| 摘要 |
Linking elements (3), each comprising two locking grooves (3.11, 3.12) in its upper face are shaped and principal elements (2), carrying a lower groove (2, 10) are shaped. Two types of element are assembled so that two successive principal elements (2) have their locking grooves (2, 10) alternately opposite one (3.11) then the other (3.12) of the two grooves of the linking elements (3) so as to let the arched piece (handle) in position and to allow locking of the latch pieces (bolts) (4). <IMAGE>
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