FIELD: transport.
SUBSTANCE: invention relates to tower cranes with boom. Safety device comprises movable locking element representing a rod translating in carriage and affected by springs in moving towards boom grating. Carriage accommodate appliances to allow pinpointing steel rope breakage and initiating retainer operation that hold movable locking mechanism in normal, retired, position and release it in the case of steel rope breakage to let it enter the boom grating.
EFFECT: automatic carriage interlocking.
8 cl, 5 dwg
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