DE2557151A1 - LOCK PROTECTION DEVICE - Google Patents

Description

GKN-ötenman AB

05 Eskilstuna / Sweden O c C «7 ι tr ι

I 0 ο / I 0 I.

Lock protection device

The invention relates to lock protection devices, namely in particular protective devices for cylinder locks.

In the event of violent and unauthorized entry into buildings, their Doors are secured with cylinder locks, it is often tried to to open the lock by drilling holes. As a rule, these holes are directly in the lock cylinder and / or drilled into the housing surrounding the cylinder, since drilling open the keyhole only leads to the locking or Locking pins to lock the lock more tightly, thereby the attempt is foiled.

Various types of lock protection devices are known which make it difficult to break open a lock. they consist of a hard metal portion which forms part of the lock cylinder of the cylinder lock and has a recess which rotatably accommodates a plate. The latter consists of a material corresponding to the body and has a slot for receiving it a key that fits into the lock.

Such cylinder locks are in the US patents 1 422 520, 2 225 703 and 3 795 123 as well as in the Swiss patent specification 561 347.

Due to the fact that the lock cylinder is integral with connected to one or more elements of the protective device is, the known protective devices are complicated una expensive and also have only a limited usefulness.

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The invention is based, inter alia, on the object To create lock protection device that can be used for various types of cylinder locks and with a simple construction forms an effective shield for the lock cylinder.

Such a lock protection device has according to the invention a body made of hard metal, which is formed independently of the lock cylinder, the outer portion umgib.t and on a Side of a door o. The like. By fastening means, such as Screws, can be fastened, which are accessible from the opposite side.

The metal from which the body and plate are made should be so hard that it cannot easily be drilled open can. Such suitable materials include hardened steel and various hard steel alloys such as chrome steel.

The outer profile of the metal body is preferably substantially frustoconical. In this way arise further advantages in connection with the courtesy to break the lock. In fact, it is practically impossible to use the cylindrical To grasp the device with a tool, such as a pipe wrench, in order to unscrew or bend the device.

The side of the metal body facing the lock has a Recess, which preferably corresponds to its shape according to the outer profile of the lock. The protection device then fits on that Cylinder lock. The latter helps to keep the lock in place under these circumstances and prevents it from being removed the protective device under the action of force.

The rotatable plate is advantageously seated close in a groove the outer recess. The plate is rotatably held in its position, for example by a snap ring.

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Works according to a particularly advantageous embodiment the metal body together with a spacer whose shape is adapted to the profile of the metal body. Owns the metal body a frustoconical shape, so should the outer one Cylindrical surface of the spacer also truncated cone, be trained. In contrast, the inside of the annular spacer can be cylindrical.

The metal body is designed so that it can be exchanged with Spacers of different axial dimensions can work together. This offers the possibility of one and the same thing Cylinder lock with one and the same lock protection device can be used in doors of different thicknesses, with the lock cylinder each by an amount from the outer surface the door protrudes, which changes from door to door.

The metal body preferably carries on the side facing the lock a shoulder that cooperates with a corresponding shoulder of the spacer. In this way you can Center the lock guard further on the spacer so that it is in its correct position under all circumstances occupies. The dimensions of the shoulder on the spacer are the same regardless of the thickness of the latter, so that the desired interchangeability results.

Preferably the metal body is on top of the lock cylinder facing side provided with, for example, two threaded holes to the metal body from the inside of the door through Fasten screws. The lock protection device has no fastening means from the outside of the door are accessible and are subjected to a force could.

The distance between the threaded holes is advantageous smaller than the inner diameter of the spacer. This offers

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the possibility that the fastening screws of the lock guard go freely through the spacer. You then also attach the spacer in its correct position, when they are attracted from the inside of the door. on in this way, the lock protection device can be mounted together with the spacer in a simple and reliable manner will.

Further features and advantages of the invention emerge from the following description of a preferred embodiment in connection with the accompanying drawings. The drawing shows in:

Figure 1 is a schematic perspective view of a lock protection device according to the invention;

Figure 2 is a schematic view of the rear of the device according to Figure 1i

Figure 3 is a schematic section through a door with a Cylinder lock on which a lock protection device with a spacer is placed;

Figure 4 is a schematic perspective view of a spacer .

A lock protection device, which increases the drilling and break-open security of a cylinder lock, consists of a body 1 made of hardened steel, which has a frustoconical shape. The outer surface 1a of the body 1 has a substantially flat end face 1b with a circular recess 2 provided therein. The latter rotatably receives a plate 3 made of hardened steel in a groove which runs around the circumference of the recess. The diameter of the recess 2 corresponds approximately to that of the cylindrical core 9 of the lock cylinder 8 according to FIG.

