Cap for a vessel

Claim 1

A closure for a vessel having an opening comprising, (a) a seal stopper at said opening, said seal stopper having a first outside surface portion, (b) a cap member covering said seal stopper at the outside surface, said cap member having an engagement portion in surface contact with said first outside surface portion, said engagement portion having a predetermined thickness, said cap member further having an integral projection extending away from the engagement portion, a thin plate portion extending from the engagement portion around the projection to join the projection to said engagement portion, said thin plate portion being of lesser thickness than the engagement portion to facilitate removal of said projection from said engagement portion of said thin plate portion upon deflection of said projection a predetermined amount with respect to said engagement portion, said engagement portion, in cross section, at the area of said thin plate portion declining toward said thin plate portion and said first outside surface portion and said thin plate portion being tapered and having a decreasing thickness in a direction from the engagement portion to the projection such that deflection and removal of the projection from the engagement portion at said thin plate portion exposes a declined and tapered edge portion, declined and tapered toward said first outside surface portion, said declined and tapered edge portion being in continuous contact against said first outside surface portion, to inhibit the declined and tapered edge portion from functioning as a cutting edge to cause injury.