Structural node of tight separable joint of bottle neck with its threaded screwed cap

Abstract

The structural node of tight separable joint of bottle neck with its threaded screwed cap made of plastic includes a cylindrical neck ( 1 ) of bottle ( 2 ) and a screw cap ( 3 ) screwed onto outer thread ( 4 ) of the neck, the cap being provided with an inner thread ( 5 ) and an inner sleeve ( 8 ) joined inseparably with bottom ( 6 ) of the cap, whereas outer surface of the sleeve has at least one annular sealing tongue ( 11 or 13 ) end of which fits tight to cylindrical surface ( 12 ) of the neck ( 1 ) or end of the at least one annular tongue ( 11 or 13 ) is set tightly in eat least one circumferential groove ( 14 or 15 ) provided on inner cylindrical surface ( 12 ) of the neck ( 1 ). Moreover the cap ( 3 ), on inner surface of its sleeve portion ( 10 ), has annular offsets ( 17 ) situated above its thread ( 5 ) ends of which are tightly set in circumferential grooves ( 18 ) provided on outer surface of the neck ( 1 ) above its outer thread ( 4 ) and opposite said offset ends.

1 . A structural node of tight separable joint of a threaded neck of a bottle with a threaded screwed cap made of a plastic comprising:
 a neck ( 1 ) of bottle ( 2 ) and a cap ( 3 ) screwed onto an outer thread ( 4 ) of said neck, said cap being provided with an inner thread ( 5 ) and with an inner sleeve ( 8 ) joined inseparably with a bottom ( 6 ) of the cap, whereas an outer surface of the sleeve is provided with at least one annular sealing tongue end ( 11  or  13 ) of which fits tight to a cylindrical surface ( 12 ) of the neck ( 1 ) or ends of the at least one annular tongues ends ( 11  or  13 ) are set tightly in at least one circumferential grooves ( 14  or  15 ) provided on an inner side of the cylindrical surface ( 12 ) of the neck ( 1 ).   
     
     
         2 . The structural node according to  claim 1 , wherein the screwed cap ( 3 ), on inner surface of the sleeve portion ( 10 ), has annular offsets ( 17 ) situated above the inner thread ( 5 ) ends of which are tightly set in circumferential grooves ( 18 ) provided on the outer surface of the neck ( 1 ) above the outer thread ( 4 ) and opposite to said offset ends. 
     
     
         3 . The structural node according to  claim 1 , wherein the surface of grooves of the outer thread ( 4 ) of neck ( 1 ) of bottle ( 2 ) is provided with profiled protrusions ( 19 ) and the surface of crest of the inner thread ( 5 ) of the screw cap ( 3 ) is provided with similar profiled protrusions ( 19 ′), whereas between each two neighbouring protrusions ( 19 ) on grooves of the outer thread ( 4 ) there is a profiled protrusion ( 19 ′) provided on crest of the outer thread ( 5 ). 
     
     
         4 . The structural node according to  claim 3 , wherein the profiled protrusions ( 19  and  19 ′) comprise two rectangular walls ( 20  and  20 ′) situated obliquely with respect to each other and having the form of isosceles triangles ( 21  and  21 ′) when seen from the front side. 
     
     
         5 . The structural node according to  claim 1 , wherein in the inner surface of the inner sleeve ( 8 ) of the screw cap ( 3 ) is provided with one stiffening annular offset ( 9 ) or several annular offsets ( 16 ) or a stiffening thread. 
     
     
         6 . The structural node according to  claim 1 , wherein a length (L) of the inner sleeve ( 8 ) of the cap ( 3 ) equals 0.2-1.2 of a length (L 1 ) of outer cylindrical portion ( 10 ) of the cap ( 3 ). 
     
     
         7 . The structural node according to  claim 1 , wherein the annular sealing tongues ( 11 ,  13 ) have thickness g=0.1-1.0 mm, and spaces (b) between them are 0.1-5 mm. 
     
     
         8 . The structural node according to  claim 1 , wherein outer diameters (D 2 ) of the annular sealing tongues ( 11  and  13 ) are larger than an inner diameter (D 1 ) of the neck ( 1 ) so that D 2 =1.05-1.15 D 1 . 
     
     
         9 . The structural node according to  claim 1 , wherein the cap ( 3 ) is provided with a cylindrical element joined inseparably with the bottom ( 6 ), and outer surface of the element has annular sealing tongues ( 11  or  13 ). 
     
     
         10 . The structural node according to  claim 1 , wherein the cylindrical neck ( 1 ) of bottle ( 2 ) and the cap ( 3 ) are made of Polyethylene terephthalate (PET).