US2216850A - Mechanism for limiting the calling possibilities of a telephone apparatus - Google Patents

Mechanism for limiting the calling possibilities of a telephone apparatus Download PDF

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Publication number
US2216850A
US2216850A US159790A US15979037A US2216850A US 2216850 A US2216850 A US 2216850A US 159790 A US159790 A US 159790A US 15979037 A US15979037 A US 15979037A US 2216850 A US2216850 A US 2216850A
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United States
Prior art keywords
disk
lever
dial
roller
spring
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Expired - Lifetime
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US159790A
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English (en)
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Marti Fritz
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Individual
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Individual
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Publication of US2216850A publication Critical patent/US2216850A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M17/00—Prepayment of wireline communication systems, wireless communication systems or telephone systems
    • H04M17/02—Coin-freed or check-freed systems, e.g. mobile- or card-operated phones, public telephones or booths
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/677—Preventing the dialling or sending of predetermined telephone numbers or selected types of telephone numbers, e.g. long distance numbers

Definitions

  • the invention relates to an exchange ⁇ system for a telephone withlimited calling possibilities, in whichiimpulse transmission takes place on the return movement of the impulse-dial.
  • a shaft is coupled, adapted to rotate two control disks on which concentric partition walls :are arranged, whereby the walls of one of said disks have gaps corresponding to theblocked upnuinerals.
  • a spring-controlled l feeler adapted to penetrate intojsaid gaps, is
  • I I I I Fig.' 3 is a partialand schematic representa tion of the second embodiment.
  • T indicates the receiver, IMi the microphone, Tr the transformer, D the impulse dial, C1 the switch controlled by. said dial, F the hook switchwhich closes the circuitwhen the receiveris takenofi.
  • a worm wheel I5 is loosely placed on shaft H, and meshes with worm l6 coupled witha centrifugal gov- 45 ernor H the rotating masses of which are rep- I resented schematically and denoted by 18 pawl "mounted on worm wheel I5, and acted I upon by spring 23, glides over the teeth of the? ratchet wheel, whenrdial ID is turned in'the, di'- 50 rection of arrow 10, but drives worm wheel and, thereby, governor II, when the dial returns in the direction of arrow H under the effect of I spring I3 which is initiallystressed.
  • Worm wheel l5 I carries a cam disk IS with bosses 20 distributed on its circumference in the same, way as it will be understood that switches C2, Cs, C4
  • Fig.1 is a perspective, schematic representa through the alternating current supplied by the the digit holes on the impulse dial.v These bosses act on a contact 2l'of switch Ci opening'the circuit shown in Fig. 1. Referring to this Figure 1 connected in parallel With switch C1 short circuit the latter, if any of these contacts is closed and thus permit the transmission of'predetermined numbers only, it said switches are closed for all other numbers. which-one may attempt to set.
  • a lock Se is illustrated as a means of l I closing one of these switches, viz: C4, if lit is desired to prevent any use at the telephone station.
  • -I r I I I I I There is also a relay B. connected in serieswith SWi'tchesCa tojCi. This relay serves the purpose 15 either to give noticethat the apparatus cannot I be used, or, in case of a prepayment telephone I station, to return the money.
  • I I Awheel l4 isfixed to shaft ll, alternately ro tating either in the direction of arrow 1001" of 20 v arrow.
  • Wheel i4 servesas a connecting means between the impulse dial and the mechar nism according to 'the invention. In theembodi- I merits shown this mechanism is located-at the in the same direction by means of 'pawl' 28.
  • Dial 5 I D isoperated in a well-known manner by intro ducing a finger'into the desired hole and by, rotating it until the finger touchesstop 12. Then the dial is let go whereupon it runs backunder the efiect ofspring l3. These two inverse movements of the dialare transmitted to shaft 25 by meshing with wheel 14.
  • Shaft 33 is under the influence of spiral spring 34 whose tensionincreases at ev ys ep of ratchet Wheel 32. 'This latterj wheel is held up by pawl 38 which,;in its turn, is mounted on shaft 58 and means of gear wheel 24 fixed to saidshaftand acted upon by spring 51; which latter presses pawl 38 againstratchet Wheel 32.
  • Pin 36'',attached to ratchet wheel 1 32 bears against flexible stop 31 when wheel 32 is in its initial position.
  • the mechanism shown comprises only one 1 group of twomembers which serve the purpose of selecting between the permitted and nonpermitted subscriber-numbers, viz: in, cases where 55 I number however, in the embodiment illustrated the use of the station must be limited for any reason, be it that a subscriber wants to prevent third parties from setting up trunk connections, or that the station is a prepayment station for local calls or for special trunk calls. Since trunk connections are set up by using code numbers prefixed to the subscribers individual number and in order to prevent fraudulent use of the station, it will sufiice-to prevent the transmission of a certain digitat a certain place of the subscribers number.
  • the selecting members are formed by disks 35, 21 'fixed to shafts 33 and 25 respectively. Each of them carries, on one of its faces, concentric cylindrical partition walls equidistant from each other by a space which allows a feeler to-passbetween these walls. For disk 35 this feeler' is a roller 52 and for disk 2'? a roller M. The axis of these rollers are parallel to shafts 33 and 25 and parallel to shaft 34) of lever 35 carrying said rollers.,. This lever controlled by a spring 53 fixed to the frame and tendingto apply said rollers othe disks. One'arm of said lever is I ,oftherollers from "one to another of said partition walls. These walls each possess at least one. gap. through which the rollers may pass. In
  • disk 35 the gaps of the partition walls are located in such a way that the gap of the outermost wall, after disk 35 has been rotated one step, lies injuxtapositicn to roller 52; after disk has been moved a further step, the gap of thei second wall liesin juxtaposition to roller 42, etc.
  • the innermost wall is formed as ,a solid cylinder.
  • the ends of the l-otherpartition walls of disk 35 is shown in Fig. 2.
  • the position of the other gaps "dependson the subscriber-numbers to be permitted or nonpermitted- In the example of Fig. 2 the transmission of the numbers 354 to 359 is excluded.
  • the outermost partition wall of disk 21 is provided with a gap on radius 3', which corresponds to the position of digit hole 3' on impulse dial D; the second partition .wallhas'a gap on radius corresponding to digit hole 5 and the third partition wall has a gap extending. over the space from radius 4 to 9. 1
  • Arm Ml has thus approached key 45 by about a third of the amount required for closing the circuit at C3,.
  • Lever s8 is now kept in position with theaid of the second tooth of segment 45 anddisk 2? is again in its initial position with roller ii in line with radius'ilii, but in the first partition of disk 2'3. Then digit 5 is dialled.
  • Workings similar to those previously described now occur but with the difference that roller 52 drops upon the third partition wall and roller M passes through the gap on radius 5..
  • roller 55 is now between the second and the third partitionwall switch C3 does not yet close the circuit and the interruptions caused by'dialling digit 5 are also transmitted.
  • Bosses 25 of disk l9 have, therefore, not yet operated impulse contact C1 by which the subscribers number should be transmitted, so that, since the circuit is. closed at C3, the interruptions at 01 when they finally occur during further return motion of dial D into its initial position, are without any effect. Owing to the fact that one gap of the third par-' tition wall of disk 2i extends over the space of radii 4 to 9, not only the transmission of number. 354,, but: also of numbers 355 to 359 will be excluded in the same way as above described.
  • Lever 39 must now be returned to its initial position shown in Fig. 2.
  • the mechanism comprises a shaft 66 to which are attached: a member 65 for hanging up the receiver, a finger 59 adapted to co-operate with lever 48 and a finger 58 co-operating with pawl 58.
  • Receiver hook 65 can be moved between two stops the upper stop;
  • Switch C2 serves to prevent such a fraud.
  • This switch is closed when the Whole mechanismis in the initial position shown in Fig.2.
  • This contact spring is formed so as tobe kept in this raised position by means of tooth B0 of lever 62 which is pivoted at 63 and pressed against the free: end of the shaft of worm l5 by means of spring 54;
  • Contact spring 59 is provided with a lateral notch the width of which is equal to the totalof the width of lever 62 entering the notch and the height of tooth 60.
  • lever 62 On the opposite side of tooth 50 lever 62 carries a second tooth 5
  • Tooth 60 then disengages contact spring 59 which the dial is stopped during its return motion the axial thrust on the worm ceases, since ratchet wheel l2 no longer drives wheel l5 by means of pawl 22.
  • the inertness of the rotating masses l8 of the governor cause an ulterior rotation of worm I6, whereby the stopped wheel l5 acts asa stationarynut, so that the worm is displaced to the left.
  • Spring 64 then movesllever 62 in an anticlockwise direction whereby tooth 6
  • r l l dis- Lever 39a differs from lever 39 by thefact that it only carries roller 4
  • the position of lever 39a does, as in Fig. 2, not depend on the position of disk 35 until its toothed segment has been released.
  • Number 354 will be transmitted in the following manner; After the first rotation of dial D roller 42 is in line with radius of disk 35 and by the effect of spring 19 applied to the second partition wall. Lever 18 closes switch C3. This latter remains closed as long as roller 4
  • first of said control disks is arranged to be rotated by the impulse-dial during the complete return movement of the latter and the second disk is arranged to be rotated one step at each series of impulses, a toothed 'segluent integral with said feeler and a springcontrolled arm carrying a stop adapted to cooperateternporarily with said segment to permit the feeler to come into contact with the second control disk and a notched disk provided with a gap and integrally connected to the first controldisk and a spring controlled pivoted tongue mounted on the axis of said stop-carrying arm and arranged to cooperate with said notched disk to render said stop-arrangement temporarily in effective.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Transmission Devices (AREA)
  • Telephone Set Structure (AREA)
  • Mobile Radio Communication Systems (AREA)
US159790A 1936-08-19 1937-08-18 Mechanism for limiting the calling possibilities of a telephone apparatus Expired - Lifetime US2216850A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH500971X 1936-08-19

