Andreas Stihl Ag Co. Kg

Gerd Densborn

Harald Schliemann

Klaus Langhans

Wolfgang Weissert

Tim Gegg

Jan Föhrenbach

Benjamin Barth

Ralf Cornelsen

Christian Schmidt

Martin Strauss

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.

Starting device for starting a combustion engine and handheld work apparatus having said starting device

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.

Handheld work apparatus

A starter device for an internal combustion engine has a rope pulley and a starter rope wound onto the rope pulley. A rope guide guiding the starter rope from the guide pulley to a rope outlet opening of the starter device is provided. A guide element positioned at the rope outlet opening holds the starter rope in the rope outlet opening. The rope guide has at least one deflection element that is arranged at the rope outlet opening. The deflection element has two tangents which are intersecting each other at an angle of less than 90&#xb0;. The deflection element has a minimal radius of a length that is longer than a length of a diameter of the starter rope. The starter handle can be positioned relative to the rope outlet opening at different orientations and enables ergonomic starting of the internal combustion engine of a backpack power tool.

Starter device for an internal combustion engine and backpack power tool with an internal combustion engine and with a starter device for the internal combustion engine

A starter device for an internal combustion engine has a rope pulley and a starter rope wound onto the rope pulley. A starter handle is fastened to the starter rope. A rope guide with a first deflection roller is provided. A rope outlet opening is arranged along a circumferential section of the first deflection roller and extends along the circumferential section of the first deflection roller about a peripheral angle of the first deflection roller of at least 60&#xb0;. The rope guide guides the starter rope from the guide pulley to the rope outlet opening of the starter device. A guide element is arranged at rope outlet opening and holds the starter rope in the rope outlet opening. The starter handle can be positioned relative to the rope outlet opening at different orientations and enables ergonomic starting of the internal combustion engine of a backpack power tool.

A power tool is provided with a drive motor and a tool unit with a tool driven by the drive motor. A guide tube with telescoping section with external and internal tubes is provided, wherein the internal tube is longitudinally slidable within the external tube. A clamping device secures the internal tube relative to the external tube and has a clamping member supported rotatably relative to the internal tube and connected by a thread connection to the external tube. The clamping device is provided with a clamping ring with an opening arranged about an outer circumference of the internal tube. Compression of the clamping ring in longitudinal guide tube direction effects a size reduction of the clamping ring opening. The clamping ring has a first axial face supported relative to the external tube and a second axial face supported relative to the clamping member.

Growing community of inventors

Waiblingen, Germany

Gerd Densborn