| 摘要 |
According to the invention, the wedging means of each of the tenons 5a, other than the articulated one, are constituted by two radial spaced ribs 12a-12b connected by an upper sheet 11 and able to be brought towards each other elastically, each of these ribs having an outer face composed of a lower wedging face 13 which is slightly pointed and an upper guidance and positioning face 14 having a greater slope and extending over a height H which is greater than that h, while the complementary means, formed in each of the inner side faces of each of the lugs 7a comprise a wedging face 15 and a guidance and positioning face 16 having slopes with the same values as those of the faces 13 and 14 of the ribs with which they cooperate. <IMAGE>
|
