US3599993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for sealing of a rotary shaft
Assignee: Skega AB
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Filing: 1970-01-28
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Granted: 1971-08-17
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Expires: 1990-01-28
Abstract
Abstract A sealing device is disclosed, wherein a rotary shaft is sealed to a stationary housing or similar. A sealing means engaging the shaft is somewhat movable with the shaft in the peripheral direction. Said sealing means is held by a flexible sleeve which is shortened when twisted. The sleeve encloses a supply of lubricant that is put under raised pressure when the sleeve is twisted, thereby preventing undesired passage of particles or fluids past the sealing means.
Inventors
- 👤 Bror Allan Eriksson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:55
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/162; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/106; F16J15/002; F16N; F16N11/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
138 words
A device for sealing a rotary shaft, said device comprising a resilient sealing means for engaging the periphery of such a shaft, and a flexible, substantially inextensible sleeve attached to said sealing means, extending axially with respect to said sealing means and having an internal diameter substantially greater than that of the sealing means, the arrangement being such that when the said sealing means is disposed on a shaft to seal the same, the said sleeve is attached at a point axially spaced from the sealing means to a housing with rEspect to which the shaft is rotatable, and a space enclosed by the sleeve is filled with lubricant, rotation of the shaft is effective to rotate the sealing means thus effecting twisting of said sleeve with axial compression thereof to exert a pressure upon lubricant contained therein.
Claim 2
Independent Claim
138 words
A device for sealing a rotary shaft, said device comprising a resilient sealing means for engaging the periphery of such a shaft, and a flexible, substantially inextensible sleeve attached to said sealing means, extending axially with respect to said sealing means and having an internal diameter substantially greater than that of the sealing means, the arrangement being such that when the said sealing means is disposed on a shaft to seal the same, the said sleeve is attached at a point axially spaced from the sealing means to a housing with rEspect to which the shaft is rotatable, and a space enclosed by the sleeve is filled with lubricant, rotation of the shaft is effective to rotate the sealing means thus effecting twisting of said sleeve with axial compression thereof to exert a pressure upon lubricant contained therein.
Claim 3
Dependent Claim
28 words
A device as claimed in claim 1, in which the diameter of said sleeve is at least 50 percent greater than the internal diameter of the sealing means.
Claim 4
Dependent Claim
28 words
A device as claimed in claim 1, in which the length of the flexible portion of the sleeve is between 25 percent and 100 percent of its diameter.
Claim 5
Dependent Claim
40 words
A device as claimed in claim 1, including a further sealing means for the shaft, the sleeve extending between said sealing means in order to define together therewith an enclosure for lubricant, and the said sealing means being relatively rotatable.
Claim 6
Dependent Claim
17 words
A device as claimed in claim 1, in which the sealing means comprises a circular sealing lip.
Claim 7
Independent Claim
63 words
A device for sealing a rotary shaft to a nonrotary part, comprising a sealing means tightly engaging the periphery of said shaft, and a twistable sleeve surrounding said shaft and connecting said sealing means to said nonrotary part in such a manner as to allow said sealing means to turn with the shaft through an angle forming a substantial part of one revolution.
Claim 8
Independent Claim
63 words
A device for sealing a rotary shaft to a nonrotary part, comprising a sealing means tightly engaging the periphery of said shaft, and a twistable sleeve surrounding said shaft and connecting said sealing means to said nonrotary part in such a manner as to allow said sealing means to turn with the shaft through an angle forming a substantial part of one revolution.
Claim 9
Dependent Claim
23 words
A device as claimed in claim 6, in which the maximum value of said angle is at least 5* and not exceeding 150*.
Claim 10
Dependent Claim
23 words
A device as claimed in claim 6, in which the maximum value of said angle is at least 20* and not exceeding 70*.
Claim 11
Dependent Claim
47 words
A device as claimed in claim 6, in which said sleeve is twisted to form a number of essentially straight ridges and intermediate furrows extending over the main length of the sleeve and at an angle to the shaft as well as to a plane perpendicular thereto.
Claim 12
Dependent Claim
116 words
A stationary housing, a rotary shaft extending through a wall of said housing, a first sealing member attached to said housing, said sealing member comprising a resilient circular lip held in engagement with the periphery of said shaft, a second sealing member axially spaced from said first sealing member, said second sealing member comprising a resilient circular lip held in engagement with the periphery of said shaft, a flexible sleeve surrounding said shaft at a distance therefrom to form an enclosed space for lubricant around said shaft, one end of said sleeve being fixed and the other end thereof holding said second sealing member in such a manner as to allow axial and peripheral displacement thereof.
Claim 13
Dependent Claim
116 words
A stationary housing, a rotary shaft extending through a wall of said housing, a first sealing member attached to said housing, said sealing member comprising a resilient circular lip held in engagement with the periphery of said shaft, a second sealing member axially spaced from said first sealing member, said second sealing member comprising a resilient circular lip held in engagement with the periphery of said shaft, a flexible sleeve surrounding said shaft at a distance therefrom to form an enclosed space for lubricant around said shaft, one end of said sleeve being fixed and the other end thereof holding said second sealing member in such a manner as to allow axial and peripheral displacement thereof.
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |