Patent ID: 8550429

Claim:
A coupling assembly for a compressed air circuit comprising: (a) locking means for releasably engaging first and second sub-assemblies located at respective ends of first and second air lines, the first air line being connected to a tool adapted for compressed air operation, and the second air line being connected to a supply of compressed air, (b) valve means for controlling the flow of compressed air between the first and second air lines, the valve means being connected to the second sub-assembly and being slidably movable between a first position where it allows compressed air flow, and a second position where it prevents compressed air flow, such that when the locking means are engaged, the valve means can be positioned in either the first position or the second position, and (c) stop means for preventing disengagement of the first and second sub-assemblies when the valve means is in the first position, where said locking means includes pairs of first and second locking claws being twistable between locked and unlocked positions, and where said stop means includes a pair of stop arms which, when the valve means is in the first position, are slid between interlocking pairs of first and second locking claws so as to prevent the locking claws being twisted to their unlocked positions, and when the valve means is in the second position, are slid away from between interlocking pairs of first and second locking claws so as to allow twisting of the locking claws to their unlocked positions.