Lock cylinder for an ignition starter switch or a wheel lock at a vehicle with a cylinder core which is at least pivotably received in a cylinder housing. At least one blocking member prevents a rotation of the cylinder core in the cylinder housing in a blocking position and in a releasing position releases a rotation in the cylinder housing. A key channel extends through the cylinder core in which a key is insertable and with which the blocking member is movable between the blocking position and the releasing position. At least two rotation positions can be occupied. In the off-position a key is insertable and detractable in the key channel and in the starting position a vehicle starter can be switched on. A mechanical resetting block prevents a resetting of the cylinder core from the starting position to the off-position by a simple rotation of the cylinder core.

A keyed cylinder sleeve includes a body and an anti-rotation feature. The body extends between a first end and a second end along an axis. The body has a first face and second face disposed about the first end, an inner bore configured to receive a keyed cylinder, and a holding block extending from the second face towards the second end. The anti-rotation feature is connected to the body and is disposed adjacent to the holding and is disposed proximate the second end.

The invention relates to an antitheft device for a motor vehicle steering column, comprising: a locking means mounted in a movable manner between an unlocked position in which it is intended to be disposed away from the steering column and a locked position in which it is intended to prevent said steering column from moving, anda cam (12) intended to rotate as one with a lock plug (5) in order to actuate the locking means depending on the position of the lock plug (5), characterized in that the cam (12) comprises: a nonreturn profile (13) intended to engage with a complementary assembly member (15) that is configured to prevent the cam (12) from rotating in the opposite direction once it has reached a predetermined angular position, and a push-locking recess (14) intended to receive a stop (20, 21) that is intended to engage with a complementary assembly member (15) that is configured to prevent the cam (12) from rotating in a predetermined direction of rotation from a predefined angular position and to allow rotation of the cam (12) by the lock plug (5) being pushed in beforehand.

Lock cylinder (10) for at least an ignition starter switch (50) or a wheel lock (70) at a vehicle with a cylinder core (12) which is at least pivotably received in a cylinder housing (11) wherein in the cylinder core (12) at least one blocking element (13) is provided which prevents a rotation of the cylinder core (12) in the cylinder housing (11) in a blocking position and in a releasing position releases a rotation in the cylinder housing (11) and wherein a key channel (12.1) extents through the cylinder core (12) in which a key (14) is insertable and with which the blocking element (13) is movable between the blocking position and the releasing position and wherein by the cylinder core (12) at least two rotation positions (0, III) can be occupied, namely an off-position (0) and a starting position (III) wherein in the off-position (0) a key (14) is insertable and detractable in the key channel (12.1) and in the starting position (III) at least an appliance, particularly a starter of the vehicle can be switched on.

According to the invention, it is intended that a particularly mechanical resetting block (15) is existent which prevents a resetting of the cylinder core (12) at least from the starting position (III) in the off-position (0) by a particularly simple rotation of the cylinder core (12).

A keyed cylinder sleeve includes a body and an anti-rotation feature. The body extends between a first end and a second end along an axis. The body has a first face and second face disposed about the first end, an inner bore configured to receive a keyed cylinder, and a holding block extending from the second face towards the second end. The anti-rotation feature is connected to the body and is disposed adjacent to the holding and is disposed proximate the second end.