Wood screws, cross holes and safety driver for minus hole such as concrete screws

摘要

(57) [summary] (modified with) [purpose] a long screw floor, the axial direction of the screw when it is screwed to the concrete to provide a threaded possible driver without blurred. [Configuration] The driver rod 8 having a negative shape mold part 2 a cross-type section 1 and the other end portion at one end by bolts 5 in the connecting portion the metal tube 4 of the handle 3 is fixed to the handle 3, the driver rod 8 pressure on the driver rod 8 at the tip and the handle 3 is supported by three points at Tamajo of bis driver rod 8 was inserted into the mounting screws support angle barrel 15 opposite the screw support angle barrel 15 two bullets conditions inserted into the The structure of the screw bed was so screwed into the concrete by turning while adding.