Telephone with long distance dialing lock out

Details Telephone with long distance dialing lock out Telephone with long distance dialing lock out

1979-11-19

1982-09-07

Rubinson, G. Z.

179189D, 179 18DA, H04M 166, H04M 136

Patent

active

043485553

DESCRIPTION:

BRIEF SUMMARY
In a number of countries it is necessary to dial zero first when it is desired to make a direct-dialed long distance call. Then the number being called is dialed. If the telephone is located in an area where people may have access to it who are not authorized to use it for making long distance calls for which they may not pay, there is the danger that such calls may be made. In other situations a person may wish that at times his telephone be used for incoming calls only.
It is among the objects of this invention to provide a telephone with means for selectively preventing dialing of long distance calls or preventing all outgoing calls while allowing incoming calls, and to do these things by adding only a few special elements to a dial telephone.
The preferred embodiment of the invention is illustrated in the accompanying drawings, in which
FIG. 1 is a plan view of a dial telephone with the case broken away;
FIG. 2 is a side view with the dialing mechanism raised for the sake of clearness;
FIG. 3 is an enlarged view looking upwardly under the dialing mechanism;
FIG. 4 is a cross section, again upside down, taken on the line IV--IV of FIG. 3;
FIGS. 5 to 11 are upside down views illustrating the operation of the invention after the receiver has been lifted from its cradle, FIG. 5 showing the position of certain parts during dialing while the telephone is set for normal operation;
FIG. 6 is an enlarged view taken on the line VI--VI of FIG. 5;
FIG. 7 is a view similar to FIG. 5, but with the telephone set for no long distance dialing;
FIG. 8 shows zero dialed but the dial not yet released for its return movement;
FIG. 9 shows the position of the parts permitting only a local call to be made;
FIG. 10 shows a position of the parts while the local number is being dialed; and
FIG. 11 shows the telephone set for incoming calls only.
The arrows on gear 20 in FIGS. 5 and 7 to 11 indicate the next direction of rotation of the gear from the position shown.
Referring to FIGS. 1 and 2 of the drawings, a conventional dial telephone has a case 1, in one end of which the usual bells 2 are mounted. In the opposite end of the case there is a stand 3 that supports the dialing mechanism 4, by which the number being called is signalled to a central office in the usual way. Between the dialing mechanism and the bells the top of the case is provided with a cradle 6 for supporting the usual receiver-transmitter unit or hand set (not shown). When in place on the cradle, this unit depresses a pair of plugs 7 that rest on the rear ends of a generally U-shape bracket 8 that is pivotally mounted on a stationary bracket 9. The rear ends of the pivoted bracket are urged upwardly by a tension spring 10 connecting the two brackets. When the hand set is in the cradle, the pivoted bracket operates electric switches in a box 11 to disconnect the hand set and to connect the bells in the circuit for incoming calls.
The dialing mechanism 4 includes a circular stationary dial base 13 rigidly mounted on a metal plate 14 (FIGS. 3 and 4) that is provided with three screws 15 for securing the plate to the supporting stand 3. A shaft 16 is journaled in the center of the dial base and extends down through the metal plate. Rigidly mounted on the upper end of this shaft is a circular dial 17 provided with the usual finger holes 18 opposite numbers or digits 1 to 0 (representing 10) on the dial base. The dial can be turned clockwise by a person's finger inserted in any of the holes and, when released, will be returned by a spring (not shown) to its original or normal position.
Referring now to FIGS. 2, 3, and 4, and especially FIGS. 3 and 4 that are upside down, mounted on the lower end of the dial shaft is a large gear 20 which, through other gears turned by it, drives a governor 21 that controls the speed of the counter-clockwise or return movement of the dial. Extending across the center of the large gear from an insulating block 22 supported by metal plate 14 is a pair of spring contacts 23 that are urged toward each other. However, when the dial is in

REFERENCES:
patent: 3284578 (1966-11-01), Evans
patent: 3513271 (1970-05-01), Stathacopoulos
patent: 3761639 (1973-09-01), Uno
patent: 3832497 (1974-08-01), Vogt
patent: 3937900 (1976-02-01), Nogakura
patent: 4022992 (1977-05-01), Kennedy
patent: 4139741 (1979-02-01), Kennedy

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