Patent US4136885A successfully refreshed from Google Patents.
US4136885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial shaft sealing unit for sealing a stationary machine part relative to a rotatable machine part
Assignee: Kupfer Asbest Co
•
Filing: 1978-01-25
•
Granted: 1979-01-30
•
Expires: 1998-01-25
Abstract
Abstract An axial shaft sealing unit for sealing a stationary machine part relative to a rotatable machine part. The sealing unit includes a slide ring seal mounted on the stationary machine part in a sealing manner and includes a housing with a bottom located transversely to the axis of the slide ring seal, a primary seal forming a sliding ring, a bellows-like secondary seal, and a compression spring arranged between the primary seal and the housing bottom or base. The bellows-like secondary seal is vulcanized in a position which corresponds substantially to its installed position and is held in this position in its operative state by a detachable holder. A counter ring rests directly against a machine component which is non-rotatably connected to the rotatable machine part.
Inventors
- 👤 Klaus-Jurgen Uhrner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:06
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3464; F16J15/348; F16J15/36
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
191 words
An axial shaft sealing unit for sealing a stationary machine part relative to a rotatable machine part, especially a pump shaft, which includes: a slide ring seal adapted to be mounted on a stationary machine part in a sealing manner and comprising a housing with a bottom surface located transversely to the slide ring seal axis, a primary seal forming a sliding ring and having a sealing surface; a bellows-like secondary seal, and compression spring means arranged between said primary seal and said housing bottom surface; a counter ring connectible to said rotatable machine part in a rotation-proof manner and resting with said counter sealing surface against said sealing surface of said primary seal; a holder interconnecting said counter ring and said slide ring seal; said counter ring and said slide ring being coaxially arranged with regard to each other; said bellows-like secondary seal being vulcanized in a position corresponding substantially to its installed position and being held in said last mentioned position by said holder; said holder being detachable; and a machine component for non-rotatable connection to the rotatable machine part; said counter ring resting directly against said machine component.
Claim 2
Dependent Claim
191 words
An axial shaft sealing unit for sealing a stationary machine part relative to a rotatable machine part, especially a pump shaft, which includes: a slide ring seal adapted to be mounted on a stationary machine part in a sealing manner and comprising a housing with a bottom surface located transversely to the slide ring seal axis, a primary seal forming a sliding ring and having a sealing surface; a bellows-like secondary seal, and compression spring means arranged between said primary seal and said housing bottom surface; a counter ring connectible to said rotatable machine part in a rotation-proof manner and resting with said counter sealing surface against said sealing surface of said primary seal; a holder interconnecting said counter ring and said slide ring seal; said counter ring and said slide ring being coaxially arranged with regard to each other; said bellows-like secondary seal being vulcanized in a position corresponding substantially to its installed position and being held in said last mentioned position by said holder; said holder being detachable; and a machine component for non-rotatable connection to the rotatable machine part; said counter ring resting directly against said machine component.
Claim 3
Dependent Claim
46 words
A shaft sealing unit according to claim 1, which includes snap connection means and in which said holder for the counter ring and the slide ring seal is cap-shaped and is detachably connected to said housing of the slide ring seal by said snap connection means.
Claim 4
Dependent Claim
38 words
A shaft sealing unit according to claim 1, which includes a compression spring, and in which said holder comprises an axial stop for said counter ring, said compression spring holding said counter ring in engagement with said stop.
Claim 5
Dependent Claim
24 words
A shaft sealing unit according to claim 1, in which said counter ring is fixed in the axial and radial directions by said holder.
Claim 6
Dependent Claim
43 words
A shaft sealing unit according to claim 4, in which said counter ring frictionally engages said holding collar, and in which said holding collar has approximately the same axial length as said counter ring and is non-rotatably connectible to the rotatable machine part.
Claim 7
Dependent Claim
44 words
A shaft sealing unit according to claim 1, in which said holder has on its outside at least one interlocking part for engagement with a corresponding counter interlocking part of a pressing-in tool for inserting said shaft sealing unit into the stationary machine part.
Claim 8
Dependent Claim
31 words
A shaft sealing unit according to claim 6, in which said interlocking part has an abutting surface extending to the front and top in the slide-on direction of the pressing-in tool.
Claim 9
Dependent Claim
20 words
A shaft sealing unit according to claim 7, in which said holder has a cylindrical section comprising said interlocking part.
Claim 10
Dependent Claim
83 words
A shaft sealing unit according to claim 1, in which said housing includes a flange and in which said holder has a circular groove engaged by said flange, said holder having a shoulder against which said flange rests, said shoulder extending approximately at right angles to the axis of said slide ring seal and being adjoined by a marginal portion of said holder, said marginal portion being directed towards said housing and extending obliquely outwardly with respect to the axis of said holder.
Claim 11
Dependent Claim
45 words
A shaft sealing unit according to claim 3, in which one end of said holder is located in the area of said counter ring and comprises an introduction opening for the pressing-in tool, said opening being elastically expandable for the release of said axial stop.
Claim 12
Dependent Claim
29 words
A shaft sealing unit according to claim 10, in which said introduction opening is bounded by at least one collar located approximately radially to the axis of said holder.
Claim 13
Dependent Claim
24 words
A shaft sealing unit according to claim 10, in which said collar comprises an outer surface inclined relative to the axis of said holder.
Claim 14
Dependent Claim
42 words
A shaft sealing unit according to claim 12, in which said outer surface forms a guiding surface for an ejector of the pressing-in tool, said ejector being arranged in a sleeve-shaped guide for the holder, said guide being stop-bounded on said shoulder.
Claim 15
Dependent Claim
24 words
A shaft sealing unit according to claim 13, in which said guide comprises the counter interlocking part for the interlocking part of the holder.
Claim 16
Dependent Claim
50 words
A shaft sealing unit according to claim 13, in which said ejector comprises at least one expanding member for said introduction opening of said holder, said expanding member being in the form of a frustum of a cone tepering to the front in the slide-on direction of the pressing-in tool.
Claim 17
Dependent Claim
47 words
A shaft sealing unit according to claim 9, in which said marginal portion of said holder directed towards said housing of said slide ring seal is elastically deformable in response to the shaft sealing unit being pressed into a recess for the release of said snap connection.
Claim 18
Dependent Claim
55 words
A shaft sealing unit according to claim 3, which includes an axial stop for said counter ring, said stop being formed by elastically deformable tongues which are located obliquely to the axis of said holder, the dimensional stability of said tongues being greater than the tension in said compression spring acting on the counter ring.
Claim 19
Dependent Claim
35 words
A shaft sealing unit according to claim 1, in which a frusto-conical portion of the rotatable machine part is provided as the expanding member for the radial expansion of the introduction opening of said holder.
References Cited (Backward Citations)
US3123364A
Cited
US1856581A
Cited
GB802247A
Cited
FR1138637A
Cited
US3536333A
Cited
US3743305A
Cited
US3813102A
Cited
US3947944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |