Patent ID: 8434980

Claim:
An expansible anchor assembly comprising: an expansion sleeve including a first end, a second end, an expansible member disposed adjacent to said second end, and a bore defined inside said expansion sleeve for communicating said first end with said second end and allowing said anchor bolt to extend therethrough, said expansible member having a plurality of slits axially extending from said second end, on which a plurality of expansible segments are divided by said slits, an inner wall of said expansion sleeve including a threaded portion in the proximity of said first end, a propelling leg disposed in the proximity of said second end, and a supporting portion disposed between said threaded portion and said propelling leg, said propelling leg being in a conical extension tapered from said supporting portion toward said second end; and an anchor bolt plugging said expansion sleeve for expanding said expansion sleeve, wherein, said anchor bolt comprising a plug body for extending through said supporting portion and an insert extending outwardly from said plug body for being in radial abutment against said propelling leg; wherein, a groove is annularly formed at a periphery of said expansion sleeve for concentrically communicating with the expansible member, a distance measured from said groove to said second end being equal to ¼˜⅖ times a length of said expansion sleeve.