Screw cap

Abstract

A screw cap for containers with a threaded neck portion, comprising: a base portion comprising a top surface and a bottom surface, the bottom surface having a center, and an annular portion raised from the base portion. The annular portion has an inner surface and an outer surface. A threaded portion is arranged on the inner surface of the annular portion, the threaded portion having at least one thread, the thread extending from a start into a first circumferential direction around the inner surface, the start being that part of the thread, where the material of which the thread is made, starts to rise from the inner surface. An engagement portion is arranged on the bottom surface and projects from the bottom surface, the engagement portion having a reference line that runs along the bottom surface and crosses the center, whereby all material that makes up the engagement portion is arranged on one side of the reference line, the reference line touching at least one point of material that makes up the engagement portion, and whereby the angle between a plane that contains the center and the start and is orientated perpendicular to the bottom surface and the reference line is larger than 0° and smaller than 30°.

1 .- 9 . (canceled) 
     
     
         10 . A screw cap for containers with a threaded neck portion, comprising:
 a base portion comprising a top surface and a bottom surface, the bottom surface having a center;   an annular portion raised from the base portion, the annular portion having an inner surface and an outer surface;   a threaded portion arranged on the inner surface of the annular portion, the threaded portion having at least on thread, the at least one thread extending from a start into a first circumferential direction (A) around the inner surface, the start being that part of the thread, where the material of which the thread is made, starts to rise from the inner surface;   an engagement portion arranged on the bottom surface and projecting from the bottom surface, the engagement portion having a reference line (R) that runs along the bottom surface and crosses the center, wherein all material that makes up the engagement portion is arranged on one side of the reference line (R), the reference line (R) touching at least one point of material that makes up the engagement portion;   wherein the angle between a plane (P) that contains the center and the start and is oriented perpendicular to the bottom surface and the reference line (R) is larger than 0 degrees (0°) and smaller than 30°;   wherein the material that makes up the engagement portion is arranged on one side of the reference line (R) and the plane (P) that contains the center and the start and is oriented perpendicular to the bottom surface is arranged on the other side of the reference line (R) and the thread extends away from the plane (P) in a direction away from the reference line (R).   
     
     
         11 . The screw cap according to  claim 10 , wherein the angle between (a) the plane (P) that contains the center and the start and is orientated perpendicular to the bottom surface, and (b) the reference line (R), is larger than 2° and smaller than 26°. 
     
     
         12 . The screw cap according to  claim 10 , wherein the bottom surface is a circular surface, and wherein the center is the center of the circular surface. 
     
     
         13 . The screw cap according to  claim 10 , wherein three engagement portions are arranged on the bottom surface. 
     
     
         14 . The screw cap according to  claim 10 , wherein the at least one thread and the engagement portion are parts of an one piece element. 
     
     
         15 . The screw cap according to  claim 10 , wherein a recess is arranged next to the engagement portion. 
     
     
         16 . The screw cap according to  claim 10 , wherein the engagement portion is a rectangular block.