US3551631A - Miniature crossbar multiswitch - Google Patents

Miniature crossbar multiswitch Download PDF

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Publication number
US3551631A
US3551631A US720248A US3551631DA US3551631A US 3551631 A US3551631 A US 3551631A US 720248 A US720248 A US 720248A US 3551631D A US3551631D A US 3551631DA US 3551631 A US3551631 A US 3551631A
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US
United States
Prior art keywords
springs
mobile
connection
bars
spring
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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
US720248A
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English (en)
Inventor
Charles Vazquez
Guy Dufresnoy
Serge Maelstaf
Michel Barbaut
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Alcatel Lucent NV
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International Standard Electric Corp
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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
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Expired - Lifetime legal-status Critical Current

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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 present invention concerns Crossbar multiswitches and, more particularly, a multiswitch, the features of which, places it in the category of miniature equipments.
  • the object of the present invention is to design a miniature multiswitch of new conception, not necessitating any displacement of middle pieces or any particular adjustment.
  • One of the features of the invention concerns a miniature Crossbar multiswitch mainly constituted by:
  • a basic support composed of a printed circuit plate used also as support for a set of elastic mobile contact elements
  • each control bar a frame housing the said set of contact elements, two planes of control bars arranged orthogonally the ones in relation to the others, each bar including apertures ensuring the housing of the said mobile contact elements, two groups of coils respectively controlling the said bars, the restoring devices, of each control bar;
  • Another feature of .the invention relates to the fact that the multiswitch components are mounted on, a printed circuit plate on which are soldered the mobile contact elements, the mechanical holding and the electrical connection of the said multiswitch being done by the plugging of the said plate in a connector, such an arrangement enabling the simplification of the fixture means and the easy mounting of the said multiswitch in miniaturized equipments.
  • the frame includes four external walls delimiting the housing of the mobile contact elements, the walls comprising at their upper part as many studs are there are selection or connection bars, the said studs engaging in appropriate openings of the said bars in order to ensure their guiding.
  • Another feature of the invention relates to the fact that two of the external walls have a thickness sufficient to house elastic devices composed of springs acting upon return pieces the upper part of which engages openings provided for that purpose in the said bars.
  • the frame comprises a crossing constituted by two middle walls and a rear wall or plate increasing the rigidity of the said frame, the said walls serving as intermediate supports to the bars.
  • the rear plate includes as many holes as there are mobile contact elements to traverse the said plate, the said holes including a tapered part facilitating the simultaneous positioning of all the said elements in the said plate.
  • Another feature of the invention relates to the fact that the rear wall makes it possible to determine the fiexion point of the mobile contact elements at a predetermined distance of their fixing point onto the printed circuit.
  • Another feature of the invention relates to the fact that openings are provided in the sole of the frame along the walls in front of which are mounted the bar control coils, each opening ensuring the housing of an extremity of one armature of the said coils, the other extremity engaging in an appropriate cutaway of the corresponding control bar.
  • Another feature of the invention relates to the fact that all the parts provided for receiving the elements concerning the connection are located at a different level as comparedto the homologous elements concerning the selection, this difference of levels corresponding to the distance which ought to separate the planes in which are situated the connection and selection bars, such an arrangement enabling the control pieces of each type of bars to be identical.
  • the fixed spring support includes a set of grooves ensuring the housing of the fixed springs, a set of transversal slots the base of which is on the level of the upper part of the said fixed springs and a set of openings enabling the passage of the free end of the mobile contact elements and their guiding.
  • the lid comprises grooves allowing the free end of the mobile contact elements to move freely in the said lid'and ribs provided for being received in the slots of the fixed spring support in such a way that the face of the ribs be in contact with the upper part of the fixed contact elements at each crosspoint between the said ribs and the grooves of the support housing the fixed springs.
  • Another feature of the invention relates to the fact that the free end of each mobile contact element traverses the fixed spring support through an L-shaped guiding opening, the motion of the said element being thus orthogonal, at the establishment of a connection under the dependence of the connection and selection bars and at the release when the mobile contact element returns to its rest position, such an arrangement avoiding the wear of the driving teeth of the connection bar which would occur if the mobile contact element, at the release, described a trajectory other than that imposed by the said openings.
