Patent ID: 6012358
Filing Date: 2000-01-11
Classification: B25B,Y10T

Abstract:
A tool for setting a self-cutting undercut anchor (6) where the undercut (U) is formed by an axially extending anchor rod (7) having a leading end to be inserted first into a borehole (B) in a receiving material (G) for receiving the anchor rod, a trailing end and a setting direction extending from the trailing end towards the leading end, the leading end of the anchor rod having a conically shaped surface (8) widening in the setting direction, and an axially extending rotatable sleeve (9) encircling the anchor rod and having a leading end and a trailing end and being insertable into the borehole (B), the leading end of said sleeve having axially extending cutting tabs (91) spreadable radially outwardly when said sleeve is rotated and axially displaced in the setting direction into contact with the conically shaped surface (8) and forming an undercut (U) in a laterally enclosing wall surface of the borehole (B), said tool comprising an axially extending rotatable propelling part (2, 12, 32) for said sleeve (9) of the undercut anchor (6), said propelling part having a leading end and a trailing end with an insertion end (3, 13, 33) at the trailing end thereof for insertion into a chuck of a rotary hammer drill for rotating and axially displacing said propelling part in the setting direction, an axially extending support element (4, 14, 34) arranged to interengage said propelling part and to be supported in the setting direction by a surface of the receiving material (G) into which the borehole (B) is formed, said support element (4, 14, 34) having a receptacle (5, 15, 35) for receiving and axially fixing the trailing end of said anchor rod, and said propelling part (2, 12, 32) being axially displaceable relative to said support element with said support element held against axial displacement by the surface of the receiving material as said propelling part is rotated and axially displaced, so that the sleeve of the undercut anchor is rotated and driven axially in the setting direction against the conically shaped surface (8) for rotating and axially displacing the cutting tabs on the sleeve for forming the undercut in the borehole.