Jib crane with polycentrical trajectory
OwnerClaudio Sperainventor
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Abstract
The object of the present invention consists in a tower traveling crane which, being endowed with a special jib movement system is characterized in that--differently from other types of similar cranes--its vertical dimensions can be kept to a minimum, though operating with the amplest jib range of movements and overcoming frontal obstacles of remarkable height.
Claims4
A tower crane comprising a vertical tower, a trolley movable vertically on said tower, a jib pivotally connected to said trolley and extending at an angle from said vertical tower, a pulley at an outer end of said jib, a hoist running over said pulley and down to a suspended load and means for varying the angle of said jib as a function of the vertical position of said trolley to decrease the angle between said jib and said tower when said trolley descends and conversely to increase the angle between said jib and said tower as said trolley ascends.
Dependencies are inferred from the claim text.