US2718559A - Cross-bar switch - Google Patents

Cross-bar switch Download PDF

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Publication number
US2718559A
US2718559A US251272A US25127251A US2718559A US 2718559 A US2718559 A US 2718559A US 251272 A US251272 A US 251272A US 25127251 A US25127251 A US 25127251A US 2718559 A US2718559 A US 2718559A
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US
United States
Prior art keywords
bar
contact
conductors
selecting
operating
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
US251272A
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English (en)
Inventor
Lundkvist Karl Axel
Wiberg Eric Axel
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of US2718559A publication Critical patent/US2718559A/en
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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

  • the selecting device is of the cross-bar switch type with sets of contact strips crossing each other or other conductors arranged in two parallel planes, a front one and a back one, within a frame.
  • a selecting bar For each one of the sets of contact strips in the front plane there is a selecting bar and an electromagnet actuating said selecting bar so that the set is marked for connection with a set of contact strips or conductors in the back plane.
  • an operating bar For each one of the sets of contact strips in the back plane there is an operating bar and an electromagnet actuating said operating oar, whereby the contact strips of the set are connected with each one of the contact strips in a set of contact strips in the front plane marked by a selecting bar.
  • each detachable unit comprising a set of conductors and the conductors mounted on one side of said frame crossing the conductors mounted on the opposite side of the frame, and by arranging contact springs at each crossing point which are selected by the Selecting bar and operated by the operating bar of the crossing point, and which are fixed to the conductors in one of the detachable units and when operated make contact with the conductors in the other detachable unit in the crossing point.
  • a further advantage achieved by the invention is that the selecting bars are placed between two planes in which the contact strips lie, which entails, that the contact points lie in front of the selecting bars instead of behind them as in most other cross-bar switches, the contact points thereby being easily accessible for inspection and cleanmg.
  • each selecting bar with its electromagnet can be combined with the contact strips corresponding to the selecting bar to form a detachable selecting unit, similarly to What has already been usual earlier with regard to the operating bars.
  • Fig. 1A is showing the principle for a cross-bar switch according to one embodiment of the invention.
  • Fig. 1B is showing a corner of the same cross-bar switch completed with some essential details.
  • Figs. 2-3 and Figs. 11-12 show details and different embodiments of the vertical detachable units in 'Figs. lA-B.
  • Fig. 4 is showing a cross-bar switch according to a second embodiment of the invention.
  • Figs. 510 show details and different embodiments of the vertical detachable units in Fig. 4.
  • a frame 1 is the body of the crossbar switch in Fig. 1A.
  • Each vertical set comprises three contact strips insulated from each other and provided with soldering tails 20.
  • a contact pin 9 extends from each one of said strips at each crossing point with an operating bar, for example 5b.
  • the support is made of insulating material.
  • An angle 19 is at its top fastened to the support.
  • the vertical contact strips and the support are joined for example by means of screws or rivets, glued or cast with moulding material, and fastened at their bottom to the yoke of an electromagnet 10.
  • a selecting bar con? sisting of a fiat strip .1 is fixed to or is a portion of the armature of the electromagnet 10 and is turnably mounted in the angle 19 and the yoke of the electromagnet.
  • the contact strips are joined by means of blocks 15, 16, 17 of insulating material and provided with tongues 6 at each crossing point with a selecting bar such as shown at 11.
  • the contact strips 3 are provided with soldering tails 21.
  • the yoke of an electromagnet 4 is fixed to the block 15.
  • the operating bar 511 consists of a rigid strip, which is provided with a lever 2 for each crossing point between the operating bar and a selecting bar 11.
  • the free end of the wire is provided with a plate 13, which is for example painted white to be easily visible.
