Recoverable sleeve assembly

Details Recoverable sleeve assembly Recoverable sleeve assembly

1982-06-15

1983-10-18

Dixon, Jr., William R.

Pipes and tubular conduits

Combined

With end structure

138 99, 138141, 138178, 138103, 174DIG8, 428 36, F16L 900, F16L 5500

Patent

active

044100094

ABSTRACT:
A recoverable sleeve assembly is disclosed having an inner elastomeric tube and an outer rigid tube surrounding and secured to the inner tube holding the inner tube in outwardly stretched condition and wherein the outer tube extends axially beyond and covering at least one end of the inner tube and secured to that end of the inner tube. The end of the outer tube extending beyond the end of the inner tube has a thickness equal to the total thickness of the inner tube plus the thickness of that portion of the outer tube that surrounds the inner tube. The outer tube is a rigid thermosetting adhesive polyurethane comprising a polyester polyol reacted with an isocyanate whereby the outer tube is sufficiently adhesive to hold the inner tube in outwardly stretched condition but will peel from the inner tube upon impact of force or application of heat without need for a solvent. The polyester polyol is disclosed as trimethylol propane branched glycol adipate polyol or polycaprolactone polyol modified with 1,4 butanediol reacted with the isocyanate. The sleeve is applied around a substrate, and the outer tube is fractured by impact of force to allow the inner tube to shrink and the fragments of the outer tube to peel from the inner tube.

REFERENCES:
patent: 2725621 (1955-12-01), Gates
patent: 3243211 (1966-03-01), Wetmore
patent: 3515798 (1970-06-01), Sievert
patent: 3770876 (1973-11-01), Post
patent: 3824331 (1974-07-01), Mixon, Jr. et al.
patent: 4035534 (1977-07-01), Nyberg
patent: 4070746 (1978-01-01), Evans et al.
patent: 4135553 (1979-01-01), Evans et al.
patent: 4179320 (1979-12-01), Midgley et al.
patent: 4338970 (1982-07-01), Krackeler et al.
Bonk, "Polyurethane", Modern Plastics Encyclopedia 1975-1976, pp. 84-85.

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