Back-up means for fluid cylinder and method for using same

Details Back-up means for fluid cylinder and method for using same Back-up means for fluid cylinder and method for using same

1985-12-12

1987-06-23

Shoap, Allan N.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 70, 277188A, 277201, F16J 900, F16J 1516, F16J 1524

Patent

active

046747540

ABSTRACT:
The back-up rings of the present invention are seated on opposite sides of a sealing ring within an annular groove of a hydraulic piston. The sealing ring is in frictional engagement with the interior surface of the hydraulic cylinder, and the back-up rings are positioned within the cylinder groove and on opposite sides of the sealing ring. At least one of the back-up rings includes a vent hole extending axially therethrough to permit the alleviation of any fluid pressure accumulating between the two spaced apart back-up rings. As an alternative to the axial vent hole, a groove may be provided on the interior perimeter of the back-up ring or the back-up ring may include a complete break therein for permitting the venting of fluid trapped between the two back-up rings. The method of the present invention includes venting any fluid which is trapped between the two back-up rings during reciprocation of the piston within the cylinder.

REFERENCES:
patent: 2456356 (1948-12-01), Aber
patent: 2520306 (1950-08-01), Detweiler
patent: 2727471 (1955-12-01), Martin
patent: 2728620 (1955-12-01), Krueger
patent: 3171334 (1965-03-01), Rasmussen

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