E - Fixed Constructions – 02 – D
Patent
E - Fixed Constructions
02
D
E02D 29/14 (2006.01)
Patent
CA 2177096
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. Alternatively, the alignment member can be a vertically extending element such as a lug. 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.
Marks & Clerk
National Polymers Inc.
LandOfFree
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