TROLLEY ASSEMBLY FOR DRILLING MAST

原文（中国語）

A trolley assembly includes a first trolley. The first trolley includes a first assembly including a first positioning system. The first positioning system includes a first housing and a first rotatable element. The first trolley also includes a second assembly separate from the first assembly and removably coupled with the first assembly via a drilling mast. The second assembly includes a second positioning system. The second positioning system includes a second housing and a second rotatable element. The first trolley further includes an actuation device disposed in at least one of the first positioning system and the second positioning system. Upon operation of the actuation device, the actuation device rotates the drilling mast relative to each of the first housing of the first positioning system and the second housing of the second positioning system to dispose the drilling mast at a plurality of work positions.