US3884140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calendar having adjustable brake means
Assignee: Sulzer Escher Wyss AG
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Filing: 1974-03-27
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Granted: 1975-05-20
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Expires: 1994-03-27
Abstract
Abstract Each of the movable rolls of the calendar is associated with an adjustable brake means by which the velocity of descent of each roll can be adjusted into a pattern to effect and maintain a gap between each pair of adjacent rolls immediately upon opening of the calendar. The individual brake means are constructed as threaded studs having a bore in which a piston is mounted and to which hydraulic medium can be pumped via a restricted duct. The restricted duct cooperates with a bypass valve in the hydraulic lines to allow the hydraulic medium to flow back to a reservoir from the bore upon descent of a roll. The restricted duct of each brake means is adjustable relative to the return flow of medium so that the lower rolls are allowed to descent more rapidly than the upper rolls.
Inventors
- 👤 Alfred Christ
- 👤 Rolf Lehmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:41
CPC Classifications
F; F16; F16C; F16C13/00; F16C13/02; F16C13/022; F16C13/024; F16C13/026; D; D06; D06C; D06C15/00; D06C15/02; D21; D21G; D21G1/00; D21G1/002; F16C13/028; F16C2340/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
63 words
In combination with a calendar having a plurality of superjacent rolls, at least some of said rolls being movably mounted to descend upon opening of the calendar; a plurality of individually adjustable brake means associated with each movable roll for adjusting the velocity of each said roll during descent whereby the lowermost rolls move at a greater descending velocity than the uppermost rolls.
Claim 2
Dependent Claim
63 words
In combination with a calendar having a plurality of superjacent rolls, at least some of said rolls being movably mounted to descend upon opening of the calendar; a plurality of individually adjustable brake means associated with each movable roll for adjusting the velocity of each said roll during descent whereby the lowermost rolls move at a greater descending velocity than the uppermost rolls.
Claim 3
Dependent Claim
68 words
The combination as set forth in claim 1 wherein each brake means includes a hydraulic cylinder, a piston slidably mounted in said cylinder in sealed relation therewith for abutting a respective movable roll, a duct in said cylinder for passage of a hydraulic medium into and out of said cylinder under said piston, and an adjustable restrictor in said duct for throttling the flow of hydraulic medium therethrough.
Claim 4
Dependent Claim
32 words
The combination as set forth in claim 2 wherein each duct of each brake means is connected to a common feed means for delivering the hydraulic medium at a constant adjustable pressure.
Claim 5
Dependent Claim
56 words
The combination as set forth in claim 3 wherein said feed means includes a reservoir of hydraulic medium, a pump for pumping the hydraulic medium from said reservoir into each said duct, and a bypass valve downstream of said pump for returning the hydraulic medium from each duct to said reservoie upon opening of the calendar.
Claim 6
Dependent Claim
33 words
The combination as set forth in claim 2 wherein said cylinder has a surface defining a limiting position of a movable roll, and wherein said cylinder is aDjustably mounted to vary said position.
Claim 7
Dependent Claim
23 words
The combination as set forth in claim 2 wherein said cylinder is a screwthreaded stud having a bore therein slidably receiving said piston.
Claim 8
Dependent Claim
47 words
The combination as set forth in claim 2 further comprising a secondary braking means within said brake means, said secondary braking means including a recess within said cylinder and an extension on said piston for entering into said recess upon movement of said piston into said cylinder.
Claim 9
Dependent Claim
37 words
The combination as set forth in claim 1 further comprising a secondary brake means for each movable roll for braking the descent of said movable roll immediately prior to completion of the descent of said movable roll.
Claim 10
Dependent Claim
80 words
In combination with a downwardly movable roll of a calendar; an adjustable brake means for adjusting the descending velocity of said roll during descent, said brake means including a hydraulic cylinder, a piston slidably mounted in said cylinder in sealed relation for abutting said roll, a duct in said cylinder for passage of a hydraulic medium into and out of said cylinder under said piston, and an adjustable restrictor in said duct for throttling the flow of hydraulic medium therethrough.
Claim 11
Dependent Claim
80 words
In combination with a downwardly movable roll of a calendar; an adjustable brake means for adjusting the descending velocity of said roll during descent, said brake means including a hydraulic cylinder, a piston slidably mounted in said cylinder in sealed relation for abutting said roll, a duct in said cylinder for passage of a hydraulic medium into and out of said cylinder under said piston, and an adjustable restrictor in said duct for throttling the flow of hydraulic medium therethrough.
Claim 12
Dependent Claim
31 words
The combination as set forth in claim 9 further comprising a secondary brake means for braking the descent of said roll immediately prior to completion of the descent of said roll.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |