Multi-fit cap

Abstract

A screw cap for sealing containers with threaded necks includes an outer body, having a cylindrical outer wall closed at one end by a circular lid and an interior neck seal adjacent to the circular lid. A female thread extends around an inner surface of the cylindrical outer wall. The female thread has a main portion having substantially uniform thickness, and an attachment portion having a thickness which is less than the thickness of the main portion. The female thread is attached to the inner surface of the cylindrical outer wall in the region of the attachment portion, and the attachment portion is configured to permit deflection of the female thread.

1 . A screw cap for sealing a container with a threaded neck, the screw cap comprising:
 an outer body, comprising:
 a cylindrical outer wall closed at one end by a circular lid, and 
 an interior neck seal adjacent to the circular lid; and 
   a female thread extending around an inner surface of the cylindrical outer wall, the female thread comprising:
 a main portion having substantially uniform thickness, and 
 an attachment portion having a thickness which is less than the thickness of the main portion; 
   
       wherein the female thread is attached to the inner surface of the cylindrical outer wall in the region of the attachment portion, and wherein the attachment portion is configured to permit deflection of the female thread. 
     
     
         2 . The screw cap according to  claim 1 , formed of a moulded polymer material. 
     
     
         3 . The screw cap according to  claim 2 , wherein the moulded polymer material is selected from one or more of the group consisting of: HDPE, LDPE, polyamide or polyacetal. 
     
     
         4 . The screw cap according to  claim 1 , wherein the thickness of the attachment portion is between 90% and 50%, between 80% and 60%, or more preferably between 75% and 67% of the thickness of the main portion. 
     
     
         5 . The screw cap according to  claim 1 , wherein the attachment portion has a length that is more than 5% and no more than 33%, more than 5% and no more than 20%, or between 10% and 15% of a total length of the female thread. 
     
     
         6 . The screw cap according to  claim 1 , wherein the main portion comprises an inclined region that extends from the attachment portion in a direction away from the lid of the outer body. 
     
     
         7 . The screw cap according to  claim 6 , wherein the inclined region extends from the attachment portion at an angle of between 10° and 65°, between 20° and 55° or between 30° and 45°. 
     
     
         8 . The screw cap according to  claim 7 , wherein the main portion further comprises an end portion which extends from the inclined region at an angle, such that the end portion is substantially parallel to the lid of the outer body. 
     
     
         9 . The screw cap according to  claim 8 , wherein the end portion has a length that is between 10% and 40%, or between 25% and 33% of the total length of the female thread.