Robot arm, having: - a basic frame , - a slide , which is mounted displaceably in a vertical direction on the basic frame , and a first motor (M1), which is designed to adjust the slide relative to the basic frame , - a proximal pivoting member , which is mounted pivotably about a vertical first axis of rotation (D1) on the slide , and a second motor (M2), which is designed to pivot the proximal pivoting member relative to the slide , - an intermediate pivoting member , which is mounted pivotably about a vertical second axis of rotation (D2) on the proximal pivoting member , and a third motor (M3), which is designed to pivot the intermediate pivoting member relative to the proximal pivoting member , - a distal pivoting member , which is mounted pivotably about a vertical third axis of rotation (D3) on the intermediate pivoting member , and a fourth motor (M4), which is designed to pivot the distal pivoting member relative to the intermediate pivoting member , - an actuating member carrier , which is mounted rotatably about a horizontal fourth axis of rotation (D4) on the distal pivoting member , and furthermore having: a first switchover device (9.1), which is designed to switch over the actuating member carrier between a first locking pivoting position, in which the actuating member carrier takes up a first position, and a second locking pivoting position, in which the actuating member carrier takes up a second position, which deviates from the first position, for mechanically reconfiguring the kinematic structure of the robot arm , characterized in that the actuating member carrier can be reconfigured between precisely two positions by means of the switchover device (9.1). - a basic frame , - a slide , which is mounted displaceably in a vertical direction on the basic frame , and a first motor (M1), which is designed to adjust the slide relative to the basic frame , - a proximal pivoting member , which is mounted pivotably about a vertical first axis of rotation (D1) on the slide , and a second motor (M2), which is designed to pivot the proximal pivoting member relative to the slide , - an intermediate pivoting member , which is mounted pivotably about a vertical second axis of rotation (D2) on the proximal pivoting member , and a third motor (M3), which is designed to pivot the intermediate pivoting member relative to the proximal pivoting member , - a distal pivoting member , which is mounted pivotably about a vertical third axis of rotation (D3) on the intermediate pivoting member , and a fourth motor (M4), which is designed to pivot the distal pivoting member relative to the intermediate pivoting member , - an actuating member carrier , which is mounted rotatably about a horizontal fourth axis of rotation (D4) on the distal pivoting member , and furthermore having: a first switchover device (9.1), which is designed to switch over the actuating member carrier between a first locking pivoting position, in which the actuating member carrier takes up a first position, and a second locking pivoting position, in which the actuating member carrier takes up a second position, which deviates from the first position, for mechanically reconfiguring the kinematic structure of the robot arm , characterized in that the actuating member carrier can be reconfigured between precisely two positions by means of the switchover device (9.1). a first switchover device (9.1), which is designed to switch over the actuating member carrier between a first locking pivoting position, in which the actuating member carrier takes up a first position, and a second locking pivoting position, in which the actuating member carrier takes up a second position, which deviates from the first position, for mechanically reconfiguring the kinematic structure of the robot arm , characterized in that the actuating member carrier can be reconfigured between precisely two positions by means of the switchover device (9.1). <EOS>