EP0815336A1

EP0815336A1 - Rotary locking cylinder for a safety lock

Info

Publication number: EP0815336A1
Application number: EP96904703A
Authority: EP
Inventors: Ernst Keller
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-03-20
Filing date: 1996-03-08
Publication date: 1998-01-07
Anticipated expiration: 2016-03-08
Also published as: WO1996029492A1; EP0815336B1; AU4874196A; US5931036A; DE59601078D1; ATE175255T1

Abstract

PCT No. PCT/CH96/00089 Sec. 371 Date Sep. 18, 1997 Sec. 102(e) Date Sep. 18, 1997 PCT Filed Mar. 8, 1996 PCT Pub. No. WO96/29492 PCT Pub. Date Sep. 26, 1996The rotary locking cylinder described has a stationary part (2) and a rotating part (3) plus several tumblers (8) each with a core pin (10) and a housing pin (9). Mounted in the rotating part (3) is at least one locking element (22) which can be displaced approximately at right angles to the core pin (10) of a tumbler (8) and in its position of rest engages in a recess (20) in the stationary part (2). The recess (20) in the stationary part (2) has a control surface (19) designed so that, when the unlocked stationary part (2) is rotated, the locking element (22) is moved towards the core pin (10). Machined in the surface (10b) of the core pin (10) is a groove (12) such that, with the core pin (10) inserted, after the rotating part (3) has rotated through a relatively small angle, the locking element (22) can be pushed far enough into the groove (12) for it to be lifted out of the recess (20) in the stationary part (2) and, with the core pin (10) not inserted, the locking element (22) essentially cannot be pushed out of its position of rest and rests against the surface (10b) of the core pin (10).

Description

Rotary lock cylinder for a security lock

The invention relates to a rotary lock cylinder for a security lock, with a stator and a rotor and a plurality of tumblers each having a core pin and a housing pin.

Rotary lock cylinders of this type are generally known. To enable the rotor to rotate, the tumblers are arranged with a key inserted into the key channel. The security of these rotary lock cylinders can be affected by the following unlocking method. In this case, the rotor is clamped around its axis of rotation with a certain torque using an intrusion tool, and at the same time the tumblers are moved radially outward by vibration until all the housing pins lie behind the shoulder of the rotor formed by the rotation and the rotor can also be turned without a key. The prevention of this unlocking method was previously complex.

The object of the invention is to improve the security against unlocking of a generic rotary lock cylinder. The rotary lock cylinder should nevertheless be inexpensive to manufacture and functionally reliable. Unlocking security is understood here to mean the degree of aggravation which stands in the way of a non-destructive attempt to classify the tumblers without knowing the locking code. In particular, the invention is intended to improve the security against unlocking with regard to the unlocking method mentioned above.

The object is achieved in a generic rotary lock cylinder in that at least one locking element is mounted in the rotor, which can be displaced approximately transversely to a core pin of a tumbler and, in its rest position, engages in a recess of the stator in that the recess tion of the stator has a control surface, such that when the unlocked rotor is rotated, the locking element is moved against the core pin, that a recess is worked into the core pin on its circumference, such that when the core pin is in place after the rotor has been rotated about one comparatively small angle, the locking element can be inserted into the groove until it is lifted out of the above-mentioned recess of the stator and that when the core pin is not arranged, the locking element essentially is not displaceable from the rest position and is present on the outside of the core pin.

In the rotary lock cylinder according to the invention, the rotor can only be rotated if both the housing pins and the core pins are arranged. If a core pin is not arranged, the locking element working together with this cannot be moved from the rest position into the unlocked position. If all the core pins have been arranged, the recesses in the core pins are aligned such that the locking elements can be displaced and can engage in these recesses. It is essential that the locking elements only engage in the recesses in the core pins when the rotor has been rotated through the comparatively small angle that is common during tensioning. In the above-mentioned unlocking method, the locking elements cannot therefore be used to arrange the core pins. With the unlocking method, only the housing pins can be classified, but not the core pins. The core pins are therefore always disordered in the corresponding bores in the rotor and it is highly unlikely that all the core pins happen to be at the same time in the positions in which all of the locking elements could be moved. An essential advantage of the invention is seen in the fact that the necessary changes in existing rotary locking cylinders are comparatively small. A considerably higher security against the unlocking method mentioned can be achieved at comparatively low costs. According to the development of the invention, manufacture is particularly cost-effective if the locking element is implemented by a pin which is mounted in a bore in the rotor. A plurality of such blocking elements are preferably provided. Each locking element is then assigned to a core pin of a tumbler row. The locking element can, however, be a slide that works together with several tumblers. The locking element or the locking elements can be held in the rest position by their own weight or by spring force.

Further advantageous features result from the dependent patent claims, the following description and the drawing.

Two exemplary embodiments of the invention are explained in more detail below with reference to the drawing. Show it:

1 shows a section through part of a rotary lock cylinder according to the invention,

2 shows a section according to FIG. 1, but with the key inserted and the rotor in the twisted and unlocked state,

3 and 4 schematically the cooperation between

Locking element and core pin, 5 shows a section through a tumbler according to a development of the invention, and

6 shows a section through part of a rotary lock cylinder according to the invention in accordance with the aforementioned development.

FIGS. 1 and 2 show a rotary lock cylinder 1 which has a stator 2 with a cylinder bag 17, which is only indicated here, and in which a rotor 3 is mounted in a longitudinal bore 24. Pin tumblers 8, each with a housing pin 9 and a core pin 10, are mounted in the longitudinal channels 5 of the stator 2 and in radial stepped bores 14 of the rotor 3. In each channel 5, a slide 4 is inserted, which receives the housing pins 9 of a tumbler row and in which springs 25, not shown here, are mounted, which hold the tumbler pins 9 and 10 in the position shown in FIG. 1, in which the core pins 10 each coexist a shoulder 11 abut a shoulder 26 of a stepped bore 14. In this position, the rotor is locked as shown by the housing pins 9 which exceed the shear line 7.

With a flat key 15 inserted into the key channel 6, the tumblers 8 can be arranged in a manner known per se and the rotor 3 rotated. The key 15 here is preferably a flat key with control bores 16. The core pins 10 are of different lengths and accordingly, the control bores 16 are of different depths.

Transversely to each stepped bore 14, a stepped bore 18 is machined into the rotor 3 from below, which opens into the stepped bore 14 at the top. The stepped bore 14 could also be machined into the rotor 3 from above and held in the rest position by means of a compression spring. At the bottom, the step bore 18 is open to a recess 20 of the stator. A blocking element 22, which has a head 22a and an upwardly projecting pin 22b, is inserted from below into each stepped bore 18. The head 22a engages in the recess 20 and lies with a surface 21 (FIG. 2) which runs obliquely to the shear line 17 against a parallel control surface 19 of the recess 20.

The locking elements 22 are held in the rotor position according to FIG. 1 by their own weight in the position shown. However, an embodiment is also conceivable in which the locking elements 22 are held in the rest position by compression springs (not shown here). Compression springs are expedient if the blocking elements 22 are inserted from above into corresponding bores in the rotor.

The core pins 10 each have a circumferential groove 12 machined into the outside, which is arranged and designed such that, when the core pin 10 is arranged, it is positioned at the level of the associated stepped bore 18 is. The width of the groove 12 corresponds approximately to the width of the upper mouth 18a of the stepped bore 18.

The operation of the rotary lock cylinder 1 according to the invention is explained below.

In the rest position of the rotor 3 according to FIG. 1, it is locked against rotation by the housing pins 9. If all tumblers 8 are arranged with an associated key 15, when the rotor 3 is rotated, the locking elements 22 are lifted out of the recesses 20 by the control surfaces 19 on the surfaces 21, the pins 22b each engaging in the correspondingly positioned groove 12. However, if at least one core pin 10 is not arranged, the associated locking element 22 cannot be lifted out of the recess 19, since the pin 22b abuts on the outside behind the groove 12 on the outside 10b. In the above-mentioned unlocking method, in which only the housing pins 9 can be arranged, there is a high probability that there are always a few core pins 10 in non-arranged positions, so that in an attempt to turn the rotor 3, the locking elements 22 lock the rotor.

The locking elements 22 are each stored with some play in the stepped bores 18. When the rotor 3 is tensioned in accordance with the unlocking method mentioned above, the locking elements 22 are not in engagement with the core pins 10 and can not be classified accordingly with the help of the locking elements 22.

