Abstract: In a penstock internal maintenance system, the penstock includes an inclined portion between upper and lower ends, the upper end arranged in an edifice including a water collecting chamber and a gate bearing structure allowing a gate to close the penstock, the gate bearing structure adjacent the water collecting chamber forming a vertical pit. The system includes a set of units assembled in an assembled configuration and separated in a dismounted configuration, the units including an anchor unit, a launching unit and a penstock inspection platform unit, the units in the dismounted configuration being enter the penstock through the gate bearing structure adjacent the water collecting chamber, the units are assembled when located in the penstock, the anchor unit slidingly received and retained in the gate bearing structure, the anchor unit having two lateral edges being guided and retained in two vertical lateral grooves of the gate bearing structure.

Abstract: A robotic arm includes a first link and a first joint. The first link has internal link cables extending from one end to an opposed end thereof. The first joint is operably connected to the first link at one end thereof. The first joint has a hollow drive shaft, an off axis drive 121 and a first joint motor and first joint internal cables extending through the hollow drive shaft. The link cables and the first joint cables are operably connected. The robotic arm may further include a second joint operably connected to the first link. The second joint module has an active side, a passive side with electronic connectors, second joint internal cables, and a second joint motor and the active side is mechanically connected to the link and the electronic connectors of the passive side are operably connected to the link cables.

Abstract: A robotic arm includes a first link and a first joint. The first link has internal link cables extending from one end to an opposed end thereof. The first joint is operably connected to the first link at one end thereof. The first joint has a hollow drive shaft, an off axis drivel 21 and a first joint motor and first joint internal cables extending through the hollow drive shaft. The link cables and the first joint cables are operably connected. The robotic arm may further include a second joint operably connected to the first link. The second joint module has an active side, a passive side with electronic connectors, second joint internal cables, and a second joint motor and the active side is mechanically connected to the link and the electronic connectors of the passive side are operably connected to the link cables.

Abstract: A two joint module includes a module housing, a first joint and a second joint. The module housing has a structural support portion. The first joint has a first motor and a first motor axis and a first joint axis. The second joint has a second motor and a second motor axis and a second joint axis. The second joint axis is not parallel to the first joint axis. The first joint is attached to the structural support portion and the second joint is attached to the structural support portion.

Abstract: A two joint module includes a module housing, a first joint and a second joint. The module housing has a structural support portion. The first joint has a first motor and a first motor axis and a first joint axis. The second joint has a second motor and a second motor axis and a second joint axis. The second joint axis is not parallel to the first joint axis. The first joint is attached to the structural support portion and the second joint is attached to the structural support portion.