US1192127A - Scraper. - Google Patents

Description

J. SHOSTBOM.

SCRAPER.

APPUCATION FILED 1uLY1s. 1915.

1 ,1 92,1 27. v Patented July 25, 1916.

@7071; Shostrorn/ WWI Gums UNITED "STATES PATENT OFFICE.

JOHN snosrnom, or TACOMA, WASHINGTON.-

somnn.

17 '0 all whom it may concern:

Be it known that I, JOHN SHos'rRoM, a citizen of the United States, residing atTacoma, in the county of Pierce and State of Washington, have invented certain new and useful Improvementsin Scrapers, ofwhich the following is a specification.

This invention relates to earth scrapers and has for its object the provision of means whereby when the scraper is drawn rearwardly the cpncave back plate and the scraper teeth will be protected and wear of the same avoided.

A further object of the invention is to so arrange the apron or protecting shoe that it will be automatically shifted to a position in rear of the scraper or below the same when a pull is exerted on the scraper to effect travel of the same. v I

The stated objects of the invention and other objects which will incidentally appear are accomplished in a mechanism such as is illustrated in the accompanying drawings, and the invention resides in certain novel features which will be first duly described and then more particularly pointed out in the claims following the description.

Inthe drawings: Figure 1 is a perspective View of a scraper embodying my improvements, Fig. 2 is a longitudinal section of the same showing the parts arranged to permit rearward travel of the scraper, and

Fig. 3 is a side elevation showing the parts in the position assumed when the scraper is at work.

The scraper illustrated consists of side plates 1 and a concave back plate 2 connecting the rear edges of the said side plates. Draft cables 3 are attached to the front ends of the side plates, and the back plate 2 has its lower edge projecting slightly below the lower edges of the side plates and extending forwardly, as clearly shown in Figs. 2 and 3. The said rear plate or back of the scraper may be secured to the side plates in any convenient or preferred manner, and in the drawings, I have illustrated the said back as constructed with flanges 4 which fit against the inner surfaces of the side plates and are riveted or otherwise rigidly secured thereto. This construction, however, is illustrative only and any other preferred construction may be employed.

- Along the loweredge of the back 2 are secured the usual scraper or excavator teeth 21 and on the side plates are keeper plates Specification of Letters Patent.

Patented'July 25-, 1916.

Application filed July 13, 1915. Serial No. 39,569.

or brackets 22. Pivots .7 in the rear ends of said brackets support the standards or arms 6 which project upwardly adjacent the outer faces of the side plates and carry the'apron or runner plate 5, the pivots 7 being preferably at the center of the arc defined by the back 2 so that the said plate or apron may swing rearwardly to the position shown in Fig. 3 without binding upon the back or being restricted by any interference with the back. The rear portion of the apron is curved upwardly, as shown at 8, and at the center of the said upturned portion, I secure the end of a cable 9 which' passes upwardly to and over apulley 10 mounted upon the back 2 near the upper edge thereof and then extends forwardly above the scraper and is connected to the draft devices. I also secure to the rear edge of the apron or runner plate other cables 11 which extend rearwardly therefrom to the enginel It is thought the operation of the device will be readily understood from the fore- I going description, taken in connection with the accompanying drawings When the scraper is at work to level the surface of the ground, the parts are arranged as shown in Fig. 3 and the scrap'er is drawn forward over the surface to be treated by power applied from the engine to the cables 3. The teeth 21 will, of course, take into the surface soil and cut oil the projecting portions of the same, and the soil thus cut off will accumulate thereon and against the back 2. Inasmuch as the cable 9 is connected with the cables 3, the application of power to haul the scraper forward will draw the cable 9 to the position shown in Fig. 3 thereby lifting the apron or runner plate about its pivotal connection with the side plates to a position in rear of the back 2. After the load has been discharged or the scraper has reached the end of its prescribed travel. a

pull is exerted upon the cables ll'which will cause the apron to swing downwardly and forwardly,,the edge of the same striking the to return to the position shown in Fig. 2

under the influence of gravity. It will be understood, of course, that the cables 3 and 9 are, slack when a'pull is exerted on the cables-11 and that the continuance of the pull through the latter cables will draw the scraper rearwardly over the ground. *Ingits rearward movement, the scraper will ride on the apron and the back plate and teeth will be out of contact with the ground so that they will not be subjected to any wear.

My device may be applied to any scraper at a slight cost and will greatly prolong the life of the same. 1

Having thus described the invention, What is claimed as new is 1. The combination with a scraper, of brackets secured to the sides thereof and offset therefrom, a runner plate, standards at the ends of the runner plate intermediate the front and rear edges of the same and having their upper ends disposed between the sides of the scraper and the offset brackets, pivots inserted through said brackets and the upper ends of the standards into a draft cable connected to the front end of the scraper, a cable secured to and extending rearwardlv from the runner plate, and

a second cable secured to the runner plate and passing upwardly therefrom and forwardly over the said pulley and secured to the draft cable.

2. The combination with a scraper, ofa runner plate, standards rising from the ends of the runner plate intermediate the front and rear edges thereof and having their upper ends pivoted to the sides of the scraper, and means for moving the runner plate to a position in rear of the scraper or to a position under the rear end of the same.

In testimony whereof I aflix my signature. Y JOHN SHOSTROM. [L.s.]

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