| 摘要 |
The invention relates to a ldouble-action locking device which uses, as locking means, some profiled small pistons (3) resting on the helical springs (7) gliding through some longitudinal holes (s), the movable part of the locking device consisting of two rotating units (1 and 2) centred by means of a stift (5) mounted in the holes (e) and fastened by means of a screw (6), the stationary part of the locking device consisting of a fixed bushing (4) positioned between the two rotating units (1 and 2).
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