Abstract: A tagging device comprises a strap attached to a housing. A latch plate is mounted on a first length of strap and a collar is slidably mounted on a second length of strap. The latch plate has two location pegs which fit into holes on the first length of strap such that a hole fits over the lug to make the strap the correct size for a user. Two flexible barbs are formed on the collar such that the collar slides over the plate and the barbs are deformed as they slide up slopes on the plate. As the barbs slide off the end of the slopes they return to their rest position and snap into slots. Moving the collar in relation to the plate once the barbs have snapped into place in the slots causes the barbs to break, giving an indication of tampering.

Abstract: A helmet with twin visors movable between raised and lowered positions has a locking mechanism for each visor which automatically locks the visor in the raised or lowered position. An operating lever for each visor can be operated with one hand by the wearer, a single movement of the lever first releasing the lockikng mechanism and then moving the visor from one to the other of its raised and lowered positions. Each locking mechanism may comprise a cam plate fixed to the helmet shell and two pawls carried by the visor arm and spring-biased to engage the cam to lock the visor in the raised or lowered position respectively. The operating lever engages the appropriate pawl to disengage it from the cam plate and rotate the visor arm, on movement of the lever in the appropriate direction. The lower position of each visor may be adjustable, for example to accommodate an oxygen mask fitted to the helmet. The mechanism may also be used on a helmet fitted with a single visor.

Abstract: A helmet comprises a headshell, visor and a harness within which the head of the user is engagable. An auxiliary electrically operated service is provided, such as a lamp or air supply, operated by a switch actuated as the helmet is engaged or disengaged from the user's head. When the service is an air supply, the switch operates a fan motor which draws air into the helmet through a filter.