  • the resilient tongues 6 pertaining to the same crossing point are connected to a driver 12 of insulating material.
  • the function of the cross-bar switch corresponds wholly to the function of a normal cross-bar switch with individual spring sets at each crossing point.
  • a line connected to the soldering tails 20 is marked by the electromagnet 10 being energized, attracting its armature and revolving the selecting bar 11.
  • the wire 7 is thereby conveyed below the driver 12 and above the lever 2.
  • the line connected to the soldering tails 21 is selected by electromagnet 4 being energized, attracting its armature 5a and revolving the operating bar 5b.
  • the wire 7 is thereby pressed between the lever 2 and the driver 12 and the tongues 6 are lifted and make contact with the contact pins 9.
  • the selecting magnet 10 can then release its armature and the wire 7 remains pressed between lever and driver.
  • the lever 2 will swing up behind the driver 12 without touching it. Simultaneously, the wire 7 is con veyed up beside the driver 12. Should then the selecting bar 11 be revolved by the electromagnet 10, the wire 7 will rest against the side of the driver 12 and be bent.
  • the plate 13 is normally hidden by the contact strips 8 and the supporting rib 14, but when it is conveyed below the driver 12 it becomes visible from the front and indicates, that the crossing point has been marked.
  • the invention is not limited to whole contact strips as in the example described above.
  • the vertical contact strips may thus be exchanged for soldering fields with rows of contact pins connected with vertical multiple connections, and the horizontal contact strips may be replaced by loose spring assemblies connected with horizontal connections of for example smooth wire.
  • Other equivalent means may also be used without the idea of the invention being set aside.
  • a selecting bar is used for each vertical set of conductors, but each selecting bar may naturally be common for two sets, as is usual with conventional cross-bar switches. The selecting bar is thereby actuated by two electromagnets, by which it is turned in one or the other direction from an intermediate position.
  • the two kinds of detachable units which are mounted on opposite sides of a frame, have determined positions relatively each other, so that the contact springs, which have to make contact between the conductors in the different units, determine the contact distance in relation to the fixed contacts of the conductors.
  • the conductors on one side must further be provided with contact pieces corresponding to said contact springs.
  • Fig. 1B shows a corner of a cross-bar switch where a vertical and a horizontal set of conductors cross each other in a frame 1.
  • the vertical conductors 8 are fixed to a supporting bar 14 and provided with contact pieces 9, which will be more closely described below with reference to Figs. 23.
  • the horizontal conductors 3 are located in grooves in a strip of insulating material, which in its turn is fastened to a supporting bar 22. From the supporting bar 22 a lever 22a protrudes at each crossing point for the horizontal conductors 3.
  • the lever 22a rests in a groove 140 in the supporting bar for the vertical conductors 8 and supports the lifting bar 12 for the contact springs 6, which protrude from the conductors 3.
  • the lifting bar 12 further rests against a lifting spring 23a, the front part of which is bent down right outside the tip of the lever 2 on the operating bar 5b.
  • An indicating device consisting of a resilient metal-wire 7 is fastened on the operating bar 5b and runs in parallel with the lever 2 between said lever and the supporting bar 14.
  • the vertical supporting bar 14 with conductors 8 is pertaining to a selecting bar 11 and its electromagnet, both bars forming together a unit.
  • the shape of the supporting bar appears from Fig. 2.
  • the conductors 8 are located in vertical grooves. At each crossing point for a conductor 8 there is a window 14a and a contact piece 9 according to Fig. 3.
  • the contact piece 9 is angular and one of its legs is on its upper side covered with a plate of insulating material 9a.
  • the contact pieces 9 are passing through square holes in the supporting bar 14, each one being on the same level with one of the windows 14a.
  • the conductors 8 are provided with a bending at each window 14a, so that they come into contact with the corresponding contact piece 9 and can be soldered to said piece.
  • the supporting bar is Warm-pressed so that the grooves are filled and the upper end of the conductors are steadily fixed.
