| 摘要 |
PURPOSE: A point lifter is provided to move a lighter upward and downward by lifting the light using an extension pipe. CONSTITUTION: A point lift includes a plurality of extension pipes(302), a linear guide, and a motor(303). Each of the extension pipes is composed of multiple parts having different diameters so that the extension pipe is extended or shortened. A point light(301) is set at the lowest part(302a) of each of the extension pipes. The linear guide is placed on at least one of the inner and outer faces of each extension pipe to move the extension pipe while reducing a movement error of the extension pipe. The motor operates a pulley(304) set on the top of each extension pipe to pull the extension pipe upward using a rope(302b) to shorten the extension pipe. The pulley is constructed in a manner that spiral rope holes, opposite to each other, are formed at the pulley.
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