US4757584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roll for use in calenders and the like
Assignee: Kleinewefers GmbH
•
Filing: 1987-04-29
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Granted: 1988-07-19
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Expires: 2007-04-29
Abstract
Abstract A roll for use in a calender has a stationary carrier which is surrounded by a hollow cylindrical shell with the interposition of a hydraulically operated displacing unit which can flex selected portions of the shell when necessary so as to establish a preselected nip between the peripheral surface of the shell and the shell of an adjoining roll. The hydrostatic displacing unit is flanked by two antifriction bearings which operate between the carrier and the shell and are lubricated by a circuit which is independent of the circuit that supplies hydraulic fluid to the displacing unit. This renders it possible to use in the displacing unit a fluid whose temperature is much higher than the maximum permissible temperature of lubricant for the bearings. The bearings are sealed from the respective ends of the displacing unit by single seals or by multiple seals, and any leak fluid which penetrates beyond the neighboring seal is evacuated through one or more channels in the carrier and/or in the shell. Lubricant for the bearings may but need not be identical with hydraulic fluid which is supplied to the displacing unit.
Inventors
- 👤 Josef Pav
- 👤 Richard Rauf
- 👤 Reinhard Wenzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:18
CPC Classifications
F; F16; F16C; F16C13/00; F16C13/02; D; D21; D21G; D21G1/00; D21G1/02; D21G1/0206; D21G1/0213; D21G1/022; F16C13/022; F16C13/024; F16C13/026; F16C32/00; F16C32/06; F16C32/0662; F16C32/0666
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
184 words
A pressure applying roll for use in calenders and the like, comprising a carrier; a flexible rotary cylindrical shell spacedly surrounding said carrier; hydraulic displacing means interposed between said carrier and said shell and operable to displace selected portions of said shell relative to said carrier; a source of heated hydraulic fluid; first supplying means for supplying fluid from said source to said displacing means; an antifriction bearing interposed in said shell between said carrier and said shell; a second fluid containing source of lubricant; second supplying means for supplying lubricant from said second source to said bearing; and sealing means interposed between said carrier and said shell intermediate said bearing and said displacing means to prevent or to reduce interaction between the lubricant and the fluid, said sealing means comprising a first sealing element nearer to said bearing than to said displacing means and arranged to oppose the flow of lubricant from said bearing toward said displacing means and a second sealing element nearer to said displacing means than to said bearing and arranged to oppose the flow of fluid toward said bearing.
Claim 2
Dependent Claim
184 words
A pressure applying roll for use in calenders and the like, comprising a carrier; a flexible rotary cylindrical shell spacedly surrounding said carrier; hydraulic displacing means interposed between said carrier and said shell and operable to displace selected portions of said shell relative to said carrier; a source of heated hydraulic fluid; first supplying means for supplying fluid from said source to said displacing means; an antifriction bearing interposed in said shell between said carrier and said shell; a second fluid containing source of lubricant; second supplying means for supplying lubricant from said second source to said bearing; and sealing means interposed between said carrier and said shell intermediate said bearing and said displacing means to prevent or to reduce interaction between the lubricant and the fluid, said sealing means comprising a first sealing element nearer to said bearing than to said displacing means and arranged to oppose the flow of lubricant from said bearing toward said displacing means and a second sealing element nearer to said displacing means than to said bearing and arranged to oppose the flow of fluid toward said bearing.
Claim 3
Dependent Claim
46 words
The roll of claim 1, further comprising a second bearing and second sealing means in said shell, said displacing means being disposed between said first named and said second sealing means and said second sealing means being disposed between said displacing means and said second bearing.
Claim 4
Dependent Claim
20 words
The roll of claim 1, wherein the composition of said lubricant is identical with the composition of said hydraulic fluid.
Claim 5
Dependent Claim
28 words
The roll of claim 1, wherein the hydraulic fluid is a thermal oil and the temperature of oil in said fluid source is in excess of 250° C.
Claim 6
Dependent Claim
29 words
The roll of claim 1, wherein the hydraulic fluid is a thermal oil and the temperature of oil in said source of fluid is in excess of 300° C.
Claim 7
Dependent Claim
12 words
The roll of claim 1, wherein the lubricant is gear lubricant oil.
