| 摘要 |
1472069 Shovelling machines HY-MAC Ltd 11 March 1975 [12 March 1974] 10876/74 Heading E1F In a hydraulically operated shovelling machine in which a bucket 3 is mounted at one end of a bucket arm 5 pivoted at the other end on a shorter main arm 7 pivoted at 8 on the chassis of the machine a luffing ram(s) 9 and a lifting ram(s) 11 are so associated with the arms by being connected to the bucket arm 3 and in the case of the ram(s) 11 to the chassis that the ram(s) 11 cannot lie in the same straight line as the part of the bucket arm 5 between the pivot 6 and the point 10 and the bucket can be caused to describe a substantially straight line movement in a predetermined direction under the influence of the ram(s) 9 whilst the lifting ram(s) 11 is or are maintained at a constant length. The geometry of the arms 5, 7 together with the mountings 13, 12 of the lifting ram(s) 11 on the chassis 1 and the arm 3 can be so arranged that the bucket can be caused to describe under the influence of the luffing ram(s) 9 alone different substantially straight line movements with different extensions of the lifting ram(s) 11. The directions of the straight line movements may be parallel to the ground on which the machine stands, may be parallel to each other, may be vertical or horizontal, or may radiate from a common point at ground level beneath the chassis. The outer terminal movement of the bucket can be such that it tends to rise slightly above the straight line along which it has been moved for the majority of its forward travel. Linkage 14, 15, 18, 20, 22 disposed above the arms 5, 7 and co-operating therewith ensure of the bucket being maintained at a constant attitude as the arms 5, 7 move relative to the chassis. Safety means are provided on the machine for inhibiting movements of the arms under the influence of the rams if such movements could lead to damage to parts of the machine.
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