OBSTACLE DETECTING APPARATUS FOR BLIND PEOPLE Russian patent published in 1996 - IPC

FIELD: device for detecting obstacles. SUBSTANCE: coded lock has body, catch, indicating sleeve with code signs indicative of angular position of code disks, pack of composite code disks with laying washers, L-shaped stop positioned in guiding slot of catch and in following slots of lock body, control shaft with axial motion indicator, faceplate for retaining code unit members in catch, units for discrete setting of axial and angular position of control shaft and unit for blocking transmission of loading from locked catch to code disks. Blocking unit is formed as protective projection positioned on limiter protrusion of stop. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 11 dwg