Publications (1)

Publication Number Publication Date
US2216850A true US2216850A (en) 1940-10-08

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ID=4516927

Family Applications (1)

Application Number Title Priority Date Filing Date
US159790A Expired - Lifetime US2216850A (en) 1936-08-19 1937-08-18 Mechanism for limiting the calling possibilities of a telephone apparatus

Country Status (7)

Country Link
US (1) US2216850A (de)
BE (1) BE423200A (de)
CH (1) CH195491A (de)
DE (1) DE690679C (de)
FR (1) FR825777A (de)
GB (1) GB500971A (de)
NL (1) NL48597C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3284578A (en) * 1963-02-11 1966-11-08 Earl R Evans Direct-dialing long-distance telephone systems
US3358087A (en) * 1964-05-21 1967-12-12 Western Electric Co Telephone instrument dialing control device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3284578A (en) * 1963-02-11 1966-11-08 Earl R Evans Direct-dialing long-distance telephone systems
US3358087A (en) * 1964-05-21 1967-12-12 Western Electric Co Telephone instrument dialing control device

Also Published As

Publication number Publication date
CH195491A (fr) 1938-01-31
BE423200A (de)
NL48597C (de)
DE690679C (de) 1940-05-04
FR825777A (fr) 1938-03-14
GB500971A (en) 1939-02-20

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