Device for the assembling of a plurality of converging tubular bars

Claim 1

In a device for the uncoupling connection of a plurality of convergent tubes by means of a star-shaped central core with branches which fit into ends of the tubes, each of the branches having means for clamping by expansion in said tubes, the ends of the tubes being shaped to fit against each other in such manner as to completely cover the central core, access being however provided to act on the clamping means of each branch, the improvement comprising in combination two means for locking said tubes around all possible axes of oscillation, whatever the intensity of the clamping, comprising said means for clamping by expansion comprising two parts comprising a first part constituting said branches being and integral one-piece part of the central core and the other part being a separate movable part for each branch juxtaposed with said first part, and screw clamping means for moving said two parts apart from each other, each of said two parts having two exterior lateral oblique bearing surfaces together forming four cornermost regions thereof, said ends of the tubes having four interior lateral oblique bearing surfaces forming four interior cornermost regions thereof complementary to and together forming inclined corners cooperating with said oblique bearing surfaces of said two parts with lateral pressure in four different directions substantially perpendicular to the oblique bearing surfaces and diagonally to the cross-section of the tubes when said screw clamping means is actuated to move said two parts apart, and said two parts having aligned free ends formed with cooperating corresponding inclined planes constituting means for moving said two parts away from each other if said movable part begins to displace longitudinally in a direction of removal of the tubes during commencement of uncoupling, said inclined planes are inclined in a direction toward said first part.