Hydraulically operated shovels
AssigneeHy-Mac Limited
InventorAnthony Clubley Armstrong
Life of this patent
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Abstract
A power shovel is described in which the bucket describes a straight line loading movement under power from the luffing rams alone, different straight line movements being obtained by adjustment of the length of the lifting rams which form one side of a deformable quadrilateral. The movements may be level, sloping or vertical. The main arm is shorter than the backet arm so that the loading movements can start close to the chassis of the shovel and the quadrilateral is not deformed into a triangle. A parallelogram linkage for controlling the attitude of the bucket extends from the chassis so that changes in position of the main and bucket arms do not influence the attitude of the bucket.
Claims12
A hydraulically operated shovel having a bucket mounted at one end of a bucket arm, the other end of which is pivotally mounted on a main arm shorter than the bucket arm, the main arm being mounted on a pivot on a chassis member, a luffing ram or rams acting on the bucket arm, and a lifting ram or rams acting between an intermediate point on the bucket arm and a point on the chassis member spaced from the mounting point thereon of the main arm in such a way that the lifting ram or rams cannot lie in the same straight line as the part of the bucket arm between the pivot of the bucket arm on the main arm and the intermediate point, and also that the bucket can be caused to describe a substantiallyl straight line movement in a predetermined direction under the influence of the luffing ram or rams with the lifting ram or rams maintained at a constant length.
Dependencies are inferred from the claim text.