IL37571A

IL37571A - Improvements relating to electrical switch devices

Info

Publication number: IL37571A
Application number: IL37571A
Authority: IL
Original assignee: Communications Patents Ltd
Priority date: 1970-08-28
Filing date: 1971-08-24
Publication date: 1974-09-10
Also published as: IL37571A0; CH532834A; CA950012A; SE388500B; US3721929A; FR2112204A1; ES200696Y; ES200696U; BE771854A; DE2142340A1; ZA715663B; GB1354501A; AU3270071A; NL7111747A; FR2112204B1; MTP703B; AU463747B2

Description

IMPROVEMENTS IN AND RELATING TO ELECTRICAL SWITCH DEVICES This invention relates to electrical switches of the kind described and claimed in our application number and seeks to provide an improved form It is an object of the present invention to provide means whereby a switch of the kind specified may selectively be rendered ineffective in one or more of its Accordingly the invention provides 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 each side of the reed switch element thereby simultaneously to provide both electrostatic and magnetic screening for said reed switch element and a control means associated with at least one reed switch element whereby the magnetic actuation of said element is According to one specific feature of the invention the control means is formed by a magnetically permeable member associated with the reed switch element to form a magnetic so preventing actuation of its contacts by the operating According to a further specific feature of the invention the control means is formed by an auxiliary reed arranged electrically in series with the reed switch said auxiliary reed being operable by a magnetic member associated Conveniently the magnetic member is a permanently magnetised member arranged to be releasably positioned on or adjacent said auxiliary In British Patent 1 007 833 and 1 059 340 there are disclosed electrical switching devices consisting of an array of sealed magnetic contact units spaced from each other by elements and of a magnet mounted to be rotatably movable into proximity with said magnetic contacts so as to effect sequential operation neither of the British Patents teaches or suggests the use of control means associated with at least one reed switch element whereby the magnetic actuation of said element is rendered In order that the invention may be more readily understood two particular embodiments thereof will now be by way of example with reference to the accompanying drawings in which Figure 1 is a view of one embodiment of a switch device in accordance with the present and Figure 2 is a schematic diagram of another embodiment of an electrical switch device in accordance with the present In the switch shown in Figure 1 a plurality of magnetically operable reed switch elements 1 are disposed in corresponding channels of conductive each channel including two magnetically permeable members 2 arranged one on each side of the reed switch element and associated with a member of magnetically permeable conductive material formed by a sheet of copper which is bonded to one face of a sheet of insulating Conveniently the members may be formed from a printed circuit The magnetically permeable members 2 are secured in the insulating material by means of portions 5 thereof which extend through corresponding apertures in the members and which are suitably deformed so as to thereafter prevent their It will be noted that each magnetically permeable member 2 comprises a pair of of magnetisable material and each member is common to the channels associated with adjacent ones of the reed switch elements The reed switch elements 1 are actuable by a permanent magnet 6 carried by a movable arm 7 which serves to position the magnet 6 over that reed switch element which is desired to be actuated at any particular In practice the reed switch elements 1 and magnetically permeable members 2 are arranged to extend readily from a common the arm 7 being pivoted on an axis passing through said centre and totatable over the reed switch elements elements in order to render ineffective the magnetic actuation said The control means comprises a bridge of magnetically permeable material releasably engaged in the channel defined between two the members 2 and forms a shield which prevents actuation of the contacts of the reed switch element concerned by the In practice the bridge 8 or a plurality thereof may be manually associated with one or of the reed switch When these elements together form a programme selection switch corresponding to a particular scriber in a wired hroadcasting system that subscriber may be denied certain of the available If at any time the subscriber is to be permitted to receive one of the denied programmes the bridge 8 is simply removed the channel housing the reed switch element corresponding to that programme so as to restore its normal In the arrangement shown in Figure 2 reed switch elements 10 of the kind shown in Figure 1 are arranged to be actuated by a movable magnet such as the magnet 6 shown in Figure Actuation of one of the reed switch elements 10 serves to establish a circuit path between one of the input terminals 11 and the output terminals 12 from which a subscriber of a wired broadcasting system may derive selected programme Resistors serve as isolating impedances to prevent undue interference to other subscribers of the system in the event of a fault occuring associated with the subscriber connected to the terminals Arranged electrically in series with each of the reed switch elements 10 is an auxiliary reed the contacts of which are normally In order to deny to the subscriber deriving programme signals from the terminals 12 one or more of the programmes applied to the input terminals 11 the appropriate auxiliary reed may have placed on or adjacent thereto a magnet member the magnetic field of which serves to actuate the auxiliary reed so opening its It 10 associated with that programme are closed upon his selection thereof no programme signals will pass to the output terminals 12 whilst the contacts of the auxiliary reed are The magnet member 15 is arranged to releasably positioned on or adjacent the desired auxiliary reed Ik by means for example of a clip fitted thereto which may be engaged with the body of an auxiliary reed Again it is a simple matter to permit a subscriber to receive a denied programme simply by unclipping the magnet member 15 from the auxiliary reed 1 It will be appreicated further that the auciliary reeda Ik may be actuated by electromagnets and that in this case control of the actuation thereof may be effected automatically insufficientOCRQuality

Claims

WHAT WE CLAIM IS

1. An electrical switch device comprising a plurality of magnotically operable reed switch elements each of which is disposed in a channel of conductive material which includes two magnetically permeable members arranged one each side of the reed switch element thereby simultaneously to provide both electrostatic and electromagnetic screening for said reed switch element and a control means associated with at least one reed switch element whereby the magnetic actuation of said element is rendered ineffective.

2. An electrical switch device as claimed in claim 1, 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.

3. An electrical switch device as claimed in claim 2, wherein said control means comprises a bridge of magnetically permeable material releasably engaged in the channel defined between said two magnetically permeable members.

4. An electrical switch device as claimed in claim 1, wherein the control means comprises an auxiliary reed arranged electrically in series with the reed switch element, said auxiliary reed being operable by a magnetic member associated therewith.

5. An electrical switch device as claimed in claim ^ , wherein the magnetic member is permanently magnetised member arranged to be releasably positioned on or adjacent said auxiliary reed.

6. An electrical switch device as claimed in claim wherein the magnetic member comprises an electro magnet.

7. An electrical switch device substantially as described with