  • FIG. 10 a plan view ona large scale ofthefixed contact ele- 'ment support
  • FIG. 11 a sectional view, on a large scale taken alongthe longitudinal axis of a groove for housing the fixed contact elements; e 1
  • FIG. l2 a sectional view on alarge scale of the lid
  • FIGS. 13 to 16 schematic views-explaining the functionof the L-shaped openings of the fixed contact spring support
  • FIG. 17 a sectional view on a large scale of the frame and the rear wall.
  • FIG. l In which are represented the various multiswitch components.
  • the support is constituted by a double-sided printed circuit plate] bearing conducting wires on both faces.
  • the wirings such as 2 enable the establishment of. appropriate connections between soldering terminalareas such as 3 and certain pins of the plug-in part 4. They have only been partially drawn in the FIG, in order to avoid overburdeningit.
  • the plate [ is used as direct support of the mobile contact elernents -or springssuch as.5 which, for the same above-mentioned reasons, are
  • springs are deformable elastic elements having the aspect of a close-wound turn helicoid constituted by a metal wire of circular section and of good electrical conductivity.
  • Such a type. of spring has been described in the US. Pat. No. 3,396,257 which corresponds to a French patent which was originally filed in France on May 26, 1964.
  • the walls 8 and 11 have a greater thickness than the walls 9 and since they are provided-to house the mechanical-holding devices of the control bars. Such devices enable the holding of the established connection without any electrical power consumption and have been the object of the U5. Pat. application No. 673,791 filed on Oct. 9, 1967, and entitled: Miniature Crossbar Switch with Mechanical Latch.”
  • the springs 102 (FIG. 17) are pressure springs respectively located in housings such as 19, each housing being proper to a control bar. Each spring thus exerts on a return piece 20 a force which maintained it against the external edge of its housing 19;
  • The. extremity 103 of each return piece which is the only part visible in FIG. 1 engages the horizontal part 21 of the T opening 18 of the selection bar 12 is a frame 6 which is made of moulded hard plastic material or of the corresponding connection bar 13 (see FIGS. 2 and 1 3), which definitely positions the control bars.
  • a crossing constituted by the middle walls 22 ands23 ensures a better rigidity to the frame-and serves asintermediate support to the selection and connection. bars.
  • the wall 22 also includes studs 24 which engageslots25 of the; connection bars 13 (se'e -FIGIB) thus, bringing an addi wv'sm' i the'external walls extend on'bothtional guiding.
  • the terminals of the coils such as 33 are sufficiently long in i order to be connected to'the soldering terminal areas which are either found on the upper face of the plate 1 (soldering terminal areas 3) and allow the connection-of the selection I coils 27 or onthe lower face and ensure the 'solde'ringof the terminals 33 of the connectioncoils 28 which traverse the plate 1 through holes 34.
  • Only two armatures 97 (FIG. 17) of the selectioncoils are shown in theFlG. in order not to overburden it. They are identical for the connection coils and are worked in order to present a part which engages openings 35' (FIG. 17).
  • the position of the coils once mounted on the frame is such that the yoke 96 comes to contact them and that V its edge 104 (FIG. 17) constitutes the pivot'ing'axis of the arf.
  • connection bars and the selection bars are not positioned in the same plane. There results a difference of levels which corresponds to the distance between the two planes in which the bars operate.
  • Apertures such as 37 are provided in the angles formed by the abutment of the walls and are used to fix by selfstapping screws 48the fixed contact spring support 38 and the lid 39.
  • the fixed contact spring support 38 is constituted by a plate detailed in FIGS. 10 and 11; its length is such that the part of the spring external to the support 38 is sufficiently long in order that'it is. possible to solder its extremity onto a soldering terminal area of the lower face of the plate 1 corresponding to one of the holes 42.
  • the fixed contact spring support 38 also includes two series of slots 43 transversally positionedwith respect to grooves 41.
  • the slots 43 receive the ribs 44 of the lid 39 which ensures the holding of the fixed springs 40 in the bottom of their grooves.
  • the grooves 98 are provided for the passage and the guiding of the free end of each'of the mobile spring 5 (see details in FIGS. 10 and 11).
  • the support 38 is not exactly square and shows an extension in the part corresponding to grooves 45, 46 and 47.
  • This extension makes it possible to bring the fixed springs 40 perpendicularly to the holes 42 which are in relation with soldering terminal areas of the invisible face of the plate I, the end of springs 40 being then in a position which prevents them from interfering with the terminals 33 of the selection coils 27.
  • the lid 39 is made of transparent hard plastic material which enables to see, without disassembling, the active parts of the multiswitch. A detailed view of this lid is shown in'FIG. 12. Screws such as 48 traverse the holes 49 of the lid and the holes 50 of the support 38 in order to fix these elements onto the frame 6 by means of holes 37.