A locking element 22 is preferably assigned to each tumbler of a tumbler row, as FIGS. 3 and 4 show. FIG. 3 shows the position of the tumbler elements at a position of the rotor 3 according to FIG. 1. FIG. 4, on the other hand, shows the locking elements 22 at the position of the rotor 3 according to FIG. 2. The locking elements are raised as can be seen and each engage in a groove 12 a. An embodiment is conceivable in which the number of locking elements 22 is smaller than the number of tumblers 8. Finally, an embodiment is also conceivable in which some or all of the locking elements 22 are connected to one another.

The rotary lock cylinder 46 shown in FIG. 6 differs from the cylinder 1 explained above only in the configuration of at least one tumbler 38. This tumbler 38 has a conventional housing pin 9 and a core pin 45, which are to be classified as releasing the rotor 3. The core pin 45 consists of a tip 39 with a cylindrical projection 40, on which a hollow cylindrical part 42 is placed, in which a pin 44 with a flange 43 is mounted such that it can be displaced to a limited extent. A compression spring 41 inserted into the part 42, which is weaker than the compression spring 25, exerts a force acting on the pin 44 to the left in FIG. 6. When the rotary lock cylinder is used normally, the pin 45 remains in the recessed position shown in FIG. 6 and has no effect on the functioning of the rotary lock cylinder. However, if, in the event of an unauthorized attempt to open, the housing pin 9 is moved outwards without the core pin 38, the pin 44 is immediately moved radially outwards by the spring 41 and follows the housing pin 9, as indicated in FIG. 5. As a result of the corresponding counterforce, the core pin 38 is held in the position shown in FIG. In an attempt to bring the core pin 38 into the position in which the groove 12 is at the level of the locking element 22, the spring 41 counteracts and thus complicates the desired positioning of the core pin 38.

As already explained above, the rotor 3 can only be rotated as a result of the locking elements 22 if the corresponding core pins 45 are positioned for all locking elements 22 such that the groove 12 is in each case at the height of the assigned locking element 22. The corresponding classification is particularly difficult when several tumblers 38 cooperate with locking elements 22 and are provided with pins 44.

Claims

claims

1. Rotary lock cylinder for a security lock, with a stator (2) and a rotor (3) and several tumblers (8) each having a core pin (10) and a housing pin (9), characterized in that in the rotor ( 3) at least one locking element (22) is mounted, which can be displaced approximately transversely to a core pin (10) of a tumbler (8) and, in its rest position, engages in a recess (20) in the stator (2) such that the recess ( 20) of the stator (2) has a control surface (19) such that when the unlocked rotor (3) is rotated, the locking element (22) is moved against the core pin (10) in such a way that its circumference ( 10b) a recess (12) is incorporated in such a way that when the core pin (10) is in place, after turning the rotor (3) by a comparatively small angle, the locking element (22) can be inserted into the recess (12) that it is lifted out of said recess (12) of the stator (2) and that if the core pin (10) is not arranged, the locking element (22) is essentially not displaceable from the rest position and is present on the outside (10b) of the core pin (10).

2. Rotary lock cylinder according to claim 1, characterized in that the recess on the circumference (10b) of the core pin (10) is a circumferential groove.

3. Rotary lock cylinder according to claim 1 or 2, characterized in that the control element (22) is inserted into a recess (18) worked into the underside or top of the rotor (3).

4. Rotary lock cylinder according to one of claims 1 to 3, characterized in that the locking element (22) has a pin which is mounted in a bore (18) of the rotor (3).

5. Rotary lock cylinder according to one of claims 1 to 4, characterized in that several locking devices (8) are each assigned a locking element (22).

6. Rotary lock cylinder according to one of claims 1 to 5, characterized in that the locking element (22) or the locking elements have a head (22a) which engage in the recess (20) of the stator (2).

7. Rotary lock cylinder according to claim 6, characterized in that the head (22a) is held in the rest position by its own weight or by spring force in the recess (20).

8. Rotary lock cylinder according to one of claims 1 to 7, characterized in that at least one core pin (38) has a pin (44) which can be displaced to a limited extent and which has a housing pin (9) which moves away from the core pin (38). follows through the action of a spring (41).