US3088232A - Replaceable shoe for scraper bowl edges - Google Patents

Description

May 7, 1963 H. F. GILBERTSON 3,088,232

REPLACEABLE SHOE FOR SCRAPER BOWL EDGES Filed June 15, 1962 2 Sheets-Sheet 1 'INVENTOR. HERMAN F. GILBERTSON May 7, 1963 H. F. GILBERTSON I REPLACEABLE SHOE .FOR SCRAPER BOWL EDGES 2 Sheets-Shoat 2 Filed June '15, 1962 INVENTOR. HERMAN F. Gnezmsou I Pmvs.

United States Patent 3,088,232 REPLACEABLE SHGE FOR SCRAPER BGWL EDGES Herman F. Gilbertson, N. 4920 Rebecca, Spokane, Wash. Filed June 15, 1962, Ser. No. 202,879 4 Claims. (Cl. 37-141) This invention relates to replaceable shoes for scraper bowl edges of the type utilized on earth-moving implements and is particularly designed for use with earthmoving scrapers having a forward cutting blade bounded by vertical cutting edges.

It is customary in the earth-moving implement field to provide side cutting edges on scrapers to define a sharp boundary line where material has been removed. In many machines the lower corner is integral with the larger sidewall on which it is formed. This forward corner is vulnerable to excessive wear due to rocks and hard earth surfaces. Replacement of these corners is necessary periodically and requires a considerable amount of time and skill where the corners must necessarily be welded. Various replaceable bits or covers have been offered for use on these corners. However, to date, each of these corners has utilized conventional mounting means such as bolts, which necessarily require projecting heads which are subject to damage and shearing actions.

The present invention contemplates a replaceable shoe for the vulnerable corners of a scraper which may be mounted on the sidewalls without the use of a bolt or other projecting mounting apparatus.

It is a first object of this invention to provide with a specially constructed corner structure a replaceable shoe which may be readily applied to the scraper or removed without the requirement of special skills or tools. The present invention contemplates a shoe which is held in place by complementary surfaces on the mating parts and by a simple knockout pin.

Another object of this invention is to provide such a shoe with no projecting surfaces which are subject to damage or exceptional wear. The shoe in this instance comprises entirely smooth outer, surfaces when mounted on the sidewalls of the scraper.

One further object of this invention is to provide a replaceable shoe which covers the mating surfaces of the shoe and sidewall so that the machined areas are completely protected in use from damage due to the material being Worked upon.

These and further objects will be evident from a study of the following disclosure taken in conjunction with the accompanying drawings which illustrate one prefeired form of this invention. It is to be understood that this form of the invention is exemplary and is not intended to completely limit or restrict my invention except as the invention is defined in the claims following this detailed description.

FIGURE 1 is a perspective view of an earth-moving scraper showing the relationship of the instant shoe to the scraping surfaces;

FIGURE 2 is a fragmentary side view of the cutting corner on the earth-moving scraper showing the assembly of the instant shoe, the final position of the shoe being illustrated in dashed lines;

FIGURE 3 is an end view of the assembled shoe as seen along line 3-3 in FIGURE 2;

FIGURE 4 is a fragmentary perspective view of the assembled shoe;

FIGURE 5 is a top view of the replaceable portion of the shoe as seen along line 55 in FIGURE 2;

FIGURE 6 is a sectional view through the assembled shoe as seen along line '6-6 in FIGURE 2; and

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FIGURE 7 is a sectional view through the assembled shoe as illustrated along line 77 in FIGURE 2.

In FIGURE 1 of the accompanying drawings an earthmoving scraper of the type with which the present invention may be utilized is illustrated as including a bowl or body 10 which is pivotally supported adjacent its rear end by a pair of wheels 11. The scraper is supported at its forward end on a tractor (not shown) by a conventional draft connection 12. The bowl 10 is provided with a blade 13 adjacent its forward portion to aid in the collection of earth in the bowl 1% in the normal manner. The blade 13 is replaceably mounted on the body of the bowl 10 in the conventional manner.

The bowl is provided with a front gate or apron 14 which may be utilized to prevent the spilling of earth from bowl 10 during transportation and which also is capable of regulating the amount of earth that can pass into the bowl 10 during loading operations utilizing the blade 13.

The normal operating procedure when using such a scraper is to lower the bowl 10 about the axis of its wheels 11 until the blade 13 engages the ground to be moved. The tractor then draws the bowl 10 forward, and earth engaged by the blade 13 will be deposited in the bowl 10 for transportation.

