Patent ID: 6926259
Filing Date: 2005-08-09
Classification: B66D,E21B

Abstract:
1. A hoist system for use on a drilling rig, comprising a. a tubular mast comprising: b. a splittable block connected to the mast top side; c. a trolley comprising a trolley top side and a trolley bottom side, wherein the trolley top side is connected to the splittable block and wherein the trolley is removably secured on the mast front side; d. a gripper connected to the trolley bottom side for gripping a load; e. a hoist cable passing through the splittable block and connected on one end to a hoist cable winch; and f. a hoist cable winch adapted to pull the hoist cable over the mast top side and through the splittable block to move the trolley relative to the tubular mast and lift a load.