Patent US3741860A successfully refreshed from Google Patents.
Patent US3639869A successfully refreshed from Google Patents.
US3639869A
Expired / Lapsed
US
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Magnetically latched switch assembly
Assignee: Singer Co
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Filing: 1971-03-03
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Granted: 1972-02-01
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Expires: 1991-03-03
Abstract
Abstract A magnetically latched switch assembly including a reed switch mounted on a baseplate adjacent a biasing magnet, whose field strength and orientation are sufficient to hold the reed switch actuated but insufficient to independently actuate the switch. A LATCH magnet and a RELEASE magnet are separately mounted on a pair of reciprocating key stems, the former with magnetic poles opposing, the latter with magnetic poles assisting, the field associated with the biasing magnet. Movement of the LATCH magnet into proximity with the biasing magnet concentrates the field associated with the latter in the switch, closing the switch, which is subsequently held actuated by the latter. Movement of the RELEASE magnet into proximity with the biasing magnet reduces the field associated with the latter in the switch, opening the switch.
Inventors
- 👤 Egon A Pedersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:08
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/70; H01H13/72; H01H36/00; H01H36/0073
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
144 words
A magnetically latched switch assembly comprising: a magnetically operable switch having a magnetic switching threshold and a magnetic holding threshold less than said switching threshold; a biasing magnet having a first pair of magnetic poles disposed adjacent said switch for providing a first constructed magnetic field in the immediate vicinity of said switch whose magnitude lies between said switching and said holding threshold; a second magnet having a second pair of magnetic poles movable into field opposing relation with said biasing magnet for concentrating said first field in said immediate vicinity to a magnitude above said switching threshold to thereby actuate said switch; and a third magnet having a third pair of magnetic poles movable into field assisting relation with said biasing magnet for diminishing said first field in said immediate vicinity to a magnitude below said holding threshold to thereby deactuate said switch.
Claim 2
Dependent Claim
144 words
A magnetically latched switch assembly comprising: a magnetically operable switch having a magnetic switching threshold and a magnetic holding threshold less than said switching threshold; a biasing magnet having a first pair of magnetic poles disposed adjacent said switch for providing a first constructed magnetic field in the immediate vicinity of said switch whose magnitude lies between said switching and said holding threshold; a second magnet having a second pair of magnetic poles movable into field opposing relation with said biasing magnet for concentrating said first field in said immediate vicinity to a magnitude above said switching threshold to thereby actuate said switch; and a third magnet having a third pair of magnetic poles movable into field assisting relation with said biasing magnet for diminishing said first field in said immediate vicinity to a magnitude below said holding threshold to thereby deactuate said switch.
Claim 3
Dependent Claim
22 words
The apparatus of claim 1 further including a baseplate for mounting said biasing magnet and said switch in spaced, substantially parallel relation.
Claim 4
Dependent Claim
15 words
The apparatus of claim 2 wherein said baseplate is c nstructed from a nonmagnetic material.
Claim 5
Dependent Claim
67 words
The apparatus of claim 2 further including first and second key assemblies mounted for reciprocal motion in a direction substantially normal to said baseplate; each said assembly comprising a key stem having a transverse groove adapted to receive one of said second and third magnets; a key top mounted on one end of said stem; and bias means for biasing said key assembly toward a nonactuated position.
Claim 6
Dependent Claim
26 words
The apparatus of claim 4 wherein said baseplate is provided with a pair of apertures for guiding the lower portion of each of said key stems.
Claim 7
Dependent Claim
34 words
The apparatus of claim 4 further including a mounting plate disposed above said baseplate and provided with a pair of apertures adapted to slidably receive the upper portion of each of said key stems.
Claim 8
Dependent Claim
21 words
The apparatus of claim 6 wherein said bias means comprises a spring disposed between said key top and said mounting plate.
Claim 9
Dependent Claim
22 words
The apparatus of claim 4 wherein said second and third magnets are mounted in said switch assembly in axially aligned, spaced relation.
Claim 10
Dependent Claim
44 words
The apparatus of claim 4 wherein each of said second and third magnets is mounted for reciprocable motion of the longitudinal axis thereof in a plane substantially normal to said baseplate and lying between the longitudinal axes of saiD switch and said biasing magnet.
Claim 11
Dependent Claim
156 words
A magnetically latched switch assembly comprising: first and second magnetically operable switches disposed in spaced, substantially parallel relation, each said switch having a magnetic switching threshold and a magnetic holding threshold less than said switching threshold; a biasing magnet having a first pair of magnetic poles disposed between said switches for providing a first magnetic field in the immediate vicinity of each of said switches whose magnitude lies between said switching and said holding thresholds; a second magnet having a second pair of magnetic poles movable into field opposing relation with said biasing magnet for concentrating said first field in said immediate vicinity to a magnitude above said switching thresholds to thereby actuate said switches; and a third magnet having a third pair of magnetic poles movable into field assisting relation with said biasing magnet for diminishing said first field in said immediate vicinity to a magnitude below said holding thresholds to thereby deactuate said switches.
Claim 12
Dependent Claim
156 words
A magnetically latched switch assembly comprising: first and second magnetically operable switches disposed in spaced, substantially parallel relation, each said switch having a magnetic switching threshold and a magnetic holding threshold less than said switching threshold; a biasing magnet having a first pair of magnetic poles disposed between said switches for providing a first magnetic field in the immediate vicinity of each of said switches whose magnitude lies between said switching and said holding thresholds; a second magnet having a second pair of magnetic poles movable into field opposing relation with said biasing magnet for concentrating said first field in said immediate vicinity to a magnitude above said switching thresholds to thereby actuate said switches; and a third magnet having a third pair of magnetic poles movable into field assisting relation with said biasing magnet for diminishing said first field in said immediate vicinity to a magnitude below said holding thresholds to thereby deactuate said switches.
Claim 13
Dependent Claim
23 words
The apparatus of claim 10 wherein said first and second switches have substantially identical magnetic switching thresholds and substantially identical magnetic holding thresholds.
References Cited (Backward Citations)
US3260819A
Cited
US3319128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |