In order to simplify the design without loss of operational reliability, the bracket joint half is composed of two bearing cheeks (42, 43) which are arranged at a distance from one another and hold the second spindle (39) in its end regions. The bracket (41) is provided between the two bearing cheeks (42, 43). The end of the pull arm (54) has, for the second spindle (39), a cutout, the angular length of which, as seen from the third spindle (53), permits the pull arm (54) to swivel and which has a width corresponding at least to the transverse dimension of the second spindle (39). In the non-pivoted state of the bracket (41), the geometrical longitudinal axis of the second spindle (39), as seen from the geometrical longitudinal axis of the third spindle (53), lies at a first angle with respect to a horizontal plane passing through the geometrical longitudinal axis of the third spindle (53). This angle is at most as great and preferably smaller than the second angle between this horizontal plane and the geometrical longitudinal axis of the push arm. IMAGE
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