Abstract: A screw (1) is provided with a shank (3), a head (2) and a boring part (5). The shank (3) is provided with a thread (4). The head (2) has a shoulder (6) disposed at an axial distance (B) from the bearing face (12), while a portion (7) adjoining the shoulder on the shank side is provided with a tool drive (8). The head (2) of the screw can therefore be seized in axially secure manner by a tool in the region of the shoulder (6), and this tool can then simultaneously transmit the necessary torque in the region of the tool drive (8) as well.

Abstract: In a screwing element (1) for accommodation of a fastener head (5) of a fastener (6) there are provided jaws (3, 4) for seizing the fastener head. The jaws (3, 4) can be axially inserted into or withdrawn from the holder (2), wherein the jaws in the withdrawn position can be pivotably forced apart into open position. At their free end the jaws are provided with incisions (15, 16) and, adjoining these, with gripper-like parts (17, 18) jutting outwardly toward the central axis for the purpose of engaging mechanically and/or frictionally with the fastener head (5) from behind.

Abstract: The invention relates to a method for determining the vertical distance between an object and a device with a changing position, especially a motor vehicle, whereby a first sensor placed in this device gives off a signal, said signal is reflected by the object, and the reflected signal is received by the first sensor. The distance between the first sensor and the object is calculated from the transit time of the signal from being sent to being received by the first sensor. This distance is used to calculate all possible positions of the object in relation to the sensor, in order to determine the vertical distance of the object. The signal reflected by the object is also received by a second sensor, this second sensor also being positioned in the device with a variable position. A path from the first sensor to the object and from the object to the second sensor is then calculated from the transit time of the signal from the first sensor to the second sensor.

Abstract: In a screwing element (1) for accommodation of a fastener head (5) of a fastener (6) there are provided jaws (3, 4) for seizing the fastener head. The jaws (3, 4) can be axially inserted into or withdrawn from the holder (2), wherein the jaws in the withdrawn position can be pivotably forced apart into open position. At their free end the jaws are provided with incisions (15, 16) and, adjoining these, with gripper-like parts (17, 18) jutting outwardly toward the central axis for the purpose of engaging mechanically and/or frictionally with the fastener head (5) from behind.

Abstract: In a screwing element (1) for accommodation of a fastener head (5) of a fastener (6) there are provided jaws (3, 4) for seizing the fastener head. The jaws (3, 4) can be axially inserted into or withdrawn from the holder (2), wherein the jaws in the withdrawn position can be pivotably forced apart into open position. At their free end the jaws are provided with incisions (15, 16) and, adjoining these, with gripper-like parts (17, 18) jutting outwardly toward the central axis for the purpose of engaging mechanically and/or frictionally with the fastener head (5) from behind.