Patent ID: 7878746
Filing Date: 2011-02-01
Classification: B21K,B23P,F16B

Abstract:
1. A hollow functional element ( 10 ) having a longitudinal axis ( 14 ), a body section ( 16 ), a hollow piercing section ( 18 ), an annular contact surface ( 20 ) on the body section, which extends substantially perpendicular to the longitudinal axis ( 14 ) and radially away from the piercing section ( 18 ) and an axially extending ring groove ( 21 ) which is provided in the body section radially inside the contact surface ( 20 ), with the functional element ( 10 ) being designed for attachment to a component ( 22 ) which is of planar shape at least in the region of the attachment to the functional element, wherein the body section ( 16 ) has a pressing surface ( 24 ) at the side remote from the piercing section and wherein ribs ( 26 ) providing security against rotation are provided which cross the ring groove ( 21 ) at least in part and wherein the hollow piercing section has a free end face provided with a circular cutting edge ( 30 ) having an edge diameter, wherein a peripheral bead ( 32 ) having an apex with an apex diameter is provided at the piercing section ( 18 ) between the annular contact surface ( 20 ) and the free end face ( 28 ) of the piercing section ( 18 ), wherein a ring recess ( 34 ) is provided around the piercing section axially between the peripheral bead ( 32 ) and the free end face ( 28 ) of the piercing section and wherein said edge diameter is of the same size as said apex diameter.