Spacer for concrete shuttering has threaded tension rod with quick nut held in cage moving between end stops

摘要

The spacer has a tension rod with a threaded end and a nut (5) with a quick thread. A cage (10) encloses the screw and is locked for rotation but free in translation between front and rear stops. The cage has at least two generatrices (11A), on its rear part turned towards the actuating head of the rod, which are angled to the longitudinal axis of the rod to form an open V. The V is open towards the head which co-operates with the two rear faces of the nut to open it when it is pushed towards the generatrices. The cage is retained on the dorsal part of the shuttering flange.