A hatch assembly includes a pivotable hatch, at least one driven arm, and at least one link. The pivotable hatch includes a hatch frame pivotable about a horizontal pivot axis at its base, and a hatch cover connected to the hatch frame. The hatch cover can move in an arcuate manner for covering an open side of the goods holder. The driven arm rigidly is connected to a drive shaft. The link is for linking the pivotable hatch frame and the driven arm so that motion of the driven arm causes pivoting motion of the hatch. The link has a first direction of extension and is rigidly connected to the hatch frame and flexibly connected to the driven arm. The link has variable length in the first direction of extension. The length of the link is reduced once a forward pivotal movement of the hatch frame is discontinued.

The disclosure relates to an overload coupling (1) which has a coupling element (2) on the input side and an output-side coupling element (3) and is designed to transfer a torque from the coupling element (2) on the input side coupling element (2) to transmit a torque to the output-side coupling element (3), and to break the form-fit and/or force-fit connection between the input-side coupling element (2) and the output-side coupling element (3) in the event of an overload. The overload coupling (1) is designed as a slip coupling, in which the coupling element (2) on the drive side and the output-side coupling element (3) together form the coupling halves of a gear coupling. According to the disclosure, it is in particular envisaged that the drive-side coupling element (2) is provided with a first front toothing (5.1) on a side facing the output-side coupling element (3), and the output-side coupling element (3) is provided with a second front toothing (5.2) on a side facing the drive-side coupling element (2), the first front toothing (5.1) is designed to be complementary to the second front toothing (5.2) in such a way that the two front toothings (5.1, 5.2) can engage in one another only when the drive-side coupling element (2) has a unique and predetermined rotational position with respect to the output-side coupling element (3).