Abstract: A ground working system includes at least one self-driving ground working device having a drive, a control unit and a battery. An operating region is determined by a boundary wire, wherein the ground working device travels over a traveling path determined by the control unit in the operating region. Connected to the boundary wire is a first base station, which transmits a signal on the boundary wire. The electromagnetic field of the signal induces a reception signal in the reception coil of the ground working device. The reception signal is processed in the control unit. In order to make a stable signal available over the entire length of the boundary wire, it is provided that the boundary wire is electrically connected to a further base station configured as a repeater, which receives the signal transmitted by the first base station, processes it and passes it on.

Abstract: A handheld work apparatus includes a drive motor, an operating-fluid tank and a motor carrier on which the drive motor is held. The operating-fluid tank has a first housing section and a second housing section. The first housing section is realized so as to be integral with the motor carrier. At least a portion of the second housing section is formed from light-transmitting material to permit discerning the fill level of the operating-fluid tank. The motor carrier has a light-transmitting light conductive element for conducting light into the operating-fluid tank.

Abstract: A green area maintenance system includes an autonomous mobile green area maintenance robot having a treatment tool and a cutting tool differing from the treatment tool. The robot and the cutting tool are configured to allow fixing of the cutting tool to the robot. The system includes a user control device, and has an autonomous operation mode and a cutting operation mode. In the autonomous operation mode the autonomous mobile green area maintenance robot with its treatment tool operates autonomously and the cutting tool is set out of operation, and in the cutting operation mode the cutting tool is fixed to the green area maintenance robot and operable. The robot with its treatment tool and cutting tool are controlled by a user via the user control device, and an operation mode switching device for switching between the autonomous operation mode and the cutting operation mode.

Abstract: A starting device for a combustion engine includes a housing relative to which a rope pulley, a spring housing and an entrainer can rotate about a rotation axis. A coupling unit produces a rotationally-fixed connection between the rope pulley and the spring housing in response to a rotational movement of the rope pulley in a starting direction. The spring housing has a spring receiving space for a tension spring and is connected to an entrainer by the spring. The coupling unit has a first coupling element and a second coupling element, which interact at a contact location which is at a spacing (d) to the rotation axis and is at least as large as the maximum spacing (c) of the tension spring to the rotation axis.

Abstract: A ground working system includes at least one self-driving ground working device having a drive, a control unit and a battery. An operating region is determined by a boundary wire, wherein the ground working device travels over a traveling path determined by the control unit in the operating region. Connected to the boundary wire is a first base station, which transmits a signal on the boundary wire. The electromagnetic field of the signal induces a reception signal in the reception coil of the ground working device. The reception signal is processed in the control unit. In order to make a stable signal available over the entire length of the boundary wire, it is provided that the boundary wire is electrically connected to a further base station configured as a repeater, which receives the signal transmitted by the first base station, processes it and passes it on.

Abstract: A manually guided implement possesses a guide tube, wherein a first mass body is disposed on a first end of the guide tube, and a second mass body is disposed on a second end of the guide tube. One of the mass bodies has a housing, and the other of the mass bodies has a tool driven by a drive motor. A power transmission mechanism for driving the tool between the first and second ends of the guide tube is guided in the interior of the guide tube. A first antivibration element is disposed between the first end of the guide tube and the first mass body. The guide tube in the direction of the longitudinal central axis thereof includes a first rigid sub-portion and a second rigid sub-portion that are connected to one another at an abutment location by at least one second antivibration element.

Abstract: An elastic connecting support for arrangement between a combustion engine and an air filter of a handheld work apparatus is disclosed. The connecting support has a first channel for largely fuel-free air and a second channel for a fuel/air mixture. The connecting support is realized as a single piece, and has, on a first side, an engine connecting flange, at which the first and second channel end, for connection to the combustion engine. The first channel has a first peripheral wall and the second channel has a second peripheral wall. The first peripheral wall and the second peripheral wall are arranged at a distance in relation to each other in a longitudinal section of the connecting support. The channels extend from the first side to a second side of the connecting support. On the second side, the first channel and the second channel end at a common connecting flange.

Abstract: A handheld work apparatus has a blower wheel. The blower wheel is held via a nut on the shaft in a manner locked against rotation by frictional force. A thread moment of friction is transmittable between the nut and the shaft via a thread section. A first moment of friction is transmittable between the nut and the blower wheel via a first friction contact surface. The first friction contact surface is configured such that, at a minimum tightening torque of the nut, the first moment of friction is greater than the thread moment of friction. As a result, during the operation of the work apparatus when there is a relative movement between the blower wheel and the shaft, the blower wheel moves the nut along therewith. The nut retensions the blower wheel against the shaft. The second friction contact surface runs conically with respect to the rotational axis.

Abstract: The invention relates to an electromagnetic valve having a valve housing (2) and a valve opening (29) with a valve seat (8) and an electric drive coil (3) and a magnetic yoke (11) and a longitudinal centre axis (14). The magnetic yoke (11) is assigned a metallic plate armature (5) which is mounted movably and has an armature disc (48). The armature disc (48) lies sealingly with a sealing surface (9) against the valve seat (8) in a first switching position of the valve, and opens the valve seat (8) in a second switching position of the valve. According to the invention, the valve seat (8) is configured on a valve component (18), wherein the valve component (18) has at least one valve opening (29) which lies at a radial spacing (r) from the longitudinal centre axis (14). The valve seat (8) of the valve opening (29), which valve seat (8) corresponds with direct body contact with the sealing surface (9) of the armature disc (48) of the plate armature (7), consists of metal.

Abstract: A method assists during felling of a tree. The method includes the steps of: providing a property of the tree and/or a property of an environment of the tree; obtaining felling information related to an ideal felling direction of the tree based on the provided property; and outputting the obtained felling information.

Abstract: A method assists during execution of a sequence of cuttings in a tree, wherein, during a cutting sequence, a first cut in the tree is followed by a second cut in the tree At least a part of an ideal course of the second cut depends on at least a part of a course of the first cut. The method includes the steps of: identifying at least the part of the course of the first cut in the tree; precalculating at least the part of the ideal course of the second cut in the tree based on the identified part of the course of the first cut; and outputting cutting information for executing the second cut based on the precalculated part of the ideal course of the second cut.

Abstract: A method determines a specific control parameter range of an autonomous mobile green area maintenance robot for an area to be treated having a specific shape and a specific size. A method operates an autonomous mobile green area maintenance robot on an area to be treated having a specific shape and a specific size using such a method. A system, in particular for carrying out such a method, and an autonomous mobile green area maintenance robot, are provided.

Abstract: A method for operating an autonomous mobile lawn mower robot having a cutting tool for mowing a lawn, wherein a cutting height of the cutting tool is adjustable, includes the steps of: receiving a prediction of an environmental condition describing parameter, and automatically adjusting the cutting height of the cutting tool as a function of the received prediction.

Abstract: A ground working system has at least one self-driving ground working device, wherein the operating region (A) of the ground working device is determined by an edge boundary. The ground working device travels automatically within the operating region (A) along a traveling path (W), wherein the ground working device has a drive, a control unit and an in-device battery for supplying energy to the ground working device. A charging station for charging the battery of the ground working device is also provided. The charging station is set up on the edge boundary without interrupting the edge boundary. The ground working device goes to the charging station for charging the battery as required.