DE406516C - Lock provided with electrical contacts for an alarm circuit - Google Patents

Description

GERMAN EMPIRE

ISSUED NOVEMBER 24, 1924

REICH PATENT OFFICE

PATENT LETTERING

- JVl 406516 - CLASS 68 a GROUP 37

(B 102677 111169a)

Fritz Bieback in Berlin.

Lock provided with electrical contacts for an alarm circuit. Patented in the German Empire on December 9, 1921.

The invention relates to one provided with electrical contacts for an alarm circuit Lock.

According to the invention, three contacts are installed insulated in the lock, of which two connected to one another in this way by the locking bolt brought into the closed position be that thereby two parallel alarm circuits are prepared and the lock housing to one pole of the alarm power source is placed. One alarm circuit is closed when one is inserted into the lock and thereby conductively connected to the lock housing, d. H. with the bolt closed to one pole of the alarm power source placed wrong key, lock pick or the like when trying to open the lock to the trained as a pin crew third lock contact comes across. If the lock against it opened with the correct key

is, the key bit goes with its cutout past the pin crew, without; touching them, even without the alarm; Close circuit. The second alarm '' circuit is closed when a contact device arranged approximately in the axis of rotation of the door is brought to completion by breaking the locked door. There are lock safety devices in which an ίο wrong key when trying to open the lock causes the closing of an alarm circuit, are known. There are also door locks in which, when the door is broken, a contact device is brought into effect and an alarm device is activated. In contrast, the subject of the invention is characterized by the combination of both fuses with the simplest arrangement of the necessary contacts and j current paths. i

The invention will be on hand of _execution: approximately described example of the drawing. In 'this Fig. 1 is a section through the lock with the circuit diagram of the alarm circuit; . 'Figure 2 is a cross section through the lock; guided along the line AB in Fig. 1; Fig. 3 shows a section along the line CD \ in Fig. 1; Fig. 4 shows the design of the j key.

From any current source I leads a | Line via the door hinge m to an I spring contact d in the lock, which is connected to a | insulated base c is attached.

When the lock bolt α is open, the current transfer is open on the one hand to the lock housing j and on the other hand to the isolated mating contact c in the lock; both current over- | Gears are closed when the bolt a 'is pushed to the left in the direction of the arrow when the lock is closed and the driver pin b (Fig. 1, 2) attached to the bolt hits the spring contact d and presses it against the contact e. i

So it is only with the lock bolt closed! on the one hand the lock housing via the contact c, the spring d and the locking pin b and on the other hand the contact e via the contact c j and the spring d connected to one pole of the power source. From the other pole of the current source I , the current is conducted in parallel via the alarm bell ρ and the panel 0 to the hinge r and from there to a contact h (Fig. 1, 3) which is insulated in the j lock. This is attached to the closing plate k for i the actual lock mechanism (as well as 1 like the other components of the safety device) by means of an insulating piece i (Fig. 3) and carries an adjustable conductive pin g ₃ through an opening in the plate k with all-round air insulation passes through and the end of which lies in the way of the key bit.

The key prepared for the lock now has a recess s at the point which must pass the end of the pin g (Fig. 4) and therefore does not touch the pin. However, another key or a lock pick will inevitably touch the invisible end of the pin and the circuit battery /, hinge in, contact c, spring d, bolt pin b, lock, key shaft, key bit, pin g. Close contact It, hinge r, panel 0 or bell p, back to battery I.

LTm to be protected even when the lock is locked and the door is opened without touching the lock, the known door contact η is connected in series with the battery and bell or panel, but in parallel with the lock contact g , that its circuit is also over the contacts d, e brought into contact when the bolt is pushed forward is guided and closed at the contact point n when the door is broken in with the lock untouched and pivoted a little.

Claims (1)

P a tent claim: Lock provided with electrical contacts for an alarm circuit, characterized by three insulated contacts built into the lock, two of which (c, e) are connected to one another by the lock bolt (a) brought into the closed position in such a way that two parallel alarm circuits are prepared and the lock housing is applied to one pole of the alarm current source (I) ; one alarm circuit is closed when a wrong key, lockpick or the like inserted into the lock and thereby conductively connected to the lock housing hits the third lock contact (g-, Ii) when trying to open the lock; the second alarm circuit is closed when a contact device (s) arranged approximately in the axis of rotation of the door is brought to completion by breaking the locked door. 1 sheet of drawings.