US4200852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic locking apparatus
Assignee: Application Art Laboratories Co Ltd
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Filing: 1977-12-09
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Granted: 1980-04-29
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Expires: 1997-12-09
Abstract
Abstract An improved magnetic locking apparatus includes two elements which are magnetically attached, whereby the first magnetic supply element both magnetically attracts the second element and engages it for being coupled therewith. The construction of the two elements permits the elements to be securely attached against accidental external forces perpendicular to and parallel to the coupled surfaces of the elements.
Inventors
- 👤 Yoshihiro Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:49
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/02; H01F7/0231; H01F7/0252; H01F7/0263; B; B23; B23Q; B23Q3/00; B23Q3/15; B23Q3/154; B23Q3/1546; Y; Y10; Y10T; Y10T24/00; Y10T24/32
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
167 words
A magnetic locking apparatus comprising: at least one permanent magnet having first and second opposite side surfaces and an end surface extending between said first and second side surfaces; a first ferromagnetic member on said first side surface of said permanent magnet, said first ferromagnetic member having an end portion extending outwardly beyond said end surface of said permanent magnet; nonferromagnetic material enclosing said permanent magnet and covering said second side surface of said permanent magnet, said nonferromagnetic material being spaced from said end surface of said permanent magnet to define therebetween a chamber, said nonferromagnetic material having an aperture therethrough into said chamber; and a second ferromagnetic member removably mounted on that portion of said nonferromagnetic material covering said second side surface of said permanent magnet, said second ferromagnetic member having a hook portion extending through said aperture and said chamber into contact with said end portion of said first ferromagnetic member, said aperture and said chamber having a substantially greater thickness than said hook portion.
Claim 2
Dependent Claim
167 words
A magnetic locking apparatus comprising: at least one permanent magnet having first and second opposite side surfaces and an end surface extending between said first and second side surfaces; a first ferromagnetic member on said first side surface of said permanent magnet, said first ferromagnetic member having an end portion extending outwardly beyond said end surface of said permanent magnet; nonferromagnetic material enclosing said permanent magnet and covering said second side surface of said permanent magnet, said nonferromagnetic material being spaced from said end surface of said permanent magnet to define therebetween a chamber, said nonferromagnetic material having an aperture therethrough into said chamber; and a second ferromagnetic member removably mounted on that portion of said nonferromagnetic material covering said second side surface of said permanent magnet, said second ferromagnetic member having a hook portion extending through said aperture and said chamber into contact with said end portion of said first ferromagnetic member, said aperture and said chamber having a substantially greater thickness than said hook portion.
Claim 3
Dependent Claim
56 words
An apparatus as claimed in claim 1, wherein said first ferromagnetic member is fixedly secured to said first side surface of said permanent magnet, and said hook portion of said second ferromagnetic member is in contact with said end surface of said permanent magnet and in abutment with said end portion of said first ferromagnetic member.
Claim 4
Dependent Claim
45 words
An apparatus as claimed in claim 2, wherein said end portion of said first ferromagnetic member has therein, on a side thereof facing away from said hook portion, a recess, and said hook portion has fixed thereto a nonferromagnetic hook member fitting into said recess.
Claim 5
Dependent Claim
33 words
An apparatus as claimed in claim 1, comprising a plurality of axially aligned said permanent magnets, said nonferromagnetic material enclosing all of said permanent magnets and having therein a plurality of said apertures.
Claim 6
Dependent Claim
139 words
An apparatus as claimed in claim 1, wherein said first ferromagnetic member is slidably positioned at said first side surface of said permanent magnet between a first position whereat said end portion extends outwardly beyond said end surface of said permanent magnet and a second position whereat said end portion is located inwardly of said end surface of said permanent magnet, said hook portion includes an outer nonferromagnetic hooked member adapted to engage over and lock onto said end portion of said first ferromagnetic member when said first ferromagnetic member is in said first position thereof, and further comprising a release member insertable into said chamber for pushing said first ferromagnetic member from said first position thereof to said second position thereof to thereby release engagement of said hooked member from said end portion of said first ferromagnetic member.
Claim 7
Dependent Claim
27 words
An apparatus as claimed in claim 5, wherein the area of said first ferromagnetic member adjacent said end portion is less than at the opposite end thereof.
Claim 8
Dependent Claim
43 words
An apparatus as claimed in claim 5, wherein said end portion of said first ferromagnetic member has therein a cutout edge into which fits said hooked portion of said second ferromagnetic member when said first ferromagnetic member is in said first position thereof.
Claim 9
Dependent Claim
55 words
An apparatus as claimed in claim 1, wherein said end portion of said first ferromagnetic member has thereon a first retaining member for attachment to an article, such as a belt, and said second ferromagnetic member, on an end thereof opposite from said hook portion, has a second retaining member for attachment to such article.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |