| 摘要 |
A shoe adapted for axial insertion into an end portion of an axially slotted tubular element (10), comprises a rib member (30-1) adapted to fit in the slot (10-1), having a height greater than the wall thickness of the tubular element and a length smaller than the length of the tubular element; and two transversal members (30-2, 30-3) attached respectively to the head and the foot of the rib member, each having a width greater than the width of the slot. |
