DE2821456C2 - Switch lock for telephones - Google Patents

Description

45

The invention relates to a switch lock for telephones in which in the closed state Circuit is short-circuited.

In order to prevent a telephone set from being used in an unauthorized manner, usually the number switch or the keypad of this device with the help of a switch lock with a Normally open contact short-circuited. In the previously known systems, this is done in that a key is in the lock is inserted, rotated, for example, 180 ° and removed again. Opening the lock is done in the same way.

The object of the invention is to create a switch lock compared to the known designs, that it is inexpensive and easy to manufacture and still & o is largely secured against unauthorized opening. In order to achieve this goal, completely new paths had to be treaded, in particular was consciously on a turning movement of the key is dispensed with.

In a switching mechanism for telephone sets, wherein ^b5 which in the closed state, a circuit is short-circuited, it is inventively achieved by acting on contacts lock insert is formed key-shaped and is held by locks in the lock housing so that depressed to complete the lock insert and in this Position is held latching and that by inserting a key without turning the lock is released and the lock insert comes back to the starting days.

An advantageous embodiment of the invention provides that locks are attached in the lock housing are and the lock insert has recesses in the the locks click into place in their initial position.

According to the invention further recesses are made in the lock insert into which the locks click into place in the closed position.

In a particularly advantageous manner, the key and the locks are provided with bevels of this type designed such that the locks out of the recesses through the inserted key are pushed out and when you let go or remove the key the lock insert into the Returns to the starting position.

The invention further provides that the lock housing, the contact spring and which are mounted to be connected to contacts on a printed circuit board.

In an advantageous manner, the arrangement is made so that the locks have latching lugs that are in one Angle of about 15 ° are arranged.

An embodiment of the invention is shown in the drawing and will be described in more detail below described. It shows

F i g. 1 shows a switch lock according to the invention in FIG Side view in section,

F i g. 2 the switch lock in the front view in section in the starting position,

F i g. 3 the switch lock according to FIG. 2 in the actuated position with the key inserted.

As the F i g. 1 to 3 show, the lock housing 2 is attached to a printed circuit board 6 in that it is with Latching lugs 7 is inserted into corresponding openings in the circuit board and engages. In the Lock housing 2 is the key-shaped lock insert

I pushed in until the locks 21 and 22 with their locking lugs 23, 24 in the recesses

II and 12 fall and this against pulling out to back up. The locking lugs 23 and 24 are arranged at an angle of about 15 ° to the horizontal. Of the Key-shaped lock insert 1 protrudes through recesses 8 in the apparatus housing 9.

A contact spring 4 which can be pivoted through the lock insert 1 is also attached to the circuit board 6 and the contacts 5 to be connected by the contact spring. The contact spring 4 and the contacts 5 are simultaneously with other components of the circuit board by soldering in a swallow with this tied together.

In order to prevent the telephone set from being used in an unauthorized manner, it is locked in a simple way by pressing the button-like lock insert 1. The slide Latches 21 and 22 with their detents 23 and 24, respectively, through the 15 ° bevel from the recesses 11 and 12 and fall into the recesses 13 and 14 after further depressing the lock insert (Fig. 3).

The contact spring 4 is moved down from the lock insert 1 through the edge 15 and lies against the Contacts 5 of the circuit board 6. The normally open contact is closed as a result. The lock insert 1 can now

due to the latches 21 and 22 cannot be withdrawn.

To open the lock and thus the contact 4.5 again, a key 3 is in the until it stops Lock insert 1 inserted

Without turning the key 3, the locks 21 and 22 are achieved via the bevels 31 and 32 with their locking lugs 23 and 24 pushed out of the recesses 13 and 14 and when released or Withdrawing the key, the lock insert 1 reverses, driven by the restoring force of the contact spring 4 back to its starting position (FIG. 2).

A lock hierarchy can be created by making minor modifications to the key 3 and the lock insert 1 build up.

For this purpose i sheet of drawings

Claims (6)

Patent claims: 1. Switch lock for telephones in which a circuit is short-circuited when closed is characterized in that the lock insert (1) acting on contacts (4) Is key-shaped and held in such a way by locks (21, 22) in the lock housing (2) is that to complete the lock insert (1) depressed and latching in this position ι ο is held and that by inserting a key (3) without turning the locks (21, 22) are released and the lock insert (1) returns to its original position 2. Switch lock according to claim 1, characterized in that the lock housing (2) locks (21, 22) are attached and the lock insert has recesses (11, 12) into which the. Latches (21,? 2) click into place in the starting position. 3. Switch lock according to claim 1 and 2, characterized in that further in the lock insert Recesses (13, 14) are attached into which the Engage the locks (21, 22) in the closed position. 4. Switch lock according to claim 1 to 3, characterized in that the key (3) with such Inclines (31, 32) is provided and the locks (21, 22) are designed such that by the inserted key (3) the locks (21, 22) pushed out of the recesses (13, 14) and when the key (3) is released or removed, the lock insert (1) returns to its starting position returns. 5. Switch lock according to claim 1, characterized in that the lock housing (2), the contact spring (4) and the contacts to be connected (5) are mounted on a circuit board (6). 6. Switch lock according to claim 1 and 2, characterized in that the locks (21, 22) Wear locking lugs (23, 24) which are arranged at an angle of about 15 °.