US2131421A - Scraper - Google Patents

Description

w. J; ADAMS Sept. 27, 1938.

)SGRAPER Filed March 23, 1936 INVENTOR W J.Ada,1n.s

ATTORNEY Patented Sept. 27, 1938 UNITED STATES PATENT OFFICE 2,131,421 scasraa William Joseph Adams, Santa Cruz, 'oaua, as-

signor to W. J. Adams, Inc., Stockton, Calif.,

a corporation Application March 23, 1938, Serial No. 70,218

the bottom plates of the bowls meet each other.

when the main bowl is raised to a carrying position.

In the previous scraper, the side plates of the auxiliary bowl, while extending rearwardly some distance from the rear edge of. the bottom plate thereof to overlap the sides of themain bowl, break upwardly from said bottom'plate. 'An open space above ground was thus-formed ahead of the main bowl between the overlapping plates. when working in light or sandy dirt this space allowed.

of the auxiliary bowl so that this dirt' escapespace is practically eliminated, thus positively confining all the dirt as scraped wltliinthe confines of the side plates. -At the same time, the

cost of construction of the scraper is increased but little if any.

I have also provided an improved form of cutting blade for the scraper, which prevents adhering of sticky dirt to the blade so that the bowl loads more easily and with less resistance when working in dirt of that character, and by eliminating the mound of dirt adhered to and built up across the blade, aids in the ready-and complete dumping of the load.

The above objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

.The figure on the drawing is a sectional elevation of my improved scraper, showing the auxiliary bowl as set for operating in light dirt and with the main bowl in a scraping position.

Referring now more particularly 'to the characters of reference on the-drawing, the scraper as before comprises a wheel supported frame which includes spaced side beams, one of which is shown at I. The main bowl B is disposedbetween the beams and is pivotally mounted at the bottom and rear end on a cross member 2 extending between the frame beams.

The side plates 3 of the, main bowl terminate in a plane adjacent the scraping blade 4 of said bowl. This avoids the wear on the forward portions of theside plates as when they extend forwardly from the blade some distance and must also dig into the ground, as is the case in some scrapers.

. The auxiliary bowl A is also disposed between the side frame beams, and is supported at its forward end from side beams for combined swivel and longitudinal movement relative thereto, by rollers 5 riding-on the beam tracks T substantially as in the previous device.

The side plates 3 of the main bowl B intermediate their ends are provided with substantially' vertical rows of bolt holes 6, while the side plates I of the auxiliary bowl A are provided with similar rows of holes 8. When the main bowl B and the auxiliary bowl A are in what may be termed closed position, i. e. when the co-operating edges of these bowls lie in substantially contacting relation, the rows of holes 8 are in register with the adjacent rows of holes 8. A bolt l0, provided for each side of the scraper, may be inserted in corresponding pairs of holes-to pivotally connect the overlapping plates together.

By moving these bolts ill from one set of holes to the other, the extent of the forward movement of the inner edge of the apron relative to the cutting edge of the bowl when the latter is tilted to scraping position, may be altered. When the bolts iii are in the topmost holes, the forward movement will be greatest and will be the least when the bolts are in the lowermost holes and intermediate movement may be had by placing the bolts in the intermediate holes. The greatest forward position has been found preferable when the scraper is operating in loose dry earth such as dry sandy soils. When the bowls are disposed in this relative position the inner edge of the bottom plate 9 of the auxiliary bowl A is considerably forward of the cutting edge of the main bowl B and above the ground.

In the structure of the former patent this left an objectionable opening between the bottom edge of the side plates 1 and thesround intermediate the edges of the main and auxiliary bowls. In scraping through loose dirt, therefore, a considerable portion of the scraped dirt would have the tendency to fiow out of these openings instead of moving into the bowl. This materially lessened the eillclency of the scraper.

To overcome this latter objection, I therefore of the plates of the two bowls; said lower edges being substantially parallel to the rear end portions of the top edges of said plates.

' In this manner, a closure with the ground and with the side plates 3 is provided immediately ahead of the plates 3 and blade 4; which prevents the escape of the dirt outwardly of and past the 4 sides-of the main bowl as such dirt is crowded up by the scraping action, as was previously the case. If the auxiliary bowl is lowered at its front end by adjustment of the supporting rollers 5,

the rear end of the bottom plate 9 will be close to the ground, and said dirt enclosing function I of the side plate extensions will be practically edges.

To facilitate the operation of the mechanism arranged as above described, I have also relocated the apron supporting rollers 5 from points near the forward end of the auxiliary bowl A, as shown in the patent, to points substantially midway between the ends of such auxiliary bowl as shown in the present drawing. This relocation of these rollers constitutes a vital improvement over the previous structure in that it changes the arc of the opening movement of the auxiliary apron and causes it to have' a much faster opening and closing action and to open much wider relative to the scraping edge of the main bowl when the latter is in scraping position, than-is the case when the rollers are located near the front end of the auxiliary bowl, as shown in the patent.

