Single-piece pre-shaped wall anchor

Claim 1

A one-piece, pre-shaped anchor bolt driven axially into an untapped round hole drilled in masonry to hold a fixture or other object having a mounting hole therein against the surface of the masonry, said mounting hole having a diameter substantially the same as that of the drilled hole; said bolt comprising a drivable head and a shank integral therewith formed of resilient material whose memory is such that when the shank is forcibly deformed it seeks to recover its original shape, said shank being pre-shaped to have at least one undulation which deviates from the longitudinal axis passing through the head and shank to create an arcuate bend therein having a peak which normally lies at a position well outside the periphery ofthe drilled hole and having an upper and a lower base, said shank having a cross section dimension which is substantially uniform throughout its length and is substantially equal to the diameter of the drilled hole to permit its undulation to snake through the mounting hole without the application of a driving force to the shank and to permit said shank to be driven axially into the drilled hole whereby when the shank is so driven this force acts to straighten out the bend to cause it to enter the drilled hole, the resultant deformation of the bend exerting substantial outward pressure against the wall of the drilled hole at a first level at which the peak contacts the wall of the drilled hole at one side thereof and at second and third levels at which the upper and lower bases contact the wall of the drilled hole on the other side thereof, which multi-level pressures exerted on the wall resist axial withdrawal of the shank from the drilled hole.