This disclosure relates to a leaf cleaning device including: a housing; an air inlet configured to suck leaves into the housing; an air outlet configured to discharge leaves from the housing, the air outlet connected to a leaf collection apparatus; a motor located inside the housing; and a leaf pulverizing apparatus driven by the motor and configured to pulverize the leaves, wherein an area of the air inlet is greater than 260 square centimeters.

A crack and crevice cleaning tool has a portion of circular cross section for attachment to a source of vacuum such as a vacuum cleaner, and a flattened nozzle portion for placement next to a crack or crevice and guide means mounted at the end of the nozzle portion and insertable in the crack or crevice being cleaned to guide the tool.

Method for operating a dirt collecting device for a sweeping vehicle or for a vacuum cleaner nozzle of a floor or upright vacuum cleaner, which each comprise a suction fan with controllable speed and/or power, wherein in a first method step, the suction power of the suction fan is set at such a low level that the suction pressure in the dirt collecting device or the vacuum cleaner nozzle is merely sufficient to convey and deposit the absorbed coarse dirt into the intermediate container, and to convey the absorbed fine dirt into a downstream collection container, (normal operation); and that in a second method step, the filling level in the intermediate container is detected with respect to the coarse dirt deposited therein; and that in a third method step, if the filling level in the intermediate container is exceeded, the suction power of the suction fan is increased such that the coarse dirt, which is temporarily deposited in the intermediate container, becomes dispersible and is conveyed into the downstream collection container (emptying mode).

A floor-cleaning machine is provided, comprising a chassis, a suction bar apparatus arranged on the chassis, a dirt-holding container, a retaining apparatus, which retains the dirt-holding container movably in relation to the chassis in either a dirt-holding position or a dirt-discharging position, wherein the retaining apparatus comprises a parallelogram guide having a first link and a second link, which are each respectively articulated to the dirt-holding container and to the chassis or an element connected thereto, wherein the first and second links are oriented parallel and the retaining apparatus is configured such that a pivoting orientation of the dirt-holding container in relation to the chassis is maintained during transition from the dirt-holding to the dirt-discharging positions, and a tipping drive is associated with the dirt-holding container, by means of which the dirt-holding container in the dirt-discharging position is configured to be brought into an emptying position for dirt by tipping.

A dust mitigation system for a mobile sweeper, the dust mitigation system including a cover to at least partially cover one or more brushes of the mobile sweeper, a dust collector including at least one fan and one or more filters, and at least one duct fluidly connecting the cover with the dust collector.

The invention is in the field of a mobile installation for street cleaning, also referred to as a cleaning machine for a road or pavement or gutter, for removing undesirable matter from roads or like surfaces, with or without moistening of the surface. These machines are used to remove objects, such as small items, such as leaves, and debris, and dirt from a road or the like, using a broom system for cleaning the road or the like, and typically a storage for removed objects and dirt.

The invention is in the field of a mobile installation for street cleaning, also referred to as a cleaning machine for a road or pavement or gutter, for removing undesirable matter from roads or like surfaces, with or without moistening of the surface. These machines are used to remove objects, such as small items, such as leaves, and debris, and dirt from a road or the like, using a broom system for cleaning the road or the like, and typically a storage for removed objects and dirt.

Disclosed is a road cleaning machine including a centrifugal fan assembly that includes a fan casing including a casing inlet and a casing outlet and an impeller mounted in the fan casing and rotatable about an axis of rotation for drawing fluid from the casing inlet and directing the fluid to the casing outlet, the impeller includes a splitter wall extending outwardly from the axis of rotation to define first and second blade chambers extending from first and second faces of the splitter wall respectively, the splitter wall including a splitter wall aperture, a plurality of blades being mounted in the first and second blade chambers the impeller being configured to, during rotation about the axis of rotation, direct fluid from the casing inlet through the first and second blade chambers to the fan casing outlet, the fluid being directed into the second blade chamber via the splitter wall aperture.

A cleaning device for cleaning artificial floor coverings provided with floor covering particles, such as artificial turf, comprising a sweeping device for gathering dirt particles from the floor covering, a separation device for separating the dirt particles from floor covering particles, a floor covering particle feedback device for gathering the floor covering particles separated from the dirt particles and feeding back the floor covering particles to the floor, a filter device for filtering dust particles, and a suction device which draws air from the area of the separation device through the filter device. First and second negative-pressure chambers in which negative pressure can be formed by the suction device suction are formed above and below the separation device, respectively, in fluid communication through the separation device. The first negative-pressure chamber is in fluid communication with the suction device only via the second negative-pressure chamber.

A debris collection vehicle having an enclosed volume for collecting debris and a hydraulic fan drive system for creating vacuum condition in the enclosed volume is disclosed. In one embodiment, the hydraulic fan system includes a closed loop hydraulic circuit, a variable displacement hydraulic pump disposed within the closed loop circuit, and a hydraulic motor disposed within the closed loop circuit. The hydraulic fan drive system can also include an electronic or hydraulically actuated control valve constructed and arranged to adjust the output of the hydraulic motor via a displacement actuator based on pressure in the closed loop hydraulic circuit.