| 摘要 |
<p>The element to be protected hereby is an element consisting of a pull string (2), chain, wire or the like having at each end a coupling device (3) which may be coupled onto a coupling stud (6). The element is characterised in that the string (2), the chain, etc., is mounted so high on the coupling device (3) that a momentum influences the coupling device (3) that twists the coupling device (3) off the coupling stud (6) despite the frictional force therebetween when the element is pulled.</p> |
