Closure for liquid container

Claim 1

A closure for a liquid container which comprises a hollow spout member including a lower portion mounted on and in communication with the interior of the container, an intermediate tubular portion, and an upper externally threaded portion, radially outwardly extending rib means on the lower portion, a cap member including an upper portion threaded on the upper portion of the spout member, downwarDly extending resilient strap portions, and an annular stop portion supported on the strap portions, and radially inwardly directed rib means on the stop portion, the rib means on the stop portion including a plurality of first rib members, each of said first rib members including a downwardly and outwardly sloping bevel face at a lower end thereof, the rib means on the lower portion of the spout member including a plurality of second rib members, each of said second rib members including a downwardly and outwardly sloping bevel face at an upper end thereof, the bevel faces being engageable to cause centering of the stop portion of the cap member on the lower portion of the spout member, the strap portions normally urging the stop portion to a position where the rib means are arranged to engage and lock the cap member on the spout member, the stop portion being displaceable from normal position for freeing the rib means.