Claim 8
Dependent Claim
32 words
The roll of claim 1, wherein said sealing elements define a compartment and said sealing means further comprises means for evacuating fluid which leaks into said compartment across the respective sealing element.
Claim 9
Dependent Claim
28 words
The roll of claim 1, wherein said lubricant supplying means comprises means for circulating the lubricant from the source of lubricant to said bearing and from said bearing.
Claim 10
Dependent Claim
16 words
The roll of claim 8, further comprising means for cooling the lubricant in said circulating means.
Claim 11
Dependent Claim
67 words
The roll of claim 1, wherein said sealing means comprises two annular seals which flank said bearing and each of which defines with the bearing an annular compartment, said lubricant supplying means comprising means for admitting lubricant into one of said compartments and means for withdrawing from the other of said compartments lubricant which flows from said one compartment, across the bearing and into the other compartment.
Claim 12
Dependent Claim
23 words
The roll of claim 1, wherein at least a portion of at least one of said supplying means is provided in said carrier.
Claim 13
Dependent Claim
42 words
The roll of claim 1, wherein said sealing elements define a compartment and further comprising means for evacuating fluid which leaks into said compartment across the respective sealing element, at least a portion of said evacuating means being provided in said carrier.
Claim 14
Dependent Claim
73 words
The roll of claim 1, wherein said sealing elements define a compartment and further comprising means for evacuating fluid which leaks into said compartment across the respective sealing element, said evacuating means comprising a channel provided in said shell and having an intake end communicating with said compartment and a discharge end, said evacuating means further comprising a fixed housing adjacent said shell and receiving fluid from the discharge end of said channel.
Claim 15
Dependent Claim
19 words
The roll of claim 13, further comprising a splash ring mounted on said shell and disposed in said housing.
Claim 16
Dependent Claim
37 words
The roll of claim 14, wherein said shell has an end face adjacent said housing and a rotor secured to said shell in the region of said end face, said splash ring being provided on said rotor.
Claim 17
Dependent Claim
14 words
The roll of claim 1, wherein said sealing means comprises a rotating mechanical seal.
Claim 18
Dependent Claim
15 words
The roll of claim 1, wherein said second sealing element includes a rotating mechanical seal.
Claim 19
Dependent Claim
15 words
The roll of claim 1, wherein said first sealing element comprises a rotating mechanical seal.
Claim 20
Dependent Claim
101 words
The roll of claim 1, wherein said sealing means further comprises a first ring surrounding said carrier, at least one second ring mounted in said shell, a third ring between said first and second rings, means for biasing said third ring axially into sealing engagement with one of said first and second rings, and at least one third sealing element interposed between said third ring and the other of said first and second rings, said first sealing element being disposed between said carrier and said first ring and said second sealing element being disposed between said second ring and said shell.
Claim 21
Dependent Claim
39 words
The roll of claim 19, wherein said first ring has a passage for leak fluid and said rings define a compartment which communicates with said passage, said carrier having a channel for evacuation of leak fluid from said compartment.
Claim 22
Dependent Claim
22 words
The roll of claim 1, wherein at least one of said sealing elements comprises an elastic lip which bears against said carrier.
Claim 23
Dependent Claim
20 words
The roll of claim 21, wherein said sealing means further comprises ring-shaped means for biasing said lip against said carrier.
Claim 24
Dependent Claim
40 words
The roll of claim 1, wherein each of said sealing elements comprises an elastic lip which bears against said carrier, said lips flaring away from each other as seen in a direction radially inwardly from said shell toward said carrier.
Claim 25
Dependent Claim
21 words
The roll of claim 23, wherein said sealing means further comprises substantially ring-shaped means for biasing said lips against said carrier.
Claim 26
Dependent Claim
41 words
The roll of claim 23, wherein said shell comprises two rings and said sealing means comprises a portion which is clamped between said rings, said carrier comprising a further ring and said lips bearing against the periphery of said further ring.
Claim 27
Dependent Claim
26 words
The roll of claim 25, wherein said sealing means further comprises a substantially membrane-like portion which is integral with said clamped portion and with said lips.
Claim 28
Dependent Claim
30 words
The roll of claim 1, wherein each of said sealing elements comprises an elastic lip and said sealing means further comprises means for integrally connecting said lips to each other.
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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) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |