A method for anchoring an expansion anchor in a borehole is disclosed. The expansion anchor includes an anchor bolt and an expansion body on a first terminal section of the anchor bolt, an actuator disposed on a second terminal section of the anchor bolt, and an expansion sleeve disposed around the anchor bolt. In an embodiment, the method includes hammering the expansion anchor into the borehole in an insertion direction and actuating the actuator to screw the expansion body outwardly in a direction that is opposite the insertion direction such that the expansion sleeve is expanded radially outwardly and digs into a wall of the borehole and such that the expansion body digs into the wall of the borehole.

An anchor bolt (40) according to the present invention has a taper member (7) threadably engaged with the rod (4), and three or five abutment parts (12) fitted over the taper member (7). The taper member (7) has a cross section in a form of an equilateral triangle or pentagon, and three or five inclined surfaces (10) at respective sides of the triangle or pentagon. The inclined surfaces (10) are inclined closer to a central axis of the taper member (7) toward a base end of the anchor bolt (40). Each abutment part (12) has an inner surface (11) which is inclined closer to the central axis of the taper member (7) toward the base end and which abuts the inclined surface (10) of the taper member (7). In a state in which the taper member (7) and the abutment parts (12) are inserted into the attachment bore (2), when only the taper member (7) is moved toward an opening of the attachment bore (2), the outer peripheral surface (15) of the abutment parts (12) are pressed against the inner peripheral surface (2a) of the attachment bore (2) so that the abutment parts (12) are fixed in the attachment bore (2).

A multifunctional expansion bolt assembly includes a sleeve, a screw rod, and a connecting member. The sleeve includes a hollow body formed between first and second ends of the sleeve. The second end has at least one open groove. The screw rod includes a threaded portion. At least a portion of the threaded portion protrudes beyond the first end of the sleeve. A second end of the screw rod includes a conic portion having gradually increasing diameters towards the second end of the screw rod. The conic portion has a maximal diameter greater than an inner diameter of the second end of the sleeve. The screw rod includes at least one engaging portion having non-circular cross section and engaging with the at least one open groove. The connecting member includes an inner threading in threading connection with a portion of the threaded portion of the screw rod.

A fastener including a bolt having a head, a shank portion, and an annular groove located intermediate the head and the shank portion, and a sleeve having a head, a shank portion, an inner cavity, a recess located in the head of the sleeve, and an annular tab located at a bottom of the recess and proximate to the shank portion of the sleeve. The sleeve receives the bolt such that the shank portion of the bolt is positioned within the inner cavity of the sleeve and the head of the bolt is positioned within the recess of the head of the sleeve. When the bolt is in an installed positon within the sleeve, the annular tab of the sleeve is deformed and engages the annular groove of the bolt.

A fastener assembly with workpiece clamping functionality. The fastener assembly, in one example, includes a collet body with a cantilever leg that extends from a crown and includes a foot that mates with a sleeve opening in a collet body sleeve and the collet body sleeve at least partially circumferentially enclosing the collet body. The fastener assembly further includes a workpiece sleeve configured to, in an assembled configuration, mate with the collet body sleeve and prevent rotation of the collet body sleeve and a stud configured to theadingly engage the collet body sleeve or the collet body.

The utility model discloses an adjustable expansion anchor bolt, including a main sliding block set to be trapezoid-shaped and side sliding blocks respectively slidably installed on two sides of the main sliding block, c a side surface, farther away from the main sliding block, of the side sliding block is set as a vertical surface, a screw is arranged at a top center of the main sliding block, and a manual nut is installed on the screw. Beneficial effects of the utility model are as follows: The trapezoidal main sliding block and the two side sliding blocks that are slidably connected with the main sliding block are arranged, so that a user can reduce a distance between the manual nut and the main sliding block by tightening the manual nut during use.

An undercut anchor having an at least partially threaded rod portion having an outer thread diameter D.sub.ROD. The anchor having an expansion feature coupled to the rod portion and an expansion sleeve having an outer diameter D.sub.OUTER SLEEVE, an inner diameter D.sub.INNER SLEEVE and a wall thickness T.sub.SLEEVE. Furthermore, the expansion sleeve has a plurality of circumferentially distributed fingers which are configured to flex outwards when a ramp portion of length L.sub.RAMP of each of the respective fingers is forced against the expansion feature during installation of the undercut anchor. The fingers each having a length L.sub.FINGER and a distance therebetween of W.sub.SLOT.