Road structure – process – or apparatus – Pavement – Vault cover-closure
Patent
1994-05-31
1996-10-15
Buiz, Michael Powell
Road structure, process, or apparatus
Pavement
Vault cover-closure
52 21, E02D 2914
Patent
active
055648550
ABSTRACT:
A stackable height adjustment ring for supporting a manhole cover frame upon a concrete manhole shaft liner has a ring body that is formed from plastic resin, e.g., scrap plastic. The ring includes inner and outer radially spaced apart side walls and optionally a top wall. Brace arms which are integral with the walls preferably extend radially between the walls for holding them together. The rings have alignment members, e.g., an inner wall of the ring can have an upwardly facing shoulder upon its upper edge and the outer wall, a downwardly facing shoulder on its lower edge. An upwardly extending cylindrical collar at the top of the outer ring fits the downwardly facing shoulder of an adjacent ring. There is also a downwardly extending collar at the lower edge of the inner ring to fit on the upwardly facing shoulder of a similar inner ring. The alignment members enable each ring to be held in alignment upon each successive ring beneath it so that the rings can be stacked one upon another to adjust the elevation of the manhole cover frame above a concrete manhole shaft liner. Optionally, the rings have engageable ramps for adjusting the pitch of an upper one of two stacked rings.
REFERENCES:
patent: 3773428 (1973-11-01), Bowman
patent: 4121390 (1978-10-01), Hall et al.
patent: 4759656 (1988-07-01), Wilson
patent: 4763449 (1988-08-01), Vigneron et al.
patent: 4772154 (1988-09-01), Caroulle
patent: 5209601 (1993-05-01), Odill et al.
patent: 5211504 (1993-05-01), Tudel
patent: 5221155 (1993-06-01), Neil
Buiz Michael Powell
Harmon James V.
National Polymers Inc
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