US3721929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical switch devices
Assignee: Communications Patents Ltd
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Filing: 1971-08-26
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Granted: 1973-03-20
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Expires: 1991-08-26
Abstract
Abstract Magnetic reed switches are mounted side-by-side in a switching array operable from a moving magnet and located in a channel of conductive material and magnetic members to provide electromagnetic and electrostatic shielding and a magnetic bridge member is used to inactivate selected ones of the switches.
Inventors
- 👤 R Gabriel
- 👤 R Kinross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:22
CPC Classifications
H; H01; H01H; H01H36/00; H01H36/0006; H01H36/006
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
An electrical switch device comprising a plurality of magnetically operable reed switch elements each of which is disposed in a channel of conductive material which includes two magnetically permeable members arranged one on each side of the reed switch element thereby simultaneously to provide both electrostatic and electromagnetic screening for said reed switch element, magnetic means selectively positionable adjacent to said elements to actuate magnetically any one of said switch elements when adjacent thereto, and a control means associated with at least one reed switch element whereby the magnetic actuation of said at least one element by said magnetic means is rendered ineffective, wherein the control means comprises a magnetically permeable member asSociated with the reed switch element to form a magnetic shield so preventing actuation of its contacts by the operating magnet.
Claim 2
Dependent Claim
133 words
An electrical switch device comprising a plurality of magnetically operable reed switch elements each of which is disposed in a channel of conductive material which includes two magnetically permeable members arranged one on each side of the reed switch element thereby simultaneously to provide both electrostatic and electromagnetic screening for said reed switch element, magnetic means selectively positionable adjacent to said elements to actuate magnetically any one of said switch elements when adjacent thereto, and a control means associated with at least one reed switch element whereby the magnetic actuation of said at least one element by said magnetic means is rendered ineffective, wherein the control means comprises a magnetically permeable member asSociated with the reed switch element to form a magnetic shield so preventing actuation of its contacts by the operating magnet.
Claim 3
Dependent Claim
32 words
An electrical switch device as claimed in claim 1, wherein said control means comprises a bridge of magnetically permeable material releasably engaged in the channel defined between said two magnetically permeable members.
Claim 4
Dependent Claim
72 words
In an electrical switch device with a plurality of magnetic reed switches scanned in sequence by switch operating magnet means, control means to render ineffective selectively single ones of said switches when scanned by said magnetic means, comprising in combination, control means comprising a removable member of magnetic material stationarily positionable selectively in a position associated with said single switch to render ineffective said single switch when scanned by said magnetic means.
Claim 5
Dependent Claim
72 words
In an electrical switch device with a plurality of magnetic reed switches scanned in sequence by switch operating magnet means, control means to render ineffective selectively single ones of said switches when scanned by said magnetic means, comprising in combination, control means comprising a removable member of magnetic material stationarily positionable selectively in a position associated with said single switch to render ineffective said single switch when scanned by said magnetic means.
Claim 6
Dependent Claim
26 words
An electrical switch device as claimed in claim 3 wherein said removable member comprises a magnetic shield interspersed between said magnetic means and said single switch
Claim 7
Dependent Claim
41 words
An electrical switch device as claimed in claim 1, wherein said control means comprises said magnetic member and an auxiliary reed arranged electrically in series with the reed switch element, said auxiliary reed being operable by a magnetic member associated therewith.
Claim 8
Dependent Claim
27 words
An electrical switch device as claimed in claim 5, wherein the magnetic member is a permanently magnetized member arranged to be releasably positioned adjacent said auxiliary reed.
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |