EP1464778B1 - Cylinder lock - Google Patents

Abstract

A lock has a cylinder (1) with a cylinder core (2) that incorporates tumbler holes (3) for the housing and core pins. The core pins are of different shape and diameter. One of the tumbler holes has a housing pin of diameter a. One of the other tumbler holes has a housing pin with a head of diameter b, and a shaft of diameter c. The largest diameter is directed towards the core hole, and c is less than a, and a is less than b.

Description

The invention relates to a lock cylinder with a cylinder core arranged rotatably therein and tumbler bores located in the lock cylinder and in the cylinder core, comprising housing bores and core bores which receive housing pins and core pins according to the preamble of patent claim 1.

Conventional lock cylinder systems are based on pin tumblers, consisting of core and housing pin and the tumbler spring.
Usual systems have 5, 6 or 7 pin tumblers. Methods exist for opening such pin cylinders without the presence of the authorized key, so-called picking methods. On the other hand, there are also methods to complicate or prevent "picking". These include paracentric key channels; Housing pins that simulate parting lines between core and housing pin and additional, different types of tumbler elements.

From the DE 612 893 C a lock cylinder with the features of the preamble of claim 1 is known, wherein both housing pins as well as Kemstifte can be designed dumbbell-like. The maximum diameter of all housing or core pins is the same.

Object of the present invention is to make conventional Zuhaltungssysteme pickicherer than it is possible today with known methods and thereby achieve the pick safety with simple means.

This object is achieved according to the invention in a lock cylinder with a rotatably arranged in this cylinder core and in the lock cylinder and cylinder lock tumblers consisting of housing bores and core holes, the housing pins and Kemstifte record.wobei housing pins housing pins of different diameters and different shape are arranged, wherein at least one of the housing bores has a housing pin with the diameter a and at least one other housing bores has a housing pin having a head with the diameter b and a shaft with the diameter c, wherein the larger diameter faces the core bore, characterized in that the condition applies:

The shape of the housing pin with the diameters b and c, for example, be dumbbell-like or mushroom-like.

It is particularly advantageous if the core pins also have a diameter a.

• Fig. 1: das Zuhaltungsprinzip mit Kern- und Gehäusestift und Zuhaltungsfeder in Ruheposition;
• Fig. 2: eine Anordnung wie in Fig. 1, jedoch Zylinderkern unter Drehspannung gesetzt;
• Fig. 3: wie Fig. 2, jedoch ohne Darstellung der Zuhaltung mit Öffnungsmaß A;
• Fig. 4: wie Fig. 1 und 2, die Zuhaltung in Offenstellung;
• Fig. 5: wie Fig. 4, jedoch einen Hantelstift als Gehäusestift;
• Fig 6: einen verdrehten Zylinderkern, blockiert beim Öffnungsversuch durch Ausbildung des Gehäusestiftes gemäß Erfindung
• Fig. 7 und 8: die Gehäusestifte mit der Dimensionierung.

The invention will be explained below with reference to the drawings. Showing:

• Fig. 1 : the tumbler principle with core pin and housing pin and tumbler spring in rest position;
• Fig. 2 : an arrangement as in Fig. 1 , however, cylinder core set under torsional stress;
• Fig. 3 : as Fig. 2 , but without representation of the tumbler with opening dimension A;
• Fig. 4 : as Fig. 1 and 2 , the tumbler in open position;
• Fig. 5 : as Fig. 4 but a dumbbell pin as a housing pin;
• Fig. 6 : a twisted cylinder core, blocked in the opening attempt by forming the housing pin according to the invention
• FIGS. 7 and 8 : the housing pins with the dimensions.

In the figures, the lock cylinder housing with 1, the cylinder core with 2, the tumbler holes with 3, more precisely, the housing bore with 4 and the associated core hole is denoted by 5.
The housing pins are designated 6 and 7 and the core pins 8.

Measures against the picking up of pin cylinders are in competition with further developed picking methods. Differently shaped housing pins or core pins are effective only to a limited degree.
Simple methods generally show only a gradual handicap but no full protection. This is due to the fact that when turning the cylinder core 2 against the cylinder housing 1 in the tumbler holes 3 an opening A (opening between staggered Kem and housing bore) - see Fig. 3 - remains of the blocking pin (s), which is the same for all other holes in this row.
The opening A is formed by blocking the core rotation by the housing pins 6 with the diameter a - see Fig. 2 -.

With some probability it is possible to move all other tumblers with the dimension a through the "openings" of the other tumbler holes.
It is only a matter of skill and procedure to come to a closure.
The inventive idea is that there are housing pins 6 with a diameter a and specially shaped housing pins 7 - see Fig. 8 - (Dumbbell pins, mushroom pins) whose thicker end (s) is greater than the dimension a and is tapered in the shaft.

When picking the cylinder core 2 is first set under rotary tension. As a result, the dimension A is generated.
In the subsequent attempt to bring the tumblers simultaneously or successively in the open position, the tumbler blocks with housing pin after Fig. 8 the opening process, because the mushroom pin with diameter b forcibly gets stuck on the dividing line - see Fig. 6 - For a, b, c the condition applies: c <a <b.

Claims (4)

1. A cylinder lock (1) having a cylinder core (2) which is rotatably arranged therein and tumbler bores (3) which are located in the cylinder lock (1) and in the cylinder core (2) and which consist of housing bores (4) and core bores (5), which tumbler bores (3) receive housing pins (6, 7) and core pins (8), wherein housing pins (6, 7) of different diameter and different form are arranged in the housing bores (4), wherein at least one of the housing bores (4) has a housing pin (6) with the diameter a and at least one other housing bore (4) has a housing pin (7) having a head with the diameter b and a shank with the diameter c, wherein the larger diameter faces the core bore (5), characterised in that the condition: $$\mathrm{c}<\mathrm{a}<\mathrm{b}$$

   

   
   is valid.
2. A cylinder lock (1) according to claim 1, characterised in that the housing pin (7) having the diameters b and c is dumbbell-like.
3. A cylinder lock (1) according to claim 1, characterised in that the housing pin (7) having the diameters b and c is mushroom-like.
4. A cylinder lock (1) according to any one of the preceding claims, characterised in that in addition to the housing pin (6) with the diameter a, the core pin (8) also has a diameter a.

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