US4039196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical seal
Assignee: Hitachi Ltd
•
Filing: 1976-05-25
•
Granted: 1977-08-02
•
Expires: 1996-05-25
Abstract
Abstract A mechanical seal for use with shafts of rotary machines is of unitary construction for ease in handling. It can be attached to, and detached from, the sealing portion of the shaft accurately and readily. The attachment and detachment of the seal are expedited by the combination of a protuberance or protuberances of a shaft sleeve which is mounted on the shaft and carries a rotating seal element, and circumferential and axial grooves formed on the inner surface of a retainer which holds a stationary seal element.
Inventors
- 👤 Hiroshi Inouye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:25
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3464; F16J15/348
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
187 words
In a mechanical seal including a shaft sleeve fitted over a rotating shaft for rotation therewith, a rotating seal element secured to said shaft sleeve, a retainer fitted in a seal box provided around said rotating shaft, a stationary seal element held by said retainer, and spring means for urging one of said seal elements against the other so as to maintain sliding seal-face contact between said seal elements, the improvement comprising at least one protuberance formed on the outer surface of said shaft sleeve, a plurality of axially spaced, circumferential grooves formed on the inner surface of said retainer to receive said protuberance of said shaft sleeve movably therein, and a plurality of axial grooves staggered in phase and also formed on the inner surface of said retainer to assist in introducing said protuberence selectively into one of said circumferential grooves, so that the mechanical seal can be easily installed in, and removed from, said seal box by the engagement of said protuberance of said shaft sleeve with said grooves and also by the fitting of said shaft sleeve over said rotating shaft and removal therefrom.
Claim 2
Dependent Claim
187 words
In a mechanical seal including a shaft sleeve fitted over a rotating shaft for rotation therewith, a rotating seal element secured to said shaft sleeve, a retainer fitted in a seal box provided around said rotating shaft, a stationary seal element held by said retainer, and spring means for urging one of said seal elements against the other so as to maintain sliding seal-face contact between said seal elements, the improvement comprising at least one protuberance formed on the outer surface of said shaft sleeve, a plurality of axially spaced, circumferential grooves formed on the inner surface of said retainer to receive said protuberance of said shaft sleeve movably therein, and a plurality of axial grooves staggered in phase and also formed on the inner surface of said retainer to assist in introducing said protuberence selectively into one of said circumferential grooves, so that the mechanical seal can be easily installed in, and removed from, said seal box by the engagement of said protuberance of said shaft sleeve with said grooves and also by the fitting of said shaft sleeve over said rotating shaft and removal therefrom.
Claim 3
Dependent Claim
21 words
A mechanical seal according to claim 1 wherein said stationary seal element is held by said retainer through said spring means.
Claim 4
Dependent Claim
22 words
A mechanical seal according to claim 1 wherein said rotating seal element is secured to said shaft sleeve through said spring means.
Claim 5
Dependent Claim
36 words
A mechanical seal according to claim 2 wherein said shaft sleeve includes a plurality of protuberances and said retainer has a plurality of axial grooves formed on its inner surface and adapted to receive said protuberances.
Claim 6
Dependent Claim
36 words
A mechanical seal according to claim 3 wherein said shaft sleeve includes a plurality of protuberances and said retainer has a plurality of axial grooves formed on its inner surface and adapted to receive said protuberances.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |