ATTACHMENT MEMBER UNIT TO BE DRIVEN INTO HARD RECEIVING MATERIAL BY POWDER CHARGE OPERATED SETTING TOOL

摘要

Attachment member unit includes an axially extending shank with a load engagement part at its trailing end. The shank has a pointed tip at its leading end. A prestressing element laterally encloses the pointed tip. The prestressing element is formed of a sleeve part and a bearing part. The bearing part forms the leading end of the prestressing element and the sleeve part forms its trailing end. A recess extends into the bearing part from the leading end. The recess has a diameter such that the trailing end portion of the prestressing element under deforming forces can telescope into the bearing part. When the attachment member unit is driven, the prestressing element causes a prestress against a connector member and due to the telescoping action and also a dampening action, the connector member can be fastened to a receiving material by the shank, and the connecting member is not damaged.