US4992767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnet roll
Assignee: Proterial Ltd
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Filing: 1990-01-05
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Granted: 1991-02-12
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Expires: 2010-01-05
Abstract
Abstract The magnet roll according to the present invention comprises (a) first and second shafts rotatable around the same axis relative to each other; (b) a permanent magnet member fixed around the second shaft and having a plurality of magnetic poles extending along the axis of the second shaft on its outer surface; (c) a first flange member connected to the first shaft and rotatably supporting one end of the second shaft; (d) a second flange member rotatably supported by the second shaft; (e) a hollow cylindrical sleeve made of a plastically deformable non-magnetic material and fixed to the first and second flange members on both ends such that it encircles the permanent magnet member rotatably relative to the permanent magnet member; and (f) an inner diameter-increased area provided in each side end portion of the sleeve, which receives each flange member and is folded inward over each flange member to fix the sleeve to each flange member.
Inventors
- 👤 Waichi Hozumi
- 👤 Keitaro Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:20
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0921; G03G21/00; G03G21/0005; G03G21/0047; G03G2221/00; G03G2221/0005
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
152 words
A magnet roll comprising: (a) first and second shafts rotatable around the same axis relative to each other; (b) a permanent magnet member fixed around said second shaft and having a plurality of magnetic poles extending along the axis of said second shaft on its outer surface; (c) a first flange member connected to said first shaft and rotatably supporting one end of said second shaft; (d) a second flange emember rotatably supported by said second shaft; (e) a hollow cylindrical sleeve made of a plastically deformable non-magnetic material and fixed to said first and second flange members on both ends such that it encircles said permanent magnet member rotatably relative to said permanent magnet member; and (f) an inner diameter-increased area provided in each side end portion of said sleeve, which receives each flange member and is folded inward over each flange member to fix said sleeve to each flange member.
Claim 2
Dependent Claim
152 words
A magnet roll comprising: (a) first and second shafts rotatable around the same axis relative to each other; (b) a permanent magnet member fixed around said second shaft and having a plurality of magnetic poles extending along the axis of said second shaft on its outer surface; (c) a first flange member connected to said first shaft and rotatably supporting one end of said second shaft; (d) a second flange emember rotatably supported by said second shaft; (e) a hollow cylindrical sleeve made of a plastically deformable non-magnetic material and fixed to said first and second flange members on both ends such that it encircles said permanent magnet member rotatably relative to said permanent magnet member; and (f) an inner diameter-increased area provided in each side end portion of said sleeve, which receives each flange member and is folded inward over each flange member to fix said sleeve to each flange member.
Claim 3
Dependent Claim
17 words
The magnet roll according to claim 1, wherein an outer edge of each flange member is chamfered.
Claim 4
Dependent Claim
20 words
The magnet roll according to claim 2, wherein said chamfered portion of said flange member is provided with a knurl.
Claim 5
Dependent Claim
35 words
The magnet roll according to claim 1, wherein said flange members are provided with a serration knurl on at least part of their circumferential surfaces, thereby fixing said sleeve to said flange members further strongly.
Claim 6
Dependent Claim
44 words
The magnet roll according to claim 1, wherein said flange member is provided with a diameter-reduced portion on its outer end surface, the axial length of said diameter-reduced portion being longer than an excess portion of the folded side end portion of said sleeve.
Claim 7
Dependent Claim
41 words
The magnet roll according to claim 1, wherein one of said flange members is provided with an annular groove or annular projection on its circumferential surface, to which the side end portion of said sleeve is integrally fixed by cold working.
References Cited (Backward Citations)
GB899634A
Cited
US4167718A
Cited
JPS59161156A
Cited
JPS605537A
Cited
JPS6232295A
Cited
JPS6232296A
Cited
JPS6235090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |