Wiper arm device, wiper arm, and screen wiper system

A wiper arm device for a wiper arm (20), the wiper arm device comprising at least one fastening part (44) which is configured to connect at least one articulation part (38) of the wiper arm (20) to a drive shaft (24) of a wiper drive (16), wherein the fastening part (44) has at least one fastening boss (46) for fastening the fastening part (44) to the drive shaft (24) and at least one articulation boss (48) for fastening the articulation part (38) to the fastening part (44), characterized in that the fastening part (44) has at least one line receptacle (52), wherein the wiper arm device includes a line unit (36) disposed within the line receptacle (52), wherein the line receptacle (52) includes a first force-fit or form-fit element (64) which is disposed within an interior of the fastening part (44) and is configured to at least partially fix or hold the line unit (36) on the fastening part (44), wherein the line receptacle (52) includes a second force-fit or form-fit element (64) which is disposed within an interior of the fastening part (44) and is configured to at least partially fix or hold the line unit (36) on the fastening part, wherein the line unit (36) includes two line elements (60, 62), and has a connection element (84, 86) for connecting in a releasable manner the two line elements (60, 62), wherein the connection element (84, 86) is disposed in the line receptacle (52) and is a separate element from the first force-fit or form-fit element (64) and the second force-fit or form-fit element (64), wherein the connection element (84, 86) is disposed longitudinally between the first force-fit or form-fit element (64) and the second force-fit or form-fit element (64) along a longitudinal direction, wherein each of the first force-fit or form-fit element (64), the second force-fit or form-fit element (64), and the connection element (84, 86) is spaced longitudinally from the fastening boss (46), wherein the first force-fit or form-fit element (64) includes a first set of walls that extend at oblique angles relative to the longitudinal direction and define a first conduit opening (76) within the interior of the fastening part (44) for guiding the line conduit (36), and wherein the second force-fit or form-fit element (64) includes a second set of walls that extend at oblique angles relative to the longitudinal direction and define a second conduit opening (78) within the interior of the fastening part (44) for guiding the line conduit (36).