| 摘要 |
A camera support column comprises three tubular column sections (2, 3, 4) telescopically mounted on a base (1). The outermost upper column section (2) is supported on the base (1) by a set of three circumferentially spaced bearings (14) which are mounted on, and extend through the wall of the base (1). The intermediate column section (3) is supported by a similar set of three bearings (13) mounted on, and extending through the outer column section (2). Similarly, the inner column section (4) is supported on a set of three bearings (12) mounted on, and extending through the intermediate column section (3). The bearings of each set of bearings (12, 13, 14) are offset relative to the bearings of the other two sets. A pulley and cable arrangement (6, 7, 8, 9, 10, 11) is provided for elevating the outermost column section (2) relative to the base (1) and for interconnecting the three column sections (2, 3, 4) such that elevation of the outermost column section (2) causes the sections to expand telescopically. With this arrangement a very compact structure can be obtained as a spacing between adjacent column sections can be less than the radial depth of each bearing section. The number of column sections in the support columns can therefore be increased from the conventional two sections to three or more sections. |
