FI61747B - CYLINDERLAOSBEHOER FOER OEKAD UPPBORRNINGS- OCH UPPBRYTNINGSSAEKERHET - Google Patents

Description

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WuUnttU and register managed »N« hUv «k.lpe» n j. ku..lulk.taun date - 31.05.82

Patent and registration authorities Amökin utltfd och uti. * Krtft «n pubikend (32) (33) (31) Requested privilege — Bejird prlorltet 20.12.7 ^

Sweden-Sverige (SE) 7 ^ + 16187-8 (71) GKN-Stenman AB, Box 3 ^ + 3, 631 05 Eskilstuna, Sweden-Sverige (SE) (72) Erik Albert Nilsson, Eskilstuna, Sweden-Sverige (SE) ) (7M Oy Jalo Ant-Wuorinen Ab (5M Cylinder part of the lock with improved drilling and breaking strength -Cylinderläsbehör för ökad uppborrnings- och uppbrytningssäkerhet

In burglaries in villas and apartments with cylinder locks, attempts have often been made to "drill out" the cylinder lock. Drilling then usually takes place in and / or around the lock cylinder itself, because drilling in the keyhole only causes the lock pin to lock more securely, thus not achieving the desired result.

Various lock cylinders have been known in the past, the safety of which with respect to drilling and breaking strength has been improved by a strong metal part of the lock cylinder having an end bore approximately corresponding to the core of the cylinder.

U.S. Pat. Nos. 1,422,520, 2,225,703 and 3,795,123 and Swiss Patent 561,347 disclose such previously known lock cylinders.

By shaping the lock cylinder itself to include a part of the type shown, protection becomes complex as well as expensive and has limited uses.

2,61747

German patent publication 1 298 902 also discloses a lock cylinder comprising a separate frustoconical burglar guard surrounding the outside of the lock cylinder and intended to be fastened to a door containing the lock cylinder by means of fastening devices accessible from the opposite side of the door. However, the lock cylinder installed in place protrudes through the end portion of the shield and the structure thus leaves the end of the lock cylinder unprotected.

The object of the present invention is to provide a lock cylinder accessory as described above, which can be used for different types of cylinder locks and which, despite its simple shape, provides a secure protection for the lock cylinder.

An additional part of the lock cylinder according to the invention, which fulfills this purpose with its essential features, is that the inside of the body has a recess shaped according to the outer surface of the non-circular lock cylinder, whereby the body when mounted on the lock cylinder is non-rotatable.

The metal material should be so hard that it is almost impossible to drill. Suitable materials include hardened steel, various types of hardened steel alloys such as chrome steel, etc.

The pivoting or rotating plate is suitably in a groove formed in the end bore. The plate then remains rotating in place, for example. by means of a retaining ring.

According to a preferred embodiment, the metal body is arranged to be compatible with a lifting ring having a shape that naturally fits the body's own shape. For example, if the metal body has the shape of a truncated cone, the appearance of the extension ring must correspond to the truncated cone. Inside, of course, the shape may be a metal ring in the shape of a straight cylinder.

The metal frame is then intended for use interchangeably with tires of different heights. The equipment allows the same cylinder lock and cylinder part to be used with different door thicknesses, whereby the lock cylinder protrudes outside the door with different dimensions.

The metal body preferably has an insert on the lock side which cooperates with the insert of the corresponding platform ring. The cylinder part can then simply be centered on the riser ring so that it is always in the correct position. The dimensions of the extension of the extension ring are always the same regardless of the thickness of the extension ring, whereby the possibility of subsequent replacement is ensured in a simple manner.

61747

According to a preferred embodiment, the frame is provided on the lock cylinder side with, for example, two threaded recesses into which the frame fixing screws are screwed from inside the door. The cylinder part thus lacks externally accessible fastening devices or the like which could possibly be gripped in the event of violence.

The distance of the twisted cavities is preferably less than the inner diameter of the raising ring. The fastening screws of the cylinder part can thus pass through the lifting ring without hindrance, whereby the lifting ring also locks in place when the screws are screwed on from inside the door. Thus, a simple installation of both the cylinder part and the extension ring can be achieved.

Additional features of the invention are set forth below in connection with the description of a preferred embodiment. The study is performed using the attached drawings.

Figure 1 is a perspective view of a cylinder part according to the invention.

Figure 2 is a rear view of the cylinder part of Figure 1.

Figure 3 is a sectional view of a door with a cylinder lock on which a cylinder accessory and a corresponding extension ring are mounted.

