| 摘要 |
1503040 Container closures WICANDERS MACHINES AB 29 Dec 1975 [30 Dec 1974] 53039/75 Heading B8T A container closure comprises a top 1 and a depending skirt 2 having engaging means 3 for engaging threads or bosses on a container neck. A groove 4 having a trapezium-shaped crosssection is formed in the top 1 the base 4<SP>1</SP> of the groove defining a plane E and constituting the shorter parallel side of the trapezium. The radially outer boundary wall of the groove 4 has a continuation 5 extending to the skirt 2 while the radially inner boundary wall of the groove is joined to the central portion 10 of the top 1 via a ridge 9<SP>1</SP>. These radially inner and outer walls make acute external angles, preferably of 30 degrees with the plane E while the distance D between the ridge 9<SP>1</SP> and plane E is greater than the distance C between the central portion 10 and the plane E and the distance between the free surface of sealing compound 8 located in the groove 4 is less than the distance D. |
