DE548345C - Hook switch for intercoms connected to self-connecting exchanges with restricted traffic authorization - Google Patents

Description

They are already available for self-connecting exchanges connected subscriber microphone units with restricted traffic possibilities, delay devices for Hook switch ο. Like. Known which in the production of prohibited connections a bypassing of the blocking devices attached to the impulse transmitter by inadmissible Measures on the hook switch

ίο Prevent and cause immediate triggering. However, these facilities have the disadvantage that when you pick up the microtelephones from the hook switch the subscriber is not immediately connected to the exchange is, but has to wait some time before he can dial the desired subscriber number may begin. Failure to observe this period will result in a faulty connection, d. H. if the subscriber dials a call number immediately after picking up the microphone from the hook switch executes without waiting for the official signal, a number of power surges are suppressed.

According to the invention, the hook switch is provided with a delay device, which does not come into action when the microphone is removed from the hook switch, so that the connection is immediately established is established via the hook switch with the office, but when the Hook switch temporarily comes into effect and interrupts the line loop for a certain time, so that the Triggering is brought about immediately. For this purpose, the hook switch receives an articulated trap, which one in a known manner by air pump and tension spring loaded lever moves when the hook switch is depressed. in the The course of the movement of the hook switch snaps the trap off the lever, whereupon this triggers temporary switching processes regardless of the further movement of the hook switch.

In the drawing, for example, is a delay device for hook switch shown schematically.

Fig. Ι shows this device in the view;

Fig. 2 shows the hook switch in section AB according to Fig. 1 in the rest position, while

Fig. 3 shows the hook switch in the same section, but in the working position.

The hook switch 2 rotatable about the bearing screw 1 is provided with a retaining plate 3 is provided, on the tab 4 of which a trap 5 is movably attached to the axis 6. A spring 7 holds the trap 5 with her Side parts 8 against the holding plate 3 acting as a stop. When the hook switch is relieved (Fig. I, 3) the right end of the trap 5 rests on the short arm 9 of the about the axis 10 rotatable angle lever 11,

while the left end of the trap protrudes into a cutout 12 of the support plate 13. On the longer arm 14 of the angle lever 11 engages a tension spring 15, which it at Adjustment against the action of the air pump 16 into the starting position shown returns (Fig. 1, 3). If the hook switch 2 is pressed down, then it rotates the latch 5 on the arm 9 the angle lever 11 around the axis 10 until the other end of the trap 5 on the edge 17 of the support plate 13 and rotated away from the arm 9 during the further downward movement will. The right end of the trap 5 slides here from the edge of the arm 9 and releases this, whereupon the angle lever 11 moves from the tension spring 15 into the starting position is withdrawn (Fig. 2). During the longest period of reciprocation of the Arm 14 is the normally closed contact 18 due to the sliding of the pin 19 from the cocked Spring 20 open. The normally closed contact 18 is connected to the contact 21 of the hook switch 2 connected in series. When the microphone is hung on the hook switch, the contact 21 is permanently disconnected, while the contact 18, as described above, is only opened temporarily. on in this way it is achieved that the intercom station is relieved of the load on the hook switch immediately connected to the exchange and start dialing a call number immediately can without having to pay attention to an official sign. On the other hand, it will also through the delay device activated when hanging the possibility unauthorized use of the telephone station is prevented.

Claims (2)

Patent claims: i. Hook switch for self-connecting exchanges connected microphone units with restricted traffic authorization, which is equipped with a delay device equipped with the help of the hook switch to prevent the emission of inadvertent elective surges is, characterized in that one on the hook switch (2) is articulated stored trap (5) one in a known manner by air pump (16) and tension spring (15) loaded lever (11) when the hook switch is depressed moves, snaps from this after a certain time, whereupon this independent of the further movement the hook switch triggers temporary switching processes. 2. Delay device for hook g ₀ switch according to claim 1, characterized in that the latch (5) in the working position with its side parts (8) due to the action of the spring (7) against the holding g _g plate acting as a stop (3) and when the hook switch (2) is depressed, the coupling with the angle lever (11) is established. ' 1 sheet of drawings