Crane hook pulley system with trolley - has two sets of pulleys so that full lifting height of load hook is utilised

摘要

The upper pulleys are supported by a carriage. The two lower rope pulleys can be connected or separated from each other. One of the lower pullys can be moved upwards after releasing a lock, and it will come into contact with the carriage. A set of lower rope pulleys are arranged into pulley housings and the first set is connected by a swivelling linkage lock to a connecting piece and a load carrying hook. The pivoted blocking links can be dismantled and the lower block housings can be lifted upwards and reconnected to the housing carrying upper pulleys.