Cradle for accessing e.g. building roof, has continuous belt mounted between driving gear and idler wheel, where belt is mechanically forced to lock in front of rails and mechanically forced to unlock when released from rail

摘要

The cradle has a cabin (11) mounted on a chassis propelled by a motorized propulsion machinery (10) and secured by security lock wheels (91). The propulsion machinery is a continuous drive belt mounted between a driving gear propelled by a brake motor and an idler wheel. Lock wheels of the continuous drive belt are mounted one above another in front of vertical smooth rails (2). The continuous drive belt is mechanically forced to lock in front of the rails, and mechanically forced to unlock when released from the rail.