초록 ▼

An improved fluid pressure activated piston return spring seal element is installed in a piston housing annular groove having first and second radial side walls, an axial base wall, and a mouth. The element is annular, formed of an elastomeric material, and has an axis, first and second radial faces

An improved fluid pressure activated piston return spring seal element is installed in a piston housing annular groove having first and second radial side walls, an axial base wall, and a mouth. The element is annular, formed of an elastomeric material, and has an axis, first and second radial faces, and an axial face. The first radial face faces toward the first side wall, defines an inwardly extending crotch region, and includes a base wall pressure sealing lip. The axial face faces toward and protrudes through the groove mouth and includes a piston pressure sealing lip and first and second angled surfaces. The element has a body portion, a first branch extending axially from the body portion toward the first radial face and having the piston pressure sealing lip, a second branch extending axially from the body portion toward the first radial face and having the base wall pressure sealing lip, and a third branch extending radially from the first branch end toward the second branch end and defining a portion of the first radial face. The body portion and the first, second, and third branches define the crotch region.

대표청구항 ▼

An improved fluid pressure activated piston return spring seal element for installation in a piston housing comprising an annular groove having in toroidal cross-section first and second generally parallel radial side walls, an axial base wall extending between the first and second side walls, and a

An improved fluid pressure activated piston return spring seal element for installation in a piston housing comprising an annular groove having in toroidal cross-section first and second generally parallel radial side walls, an axial base wall extending between the first and second side walls, and a mouth, the spring seal element being formed of an elastomeric material and having a generally annular shape, an axis, a radial face defining a pressure side of the seal element and for facing toward the first side wall of the groove, and an axial face for facing toward and partially protruding through the mouth of the groove, the seal element further having in toroidal cross-section: a body portion; a first branch extending generally axially from the body portion and having a distal end portion defining at least a portion of the radial face and the axial face, the first branch having a piston pressure sealing lip for extending outside the mouth of the groove and sealingly engaging a piston when the piston is positioned in the housing and across the mouth of the groove; a second branch extending generally axially from the body portion and having a distal end portion defining at least a portion of the radial face, the second branch having a base wall pressure sealing lip for sealingly engaging the base wall; and a third branch extending generally radially from the distal end portion of the first branch toward the distal end portion of the second branch, and defining at least a portion of the radial face, the body portion and the first, second, and third branches defining a crotch region extending inwardly with respect to the seal element from the radial face.