Patent JPS53139501A successfully refreshed from Google Patents.
US3755938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graphmatic magnegraph
Assignee: Individual
•
Filing: 1971-06-14
•
Granted: 1973-09-04
•
Expires: 1991-06-14
Abstract
Abstract A visual display device has a pair of semirigid panels hingedly connected together along one edge and adapted to be folded into an overlapped and parallel position. The panels, when unfolded, are disposed with the inside surfaces of said panels facing outwardly. Magnetizable sheet means are provided having a substantially flat mounting surface, said magnetizable sheet means being secured to the inside surface of at least one of the panels so that the mounting surface faces outwardly from the panel. Releasable clamping means are also provided on the one sheet and is adapted to hold non-magnetic sheet means on the mounting surface. Magnetizable display members are provided with either the magnetizable sheet means or the magnetizable display members having a permanent magnet characteristic so that the display member will be magnetically attracted to the magnetizable sheet means.
Inventors
- 👤 A Bytwork
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:20
CPC Classifications
G; G09; G09F; G09F23/00; G09F23/14; G09F1/00; G09F1/10; G09F1/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
337 words
A foldable visual display device, comprising: an elongated rectangular element; first, second and third hinge means dividing said element into four mutually adjacent rigid panels, first and second ones of said panels being substantially equal in size and larger than each of the third and fourth ones of said panels, each of said panels being foldable relative to the other panel about said first, second and third hinge axes from a flat arrangement wherein each of said panels are parallel and overlapped to a position wherein said first and second panels define an inverted V-shape about said first hinge means, said third panel adjacent said second panel being foldable about said second hinge means to close the spacing between said first and second panels at the open end of said V-shape and thereby define a triangular arrangement, said fourth panel adjacent said third panel being foldable about said third hinge means to extend parallel with an inside surface portion of said first panel of said triangular arrangement and having means for effecting engagement of said third panel with said inside surface portion; a rectangular magnetized sheet and means for securing said magnetized sheet on at least one of said first or second panels and substantially coextensive therewith and on a side thereof facing outwardly of said triangular arrangement; and a plurality of elongated flaps, each of said flaps being attached adjacent one of said sides of said magnetized sheet, means for hingedly connecting each of said flaps to said one of said first or second panels along the line of attachment, each of said flaps being pivotal between positions out of parallel relation with said magnetized sheet and a position of parallel and overlying relation with said magnetized sheet, each of said flaps having a magnetizable portion therEon which is magnetically attracted to said magnetized sheet when said flaps are in said overlying relation to said magnetized sheet to effect a clamping action on a rectangular display sheet juxtaposed between said magnetized sheet and said elongated flaps.
Claim 2
Dependent Claim
337 words
A foldable visual display device, comprising: an elongated rectangular element; first, second and third hinge means dividing said element into four mutually adjacent rigid panels, first and second ones of said panels being substantially equal in size and larger than each of the third and fourth ones of said panels, each of said panels being foldable relative to the other panel about said first, second and third hinge axes from a flat arrangement wherein each of said panels are parallel and overlapped to a position wherein said first and second panels define an inverted V-shape about said first hinge means, said third panel adjacent said second panel being foldable about said second hinge means to close the spacing between said first and second panels at the open end of said V-shape and thereby define a triangular arrangement, said fourth panel adjacent said third panel being foldable about said third hinge means to extend parallel with an inside surface portion of said first panel of said triangular arrangement and having means for effecting engagement of said third panel with said inside surface portion; a rectangular magnetized sheet and means for securing said magnetized sheet on at least one of said first or second panels and substantially coextensive therewith and on a side thereof facing outwardly of said triangular arrangement; and a plurality of elongated flaps, each of said flaps being attached adjacent one of said sides of said magnetized sheet, means for hingedly connecting each of said flaps to said one of said first or second panels along the line of attachment, each of said flaps being pivotal between positions out of parallel relation with said magnetized sheet and a position of parallel and overlying relation with said magnetized sheet, each of said flaps having a magnetizable portion therEon which is magnetically attracted to said magnetized sheet when said flaps are in said overlying relation to said magnetized sheet to effect a clamping action on a rectangular display sheet juxtaposed between said magnetized sheet and said elongated flaps.
Claim 3
Dependent Claim
21 words
The visual display device according to claim 1, including at least one magnetizable display member magnetically attractable to said magnetized sheet.
Claim 4
Dependent Claim
76 words
A visual display device according to claim 2, wherein said magnetizable portion of each of said flaps comprise a strip of ferromagnetic material movable about the hinge means associated therewith into and out of major magnetic attraction with said magnetized sheet and spacer means mounted on said ferromagnetic strip on the side thereof remote from magnetized sheet to prevent a disturbance of said display member when said panels are folded in said overlapped and parallel position.
Claim 5
Dependent Claim
75 words
A visual display device according to claim 2, wherein said inside surface of said first panel includes a sheet of ferromagnetic material; and wherein said fourth panel has a permanently magnetized sheet thereon; whereby said permanently magnetized sheet on said fourth panel is magnetically attracted to said ferromagnetic sheet on said first panel and adapted to maintain said panels of said visual display device in said parallel and overlapping arrangement and in said triangular arrangement.
Claim 6
Dependent Claim
67 words
A visual display device according to claim 2, including further spacer means for spacing said magnetized sheet from said one of said panels to define a gap therebetween; and wherein said display member comprises an elongated flexible strip of ferromagnetic material, one end of said strip being received in said gap and the other end thereof being magnetically attracted to said magnetized sheet on said display sheet.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |