US1789489A - Selector for automatic telephone exchanges - Google Patents

Description

Jan. 20, 1931. F. MERK 1,789,489

SELECTOR FOR AUTOMATIC TELEPHONE EXCHANGES Filed March 4, 1929 I5 Sheets-Sheet 1 Jan. 20, 1931. F..MERK 89 SELECTOR FOR AUTOMATIC TELEPHONE EXCHANGES Filed March 4, 1929 3 Shasta-Shoot 2 Patented Jan. 20, 1931 UNITED STATES;

PATENT orrlcr.

FRIEDRICH MERK OF rwxronr-omrnnmam, GERMANY SELECTOR FOB AUTOMKTIC TELERHONE EXCHANGES.

Application flled l iarch 4, lm-flerial No. 344,106, and in Germany-March 5, 1928:

This invention relates to selectors forautomatic telephone exchanges and relatessmore particularly tothe socalled panelaselectorsofthe frame on enlarged scale.

or selectors with a flat: bank multiple field.

ple of such selectors fromseparate bankst-rips and to secure it to frameworks composed of sectional iron which reston the floor of the telephone exchange and are secured thereto.

This known arrangement hascaused many defects and it is the purpose'of the invention to provide an improvement inthis known arrangement.

According to the presentinvention, theflatbank multiple, composed of separate bank strips, is not appliedrdirectl totheframework-which in addition to t e selectorsalso;

supports other apparatus, particularly relay sets and the like.butto a separateindepend ent frame on which are mountedonly the fiatbank multiple and the movable parts'of the actual selector, which frameisprovidedwith securing means for its attachment. to the framework. This separate: frame thereforev 2 carries the bank strips forming the flatbank multiple and the setting members orzslide's of the selectors which are'mo'vable over'the flatban k multiple.

The invention makes it possible, in selectors of this type (bar selectors or panel selectors) to conveniently obtain in an efficient manner the accurate mounting of the parts relatively to one another, which is usually only obtained with difliculty, and to prevent any inaccuracies and variations in the supporting points,

from having a deleterious action on the-.selectors.

A further object of the invention is to provide against any possible'bending of-the bank 40 strips by employing supporting members.

which support and securethe separate bank strips not only at their ends, but also attanumortin frame arran ed accordin to the ill- P e vention with five bank strips, on the front of which are formed six contact fields; attentionbeing drawn to the factthat the rear side-has It is usual to compose the flat bank multia substantially similar appearance and .isgprovided 1n a similar man nerwith contact fields.

Figure 2 1s a partial elevation; of a corner a somewhat modified constructioniof frame,

byway of example as beingefiected by means of screw bolts, andgussetplates 6, 7 are provided for the purposeof stiffening the frame. Beyond the side portions 4, 5 project theends of the strip l and'theusset plates 6, 7 and these parts are provide with holes 30 and 31 i in order to secure the frame as a whole in the manner shown in Figure 6 to a supporting structure 19 formed in the usual manner of two ironbars, the securing beingefiected by means ofscrew bolts 32- whichare fitted through the holes'30, 31 and holes provided adjacent thereto in the supporting structure 19. The securingand arrangement is such, thaththe parts 1, 2 and 3 when mounting the frame on the structure are horizontal.-

The. space between the two horizontalbars 1, 2 is filled with a plurality of superposed bank strips 8, there beingfive of the same shown in this instance. These five bank strips form the bank multipleandeach separate strip is made in a manner well-known to every expert in this art, by layersof-hsheetvmetal stripshaving projections and insulating strips, thisarrangement not requiring .further description. The projecting ends of the sheet metal strips form contact blades 33 at the front and rear of the framework as is indicated diagrammatically in Figure 2. In each selector contact field, these blades form three vertical rows (see Figure 2) and in each bank strip 8 there are located at each contact field, as can also be seen from Figure 2, ten superposed separate contacts in each row.

It is assumed that the width of the bank contact strips 8 is selected of such a size that there are formed horizontally side by side in each bank strip 8, six fields each of three X ten contacts 33, and it is further assumed that between the bars 1 and 2 five such bank strips 8 are arranged one above the other.

The outer ends 9 of the strips 8 are provided on both sides in the manner indicated more clearly at the left of Figure 2, with soldering eyes 34. Figure 2 shows that the number of soldering eyes 34 in each end piece 9 is only half the number of contacts 33 in one partial. field in order to permit a more con venient connection of the conductor wires (not shown), while it will be clear to an expert in the art that on each side of the field 9, one-half of the connecting conductors is soldered on. 1

r The bank strips 8 are securec by means of transverse bars 10 fastened at the front and rear of the multiple to the frame parts 1 and 2. Between the transver e bars 10 on the front and rear of the multiple, U-shaped cover bars 12 (Figure 3) are secured by headed screws 11, these barsforming cover bars for the bank strips 8.- The vertical spacement between the separate bank strips is regulated by the spacement between the holes in the bars 10 through which the screws 11 are drawn into the cover bars 12. It will be understcod that the holes ma be orovided yer easily in accurately determined invariable intervals to obtain an invariable spacing of the bank strips 8 over the entire multiple field.

12 by any suitable known means, for example by lower bars 35 and by screws 36 which ure 1 exposed to View, and release of the screws 11, each separate strip 8- can be re- ;noved and replaced.

In the form of construction according to Figures 1 and 3, a guide bar 13 is secured over each strip 10 at a predetermined.

distance therefrom, the securing being effected by means of terminal bolts 40 and spacers The strips 8 are secured to the cover bars 39. To the lower horizontal member of the frame are secured the driving mechanisms 15 for the bar insulators co-operating with the flat bank. These may be constructed in any usual manner and require no further description. They are adapted to move a selector slide 14 of the bar selector, which is movable and co-operates with the contacts 33, up and down.

These bars 13serve to guide projecting parts 37 of the selector slides 14 and to support at their lower end 38, the upper end of the driving work part 15, as shown in Figure 1, while between these parts any suitable connecting means such as screws, rivets or the like, may be provided. The ends 38 may also engage with pockets of the driving mechanisms 15 or vice versa the driving mechanism may engage with pockets at the ends 38.

Figures st and 5 show a construction of a flat bank multiple according-to the invention in which the number of connecting bars 10 may be reduced. While in the construction according to Figures 1 to 3 the selector slides 1e surround the edges of the bars 13 b projections 37, lateral .bars 13 are provi ed on the selector slides in this modified form of construction which engage with corresponding slots 37 of trans-verse members 16, (see Figure 5) which for example are secured on the cover bars 12 of the bank strip.

In the manner shown in Figure 6, relay sets 20 and 21 can be provided above and below the frames 1 to 3 for the bar selectors on the structure 19, as indicated diagrammatically in the drawings, the relay sets 20 representing for example subscribers relays which are secured in a readily detachable manner in vertical rows, and the relay sets 21 illustrating therelays necessary for the operation of the selectors.

Instead of securing the frame bars 1 to 5 as above described by means of four screw bolts 32, the securing thereof may be effected in other ways, as forv example by passing only thetwo screw bolts 32 through the holes 30 and corresponding holes in the structure 19'so that the entire selector arrangement will be suspended in the structure only at two points.

I claim 1. In an automatic telephone exchange havingbar selectors including movable setting slides and flat bank multiple fields, a rectangular frame comprising a plurality of iorizontal and vertical frame members, bank strips forming the flatbank multiple, means for securing the bank strips in parallel arrangement between two of the said horizon- .tal members "of the frame, means on the said rectangular frame for holding the horizontal and vertical members rigid in relation to oneanother, and means for securing the said frame to a selector structure.

pages 2. In an automatic telephone exchange having bar selectors including movable setting slides and flat bank multiple fields, a rectangular frame comprising a plurality of l'iorizontal and vertical frame members, bank strips forming the flat bank multiple, means for securing the bank strips inparallel arrangement between two of the said horizontal members of the frame, means on the said rectangular frame stiffening the horizontal and vertical members relatively to one another, guide-members supported by said stiffening means, and means at the upper end of the said frame for connecting it to a selector structure.

