| 摘要 |
The system has a pin (50) mounted in translation in a housing (41) against an elastic force, where the pin takes any position in the housing between an entering position and a stable existing position. The entering and existing positions are defined such that an end (52) of the pin is turned towards an inner wall (31) of a cylindrical hollow tube i.e. lantern tube (20), emerged out from the housing and penetrated into a groove (30) under action of the elastic force when the pin arrives opposite to the groove until knocking the pin against a portion of an annular surface (35). |
