US2816173A - Device of open-wire multiple conductors - Google Patents

Description

Dec. 10, 1957 A. K. DIETSCH DEVICE OF OPEN-WIRE MULTIPLE CONDUCTORS Filed Jan. 19', 1954 3 Sheets-Sheet 1 mmmw w v 02L? D lllllllll".

llti KI Dec. 10, 1957 A. K. DIETSCH 2,816,173

DEVICE OF OPEN-WIRE MULTIPLE CONDUCTORS Filed Jan. 19, 1954 5 Sheets-Sheet 2 Fig. 4

DEVICE on ornN-wmn MULTIPLE CONDUCTORS Arne Kurt Dietsch, Enskede, Sweden, assignor to Telefonairtiebolaget L M Ericsson, Stockholm, Sweden, a corporation of Sweden Application January 19, 1954, Serial No. 404,389

Claims priority, application Sweden March 4, 1953 2; Claims. (Cl. 179-4754) The present invention refers to relay selectors for automatic telephone systems, for example multiple relays or cross-bar switches, and relates to a device for controlling the contact springs and fastening open-wire multiple conductors.

The object of the invention is to support the contact springs in determined rest positions so, that deterrrnned contact intervals are obtained in relation to one or several open wire conductors and that an individual adjustment of the contact springs is avoided, and cons sts in an oblong cast block of electrically non-conducting material with a first lateral side facing the contact springs and a second lateral side facing the multiple conductors being provided with at least one longitudinal row of funnel-shaped holes between said two lateral sides, the contact springs being introduced into said holes, and with longitudinal furrows in said second lateral side, the multiple conductors being located in said furrows, which cut said holes.

The invention and the application thereof to cross-bar switches is shown in the accompanying drawings, Figs. l-S, and the application thereof to a multiple relay is shown in the accompanying drawings, Figs. 6-7.

Fig. 1 shows the upper portion of a cross-bar switch with an operating bar unit P and five selecting bar units S mounted in a frame 1.

Figs. 2-3 show an embodiment of the selecting bar units.

Fig. 4 shows another embodiment of the selecting bar units.

Fig. 5 shows the bar support 2 for the operating bar unit.

As appears from Fig. 1, the cross-bar switch consists of a frame 1, which supports a number of vertical units S, here called selecting bar units, and a number of horizontal units P, here called operating bar units. A selecting bar unit is shown in Figs. 23. Only one operating bar unit P is drawn in Fig. 1. Each operating bar unit consists of a bar support 2;, which is more accurately shown in Fig. 5, two flanges 3 and 4, an operating bar 6 with pertaining electromagnet 5. The electromagnet 5 is mounted on the flange 3, which latter also supports a contact spring group 7. The operating bar 6 is turnably mounted in the flanges 3 and 4, which are screwed within and kept together by the bar support 2. The operating bar is built in one piece with the armature of the operating magnet 5 and actuates on one hand the contact spring 13 of the multiple in Fig. 2, and on the other hand the contact spring group 7.

The selecting bar unit according to Figs 23 is double, i. e. comprises two groups of vertical conductors 19 with pertaining contact springs 18, a selecting bar 14, and an electromagnet 17', and consists of an oblong metal sheet 11 mounted on both sides and supporting on each side a longitudinal bar 12 of insulating material, on which a group of conductors 19 are fastened, together with the contact springs for the crossing points pertaining to the United States Patent 0 2,816,173 Patented Dec. 10, 1957 group, between the conductors 19 and the operating bar units of the cross-bar switch. A saving as well in costs as in space is evidently obtained by means of double mounting.

Fig. 3 shows the selecting bar unit seen from the left, whereby a portion is supposed to be cut off along the lines A-B--, B-C, and 0-D in Fig. 2.

The bar 12 has a U-shaped cross section with two sidepieces and one central piece. The conductors 19 rest against and are fastened to the central piece. The contact springs 18 consist of wires with cylindrical silver contacts 18a and are fastened on the side pieces at some distance from the conductors 19. Each contact spring 18 is soldered to one of the conductors 19 at the crossing point.

The contact springs at each crossing point are kept together by a lifting bar 16 of insulating material, the aspect of which appears from Fig. 3. The lifting bar is provided with an extension 16a, on which an indicating means 15 of metal sheet or any other suitable material is turnably mounted. The indicating means 15 is provided with flaps, 15a, 15b and 150. A spring 21 rests against the flap 15b and presses the flap 15c against a jack in the selecting bar 14. The flap can be bent either upwards or downwards by means of a bending tool, and the flap 15a serves as contact against the operating bar 6, when the springs 18 are to be lifted.

The selecting bar 14 is stretched between a spring 20 and a clasp 17 which is fastened to the armature 17a of one of the selecting magnets 17, for example 17b. The spring 20 furthermore actuates a contact spring group The metal sheet 11 is provided with a support lla for determining the position of the contact springs in relation to the conductors in the operating bar units P. The operating bar units can be moved vertically and the supports 11a can be bent sideways. When the selecting bar unit is removed from the frame 11, the lifting bar 16 rests with its extension 16a on the support 1111. The lower part of the metal sheet 11 is bent on one side and supports a magnet system 17 consisting of a flat yoke with four legs, the middle ones being provided each with a coil 17a and 17b and constituting the cores of the two selecting magnets. The armatures of the selecting magnets rest against the outer legs of the yoke 17c and are kept in a position by means of a supporting sheet 17d of brass, which is screwed to the yoke 17c and constitutes on one hand a support for the armatures 17s in unoperated position and on the other hand a guiding bearing for the selecting bars 14.

The contacts 18:: of the contact springs 18 are introduced into holes in the bar support 2. The contact springs are stretching on one hand downwards and on the other hand towards the metal sheet 11, so that the lifting bar rests against the support 11a, when the selecting bar unit is removed from the frame 1. When the selecting bar unit is introduced into the frame, the contact springs rest in the hole 212 of the bar support 2 in Fig. 5.

The bar support 2. consists of a strip of insulating material with longitudinal furrows and transversal rows of holes 2b. The furrows cut the holes 2%. Conductors 2a are located in the furrows. The conductors are provided at each hole with an angular bending and are, on the right side of the strip, bent perpendicularly and passed through holes 201 in the strip. The protruding part 2e serves as soldering point for soldering a conductor wire. There are grooves 2c on the edges of the strip for determining the mutual position of the operating bar units and the selecting bar units.

The angular bending of the conductors at each hole 2b is suitably elfected after the conductors 2a have been laid in the furrows of the strip. The purpose of the headings is to provide two contact points when the cylindrical contact 18a of a contact spring 18 is lifted against the tip of the angle.

The cross-bar switch functions in the following manner. The selecting magnet 17b attracts its armature 17a, moving the selecting bar 14 downwards. The indicating means 15 swings so that the flap 15a hits against the operating bar 6 and is kept pressed against said operating bar by means of the spring 21. The operating magnet 5 attracts its armature, thus causing the operating bar 6 to lift the indicating means 15, which in its turn actuates the lifting bar 16 and the contact springs 18. The contacts 18a are lifted towards the angular bendings at the holes 2b and come into contact with the conductors 2a. When the selecting magnet releases its armature the selecting bar is restored to the position shown in Fig. 2, but does not come into touch with the flap c of the indicating means 15, since said means is lifted by the bridge 6. The selecting bar can thereafter be raised and lowered without affecting the indicating device 15. When the operating bar 6 is released the contact springs 18 are restored to the position shown in Fig. 2. The flap 150 hits against the selecting bar 14 and the indicating means 15 swings back to initial position.

The hole in the metal sheet 15 for the lifting bar 16 shown in Fig. 2 is shaped as a sector and leaves only a small play between the curve of the sector and the lower part of the lifting bar. Since the flap 15a hits against the operating bar 6, there is no play between the operating bar and the indicating means. The lifting bar 16 is furthermore cast round the contact springs 18, or else the contact springs 18 are inserted into tightly fitting holes in the lifting bar so that there can be no play there either. The rest position of the selecting bar 14 is adjusted by means of a screw 23 fastened into the sheet 17d. The position of the sheet 15 is further adjusted by bending the flap 15c. By letting the contacts 18a rest in the hole 2b in the bar support 2 and determining the mutual position of the bar support and the metal sheet 11 by means of the support 11a, it becomes possible, on one hand to insert and remove the selecting bar units and the operating bar units easily, and on the other hand to obtain determined contact intervals and contact pressure.

The purpose of Fig. 4 is to prove that the selecting bar 14 can be fastened outside the bar support 2 if it is turned by its electromagnet instead of being raised and lowered. The indicating means then consists of a flexible wire in full accordance with known cross-bar switches. The operating bar units can be inserted from the left according to Fig. 1 and thereafter made to mesh with the selecting bar units S. The selecting bar units S may in this case however not be removed until the operating bar units P have been removed.

Figs. 6-7 show a multiple relay consisting of a frame 1, a bar support 2, a number of contact spring groups 3 and an electromagnet 6 for each contact spring group. Fig. 6 shows the relay seen obliquely from behind, and Fig. 7 shows the relay seen straight from the front.

The bar support 2 consists of a cast strip of insulating material provided on the front with longitudinal furrows, in which open-wire conductors 9 are located. The strip is provided with a longitudinal row of oblong holes 8, into which the contact springs 4 in the contact spring group 3 are inserted. The furrows cut all the holes 8. The conductors 9 are bent 90 and introduced into holes 10 on one side of the strip. The portions 11 of the conductors 9 which stuck out on the back of the strip serve for soldering the conductor wires.

Each of the contact spring groups 3 consists of a strip of insulating material in which contact springs 4 are cast.

The contact springs 4 are further kept together by a lifting bar 5 and provided with cylindrical silver contacts, which are not drawn in the figure. The lifting bar 5 rests against the armature 7 of the magnet 6. The magnets 6 are screwed to a frame mounting strip 12 along the un der-side of the bar support 2. The contact spring groups are directly actuated by the armature 7 of the magnets 6 and thereby brought into contact with the conductors 9.

1 claim:

1. A contact arrangement for switches for automatic telephone systems composing a generally rectangular block of dielectric material having longitudinal grooves in one of its faces and a number of holes extending perpendicular to said face and intersecting said grooves, said holes being arranged in rows perpendicular to said grooves, wire conductors fitted within said grooves each having an angularly bent portion at each point where a wire conductor intersects one of said holes, contact springs resting in said holes normally spaced from said respective bent portion and lifting means selectively coacting to lift the contact springs in one of said rows, each lifted contact spring making contact with the corresponding wire conductor at two points within said angularly bent portion.

2. A cross-bar switch for automatic telephone systems comprising a main frame, a number of detachable multiple frames arranged on one side of said main frame, a number of selectors arranged on the opposite side of said main frame; each multiple frame comprising at least one set of fixed multiple conductors, a selecting bar and a selecting magnet; each selector comprising a set of fixed wire conductors crossing said multiple conductors and an operating bar with an operating magnet; switch contact springs in said cross-bar protruding from the multiple conductors at each crossing point between a set of said multiple conductors and the wire conductors of a selector; an indicating device and a lifting bar in the multiple frame at each of said crossing points; said indicating device being deflected by said selecting bar when said selecting magnet is energized to engage said operating bar, said operating bar actuating said lifting bar when said operating bar is operated by said operating magnet, actuation of the lifting bar actuating said contact springs and said contact springs bringing each conductor in a set of multiple conductors in contact with a wire conductor in the selector at the crossing point; each selector comprising a generally rectangular block of dielectric material having longitudinal grooves in one of its faces and a number of holes extending perpendicular to said face and intersecting said grooves; said holes being arranged in rows perpendicular to said grooves; said wire conductors fitted within said grooves each having an angularly bent portion at each point where a wire conductor intersects one of said holes; said contact springs resting in said holes normally spaced from said respective bent portion, and each contact spring when lifted by said lifting bar making contact with the corresponding wire conductor at two points within said angularly bent portion.

References Cited in the file of this patent UNITED STATES PATENTS 2,434,373 Svensson et al. Jan. 13, 1948 2,577,067 Arthur Dec. 4, 1951 2,598,085 Vidgren et a1 May 27, 1952 2,680,783 Graybill et al. June 8, 1954 2,718,559 Lunkvist et al. Sept. 20, 1955 2,731,516 Vincent Jan. 17, 1956 2,758,158 Kruithof et al. Aug. 7, 1956

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