US3440581A - Means to through-connect and cancel the through-connection of crosspoints in a crossbar switch - Google Patents

Means to through-connect and cancel the through-connection of crosspoints in a crossbar switch Download PDF

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Publication number
US3440581A
US3440581A US569955A US3440581DA US3440581A US 3440581 A US3440581 A US 3440581A US 569955 A US569955 A US 569955A US 3440581D A US3440581D A US 3440581DA US 3440581 A US3440581 A US 3440581A
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United States
Prior art keywords
strap
spring
bar
selecting
contact
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Expired - Lifetime
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US569955A
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English (en)
Inventor
Kurt Strunk
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International Standard Electric Corp
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International Standard Electric Corp
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Filing date
Publication date
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Publication of US3440581A publication Critical patent/US3440581A/en
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    • 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

  • the invention relates, in more detail, to the establishment of through-connections or closures of crosspoints and to the cancellation of previously established connections of crosspoints. in a crossbar switch.
  • An exemplary switch for this purpose incorporates several selecting bars with marking springs and a plurality of holding bar armatures, several contact wires, and a number of contact spring sets for each selecting bar corresponding to the number of holding bar armatures.
  • the contact springs of the contact spring sets are located in a plane perpendicular to the plane of the contact wires, and each contact spring set contains a common follower element (strap).
  • crossbar switches which have in a common frame a number of vertically arranged holding bars (individual switches) which can take over within said frame different functions either individually or in groups, depending on the kind of systems.
  • a plurality of horizontal selecting bars are associated with the vertical holding bars and each selecting bar bears a number of marking springs, corresponding to the number of holding bars.
  • the bars are pivoted at their ends and can be tilted through their armatures when the respective selecting bar magnet is excited.
  • the marking springs are also tilted correspondingly, associated to each holding bar and fixed to the selecting bars.
  • the holding bar armatures have at the level of each selecting bar a recess into which protrude two guide straps of the contact springs.
  • the marking springs are located in the centre between the straps. If one of the two selector magnets of a selecting bar is excited the marking springs tilt upward or downward and engage the corresponding straps of the holding bars associated with them. If a holding bar magnet now responds the pertinent holding bar magnet presses the corresponding strap with the aid of the tilted marking springs, and, consequently, moves the contact springs of the respective crosspoint towards the contact wires of the terminating line. After the selecting bar magnet has been switched off, the selecting bar is returned to its non-operative position by a spring force. The marking spring kept by the holding bar does not follow this resetting of the selecting bar,
  • This arrangement causes a mechanical locking of the strap in its through-connected position, or releases said locking, respectively.
  • the selecting bar is tilted thereby causing the marking spring to engage the strap in a known
  • the holding bar armature is then pulled up to cause the strap to move over, to through-connect the contact springs and the contact wires and to mechanically lock the strap in this position,
  • the selecting bar is tilted in the direction of the mechanically locked strap to cause the marking spring to engage the strap
  • the selecting bar is tilted in the direction of the mechanically locked strap to cause the marking spring to engage the strap
  • a holding bar can be subdivided into several electrically independent switching elements. Consequently, the subdivision of a large switch into several small switch blocks is possible.
  • the present invention includes arrangements to carry out the steps described.
  • another spring 4 is associated with each pair of contact straps, in addition to the marking spring belonging to the armature.
  • This spring is also fixed to the selecting bar and engages, after actuation of the holding bar armature, into a recess of the contact strap marked in such a way that the actuated contact strap remains fixed after the holding bar armature has dropped and the selecting bar has returned to its original position.
  • an adhesive spring is associated with each individual contact strap, said spring not being fixed to the selecting bar.
  • Each spring touches, under mechanical bias, the pertinent contact strap and being actuated by an element firmly connected to the selecting bar engages, after through-connection of the strap during the restoration of the selecting bar, into a recess of the marked contact strap in such a way that the actuated contact strap remains fixed, after the holding bar armature has dropped.
  • FIG. 1 shows a portion of a crossbar switch according to the invention, not actuated
  • FIGS. 2 to 5 show steps to through-connect a crosspoint in the portion shown on FIG. 1,
  • FIGS. 6 to 9 show steps for releasing a through-connection of a pair of switch points, shown in FIG. 1,
  • FIG. 10 shows a portion of a crossbar switch according to the invention in which an adhesive spring is associated with each contact strap in a perspective view
  • FIG. 11 shows a known crossbar switch, schematically, and
  • FIG. 12 shows a possible crossbar switch, schematically when applying the principles of the present invention.
  • FIG. 1 shows crosspoints of a holding bar, marked by a selecting bar.
  • the contact straps 1' and 1" are marked by pressure of a marking spring 3 in a known way on the side of the holding bar armature.
  • another spring 4 is associated with each pair of straps fixed to the selecting bar (not shown on FIG. 1 of the drawing but see FIG. 10).
  • This spring 4 serves to mechanically lock the strap by contact with a recess 7 (FIG. 3).
  • Number 5 indicates the contact springs which penetrate through apertures of the straps and are located opposite to the contact wires 6.
  • Each useable crossbar switch will of course include a number of holding bar armat-ures, selecting bars and associated components.
  • FIG. 2 shows the first step of the method to throughconnect a switch point.
  • the selecting bar is tilted so that the marking spring 3 engages the strap 1'.
  • the spring 4 touches the strap 1' with a mechanical bias.
  • the holding bar armature 2 is pulled up to through-connect the strap 1 with the aid of the marking spring 3.
  • the spring 4 locks the strap 1 in its through-connected position by engaging the recess 7.
  • the contact springs 5 touch the contact wires 6.
  • the selecting bar is restored, and the marking spring 3 disengages from the strap 1. But the spring 4 remains clamped, locking the strap 1'.
  • the holding bar armature 2 is released and may be used to through-connect a crosspoint, associated with another selecting bar.
  • FIG. 6 shows the first step involved in releasing the through-connection of a crosspoint.
  • the selecting bar is tilted in the direction of the mechanically locked strap 1, so that the marking spring 3 engages the strap 1'.
  • the second step to release the through-connection is made, as shown in FIG. 7, by pulling-up the holding bar armature 2.
  • the selecting bar is tilted into its non-operative position, so that the spring 4 cancels the locking of the strap ll. But the marking spring 3 still remains clamped by the holding bar armature 2 having pulled up.
  • FIG. 10 shows an arrangement in which an adhesive" spring 4', 4" is associated with each individual contact strap 1', 1".
  • the selecting bar 9 is tilted in the direction of the strap to be through-connected, e.g., 1, whereby the marking spring 3 engages the strap.
  • the adhesive spring 4' touching the strap 1 under mechanical bias, is thereby pressed off by the actuating element 8.
  • the holding bar armature not shown on the drawing, has pulled up and the therefrom resulting through-connection of the strap 1 the selecting bar 9 is restored.
  • the marking spring 3 remains clamped by the pulled-up holding bar armature and the adhesive spring 4, can now engage into the aperture 7' of the strap 1', because it is no longer held off by the actuating element 8.
  • the marking spring 3 is released; but the strap 1 remains locked by the adhesive spring 4.
  • the selecting bar 9 is again tilted in the direction of the locked strap 1, where-by the marking spring 3 engages said strap and the actuating element 8 presses towards the adhesive spring 4'.
  • the adhesive spring 4' disengages from the aperture 7' of the strap 1'.
  • FIG. 11 shows schematically a crossbar switch as known hitherto, having no subdivision of the holding bars, e.g., 2, into several independent switching elements.
  • FIG. 12 shows a possibility to subdivide the holding bars of a crossbar switch, when applying the invention, e.g., into three individual switching elements 2, 2", 2.
  • a crossbar switch for connecting crosspoints and for cancelling connections of crosspoints comprising, a marking spring, an adhesive spring, a contact strap, a selecting bar rotatable to cause said marking spring and said adhesive spring to engage the contact strap, a holding bar, a pair of contact wires, a pair of contact springs, said contact strap being aligned perpendicular to a plane defined by the contact springs, said strap incorporating apertures through which the contact springs protrude and a recess into which the adhesive spring may fit, and said holding bar being movable to cause said adhesive spring to fit into the recess and to lock the contact strap in a fixed position, whereby dilferent actuating sequences of the selecting bar and of the holding bar [armature] may be used to efliect a change in the mechanical locking of the strap and connections between the contact springs and the contact wires.

