Device for adjustable fixing of an element to a fixed element

Claim 1

Screw device for adjustable interconnecting two elements comprising: a. an elongated screw member having a screw threaded portion at one end to be screwed into one of said elements and a polygonal bolt head portion adapted to be engaged by a wrench tool at the other end; b. a collar defining the end of the screw threaded portion; c. a cylindrical portion betWeen said collar and the bolt head; d. an externally screw threaded tubular nut member to be screwed into the other one of said elements having a portion rotatably supported on said cylindrical portion and abutting said collar and a portion having an enlarged diameter relative to the screw threaded portion of said screw member surrounding said bolt head portion; e. means for maintaining said tubular nut member against axial displacement on said cylindrical portion while permitting rotative movement thereon; f. the portion of said tubular nut member surrounding said bolt head portion having an enlarged polygonal socket adapted for internal engagement by a wrench tool and to accommodate said bolt head portion in relatively spaced relationship to provide a space permitting access for a wrench tool for selective engagement with either or both of said bolt head portion and said socket; g. the screw threads of said screw member and the screw threads of said nut member having the same pitch.