| 摘要 |
An earth moving scraper comprising an open, rectangular frame supported at its rear end by wheels and having a tongue at its front end for connection with a tractor. A bucket having a blade across the lower edge of its open front end is pivotally mounted on the frame for swinging between a generally horizontal, loading position and a generally vertical, unloading position. The sides of the frame are hinged intermediate their ends to permit the bucket to be raised above the surface of the soil upon breaking of the hinge. A reciprocating actuator is connected between the bucket and the frame for swinging the bucket between horizontal and vertical positions, and another reciprocating actuator connects the sides of the frame on opposite sides of the hinge for selectively breaking it to raise the bucket and blade above loading position. In one embodiment of the scraper, the opening into the bucket is adapted to be closed by a gate while, in another embodiment, this opening is adapted to be partially closed by an apron. Each of the gate and apron are swung between open and flow restricting positions by means of still another reciprocating actuator connected between it and the frame. Hydraulic systems for operating the actuators include means which prevent these components from moving between their alternative positions in other than a desired sequence.
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