Key for doorlock with web, shaft and ring

摘要

The key comprises web, shaft and ring and whose masses are determined via the influence of the part moments about the key axis and the resulting total moment. The stable rest position of the total moment is designed to be so far away from the vertical that in this position the key can not fall out of the lock. The total moment is designed to be permanently in the opposite direction to that of the web. The additional moment opposing the web is achieved via the design position of the mass of the ring.