Spring holding part for fixing screw tension spring has external thread basic diameter larger than spring's internal diameter when compressed and/or external thread pitch greater than spring pitch when compressed

摘要

The spring holding part (9, 11) has several turns of an external thread onto which the coil spring (13) is screwed. The basic diameter of the external thread is larger than the internal diameter of the spring when compressed and/or the pitch of the external thread is greater than the pitch of the spring when compressed.