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US3594669A - Control device for reed switch - Google Patents

Control device for reed switch Download PDF

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Publication number
US3594669A
US3594669A US846355A US3594669DA US3594669A US 3594669 A US3594669 A US 3594669A US 846355 A US846355 A US 846355A US 3594669D A US3594669D A US 3594669DA US 3594669 A US3594669 A US 3594669A
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US
United States
Prior art keywords
magnets
magnet
disc
reed switch
contact strips
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
US846355A
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English (en)
Inventor
Mitsunori Yamane
Masayuki Hayashi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Application granted granted Critical
Publication of US3594669A publication Critical patent/US3594669A/en
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
    • H01H67/00—Electrically-operated selector switches
    • H01H67/22—Switches without multi-position wipers
    • H01H67/32—Switches without multi-position wipers having a multiplicity of interdependent armatures operated in succession by a single coil and each controlling one contact or set of contacts, e.g. counting relay
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits

Definitions

  • This invention relates in general to a pulse-generating device, and more particularly to improvements in a pulsegenerating device suitable for use with a read out counter system.
  • the device could previously include a magnetic reed switch comprising a pair of reed-shaped contact strips, one of which has a stationary permanent magnet disposed in the proximity thereto and the other of which has a movable iron pi'ece'movable toward and away from the same.
  • the movement of the movable iron piece toward and away from the other iron contact strip causes the closing and opening of a magnetic circuit composed of the permanent magnet, the contact strips and a magnetic support for the switch thereby to control the operation of the switch to produce pulses.
  • the repeated opening and closing of the magnetic circuit has been controlled only by the movable iron piece, movable toward and away from the other contact strip, so that a remanence may remain on the movable iron piece, and on the contact strips etc.
  • a leakage flux due to the permanent magnet close to the one contact strip may form a magnetic circuit extending through components (for example, the support for the contact strip) other than the movable iron piece. Therefore it has been disadvantageous in that the separation of the movable iron piece from the other contact strip may not lead to a fool-proof opening of the read switch.
  • a pulse-generating device including a new and improved magnetic read switch including a pair of reed-shaped contact strips which provide a highly reliable device.
  • a pulse-generating device comprising a rotary substrate, permanent magnet means disposed on the substrate, and a magnetic reed switch fixedly disposed above the substrate and including a pair of resilient reed-shaped contact strips
  • the permanent magnet means include a plurality of permanent magnets disposed at predetermined angular intervals on the substrate and substantially on a circle having the center lying on the axis of rotation of the latter, and that the magnetic reed switch lies opposed to a path along which the pole face of each of the permanent magnets is moved as the substrate is rotated, the pair of resilient reedshaped contact strips being contacted by each other through magnetic attraction when the strips face a pair of pole faces dissimilar in polarity and separated away from each other through magnetic repulsion when the strips face a pair of pole faces similar in polarity.
  • each permanent magnet may have one pole face fixedly securedto the substrate and its other pole face capable of facing the magnetic reed switch, said magnets having a predetermined pattern of polarity distribution.
  • the permanent magnet means may include at least three permanent magnets, a first one of the magnets hav ing the pole face fixed to one substrate and of opposite polarity the corresponding pole faces of the second and third magnets fixed to the substrate wherein a first pair of adjacent pole faces with similar polarity are disposed between a second pair of pole faces having polarities opposite to those of said first pair.
  • FIG. I is a schematic front view of a pulse-generating device constructed in accordance with the principles of the invention and incorporated into a read out counter;
  • FIG. 2 is a schematic rear view of the device illustrated in FIG. 1;
  • FIG. 3 is a schematic perspective view of the ing unit shown in FIGS. 1 and 2;
  • FIG. 4 is an elevational view of the unit shown in FIG. 3.
  • an arrangement disclosed herein comprises an electromagnet generally designated by the reference numeral 10 including an electromagnetic coil 12 and a movable iron piece or armature I4.
  • the coil 12 is adapted to be intermittently energized with input pulses dependent upon an electric quantity measured for example by a wattmeter (not shown).
  • the armature 14 is operatively connected to a springloaded feed claw 16 which is, in turn, operatively coupled to a digit dial IS in the conventional manner.
  • the digit dial I8 has disposed on the outer periphery the digits of 0, I, 2, 9 at substantially equal angular intervals in the named order.
  • the armature I4 is attracted by the electromagnet I0 to step the digit dial 18 in the direction of the arrow shown in FIG. I through the feed claw 16.
  • the digit dial I8 has fixedly extending through the center thereof a rotary shaft 20 which is, in turn, provided with a circular substrate 22 on that portion of the shaft thereof remote from the feed claw, said substrate being formed of any suitable magnetic material such as iron for rotation with the digit dial 18.