  • FIGS. 4 to 8 only represent parts of the selection bars 50 and 51 and a partial connection bar 52 in order to sim plify the drawing and the description. Besides, only the active part of the angle of the apertures 53 of the selection bars 12 (FIGS. I and 2) and the tooth 54, active parts of the openings of the connection bars 13 (FIGS. 1 and 3) have been kept.
  • FIG. 4 corresponds to the rest position of the selection and connection system.
  • the selection bars 50 and 51 ' are urged in the direction of the arrows F1 and F2 by their mechanical holding devices placed in the housings 19 of FIG. I, that is by the restoring springs which act by means of the armatures 20 upon the selection bars 12 through part 21 of their T openings 18 (FIG. 2).
  • the connection bar 52 is at rest urged in the direction of the arrow F3 by a device identical with that of the device urging selection bars '50 and 51; the armature submitted to the restoring spring acts upon the edge 21 of the opening 18 (FIG.
  • connection bar 52 When it is desired to establish a crosspoint, contrary to current practice in coordinate connection networks, the connection bar is moved before that of selection. As shown in FIG. 5, a current impulse applied to the electromagnet of the connection bar 52 causes the attraction of the armature against its core, the bar 52 being drawn in the direction of the arrow F4- against the restoring spring associated with the other end of the bar 52. At the end of its path, all the teeth, such as 55 and 56, of the bar 52 are disengaged from the corresponding mobile contact elements, such as 57 and 58 (bearing the reference 5 in FIG. 1).
  • FIG. 6 it is supposed that the selection bar chosen was the bar SI.
  • the selection bar 51 is moved in the direction of the arrow F5, driving the mobile contact spring 58 and leading it opposite the tooth 56 of the connection bar 52.
  • connection remains established between the fixed spring 59 and the mobile spring 58 although each of the electromagnets may no longer be fed; the particularity of this connection is that its holding does not necessitate electrical power consumption since it is ensured mechanically by the sole action of a spring acting upon the connection bar.
  • connection bar 52 To free the crosspoint, it is sufficient to apply an impulse to the electromagnet controlling the connection bar 52, in order that this bar be shifted in the direction of the arrow F4 and take the operating position shown in FIG. 5. From the fact of its own-elasticity and of the preferable inclination given by the mounting, the contact element 58 follows the bar in its displacement and, when it is found disengaged from the fixed contact 59, slides on the tooth 56 and comes to take up again its position in the bottom right angle-relative to the FlG.,of
  • FIG. 9 there are shown some noteworthy positions of the selection and connection elements, the bars being this time shown as normally constituted.
  • the rest position corresponds to the two points A and A situated at the crossing 'of the selection bars 60 and the connection bars 62; in this position, the
  • connection bars 62 is at rest whilst the bar 64 holds the crosspoints C and C but the mobile springs 73, 74, 75 and 76 have found a clearance by the side of the inclined part of the tooth of the connection bar when the selection bar 61 has been operated to allow the establishment of crosspoints B and B.
  • FIG. l2 which is a cross section view of the lid 39
  • the slots 43, 45, 46 and 47 are designed for housing the ribs 44 (FIGS. 1 and 12) of the lid, this arrangement determining the holding in position of the fixed springs 40 at the bottom of the slots 41, the face of the ribs 44 coming into contact with the upper part of the springs 40.
  • the lid 39 also includes recesses 80 in which can move the free ends of the mobile springs 5 FIGJ); indeed, as it can be seen in FIG. 11 with the mobile springs 79, a certain part of the length of these springs extends from the upper face 81 of the support 38 and may freely move in the lid 39.
  • FIG. 10 By examining again FIG. 10, there can be seen a slot 99, almost central, wider than the others. It is arranged above the internal wall 23 of the frame 6 (FIG. 1) and ensures the housing of a rib 100 of appropriate dimensions of the lid 39 (FIG. 12).
  • the fixed springs 40 are or are not cut in order to realize multiswitches capable of switching two'or four wires. Indeed, in two-wire switching,the selection bars driving pairs of mobile springs (see FIG. 9, for example), one of this pair is placed under the dependence of the connection bar chosen, the two moving springs being thus brought respectively into contact with two fixed springs. In this case-it is the case of FIGS. 1, l0 and l1-an extremity of the fixed springs 40 must be sufficiently long in order to be connected with an appropriate circuit of the printed wiring of the plate 1. The fixed springs 40 are then cut only at'the level of the other edge of the support 38 since they must be accessible to the mobile springs operated by any connection bar.
  • connection bar can only operate two mobile springs and realize only two contacts at the same time, it becomes necessary to control in parallel two connection coils the two bars of which will each drive a pair of mobile contacts thus allowing the establishment of four simultaneous contacts.
  • these two pairs of mobile contacts have initially been operated by the same selection bar, they are situated on the same level and come into contact with the same two fixed contacts. It is therefore necessary to divide the multiplying formed by each of the fixed springs into two distinct parts each connected to a respective printed circuit on the plate 1.
