| 摘要 |
The present invention relates to a downhole tool extending in a longitudinal direction, comprising a tool housing; an arm assembly pivotally mounted about a pivot point fixed in relation to the tool housing and movable between a retracted position and a projecting position in relation to the tool housing; an arm activation assembly for moving the arm assembly between the retracted position and the projecting position, the arm activation assembly being arranged inside the tool housing and having a first end face and a second end face adapted for being connected with the end faces of other arm activation assemblies; wherein the arm activation assembly comprises: a piston housing having a piston chamber extending in the longitudinal direction of the downhole tool and comprising: a first piston housing part, a second piston housing part removably connected to the first piston housing part, a piston member arranged inside the piston housing and connected with the arm assembly, the piston member being movable in the piston housing in the longitudinal direction of the downhole tool. |