Figure 4 shows a perspective view of the lifting ring.

The inner part of the cylinder, which has good drilling and breaking resistance, consists of a body 1 made of hardened steel and having the shape of a truncated cone. The outer surface is marked 1a and the substantially flat front surface is marked Ib. The front surface has a circular hole 2 in the groove made of a plate 3 made of hardened steel. The diameter of the hole 2 corresponds approximately to the diameter of the cylinder core 9 of the cylinder lock 8 (Fig. 3), and the plate 3 has a slot 4 slightly wider than the lock key 10. .

A recess 5 corresponding to the outside of the lock cylinder 8 is made in the rear side of the cylinder insert shown in Fig. 2, so that the part

A

can be mounted on the part of the lock that extends beyond the door 12.

It can also be seen from Figure 2 that the plate 3 is rotatably mounted in a groove surrounding the end bore 2 and that the plate is held in place by a locking ring 6.

If the door 12 is of such a thickness that the locking cylinder extends little or not beyond the door, the cylinder accessory may be placed directly on top of the cylinder and the door fixed to the door,. . . f 61747 with screws 7a coming from the inside, which engage the threaded cavities 7 on the back of the part.

In thinner doors, however, most of the lock cylinder extends beyond the door and in such cases a raised ring is required between the cylinder insert 1 and the door 12, denoted by reference numeral 11 in Fig. 3 and modified 11 'in its thicker perspective view in Fig. 4. continue from the outer surface of the riser ring so that the connection between said parts becomes barely noticeable. In order to guide the cylinder insert on the raising ring, it is provided with a flat circular projection 11'a which cooperates with the corresponding cylinder insert 11d.

This then becomes precisely centered on the riser ring.

The distance between the screws 7a and the threaded holes 7 with respect to the riser ring is such that the fixing screws of the part pass through the central opening of the riser ring, so that both parts come into place by tightening the screws 7a.

As mentioned above, the cylinder extension 1 can cooperate with raising rings 11 and 11 'of different heights, in which case a raising ring of suitable thickness is selected in each individual case. The riser ring is preferably of the same material as the cylinder accessory.

Cylinder attachments, which are generally in a shape other than those shown above and described in the drawings, are possible within the scope of the invention. The additional part of the cylinder can thus be parallelepiped-shaped in front of it, with a number of spaced-apart side or jacket walls, the front wall being, for example, a square, a rectangle or a polygon. In all cases, the raising ring is shaped so that its shape corresponds to the shape of the cylinder insert. If the distance between the threaded recesses of the cylinder insert is greater than in the embodiment shown, corresponding recesses must be made in the extension ring. Other variations which differ from the above are also possible within the scope of the basic idea of the invention, as set out in the appended claims.

Claims (5)

5 61 747 Claims; A lock cylinder accessory having good drilling and rupture resistance, comprising a body (1) made of high-strength metal, for example hardened steel, to be mounted on the outside of the lock cylinder (8), having a truncated cone of circular cross-section and having an approximately cylindrical cross-section. an end bore (2) corresponding to the inner part (9), comprising a rotatable or rotatable plate (3) having a slot (4) for the key (10) and made of a metal similar to the body which the body (1) forms in the lock cylinder (8) a separate part surrounding the outer part of the lock cylinder and adapted to be fastened to the door (12) supporting the lock cylinder or a similar fastening device (7a) accessible from the side opposite the frame, characterized in that the inside (1c) of the lock has a recess (5) shaped according to the outer surface of the circular lock cylinder (8), whereby the body, when mounted on the lock cylinder, is non-rotatable in this n Ahden. Lock cylinder accessory according to Claim 1, characterized in that the metal body (1) is adapted to co-operate with the elevations (11; 11 '), the shape of which naturally relates to the shape of the body (1). Lock cylinder insert according to Claim 2, characterized in that the metal body is adapted for use interchangeably with lifting rings (11; 11 ') of different heights. Lock cylinder insert according to Claim 2 or 3, characterized in that the metal body has a projection (1d) on the side (1c) of the lock (8) which is adapted to co-operate with a corresponding seat of the lifting ring (11a; 11'a). Lock cylinder accessory according to one of the preceding claims 2 to 5, wherein the metal part has, for example, two threaded holes (7) on the lock cylinder (8) side (1c) for fastening the body with a corresponding number of screws (7a) to be threaded into the holes, characterized in that the threaded holes (7) the mutual distance is less than the smallest inner diameter of the riser ring (11; 11 ').