US4679801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Labyrinth seal with pressurized sealing packing
Assignee: Danieli and C Officine Meccaniche SpA
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Filing: 1986-02-28
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Granted: 1987-07-14
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Expires: 2006-02-28
Abstract
Abstract Labyrinth seal (11) which is suitable for providing a seal between elements in relative rotation in the presence of infiltrating substances and which is particularly, but not only, suitable for providing a seal between rolls (12) and a housing (16) of rolling stands (10), such seal (11) comprising a stationary collar (19) and a rotary collar (18) that together form a labyrinth (26), means (24) to deliver fluid under pressure and a sealing packing (20) of a flexible material, such sealing packing (20) being located in the innermost portion of the labyrinth (26) and facing such labyrinth (26), the means (24) to deliver fluid under pressure delivering such fluid under pressure to a portion of the labyrinth next to such sealing packing (20).
Inventors
- 👤 Alfredo Poloni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:54
CPC Classifications
F; F16; F16C; F16C13/00; F16C13/02; B; B21; B21B; B21B31/00; B21B31/07; B21B31/078; F16C33/00; F16C33/72; F16C33/74; F16J; F16J15/00; F16J15/16; F16J15/40; F16C2322/00; F16C2322/12; Y; Y10; Y10S; Y10S277/00; Y10S277/904
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
114 words
A labyrinth seal for providing a seal between elements in relative motion, comprising: a stationary collar rotary collar a labyrinth defined by said stationary collar and said rotary collar; a sealing packing of a flexible material located in the innermost portion of said labyrinth and facing said labyrinth, said sealing packing comprising at least one inner lip and at least one frontal lip, each of said lips contacting said rotary collar, said packing and said rotary collar defining a toric space, the rotary collar being rotatable with respect to the inner lip and the frontal lip; and means to deliver fluid under pressure to a portion of the labyrinth next to said sealing packing.
Claim 2
Dependent Claim
114 words
A labyrinth seal for providing a seal between elements in relative motion, comprising: a stationary collar rotary collar a labyrinth defined by said stationary collar and said rotary collar; a sealing packing of a flexible material located in the innermost portion of said labyrinth and facing said labyrinth, said sealing packing comprising at least one inner lip and at least one frontal lip, each of said lips contacting said rotary collar, said packing and said rotary collar defining a toric space, the rotary collar being rotatable with respect to the inner lip and the frontal lip; and means to deliver fluid under pressure to a portion of the labyrinth next to said sealing packing.
Claim 3
Dependent Claim
19 words
A labyrinth seal as claimed in claim 1, wherein said frontal lip separates the toric space from the labyrinth.
Claim 4
Dependent Claim
17 words
A labyrinth seal as claimed in claim 1 wherein the toric space is filled with permanent lubricant.
Claim 5
Dependent Claim
17 words
A labyrinth seal as claimed in claim 2, wherein the toric space is filled with permanent lubricant.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |