US4577427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display
Assignee: Dayco Products Canada Inc
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Filing: 1984-05-14
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Granted: 1986-03-25
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Expires: 2004-05-14
Abstract
Abstract A magnet operated display or indicator device selectably displays one of two faces of a disk. The disk is stopped in each limiting position by a stop contacting the disk inboard of its edge to another aspect the magnet is offset relative to the pivot axis of the disc to give better starting torques. In another aspect, where a plurality of disks are in columns, the pivot axes are stepped to be parallel but not coaxial.
Inventors
- 👤 John Browne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:42
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/30; G09F9/37; G09F9/375
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
140 words
Display or indicator device comprising: a plurality of pivotally mounted discs contrastingly coloured on opposite sides each carrying a permanent magnet defining a magnetic axis transverse to the pivot axis, magnetic field forming means exterior to the disc and arranged to provide a selectably reversible field causing rotation of the disc about the pivot axis to cause the display of one or of the other face of the disc in a predetermined viewing direction, characterized by: a frame designed to pivotally mount a row of such discs, the pivotal axis for each element being substantially contained in a plane parallel to said viewing direction and parallel the longitudinal direction of said row, each said pivotal axis being inclined at substantially the same relative angle to the longitudinal direction of said row, said relative angle being of the order of 3°-10°.
Claim 2
Dependent Claim
140 words
Display or indicator device comprising: a plurality of pivotally mounted discs contrastingly coloured on opposite sides each carrying a permanent magnet defining a magnetic axis transverse to the pivot axis, magnetic field forming means exterior to the disc and arranged to provide a selectably reversible field causing rotation of the disc about the pivot axis to cause the display of one or of the other face of the disc in a predetermined viewing direction, characterized by: a frame designed to pivotally mount a row of such discs, the pivotal axis for each element being substantially contained in a plane parallel to said viewing direction and parallel the longitudinal direction of said row, each said pivotal axis being inclined at substantially the same relative angle to the longitudinal direction of said row, said relative angle being of the order of 3°-10°.
Claim 3
Dependent Claim
67 words
Display or indicator as claimed in claim 1 wherein said disks are provided with pivot shafts extending from opposed ends of said disks for pivotal mounting in said frame, and said frame providing means between adjacent disks in a row defining bearing walls for the shafts of such adjacent disks, the bearing wells for adjacent disks being laterally displaced from each other relative to the row direction.
Claim 4
Dependent Claim
24 words
Display or indicating device as claimed in claim 2 wherein said disks are longer in the axial direction than in the direction transverse thereto.
Claim 5
Dependent Claim
55 words
Display or indicating device as claimed in claim 2 wherein the longitudinal direction of said row is substantially vertical and said magnet is assymetrically located relative to said pivotal axis and the disk is heavier on the side of the pivotal axis corresponding to the side where the magnet is closest to the disk edge.
Claim 6
Dependent Claim
24 words
Display or indicating device as claimed in claim 1 wherein said disks are longer in the axial direction than in the direction transverse thereto.
Claim 7
Dependent Claim
33 words
Display or indicating device as claimed in claim 1 wherein said disc is composed of three laminations and said magnet is dimensioned to be received in the middle laminated layer of the disc.
Claim 8
Dependent Claim
55 words
Display or indicating device as claimed in claim 1 wherein the longitudinal direction of said row is substantially vertical and said magnet is assymetrically located relative to said pivotal axis and the disk is heavier on the side of the pivotal axis corresponding to the side where the magnet is closest to the disk edge.
References Cited (Backward Citations)
CA771356A
Cited
US3140553A
Cited
US3295238A
Cited
US3942274A
Cited
US4178575A
Cited
US4383255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-24 | 1989-09-23 | 1990-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-24 | 1993-09-23 | 1994-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-24 | 1997-09-23 | 1998-03-25 | $7700.00 | Window Closed / Lapsed |