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  • Push-Button Switches (AREA)
  • Mechanisms For Operating Contacts (AREA)
US569955A 1965-08-10 1966-08-03 Means to through-connect and cancel the through-connection of crosspoints in a crossbar switch Expired - Lifetime US3440581A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST024244 1965-08-10

Publications (1)

Publication Number Publication Date
US3440581A true US3440581A (en) 1969-04-22

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ID=7460028

Family Applications (1)

Application Number Title Priority Date Filing Date
US569955A Expired - Lifetime US3440581A (en) 1965-08-10 1966-08-03 Means to through-connect and cancel the through-connection of crosspoints in a crossbar switch

Country Status (5)

Country Link
US (1) US3440581A (de)
AT (1) AT286369B (de)
CH (1) CH466378A (de)
DE (1) DE1249939B (de)
ES (1) ES330115A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2337941A (en) * 1941-07-19 1943-12-28 Shepherd Judson O'd Switching mechanism
US2338181A (en) * 1942-06-20 1944-01-04 Bell Telephone Labor Inc Switching mechanism
US2339472A (en) * 1943-01-06 1944-01-18 Western Electric Co Selective switch
US3233050A (en) * 1961-07-05 1966-02-01 Mckee Automation Corp Cross bar switch with actuating pin structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2337941A (en) * 1941-07-19 1943-12-28 Shepherd Judson O'd Switching mechanism
US2338181A (en) * 1942-06-20 1944-01-04 Bell Telephone Labor Inc Switching mechanism
US2339472A (en) * 1943-01-06 1944-01-18 Western Electric Co Selective switch
US3233050A (en) * 1961-07-05 1966-02-01 Mckee Automation Corp Cross bar switch with actuating pin structure

Also Published As

Publication number Publication date
AT286369B (de) 1970-12-10
ES330115A1 (es) 1967-06-16
CH466378A (de) 1968-12-15
DE1249939B (de)

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