US 5,363,744 A · Accumulator piston having multiple elastomeric seals

Abstract

An accumulator piston is formed as a two-piece plastic molding for simplifying its construction and for cost reduction and weight reduction purposes. The piston has a radially stepped construction in which each step includes a radial flange carrying an annular elastomeric sealing element. The sealing elements have deformable, resilient lips which slidably engage the side surfaces of a stepped cylinder in which the piston reciprocates. One of the elastomeric sealing elements is molded to an annular insert member that is seated in an annular recess formed in one end of the main piston body. The two-piece piston construction facilitates installation and removal of mold cavity members relative to the respective elastomeric sealing elements such that the mold cavity members can be of simplified economical construction.

Claims9

Dependent claims

An accumulator piston, comprising:

a molded, rigid plastic body that includes a tubular body portion centered on a central axis, said tubular body portion having first and second ends, a first flange extending radially outwardly from said tubular body portion near said first end, an annular recess formed in said second end, and a partition transversely spanning the tubular body portion at an intermediate point between said first and second ends;
a molded, rigid, annular plastic insert comprising an axial section seated in said annular recess, and a second flange extending radially outwardly from said axial section;
a first annular elastomeric seal mounted on said first flange;
and
a second annular elastomeric seal mounted on said second flange.

2 more elements

Dependencies are inferred from the claim text.

Accumulator piston having multiple elastomeric seals

Life of this patent

Accumulator piston having multiple elastomeric seals

Life of this patent

Abstract

Claims9