Patent ID: 6926103
Filing Date: 2005-08-09
Classification: B66D,E21B,Y10S

Abstract:
1. A hoist system comprising a. a derrick comprising b. a splittable block connected to the derrick top side; wherein the splittable block comprises a plurality of moveable loose pulleys secured to either the movable trolley or the derrick and a plurality of fixed pulleys secured to the derrick; c. a hoisting cable guided through the splittable block; d. a moveable trolley comprising a trolley top side and a trolley bottom side, wherein the trolley is connected to the splittable block and wherein the moveable trolley is removably secured on the derrick; and e. a hoist winch adapted to pull the hoisting cable over the derrick top side and through the splittable block to move the moveable trolley relative to the derrick.