| 摘要 |
PURPOSE: A hoist mechanism is provided for raising and lowering a platform within a tower and, more particularly and for being confined entirely within the interior of the tower structure. CONSTITUTION: A tower(10) is a three-sided latticework tower having three vertically oriented members(12,14,16) which are interconnected by a plurality of transverse braces(18). Although the tower 10 is shown as being triangular, other multi-sided towers can be utilized. The braces would interconnect adjacent ones of the vertically oriented members of the tower, so that the interior of the tower is open. A microcell(20) is secured between a top guide plate(22) and a middle guide plate(24), with the hoist mechanism being secured between the middle guide plate and a bottom guide plate(26). Each of the guide plates(22,24,26) is generally planar and polygonal with as many sides and vertices as there are vertically oriented members(12,14,16)of the tower(10). Each of the vertices of the plates is adjacent a respective vertically oriented member and a plurality of guide rollers(28) are each journalled for rotation to a respective guide plate vertex. Each of the guide rollers engages a respective vertically oriented member which is adjacent the respective vertex. A plurality of support members(29) hold the guide plates in parallel spaced relation a sufficient distance apart that the microcell can be installed therebetween. |