The blade 4 is concavely curved, and is supported and bolted on the similarly curvedface of a transversely extending cast shoe l2, which forms the base supportfor such scraping blade. This shoe or scraping blade support is disposed under and extends ahead of the bottom plate of the main bowl, being welded or otherwise rigidly secured thereto.

The upper edge of the blade is spaced ahead of the forward end of the bottom plate; the shoe at the top, between the blade and plate, being formed with a convex ridge l3 which extends above the level of the bottom plate. The forward side of the ridge merges into the forward surface of the blade as shown, so as to provide a smootlr surface for the movement of the dirt, and to form an abutment for the upper edge of the blade, relieving the holding bolts of the blade of shearing strains.

When a scraper is cutting through sticky soil the latter tends to move into the bowl in a solid column-like formation. Wherea flat scraping blade is used this sticky solid column tends to adhere to the face of the blade and the bottom of the bowl. necessary to force the column into the bowl. With the blade curved however, as disclosed in a this application, such curvature prevents the ad- This materially increases the power column being thus broken up, the dirt tends to 5 roll or flow into the bowl B more like loose earth does. The ease of loading sticky dirt is thereby increased, and the power necessary to load the scraper with such dirt is materially lessened.

From the foregoing description it will be read- 1 ily seen that I have produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described my invention what I Letters Patent is:

1. In a scraper, main and auxiliary bowls, the latter being in front of the former, the main claim as nw and useful and desire to secure by bowl including side plates and a scraping blade disposed adjacent the forward end of the side plates and the auxiliary bowl comprising a bottom plate and side plates projecting rearwardly there from and overlapping the side plates of the main bowl outwardly thereof, and means connecting the overlapping portions of the plates together so that when the blade is in digging position below ground level the rear end of the bottom plate is above ground level andspaced in front of the blade, the side plates of the auxiliary bowl being plates and the auxiliary bowl including a bottom plate and side plates outwardly overlapping the side plates of the main bowl, means pivotally connecting the overlapping side plates together above the bottom thereof in position to cause the rear'edge of the bottom plate to engage the blade when the bowls. are in transporting position, and means functioning with-the tilting of the main bowl to a digging position with the blade below ground level to cause the bottom plate to remain above ground level in an advanced position relative to the blade; the side plates of the auxiliary bowl being, formed to then extend rearwardly from the bottom plate adjacent ground level from a point adjacent and below the rear end of said bottom plate and a sufficient distance to 0 overlap the side plates of the main bowl adjacent round level.

3. In a. scraper, a tiltable main bowl, an auxiliary bowl in front of the main bowl, said main bowl including side plates and a scraper blade disposed adjacent the forward end of the side plates and the auxiliary bowl including a bottom plate and side plates outwardly overlapping the side plates of the main bowl, means pivotally connecting the overlapping side platestogether above the bottom thereof in position to cause the rear edge of the bottom plate to engage the blade when the bowls are in transporting position, and means functioning with the tilting of the main bowl to a digging position with the blade below round level to cause the bottom plate to remain above ground level in an advanced position relative to the blade; the side plates of the auxiliary bowl being formed so that the bottom edges thereof are then disposed on a level below the rear end of the bottom plate and extend adjacent ground level from a point some distance ahead of said end of the bottom plate to a termination rearwardly of the forward end of the side plates of the main bowl.

4. A scraper comprising tiltable main and auxiliary bowls, the latter being disposed in front of the former, the main bowl including side plates and a scraping blade disposed adjacent the forward ends of such side plates, the auxiliary bowl including a bottom plate the rear end of which is disposed above and some distance in front of the blade when the latter is in scraping position, and side plates on the auxiliary bowl pivotally mounted on the side plates of the main bowl and overlapping the outside of the same at substantially ground level when the main bowl is in scraping position and extending thence forwarda. scraping blade disposed adjacent the forward ends of such side plates, the auxiliary bowl including a bottom plate the rear end of which is disposed above and some distance in front of the blade when the latter is in scraping position, and side plates onsaid auxiliary bowl pivotally mounted to the side plates of the main bowl and overlapping the same at substantially ground level when the main bowl is in scraping position and extending thence forwardly at substantially said level to a point ahead of and belo the rear end of the bottom plate.

- 6. A scraper comprising tiltable main and auxiliary bowls, the latterbeing disposed in front of the former, the main bowl including side plates and a scraping blade disposed adjacent the forward ends of such side plates, the auxiliary bowl including a bottom plate the rear end of which is disposed above and some distance in front of the blade when the latter is in scraping position, and side plates on the auxiliary bowl overlapping the outside of the side plates of the main bowl at substantially ground level when the main bowl is in scraping position and extending thence forwardly at substantially said level to a point ahead of and below the rear end of the bottom plate.

WILLIAM JOSEPH ADAMS.

Images