US Patent 7318678 Self locking ergonomic support assembly for optical devices

A support assembly for supporting an optical recording device about an operator includes a shaft having a first distal end for mounting the optical recording device, and a second distal end for bearing against the back of the operator. A friction plate arm is slidably disposed on the shaft and pivotable movement of the friction plate selectively captures the operator between the friction plate and the second distal end, thus causing the friction plate to frictionally lock against said shaft.