Tamperproof screw cap

Claim 1

A combination spout, cap and locking means for a container comprising: a. an externally threaded spout; b. an internally threaded cap screwed onto the spout, said spout having a lower annular surface; c. a removable lock band surrounding the cap, including a shoulder on said lock band extending inwardly below the lower surface of said cap, said shoulder being engageable by said lower surface and lock means for preventing said cap from being removed from said spout as long as said lock band is in place, said lock means including a plurality of teeth projecting downwardly from said shoulder; d. stationary teeth positioned on said container adjacent said spout engageable with said teeth on said shoulder permitting said lock-band and cap to rotate in a direction to screw said cap onto said spout, but preventing said lock-band and said cap from moving in an opposite direction, thus preventing the unscrewing of said cap; e. means cooperating between said cap and said lock-band for preventing relative rotation between the two; and f. means to remove said lock-band from its position on said cap and thereby allowing said cap to be unscrewed from said spout.