Abstract: A device for introducing openings into a disposal bag for a vacuuming device, wherein the vacuuming device has a suction head and a collecting tank. The includes components that are configured in a manner corresponding to one another, wherein the components of the device that are configured in a manner corresponding to one another include an open structure, wherein the open structure is designed to effect pressure equalization between a first region and a second region of the collecting tank. Within the meaning of the invention, it is preferred for the proposed device to include a punch and a die, wherein the punch is arranged in the suction head and the die is arranged in the collecting tank. In a second aspect, the invention relates to a vacuuming device that includes at least one proposed device. In a further aspect, the invention relates to a method for introducing openings into a disposal bag for a vacuuming device.

Abstract: A device for extracting drilling sludge for use at difficult to access locations on a building site includes a main body. The main body has a cavity on a lower side of the main body and a drilling sludge that is disposed in the cavity during a use of the device is extractable from the cavity by a suction device. The main body also has an extraction opening which opens into the cavity.

Abstract: A method for controlling a water supply system for use with a machine tool is disclosed. The water supply system includes a housing with an interface for supplying electrical energy, a water tank, a line, a pump device, a current-measuring device, a water-pressure-measuring device, and a control device. The method includes activating the pump device if the machine tool is connected to the interface and the motor current of the machine tool exceeds a predetermined threshold value, and deactivating the pump device if the machine tool is connected and the motor current undershoots a predetermined threshold value; or activating the pump device if the machine tool is not connected and the water pressure in the line undershoots a predetermined threshold value and deactivating the pump device if the machine tool is not connected and the water pressure exceeds a predetermined threshold value.

Abstract: A method for controlling a water supply system to be used with a machine tool, in particular a core boring device, is disclosed. The water supply system includes a water reservoir for storing water, a line for transporting water from the water reservoir to the machine tool, where the line contains a first section and a second section, a pump device for pumping water from the water reservoir to the machine tool, a signaling device, at least one sensor for measuring at least one parameter of the pump device, and a controller. The method includes transmitting a signal if at least one parameter of the pump device falls below a specified threshold for a specified duration and at least one specified water quantity for supplying the machine tool is available.

Abstract: A method for controlling a water supply system for use with a machine tool is disclosed. The water supply system includes a housing with an interface for supplying electrical energy, a water tank, a line, a pump device, a current-measuring device, a water-pressure-measuring device, and a control device. The method includes activating the pump device if the machine tool is connected to the interface and the motor current of the machine tool exceeds a predetermined threshold value, and deactivating the pump device if the machine tool is connected and the motor current undershoots a predetermined threshold value; or activating the pump device if the machine tool is not connected and the water pressure in the line undershoots a predetermined threshold value and deactivating the pump device if the machine tool is not connected and the water pressure exceeds a predetermined threshold value.

Abstract: A mobile electric appliance is disclosed. The mobile electric appliance includes at least one battery bay for accommodating a battery with at least one voltage-generating cell and a battery-side charge status indicator, an electrical consumer, a power connector, as well as a charging device for charging the at least one battery. In addition, the mobile electric appliance includes means for detecting the charge status of the at least one battery and a device-side charge status indicator arranged on the mobile electric appliance. The battery may also include an interface, which is prepared to relay the charge status determined to an external processing unit.

Abstract: A vacuum cleaner (11) including a housing (12) and a power cord (22), and also including a cord holder (31) arranged on the housing (12) for purposes of holding the wound-up power cord on the housing (12). The cable holder (31) has for example three holding elements (32, 37, 42), each having a free end section (33, 38, 43) that can be deflected relative to the housing (12).

Abstract: A vacuum cleaner (11) with a housing (12) and a suction hose (16) as well as to a suction hose holder (31) arranged on the housing (12) that has two holding elements (32, 37) that are at a distance from each other and that each have a receptacle (34, 39) to hold two sections of the suction hose (16), whereby additional holders (20, 35, 40) are provided at the receptacles (34, 39).

Abstract: A vacuum cleaner (11) including a housing (12) and a power cord (22), and also including a cord holder (31) arranged on the housing (12) for purposes of holding the wound-up power cord on the housing (12). The cable holder (31) has for example three holding elements (32, 37, 42), each having a free end section (33, 38, 43) that can be deflected relative to the housing (12).

Abstract: A vacuum cleaner (11) with a housing (12) and a suction hose (16) as well as to a suction hose holder (31) arranged on the housing (12) that has two holding elements (32, 37) that are at a distance from each other and that each have a receptacle (34, 39) to hold two sections of the suction hose (16), whereby additional holders (20, 35, 40) are provided at the receptacles (34, 39).

Abstract: A method for charging at least two batteries each having at least one cell is disclosed. During a first charging phase, batteries are charged sequentially to a first charge status and afterwards batteries are charged during a second charging phase sequentially to a second, higher charge status. The first charging phase is begun with the battery having the lowest charge status. In addition, a charging device for carrying out the method according to the invention and a mobile electric appliance including such a charging device are disclosed.

Abstract: A mobile electric appliance is disclosed. The mobile electric appliance includes at least one battery bay for accommodating a battery with at least one voltage-generating cell and a battery-side charge status indicator, an electrical consumer, a power connector, as well as a charging device for charging the at least one battery. In addition, the mobile electric appliance includes means for detecting the charge status of the at least one battery and a device-side charge status indicator arranged on the mobile electric appliance. The battery may also include an interface, which is prepared to relay the charge status determined to an external processing unit.

Abstract: For the automatic determination of the diameter of a tool, particularly a saw blade for an automatic wall saw, which is driven by a motor via a gear unit, the moment of inertia of the tool is used as an indicator for its diameter. Three basic solution variants are introduced. In particular, the system including a motor, gear unit and tool is treated as a dual-mass oscillator such that the elasticity of the shafts and gears is arranged as a torsion spring between the inertial masses in two discrete points while taking into account two coefficients of friction including coefficients of the known inertia of the motor rotor (?R) and of the tool (?S). This system can be described by equations which are then simplified by reasonable assumptions or premises. The selected formulations are solved for the moment of inertia of the tool to determine the diameter therefrom and to make an optimal adjustment for the drive possible which is adapted to the respective tool.

Abstract: For the automatic determination of the diameter of a tool, particularly a saw blade for an automatic wall saw, which is driven by a motor via a gear unit, the moment of inertia of the tool is used as an indicator for its diameter. Three basic solution variants are introduced. In particular, the system including a motor, gear unit and tool is treated as a dual-mass oscillator such that the elasticity of the shafts and gears is arranged as a torsion spring between the inertial masses in two discrete points while taking into account two coefficients of friction including coefficients of the known inertia of the motor rotor (?R) and of the tool (?s). This system can be described by equations which are then simplified by reasonable assumptions or premises. The selected formulations are solved for the moment of inertia of the tool to determine the diameter therefrom and to make an optimal adjustment for the drive possible which is adapted to the respective tool.

Abstract: An attachment element, including a base (1) having a bearing surface (14), a clamping member (3), and a ball (4) extending through a through-bore formed in the clamping member (3) an axis of which extends transverse to the bearing surface (14), with the ball (4) having a connection member (5) and a counter-support (88), and with the connection member (5) being rotatable relative to the ball (4) and having, at a region thereof adjacent to the base (1), a bearing element (7) projecting into the counter-support (8).