| 摘要 |
An equapoised lamp comprising a lamp head mounted upon an arm assembly which is counterbalanced by springs enclosed within square tubes which are components of the arm assembly. The arm assembly has a lower pair of parallel arms which are pivoted at their lower ends to a swivel bracket which turns about a vertical axis in a fixed bracket. Each of those arms is pivoted at its upper end to a floating bracket which has pivoted to it a similar upper pair of parallel arms. A lamp assembly is mounted upon the other end of the upper pair of arms by a universal joint assembly. The arms are tubular, and each pair forms a parallelogram by virtue of the pivotal connections with the respective brackets. A coil spring is enclosed within one of each pair of tubes which exerts a counterbalancing effect upon its pair of arms. A nylon shoe is mounted upon the free end of each spring and enclosed within the tube. The shoe transmits the counterbalancing force from the spring to the adjacent bracket.
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