Patent ID: 8251626

Claim:
An apparatus for securely attaching devices to a road surface comprising; a bolt comprising a tip member at a distal end, a compression transfer body member which interfaces with said tip at one end, a top member which interfaces with said body member at an opposite end from said tip member and, a tension member which connects said tip member to the top member, wherein said tip is equipped with one of more bolt depth detent mechanisms each comprised of a combination of a coaxial flexible tab and space sharing a particular axial level along the length of said bolt; a matching solid wall receiver with an internal closed bottom cavity having an opening at one distal end sized to receive said bolt and, plural receiver depth detent mechanisms each comprised of combination of a coaxial flexible tab and space complementary to those on said bolt tip member and located along the receiver cavity walls at more than one axial level so that the tab at one axial level is circumferentially offset with respect to the tab at an adjacent axial level so as to from staggered columns of tabs to act as a rotation restrictor for said one or more bolt depth detent mechanisms and; a means for securely attaching said solid wall receiver to an opening in a road sub-surface.