| 摘要 |
The device has a tool (25) retained by a transversal pin (29) engaging with a notch (26) of the tool. A bore (27) has a collecting ring (30) for engaging with the pin. The ring is arranged in one position where the ring seals the bore and in another position where the bore allows fitting or return of the pin. A peripheral groove (28) of an impact demolition apparatus positions and guides the ring on the body of the apparatus. |
