초록 ▼

A folded annular gasket is cast into an opening in the wall of a manhole and held in a compressed state by an annular support. The annular support includes a helical strip which can be stripped apart to remove the annular support from within the annular folded gasket. A pipe to be connected to the m

A folded annular gasket is cast into an opening in the wall of a manhole and held in a compressed state by an annular support. The annular support includes a helical strip which can be stripped apart to remove the annular support from within the annular folded gasket. A pipe to be connected to the manhole is inserted into the annular support. After the pipe is inserted in the annular support, the annular support is stripped out from between the folded annular gasket and the pipe. Removal of the annular support causes the folded annular gasket to press against the pipe and thereby form a seal. Removal of the annular support can also cause the folded annular gasket to invert. The inverted part of the annular gasket can be clamped to the pipe and function as a boot or sleeve.

대표청구항 ▼

[ What is claimed is:] [1.] In combination, an annular gasket assembly, a pipe having an outer surface, and a wall defining an opening, comprising:a gasket, including:an annular base,a projection for anchoring the base within a wall defining an opening so that the base lies adjacent the wall,an annu

[ What is claimed is:] [1.] In combination, an annular gasket assembly, a pipe having an outer surface, and a wall defining an opening, comprising:a gasket, including:an annular base,a projection for anchoring the base within a wall defining an opening so that the base lies adjacent the wall,an annular first web, andan annular second web intermediate the base and the first web, the first web being coupled to the second web and the second web being coupled to the base so that the first and second webs are movable between a folded position adjacent one another and an unfolded position in which the first and second webs form a sleeve around an outer surface of the pipe; andan annular support, the annular support being positioned within the annular gasket and compressing the annular gasket radially outward, the annular support comprising a helical strip which can be stripped apart to remove the annular support from within the annular gasket.