DE8912974U1 - Lock cylinder - Google Patents

Description

·

DI PL.-1 NG. LOTHAR PATE NT TA N WA LT

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se Hagen. CTRESEMANNSTRAssE is O ₂ . November 1989

^KISSS: Attorney file 88097/B

Utility model application

Applicant: Burg-Wächter KG. Alfred Lüling

Lock cylinder

^ The innovation concerns a locking cylinder which has a cylinder housing, a cylinder core which can be rotated in the cylinder housing after overcoming several pin or plate tumblers, and a drill protection in the form of a protective pin made of hard material which penetrates the intersection area between the plane in which the tumblers are arranged and the outer surface of the cylinder core, is held in a bore in the cylinder housing and is guided in a gap in the cylinder core.

According to DIN 18252 , a locking cylinder is an interchangeable assembly to be attached to a lock case, which consists of a cylinder housing, cylinder core, several pin tumblers and the locking bit and which transforms a simple lock into a cylinder lock that meets higher security requirements. The cylinder housing can be round, oval or profiled. Since the parts of the locking cylinder are made of relatively soft material - e.g. brass, bronze alloys - it is possible to manufacture such a

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To prevent unauthorized opening of a cylinder lock by drilling it open, it is known that a drill protection device in the form of pins made of hard

£ Material in the particularly vulnerable area against

'% to use the reaming, this is the cutting area

I between the plane in which the locking devices are arranged

I and the material surface of the cylinder core.

f- With a known locking cylinder of the initial

1 mentioned type (cf. DE-PS 408 572) is the protective pin

I either in the plane of the tumblers parallel to them

Sv, &iacgr; ) or in a plane perpendicular to the plane

&psgr;: of the locking devices. In these arrangements, the

The space already small for the accommodation of the locking devices is additionally limited by the protective pin

■ claimed. To form the protective pin as a sleeve that ' surrounds one of the tumblers, as is also known

: ^; is, (cf. DE-OS 29 23 598) , partially solves the

Space problem, but leads to concessions to the

■ Effectiveness of the anti-drilling protection.

% This is where the innovation aims to remedy the situation. The innovation

Q is based on the task of providing anti-drilling protection

'·. ,-% of the type mentioned above in such a way that one &igr; " is largely free when it is placed in the locking cylinder js, without loss of its effectiveness

According to the innovation, this task is solved by arranging the protective pin at an acute angle both to the plane of the locking devices and to a plane perpendicular to the plane of the locking devices.

In the new design, the protective pin made of hard material is held firmly in the hole, i.e. cannot move axially against the action of a spring. The protective pin cannot therefore be pushed out of the critical area against the action of the spring. The protective pin runs perpendicular to the axis of rotation of the cylinder core. A gap must therefore be made in the cylinder core to accommodate the protective pin, which is designed as part of the shell of a circular cone. The gap in the cylinder core covers an angle that is equal to the closing or opening angle of the cylinder core. The protective pin hole in the cylinder core can be guided past the keyway or through the keyway. Nevertheless, the protective pin cannot be pushed inwards, as it would then rest against the bottom of the gap. In order to overcome the anti-drilling protection provided by the protective pin, it must therefore be drilled through, which is difficult to do with the hard material used. Drilling in the area next to the critical area mentioned here can lead to the locking mechanisms remaining effective, i.e. the cylinder core cannot be turned. On the other hand, this area is also partially protected due to the largely free choice of the arrangement of the protective pin.

An example of the innovation is shown in the drawing and is described in more detail below. It shows:

Figure 1 shows a padlock in elevation; Figure 2 shows a side view of the padlock shown in Figure 1;

Figure 3 shows an enlarged section of the padlock shown in Figure 1 with several pin tumblers and an anti-drilling pin;

Figure 4 shows an enlarged section of the padlock shown in Figure 2 with the pin tumblers and anti-drilling pin shown in Figure 3;

Figure 5 shows the front view of the padlock shown in Figure 3 in the direction of the keyway - view X -.

The padlock chosen as an example has a cylinder core 1 that can be rotated in a cylinder housing 2; in addition, a shackle 3 that is locked in the cylinder housing 2 and is released after the cylinder core 1 is actuated. Between the cylinder core 1 and the cylinder housing, several pin tumblers 4 are provided. A locking bit (not shown) is attached to the inner end of the cylinder core 1, with the help of which the shackle 3 is released.

The pin tumbler 4 forms a locking device in the locking cylinder 1, 2 consisting of core pins 41, housing pins 42 and pin springs 43, which only allows the rotation of the cylinder core 1 in the cylinder housing 2 if the

Key is inserted and in doing so the core pins and housing pins 42 are displaced so that their separation plane touches the outer surface 11 of the cylinder core 1. If the locking cylinder 1, 2 is part of a master key or central locking system, the pin tumblers 4 contain one or more mounting pins in order to create the multiple separation planes required for the function. The cylinder core 1 is operated by means of a key (not shown) which is inserted into a key channel 14, that is an opening in the cylinder core 1 for receiving the key, which has a profiled cross-section to ensure that it is securely stored. A key notch is provided on the narrow side of the key, these are notches whose number and pitch are the same as the pin tumblers of the associated locking cylinder 1, 2 and whose depth is selected from a number of equal steps and is matched to the cylinder core outer surface 11 with the length of the associated core pins 41.

Instead of the pin tumbler 4, a plate tumbler can also be provided.

The parts of the locking cylinder 1 described so far, including the pin tumbler 4, consist of a relatively soft material, for example brass or a bronze alloy. In the area of intersection between a plane 44 in which the pin tumblers 4 are arranged, and the outer surface 11 of the cylinder core 1, the lock can therefore be opened by unauthorized drilling. To prevent this, a

Protective pin 5 made of hard material is held in the cylinder housing 2 in a bore 22 and guided in the cylinder core 1 in a gap 12 so that it penetrates the aforementioned cutting area.

The guidance of the protective pin 5 is shown in Figures 1 to 5: the protective pin 5 is arranged at an acute angle both to the plane of the pin tumblers 4 and to a plane perpendicular to the plane of the tumblers. Or to put it another way: the protective pin 5 runs transversely to the axis of rotation 13 of the cylinder core 1, which can be rotated in the cylinder housing 2. This guidance of the protective pin 5 provides the greatest possible security for the locking cylinder. The gap 12 in the cylinder core is designed like the shell of a circular cone over an angle that is equal to the angle of rotation of the cylinder core 1 for the - correct - opening and closing of the padlock.

The term "protective pin" should not only include elements of cylindrical design - as in the exemplary embodiment - but also elongated elements with a cross-section other than circular; including plate-shaped elements that are used in locking cylinders with plate tumblers.

Claims (1)

DI PL.-1 NG. LOTHAR PATENT ATTORNEY '' ** L·''&eegr;' -- ·· ·· 5&bgr; HAGEN. STREiEMANNSTRASSE 15 Q2 . NOVellber 1989 TELEPHONE (0 23 31) 2 83&Ogr;2 Fax (02331) 31280 Attorney file 88097/B Utility model application Applicant: Burg-Wächter KG. Alfred Lüling Protection claims f> _t Lock cylinder comprising a cylinder housing, a in which · Cylinder housing has a cylinder core that can be rotated after overcoming several pin or plate tumblers and a drill protection in the form of a protective pin made of hard material that penetrates the intersection area between the plane in which the tumblers are arranged and the outer surface of the cylinder core, is held in a bore in the cylinder housing and is guided in a gap in the cylinder core, characterized in that the protective pin (5) is arranged at an acute angle both to the plane (44) of the tumblers (4) and to a plane perpendicular to the plane of the tumblers.