| 摘要 |
In a self-transportable aerial platform, an operator employs a handle for controlling the vertical, horizontal and lateral movements of the platform in order to place the basket or platform at a preferred location. The operator-controlled handle operates a linkage which actuates one valve of a control to produce a first mode of platform movement; the handle is movable in a second direction to displace separately and distinctly a second valve for a further mode of operation; and the handle can further be twisted or turned to effect a separate and distinct movement of a third valve for the final mode of platform movement. The linkage consists of parallelogram linkage having the capability that one of said links can serve as a pivot for the other link, both of said links can be pivoted in unison as part of a parallelogram linkage, and both links of the parallelogram linkage can serve as journals for twisting movement of the handle which effects the additional mode of platform movement.
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