Patent ID: 7490864

Claim:
A joint device for a gas container having a body with a top and a bottom and a threaded hole defined on the top of the body, and the joint device having a joint comprising a bottom; a front side; a rear side opposite to the front side; an external surface; a threaded stub formed on the bottom of the joint and adapted to be screwed with the threaded hole in the body; a gas-inlet formed in the front side and having an internal surface; and an internal thread formed on the internal surface; a leakage proof element mounted on the gas-inlet and having a proximal end; a distal end; an external surface; a connecting portion formed on the proximal end of the leakage proof element and having an external surface; and an external thread formed on the external surface of the connecting portion and screwed with the internal thread in the gas-inlet; a head formed on the distal end of the leakage proof element and having a filling hole; and an outer annular groove formed on the external surface of the leakage proof element near the head; and a connecting device combined with the leakage proof element of the joint, being tubular and having a proximal end; a distal end; a head holder formed on the proximal end, being hollow and holding the head inside and having a front end faced to the head; a rear end of the head holder combined with a connecting tube; an internal surface; an external surface; a center; two pinholes formed in the external surface and opposite to each other near the rear end of the head holder; two through holes formed from the external surface to the internal surface and corresponding to the two pinholes; and an inserting member mounted at the center of the head holder and having an air passage extending through the inserting member; and a connecting tube formed on the distal end of the connecting device and having a front end; a rear end combined with the rear end of the head holder; an external surface; an outer thread formed on the external surface of the connecting tube near the front end; two grooves formed on the external surface between the front end and the rear end and corresponding to the pinholes; and two concavities formed on the external surface of the connecting tube near the front end; two pivotal pins inserted respectively into the pinholes; two buckling elements connected to the head holder by the pivotal pins and each buckling element having a tab having an action end set corresponding to one of the grooves of the connecting tube; and a pivot end connected to one of the pinholes of the head holder by one of the pivot pins; a connecting arm connected to the tab; and a pillar connected to the connecting arm and fitted into one of the through holes of the head holder and having a hooked end engaged with the outer annular groove of the leakage proof element; and two springs mounted respectively in the concavities on the connecting tube and contacted respectively with the tabs of the buckling elements.