 1 wherein the connection between the power means and the braces is adjacent the connection of the braces to the bars.

3. A construction as definedin claim 1 wherein the braces are of telescopic formation, capable of being secured at different lengths.

ROBERT SWORD.

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