| 摘要 |
A jacket crown for attachment to a primary crown, the outer side of the primary crown and the inner side of the jacket crown having in each case at least one section aligned parallel to the direction of attachment, and both sections matching each other. The technical problem is that of designing a jacket crown in such a way that it is possible at any time to adjust or readjust the frictional engagement or frictional force. The inner side (7) of the jacket crown (5) has, in the area of the said section, a tongue (8), inserted with its root (11), having an elastic arm (23) facing towards the end opening of the jacket crown (5) and projecting into the end opening, the arm being in frictional engagement with the outer side (6) of the primary crown (4). <IMAGE> |
