Patent ID: 6612782
Filing Date: 2003-09-02
Classification: A62B,E02D

Abstract:
A telescoping tube for supporting surrounding walls of a shaft, the shaft having a top opening and a bottom surface, comprising:a plurality of nested telescoping successive sections to be positioned in the shaft, each section having a bore defining an inner wall and an outer wall, a top edge, a bottom edge and a middle portion extending therebetween, each section further having a lower ledge extending inward just above the bottom rim, the bottom rim of one of the sections engaging the top lip of the successive section in order to prevent separation of the sections from each other; a top lip extending outward from the top edge of each section, the top lip comprises a pair of top lips, said lips extending outward from the outer wall at opposite quadrants along the top edge, wherein a preceding section has a lower ledge extending inward from the inner wall just above the bottom rim, such that another section may be selectively rotated so that one of the top lips is sandwiched between the bottom rim of the preceding section and the lower edge of the preceding section; and a bottom rim extending inward from the bottom edge of each section, the bottom rim of one of the sections selectively engaging the top lip of the successive section to prevent separation of the sections from each other.