3.'In an automatic telephone exchange having bar selectors including movable setting slides and flat bank multiple fields, a rectangular frame comprising a plurality of horizontal and vertical frame members secured together, a plurality of bank strips forming the flat bank multiple, a plurality of vertical transverse members connecting two of the said horizontal members of the frame and arranged at regular intervals apart, means securing horizontal bars to said transverse members, means securing each of the bank strips to one of the said horizontal bars, guide members in combination with said bank strips for guiding a setting slide in a vertical direction, means on said frame for stiffening the horizontal and vertical members relatively to one another, and means for securing the said frame to a selecfor structure.

4. In an automatic telephone exchange, flat bank multiple fields comprising a plurality of parallel horizontal rectangular bank strips with projecting insulating contacts, parallel bars, ap lied at the upper side and at the underside 0 each of the said bank strips, means for drawing together and clamping said bank strips between each two of the said bars, a plurality of vertical bars arranged at uniform intervals on op osi'te sides of the flat bank multiple, means fbr securing the upper of said horizontal bars to said vertical bars, two horizontal supporting members, means for connecting said vertical bars to said horizontal supporting members to form a rigid structure, and means for connecting the whole rigid structure to a selector structure. 7

5. In an automatic telephone exchange aving bar selectors, including movable setting slides, driving means for said slides, a base plate for the driving means, and flat bank multiple fields; a rectangular frame comprising a plurality of horizontal and ver- 5 ical frame members, bank strips forming the flat bank multiple, means for securing the bank strips in parallel arrangement between two of said horizontal frame members, means for securing said base plate for the driving means to a third horizontal frame member,

means on ,saidrectangular frame for stifien- --ing its, horizontal and vertical members relatively'to one another, and means for securing the frame to a selector structure.

6. In an automatic telephone exchange having'bar selectors, including movable setting slides, flatbank multiple fields and driving members for moving the setting slides over the flat bank fields; a rectangular frame comprising a pluralityof horizontal and vertical frame members, a plurality of separate bank strips forming said flat bank multiple, a plurality of multiple transverse members connecting two of said horizontal frame members together and arranged at uniform intervals apart, means securing horizontal parallel bars to these transverse members, means securing one of said bank strips to each of said horizontal bars, a third horizontal member on said frame, means securing the driving members of the selectors to said third horizontal member, members on the second horizontal frame member for 'su porting the other end of said driving mem ers, ulde members in combination with the ban strips for guiding the selector slide in a vertical direction, and means for securing said frame to a selector structure.

7 In an automatic telephone exchange, fiat bank multiple fields comprising-a plurality of horizontal rectangular bank strips with projecting insulated contacts, parallel horizontal bars, arranged at the upper and lower sides of each of the bank strips, means for drawing together and clamping said bank strips between each two of said bars, a plurality of vertical bars arranged at uniform intervals on both sides of the fiat bank multiple, means for securing the upper of the horizontal bars to said vertical bars, two horizontal supporting members, means for connecting the vertical bars to said supporting members so as to form a rigid structure, a third horizontal supporting member, means for connecting said rigid structure to said third supporting member, and means for connecting the rigid structure to a selector structure.

8. In an automatic telephonev exchange with bar selectors, including movable setting slides, fiat bank multiple fields and driving members for moving the setting slides over the fiat bank fields; a plurality of horizontal rectangular bank strips with projecting insulated contacts, parallel bars, at the upper and lower sides of each of the said bank strips, means for drawing together and porting member, means for connecting said rigid structure to said thlrd supporting memberymeans for securing the driving members

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