Container with removal resistant closure

A removal resistant closure and container assembly comprising:

• a container having a neck defining an opening;
• a closure for being applied to said container to occlude said opening, said closure having an open end for being disposed adjacent said container neck;
• a first thread defined by said container and extending at least partially around said opening from a leading end to a trailing end;
• a second thread defined by said closure and extending at least partially around said closure from a leading end to a trailing end;
• a third thread defined by said container and extending at least partially around said opening from a leading end to a trailing end;
• a fourth thread defined by said closure and extending at least partially around said closure from a leading end to a trailing end;
• each said thread defining a helical portion between said leading end and trailing end;
• said trailing end of each said thread on said container being located axially further away from said container opening than said leading end of each said thread on said container;
• said trailing end of each said thread on said closure being located axially further away from said closure open end than said leading end of each said thread on said closure;
• each said thread trailing end having a smaller angle than the helix angle of said helical portion;
• said third thread trailing end converging with said first thread helical portion to define a space between them which is less than the width of said closure second thread;
• said first thread trailing end converging with said third thread helical portion to define a space between them which is less than the width of said closure fourth thread;
• said fourth thread trailing end converging with said second thread helical portion to define a space between them which is less than the width of said container first thread;
• said second thread trailing end converging with said fourth thread helical portion to define a space between them which is less than the width of said container third thread;
• and
• said threads being resilient to accommodate deformation during relative rotational movement of said container and closure when said closure and container are screwed together whereby said threads are relatively axially displaced from a threadingly engaged condition to a fully closed disengaged condition which resists re-engagement.