Andreas Stihl Ag Co. Kg

Jan Föhrenbach

Alexander Fuchs

Klaus-Martin Uhl

Jochen Buchholtz

Oliver Gerstenberger

Berthold Schell

Gerd Densborn

David Hampe

Benjamin Barth

Klaus Dussler

Tobias Wörner

Ulrike Neumann

Christine Huentz

A guard tube assembly for a drive shaft of a power tool has a guard tube with a tube cross section deviating from a circular shape and having an inner contour and a center. An inner support tube inside the guard tube supports the drive shaft. The inner support tube has a bearing sleeve supported by support elements on the inner contour. The inner contour has a first and a second circumferential section. The first circumferential section has a smallest spacing to the center and the second circumferential section has a largest spacing to the center. The elastic support elements have a contact surface contacting the inner contour and spaced at a contact surface spacing to the center. The contact surface spacing is longer than the smallest spacing of the first circumferential section and shorter than or identical to the largest spacing of the second circumferential section.

Guard tube for supporting a drive shaft of a hand-guided power tool

The invention relates to a chipper chain () for a motor-driven chain saw () as well as a chain saw having such a chipper chain (). The chipper chain () includes drive links (), connecting links (), and cutting links (). The drive links () each have a drive projection (). The cutting links () each have an upper cutting blade () and a depth limiter () which leads the upper cutting blade (). The chipper chain () has a maximum width (A) which is defined by the upper cutting blades (), a maximum height (C) which is measured perpendicularly to its longitudinal axis and extends from the drive projection () to the upper cutting blade (), and an average divide (T) predetermined by the average distance of adjacent pivot pins (). The product of the maximum width (A), the maximum height (C), and the average divide (T) is &#x2264;450 mm. The driving power of the motor-driven chain saw () is &#x2264;1.0 kW.

Chipper chain and motor-driven chain saw having a chipper chain

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.

Hand-guided power tool with telescoping section

A power tool has a sprocket wheel cover mounted on a housing and a guide bar secured between housing and sprocket wheel cover and having a guide groove for a saw chain. The guide bar has a guide slot extending in a longitudinal direction of the guide bar and guiding the guide bar on a guide element for longitudinal movement relative to the housing. The guide bar has a first exterior side extending in a first plane and facing the housing and a second exterior side extending in a second plane and facing the sprocket wheel cover. The guide bar has an oil supply opening extending from the second exterior side into the guide groove and connected by an oil supply channel with an oil supply device. The oil supply channel has a channel section separate from the guide bar and extending from the first to the second plane.

Hand-guided power tool with a guide bar

A cutting assembly of a chainsaw includes a saw chain and a guide bar () for guiding the saw chain () along a peripheral edge () of the guide bar. The saw chain () has drive links () having drive bases () which with their side surfaces (') are slidingly guided between the side walls () of a guide groove () of the guide bar () with the formation of a friction pairing. Lubricant pockets () are formed in the side surface (). The lubricant pockets () are only open toward the corresponding side wall () of the guide groove () and are otherwise closed. Offside the lubricant pockets (), the side surface () has a flat sliding surface () which slides on the side wall () of the guide groove (). The lubricant pocket () has a mean diameter and a maximum depth. The ratio of the mean diameter to the maximum depth lies in a range of 5.0 up to and including 25.0.

Growing community of inventors

Fellbach, Germany

Jan Föhrenbach