DE381402C - Alarm lock with key holder - Google Patents

Description

Locks in which a device is inserted inside the lock body Blocking false keys against withdrawal are already known. An intruder is but it may still be possible to remove the key undisturbed, be it because the key broke off and its individual parts were out of the lock removed or that the lock itself unscrewed and after removing the key is rescheduled.

In the subject matter of the invention, this is impossible, since when you insert one If the wrong key is used, an electrical circuit is immediately closed, which At a suitable place a bell or the like keeps in action until the wrong key, which is blocked against withdrawal, can be removed again by a competent person.

In the drawing, an exemplary embodiment is shown in five figures; it shows:

Fig. Ι an interior view with plugged in, matching key for the lock,

Fig. 2 shows the cross section AB to the left, Fig. 3 the same seen to the right,

Fig. 4 Section CD of the

Fig. S, which shows the interior view according to Fig. 4 with the key bit caught (slightly enlarged).

The Akrmschloß with key scavenger is α of an inner cam plate which c and d together with the pillars and the outer lock plate b in a known manner forms the lock body. The two lock plates α and b are, as is known, insulated from one another by a vulcanized fiber plate e or the like. A hollow key f with an insulating sleeve h is used, which is guided by a pin g fixed to the plate α. The beard of this key f shows a bar i, but the working part 0 of the beard is only kept so wide that it can still slide comfortably through it in the slot guide η of a guide body n ^1.

On the lock plate b a guide pin 2 is attached, which the lock bolt ρ dictates the straight path, and it is the

the rear part of the bolt ρ is provided with an extension 3 which has a cutout into which the beard attachment 0 enters when the lock is opened. A helical spring /, to which an articulated pressure plate k is connected, acts against the inner end of the bolt p and is supported against the pillar d. The plate k is guided in a slot 4 (Fig. I).

The device for catching a wrong key consists of a flat slide κ protruding in the triggered position between the key bit and the keyhole, which at its lower end has a thicker part u ¹ , which is bent at right angles, at the same time designed as a spring plate and provided with an incision t the action of the spring ν stands.

The detection and triggering of the safety gear is carried out by two mutually engaged rockers 7 and 8 which are rotatable about the pins 5 and 6, the latter of which by a spring 6 "in the position of use in the, incision t of the right-angled part u ^{1 of} the slide u is printed and thus keeps the slider in the position of use, j To free the wrong key I is used between the guide body n ¹ and: the pillar d on a support 9 disk v, which protrudes in the manner of a tendon j. 1 * and has a ring-shaped structure 10 in order to serve as a one-sided fastening of a return wire s connected to the pin 11 and laid around the ring part 10 I, while the other end hangs ^{from the part κ 1 of} the slide 11 is. ;

The mode of operation of the lock is as follows:

If you want to open the lock with a matching key f , so move the bolt ρ back from the position according to Fig. 1 in the direction of the arrow, the key / "according to Fig. 2 is inserted until the beard projection 0 in the slot guide η Finds free passage to move the bolt back in the direction of the arrow against the action of the spring /. The bolt is secured in the open position by a device not specifically mentioned here. An attempt was made, however, with a differently shaped, ie not matching the lock Key, which is generally not equipped with an insulating sleeve Λ to open the lock, so turning this key in the X normal direction is not possible because the slot guide η prevents the passage of the bit 0, provided that the width of the key bit is greater * than the clear width of the slot guide n. Both in this case and if a key that is weaker than the slot guide Elbart should be used, there is a metallic contact of the key shaft with the plate a, ie closure of the electrical circuit and immediate sounding of an electrical bell that is included in the circuit.

Since when inserting a wrong key there is initially a certain resistance even in the normal direction of rotation, the person concerned tries habitually to turn the key to the other side, but the beard of the wrong key tilts the rocker 7 and overcomes the spring 6 "also brings the rocker 8 out of its locking position relative to the slide u , so that it snaps forward under the influence of the spring τ ¹ with the flat part of the slide u behind the false beard and the keyhole (Fig. 5), so that the key can no longer be pulled out. So that the rocker 7 cannot disengage too far, so that, for example, the key bit (Fig. 5) could pass the tip of the rocker 7, a stop pin r is attached behind it so that the safety catch when using a correct key to prevent the one guide plate for the slide 11 is slightly extended to the remote part i of the Keystone's 0 to serve as a stop and to limit its too far movement in this direction.

If the slider u is snapped forward, the wrong key can only be removed by someone who knows the interior of the lock by inserting a pointed pin through an opening w (Fig. 4) into the inside of the lock, the rotary disk ν by pressing down on the attachment χ twisted around the bolt 12, ie the wire s is rolled up on the ring-shaped structure 10 and so the slide u, u ^{1 is} brought back.

Claims (1)

Patent claim: Alarm lock with key catcher, characterized in that when inserted an alarm device comes into effect after an unsuccessful opening attempt with If the wrong key is turned back beyond the inserted position, use a key catcher is triggered. 1 sheet of drawings.