EP0228549B1 - Cylinder lock with sliding core and bolt locking means - Google Patents

Description

The invention relates to a cylinder lock with a sliding cylinder core and bolt lock in the locking position, which is particularly, but not exclusively, intended for steering locks on motor vehicles.

In most known locks (cf. US-A 4099395) the bolt under the action of a return spring engages with a slot of the fixed part, but can be pushed back against the action of the spring by a thief who has successfully accessed the bolt is. Various solutions for locking the bolt in the locking position and for releasing it only after a certain rotation of the cylinder core have been proposed. These proposed solutions are generally complicated and cumbersome. The problem raised becomes even more complicated if the cylinder core is a sliding one.

The aim of the invention is to obtain a simple and economical locking means for the bolt in the locked position in a cylinder lock with a sliding cylinder core.

For this purpose, the lock according to the invention is characterized in that it comprises a hook which tilts against the action of a spring about an axis perpendicular to the axis of the cylinder core, namely between a first position in which the free end of the hook is adjacent to the free end the bolt or a tie rod is in fixed connection with said bolt when it is displaced, and a second position in which the free end of said hook escapes to said bolt, a shoulder of the cylinder core being supported on a projection of said hook , so that the hook is tilted in the sliding course of the cylinder core from the first to the second position.

The device according to the invention uses a simple and economical part with a return spring, which can be a simple, bent-over spring part which is welded to the part, thereby ensuring simple installation and safe operation.

Advantageously, the hook includes a nose in support of a shoulder of a cam which is coupled to the cylinder core after the key has been inserted, whereby the tilting axis of the hook is formed without its attachment with respect to a fixed part.

Tilting the hook due to the sliding of the cylinder core also enables security against turning the lock to be maintained.

• Fig. 1 die Schemaansicht eines Lenkschlosses im Axialschnitt nach einem Ausführungsbeispiel der Erfindung bei abgezogenem Schlüssel und gesperrtem Riegel ist;
• Fig. 2 entspricht der Figur 1, jedoch ist hier der Schlüssel eingeschoben, aber nicht gedreht worden;
• Fig. 3 entspricht der Figur 2, doch hat hier der Zylinderkern eine Drehung zum Rückzug des Riegels erfahren, und
• Fig. 4 entspricht der Figur 3, doch ist hier der Zylinderkern in die Verriegelungsstellung zurückgeführt worden, ohne den Schlüssel abzuziehen.

The invention will be better understood upon reading the following description with reference to the accompanying drawing, in which:

• Figure 1 is a schematic view of a steering lock in axial section according to an embodiment of the invention with the key removed and the bolt locked;
• Fig. 2 corresponds to Figure 1, but here the key has been inserted but not turned;
• Fig. 3 corresponds to Figure 2, but here the cylinder core has undergone a rotation to retract the bolt, and
• Fig. 4 corresponds to Figure 3, but here the cylinder core has been returned to the locking position without removing the key.

The lock comprises a cylinder housing 1, in which a cylinder core 2 rotates, which can slide axially against the action of a spring 2 when the pairs of pins 3-4 are shifted by a suitable key 5 such that their connection planes are in the jacket of the cylinder core 2 are (Figures 2, 3, 4). Without a suitable key (FIG. 1), the cylinder core is stuck with respect to the cylinder housing 1 against rotation and linear movement. The cylinder core 2 actuates a bolt 6 via a cam 7, which is coupled to the cylinder core 2 only after its rectilinear movement and acts on the neck of a tension rod 9 which is firmly connected to the bolt 6 in a rectilinear movement. A return spring 10 wants to bring the bolt 6 into the locking position, and a sensor group 11 of the key 5 holds the bolt 6 in the unlocking position as long as the key is in the key channel 12 of the cylinder core 2.

According to the invention, a hook 13 is installed, which can be rotated by a lug 14 in support against a circular shoulder 15 of the cam 7 and is subjected to the force of a spring 16, which is formed by a spring bed bent and welded to the hook 13. A projection 17 of the hook 13 lies in the path of a shoulder 18 of the cylinder core 2.

In the locking position (FIG. 1), the hook 13 is tilted such that its free end 13 ′ lies directly next to the free end of the tension rod 9, it being impossible for the bolt 6 to be pressed in against the action of its spring 10. Since the cam 7 is not coupled to the cylinder core 2, the bolt cannot be pulled back in the event of a violent rotation of the cylinder core by shearing off the pins 3-4. In addition, the cylinder core 2 comprises a tongue 19 (FIG. 2) which cooperates with a groove 20 in the cylinder housing, as a result of which a straight-line movement of the cylinder core is only possible in the rest position, so that a violent turning becomes even more difficult.

When the cylinder core 2 is pressed in, the shoulder 18 of the cylinder core 2 pushes back the projection 17 of the hook 13, which tilts and thereby compresses the spring 16, the end 13 ′ of the hook 13 detaching from the rear end of the tension rod 9 and releasing the bolt 6 .

When the cylinder core 2 is rotated, the cam 7 brings the bolt 6 into the retracted position, the cylinder core 2 in the advanced position by the interaction of a rear surface 21 is held with the adjacent wall 22 of the cylinder housing 1 as soon as the tongue 19 has left the groove 20 (FIG. 3).

If you want to go back to the angular position of the cylinder core 2 in accordance with the lock (FIG. 4), the cylinder core 2 slides under the action of its spring 2 ', the latch remains in the retracted position thanks to the sensor group 11 and the hook 13 tilts under the action of the spring 16 vice versa, but its free end 13 'comes to rest against the tension rod 9. Only after the key 5 has been removed, the bolt is released, and when it falls into a slot (not shown) in the steering shaft, the hook 13 ends its tilting movement, which is limited by the stop of its projection 17 against a support of the cylinder housing 1, and takes his position shown in Figure 1 to lock the bolt again.

Claims (4)

1. Cylinder lock with a sliding cylinder core and with facility for locking the bolt in the locked position, characterised in that it comprises a hook (13) which, against the action of a spring (16), tilts about an axis (14, 15) at right angles to the axis of the cylinder core (2) between a first position in which the free end (13') of the hook (13) is adjacent the free end of the bolt (6) or a draw bar (9) which is rigidly connected to the said bolt (6) upon rectilinear movement, and a second position in which the free end (13') of the said hook (13) moves aside in relation to the said bolt (6), a step (18) on the cylinder core (2) being so braced on a projection (17) on the said hook (13) that as the cylinder core (2) slides, the hook is tilted from the first position into the second position.

2. Lock according to Claim 1, characterised in that the hook (13) comprises a nose (14) braced on a step (15) on a projection (7) which is coupled with the cylinder core (2) after the key (5) has been inserted.

3. Lock according to one of Claims 1 and 2, characterised in that the cylinder core (2) and the cylinder housing (1), co-operate via a tongue (19) and a groove (20).

4. Lock according to one of Claims 1 and 2, characterised in that in any angular position other than when the key is inserted, the rear face (21) of the cylinder core (2) co-operates with an abutment (22) on the cylinder housing (1).

Images