Patent US3638468A successfully refreshed from Google Patents.
US3638468A
Expired / Lapsed
US
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Roll-changing means for four-high rolling mill
Assignee: Hitachi Ltd
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Filing: 1969-09-30
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Granted: 1972-02-01
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Expires: 1989-09-30
Abstract
Abstract Roll changing means for a four-high rolling mill for automatically and rapidly changing top and bottom working rolls and top and bottom backup rolls without necessitating the use of a crane by combining a working roll changing truck and a backup roll changing truck in a double-sled shifted sidewise manner.
Inventors
- 👤 Kakichi Fukui
- 👤 Shiro Imai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:59
CPC Classifications
B; B21; B21B; B21B31/00; B21B31/08; B21B31/10; B21B31/103; B21B13/00; B21B13/02; B21B2013/025; B21B2203/00; B21B2203/12; B21B2203/32
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
173 words
Roll-changing means for a four-high rolling mill comprising means provided in a rolling mill stand in parallel relation with a roll axis for supporting the roll for axial moveMent when it is removed and replaced, lifting means for placing said roll on said support means when the roll is being removed and replaced, transfer means for axially transferring the roll from and into the rolling mill stand, a working roll-changing truck provided outside the rolling mill stand for carrying used and new working rolls, a backup roll-changing truck for carrying said working roll-changing truck and used and new backup rolls, transverse transfer means for transferring said backup roll-changing truck in the direction perpendicular to the roll axis so as to change the relative position of the used and new backup rolls, means for enabling the transverse transfer means to be used for transversely transferring the working roll-changing truck, and retracting means for retracting said working roll-changing truck in a direction substantially parallel to said roll axis when the backup roll is being changed.
Claim 2
Dependent Claim
173 words
Roll-changing means for a four-high rolling mill comprising means provided in a rolling mill stand in parallel relation with a roll axis for supporting the roll for axial moveMent when it is removed and replaced, lifting means for placing said roll on said support means when the roll is being removed and replaced, transfer means for axially transferring the roll from and into the rolling mill stand, a working roll-changing truck provided outside the rolling mill stand for carrying used and new working rolls, a backup roll-changing truck for carrying said working roll-changing truck and used and new backup rolls, transverse transfer means for transferring said backup roll-changing truck in the direction perpendicular to the roll axis so as to change the relative position of the used and new backup rolls, means for enabling the transverse transfer means to be used for transversely transferring the working roll-changing truck, and retracting means for retracting said working roll-changing truck in a direction substantially parallel to said roll axis when the backup roll is being changed.
Claim 3
Dependent Claim
38 words
Roll-changing means for a four-high rolling mill in accordance with claim 1, in which said lifting means comprises hydraulic cylinders and linkages provided at the opposite sides of the rolling mill stand for vertically moving said support means.
Claim 4
Dependent Claim
58 words
Roll-changing means for a four-high rolling mill in accordance with claim 2, in which the transfer means for axially moving the top and bottom work rolls includes a traction car which is arranged so as to move along rails which are provided outside the rolling mill stand and in alignment with roll-changing rails in the rolling mill stand.
Claim 5
Dependent Claim
53 words
Roll-changing means for a four-high rolling mill in accordance with claim 3, in which said traction car includes an electric motor and a mechanism for transferring the rotation of the motor, a pinion shaft in the mechanism being arranged to engage with racks provided on the working roll-changing truck and a floor plate.
Claim 6
Dependent Claim
58 words
Roll-changing means for a four-high rolling mill in accordance with claim 3, in which the rails along which the traction car moves comprises rails provided on the working roll-changing truck outside the rolling mill stand, rails provided on a floor plate which is behind the working roll-changing truck, and shunt rails provided further rearwardly of said floor plate.
