US3533029A - Keyboard with reed contacts - Google Patents

Keyboard with reed contacts Download PDF

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Publication number
US3533029A
US3533029A US660964A US3533029DA US3533029A US 3533029 A US3533029 A US 3533029A US 660964 A US660964 A US 660964A US 3533029D A US3533029D A US 3533029DA US 3533029 A US3533029 A US 3533029A
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US
United States
Prior art keywords
permanent magnets
reed contacts
key
reed
contacts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US660964A
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English (en)
Inventor
Heinz Steinbach
Andreas Zerfass
Gerhard Wessel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent NV
Original Assignee
International Standard Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US3533029A publication Critical patent/US3533029A/en
Assigned to ALCATEL N.V., DE LAIRESSESTRAAT 153, 1075 HK AMSTERDAM, THE NETHERLANDS, A CORP OF THE NETHERLANDS reassignment ALCATEL N.V., DE LAIRESSESTRAAT 153, 1075 HK AMSTERDAM, THE NETHERLANDS, A CORP OF THE NETHERLANDS ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INTERNATIONAL STANDARD ELECTRIC CORPORATION, A CORP OF DE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/0006—Permanent magnet actuating reed switches
    • H01H36/004—Permanent magnet actuating reed switches push-button-operated, e.g. for keyboards
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/23—Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof

Definitions

  • the invention relates to a circuit arrangement, or keyboard, with reed contacts which are actuated by movable axially polarized permanent magnets. It relates particularly to key-dialling facilities in telecommunication systems or other information-processing systems.
  • an arrangement comprising a plurality of keys in which at the key bodies, arranged like a matrix, one or several permanent magnets are provided, preferably arranged at an angle of 90 towards each other.
  • the associated permanent magnets are shifted in the longitudinal direction thereby actuating those reed contacts which are closest to the key body.
  • a switching facility having several keys and permanent magnet-actuated reed contacts in which in the recesses of flux guiding pieces of the magnetic circuit permanent magnets are fixed to the keys.
  • the keys are movable and are plunged into the recesses or apertures when they are present.
  • the permanent magnets are magnetized so that the magnetic field of a mobile permanent magnet opposes the magnetic field of a fixed permanent magnet and applied to the flux pieces, so that a previously actuated feed contact opens and closes again when the mobile permanent magnet is removed.
  • reed contacts By using reed contacts, such key-controlled switching facilities show the advantage that they can also be used in explosion-endangered systems. If in such switching facilities or key panels the reed contacts are actuated by mobile permanent magnets, poled in the same direction, it occurs that the extraneous fields of the adjacent magnets interfere with the switching function of the reed contacts.
  • an object of the invention to avoid. this disadvantage of known switching facilities and to eliminate the interference of extraneous fields of the permanent magnets onto adjacent reed contacts in a key panel with such contacts, actuated by mobile, axially polarized permanent magnets.
  • This is achieved, according to the in-' vention, by polarization and by arranging and shaping the permanent magnets so that the permanent magnets of those reed contacts which can be reached by magnetic extraneous fields of adjacent permanent magnets, emit magnetic fields of such polarization, direction and intensity that the extraneous fields compensate each other.
  • a permanent magnet is associated with two or more reed contacts and the square-shaped permanent magnets have slotted holes for the reed contacts.
  • the short edges of the squareshaped permanent magnets are preferably rounded.
  • the permanent magnets can also be formed, according to a further feature of the invention, as oval-shaped magnets or may accommodate the reed contacts in lateral recesses.
  • the permanent magnets are turned around the key aXis at an angle of approximately 45 towards the position of the rows or columns respectively.
  • a switching facility or keyboard constructed in accordance with invention possesses various advantages.
  • By polarizing, arranging and shaping the permanent magnets according to the invention the functions of reed contacts are secured even with very close spacing of the individual elements without subjecting the reed contacts to interfering extraneous fields of adjacent permanent magnets.
  • FIG. 2 shows the key panel according to FIG. I, seen from the side
  • FIGS. 3 to 9 show further key panels according to the invention with different polarization, arrangement and shape of the permanent magnets, seen from the top.
  • FIG. 1 flat, square-shaped permanent magnets are designated with 1, each having two slotted holes 2 and 3 for the reed contacts 4.
  • the permanent magnets 1 are axially polarized i.e. in the direction of the key movement or the keyshaft 5 respectively and in the longitudinal direction of the reed contacts 4. Since the holes 2 and 3 of the permanent magnets 1 are slotted holes it is secured that, when using reed contacts 4 with ball-type armatures no preferably magnetized support can occur at one of the contacting elements melted into the reed tube.
  • the permanent magnets 1 are poled alternately in the opposite direction within the columns (vertical). This construction shows a substantial improvement compared to the arrangements of key panels known having permanent magnets which are poled in the same direction, because the interfering extraneous fields of the permanent magnets 1 partly compensate each other.
  • FIG. 2 shows the key panel in a side View. As shown here, contacts 4 are operated by each permanent magnet 1. The permanent magnets 1 are fastened to the key shafts 5 and are moved in the direction of the arrows 7 against the resetting force of springs 6.
  • FIG. 3 shows a key panel in which the individual permanent magnets 1 are turned around the axis of the key at an angle of approximately 45 with respect to the arrange of the rows or columns.
  • the short edges of the square-shaped permanent magnets 1 are rounded.
  • the permanent magnets 1 are poled as shown in the arrangement according to FIG. 1, i.e. the permanent magnets 1 are poled alternately in the opposite direction within the columns (vertical).
  • FIGS. 4 and 6 show key panels in which the arrangement and shape of the permanent magnets 1 correspond to the ones shown in FIG. 1.
  • the polarization is selected so that in FIG. 4 the permanent magnets 1 are alfgruately poled in the opposite direction within the rows (horizontal) and in FIG. 6 they are poled in the opposite direction alternately within the rows as well as within the columns.
  • the arrangement and the shape of the permanent magnets 1 correspond to the arrangement and shape shown in FIG. 3.
  • the permanent magnets 1 of the key panel shown in FIG. 5, however, are alternately poled in the opposite direction within the rows while the permanent magnets 1 of the key panel shown in FIG. 7 are alternately poled in the opposite direction within the rows and within the columns.
  • FIGS. 8 and 9 show further possible shapes of the permanent magnets 1 whereby the ones shown in FIG. 8 are oval-shaped and the permanent magnets shown in FIG. 9 accommodaate the reed contacts 4 in lateral recesses 8.
  • the arrangement of the permanent magnets and the shape of the magnets are selected so that there is with reference to the reed contacts of a key approximately the same distance between the adjacent magnets, poled in the opposite direction.
  • a switching device employing reed contacts actuated by axially polarized mobile permanent magnets for key-dialling facilities in telecommunication and other information-processing systems, wherein the improvement comprises:
  • said plurality of magnets including at least three magnets
  • each permanent magnet being poled in a direction opposite to at least one adjacent permanent magnet to provide a component of its magnetic field to cancel interfering components of magnetic field from the adjacent permanent magnet.
  • each permanent magnet is associated with two reed contacts and each magnet is square-shaped and has a hole prepared to receive each of the reed contacts.
  • a switching device in which selected edges of the square-shaped permanent magnets are rounded.
  • a switching device according to claim 2 in which the permanent magnets are oval-shaped.
  • a switching device in which the permanent magnets accommodate the reed contacts in lateral recesses.
  • a switching device in which the reed contacts are arranged in rows and columns and the permanent magnets are turned about axes through their centers at substantially an angle of relative to the rows and columns.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Push-Button Switches (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
US660964A 1966-08-24 1967-08-16 Keyboard with reed contacts Expired - Lifetime US3533029A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST025800 1966-08-24

