Sleeve assembly for forming openings in molded structures
First Claim
1. A sleeve assembly for forming a lined opening in a molded structure comprising,a tubular sleeve apparatus comprising a plurality of concentric sleeves,a pair of sleeve positioning elements,each of said sleeve positioning elements having a surface for selectively bearing against a respective end of said tubular sleeve apparatus,a resilient retainer means extending axially through said concentric sleeves, andsecuring means attached to said resilient retainer means for selectively securing said sleeve positioning elements against the ends of said tubular sleeve apparatus.
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Accused Products
Abstract
A sleeve assembly for forming a lined opening in molded structures made from concrete or the like. The sleeve provides the lining. During formation of the structure, the sleeve is held in place by a pair of generally hemispherical end cups having tapering and/or curving surfaces for supporting sleeves of a variety of sizes. The end cups are preferably held in place by a retainer which passes through the sleeve and is connected to the end cups by loose fitting clips which are mounted in the end cups. The sleeve assembly is adapted to be secured between a pair of generally parallel panels between which a molded structure such as a wall is formed.
34 Citations
13 Claims
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1. A sleeve assembly for forming a lined opening in a molded structure comprising,
a tubular sleeve apparatus comprising a plurality of concentric sleeves, a pair of sleeve positioning elements, each of said sleeve positioning elements having a surface for selectively bearing against a respective end of said tubular sleeve apparatus, a resilient retainer means extending axially through said concentric sleeves, and securing means attached to said resilient retainer means for selectively securing said sleeve positioning elements against the ends of said tubular sleeve apparatus.
Specification