A mobile carriage is movable along rails by manual rotation of a handwheel. The mobile carriage comprises a visual indicator that instantly informs a person of the locked or unlocked status of the mobile carriage. The visual indicator comprises at least one ridge on the handwheel and another ridge on...http://www.google.fr/patents/US5133265?utm_source=gb-gplus-shareBrevet US5133265 - Visual indicator with aligning ridges for indicating the status of a carriage lock for a mobile storage system having a rotatable lock actuator knob
Visual indicator with aligning ridges for indicating the status of a ...
