US5473799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic closure device
Assignee: Application Art Laboratories Co Ltd
•
Filing: 1994-02-23
•
Granted: 1995-12-12
•
Expires: 2014-02-23
Abstract
Abstract A magnetic closure device is configured to allow for a reduction in the magnetic gap as well as for adding mechanical strength to a cover for enclosing the magnet supply and other associated parts on one of two separate elements. The magnetic closure device includes a first element and a second element which are magnetically and mechanically coupled together and may be detached. The first element A includes an annular member formed to have a thick wall and mounted around the cover. The annular member includes ornamentation at its surface. The annular member may be formed from brass or other nonmagnetic materials, including plastics.
Inventors
- 👤 Yoshihiro Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:32
CPC Classifications
E; E05; E05C; E05C19/00; E05C19/16; A; A45; A45C; A45C13/00; A45C13/10; A45C13/1069; E05B; E05B15/00; E05B15/16; E05B15/1635; Y; Y10; Y10T; Y10T24/00; Y10T24/19; Y10T24/1959; Y10T24/32; Y10T292/00; Y10T292/11
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
116 words
A magnetic closure device comprising: a magnetically attracting first element; a magnetically attractable second element comprising a ferromagnetic plate; wherein said first element comprises a cylindrical magnet having a central axial bore and first and second axial ends respectively with first and second opposite polarities, a ferromagnetic plate fixed to said first end of said cylindrical magnet, a ferromagnetic rod extending from said ferromagnetic plate of said first element into said central axial bore of said cylindrical magnet, an annular cover member covering said second axial end of said cylindrical magnet, and an annular cylindrical wall fixedly mounted around said cylindrical magnet; and wherein said annular cylindrical wall is substantially thicker than said annular cover member.
Claim 2
Dependent Claim
116 words
A magnetic closure device comprising: a magnetically attracting first element; a magnetically attractable second element comprising a ferromagnetic plate; wherein said first element comprises a cylindrical magnet having a central axial bore and first and second axial ends respectively with first and second opposite polarities, a ferromagnetic plate fixed to said first end of said cylindrical magnet, a ferromagnetic rod extending from said ferromagnetic plate of said first element into said central axial bore of said cylindrical magnet, an annular cover member covering said second axial end of said cylindrical magnet, and an annular cylindrical wall fixedly mounted around said cylindrical magnet; and wherein said annular cylindrical wall is substantially thicker than said annular cover member.
Claim 3
Dependent Claim
18 words
A magnetic closure device as recited in claim 1, wherein said annular cylindrical wall is formed of plastic.
Claim 4
Dependent Claim
18 words
A magnetic closure device as recited in claim 1, wherein said annular cylindrical wall is formed of metal.
Claim 5
Dependent Claim
25 words
A magnetic closure device as recited in claim 1, wherein ornamentation is provided at a periphery of said annular cylindrical wall of said first element.
Claim 6
Dependent Claim
37 words
A magnetic closure device as recited in claim 1, wherein said annular cylindrical wall has a gradually increasing height from a first peripheral location thereof to a second peripheral location thereof diametrically opposite said first peripheral location.
Claim 7
Dependent Claim
25 words
A magnetic closure device as recited in claim 1, further comprising means for guiding said second element toward said second end of said cylindrical magnet.
Claim 8
Dependent Claim
32 words
A magnetic closure device as recited in claim 1, wherein said annular cover member is inclined in a direction downwardly and radially inwardly into said central axial bore of said cylindrical magnet.
Claim 9
Dependent Claim
21 words
A magnetic closure device as recited in claim 7, wherein said annular cover member is integral with said annular cylindrical wall.
Claim 10
Dependent Claim
43 words
A magnetic closure device as recited in claim 1, wherein an end of said annular cylindrical wall adjacent said second end of said cylindrical magnet is inclined in a direction downwardly and radially inwardly toward said central axial bore of said cylindrical magnet.
Claim 11
Dependent Claim
28 words
A magnetic closure device as recited in claim 1, wherein said annular cylindrical wall includes means for mechanically retaining said second element in engagement with said first element.
