Spring seal
First Claim
Patent Images
1. A seal assembly comprising:
- (a) an annular sealing ring of resilient deformable plastic material and a mating back-up ring,(b) said sealing ring having a radially disposed side face defining the pressure side of the assembly, said sealing ring having its inner peripheral surface defined by three contiguous portions, the first portion converging toward said side face with a taper of between 3° and
10°
with respect to the axis of the sealing ring, the second portion being an angled surface extending outwardly from said first portion at an angle of between 20° and
40°
with respect to a radius on said sealing ring, said third portion being an axially extending flange adjacent the outer periphery of said sealing ring,(c) said back-up ring being disposed radially inwardly of said third portion and having radially disposed side faces, one side face of said back-up ring cooperating with said second portion to define a generally triangular shaped space on the inner periphery of said assembly with the apex of the triangular shaped space extending radially outwardly.
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Accused Products
Abstract
A sealing ring firmly grips a movable piston, performs the normal sealing function, and when pressure is released on the piston the sealing ring pulls back on the piston so as to retract the piston. The sealing ring is designed so as to fit in a conventional seal or "O" ring groove without any modification of the groove.
14 Citations
4 Claims
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1. A seal assembly comprising:
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(a) an annular sealing ring of resilient deformable plastic material and a mating back-up ring, (b) said sealing ring having a radially disposed side face defining the pressure side of the assembly, said sealing ring having its inner peripheral surface defined by three contiguous portions, the first portion converging toward said side face with a taper of between 3° and
10°
with respect to the axis of the sealing ring, the second portion being an angled surface extending outwardly from said first portion at an angle of between 20° and
40°
with respect to a radius on said sealing ring, said third portion being an axially extending flange adjacent the outer periphery of said sealing ring,(c) said back-up ring being disposed radially inwardly of said third portion and having radially disposed side faces, one side face of said back-up ring cooperating with said second portion to define a generally triangular shaped space on the inner periphery of said assembly with the apex of the triangular shaped space extending radially outwardly. - View Dependent Claims (2, 3, 4)
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Specification