| abstract |
In combination with a cylindrical housing, a closure cap including a transverse end wall and cylindrical shell defining a bore and open end. A sealing device arranged between the bore and open end has an outer cylindrical sealing surface mating with an inner cylindrical sealing surface on the housing. A coupling device is arranged between the closure cap and cylindrical housing and includes three spiral webs on the inner surface of the closure cap shell between a first and second transverse plane. The first plane is remote from the end wall and the second plane is close to the end wall, each web having respective ends in the first and second plane, the ends in the first plane being circumferentially spaced from the ends in the second plane by an angle of less than 120 degrees. Three guide lugs radially extend from the cylindrical housing for engagement with the webs, the guide lugs being circumferentially spaced from each other by an angle of about 120 degrees. The second place has a distance from the transverse end wall of the closure cap which exceeds the length of the guide lugs extending parallel to the longitudinal axis of the housing. |