  • the supporting bar 14 is further provided with a bracket 14d supporting the selecting bar 11, and a groove at each crossing point for guiding the lever 22a in Fig. 1B.
  • the selecting bar 11 is threaded through a hole in the bracket 14a.
  • the contact springs 6 in Fig. 1B are bent so that they stretch downwards and hang onto the lifting bar 12, which in its turn hangs onto the lever 22a.
  • the lifting spring 23a is bent upwards so that it easily presses against the lifting bar 12.
  • the position of the contact springs will thus at rest be deter mined by the lever 22a, which is rigid, but however allows small movement upwards or downwards, when it is pressed down into the groove 140 on the supporting bar 14.
  • the contact pieces 9 have fixed positions with relation to the groove 14c, and therefore determined contact distances are obtained between the springs 6 and the contact pieces 9.
  • the selecting bar 11 is provided with a bending 11a at each crossing point, which actuates the indicating device 7 when the selecting bar is turned, so that said device is introduced between the lever 2 of the operating bar and the lifting spring 2312.
  • the indicating device 7 is squeezed and the springs 6 lifted so, that they come into contact with the contact pieces 9.
  • FIGs. 1l-l2 Another embodiment is shown in Figs. 1l-l2.
  • the vertical conductors 8 consist of bands with cuttings and bendings 9 on one edge.
  • the bands are united at some distance from each other by means of strips of moulding material, in which there are grooves 14c for guiding the lever 22a in Fig. 1B.
  • the vertical set of conductors 8 is in this case somewhat flexible, and therefore the lever 22 sets the contacts 9 sidewise when guided into the groove 140.
  • the contact springs are fastened to the horizontal conductors as in Fig. 1B. It is however obvious that they may quite as well be fastened to the vertical conductors without the scope of the invention being departed from.
  • Fig. 1A the contact springs are fastened to the horizontal conductors as in Fig. 1B. It is however obvious that they may quite as well be fastened to the vertical conductors without the scope of the invention being departed from.
  • Fig. 1A the contact springs are fastened to the horizontal conductors
  • the conductors 8 are thin bands of metal, from which the contact springs 6 have been cut and bent. Said bands of metal are separated by means of insulating layers and fastened on a supporting bar 14 of insulating material.
  • a lever 22 and an indicating device 7 are fastened on the supporting bar 14 at each crossing point. The lever 22 supports the lifting bar 12, against which the contact springs 6 are resting. The contact springs 6 are bent so, that they stretch downwards.
  • the horizontal conductors 3 are bands of metal stretched in the strip 17, one for each crossing point.
  • Each strip has a groove 17a, in which the tip of a lever 22 is guided so, that the contact distances between the conductors 3 and the contact springs 6 are fixed.
  • the lever 22 as the conductors 3 allow a spring sufficient for fixing. Since in this case the indicating device 7 is fastened on the supporting bar 14, the lever 22 should be rigid and the spring should take place in the band 3 so, that the indicating device 7 can be adjusted before the vertical unit, which also comprises the selecting bar 11 and its magnet 15 being fastened in the frame 1.
  • Figs. 5-10 show two other embodiments for the vertical supporting bars 14 with contact springs 6 and conductors 8.
  • the conductors 8 are divided into several sets 6a, each of which pertains to a contact spring 6 as shown in Fig. 7.
  • the contact springs 6 are located in the supporting bar 14 and the connections 6a are bent downwards or upwards at one of their flanges and soldered to a corresponding contact spring pertaining to the following crossing point on the other flange.
  • the supporting bar 14 is provided with a U-shaped section and with a transversal groove in the two flanges for contact springs. In the space between the flanges there is enough place to locate several connections 6a running in parallel,
  • the contact springs 6 being considerably narrower at the middle of the supporting bar 14 than at the flanges.
  • each crossing point there is a lever 22 above the contact springs 6.
  • the contact springs 6 hitch in grooves in the lifting bar 12 and stretch downwards.
  • the lifting bar 12 rests against the lever 22.
  • Each contact spring 6 is provided with a soldering ear 20 and therefore the number of contact spring sets connected together thereby can vary.
