Capscrew especially adapted to a ferrule pressure and screwing.

摘要

Screw whose head is specially designed to allow screwing / unscrewing of the screw by means of screw means comprising a portion one suitable for being driven in rotation and having at one end a coaxial cavity tubular bushing (10) it opens to the outside so that it can receive the head (1) of the screw, the inner surface of the sleeve (10) which delimits this cavity having at least one conformation for driving the screw head and on the other hand the gripping means of the mobile screws into the said cavity, the head (1) of the screw shaped so that it can be engaged in the said cavity, characterized in that the peripheral of the screw head edge is provided with recesses (6) intended to cooperate being in conformations that canota for exerting on the screw a coupling screwed in the screw portion comprises a low- cylindrical head (8) with the periphery (4) of the head (1) with the rod end (7) are calculated by the (R1, R2) radial backrests whose planes delimit a space which can engage means gripping the canota when said cavity, the beam of the cylindrical portion (8) equal to the distance between the bottom of the recesses (6) and the axis (X, x¿) being screw so as to obtain centering of the screw by the combined action of the sleeve (10) of the gripping means.