US5707091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fastener
Assignee: Tarmo Co Ltd
•
Filing: 1996-06-05
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Granted: 1998-01-13
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Expires: 2016-06-05
Abstract
Abstract A magnetic fastener has a fastening element N having a strong ferromagnetic component 20 placed on the magnetic pole 10b of the permanent magnet 10. The magnet 10 has a hole 11 extend in the direction of magnetic field. The Fastener also has an element to be attracted M having a strong ferromagnetic component 50. The ferromagnetic component 50 will be pulled to the other side 10a of the permanent magnet 10 on the fastening element N. The element to be attracted M can also be designed in such a way that the fastening element N snaps on and off through the hole 11. At least one of the ferromagnetic components 20 and 50 protrudes beyond the circumference of the permanent magnet 10 for more than 0.1 mm but no more than 2.0 mm, when the diameter of the permanent magnet is 18 mm.
Inventors
- 👤 Tamao Morita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:10
CPC Classifications
E; E05; E05C; E05C19/00; E05C19/16; Y; Y10; Y10T; Y10T24/00; Y10T24/32; Y10T292/00; Y10T292/11
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
In a magnetic fastener comprising a fastening element comprising: a substantially circular first ferromagnetic component having a first diameter O, a substantially annular permanent magnet comprising an outer side wall having a diameter L, a central hole, and first and second end walls, first and second magnetic poles being formed on respective said first and second end walls, said permanent magnet positioned in abutment with said first ferromagnetic component, and a case made of non-magnetic material, said case comprising a case top and a substantially cylindrical outer side wall, said case top covering said permanent magnet with one of said magnetic poles contacting an interior of said case top; and an attracting element comprising a second circular ferromagnetic component having a second diameter S, the improvement wherein: at least one of the two ratios O/L and S/L is between 9.1/9 and 11/9.
Claim 2
Dependent Claim
142 words
In a magnetic fastener comprising a fastening element comprising: a substantially circular first ferromagnetic component having a first diameter O, a substantially annular permanent magnet comprising an outer side wall having a diameter L, a central hole, and first and second end walls, first and second magnetic poles being formed on respective said first and second end walls, said permanent magnet positioned in abutment with said first ferromagnetic component, and a case made of non-magnetic material, said case comprising a case top and a substantially cylindrical outer side wall, said case top covering said permanent magnet with one of said magnetic poles contacting an interior of said case top; and an attracting element comprising a second circular ferromagnetic component having a second diameter S, the improvement wherein: at least one of the two ratios O/L and S/L is between 9.1/9 and 11/9.
Claim 3
Dependent Claim
15 words
The improvement of claim 1, wherein both of the ratios are within the stated range.
Claim 4
Dependent Claim
18 words
The improvement of claim 1, wherein at least one of O/L and S/L are between 10.3/9 and 11/9.
Claim 5
Dependent Claim
16 words
The improvement of claim 3, wherein both ratios O/L and S/L are within the stated range.
Claim 6
Dependent Claim
17 words
The improvement of claim 3, wherein L is 18 mm and O and S are substantially identical.
Claim 7
Dependent Claim
135 words
A magnetic fastener comprising a fastening element and an attracting element, said fastener movable between an open position in which said elements are separated from one another and a closed position in which said elements abut one another, said fastening element comprising: a substantially circular first ferromagnetic component having a first diameter O, and a substantially annular permanent magnet comprising an outer side wall having a diameter R, a central hole, and first and second end walls, first and second magnetic poles being formed on respective said first and second end walls, said permanent magnet positioned in abutment with said first ferromagnetic component, and said attracting element comprising: a second substantially circular ferromagnetic component having a second diameter S, wherein at least one of the two ratios, O/L and S/L, is between 9.1/9 and 11/9.
Claim 8
Dependent Claim
135 words
A magnetic fastener comprising a fastening element and an attracting element, said fastener movable between an open position in which said elements are separated from one another and a closed position in which said elements abut one another, said fastening element comprising: a substantially circular first ferromagnetic component having a first diameter O, and a substantially annular permanent magnet comprising an outer side wall having a diameter R, a central hole, and first and second end walls, first and second magnetic poles being formed on respective said first and second end walls, said permanent magnet positioned in abutment with said first ferromagnetic component, and said attracting element comprising: a second substantially circular ferromagnetic component having a second diameter S, wherein at least one of the two ratios, O/L and S/L, is between 9.1/9 and 11/9.
Claim 9
Dependent Claim
29 words
The fastener of claim 6, wherein the first and second ferromagnetic components are ferromagnetic plates, each plate being formed with a hole formed in a center of that plate.
Claim 10
Dependent Claim
57 words
The fastener of claim 7, wherein a first rod is fixed in the hole of the first ferromagnetic plate, and a second rod is fixed in the hole of the second ferromagnetic plate, said first and second rods abutting one another within the central hole of the permanent magnet when the fastener is in the closed position.
Claim 11
Dependent Claim
43 words
The fastener of claim 8, wherein the first and second rods protrude from respective said first and second plates, said first and second rods abutting one another within the central hole of the permanent magnet when the fastener is in the closed position.
Claim 12
Dependent Claim
13 words
The fastener of claim 6, wherein both ratios are within the stated range.
References Cited (Backward Citations)
US1296427A
Cited
US2901278A
Cited
US2975497A
Cited
US3111736A
Cited
US3141216A
Cited
FR1351339A
Cited
US3364532A
Cited
US4021891A
Cited
US4021891B2
Cited
US4021891B1
Cited
USD247468S
Cited
JPS5277900A
Cited
GB1519246A
Cited
US4310188A
Cited
US4455719A
Cited
US4480361A
Cited
JPS58108714A
Cited
JPS58145106A
Cited
JPS5918615A
Cited
JPS59119804A
Cited
US4736494A
Cited
US4700436A
Cited
US4779314A
Cited
US5142746A
Cited
US5274889A
Cited
US5208951A
Cited
US5249338A
Cited
US5152035A
Cited
US5251362A
Cited
US5448806A
Cited
US5253394A
Cited
US5377392A
Cited
US5199138A
Cited
US5432986A
Cited
US5473799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-12 | 2001-07-14 | 2002-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-12 | 2005-07-14 | 2006-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-12 | 2009-07-14 | 2010-01-13 | $7700.00 | Window Closed / Lapsed |