  • Figs. 8-9 show another embodiment, in which a U- shaped supporting bar is also used.
  • the vertical conductors 8 are in one piece and soldered to the contact spring 6 at the window 14a in the middle of the supporting bar.
  • a special bracket 19 for fastening the selecting bar 11 in Fig. 4 is shown as well in Fig. 8 as in Fig. 5, but is not shown in Fig. 6 and Fig. 9.
  • Fig. shows recesses in the frame 1 for guiding and fastening the supporting bars 14 in Fig. 5 and Fig. 8.
  • a cross-bar switch for automatic telephone systems, a frame, at least one vertical detachable unit arranged on one side of said frame, at least one horizontal detachable unit arranged on the opposite side of said frame, said vertical unit comprising a set of fixed vertical conductors, a selecting bar and a selecting magnet operating said bar, said horizontal unit comprising a set of fixed horizontal conductors, an operating bar and an operating magnet operating said operating bar, contact springs protruding from the conductors in said vertical units at a crossing point between a vertical and a horizontal unit, an indicating device in said vertical unit, a driver fixed to said contact springs, said indicating device being deflected by said selecting bar of the crossing point when said selecting magnet is energized and clutching said driver to the operating bar of the crossing point said driver actuating said contact springs when said operating bar is operated by said operating magnet, and said contact springs bringing each conductor in the vertical unit in contact with a conductor in the horizontal unit at the crossing point.
  • a cross-bar switch a frame, a first set of fixed parallel conductors mounted at one side of said frame, a second set of fixed parallel conductors mounted at the opposite side of said frame, said first and said second sets of conductors crossing each other, a selecting bar adjacent and parallel to said first set, an operating bar adjacent and parallel to said second set, a selecting magnet for operating said selecting bar, an operating magnet for operating said operating bar, contact springs protruding from one set of conductors at a crossing point, an indicating device, a driver, said indicating device being deflected by the selecting bar of the crossing point and clutching said driver to the operating bar of the crossing point, said driver actuating said contact springs when the selecting bar and thereafter the operating bar of the crossing point are operated, said contact springs bringing each, conductor in one set at the crossing point in contact with one of the conductors in the other set, and each set of conductors on at least one side of the frame and its associated bar and magnet constituting a separate detachable unit.
  • a frame vertical detachable units arranged on one side of said frame, horizontal detachable units arranged on the opposite side of said frame, each of said vertical units comprising a set of fixed vertical conductors, a selecting bar and a selecting magnet operating said bar, each of said horizontal units comprising a set of fixed horizontal conductors, an operating bar and an operating magnet operating said operating bar, at each crossing point between a vertical and a horizontal unit contact springs protruding from the conductors in one of said units, an indicating device, and a driver operating said contact springs, said indicating device being deflected by said selecting bar of the crossing point when said selecting magnet is energized and clutching said driver to the operating bar of the crossing point, said driver when clutched to the operating bar actuating the contact springs of the crossing point, when said operating bar is operated by said operating magnet, and said contact springs bringing each conductor in the vertical unit in contact with a conductor in the horizontal unit at the crossing point.
  • a cross-bar switch including a lever protruding from each detachable unit on one side of the frame at each crossing point, said driver in the inoperative position resting against said lever and a free end of said contact springs resting against said driver, and said lever fixing the position of said contact springs in relation to the position of the conductors crossing the unit at the crossing point.
  • said vertical detachable units comprise the said contact springs, indicating device and driver at the crossing points and a lever adapted to fix the position of the said conductors in the horizontal units in relation to the position of the contact springs at the crossing points.

