| 摘要 |
The invention relates to a support arm for an apparatus, preferably for a display screen, comprising a first fastening part for attaching the support arm to a frame or a wall, a first member, at one end coupled to the first fastening part and at another end coupled to a first pivot joint which makes rotation about a first axis of rotation possible, a second member which, at a first end, is coupled to the first pivot joint, and, at a second end, is provided with a second pivot joint which makes rotation about a second axis of rotation possible, a second fastening part for attaching the apparatus to the support arm, which second fastening part is coupled to the second pivot joint, the first and second axes of rotation essentially being parallel to one another. The invention furthermore relates to a pivot joint for a support arm, comprising a first tube part having a longitudinal axis, a second tube part, one end of which is rotatably mounted and extends into the first tube part, and provided with an electric motor attached in the first or second tube part, the first tube part and the second tube part being coupled to one another by means of a transmission, the transmission being provided with a drive shaft, driven by means of the electric motor and in line with the longitudinal axis and with a first ring with internal toothing thereon and which is connected to the one tube part, an eccentric gear wheel with a toothing which is at least one tooth smaller than the internal toothing of the first ring and the toothing of which engages with the internal toothing of the first ring and which is provided with driver parts, and a second ring which is connected to the other tube part and which is provided with driver parts mating with the driver parts of the gear wheel, as a result of which the first and second ring rotate with respect to one another when the electric motor is in operation. |
