Patent ID: 8747339

Claim:
A joint, comprising: (a) a first joint arm, (b) a second joint arm, which is mounted on the first joint arm such that it can pivot about a pivot axis and which includes a spread angle with the first joint arm, which angle lies between a maximum spread angle and a minimum spread angle, determined by the design of the joint, (c) a locking device, which, by movement of a single bar, can selectively be brought into a locking position, in which the first joint arm and the second joint arm are locked relative to one another, a release position, in which the first joint arm and the second joint arm can be pivoted relative to one another without restrictions between the minimum spread angle and said maximum spread angle, and an angle-limiting position, in which (i) the first joint arm and the second joint arm can be pivoted with respect to one another up to a predetermined stop spread angle, which is smaller than the maximum spread angle, and (ii) pivoting to spread angles larger than the stop spread angle is blocked; wherein the locking device comprises (i) a stop spread angle adjustment device, (i) the bar is arranged on the first joint arm in a definably rotationally secured fashion, (ii) a stop and a recess are arranged on the second joint arm, and (iii) the locking device can be brought into the locking position by engaging the bar in the recess, can be brought into the angle-limiting position by spacing the bar from the recess, and can be brought into the release position by spacing the bar further from the recess.