| 摘要 |
The safety device takes the form of a housing, of which at least a front face 4 (Figure 2) is movable between a position masking and a position unmasking the lock hole, this movable part 4 capable of being immobilised in the masking position, as desired, by means of a set of wheels 6a, 6b, 6d, 6c, of which a groove makes it possible, if it is brought into coincidence, for the movable part 4 to pass through and therefore for the lock hole to be unmasked. <IMAGE>
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