Claim 7
Dependent Claim
51 words
Roll-changing means for a four-high rolling mill according to claim 5, in which the transfer means for axially moving the top and bottom backup rolls comprises a hydraulic cylinder, a sled for carrying bearing chocks of the bottom backup roll and a hook for connecting the hydraulic cylinder and the sled.
Claim 8
Dependent Claim
61 words
Roll-changing means for a four-high rolling mill according to claim 6, in which said working roll-changing truck is mounted for movement in the direction of roll axis on the backup roll-changing truck and has on its upper surface two sets of rails for supporting the used and new working rolls and a stool inserted between the top and bottom backup rolls.
Claim 9
Dependent Claim
43 words
Roll-changing means for a four-high rolling mill according to claim 7, in which the backup roll-changing truck is slidably mounted on pedestals on the base so as to be transversely moved by the hydraulic cylinder in the direction perpendicular to the roll axis.
Claim 10
Dependent Claim
57 words
Roll-changing means for a four-high rolling mill in accordance with claim 8, in which said backup roll-changing truck is provided with a sliding surface for carrying the backup rolls for sliding movement in the direction of roll axis and a plurality of rails for carrying the working roll-changing truck for movement in the direction of roll axis.
Claim 11
Dependent Claim
58 words
Roll-changing means for a four-high rolling mill in accordance with claim 8, in which the pedestal is provided with a pair of stoppers provided at the opposite sides thereof for limiting the transverse transfer distance of the backup roll-changing truck and a pair of intermediate stoppers which can be selectively moved into and out of the operative position.
Claim 12
Dependent Claim
65 words
Roll-changing means for a four-high rolling mill in accordance with claim 1, in which an intermediate pedestal is provided between the rolling mill Stand and the backup roll-changing truck for guiding the backup rolls, the intermediate pedestal being so arranged that its upper surface aligns with the lower surface of the sled for the backup roll and the sliding surface on the backup roll-changing truck.
Claim 13
Dependent Claim
59 words
Roll-changing means for a four-high rolling mill in accordance with claim 11, in which the sled for the backup roll can be connected with the working roll-changing truck by means of a rotatable hook whereby the working roll-changing truck is rearwardly moved simultaneously when the backup rolls are moved from the rolling mill stand to the backup roll-changing truck.
Claim 14
Dependent Claim
43 words
Roll-changing means for a four-high rolling mill in accordance with claim 5, in which the floor plate located rearwardly of the working roll-changing truck is vertically movable, the floor plate being moved upwardly to provide a space for receiving the working roll-changing truck.
Claim 15
Dependent Claim
75 words
Roll-changing means according to claim 9, in which said transfer means comprises means for axially moving the top and bottom working rolls and means for axially moving the top and the bottom backup rolls and wherein said traction car includes an electric motor and a mechanism for transferring the rotation of the motor, a pinion shaft in the mechanism being arranged to engage with racks provided on the working roll-changing truck and a floor plate.
Claim 16
Dependent Claim
84 words
Roll-changing means according to claim 14, in which the pedestal is provided with a pair of stoppers provided at the opposite sides thereof while limiting the transverse transfer distance of the backup roll-changing truck and a pair of intermediate stoppers which can be selectively moved into and out of the operative position, and in which the floor plate located rearwardly of the working roll-changing trunk is vertically movable the floor plate being moved upwardly to provide a space for receiving the working roll-changing truck.
Claim 17
Dependent Claim
59 words
Roll-changing means according to claim 15, in which an intermediate pedestal is provided between the roll mill stand and the backup roll-changing truck for guiding the backup rolls, the intermediate pedestal being so arranged that its upper surface aligns with the lower surface of the sled for the backup roll and the sliding surface on the backup roll-changing truck.
Claim 18
Dependent Claim
52 words
Roll-changing means according to claim 16, in which the sled for the backup roll is connectable with the working roll-changing truck by means of a rotatable hook, whereby the working roll-changing truck is rearwardly moved simultaneously when the backup rolls are moved from the rolling mill stand to the backup roll-changing truck.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |