The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 26, 1991
Filed:
Jul. 27, 1989
Kouji Nakamura, Yokohama, JP;
Mamoru Akeda, Yokohama, JP;
NHK Spring Co., Ltd., Yokohama, JP;
Abstract
An accumulator comprises a housing and a rod. The housing is sealed by means of high- and low-pressure sealing devices. The high-pressure sealing device includes an annular groove formed on the inner surface of the housing, a seal ring with an L-shaped section housed in the annular groove, and an elastomeric O-ring disposed on the outer periphery side of the seal ring. The seal ring is composed of a thin wall portion, situated on the high-pressure side, and a thick wall portion situated on the low-pressure-side. The inner peripheral surface of the thick wall portion is in contact with the outer peripheral surface of the rod. A gap, which is wide enough to receive the hydraulic fluid, is defined between the inner peripheral surface of the thin wall portion and the outer peripheral surface of the rod. A drain recovery hole is connected between the high- and low-pressure sealing devices.