Patent ID: 9518437
Filing Date: 2016-12-13
CPC Classification: E21B

Claim Text:
1. A downhole tool extending in a longitudinal direction, comprising: a tool housing; a first arm assembly pivotally mounted about a first pivot point fixed in relation to the tool housing and movable between a retracted state and a projecting state in relation to the tool housing; and a first arm activation assembly configured to move the first arm assembly between the retracted state and the projecting state, the first arm activation assembly being arranged inside the tool housing and having a first end face and a second end face, the first arm activation assembly comprising: a first piston housing comprising a first piston housing part and a second piston housing part, the second piston housing part being removably connected to the first piston housing part to define a first piston chamber extending in the longitudinal direction of the downhole tool, a first piston member arranged at least partly within the first piston chamber and connected with the first arm assembly, the first piston member being movable in the first piston housing in the longitudinal direction of the downhole tool, and a first through-going fluid channel in the first and second piston housing parts; a second arm assembly pivotally mounted about a second pivot point fixed in relation to the tool housing and movable between the retracted state and the projecting state in relation to the tool housing; and a second arm activation assembly configured to move the second arm assembly between the retracted state and the projecting state, the second arm activation assembly being arranged inside the tool housing and having a third end face and a fourth end face, the second arm activation assembly comprising: a second piston housing comprising a third piston housing part and a fourth piston housing part, the fourth piston housing part being removably connected to the third piston housing part to define a second piston chamber extending in the longitudinal direction of the downhole tool, a second piston member arranged at least partly within the second piston chamber and connected with the second arm assembly, the second piston member being movable in the second piston housing in the longitudinal direction of the downhole tool, and a second through-going fluid channel in the third and fourth piston housing parts; wherein the first arm activation assembly and the second arm activation assembly are arranged in succession in the longitudinal direction so that the second end face and the third end face are abutted to provide connection between the first through-going fluid channel and the second through-going fluid channel.