Patent ID: 7938606

Claim:
An attachment device, comprising a dowel sleeve ( 31 ) having an expansion region ( 32 ); and means for expanding the dowel sleeve ( 31 ) and having a shaft ( 12 ) with first ( 13 ) and second ends ( 17 ), rotation-transmitting means ( 15 ) provided at the first end ( 13 ), at least one first screw thread ( 19 ) extending from the second end ( 17 ), and at least one further multi-lead screw thread ( 23 ) provided in a thread region ( 21 ) of the at least one first thread ( 19 ) spaced from the second end ( 17 ), an axial extent of the thread region ( 21 ) with the at least one further multi-lead screw thread ( 23 ) being smaller than an axial extent (L) of the expansion region ( 32 ) of the dowel sleeve ( 31 ).