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The rear of the lock protection device is shown in FIG. 2 provided with a recess 5, which in such a way with the outer profile of the lock cylinder β coincides since; 3 the device on the part of the lock cylinder protruding outwards from the door can be put on.

Figure 2 shows the plate 3, which sits rotatably in the current around the circumference of the recess groove 2, wherein the plate is held by oinem snap ring 6 in the hat.

If the door 12 is so thick that the lock cylinder S protrudes only slightly or not at all from the door, the lock protection device can be mounted directly above the cylinder and fastened to the door by means of screws 7a. The screws are screwed in from the inside of the door and engage in threaded holes 7 on the back of the cylindrical device.

In the case of a thinner door, however, a longer section of the lock cylinder 8 protrudes outward from the door. A spacer will then be arranged between the lock protection device 1 and the door 12. FIG. 3 shows such a spacer. Furthermore, FIG. 4 shows a modified spacer 11 * of greater axial extent in perspective. The outer surface 1a of the lock protection device should merge essentially continuously into the outer surface of the spacer in such a way that the transition point between the spacer and the lock protection device can only be perceived with difficulty. In order to guide and center the lock protection device on the spacer, the latter is provided with a flat, circumferential shoulder 11a, which cooperates with a corresponding shoulder 1d of the device 1. This results in a precisely centered mount on the spacer.

The distance between the screws 7a or the threaded holes

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is selected with regard to the inner diameter of the spacer so that that the fastening screws of the lock guard pass through the central opening of the spacer. These two elements are then held in place by the screws 7a Location held.

As already mentioned, the lock protection device 1 with spacers 11 and 11 'of different axial extension work together. Accordingly, a spacer of suitable thickness can be selected for each application. The spacer is preferably made of the same material as the lock protection device.

The invention provides space for lock guards that differ are formed from the above embodiment. Thus, as seen from the front, the device can have a polygonal shape with a plurality of side surfaces which interlock with one another pass over. The front surface is then, for example, square, rectangular or polygonal. In all cases, the spacer is designed so that its shape is that of the lock guard is equivalent to. When the distance between the threaded holes of the Lock protection device is larger than was the case in the embodiment described, so you can see corresponding Holes in the spacer. Further modification options are also given within the scope of the invention.

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Claims (10)

GKN-Stenman AB ^ Z O 5 7 I 5 I 05 Eskilstuna / Sweden PATENT CLAIMS 1.J lock protection device with one the outer surface of one Lock cylinder superimposed hard metal body, which is an approximate has the core of the lock cylinder corresponding recess, and with a rotatably seated plate in the recess, the consists of a metal corresponding to the metal of the body and has a slot for the key of the lock, characterized, that the hard metal body (1) is independent of the lock cylinder (8) formed component which surrounds the outer portion of the lock cylinder and on one side of a door (12) ο the like. can be fastened by means accessible from the other side of the door. 2. Device according to claim 1,
characterized, that the outer profile (1a) of the hard metal body (1) is essentially Is frustoconical. * 3. Device according to claim 1 or 2, characterized in that that the lock cylinder (8) facing side of the hard metal body (1) has a further recess (5), the shape of which is adapted to the outer profile "of the lock cylinder. 4. Device according to one of claims 1 to 3, characterized in that that the plate (3) sits in a groove formed in the recess (2) and is held by a snap ring (6)! 60 9 827/028 3 5. Device according to one of claims 1 to 4, characterized in that the metal body (1) together with a spacer (11, 11 ') η v / i rkt, the shape of which corresponds to the profile of the metal body. 6. Apparatus according to claim 5, characterized in that the metal body (1) interchangeably on spacers (-11,11 ') • is adapted to different thicknesses. 7. Apparatus according to claim 5 or 6, characterized in that the surface of the metal body directed against the lock during operation (1) has a shoulder (ld) with a corresponding Shoulder (I1a, 11'a) of the spacer (11,11 ·) cooperates. 8. Device according to one of claims 1 to 7, characterized in that the side of the metal body (1) directed against the lock during operation has threaded holes (7) for fastening by means of a corresponding number of screws (7a) engaging in the threaded holes. 9. Apparatus according to claim 8, characterized in that the distance between the threaded holes (7) is smaller than the inner diameter of the spacer (11, 11 '). 10. Spacer for a lock protection device according to one of claims 1 to 8, characterized in that the outer surface of the spacer (11, 11 ') to the outer surface the lock protection device (1) is adapted and, starting from the latter, expanded, and that the operation against the surface of the spacer facing the lock protection device has a shoulder (11a, 11'a) for cooperation with a corresponding one Has shoulder (ld) of the lock protection device. 609827/0283