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Publication numberUS2302702 A
Publication typeGrant
Publication dateNov 24, 1942
Filing dateJun 9, 1937
Priority dateJun 9, 1937
Publication numberUS 2302702 A, US 2302702A, US-A-2302702, US2302702 A, US2302702A
InventorsFrancis P Leschinsky
Original AssigneeFrancis P Leschinsky
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Bulldozer attachment
US 2302702 A
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Description  (OCR text may contain errors)

1942- F. P. LESCHINSKY 2,30

BULLDOZER ATTACHMENT Filed June 9, 1937 2 Sheets-Sheet 1 o l 91 f o E1 27 2a 7 OR. FRA was 1? LfiscHl/vskY ATTORNEY.

Nov. 24, 1942. F. P. LESCHINSKY 2,302,702


Patented Nov. '24, 1942 BULLDOZEB ATTACHMENT Francis P. Leschinsky, Berkeley, 08111. Application June 9. 1937, Serial No. 147,203

,4 Claims.

This invention relates to attachment to tractors and bulldozers, and the like.

The primary object of the invention is to pro-' I justed to penetrate the ground to a desired depth or which may be brought selectively or together into entirely inoperative positions.

Another object of this invention is to provide an attachment for earth working machinery which is highly useful and simple in construetion. Convenience of arrangement, lightness and comparative inexpense of manufacture are fur- Figure 6 is a sectional view of a blade and its mounting in digging position.

Figure 7 is a sectional view of a blade and its mounting in the return, sliding position.

Figure 8. is a sectional view of a blade and its mounting, in an inoperative position.

ther objects which have been borne in'mind in the production and development-of the invention.'

I am aware that some changes may be made in"the general arrangements andcombinations of the several devices and parts, as well as in the details of the construction thereof without departing from the scope of the present inventionas set forth in the following specification, and as defined in the following claims; hence I do not limit my invention to the exact arrangements and combinations of the said device and parts as described in the said specification, nor do I confine myself to the exact details of the construction of the said parts as illustrated. in the accompanying drawings.

With the foregoing and other objects in view, which will be made manifest in the following detailed description and specifically pointed out 'in the appended claims, reference is had to the accompanying drawings for the illustrative embodiment of the invention, wherein:

Figure 1 is a somewhat diagrammatic side view of my attachment in place on a bulldozer on a tractor.

Figure 2 is a top plan view of my attachment.

Figure 3 is a sectional view, the section being taken on the line 33 of Fig, 2.

Figure 4 is a fragmental sectional view of a blade and its mounting.

Figure 5 is a Iragmental plan view of the blade and its mounting.

Figure 9 is a sectional view of a blade and its mounting turned into an inoperative position by the shaft, and

Figure 10 is a fragmental side view of the blade adjusting elements.

In carrying out my invention in the illustrative embodiment shown in the drawings I make use of a bulldozer Ni of the usual type which includes the bowl I! supported on side arms l8, or the like, which latter are fulcrumed on bearings l3, at the trailing end of a tractor 20. The bulldozer I6 is lifted and lowered relatively to the ground by a usual mechanism such as the hydraulic ram 2|.

My attachment is preferably placed between the trailing faceof the bulldozer bowll1 and the leading end of the tractor 20. On each side arm l8 is provided a bearing bracket 22, in which is journaleda shaft 23 in parallelism with the bulldozer bowl I! but so positioned as to be clear of the leading end, or radiator of the tractor 20.

On this shaft 23 are supported a plurality of blades 24', Every second blade is longerthan the next adjacent bladesso as to facilitate the loosening of the ground around the blade path. Each blade 24 is curved at one end and has the other end thereof fixed between the ears 26 of a bearing 21 which latter is suitably journaled on the shaft 23.

.Each bearing 21 has a substantially annular groove 28 which slidably fits over a radial projection 29 fixed on the shaft 23. This projection 29 determines the position of a bearing 2! and prevents the latter from sidewise displacement. The secured end of each-blade 24 is extended into the groove 28 and is tapered on each side at such angle as to fit over and abut on the respective projection 29. Thus the projection 29 also functions as an abutment both in operative and inoperative positions.

The shaft 23 is adjustably fixed in position by means of a disc 3| fixed on an end of the shaft 23 and provided with holes 32 arranged on a semicircle. A threaded hole 33 in the adjacent side arm 18 is on the same radial distance from the center of the bearing bracket 22 as the holes 32 are from the center of the shaft 23, so that the holes 32 may be selectively brought into alignment with the hole 33. Then by a suitable bolt 34 extended through the aligned holes 32 tent smooth the surface.

and as the shaft 2: is held in an adjusted angular" position. All the bearings are preferably provided with anti-friction means, such as linings or the like. I

In. operation inasmuch as the attachment is supported on the sidearms l8 it will be raised or lowered relatively to the ground every time the bulldozer i6 is raised or lowered by the ram 2i, When the bulldozer I6 is on the ground in operative position, then the weight of the equipment and action of the usual hydraulic ram 2i urges the blades 24 into the ground. As the bulldozer I6 is pushed forwardly namely in the direction of the arrow A in Fig. -1 and Fig. 7

the blades 24 roll around the shaft 23 until they reach the position shown in Fig. 7, namely the backs of the blades 24 rest and slide "on the surface. The blades 24 in this position freely follow the contourofthe surface, and to a certain ex- As the tractor and bulldozer I 6 are moving rearwardly, namely in the direction of the arrow B in Fig, 2, Fig. 3, and

