CATERPILLAR BELT FOR VERTICAL PROPULSION ON A SMOOTH RAIL

摘要

The present invention relates to a cradle moving along two smooth vertical rails, the propulsion machinery comprising a caterpillar belt with lock wheels mounted between a driving gear propelled by a brake motor and an idler wheel, the lock wheels being mechanically forced to lock in front of the rail, and mechanically forced to unlock when released from the rail, the rail having a rectangular cross-section with safety sides and propulsion sides, the cradle being propelled by bearing on the propulsion sides along a gripping strip and being secured in an arc abutting the lock wheels thereof against the safety sides.