Segmented adjustment riser
AssigneeNational Rubber Technology Inc.
InventorGregory F. Bavington
Life of this patent
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Abstract
A segmented adjustment riser for maintenance holes has a plurality of similar elongated one-piece segments. Each segment has two opposite ends provided with respective interengaging formations, and the segments are placed together end to end to form an endless riser member having planar upper and lower sides. The formations interengage and resist lateral displacement of each end of each segment relative to the adjacent end of each adjacent segment. The segments can be manufactured relatively easily and with greater economy than the corresponding one-piece riser member and facilitate handling and installation.
Claims12
In a supporting structure for supporting a maintenance hole frame, an underground vault structure defining an endless planar upper face, an endless adjustment riser member supported on said vault structure and having a planar lower side for bearing on the said upper face, and having a planar upper side, and a maintenance hole frame supported on said adjustment riser member and having a base flange defining a planar lower face for bearing on said planar upper side of said riser mender, wherein the improvement comprises said adjustment riser member comprising a segmented member comprising a plurality of similar elongated one-piece segments, each molded from resilient polymeric material, and each having two opposite ends provided with respective interengaging formations, and placed together end to end to form an endless riser member having planar upper and lower sides, said formations interengaging and resisting lateral and longitudinal displacement of each end of each segment relative to the adjacent end of each adjacent segment.
Dependencies are inferred from the claim text.