  • FIGS. 13 to 16 represent, on a very large scale, simplified views explaining the role of the L-shaped openings 76 of the fixed spring support of the FIG. 10.
  • the fixed spring support 38 only included openings 90 of the same shape as those of the selections bars and, to simplify the graphic representation, that these openings exactly superimposed in rest or operating position (connection electromagnet deenergized).
  • the mobile spring 82 comes in the bottom right angle of the FIG. from the fact of the inclination given by its mounting on the printed circuit plate.
  • the mobile spring 82 is in operating position, that is in contact with the fixed spring 83.
  • the connection bar is operated so that the tooth 85 moves in the direction of the arrow 86.
  • the mobile spring 82 is thus no longer held against the turns of the spring 83 and goes back to its rest position of .FIG. 13 according to an approximative trajectory indicated by the arrow 87.
  • the mobile spring 82 comes to rub against the sharp angle 88 of the tooth 85 which effects its motion 86.
  • the spring is metallic and the tooth in insulating material of less mechanical resistance, there results a wear of the angle 88 which may become such that the tooth85 is no longer capable of holding the mobile spring 82 between two consecutive turns of the fixed spring 83.
  • the L-shaped of the openings of the fixed spring support 38 makes it possible to avoid these drawbacks and even offers momentous operating facilities.
  • the mobile spring 82 is at rest and it can be seen that its untimely displacement could only be lateral, any possibility of coming into contact with the fixed spring 83 being avoided by means of the edges of the opening 89 and by the connection tooth 85.
  • FIG. 16 corresponds to the release of a connection established between the mobile spring 82 and the fixed spring 83, the tooth 85 of the connection bar being moved in the direction of the arrow 86. It can be seen that due to the vertical" bar of the L opening 89, the mobile spring 82 cannot describe the trajectory indicated by the arrow 87 of FIG. 14 and performs an orthogonal motion. It must follow the tooth 85 in its displacement and escapes from it to come back to the rest condition in a position where there is no danger of wear for the extremity of the tooth.
  • connection and selection electromagnets are controlled by short impulses, it is necessary that there be a certain synchronism between these impulses.
  • the control impulse of the selection bar must be sufficiently long in order that the connection bar has had enough time to drive the mobile spring and hold it against the fixed spring before it ceases (FIGS. 6 and 7). If this impulse is too short or if there is a shift between the control impulses of the selection-and connection bars, in the case of FIG.
  • the tooth 85 has not the time to bring the spring 82 in the V of the fixed spring 83 before the edge 101 of the opening of the selection bar moves off from the spring 82 to return to the, position shown in the FIG.
  • the mobile spring hence returns to the rest position and the connection cannot be established.
  • FIG. 17 is a transverse cross section view of the frame 6 along the axis of a row of these openings, there can be seen the elements of F IG. 1 such as the printed circuit plate 1 with only two mobile springs 5 represented, the frame 6 with the wing 26, the external wall 10 against which come to lean the armatures 97 of the connection coils, the internal wall 22 in cross section, the housings 19 provided in the wall 8 to receive the restoring and mechanical-holding devices of the connection bar, the external wall 11 and its guiding studs 14.
  • the elements of F IG. 1 such as the printed circuit plate 1 with only two mobile springs 5 represented, the frame 6 with the wing 26, the external wall 10 against which come to lean the armatures 97 of the connection coils, the internal wall 22 in cross section, the housings 19 provided in the wall 8 to receive the restoring and mechanical-holding devices of the connection bar, the external wall 11 and its guiding studs 14.
  • the invention concerns a miniature Crossbar multiswitch made up of a basic support constituted by a printed circuit plate also used as support for a set of mobile contact elements, a frame' housing this set, two planes of selection and connection bars and their control coils as well as the restoring devices of the bars, a fixed contact elements support and a lid.
  • each said fixed contact is a stretched spring
  • said grooves include teeth for stabilizing and supporting the position of said stretched springs in said grooves.
  • the multiswitch of claim 4 including means for locating all switch parts in parallel planes which are positioned at different distances away from and parallel to said printed circuit card, the members in one coordinate direction of said orthogonal array being in one of said planes and the members in the other coordinate direction of said array being in another of said planes, and a plurality of fixed contact springs in yet another of said planes, and a plurality of said movable contacts are elongated, mobile flngerspring contacts in said frame and extending freely from said printed circuit card approximately perpendicular to said planes and through the crosspoints formed by the array of contact coordinate members.
  • said orthogonal array comprises flexible ribbons stretched across the top of said frame and held between two upstanding armatures, said armatures being mounted on said frame and spring biased to assume a normal position.

