The invention relates to a joint comprising a first joint arm (1) and a second joint arm (2), which is supported pivotally about a pivot axis (A) on the first joint arm (1) and with the first joint arm (1) encloses a spread angle (Φ), which is between a maximum spread angle (Φmax) and a minimum spread angle (Φmin), which is determined by the design of the joint. According to the invention, a locking device (15), which by moving a bar (8) can selectively be brought into a locking position, in which the first joint arm (1) and the second joint arm (2) are locked relative to each other, a release position, in which the first joint arm (1) and the second joint arm (2) can be pivoted freely relative to each other, and an angle limiting position, in which (i) the first joint arm (1) and the second joint arm (2) can be pivoted relative to each other up to a preset stop spread angle (ΦA) and (ii) a pivoting motion at larger spread angles (Φ) is blocked.