| 摘要 |
The present invention is a gravel screening device for separating different sizes of gravel and stones or separating gravel and stones from larger rocks. The device comprises a screen supported by a frame with two side walls connected by a low front wall. The screen and the upper edge of each side wall slope downward toward the low front wall. The frame is approximately 10 to 12 feet in width, about 8 feet deep, and supported about 8 feet high by the side walls in the back sloping toward the front wall which is about 4 feet high. The back is open and the edges of the side walls slope outward from the tops of the sidewalls to their bases, thus accommodating a maximum amount of gravel taking into account the angle of repose of the gravel collected in the device.
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