Patent ID: 6719509
Filing Date: 2004-04-13
Classification: F16B

Abstract:
An expansion screw, comprising:(a) a bolt with a threaded distal end; (b) a nut having a substantially cylindrical shape and defining a threaded central bore adapted to receive said threaded distal end of said bolt; and, (c) a nail tube having an annular ring formed at a distal end and fastenable to said nut; a proximal end with a substantially cylindrical central channel adapted to slidingly receive said bolt; a middle portion interposed between said proximal and distal ends and having an at least one expansion section each with a plurality of carved longitudinal slots formed therein and regularly spaced each from the other in a circumferential manner, said carved longitudinal slots defining between adjacent carved longitudinal slots a plurality of radially deformable slot sections; and, at least a pair of inverted U-shaped slots formed proximal to said annular ring and regularly spaced from each other, with each inverted U-shaped slot defining an expansion flap that is radially displaceable and located on an inner side thereof, wherein said bolt is threadedly engaged and axially displaced in said nail tube.