| 摘要 |
<p>A lock containing half-way down its secret cylinder a rebound (5) which coincides with a pin (13), impeding the determination of the hole (8) of the passage by the noise produced by the friction. So that the pin (13) penetrates its corresponding hole (8) it is necessary that the cylinder (2) be pressed or pushed from its position of turning, at which point the grooves of the cylinder (2) become encased in the serrated plate (9) which will impede the rotation of the same thus preventing any noise possibly made by the pin (13) passing through the hole (8). </p> |
