Apparatus for pipe-to-manhole sealing

Details Apparatus for pipe-to-manhole sealing Apparatus for pipe-to-manhole sealing

1975-09-25

1977-03-01

Purser, Ernest R.

Static structures (e.g., buildings)

Combined

52 20, 52749, 173 32, 248 17, 408 88, 408103, E21C 1100

Patent

active

040095452

ABSTRACT:
A pre-cast, reinforced concrete manhole riser is provided with a precisely aligned porthole for a sewer pipe, by cutting the hole on the site, the resulting smooth-faced, unobstructed porthole being sealed by a flexible collar having one end clamped on the pipe and having a flange at the other end adhered to the riser around the cut hole. Apparatus for cutting the hole, on the site, clamps on the upper rim of the riser, there being a cutter and carriage which move relative to a clamped frame.

REFERENCES:
patent: 456918 (1891-07-01), Tetlow
patent: 1395194 (1921-10-01), Lindhe
patent: 2730334 (1956-01-01), Sullivan
patent: 3234977 (1966-02-01), Byers
patent: 3412813 (1968-11-01), Johnson
patent: 3448477 (1969-06-01), Ricordeau et al.
patent: 3586079 (1971-06-01), Collins et al.
patent: 3696874 (1971-03-01), Brinkman
patent: 3741671 (1973-06-01), Douglass

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