US3645543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft packing assembly
Assignee: Parker Hannifin Corp
•
Filing: 1970-08-14
•
Granted: 1972-02-29
•
Expires: 1990-08-14
Abstract
Abstract This disclosure relates to a packing capable of accommodating limited transverse relative movement of a shaft and housing sealed thereby. The packing includes a combination of backup rings which prevent seal extrusion between the shaft and the housing while permitting the transverse movement.
Inventors
- 👤 Kazimierz T Ksieski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:31
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204; F16J15/3208; F16J15/166; F16J15/3224
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
A backup ring system for use with a packing to seal a shaft relative to a housing in which the shaft is received, said backup ring system comprising concentric inner and outer rings having a radial gap therebetween and radially located between the shaft and housing and axially opposite the packing, said inner ring being radially displaceable relative to the housing, and an intermediate ring axially between the packing and said inner and outer rings and in face-to-face contact with said inner and outer rings and bridging said gap.
Claim 2
Dependent Claim
89 words
A backup ring system for use with a packing to seal a shaft relative to a housing in which the shaft is received, said backup ring system comprising concentric inner and outer rings having a radial gap therebetween and radially located between the shaft and housing and axially opposite the packing, said inner ring being radially displaceable relative to the housing, and an intermediate ring axially between the packing and said inner and outer rings and in face-to-face contact with said inner and outer rings and bridging said gap.
Claim 3
Dependent Claim
23 words
The system of claim 1 wherein said inner ring has a close fit on the rod to prevent extrusion of the packing therebetween.
Claim 4
Dependent Claim
27 words
The system of claim 1 wherein said outer ring has a close fit at its outside diameter with said housing to prevent extrusion of said packing therebetween.
Claim 5
Dependent Claim
16 words
The system of claim 1 wherein said outer ring is an integral part of the housing.
Claim 6
Dependent Claim
18 words
The backup system of claim 1 wherein said third ring is mounted within a groove in the packing.
Claim 7
Dependent Claim
18 words
The backup ring system of claim 1 wherein said rings are of material more rigid than the packing.
Claim 8
Dependent Claim
52 words
The system of claim 1 in which there is a radial clearance between the shaft and housing that is larger when the shaft is centered in the housing than the total of the radial clearances between the shaft and inner ring, the housing and outer ring, and the clearance constituting said gap.
Claim 9
Dependent Claim
32 words
The system of claim 1 in which when the shaft is centered in the housing the clearance between the shaft and inner ring is less than the radial width of said gap.
Claim 10
Dependent Claim
32 words
The system of claim 1 in which when the shaft is centered in said housing the clearance between the housing and outer ring is less than the radial width of the gap.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |