US2349302A - Wheeled scraper - Google Patents

Description

May 23, 1944. p s 2,349,302

WHEELED SCRAPER I Original Filed Feb. 13, 1939 I c J? NVENTOR', F? 5. BY W Patented May 23, 1944 WHEELED SCRAPER Thomas R. Paulsen, South Milwaukee, Wis., assignor to 'Bucyrus-Erie Company, South Milwaukee, Wis., a corporation of Delaware Original application February 13, 1939, Serial No.

256,089. Divided and this application 1941, Serial No. 403,682

4 Claims.

My invention relates to new and useful-improvements in wheeled scrapers, and more particularly to that type of such scrapers in which the digging edge of the bowl is pivoted with a closure known as an apron capable of holding and carrying a substantial portion of the ex cavated dirt. Two subtypes of such scrapers are respectively illustrated in my U. S. Patent No. 2,106,759, issued February 1, 1938, and in U. S. Patent No. 2,159,045, issued May 23, 1939, to Horace C. Beitzel and myself. I

This present application is a division of my copending application, which resulted in Patent No. 2,257,761, issued October 7, 1941, and which application in turn was a copending continuation as to all common subject-matter, which includes all the subject-matter hereof, of my application, Serial No. 194,276, filed March 7, 1938; both of said prior applications being for, improvements in wheeled scrapers.

I have found that, when digging loose material such as dry sand with such scrapers, the sand tends to roll over and over in a cylindrical form with its axis parallel to the digging lip, and to flow out of the open digging end of the bowl just about as fast as it flows in.

Accordingly it is the principal object of this present invention to provide means whereby the incoming sand is instead distributed well into the bowl and the apron. This present divisional application is primarily devoted to the method of making an essential element of my invention.

In addition to my principal object, above stated, I have worked out a number of novel and useful details, which will be readily evident as the description progresses.

My invention consists in the novel parts and in the combination and arrangements thereof. which are defined in the appended claims. and of which one embodiment is exemplified in the accompanying drawing, which are hereinafter particularly described and explained.

Throughout the description, the same reference number is applied to the same member or to similar members.

Figure 1 is a longitudinal vertical section of a scraper embodying my present invention, and more particularly illustrating the passage of the sand. This scraper is here shown in its digging position.

Figure 2 is a transverse vertical section of my scraper, taken along the lines 2-2 of Figure 1.

Figure 3 is an enlarged vertical section of my digging lip, taken along the lines 3-3 of Figure July 23,

Figure 4 is an enlarged forty-five degree slant view of my digging lip, taken along the lines 4-4.

of Figure 3.

Figure 5 is similar to Figure 4, except that Figure 5 shows merely one end of the blade, and

that this showing is the variant which omits the forwardly projecting corners.

It should be noted that the representation of the dirt in Figures 1 and 2 represents flow-lines,

rather than the actual condition of the dirt at any given instant.

Referring now to Figure 1, We see that I I is one of the side beams of the frame of my scraper.

These beams extend to a forward wheel or wheels (not shown) of any convenient sort, and/ or to a draw-bar (not shown) for attachment to the tractor which is to pull my scraper.

The frame is supported by wheels I2, preferably rubber-tired, of which one is shown.

The bowl I3 is a boxlike structure, open at the top and front, and provided with a digging blade [4 along its front lower edge. The details of this blade constitute the principal item of my present invention. Y

The bowl is pivoted at IS, on two links l6, of which one is shown. Other linkage, of which a part is shown at H, supports the front of the bowl. The bowl is raised and lowered to its three positions (digging, carrying, and dumping) by means of rope I8 and appropriate cooperating sheaves.

The apron I9 is appropriately pivoted to the frame, and is raised and lowered by appropriate means, such as rope 20.

For the details of the operation of bowl and apron (which operation forms no part of my present invention except as generically claimed), see Patent No. 2,159,045 of Beitzel and myself, already mentioned. For an alternative cycle, see Patent No. 2,106,759, already mentioned.

Sufiice it to say here that my invention is applicable to any scraper which has a digging bowl and cooperating dirt-carrying apron, which apron opens when the bowl is in its digging position.

Turning now to Figures 3 and 4, it will be noted that my blade M has a double curvature as there shown. That is to say, the ends of the blade are higher and further forward than its center, and its digging edge is more inclined than its top edge. The phrase double curvature, as used by me, is broad enough to include abrupt changes of direction as alternative and equivalent to an actual curve.

It is to be understood that, when I refer to the ends of my blade as being higher and/or further forward than the center thereof, this language is intended primarily as a means of defining the curvature of my blade, and is not to be avoided by shearing off any portion of a blade thus curved. In fact, in practice, I occasionally do shear off the forwardly projecting lower corners, in a transverse vertical plane, as for example as shown at 25 in Figure 5. This shearing-off can, of course, occur either before or after any part of the bending is done.

By virtue of the double curvature of my blade, the dirt as dug is directed substantially vertically upwardly and centrally, as shown at 2| in Figure 1, whence it spills over as shown at 22 and 23, well back in the bowl and apron respectively, instead of merely rolling up in front of the digging edge as in the prior art. An additional function of this double curvature is that it directs the excavated material away from interference by the sides of the bucket and the apron, as shown in Figure 2.

The method of making my particular blade consists in first bending a long narrow piece of plate metal cylindrically about a longitudinal axis indicated by the point 24 in Figure 3, and then bending it cylindrically as indicated in Figure 4, about an axis not shown, inasmuch as its representation would lie off the top of the sheet of drawings.

Either before or after bending, preferably the former, it should be sharpened as indicated in Figure 3.

Either before or after bending, the lower forward corners may be sheared oil as indicated at 25 in Figure 5, and as already mentioned above.

Having now described and illustrated one form of my invention, I wish it to be understood that my invention is not to be limited to the specific form or arrangement of parts hereinbefore described and shown except as specifically covered in the appended claims.

' I claim:

1. The method of making the blade for a dirt digging scoop which consists in: taking a long narrow piece of plate metal; bending the blade cylindrically about an offset longitudinal axis; bending it cylindrically about an offset transverse axis; shearing off the forwardly projecting lower corners; and sharpening the lower long edge.

2. The method of making the blade for a dirtdigging scoop which consists in: taking a long narrow piece of plate metal; bending the blade cylindrically about an offset longitudinal axis; bending it cylindrically about an oifset transverse axis; and sharpening the lower long edge.

3. The method of making the blade for a dirtdigging scoop which consists in: taking a long narrow piece of plate metal; bending the blade cylindrically about an offset longitudinal axis; bending it cylindrically about an offset transverse axis; and shearing OK the forwardly projecting lower corners.

4. The method of making the blade for a dirt digging scoop which consists in: taking a long narrow piece of plate metal; bending the blade cylindrically about an offset longitudinal axis; and bending it cylindrically about an offset transverse axis.

THOMAS R. PAULSEN.

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