  • the circular substrate 22 is provided on its exposed surface with a plurality of permanent magnets 24 disposed at substantially predetermined angular intervals on a circle having its center lying on the axis of rotation of the substrate with one pole of each magnet fixedly secured to the exposed substrate surface.
  • the permanent magnets 24 are positioned between the associated digits on the dial l8 and have substantially the same angular intervals as the digits. As clearly shown in FIGS.
  • the embodiment illustrated includes four permanent magnets 24a, b, c and d the outermost two 240 and d of which have their respective S pole faces fixedly secured to the substrate 18, the remaining or intennediate magnets 24b and c having their respective N pole faces fixedly secured to the substrate for the purpose as will be made apparent hereinafter. That is, the first magnet has one pole face fixed to the substrate, which one pole face is opposite in polarity to those pole faces of the second and third magnets fixed to the substrate while the fourth magnet is oriented similar to the first magnet.
  • a magnetic reed switch generally designated by the reference numeral 26 is suitably disposed above the exposed surface of the substrate 18, and in slightly spaced relationship with respect to the permanent magnets 24, at its position where it opposes a path along which the free pole face of each magnet is moved during the rotational movement of the substrate 18.
  • the switch 26 includes an enclosed elongated envelope 28 having a length sufficient to bridge any pair of adjacent permanent magnets 24, a pair of reed-shaped contact strips 30 and 32 of any suitable resilient and magnetic material such as iron sealed through the opposite ends of the envelope 28, with the inner end portions within the envelope overlapping each other to form a narrow gap therebetween.
  • the contact strips may have their surfaces plated with any suitable conductivematerial and may have their outer ends disposed outside the envelope 28, so that they are adapted to be electrically connected to any suitable external circuit (not shown).
  • a further rotation of the substrate 18 will cause the permanent magnets 24b and c of the same polarity to be put directly below the reed switch 26.
  • the N pole faces of the magnets 24b and c face the contact reads 30 and 32 to exert a magnetic repulsion upon both strips thereby to forcedly separate them from each other even though the 1 remanence due to the previous contacting thereof still retains.
  • the reed switch 28 leaves the last or fourth magnet 24d and is reopened. Thereafter the reed switch 26 reaches the first and second permanent magnets 24a and b whereupon the process as above described is repeated to provide pulses in succession.
  • a circuit (not shown) connected to the reed switch 28 provides one pulse each time the digit dial 18 reaches its position corresponding to each. of the digits 1 and 3.
  • the invention provides a pulse-generating device in which a pair of permanent magnets, dissimilar in polarity, are caused to move toward and face the associated reed switch to close the switch through magnetic attraction, and then another pair of permanent magnets similar in polarity, are caused to move toward and face the same switch to open it through magnetic repulsion, whereby the switch is repeatedly closed and opened.
  • This measure ensures that the device can produce pulses without any malfunction often performed by the conventional devices.
  • FIGS. 1 and 2 or 3 and 4 may include three permanent magnets 24a, b and 0 whereby the reed switch 26 can be repeatedly and successively put in its closed and open positions.
  • the permanent magnets 24a, b and 0 With more than four of the permanent magnets used, pairs of adjacent magnets having their pole faces fixed to the substrate in a polarity orientation opposite to the first-described pairs.
  • the reed switch 26 may have operatively associated therewith two sets of three permanent magnets similar to the set of permanent magnets 24a, b and c and spaced away from each other, whereby the reed switch is successively put in its closed, open, closed and open modes of operation, with the first open mode and second closed mode of operation having a pulse pause interval for which the digit dial is successively stepped.
  • a plurality of reed switches may be disposed at different radial distances from the center of the substrate, with each switch operatively associated one or more sets of permanent magnets such as previously described.
  • a reed switch control device comprising a rotatable disc, at least three permanent magnets disposed on said disc along a circle concentric with an axis of rotation of said disc, wherein each of said magnets has one pole directed outwardly of said disc, and a reed switch mounted adjacent said disc and having a pair of resilient reed-shaped contact strips of magnetic material engageable by and disengageable from each other in response to positioning of said permanent magnets, wherein said magnets include a first said magnet having a second and a third said magnet disposed on opposing sides thereof and spaced equally therefrom so that when said first magnet is disposed adjacent one of said contact strips, one of said second and third magnets is disposed adjacent the other said contact strips, and wherein said outwardly directed poles of said first and second magnets are of opposing polarities and said outwardly directed poles of said first and third magnets have the same polarity, whereby rotation of said disc causes said first and second magnets to attract and close said contact strips, and further rotation of said
  • a reed switch control device as set forth in claim I comprising a fourth permanent magnet disposed on said concentric circle and spaced from said third magnet a distance equal to the distance between said first and third magnets, said outwardly directed pole of said fourth magnet having a polarity opposing that of said third magnet pole, whereby further rotation of said disc causes said third and fourth magnets to attract and close said contact strips.
  • a reed switch control device as set forth in claim 1, in which said disc comprises a magnetic material.

