Tamper resistant closure

A tamper resistant closure system, which comprises:

• a container having a hollow neck with a mouth at an upper end of the neck, the mouth defining an opening for filing and emptying the container;
• a plurality of teeth spaced around the periphery of the neck, and extending radially therefrom such that the circumferential distance between said teeth is greater than the width of said teeth;
• a thread on the mouth for engaging and capturing a mating thread on a cap;
• a cap having a disc-shaped top portion and an annular skirt depending therefrom, said annular skirt including along an inside wall a thread for mating with the thread on said neck;
• a sleeve of shrinkable plastic, said sleeve including at least one longitudinal line of relative mechanical weakness, said sleeve tightly shrunk around said cap and said neck to cover said annular skirt and said plurality of teeth, said line of relative weakness positioned such that when twisting forces are applied to the sleeve and the cap in an opening direction past at least one of the plurality of teeth, the tooth will tear the sleeve proximate to said line of relative weakness to provide evidence of tampering.

A container for tamper resistant closure system, which comprises:

• a hollow body for containing a substance;
• a hollow neck extending upwardly from the body, the neck having at one end a generally cylindrical mouth defining a circular opening for introducing or emptying the substance to the hollow body of the container;
• the neck including at least two pairs of teeth placed on opposite sides of the neck adjacent the mouth, each tooth having a substantially right triangular shape with the longest side of the triangle extending between a first point on the neck and a leg which extends substantially perpendicularly from the neck at a second point on the neck below said first point, said teeth for engaging a sleeve of shrinkable plastic having a pair of closely spaced, substantially parallel lines of longitudinal perforations and for severing said sleeve along at least one of said lines of longitudinal perforations when said sleeve is twisted;
• said teeth having a width which is less than the circumferential distance between said at least two pairs of teeth.

A tamper resistant closure system, comprising:

• a container having a hollow body, a hollow neck upwardly extending therefrom, the neck having a generally cylindrical mouth at an upper end thereof defining a substantially circular opening to introduce or remove a substance from the container;
• a thread on the mouth for capturing a mating thread on a cap in closing relation;
• a first pair of teeth positioned on the neck below the mouth on one side of the container, each tooth having a substantially right triangular shape with the longest side of the triangle extending between a first point on the neck and a leg which extends substantially perpendicularly from the neck at a second point on the neck below said first point;
• a second pair of teeth positioned on the neck below the mouth on the opposite side of the container from said first pair of teeth, each tooth having a substantially right triangular shape with the longest side of the triangle extending between a second point on the opposite side of the neck and a leg which extends substantially perpendicular from the neck at a point below said second point;
• said teeth having a width which is less than the circumferential distance between said first and second pairs of teeth;
• a cap having a generally circular disc-shaped top portion and an annular shirt depending therefrom, said skirt including on an inner surface thereof a thread for mating with the thread on the mouth to capture the cap in sealing relation with the mouth;
• a sleeve of heat shrinkable thermoplastic material, said sleeve having a pair of closely spaced, substantially parallel lines of perforations extending from end to end along a longitudinal axis of said sleeve, said lines of perforations defining a tear-away portion to facilitate removal of said sleeve and having an opening tab between said two lines of perforations to facilitate removal of the sleeve;
• said sleeve tightly shrunk around the annular wall of the cap and the teeth on the neck of the container to grip said teeth and said annular wall, and positioned with the lines of perforations substantially adjacent said teeth such that when said cap and said sleeve are twisted in an opening direction, said lines of perforations move toward said teeth and said teeth tear said sleeve between at least two adjacent perforations in one of said lines to provide evidence of tampering.