Means for blocking flow of material from scraper bowl

Elevating scrapers are useful for loading material into a bowl and transporting the material to a location for dumping. When the elevator loads material into the bowl, a portion tends to slide forward between the side walls and the elevator and out of the bowl. The subject arrangement provides a blocking plate attached to the side wall which extends toward the elevator. The blocking plate blocks the reverse flow of material between the side wall and the elevator. This arrangement of components reduces the amount of time needed to load the material into the bowl.

TECHNICAL FIELD 
This invention relates generally to a scraper having an elevator for 
loading material rearwardly and upwardly into a bowl and more particularly 
to a means for blocking the reverse flow of the material out of the bowl 
between the elevator and the bowl side. 
BACKGROUND ART 
Elevating scrapers are used to remove and transport large volumes of 
material from one location to another. A cutting edge in the scraper bowl 
is pulled through the material to loosen the material, and a powered 
elevator carries the material away from the cutting edge rearwardly and 
upwardly into the bowl. One of the problems associated with the elevator 
loading the material into the bowl is that a pile of material will develop 
behind the elevator in the bowl. As the elevator continues to move 
material rearwardly and upwardly onto and over the pile, a portion of the 
material will move or slide forwardly from the pile through an opening 
between the bowl side and the elevator frame, and will fall out of the 
bowl. This movement of material out of the bowl will increase the loading 
time of the scraper. 
The present invention is directed to overcoming one or more of the problems 
as set forth above. 
DISCLOSURE OF THE INVENTION 
In one aspect of an earthworking scraper of the present invention, a frame 
pivotally carries a material receiving bowl. The bowl has two generally 
vertical spaced parallel side walls and a cutting edge attached between 
the side walls at the forward opening of the bowl. An elevator is 
positioned at the forward opening of the bowl above the cutting edge and 
between the spaced side wall. A pair of elevator linkage members attach 
the elevator to the side walls. Means is provided for blocking reverse 
flow of material from the bowl between the side wall and the elevator 
The present invention provides an earthworking scraper arrangement which 
blocks the reverse flow of material from the bowl between the side wall 
and the elevator. The arrangement includes a plate attached to the bowl 
side which extends toward the elevator to block the flow of material out 
of the bowl.

BEST MODE FOR CARRYING OUT THE INVENTION 
Referring to FIG. 1, a scraper is generally indicated by reference number 
10. The scraper includes a tractor 12 and a material receiving bowl 14. 
The tractor 12 includes a pair of ground engaging wheels 16, a frame 18, 
and a pair of spaced rearwardly projecting draft arms 20 which pivotally 
support the bowl 14 relative to the tractor 12. The bowl 14 has a pair of 
ground engaging wheels 22 which support the bowl 14. A pair of hydraulic 
cylinders 24 which are attached between the frame 18 and the bowl 14 
vertically move the bowl 14 to pivot around a pair of pins 26 which attach 
the draft arms 20 to the bowl 14. The bowl 14 includes a pair of spaced 
parallel side walls 28, a moveable floor 30 for ejecting material, a rear 
wall 32, and a cutting edge 34 positioned and attached between the side 
walls 28 at the forward opening of the bowl 14. As shown in FIG. 3, an 
elevator 36 is positioned between the side walls 14 at the forward opening 
of the bowl 14. The elevator 36 carries material from the cutting edge 34 
rearwardly and upwardly into the bowl 14. The elevator 36 includes a 
vertical frame 37 attached to each side wall 28 by a support linkage 38 A 
motor 40 with a drive sprocket 42 is attached to the upper end of the 
frame 36. A guide wheel 44 is attached to the lower end of the frame 36. 
An endless chain 46 is positioned around the sprocket 42 and the guide 
wheel 44. Flights 47 for carrying material into the bowl 14 are mounted 
along the chain 46 at essentially equally spaced intervals. 
A blocking plate 48 is attached to each of the side walls 28 of the bowl 
14. The plate 48 has a central portion 50, a first end portion 52 
extending toward the cutting edge 34 perpendicular to the central portion 
50, and a second end portion 54 extending toward the cutting edge 34 
perpendicular to the central portion 50. The blocking plate 48 has a side 
56 which is attached, by any suitable means such as welding, to the side 
wall 28, and extends therefrom toward the elevator 30. A distal portion 58 
ends in close proximity to the elevator 30. The central portion 50 of the 
blocking plate 48 is approximately twenty-four inches in length and 
approximately ten inches in width. The first and second end portions 52,54 
are each approximately six inches in length and form triangular section. 
When attached to the bowl wall 28 the first end portion 52 is parallel and 
aligned with the elevator frame 37 and extends perpendicular therefrom 
into the material receiving bowl. 
Industrial Applicability 
In use of the scraper 10 of the present invention, the hydraulic cylinders 
24 are extended to pivot the bowl 14 around the pins 26 to engage the 
cutting edge 34 with material to be loaded. As the scraper 10 is pulled 
forward, the cutting edge 34 will cut material and move it upwardly toward 
the bowl 14. The elevator motor 40 rotates the chain 46 and flights 47 to 
move the material from the cutting edge 34 upwardly into the bowl 14. As 
material is moved upwardly into the bowl 14, a mound of material will form 
behind the elevator 36. As more material is deposited onto the mound a 
portion of the material will tend to slide forward toward the spaces 
between the side walls 28 and the elevator 36. The blocking plate 48 is 
mounted to the side wall 28 and extends toward the elevator 36, thus 
blocking the forward flow of material out of the bowl 14. 
In view of the foregoing, it is readily apparent that the structure of the 
present invention provides a blocking plate which blocks the reverse flow 
of material from the bowl between the side walls and the elevator, thus 
reducing the amount of time needed to load the bowl. 
Other aspects, objects and advantages of this invention can be obtained 
from a study of the drawings, the disclosure and the appended claims.