Abstract: A fastening device (F) with first (16) and second sides (30) attaches a first device (10) to a mounting rail (12) of a second device (14). A top section (44) for mounting the first device extends from the first or second sides. The sides are adapted to removably clamp about the rail. A clamping member (46) extends between the first and second sides. An extended end (48) of the clamping member extends through the first side, and an opposing end (50) is coupled with the second side. The clamping member extended portion (48) is movably coupled to a single cam member (56) operably mounted with the first side for drawing the sides closer together into a clamping position (58) to mate the sides with the rail.

Abstract: A flip-up helmet mount for a night vision goggle includes a plurality of nested relatively movable brackets, the first of which is secured to a user's helmet. A second bracket pivots relative to the first to provide flip-up motion for the night vision goggle, and a third of the nested brackets is pivotal on the second bracket to provide a tilt angle adjustment for the night vision viewer. In order to both save battery power, and to prevent the user from inadvertently revealing his position by forgetting to turn off the night vision viewer before flipping it up, the support structure includes a magnetic flux source cooperable with a magnetically-responsive switch of the night vision viewer to maintain the viewer turned on only when the viewer is in its use position.