Road manhole

Details Road manhole Road manhole

2007-12-12

2009-02-17

Addie, Raymond W (Department: 3671)

Road structure, process, or apparatus

Pavement

Vault cover-closure

C052S019000, C052S020000

Reexamination Certificate

active

07491010

ABSTRACT:
This road manhole comprises a frame (4) which delimits an opening (6) and which is provided with an internal collar (8) which extends radially inwards, a cover (10) which comprises a blocking web (12) and a cylindrical skirt (14) which complements the internal collar (8), the blocking web and the skirt defining a concave corner (16), and a main gasket (18) which is arranged on the internal collar (8) and which is interposed in the closed state between the cover (10) and the frame (4).The road manhole (2) comprises an auxiliary gasket (20) which is in contact, at least in the closed state, with the concave corner (16).

REFERENCES:
patent: 3308727 (1967-03-01), Hurt, Jr.
patent: 3920347 (1975-11-01), Sauriol et al.
patent: 4101236 (1978-07-01), Meyer
patent: 4187647 (1980-02-01), Hall
patent: 4203190 (1980-05-01), Temple et al.
patent: 4440407 (1984-04-01), Gagas
patent: 4608787 (1986-09-01), Carlson
patent: 4706718 (1987-11-01), Milo
patent: 4834574 (1989-05-01), Bowman
patent: 5021261 (1991-06-01), Bowman
patent: 5100257 (1992-03-01), Centa
patent: 6435764 (2002-08-01), McNeely
patent: 1 452 648 (2004-09-01), None
patent: 2 153 823 (1973-05-01), None
patent: 2 780 997 (2000-01-01), None

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