| 摘要 |
<p>The threaded pin (13) is fixed axially in relation '. to the housing (6), but can rotate freely. The object to be protected is screwed on to the pin by means of a tapped hole. The part of the projecting pin which is free between the object and the aperture (7) in the housing is surrounded and hidden by a freely rotatable ring (15). The housing has a small insertion hole (17) through which a tool can be introduced to lock the pin against rotation whilst an object is screwed on to it or unscrewed from it. This hole is normally hidden by a lockable cover plate displaceable relatively to the housing.</p> |
