Andreas Stihl

Gotz Landwehr

Helmut Lux

Hermann Weiss

Gisbert Kohler

Hans-Georg Kaiser

Bernd Lindemann

The invention is directed to a saw chain for a power-driven chain saw. The saw chain includes a plurality of cutting links, a plurality of connecting links and a plurality of driving links. The links are interconnected by rivets to define the saw chain. The cutting links include a cutting tooth and a rearward foot defining a tilt edge. The cutting link tilts about the tilt edge when the cutting tooth penetrates the wood to be cut. In tilting about the tilt edge, the cutting edge of the cutting tooth is raised from a first elevation to a second elevation and the difference between these elevations is the tilt displacement. The tilt edge lies in a vertical plane which is perpendicular to a traverse plane containing the axes defined by the forward and rearward openings for the linkage rivets connecting the cutting link to the rest of the saw chain. The tilt edge is formed on the rearward foot at a location thereon such that the vertical plane lies within the forward half of the cutting tooth thereby reducing the tilt displacement to a predetermined magnitude. Accordingly, during the cutting operation of the saw chain, the tilt displacement is small and the cutting tooth does not draw itself into the wood to too great an extent whereby a more uniform cutting action by the cutting teeth of the cutting links is achieved and vibration of the saw chain is reduced.

Saw chain for a power-driven chain saw

A safety device on a power saw which is provided with two handles, especially for a power chain saw. The saw has a brake which engages a drive member of the cutting tool of the saw under the effect of a force retainer; the brake is held in the ineffective or inoperative position by a stop which is actuated by operating elements associated with the two handles. The stop is locked in its locking position and is releasable by means of an adjustment device which is driven by an energy source supplied by the engine of the saw, and is controlled by a control device which is connected to the operating elements which are embodied as key or contact switches.

Safety device on a power saw

A muffler, especially for a portable internal combustion engine, particularly for driving a motor chain saw, which muffler comprises an exhaust gas receiving chamber which is defined by a chamber wall and by a pan-shaped housing wall including an inlet for the exhaust gases. Arranged on the inside surface of the chamber wall there is arranged an exhaust gas conveying passage communicating with the exhaust gas chamber and being adapted to deflect an exhaust gas current by preferably 90.degree.. This passage is adapted to convey the thus deflected exhaust gas current through an aperture in the chamber wall. Above this aperture on the outside of the chamber wall and projecting therefrom there is provided a bend from which the exhaust gas current through an outlet in the bend flows at least approximately parallel to a portion of the chamber wall. Furthermore, transverse to the out-flow direction of the exhaust current and spaced from the last mentioned outlet at least one turbulence creating member is provided for creating turbulence in the exhaust current having passed through the outlet.

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Berglen-Rettersburg, Germany

Gotz Landwehr