Abstract: An upper fixed plate (3) can have an annular fixed plate (4) attached, where both are disposed at the lower end of a work arm (1) of an industrial robot. A spring-supported receiver disk (5) with an attachment ring (5a) for a gripper (2) can be supported on the upper fixed plate (3) and on the annular fixed plate (4). The upper fixed plate (3) and the annular fixed plate (4) each can have four engagement-catch recesses for ball-shaped locking elements (6). The engagement-catch recesses can be of conical shape and can have an opening angle of about 120 degrees and can have a depth of about 3 mm. In addition, the upper fixed plate (3) can be provided with two centering bores (3c) for motion-limiting pins (9). The motion-limiting pins (9) protrude into the motion-limiting bores (5c) of the spring-supported receiver disk 5. Next to the motion-limiting bores are disposed threaded bores (5b) with a threaded socket ( 7) for the ball-shaped locking element (6).

Abstract: A turbulent waterway, having boats guided in a trough made from bargrating, individual plates of which are connected with each other, the side of the trough being covered with a dense synthetic plastic film.

Abstract: The invention has reference to an overhead trolley, particularly for tracks in a store, its wheel running on a rail driven by a motor, where actuation of the pivoted auxiliary wheel assembly elevates the trolley to support the driven wheel of the trolley on a support wheel and the auxiliary wheel above a rail of the tracks. The trolley includes an arrangement with an auxiliary wheel, which may be pivoted manually into and out of engagement with the rail surface. Pivoting the auxiliary wheel into engagement with the rail surface has the effect of raising the drive wheel from the rail surface so that a disabled trolley may be pushed out of the way.