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US3333217A - Crossbar switch with magnetic latching - Google Patents

Crossbar switch with magnetic latching Download PDF

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Publication number
US3333217A
US3333217A US417019A US41701964A US3333217A US 3333217 A US3333217 A US 3333217A US 417019 A US417019 A US 417019A US 41701964 A US41701964 A US 41701964A US 3333217 A US3333217 A US 3333217A
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US
United States
Prior art keywords
bar
springs
magnets
bars
contact
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
US417019A
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English (en)
Inventor
Gaugain Emile Paul Maurice
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.)
International Standard Electric Corp
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 US3333217A publication Critical patent/US3333217A/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
    • H01H67/26—Co-ordinate-type selector switches not having relays at cross-points but involving mechanical movement, e.g. cross-bar switch, code-bar switch

Definitions

  • each electrical contact consists in a wire or a flat spring embedded in the selecting bar and bearing a permanent magnet.
  • Each bar is submitted to a motion of translation in one direction when its selection electro-magnet is energized and in the opposite direction when said electro-magnet is de-energized.
  • the contact springs are so shaped that the two magnets of each crosspoint are in a same plane parallel to the planes of the bars and that, when both bars move under the control of their electro-magnets, the permanent magnets stick together, the contact springs touch and remain in contact. The contact is broken when only one bar moves under the control of its electro-magnets as the magnets slide along each other.
  • the present invention concerns crossbar multiselectors in which the simultaneous displacement of one row bar and one column bar closes one or more electrical contacts and holds them in position by magnetic latching.
  • Crossbar multiselectors or crossbar switches, have been described in numerous publications, as, for instance, in the June 1954 issue of Electrical Communications, and their design and mode of realization are well known.
  • Such a switch has n'horizontal selecting bars and p vertical selecting bars which cross at right angles and which define np crosspoints.
  • a stack of contacts is associated with each of these crosspoints in such a way that the contacts close when the horizontal bar and the vertical bar passing by this point are displaced successively, and that they remain closed when the horizontal bar resumes itsoriginal position.
  • each selecting bar is submitted to a motion of translation under the control of its electromagnet and the electrical contacts are made up of contact springs or of flat springs attached to the bar by one of their ends.
  • Each of the springs bears a permanent magnet which ensures the magnetic latching of a crosspoint whose two bars have been energized.
  • a multiselector operates in the following way:
  • This invention has therefore the object of realizing a crossbar multiselector wherein the contacts are held closed by magnetic latching.
  • Another object of the invention consists in realizing a multiselector of reduced size and weight.
  • BIG. 1 represents a crosspoint equipped with contact springs.
  • FIGS. 2.1, 2.2 and 2.3 show projections of the contact springs and of their magnets in the median plane for various positions of the selecting bars.
  • FIGS. 3.1 and 3.2 show a particular mode of realization of spring wires.
  • FIG. 4 shows the crosspoint equipped with fiat springs.
  • FIG. 1 represents, in a perspective view, the region of space relative to a'crosspoint defined in relation to the system of rectangular coordinates 0 x, 0 y, 0 2,.
  • the two selecting bars passing by this point will be called, respectively: column bar and row bar.
  • a selection (not shown) associated with each bar imparts a translation movement to said bar when it is energized.
  • this electro-magnet is dc-energized, the bar returns to its original position, or rest position under the action of a return spring (not shown).
  • the column bar is displaced along the axis 0 y in the direction of arrow V' when its electro-magnet is energized.
  • a spring wire A E C F G rigidly fastened to this bar at point A, carries, on its part E 0 a permanent magnet M whose poles are referred to as N and S.
  • the row bar moves along the axis 0 x, in the direction of arrow H, and carries a spring wire A E C F G to which a permanent magnet M is fastened.
  • the magnets are fastened to the springs by means, for example, of an insulating moulded part which encloses these two elements.
  • Each of the springs whose position at the embedding point is defined by the angles a and B, is bent in three points referenced, for the spring v for instance, C B
  • the bending at E is such that the magnet M is placed in the median plane and that its greatest dimension is parallel to the bissectrix ID, of the angle yOIxO.
  • the bendings at C and F are such that the part E G of the spring remains in the median phase and the part F G of this spring comes in contact with the homologous part F G of the spring h when the electro-magnets of the two bars are simultaneously energized, the contact line being merged with the bissectrix 1D,.
  • the magnets M and M are fastened to the springs v and h in such a way that, at each crosspoint, the poles which face each other are of opposite polarity.
  • FIGS. 2.1, 2.2 and 2.3 show, for various positions of the selecting bars, the projection of the springs and of their magnets in the median plane.
  • FIG. 2.1 represents this projection when none of the electro-magnets is energized and thus corresponds to FIG. 1.
  • FIG. 2.2 represents this projection when the electromagnet connected to the bar V is energized.
  • FIG. 2.3 represents this projection when the two electromagnets are energized simultaneously (parts A E and A 13 of the springs represented by unbroken line) and released simultaneously (parts A E and A E of the springs represented by dotted line).
  • All contact springs embedded on the same bar are multiplexed on a connection conductor so that, when contact is made between a spring v and a spring h, a connection is made between the connection conductors to which these springs are connected.
  • FIGS. 3.1 and 3.2 thus by way of a non-limitative example a mode of realization of the contacts in which a point contact takes place on the bissectrix ID, of the angle xOIyO.
  • FIG. 3.1 shows the projection of the springs and of their magnets on the median plane and FIG. 3.2 shows the projection of these elements on a vertical plane z'A' xO containing the part C G of the spring v and the segment A A as defined in FIG. 1.
  • FIG. 3.1 it is seen that the projections of the extremities G and G of the two springs do not cross, in rest position, the bissectrix ID
  • FIG. 3.2 it is seen that the end of a spring, the end C F G of spring v, for instance, is bent in the form of a V and that the points F and G are placed symmetrically with respect to the median plane.
  • the springs v and it touch, on the bissectrix ID only when the two electro-magnets are energized simultaneously.
  • the embedding points of the contacts on the verticals A A and A A' (FIG. 1) must then be spaced in such a way that the springs belonging to adjacent pairs of contacts do not touch during the displacement of only one of the bars.
  • FIG. 4 shows, in perspective view, the elements of a crosspoint equipped with flat springs.
  • the axes of coordinates and the contacts have the same references as in FIG 1.
  • the bend at E is such that the plane of part E G of the flat spring is parallel to the bissectrix plane (vertical plane containing the bissectrix ID and that its longitudinal axis is in the median plane.
  • a crossbar multiselector including a row selecting bar and a column selecting bar, each bar lying in a separate horizontal plane, each bar having a direction of motion along an axis perpendicular to that of the other bar, a crosspoint defined bysaid bars, electrical contact means including a pair of electrical contacts which close in response to simultaneous displacement of the row bar and the column bar associated with the crosspoint, magnetic means associated with each electrical contact for holding said electrical contacts closed by magnetic latching action in response to simultaneous displacement of' each selecting bar, said magnetic means releasing said electrical contacts in response to displacement of only one selecting bar.
  • a crossbar multiselector in which the electrical contact means include a contact spring embedded in each bar at a distance d from a perpendicular common to the two bars associated with a given crosspoint, the embedding point being placed so that said distance a' decreases when a bar is displaced in the direction to close said contacts and the magnetic latchingmeans include a permanent magnet attached to each contact spring, said spring being so bent that, first the magnet lies in a plane placed at the half-distance between the two horizontal planes, and second, the parallel sides of the two magnets attached to the springs pertaining to a crosspoint are separated by such a distance that they do no react upon each other, the facing magnetic poles being of opposite names.

