| 摘要 |
The invention relates to a screw with a screw head having a drive, and a corresponding drive tool, and a drive system having the screw and the drive tool. The screw embodies a screw head having a drive; the drive includes cams formed by recesses introduced in the screw head around the cams. Each cam has two side faces which are used to transmit torque, and an end face connecting the side faces. The end face has a concave surface contour on the end of the screw head facing away from the screw shank. The end face has a virtual circular periphery around the screw axis in a plane perpendicular thereto and having a radius associated with the plane has a point of contact on the cam with the end face. Over at least one portion of the axial height of the end face, a plurality of points of contact form a contact line in the centre of the end face. The drive tool incorporates a basic body having integral entraining elements in a radial extension to the outside. The basic body in which the tip for driving the screw is introduced, forms a conical portion which tapers toward the tip. |
| 主权项 |
1. A screw with a screw head having a drive, wherein the drive comprises:
cams formed by recesses introduced in the screw head around the cams, wherein each cam has two side faces which are used to transmit torque, and an end face connecting the side faces, said end face having a concave surface contour on the end of the screw head facing away from the screw shank characterized in that the end face is designed such that a virtual circular periphery around the screw axis in a plane perpendicular to the screw axis and having a radius associated with the plane has a point of contact on the cam with the end face, wherein—over at least one portion of the axial height of the end face—the contact region—a plurality of such points of contact are formed, said points of contact forming a contact line in the centre of the end face. |
