| 摘要 |
1. Rigid removable assembling device for fitting an auxiliary block (22) onto a moulded box (10) made of elements (12, 14) held together by means of tubular rivets (16), namely the moulded box of a miniature circuit breaker, comprising : - a metal screw (24) with cylindrical body, whose head rests against said auxiliary block (22), - an internally threaded nut (36) with a radially deformable notched end (40), - a not-threaded bushing (38) placed between nut (36) and head (34) of said screw (24), having one end (46) intended to contribute with said notched end (40) of said nut to block said nut (36) through radial expansion of notched end (40) inside rivet (16) ; - the expansible bushing-nut unit (36, 38) being intended to be inserted into the end of tubular rivet (16) and take up the threaded cylindrical part of said screw (24), characterized by the fact that : - said first end (46) of bushing (38) is wedge-shaped, and that - the other end of bushing (38) has a rotation lock pin (44) intended for penetrating into a hole (30) of appropriate form.
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