Fig. 6, then the blades 24 are pressed into the ground. The turning of the blades 24 ina contraclockwise direction is resisted by the abutment projection 29, so that the weight of the bulldozer equipment causes the blades 24 to cut and loosen the ground. The shorter blades 24 in this digging operation precede the longer blades 24 so that the working of the latter is facilitated by reason of the loosening of the lateral furrows,

The angle of the operative position of the blades 24 is determined by the position of the projection 29. In order to adjust such angle, first the bolt 34 is removed, then a handle 36 may be fitted-over the end of the shaft and keyed in place by a pin 31. A bar or other suitable means may be also provided to supply the leverage for turning the shaft 23. In order to deepen the cut of the blades 24 the shaft 23 and the projections 24 therewith are adjusted in a clockwise direction viewing Fig. 6 or Fig. 10. On the other hand by adjusting'the shaft 23 and projections 24 in contraclockwisedirection, viewing the same figures, the projection 24 is raised and allows the blades -24 to swing .higher out of the ground under pressure, therefore lessen the depth of the cut. The depth of the cut relatively to the bulldozer level therefore may be preadjusted and then fixed by replacing the bolt 34 to hold the shaft 23 non-rotatable. I

The area of cut may be also determined by rendering certain of the blades 24 inoperative. This is accomplished by turning one or more selected blades 24 in a clockwise direction into the position shown in Fig. 8. In this position the blade 24 rests on the upper side of the projection 29 and is thus resting in an out of way position. Thus for instance all blades 24 on either half of the tractor, or in the center may be rendered inoperative and the digging limited to a strip of'predetermined width relatively to the bulldozer,

position shown in Fig. 9, and to lift all the blades 24 into the upward pointing, out of way position. The shaft is adjusted and fastened as hereinbefore described,

It will be recognized that the use of the attachment heretofore described obviates the necessity for a separate ground breaking or loosening tool. The attachment can be easily assembled, and thereafter quickly rendered operative or inoperative at will. The operation is selective as to width and readily adjustable as to depth or spacing. The use of my invention-heretofore described also permits the turning around of such implements on a comparatively small arc, instead pivoted means spaced from said pushing element being adapted to ride on the surface of the ground during the moving of the bulldozer pushing element in one direction and to penetrate the ground during the moving of thebulldozer in the opposite direction, and means for adjusting said pivoted means so as tosimultaneously move said bulldozer pushing element and said grolmd breaking elements into and out of operative positions relatively to the ground and to the vehicle frame.

2. The combination with a vehicle frame, a bulldozer pushing element, arms extended from the bulldozer pushing element and pivoted to the frame of the vehicle, a plurality of ground breaking elements so supported on' said arms as to be operable only when the vehicle is moving in one direction, and means connected to the vehicle frame for adjusting said arms so as to ad- Just said bulldozer pushing element and said ground breaking elements together relatively to the ground independently of the wheels of the vehicle. 3. The combination with a vehicle frame,- a bulldozer support extended forwardly of the frame and carrying a bulldozer pushing element, and means to adjust said support relatively to said vehicle frame and to the ground; of a pinrality of ground breaking elements, means of connection between-said elements and said support for vertically adjusting said elements relatively to the ground by the vertical movements of the pushing element. a V

4. In a bulldozer, a frame pivoted on a vehicle, a bulldozer pushing element on said frame beyond an end of said vehicle, ground breaking means carried on said frame between said bulldozer pushing element and said end of the vehicle, and means for adjusting said frame so as to simultaneously raise and lower said bulldozer pushing element and said ground breaking means, and means to hold said ground breaking means in penetrating position only durng movement in one direction.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2634520 *Apr 20, 1950Apr 14, 1953Foster Clayton BEarth excavating teeth for bulldozer moldboards
US2648268 *Sep 5, 1947Aug 11, 1953Deere & CoUnit carrier
US2665016 *Dec 7, 1951Jan 5, 1954Etchart Leonard WHydraulic loader and handling means for trucks
US2674818 *Oct 18, 1948Apr 13, 1954Earl CarnesDigging attachment for bulldozers
US4418759 *Aug 28, 1981Dec 6, 1983Mork Orlan HSoil leveling apparatus
US4448258 *Jan 12, 1981May 15, 1984Mork Orlan HSoil leveling apparatus
US4448260 *Apr 7, 1982May 15, 1984Wayne A. HarmsenPivotal blade spikes for tractors
US4467876 *Oct 19, 1981Aug 28, 1984Gaule Ronald LRipper tooth means
US4585075 *Jan 13, 1984Apr 29, 1986Mork Orlan HSoil leveling apparatus with improved frame and hitch
US4924945 *Oct 13, 1988May 15, 1990Mork Orlan HSoil leveling apparatus with improved scraper member
US5024280 *Jun 27, 1989Jun 18, 1991Mork Orlan HSoil leveling apparatus with improved frame and hitch
U.S. Classification172/197, 414/912, 172/712, 172/201, 172/662
International ClassificationE02F3/815
Cooperative ClassificationY10S414/125, E02F3/8155
European ClassificationE02F3/815D