| 摘要 |
A bolster hoist for a dump vehicle comprising a first support pivotally secured to the vehicle frame and having first and second arms extending rearwardly therefrom. Third and fourth arms are pivotally secured at their rearward ends to the rearward ends of the first and second arms and are secured at their forward ends to a second support pivotally secured to the dump body. First and second links are pivotally secured at their upper ends to the first and second arms at the forward ends thereof respectively and have the forward ends of first and second bars pivotally secured at their lower ends. First and second levers are pivotally secured at their lower ends to the rearward ends of the first and second bars and are pivotally connected intermediate their ends to the pivotal connection of the first, third and second, fourth arms. A hydraulic cylinder is pivotally connected at its base end to the first and second links intermediate the ends thereof and is pivotally connected at its rod end to the upper rearward ends of the third and fourth arms. A cross bar extends between the rearward ends of the third and fourth arms and is engaged by the upper ends of the first and second levers during the initial extension of the rod from the cylinder to increase the leverage applied to the third and fourth arms.
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