GB468766A - Improvements in coupling devices for scaffolding tubes, rods or the like - Google Patents

Abstract

468,766. Pole scaffolding. REDMORE, J. Jan. 6, 1936, No. 8104. Divided application. [Class 20 (ii)] [Also in Group XIV] A coupling device for scaffold tubes, rods, and the like of the kind in which an undercut slot in one member engages over a headed projection or dovetail provided on the other member, has means such as a flange provided around the projection to take the bearing stress from the projection and locking means to prevent accidental disengagement of the members joined. The scaffold member B is provided with a collar A secured by a screw C or by welding or pinning and carrying dovetail or headed projections a<4> surrounded by bearing flanges a<6>. The members to be joined are provided with corresponding dovetail or under-cut end recesses d<1> to engage over the projections a<4>, and a rectangular plate e placed on the tube B above the collar is rotated to bring its corners over the joints and prevent disengagement. The slots are provided in plugs d screwed into the ends of the members D so that the positions of the plugs may be adjusted. In a modification, Fig. 6, the locking plate is omitted and the slots d<6> pass only halfway across the ends of the plugs, the tubes D being rotated after engagement with the tube B so as to bring the open ends of the slots against the lower faces of the bearing flanges. In a further modification, Fig. 10, the dovetail projections a<7> are rotatably mounted on the collar and after engagement of the tubes D these and the projections are rotated to bring the enlarged parts of the dovetail slots against the bearing flanges. The undercut recesses may be provided in the ends of the members themselves and the sleeve A may be formed in two hinged portions provided with a clamping screw.