The side boundaries of the blade 13 are customarily formed by short cutting bits formed at the lower front corners of the sidewall 15 of bowl 10. Since the corners are vulnerable to rocks and other materials which eifect injury to the corners, the present invention is concerned with a replaceable shoe to provide a long wearing and easily repairable surface at this wear point. The sidewalls 15 each terminate in an upright front edge 16 and a lower edge 19. In order to practice the instant invention, it is necessary to cut away a rectangular portion of the walls 15 at their lower front corners to provide a recessed lower edge 17. The recessed area is then filled by a plate 27 which is integrally secured to the sidewall 15 by common welding procedures. This plate 27 is also welded to the permanent portion of the blade 13 and becomes a part of the bowl 10. The plate 27 is provided with a forwardly and downwardly directed projection 18 which is of reduced thickness. This projection 18 is located on the front edge 16 of the wall 15. Along the lower edge 17 are formed a pair of upwardly and rearwardly directed grooves 20 cut in opposed relationship on each side surface of the wall 15. The grooves 20 are parallel to the blade 13 and parallel to the projection 18.

The replaceable portion of the invention comprises an L-shaped shoe 21 of a thickness somewhat greater than the thickness of the sidewall 15 upon which it is to be mounted. The inside corner of the shoe 21 is provided with two intersecting edges 22 and 23 which are formed complementary to the edges 16 and 17 respectively of the plate 27. The first edge 22 is provided with a recess 24 complementary to the projection 18 and adapted to receive the projection 18 therein. Along the top of the edge 23 are two raised ribs 25 adapted to slidably engage the grooves 29 on the wall 15.

It should be apparent from the drawings and from the above description that the shoe 21 may readily be mated with the modified sidewall 15 by slipping the projection 18 into the recess 24 while engaging the grooves 20 by the ribs 25. This assembly is .best seen in FIGURE 2. In order to lock the shoe to the wall 15 a coaxial set of apertures 28, 2.8 is cut through both the plate 27 and the shoe 21 and a locking pin 26 is fitted therein after positioning the shoe 21. The locking pin 26 is preferably a tight fit so that it will remain in place until knocked out by use of a punch or similar implement.

Thus I have described a very simple replaceable shoe which can be readily adapted to any vertical cutting edge on heavy equipment such as an earth-moving scraper. The practice of this invention does not in any way modify the normal earth-moving operations but insures that the earth-mover may always be provided with a Well-conditioned cutting edge so as to define its bite. The addition of the removable shoe provides no outwardly extended projections which are subject to damage during use of the scraper. No bolt heads or nuts are provided in vulnerable positions, and the machined surfaces of the ribs 25, grooves '20 and projection 18 are entirely enclosedand not subject to damage. The shoe 21 may be readily replaced at the job site by simply knocking out the pin 26 and slipping a new shoe 21 onto the wall 15.

While I have shown and described one practical side of my invention, it is to be emphasized that the specific configuration illustrated isnot intended to limit or restrict my invention beyond the definitions set out in the claims which follow.

Having thus described my invention, I claim: 1. In combination with a scraper side wall having an upright leading edge and a lower edge;

a shoe having an L-shape having an inside corner with two inner edges complementary to said leading edge and lower edge of said side wall respectively;

diagonally directed means on said wall and said shoe 25 adapted to intermesh with one another to thereby locate said complementary edges to one another, said diagonally directed means being projected forwardly and downwardly relative to the side wall;

and locking means interconnecting said wall and said shoe adapted to prevent motion of said shoe relative to said Wall. a

2. The combination as defined in claim 1 wherein said,

diagonally directed means comprises complementary projections and recesses formed on adjacent surfaces of said wall and shoe, the exterior surfaces thereof being smooth.

3. In combination with a scraper side wall having an upright front edge, a projection extending downwardly and forwardly'from said front edge adjacent the lower corner thereof and parallel diagonal grooves cut along its side surfaces adjacent the lower edge thereof in opposed relation and parallel to the projection;

a shoe having an L-shape complementary to the front lower corner of said wall adapted to form an extension of the front end and the bottom of the wall;

said shoe being provided with a socket formed through one inner edge thereof, adapted to receive the projection on the front-edge of said Wall;

said shoe further being provided with upstanding diagonal ribs projecting upwardly and rearwardly of its top surface adapted to seat in the grooves of said Wall;

and locking means interconnecting said Wall and shoe adapted to prevent motion of said shoe relative to said wall.

4. The combination as defined in claim 3 wherein said locking means comprises a pin fitted within coaxial recesses cut through said plate and shoe, the outer ends thereof being flush with the exterior surfaces of the shoe.

References Cited in the file of this patent UNITED STATES PATENTS

Claims (1)

1. IN COMBINATION WITH A SCRAPER SIDE WALL HAVING AN UPRIGHT LEADING EDGE AND A LOWER EDGE; A SHOE HAVING AN L-SHAPE HAVING AN INSIDE CORNER WITH TWO INNER EDGES COMPLEMENTARY TO SAID LEADING EDGE AND LOWER EDGE OF SAID SIDE WALL RESPECTIVELY; DIAGONALLLY DIRECTED MEAND ON SAID WALL AND SAID SHOE ADAPTED TO INTERMESH WITH ONE ANOTHER TO THEREBY LO-

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