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  • Structure Of Telephone Exchanges (AREA)
  • Contacts (AREA)
  • Toys (AREA)
US251272A 1950-10-23 1951-10-15 Cross-bar switch Expired - Lifetime US2718559A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE316977X 1950-10-23
SE290651X 1951-06-29

Publications (1)

Publication Number Publication Date
US2718559A true US2718559A (en) 1955-09-20

Family

ID=26656222

Family Applications (1)

Application Number Title Priority Date Filing Date
US251272A Expired - Lifetime US2718559A (en) 1950-10-23 1951-10-15 Cross-bar switch

Country Status (7)

Country Link
US (1) US2718559A (de)
BE (1) BE506582A (de)
CH (1) CH316977A (de)
DE (1) DE881958C (de)
FR (1) FR1048642A (de)
GB (1) GB698383A (de)
NL (1) NL75662C (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2816173A (en) * 1953-03-04 1957-12-10 Ericsson Telefon Ab L M Device of open-wire multiple conductors
US2909613A (en) * 1954-11-30 1959-10-20 Itt Flat-bank crossbar switch
US2936340A (en) * 1955-04-06 1960-05-10 Int Standard Electric Corp Multi-contact arrangement for multi-switches
US2964591A (en) * 1955-10-04 1960-12-13 Itt Coordinate switching system
US3460076A (en) * 1967-12-06 1969-08-05 Karl Axel Lundkvist Crossbar switching device for use in automatic telephone systems
US3678422A (en) * 1971-07-29 1972-07-18 Gte Automatic Electric Lab Inc Miniature crossbar switch
US4138197A (en) * 1975-12-22 1979-02-06 National Controls, Inc. Key actuator
US4141658A (en) * 1977-06-29 1979-02-27 Ricca Tom L Attachment for remote control of a keyboard

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE962986C (de) * 1955-05-13 1957-05-02 Standard Elek K Ag Anzeigeeinrichtung zur Kennzeichnung der Einstellung von Kreuzschienenschaltern in Fernmelde-, insbesondere Fernsprechanlagen
DE1083340B (de) * 1955-09-20 1960-06-15 Sven Arnold Karlsson Dipl Ing Schaltungsanordnung zur Herstellung von Verbindungen in Fernmelde-, insbesondere Fernsprech-anlagen
US9669810B2 (en) 2012-01-10 2017-06-06 Honeywell International Inc. Brake assembly including independently activatable brake actuators

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB521004A (en) * 1938-11-08 1940-05-09 Frans Van Laethem Improvements in or relating to selector switch banks
US2226666A (en) * 1937-12-21 1940-12-31 Ericsson Telefon Ab L M Selector multiples
US2341029A (en) * 1942-07-01 1944-02-08 Bell Telephone Labor Inc Switching mechanism

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2226666A (en) * 1937-12-21 1940-12-31 Ericsson Telefon Ab L M Selector multiples
GB521004A (en) * 1938-11-08 1940-05-09 Frans Van Laethem Improvements in or relating to selector switch banks
US2341029A (en) * 1942-07-01 1944-02-08 Bell Telephone Labor Inc Switching mechanism

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2816173A (en) * 1953-03-04 1957-12-10 Ericsson Telefon Ab L M Device of open-wire multiple conductors
US2909613A (en) * 1954-11-30 1959-10-20 Itt Flat-bank crossbar switch
US2936340A (en) * 1955-04-06 1960-05-10 Int Standard Electric Corp Multi-contact arrangement for multi-switches
US2964591A (en) * 1955-10-04 1960-12-13 Itt Coordinate switching system
US3460076A (en) * 1967-12-06 1969-08-05 Karl Axel Lundkvist Crossbar switching device for use in automatic telephone systems
US3678422A (en) * 1971-07-29 1972-07-18 Gte Automatic Electric Lab Inc Miniature crossbar switch
US4138197A (en) * 1975-12-22 1979-02-06 National Controls, Inc. Key actuator
US4141658A (en) * 1977-06-29 1979-02-27 Ricca Tom L Attachment for remote control of a keyboard

Also Published As

Publication number Publication date
CH316977A (de) 1956-10-31
DE881958C (de) 1953-07-06
BE506582A (de)
FR1048642A (fr) 1953-12-23
NL75662C (de)
GB698383A (en) 1953-10-14

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