DE418589C - lock - Google Patents

Description

GERMAN EMPIRE

ISSUE IT SEPTEMBER 1925

REICH PATENT OFFICE

PATENT LETTERING

- JVi 418589 - ■ CLASS 68 a GROUP 37

(G 60995 m \ 68 <&)

Walter Grahmann in Neukölln.

Lock.
Patented in the German Empire on March 23, 1924.

With security locks it is known that only the complete pushing back of the lock

the pushing back of a bar prevents the key '■ gels, but also a Alarmvor-

sel receives a certain measure in the wrong direction in readiness. At the instant

device to turn and thereby a blocking ί against correct turning of the key this

repeal which, if it persists, is not l consequently put into action. These

Lock security contains a number of plates which are partly coupled together, two Control pawls and a control slot.

The invention also uses the initial one incorrect turn of the key, in order to fully retract the bolt to enable; with her too, if the key and the this caused the bolt to move back initially to close an alarm circuit. The new facility, however, is simpler and more reliable than the older one.

Furthermore, when a bolt is pushed back, there is also an inclined position * 5 level known for locks. But it serves there to turn one in the lock housing to rotate bearing contact arm so that it closes the alarm circuit, in the case of the present In contrast, closed a contact rotatably mounted on the Rieao gel again to exercise the effect required of it to empower.

The drawing illustrates an exemplary embodiment of a safety lock with two Latches.

Fig. Ι shows the latch in the open position and Fig. 2 in the locked position. Fig. 3 shows the lock half opened, Fig. 4 the process when it is opened properly of the lock and Fig. 5 is a vertical section through a detail of the lock.

In the case of the lock, a nose C ² provided on an arm c ^{1 of} the upper bolt c prevents the lower bolt b from being pushed back completely as long as the upper bolt c is not pushed back completely. This is only mentioned for the sake of understanding the drawing, but, as it is known, does not form part of the invention. On the upper bolt sits an arm I, which conducts an electrical current, rotatable around a horizontal pin ^. When the bolt c is in the locked position, the arm i hangs down freely. If the bolt c is pushed back by means of the key x by acting on a tab c ^{3 of} the bolt while the arm / 'is in the position shown in Figs. 2 and 3, the arm / lies before the Bolt c has been pushed back completely against a stop g attached to the rear wall h of the lock housing α , which is in the alarm circuit; is switched on; the alarm bell sounds immediately.

If the bolt c is to be pushed back all the way, the arm / must be lifted j by initially incorrectly turning the key χ so that it passes over the contact g , which is isolated on the rear wall h of the lock, as indicated in Fig. 4 . If the latch c is then through! correct turning the key all the way back! pushed, the stop arm /, which is held in the raised position by friction, slides along the inclined plane ti which is attached to the rear wall h of the lock housing. Here the stop / moves out of the area of friction and finally falls down (Fig. 1).

As soon as the bolt c is brought back into the locking position, the arm i slides over the contact piece g, lifting it slightly, and finally falls back into the position shown in Fig. 2, in which it was incorrectly handled of the key prevents the bolt c from being pushed back completely.

Instead of friction, the stop / can also be maintained in the raised position by other means that allow it to be easily moved back through the inclined plane η. Furthermore, instead of securely attaching the inclined plane η to the housing a, h of the lock, it can also be attached to the arm /; in this case it is sufficient to attach a pin to the rear wall h of the housing at the location of the wedge-shaped body η.

Claims (1)

Patent claim: Lock with initially incorrect rotation of the key, characterized in that during this rotation the key moves an electrically conductive stop (/) attached to the bolt (c) in such a way that this initially occurs when the bolt is pushed back by the subsequent correct rotation of the key passes a fixed contact (g) serving to close the alarm circuit, but then, while overcoming the force holding it in the raised position , is turned back so much by a guide surface (ti) that it can take up its initial position again under its own weight . 1 sheet of drawings.