US3742852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic printing cylinder
Assignee: Day International Corp
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Filing: 1971-10-01
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Granted: 1973-07-03
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Expires: 1991-10-01
Abstract
Abstract A magnetized cylinder and method of making same is provided wherein a plurality of compressible resilient permanent magnet constructions is provided and each is defined by permanent magnets embedded in an elastomeric compressible matrix. Each permanent magnet construction is frictionally held within an associated retaining means of an annular member made of a nonmagnetic material and comprising the magnetized cylinder. The annular members are supported alternately with a plurality of rings made of a magnetic material along an elongated central support to define such cylinder. The use of such permanent magnet constructions enables each magnet construction to be held in more intimate contact against an associated ring and more firmly within associated retaining means due to the radial expansion thereof caused by compression of each magnet construction in its assembled state.
Inventors
- 👤 D Leffler
- 👤 W Dempster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:13
CPC Classifications
B; B41; B41F; B41F27/00; B41F27/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
146 words
A magnetized cylinder comprising, an elongated central support, a plurality of annular members made of non-magnetic material and carried concentrically around said support, each of said annular members having an outer cylindrical surface and retaining means therein, a plurality of rubberlike compressible permanent magnet means defined by permanent magnets embedded in an elastomeric matrix, each of said permanent magnet means being in an axially compressed condition so that its axial dimension is less than its corresponding axial dimension in an uncompressed condition, and a plurality of rings made of a magnetic material, said rings being supported alternately with said annular members along said support, said permanent magnet means being held within associated retaining means and with the poles of the magnet means arranged against an associated ring having like polarity so that said rings define pole pieces of alternating polarity alonG the length of said cylinder.
Claim 2
Dependent Claim
146 words
A magnetized cylinder comprising, an elongated central support, a plurality of annular members made of non-magnetic material and carried concentrically around said support, each of said annular members having an outer cylindrical surface and retaining means therein, a plurality of rubberlike compressible permanent magnet means defined by permanent magnets embedded in an elastomeric matrix, each of said permanent magnet means being in an axially compressed condition so that its axial dimension is less than its corresponding axial dimension in an uncompressed condition, and a plurality of rings made of a magnetic material, said rings being supported alternately with said annular members along said support, said permanent magnet means being held within associated retaining means and with the poles of the magnet means arranged against an associated ring having like polarity so that said rings define pole pieces of alternating polarity alonG the length of said cylinder.
Claim 3
Dependent Claim
33 words
A cylinder as set forth in claim 1 in which each of said annular members has a plurality of cutouts therein defining a peripheral wall which retains an associated permanent magnet means therewithin.
Claim 4
Dependent Claim
33 words
A cylinder as set forth in claim 2 in which each of said cutouts extends completely through its associated annular member and is arranged in close proximity to the peripheral outside surface thereof.
Claim 5
Dependent Claim
85 words
A cylinder as set forth in claim 1 in which said central support has a longitudinal axis which defines the longitudinal axis of said cylinder, each of said annular members has a substantially T-shaped cross-sectional configuration with the vertical leg of the T being arranged perpendicular to said axis and the horizontal arm thereof being arranged parallel to said axis with the inside cylindrical surface of said arm arranged to one side of said leg defining circumferential retaining means for an associated permanent magnet means.
Claim 6
Dependent Claim
57 words
A cylinder as set forth in claim 4 in which each of said permanent magnet means comprises an annular disc-like member having its peripheral surface retained by an associated circumferential retaining means and having a pair of opposed parallel planar surfaces with the entire area of one of said planar surfaces yieldingly compressed against an associated ring.
Claim 7
Dependent Claim
36 words
A cylinder as set forth in claim 4 in which the arm of each T-shaped annular member has a dimension parallel to its leg which is a small fractional part of the height of said leg.
Claim 8
Dependent Claim
20 words
A cylinder as set forth in claim 3 in which said cutouts are angularly spaced apart substantially equal angular increments.
Claim 9
Dependent Claim
57 words
A cylinder as set forth in claim 1 in which each permanent magnet means is frictionally held within an associated retaining means, each permanent magnet means being held axially compressed by at least one associated ring and thus in intimate contact thereagainst to assure the provision of magnetic lines of force around said cylinder having optimum strength.
Claim 10
Dependent Claim
40 words
A cylinder as set forth in claim 8 in which each of said permanent magnet means has a pair of opposed parallel annular planar surfaces one of which has its entire surface area yieldingly compressed against said one associated ring.
Claim 11
Dependent Claim
60 words
A cylinder as set forth in claim 1 in which each permanent magnet means is frictionally held within an associated retaining means, each permanent magnet means being held axially compressed in sandwiched relation between a pair of associated rings and thus in intimate contact thereagainst to assure the provision of magnetic lines of force around said cylinder having optimum strength.
Claim 12
Dependent Claim
53 words
A cylinder as set forth in claim 10 in which each of said annular members has a uniform thickness throughout and each permanent magnet means comprises a polygonal disc-like member having a pair of opposed parallel planar surfaces with the entire areas of said planar surfaces yieldingly compressed between said pair of rings.
Claim 13
Dependent Claim
26 words
A cylinder as set forth in claim 1 in which said elastomeric matrix comprising each permanent magnet means comprises a high molecular weight organic plastic material.
Claim 14
Dependent Claim
43 words
A cylinder as set forth in claim 1 in which each of said compressible permanent magnet means is compressed within an associated retaining means and frictionally held in position by the tendency of the permanent magnet means to return to its uncompressed condition.
Claim 15
Dependent Claim
40 words
A cylinder as set forth in claim 1 in which each permanent magnet means in its axially compressed condition has an axial dimension which is several thousandths of an inch less than its corresponding axial dimension in an uncompressed condition.
References Cited (Backward Citations)
US179399A
Cited
US2952205A
Cited
US3097598A
Cited
US3409806A
Cited
US3228133A
Cited
US3438324A
Cited
US3496866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |