HOIST Russian patent published in 2003 - IPC

FIELD: mechanical engineering; lifting equipment. SUBSTANCE: proposed hoist contains movable frame installed for traveling relative to guide support provided with support members, drive installed on movable frame and containing drive gear whose teeth are engaged with support members of guide support. Hoist is furnished with safety device is form of at least one self-braking drive whose power rating is less than that of hoist drive. Said drive contains member for fixing movable frame in case of interruption of supply and breakage of hoist drive, mated with support members of guide support. Said fixing member is installed on movable frame and its strength provides operation of hoist at full load. Power rating of self-braking drive of safety device is equal to 1.0-20% of hoist drive power rating, and said fixing member can be made in form of gear. Self-braking drive can be made for manual operation to lower down movable frame relative to guide support. EFFECT: improved safety in operation. 5 cl, 4 dwg