Patent ID: 7861872

Claim:
A trolley assembly comprising: means for supporting a spreader assembly, said means including: cables; a first carrier portion and a second carrier portion, said carrier portions in rolling engagement with a crane beam; first and second carrier portions; a trolley separation means for selectively varying the relative position of the first and second carrier portions; a spreader assembly, said spreader assembly comprising: a first and a second spreader frame; a first and a second head portions which respectively engage with said first and second spreader frames; and a spreader separation means for adjusting the relative position of the head portions; wherein said first spreader frame is connected to said first carrier portion and said second spreader frame is connected to said second carrier portion by said cables; and wherein when the spreader separation means displaces said first and second head portions, the orientation between the first head portion and the first carrier portion and the orientation between the second head portion and the second carrier portion is maintained by the trolley separation means displacing the relative position of the first carrier portion with respect to the second carrier portion.