Drum counter with integral alignment for mileometer - uses sprung tooth mechanism to locate wheels in alignment

摘要

Eacgh wheel of the drum (22) contains an internal cylindrical protrusion (30) which is crowned with teeth (32). The other side of the wheel also contains a cylinder with at least two teeth. The wheels are held together with a spring allowing relative rotation of the wheels but ensuring the wheels settle in a position where the numbers on the outer rim are aligned. ADVANTAGE - Better display of numbers in mileometers, etc.