The present disclosure provides a cleaning device, including a cleaning device body, a drive mechanism, a filtering mechanism, a liquid inlet portion, a liquid outlet portion, and a mode switching member. The drive mechanism is configured to generate a suction force to form a first water flow path with the liquid inlet portion, the filtering mechanism, and the liquid outlet portion. The mode switching member is configured to allow the cleaning device to be switched between a first motion state and a third motion state. Switching of the cleaning device between the first motion state and the third motion state includes switching of a second motion state. The cleaning device performs underwater cleaning in the first motion state, cleans a pool wall or a waterline in the second motion state, and performs water surface cleaning in the third motion state.

A construction aid and protective device for the construction aid are described herein. The protective device is configured to prevent objects from falling from the construction aid. The protective device includes a brush. The brush includes a brush head and bristles protruding from an upper side of the brush head. The bristles are arranged in one or more rows, and at least one of the one or more rows is wrapped in a net, a textile or a film.

Brush systems for transferring preforms along a rail include a cam including a follow extending from the cam, and a bracket positioned adjacent the cam. The bracket includes a slot for receiving the follow of the cam. The brush system also includes a brush assembly coupled to the bracket. The brush assembly includes a yoke positioned adjacent to and operably connected to the cam, a brush holder coupled to the yoke, opposite the cam, and a plurality of brushes positioned within the brush holder. Additionally, the brush system includes a motor coupled to and configured to rotate the cam. Rotation of the cam causes the bracket and the brush assembly to move in a first direction, and the brush holder and the plurality of brushes of the brush assembly to move in a second direction substantially perpendicular to the first direction.