Lid assembly for facility access opening

Details Lid assembly for facility access opening Lid assembly for facility access opening

2005-10-11

2005-10-11

Hartmann, Gary S. (Department: 3671)

Road structure, process, or apparatus

Pavement

Vault cover-closure

C049S040000

Reexamination Certificate

active

06953301

ABSTRACT:
A cover assembly includes a support frame (20) fixed to a utility access hole and a rounded cover (10) fitted into the support frame. The support frame is provided in its upper portion with an S-curved inner peripheral surface (20b) having a convex curved surface portion (21) and a concave curved surface portion (22) that continues to the convex curved surface portion and is formed thereabove. The cover has an S-curved peripheral surface (10b) that is substantially complementary in shape to the S-curved inner peripheral surface of the support frame. When the access hole is closed by the cover, the cover is smoothly fitted into the support frame due to a guide function of the S-curved inner peripheral surface of the support frame.

REFERENCES:
patent: 149246 (1874-03-01), Price et al.
patent: 1600761 (1926-09-01), Haase
patent: 2190532 (1940-02-01), Lukomski
patent: 4614065 (1986-09-01), Papp
patent: 5052851 (1991-10-01), Frishauf
patent: 40-4350 (1940-02-01), None
patent: 57-46459 (1982-10-01), None
patent: 57-58296 (1982-12-01), None
patent: 3047851 (1998-02-01), None
patent: 3056877 (1998-12-01), None

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