Claim 12
Dependent Claim
63 words
A magnetic closure device as recited in claim 1, wherein said annular cylindrical wall has a reduced diameter shoulder at an end thereof adjacent said second end of said cylindrical magnet; and said ferromagnetic plate of said second element includes an annular flange depending from a periphery thereof, said annular flange being engageable about said reduced diameter shoulder of said annular cylindrical wall.
Claim 13
Dependent Claim
67 words
A magnetic closure device as recited in claim 1, wherein said second end of said cylindrical magnet extends beyond said annular cylindrical wall so as to constitute a reduced diameter shoulder of said first element; and said ferromagnetic plate of said second element includes an annular flange depending from a periphery thereof, said annular flange being engageable about said reduced diameter shoulder of said annular cylindrical wall.
Claim 14
Dependent Claim
51 words
A magnetic closure device as recited in claim 1, wherein said annular cylindrical wall has a recess formed at an outer periphery thereof; and said ferromagnetic plate of said second element includes a projection depending from a periphery thereof, said projection being engageable in said recess of said annular cylindrical wall.
Claim 15
Dependent Claim
30 words
A magnetic closure device as recited in claim 1, wherein said annular cylindrical wall includes an inwardly directed annular flange extending over a peripheral portion of said annular cover member.
Claim 16
Dependent Claim
31 words
A magnetic closure device as recited in claim 1, wherein said annular cylindrical wall includes a protruding part protruding radially inwardly and upwardly above said second end of said cylindrical magnet.
Claim 17
Dependent Claim
49 words
A magnetic closure device as recited in claim 1, wherein said annular cylindrical wall includes a radially inwardly extending annular protrusion extending over said second end of said cylindrical magnet so as to define a circular groove between said annular protrusion and said second end of said cylindrical magnet.
Claim 18
Dependent Claim
18 words
A magnetic closure device as recited in claim 16, wherein said annular protrusion comprises a tapered annular protrusion.
Claim 19
Dependent Claim
18 words
A magnetic closure device as recited in claim 16, wherein said annular protrusion comprises a stepped annular protrusion.
Claim 20
Dependent Claim
21 words
A magnetic closure device as recited in claim 1, wherein said annular cover member is integral with said annular cylindrical wall.
Claim 21
Dependent Claim
36 words
A magnetic closure device as recited in claim 1, wherein said ferromagnetic rod of said first element extends in said central axial bore of said cylindrical magnet to approximately half the height of said cylindrical magnet.
Claim 22
Dependent Claim
46 words
A magnetic closure device as recited in claim 1, wherein said second element further includes a ferromagnetic rod extending from said ferromagnetic plate of said second element and being sized to be insertable into said central axial bore of said cylindrical magnet of said first element.
Claim 23
Dependent Claim
70 words
A magnetic closure device as recited in claim 1, further comprising a covering member including a cylindrical sidewall interposed between said cylindrical magnet and said annular cylindrical wall, a first annular end wall extending from one end of said cylindrical sidewall and radially inwardly beneath said ferromagnetic plate of said first element, and a second annular end wall extending from another end of said cylindrical sidewall and radially inwardly therefrom.
Claim 24
Dependent Claim
24 words
A magnetic closure device as recited in claim 22, wherein said second annular end wall of said covering member constitutes said annular cover member.
Claim 25
Dependent Claim
30 words
A magnetic closure device as recited in claim 1, wherein said ferromagnetic rod of said first element extends into and terminates within said central axial bore of said cylindrical magnet.
Claim 26
Dependent Claim
50 words
A magnetic closure device as recited in claim 1, wherein a thickness of said annular cover member constitutes an entirety of a magnetic gap between said second end of said cylindrical magnet and said ferromagnetic plate of said second element when said second element is engaged with said first element.
References Cited (Backward Citations)
US2702683A
Cited
US2806396A
Cited
US2975497A
Cited
US3009225A
Cited
US4021891B1
Cited
US4021891A
Cited
US4021891B2
Cited
GB1519246A
Cited
US4265002A
Cited
GB2095321A
Cited
US4480361A
Cited
JPS58105508A
Cited
US4779314A
Cited
DE3902289A1
Cited
GB2252593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-11 | 1999-06-12 | 1999-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-11 | 2003-06-12 | 2003-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-11 | 2007-06-12 | 2007-12-12 | $7700.00 | Window Closed / Lapsed |