| 摘要 |
<p>An eye-guard for a night-sight augmented by an image intensifier requires some form of removable shutter to be employed to block the light emanating therefrom until the sight is actually to be used. The present invention proposes an eye-guard that is in essence constructed from two open-ended tubes coaxially mounted for relative axial sliding movement one within the other against a restoring force, the larger diameter, outer, tube bearing hingedly mounted therein two opposing opaque flaps extending across and "closing" this tube, the arrangement being such that as the two tubes are caused to slide relative one to the other so the smaller diameter, inner, tube pushes the flaps out of the way, and thereby "opens" the tube and thus the sight.</p> |