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  • Push-Button Switches (AREA)
  • Contacts (AREA)
  • Switches With Compound Operations (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Structure Of Telephone Exchanges (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
US720248A 1967-04-21 1968-04-10 Miniature crossbar multiswitch Expired - Lifetime US3551631A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR103657A FR1527209A (fr) 1967-04-21 1967-04-21 Multisélecteur à barres croisées miniature

Publications (1)

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US3551631A true US3551631A (en) 1970-12-29

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ID=8629369

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Application Number Title Priority Date Filing Date
US720248A Expired - Lifetime US3551631A (en) 1967-04-21 1968-04-10 Miniature crossbar multiswitch

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US (1) US3551631A (ro)
AT (1) AT291352B (ro)
BE (1) BE713996A (ro)
CH (1) CH496316A (ro)
DK (1) DK123198B (ro)
ES (1) ES352977A1 (ro)
FI (1) FI49889C (ro)
FR (1) FR1527209A (ro)
GB (1) GB1157768A (ro)
IE (1) IE32692B1 (ro)
NL (1) NL6805619A (ro)
NO (1) NO121551B (ro)
RO (1) RO58440A (ro)
SE (1) SE349185B (ro)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3678422A (en) * 1971-07-29 1972-07-18 Gte Automatic Electric Lab Inc Miniature crossbar switch
US3838239A (en) * 1973-07-18 1974-09-24 Gte Automatic Electric Lab Inc Matrix switch with improved actuator translating arrangement
US3863044A (en) * 1973-07-18 1975-01-28 Gte Automatic Electric Lab Inc Open contact matrix switch

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3643053A (en) * 1970-04-29 1972-02-15 Int Standard Electric Corp Crossbar switch with prestressed mobile contact spring and perpendicular first and second shifting means
CH595040A5 (ro) * 1976-04-15 1978-01-31 Standard Telephon & Radio Ag

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3678422A (en) * 1971-07-29 1972-07-18 Gte Automatic Electric Lab Inc Miniature crossbar switch
US3838239A (en) * 1973-07-18 1974-09-24 Gte Automatic Electric Lab Inc Matrix switch with improved actuator translating arrangement
US3863044A (en) * 1973-07-18 1975-01-28 Gte Automatic Electric Lab Inc Open contact matrix switch

Also Published As

Publication number Publication date
CH496316A (fr) 1970-09-15
DK123198B (da) 1972-05-23
NO121551B (ro) 1971-03-15
IE32692L (en) 1968-10-21
ES352977A1 (es) 1969-08-01
AT291352B (de) 1971-07-12
NL6805619A (ro) 1968-10-22
GB1157768A (en) 1969-07-09
FI49889C (fi) 1975-10-10
BE713996A (ro) 1968-10-22
DE1762151B2 (de) 1976-04-29
SE349185B (ro) 1972-09-18
RO58440A (ro) 1975-09-15
DE1762151A1 (de) 1970-04-16
IE32692B1 (en) 1973-10-31
FR1527209A (fr) 1968-05-31
FI49889B (ro) 1975-06-30

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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