| 摘要 |
An automatic lock slider for a slide fastener provided with discrete coupling elements includes a locking prong which is movable into and out of a guide passage in the slider. The prong has a cam surface downwardly canted at an angle of 20 DEG -30 DEG which represents the critical point at which the coupling elements would otherwise become displaced or dislodged when subjected to stresses tending to spread apart the fastener chain, and the cam surface initiates at a position above the upper end surface of the coupling element. This arrangement facilitates passage of the fastener chain underneath the locking prong without marring the coupling elements when external forces are exerted on the fastener chain. |
