| 摘要 |
An excavator with articulated arms has a self propelled truck which rotatably supports a platform. The first arm is articulated by a lateral pivot pin near a peripheral edge of the platform, its pivotal movement about the lateral pivot pin being controlled by a jack itself articulated at one end to the platform near the lateral pivot pin. The opposite end of the jack is articulated to one end of each of a pair of levers, the outer end of one lever being articulated by a common pivot to a central portion of the first arm while the outer end of the second lever is articulated to the platform near the lateral pivot pin. When the platform is substantially horizontal and the first arm is fully raised, the vertical projections of both levers lie within the platform. At the free end of the first arm is articulated one end of the second arm, an excavating member such as a bucket scoop being articulated to the opposite end of the second arm.
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