| 摘要 |
<p>* A junction piece for releasably connecting rod-shaped structural elements is disclosed, comprising a junction ball and pin elements radiating from the ball and insertable and fixable in recesses in the ends of the rodshaped structural elements. The pin elements are cylindrical bolts which have an annular circumferential groove which has an inclined wall remote from the ball adapted to be engaged by an end of a radial fastening screw extending through the wall of a said recess. Preferably each of the pin elements has, at one end, a screw-threaded projection screwable into a threaded socket in the ball.</p> |