Publications (1)

Publication Number Publication Date
US3533029A true US3533029A (en) 1970-10-06

Family

ID=7460714

Family Applications (1)

Application Number Title Priority Date Filing Date
US660964A Expired - Lifetime US3533029A (en) 1966-08-24 1967-08-16 Keyboard with reed contacts

Country Status (4)

Country Link
US (1) US3533029A (de)
CH (1) CH470064A (de)
DE (1) DE1590616B1 (de)
GB (1) GB1150787A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3598890A (en) * 1968-06-25 1971-08-10 Nippon Musical Instruments Mfg Electronic musical instrument with magneto-sensitive elements and movable permanent magnet providing glissando
US3622926A (en) * 1970-03-12 1971-11-23 George Risk Magnetically actuatable reed switch assembly
US3728652A (en) * 1969-07-18 1973-04-17 Canon Kk Ratus and arrangement thereof
US3972403A (en) * 1974-09-05 1976-08-03 Cyle Van Alstine Decoding means for use with a typewriter
USH43H (en) 1984-12-03 1986-04-01 Xerox Corporation Magnetic latch closure control

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3158710A (en) * 1962-01-29 1964-11-24 Stewart Warner Corp Code mechanism having a permanent magnet slidably received in an aperture in a magnetic member
US3233061A (en) * 1964-10-05 1966-02-01 Navigation Computer Corp Magnetically detented keyboard switch
US3273088A (en) * 1964-05-08 1966-09-13 Int Standard Electric Corp Relay with armature contacts, particularly reed contacts
US3283274A (en) * 1963-10-04 1966-11-01 Falco Angelo De Push button reed switch

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1130477B (de) * 1961-08-31 1962-05-30 Siemens Ag Mechanisch betaetigter Impulsgeber fuer Fernmelde-, insbesondere Fernsprechanlagen mit einem rotierenden Dauermagneten, dessen Feld auf einen Kontakt einwirkt

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3158710A (en) * 1962-01-29 1964-11-24 Stewart Warner Corp Code mechanism having a permanent magnet slidably received in an aperture in a magnetic member
US3283274A (en) * 1963-10-04 1966-11-01 Falco Angelo De Push button reed switch
US3273088A (en) * 1964-05-08 1966-09-13 Int Standard Electric Corp Relay with armature contacts, particularly reed contacts
US3233061A (en) * 1964-10-05 1966-02-01 Navigation Computer Corp Magnetically detented keyboard switch

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3598890A (en) * 1968-06-25 1971-08-10 Nippon Musical Instruments Mfg Electronic musical instrument with magneto-sensitive elements and movable permanent magnet providing glissando
US3728652A (en) * 1969-07-18 1973-04-17 Canon Kk Ratus and arrangement thereof
US3622926A (en) * 1970-03-12 1971-11-23 George Risk Magnetically actuatable reed switch assembly
US3972403A (en) * 1974-09-05 1976-08-03 Cyle Van Alstine Decoding means for use with a typewriter
USH43H (en) 1984-12-03 1986-04-01 Xerox Corporation Magnetic latch closure control

Also Published As

Publication number Publication date
GB1150787A (en) 1969-04-30
CH470064A (de) 1969-03-15
DE1590616B1 (de) 1971-04-29

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ALCATEL N.V., DE LAIRESSESTRAAT 153, 1075 HK AMSTE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL STANDARD ELECTRIC CORPORATION, A CORP OF DE;REEL/FRAME:004718/0023

Effective date: 19870311