US4505485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary seal with linear wear resistant treated layer
Assignee: Nippon Piston Ring Co Ltd
•
Filing: 1983-06-07
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Granted: 1985-03-19
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Expires: 2003-06-07
Abstract
Abstract A rotary seal improved in quality by providing relatively movable seal surfaces in the form of a hardened, wear resistant layer covering only a part of the seal body surface. In particular the hardened layer may be formed in a helical fashion such that upon relative rotation of the seal surfaces, entering abrasives and the like may be shunted to the outside periphery of the seal, per se.
Inventors
- 👤 Osamu Hirakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:40
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3436; F16J15/344; F16J15/3496
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
58 words
A rotary seal for sealing between two relatively rotatable surfaces, comprising; at least one rotary seal surface having a wear resistant treated layer, said wear resistant treated layer formed on the rotary seal surface being of a linear form, said linear wear resistant treated layer being formed obliquely with respect to the circumferential direction of said seal surface.
Claim 2
Dependent Claim
58 words
A rotary seal for sealing between two relatively rotatable surfaces, comprising; at least one rotary seal surface having a wear resistant treated layer, said wear resistant treated layer formed on the rotary seal surface being of a linear form, said linear wear resistant treated layer being formed obliquely with respect to the circumferential direction of said seal surface.
Claim 3
Dependent Claim
24 words
A rotary seal as claimed in claim 1, wherein said wear resistant treated layer is a hardened layer formed by surface re-melting and cooling.
Claim 4
Dependent Claim
17 words
A rotary seal as claimed in claim 1, wherein said treated layer comprises deposit alloyed, hardened layer.
Claim 5
Dependent Claim
23 words
A rotary seal as claimed in claim 1, wherein said linear treated layer on the rotary seal is in the form of helix.
Claim 6
Dependent Claim
15 words
A rotary seal as claimed in claim 1, wherein said linear treated layer is continuous.
Claim 7
Dependent Claim
29 words
A rotary seal as claimed in claim 1, wherein said linear treated layer comprises a plurality of discontinuous curvilinear portions each arranged obliquely with respect to said circumferential direction.
Claim 8
Dependent Claim
23 words
A rotary seal as claimed in claim 6, and further including a circular treated layer arranged proximate end portions of said curvilinear portions.
Claim 9
Dependent Claim
32 words
A rotary seal as claimed in claim 5, wherein said linear treated layer comprises a sinuous layer having a predetermined amplitude, and oscillating primarily in a direction oblique to said circumferential direction.
References Cited (Backward Citations)
CA644840A
Cited
US3539192A
Cited
US3810637A
Cited
US3814447A
Cited
US4132419A
Cited
GB2060132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-18 | 1988-09-17 | 1989-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-18 | 1992-09-17 | 1993-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-18 | 1996-09-17 | 1997-03-19 | $7700.00 | Window Closed / Lapsed |