DE2545184A1 - Drilling prevention plate for telephone lock - had freely rotatable plate carried on front of cylinder lock to cover spring - Google Patents

Abstract

The rotating cover plate is for preventing boring out of cylinder locks in coin operated automatic equipment eg in a coin operated telephone lock. The protection is of simple design. In front of the lock (4) is arranged, on the lock cylinder, a freely rotating plate (7) with a central keyhole. The diameter of this plate is greater than the keyhole (6) in the door. Axial movement of this plate is prevented by a circumferential groove on the lock cylinder. This plate is used also as a cover of the lock (4) spring chamber.

Description

Arrangement to prevent the boring of cylinder

locks.

As is known, there are several wedge surfaces on the keys of cylinder locks appropriate. When inserting a key into the cylinder of the corresponding lock through these wedge surfaces in the lock cylinder pins and from these in turn so-called coat pins raised. When all pins make the parting line between cylinders and release the jacket, the cylinder can be rotated and the lock opened. It is known that when such cylinder locks are opened forcibly, the cylinders drilled, because then the pins fall out and thus the cylinder for release a rotation.

To prevent the cylinder locks from being drilled open, one already has a hardened cap is fixedly arranged on the lock cylinder and / or in front of the spring chamber a steel pin made of hardened material is provided. The previous measures in this direction are all fixed on the cylinder or lock and can do not definitely prevent drilling with a suitable tool.

The invention is based on the object of using simple means To create an arrangement to prevent cylinder locks from being drilled open. These The object is achieved in that in front of the lock on the lock cylinder axially a freely rotatable disc is arranged with a central opening that defines the contour of the key. Such a disc covers and protects the lock cylinder, because it runs with the drill when trying to drill and is therefore not stable Provides attack surface for the drill. In contrast, it is with the known Cylinder locks with are secured with a hardened cap, possible to drill this open with a suitable tool, since the cap is firmly on the lock cylinder is arranged and therefore cannot avoid the drill by slipping away.

To prevent a corresponding cylinder lock from being drilled into the side the diameter of the rotating disk is larger than that in the door Opening provided for inserting the key. The advantage of this design consists in the fact that the slipped disc does not have to be secured and itself therefore rotate completely freely on the cylinder on which it is only loosely attached can.

To prevent axial displacement even in the event of a massive attack, the disc can be secured in a groove on the outer periphery of the lock cylinder.

According to a further development of the invention, the disc not only covers the lock cylinder, but at the same time the spring chamber of the lock.

According to a further embodiment, there is one on the first disk second disc rotatably attached, which covers the spring chamber. This makes two Independently freely rotatable components are provided that when attaching a Drill set in rotation and so a reaming under normal time and Avoid material expenditure in any case.

The invention is explained using an exemplary embodiment that is a Shows cylinder lock in side view.

A mounting bracket is preferably spotted on a door 1, a cylinder lock 4 is inserted into its recess 3. This cylinder lock is fixed by two nuts 5 so that between the door with the breakthrough 6 a gap remains for the key to be inserted and the lock. With 7 there is one free on the cylinder of the lock rotatably attached Disc referred to on which a plate spring 8 is also freely rotatable. One Guide plate 9 is secured by a washer 10 and a nut 11 on the inside of the castle. With 12 a bolt is referred to without additional Fastening means is suspended in a recess in the guide plate 9. This The bolt serves as a locking bolt either directly or via a linkage.

From the figure it can be seen that when inserting a drill through the opening provided for the key in the door to the rotatable one Disc 7 hits. Due to the friction between the drill and the disc, the Disc set in rotation and therefore offers no possibility for a punctiform Attack surface. While through the disc 7 primarily the cylinder of the lock is protected from drilling open, covers the also freely rotatable plate spring 8 the chamber of the castle.

5 claims 1 figure

Claims (5)

Claims arrangement for preventing cylinder locks from being drilled open, especially in coin-operated machines, e.g. B. MEnztelephone, d a d u r c h g e k e n n z e i c h n e t that one axially free on the lock cylinder in front of the lock (4) rotatably mounted disc (7) is arranged with a central opening which has the contour of the key. 2. Arrangement according to claim 1, d a d u r c h g e k e n n -z e -i c h n e t that the diameter of the rotatable disc (7) is larger than that in the Door opening provided for key insertion (6). 3. Arrangement according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the disc (7) in a groove on the outer circumference of the lock cylinder against axial displacement is secured. 4. Arrangement according to claim 1, d a d u r c h g e k e n n -z e i c h n e t that the disc (7) simultaneously covers the spring chambers of the lock (4). 5. Arrangement according to claim 1, d a d u r c h g e k e n n -z e i c h n e t that on the first disc (7) a second disc, preferably in the form a plate spring (8), rotatably attached, which the spring chambers of the lock covers.