| 摘要 |
<p>A base support for a tripod tower structure (12,14,16) includes a concrete slab, a pair of brackets (36,38) anchored to the slab, and a unitary, Y-shaped member (40) pivotally attached at the extremities of two of its arm to the anchored brackets along a common axis. Mountings (60,62) for each of the three legs (12,14,16) of the tower are provided at equally spaced positions on the three arms of the Y-shaped member (40). The tower is normally held upright by a stud (34) partially embedded in the slab and passing through a hole (76) in the third arm of the Y where it carries a nut. Removal of the nut allows the tower to pivot down to a near horizontal position to provide access to top of the tower.</p> |
