Tube's cap and the pierce structure of a sealed opening

Claim 1

A dispensing cap for use on a tube of adhesive wherein said cap has a central hole for passage of adhesive, a piercing and cutting means in the form of a double knife depending from and substantially surrounding the inner end of said central hole, the inside surface of said cap being threaded to correspond with the threads provided on the exterior surface of the neck for said tube, a protecting ring maintaining said cap and associated piercing and cutting means in a spaced relationship with a sealed opening of said tube, and a protective cap for the outer end of said dispensing cap, said protecting ring being connected to said cap by frangible and non-frangible rods and being provided with a gap, said non-frangible rod having a thickness such that rotation of said cap to pierce and cut the sealed opening of said tube breaks said frangible rods and stretches said protecting ring forcing it away from the neck of said tube to a position where, by virtue of the non-frangible rod which connects said ring to said cap, it serves as a support to maintain said cap in an upwardly inclined attitude to avoid spillage of adhesive.