Pretensioned spring unit comprises spring mounted between base ring and retaining ring which are held together by bayonet-type fitting made up of hooks on base and slots on retaining ring

摘要

The pretensioned spring unit comprises a spring (8) mounted between a base ring (4) and a retaining ring (6). These are held together by a bayonet-type fitting made up of hooks (12) on the base and slots (16) on the retaining ring.