Helmet mounting systems

A helmet mount for mounting an associated viewing device on a helmet, comprising:

• a first pivoting segment for attachment to the helmet;
• a second pivoting segment for attachment to the associated viewing device, the second pivoting segment pivotable relative to the first pivoting segment for selectively supporting the associated viewing device in a first, operational position before the eyes of a user donning the helmet and a second, stowed position above a line of sight of a viewer donning the helmet;
• said first pivoting segment including a vertical adjust mechanism, said vertical adjust mechanism including a base plate, a pair of locking rails attached to said base plate and defining a channel therebetween, a sliding plate slidably attached to said locking rails, and a clamping mechanism for selectively applying a clamping force to secure said sliding plate at a desired position relative to said base plate;
• and,
• said clamping mechanism including:
• a lever manually pivotable between a first, locked position and a second, unlocked position;
• a spring washer disposed between said lever and said sliding plate;
• a cam lock attached to said lever and extending through an opening in said sliding plate, said cam lock received within said channel;
• said locking rails cooperating with said base portion to define a pair of grooves formed in opposing walls of said channel;
• said cam lock having an elongate cam member wherein a long dimension of the cam lock extends parallel to said channel when the lever is in the unlocked position, whereby said cam lock does not extend into said grooves and is freely slidable;
• said locking rails having a chamfered surface for camming said cam member into said grooves against the urging of said spring washer to compress the spring washer and thereby provide a clamping force between the base plate and the sliding plate when the lever is rotated to the locked position.