| 摘要 |
A remotely controlled tri-level roller platform assembly including a base portion, an intermediate portion and a top support portion. The intermediate portion is reciprocally operable in a first linear plane, atop and independently of the base member, by means of a first reversible electric motor, with the top support portion disposed thereatop for movement therewith. The top support portion is reciprocally operable in a second linear plane, independent of the intermediate portion, at right angles to the first plane, by means of a second reversible electric motor. Remote control electric switches are provided for the first and second motors whereby the motors may be selectively operated for universal planar positioning of any desired point within a predetermined area of the top surface of the top support portion relative to the lens of a single camera in a visual aid system, including a TV monitor.
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