| 摘要 |
A safety fastener for joining two laminae, comprising a male element having two pieces fixed together for holding one of the laminae therebetween and a female element releasably connectible to the male element. The female element is formed as an inverted cup with its base arched and susceptible to pass from concave to convex and provided with projecting teeth adapted to engage an annular slot in the male element. The female element is confined with free-play between an exterior tubular piece and an intermediate tubular piece. A concave disc is supported adjacent the base of the female element, whereby the fastener is opened by finger pressure exercised on the convexity of the female element. A ring is provided for fixing the female element to the other laminae. |
