Composite multi-pressure gasket
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 7, 2000
Grant Date -
N/A
app pub date -
Apr 15, 1999
filing date -
Apr 15, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A composite gasket for forming a seal between a pipe bell and a spigot comprises a first axially disposed portion formed of an elastomeric material and has a first leading edge and a first trailing edge, and a second axially disposed portion, adjacent the first axially disposed portion, formed of a generally non-elastomeric substantially rigid plastic, which comprises multiple, axially extending, laterally spaced apart, ramp-like projections separated by circumferential valleys, which expose elastomeric material. Fluid entering the valleys during a high pressure surge force the composite gasket into a tighter seal.
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