Adjustment riser for a manhole frame

Details Adjustment riser for a manhole frame Adjustment riser for a manhole frame

2005-10-11

2005-10-11

Will, Thomas B. (Department: 3671)

Road structure, process, or apparatus

Pavement

Vault cover-closure

C052S020000

Reexamination Certificate

active

06953302

ABSTRACT:
An adjustment riser is disposed between a manhole and a frame embedded in the paved surface of a roadway. The adjustment riser includes an annular concrete base which includes substantially flat top and bottom surfaces. A ridge and a groove are formed on the top and bottom surfaces, respectively, of the base to facilitate in the stacking of multiple risers and to prevent water infiltration. The adjustment riser additionally includes a plurality of adjustable support assemblies for supporting the frame. Each support assembly includes a support which extends axially within a corresponding bore formed in the base. Each support includes an enlarged head shaped to support the frame, the vertical position of the head of the support relative to the top surface of the base being continuously adjustable. In this manner, the adjustable nature of each support enables riser to hold the frame in its proper orientation relative to the paved surface.

REFERENCES:
patent: 3773428 (1973-11-01), Bowman
patent: 3858998 (1975-01-01), Larsson et al.
patent: 4149816 (1979-04-01), Piso
patent: 4925337 (1990-05-01), Spiess et al.
patent: 5513926 (1996-05-01), Prescott
patent: 5723192 (1998-03-01), Jonasz
patent: 6371687 (2002-04-01), Heintz et al.
patent: 6811350 (2004-11-01), Nadasde
patent: 62021933 (1987-01-01), None

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