Guide bar for a chain saw
AssigneeAndreas Stihl
InventorsKlaus Wieninger, Walter Sattelmaier, Wilfried Noll, Hans P. Stehle, Norbert Apfel
Life of this patent
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Abstract
A guide bar for a motor-driven chain saw is disclosed wherein the guide bar is provided with a center cutout extending in the longitudinal direction of the bar which is filled out with a bonded fiber material made of plastic and reinforced with long fibers. The guide bar reduces the weight and facilitates manipulation of the chain saw equipped therewith while at the same time providing a high strength and the capacity to take up bending and torsion loads.
Claims34
A guide bar for guiding the saw chain of a chain saw comprising:
- an elongated steel plate defining a longitudinal bar axis and having a first longitudinal end adapted for attachment to the chain saw and a second longitudinal end;
- said steel plate having a peripheral edge defining a guide groove for guiding the said chain in its movement around the guide bar;
- turn around means at said second longitudinal end for guiding the saw chain around said second longitudinal end;
- said plate defining an elongated clear and uninterrupted cutout formed therein so as to have a longitudinal cutout axis extending substantially in the same direction as said longitudinal bar axis;
- said cutout having a width measured transversely to said cutout axis and a length measured along said cutout axis;
- said length being a multiple of said width;
- and,
- a plastic insert filling out said cutout and being reinforced with long fibers to form a bonded fiber material with most of said fibers extending substantially parallel to said axes thereby making said insert and said guide bar resistant to bending and torsion forces as well as to compression and tension forces.
A guide bar for guiding the saw chain of a chain saw, the guide bar comprising:
- two mutually parallel elongated steel plates conjointly defining a space therebetween and having respective cutouts formed therein;
- a spacer member having two flat sides and being sandwiched between said steel plates;
- said plates and said spacer conjointly defining the guide bar to have a peripheral guide groove for guiding the saw chain in its movement around the guide bar;
- said bar defining a longitudinal bar axis and having a first longitudinal end adapted for attachment to the chain saw and a second longitudinal end;
- turn around means at said second longitudinal end for guiding the saw chain around said second longitudinal end;
- each of said cutouts being clear and uninterrupted and formed in the plate corresponding thereto so as to have a longitudinal cutout axis extending substantially in the same direction as said bar axis;
- each of said cutouts having a width measured transversely to said cutout axis and a length measured along said cutout axis;
- said length being a multiple of said width;
- said spacer member having inserts on respective ones of said flat sides for engaging corresponding ones of said cutouts;
- and,
- said spacer being made of plastic reinforced with long fibers to form a bonded fiber material with most of said fibers extending substantially parallel to said axes thereby making said spacer and said guide bar resistant to bending and torsion forces as well as to compression and tension forces.
Dependencies are inferred from the claim text.