| 摘要 |
<p>The extensible support pole unit having a simple structure including a plurality of shaped members, e.g., cylindrical bodies, band-like plates having, e.g., an arched cross-sectional shape, a band-like plate feed mechanism, and a driving device. The support pole is extended to stand or retracted by only paying out or winding up the band-like plates. The support pole can therefore be extended to a length freely selected, and it is possible to freely set a large extension ratio by selecting the length of each cylindrical body and the number of cylindrical bodies. The band-like plates have, for example, an arched cross-sectional shape and have properties such as to be strong against the vertical load as compared with flat plates. The band-like plates are retained in the guide slits or guide holes formed in the partition members disposed in the cylindrical bodies to further improving the above properties. With respect to the lateral load, the material, the diameter, the thickness of each cylindrical body, and the area of the connection portion of each cylindrical body are selected to maintain a sufficient strength. The influence of the lateral load upon the band-like plates is therefore negligible.</p> |