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  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
US846355A 1968-08-07 1969-07-31 Control device for reed switch Expired - Lifetime US3594669A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5595668 1968-08-07

Publications (1)

Publication Number Publication Date
US3594669A true US3594669A (en) 1971-07-20

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ID=13013511

Family Applications (1)

Application Number Title Priority Date Filing Date
US846355A Expired - Lifetime US3594669A (en) 1968-08-07 1969-07-31 Control device for reed switch

Country Status (3)

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US (1) US3594669A (de)
DE (1) DE1940257B2 (de)
GB (1) GB1224093A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824513A (en) * 1973-04-16 1974-07-16 Ibm Position indication apparatus
US4041427A (en) * 1975-04-15 1977-08-09 Futaba Denshi Kogyo K. K. Reed switching opening and closing device
US4061901A (en) * 1976-08-19 1977-12-06 Thiokol Corporation Telemetering system
US4144568A (en) * 1976-09-17 1979-03-13 Hiller Alexander J Exercise recorder
US4981453A (en) * 1989-03-31 1991-01-01 Litton Systems, Inc. Emergency transmitter buoy and bracket assembly

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2929896A (en) * 1958-09-23 1960-03-22 Ronning Adolph Circuit controller
US3233060A (en) * 1962-07-12 1966-02-01 Wintriss George Magnetically operated electric circuit control apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2929896A (en) * 1958-09-23 1960-03-22 Ronning Adolph Circuit controller
US3233060A (en) * 1962-07-12 1966-02-01 Wintriss George Magnetically operated electric circuit control apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824513A (en) * 1973-04-16 1974-07-16 Ibm Position indication apparatus
US4041427A (en) * 1975-04-15 1977-08-09 Futaba Denshi Kogyo K. K. Reed switching opening and closing device
US4061901A (en) * 1976-08-19 1977-12-06 Thiokol Corporation Telemetering system
US4144568A (en) * 1976-09-17 1979-03-13 Hiller Alexander J Exercise recorder
US4981453A (en) * 1989-03-31 1991-01-01 Litton Systems, Inc. Emergency transmitter buoy and bracket assembly

Also Published As

Publication number Publication date
DE1940257A1 (de) 1970-02-26
DE1940257B2 (de) 1971-09-02
GB1224093A (en) 1971-03-03

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