| 摘要 |
IMPROVED MANHOLE CASTING POSITIONING APPARATUS AND METHOD The present invention provides an improvement in manhole casting positioning apparatus. In particular there is provided a casting positioning apparatus, for positioning a casting in relation to an upper end of a manhole, which comprises an inner sleeve comprising an elongated planar piece of flexible material provided at either end thereof with a plurality of holes and adapted to form a cylinder having open upper and lower ends, the diameter of said cylinder being variable between a retracted position in which the lower end of the cylinder can freely enter the upper end of the manhole, and an expanded position in which the upper end of the cylinder can support the casting in a position mounted thereon, and in which an engaging section of the lower end of the cylinder can frictionally engage against the inside of the upper end of the manhole, with sufficient force so that the cylinder and the mounted casting can be supported by such engagement, while simultaneously allowing the upper end of the cylinder to be moved with respect to the upper end of the manhole to position the mounted casting with respect thereto; and removable inner sleeve adjusting means for retaining the inner sleeve unit in said cylindrical form, the adjusting means comprising a turnbuckle having a pair of threaded shanks having eyes secured to the ends thereof and a central body for threadedly receiving said shanks, said eyes meeting said shanks at an angle less than 180 degrees, and means adapted to extend through said holes for releasably securing said eyes to said inner sleeve. |