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  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
US417019A 1963-12-20 1964-12-09 Crossbar switch with magnetic latching Expired - Lifetime US3333217A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR958046A FR1390265A (fr) 1963-12-20 1963-12-20 Multisélecteur à verrouillage magnétique

Publications (1)

Publication Number Publication Date
US3333217A true US3333217A (en) 1967-07-25

Family

ID=8819435

Family Applications (1)

Application Number Title Priority Date Filing Date
US417019A Expired - Lifetime US3333217A (en) 1963-12-20 1964-12-09 Crossbar switch with magnetic latching

Country Status (5)

Country Link
US (1) US3333217A (xx)
CH (1) CH422065A (xx)
FR (1) FR1390265A (xx)
NL (1) NL6414918A (xx)
SE (1) SE326732B (xx)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1567532A (en) * 1924-07-03 1925-12-29 Siemens Ag Telephone switch
DE1188224B (de) * 1954-09-22 1965-03-04 Deutsche Bundespost Kontaktanordnung fuer schaltende Kontakte in Schwachstromkreisen mit magnetisch erzeugter Haltekraft fuer die Kontakte

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1567532A (en) * 1924-07-03 1925-12-29 Siemens Ag Telephone switch
DE1188224B (de) * 1954-09-22 1965-03-04 Deutsche Bundespost Kontaktanordnung fuer schaltende Kontakte in Schwachstromkreisen mit magnetisch erzeugter Haltekraft fuer die Kontakte

Also Published As

Publication number Publication date
CH422065A (de) 1966-10-15
SE326732B (xx) 1970-08-03
FR1390265A (fr) 1965-02-26
NL6414918A (xx) 1965-06-21

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