# US 10,307,930 B2 · Guide bar for a saw chain having a reduced-wear direction-reversing section > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,307,930 B2 - Document ID: US10307930B2 - Status: Granted - Kind: B2 - Application number: 14/465,411 - Filed: 2014-08-21 - Published: 2015-02-26 - Granted: 2019-06-04 - Earliest claimed: 2013-08-21 - Assignees: Andreas Stihl AG & Co. KG - Applicants: Andreas Stihl AG & Co. KG - Inventors: Alexander Fuchs; Thomas Voigt; David Mitrega; Matthias Schulz; Thomas Lux; Oliver Gerstenberger; Jochen Buchholtz; Berthold Schell; Norbert Apfel; Bernd Hein; Ruediger Ludwig; Jan Foehrenbach - Web page: https://patentgrep.com/patent/US10307930B2 ## CPC - B27B 17/025: {Composite guide bars, e.g. laminated, multisectioned; Guide bars of diverse material} - B27B: SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR (saws specially adapted for pruning or debranching A01G3/08; sawing apparatus specially adapted for felling trees A01G23/091; features not restricted to a particular type of wood saw B23D, e.g. attaching saw blades B23D51/00; machine tool frames, beds, pillars or like members, in general B23Q1/01) ## Abstract A guide bar for a saw chain includes an elongate, flat base body made of a basic material. The base body extends along a longitudinal center axis and, in order to guide a saw chain, has a running surface formed on an outer periphery thereof and a guide groove formed in the outer periphery of the base body. The guide groove has a groove base. A direction-reversing section for the saw chain is provided at one end of the base body. The direction-reversing section includes at least one add-on component having a running surface made of more wear-resistant material than the basic material of the base body. The add-on component is secured to the base body of the guide bar by at least one weld seam. The weld seam extends between the add-on component and the base body and is located spatially beneath the groove base. ## Claims ### Claim 1 A guide bar for a saw chain, the guide bar defining a plane and a longitudinal center axis and comprising: an elongated, flat base body extending along said longitudinal center axis and having first and second outer flat sides; said base body having an outer periphery and having a guide track formed on said outer periphery for the saw chain; said guide track including a running surface and a guide groove having a groove base; a direction-reversing section for the saw chain configured on one end of said base body; said direction-reversing section being configured as an add-on component; said running surface, said guide groove of said base body and said groove base being continued in said add-on component so as to cause said running surface and said guide groove together with said groove base to continue in said add-on component; said base body being made of a first material and said add-on component being made of a second material having a wear resistance greater than said first material; said first and second flat sides having respective projections formed thereon in the region of said add-on component; said projections being configured to extend in the direction of said longitudinal center axis and overlap said add-on component; said add-on component having respective outer surfaces formed as support surfaces parallel to corresponding ones of said first and second flat sides of said base body and positioned in between said projections; said projections being in contact engagement with corresponding ones of said support surfaces so as to hold said add-on component therebetween; said add-on component being fixed to said base body by a first weld seam on an edge of said first outer flat side of said base body and a second weld seam on an edge of said second outer flat side of said base body; said first and second weld seams running between said add-on component and said base body and lying over their respective lengths (S) spatially below said groove base of the guide bar; and, at least one of said weld seams extending in depth perpendicularly to said first and second flat sides so as to cause one of said support surfaces of said add-on component to be welded with a corresponding one of said projections. ### Claim 2 (depends on 1) The guide bar of claim 1, wherein said base body and said add-on component conjointly define an overlapping region whereat said base body overlaps said add-on component and the corresponding weld seam is configured to delimit said overlapping region. ### Claim 3 (depends on 1) The guide bar of claim 1, wherein said add-on component has a position on said base body and is fixed form tight on said base body in said position. ### Claim 4 (depends on 3) The guide bar of claim 3, wherein said projections are configured to fix said add-on component in said position thereof on said base body. ### Claim 5 (depends on 4) The guide bar of claim 4, wherein at least one of said projections has a longitudinal edge; and, said weld seam extends along said longitudinal edge of said one projection over a segment of said length (S) thereof. ### Claim 6 (depends on 1) The guide bar of claim 1, wherein said add-on component has respective recessed regions for receiving corresponding ones of said projections thereon. ### Claim 7 (depends on 6) The guide bar of claim 6, wherein said projections are received in respective ones of said recessed regions without play. ### Claim 8 (depends on 6) The guide bar of claim 6, wherein said projections conjointly define a gap (a) therebetween and said add-on component has a thickness at said recessed regions thereof which is greater than said gap (a) so as to permit said add-on component to be clampingly held between said projections. ### Claim 9 (depends on 1) The guide bar of claim 1, wherein said wear resistant material of said add-on component is a sintered material. ### Claim 10 (depends on 9) The guide bar of claim 9, wherein said wear resistant material of said add-on component is a stellite. ### Claim 11 (depends on 1) The guide bar of claim 1, wherein said add-on component comprises two add-on component halves placed together to define said add-on component. ### Claim 12 (depends on 11) The guide bar of claim 11, wherein said two add-on component halves are identical parts. ### Claim 13 (depends on 11) The guide bar of claim 11, wherein said add-on component defines a partition plane; and, said first and second weld seams merge with each other at said partition plane. ### Claim 14 (depends on 1) The guide bar of claim 1, wherein each of said projections has a longitudinal edge which extends along said groove base. ### Claim 15 (depends on 1) The guide bar of claim 1, wherein each one of said weld seams lies spatially below said groove base in the longitudinal direction of said guide track over the entire length (S) of the weld seam; said one weld seam is at a distance (A) from said groove base measured in the plane of said guide bar; and, said distance (A) is less than three times the depth (T) of said guide groove. ### Claim 16 (depends on 15) The guide bar of claim 15, wherein said distance (A) is less than two times the depth (T) of said guide groove. ### Claim 17 (depends on 1) The guide bar of claim 1, wherein each one of said weld seams follows the course of said guide track so as to cause the distance between the weld seam and guide track at the tip of said guide bar to be at most twice as great as the distance between the weld seam and the guide track at the butt edge of the add-on component to the base body of said guide bar. ### Claim 18 (depends on 17) The guide bar of claim 17, wherein segments of each one of said weld seams are connected to each other via an arcuate segment of the weld seam; and, said arcuate segment has a maximum spacing to said guide track which is less than twice the depth (T) of said guide groove. ### Claim 19 (depends on 17) The guide bar of claim 17, wherein the distance of the weld seam to the guide track measured perpendicularly to the tip of the guide bar is less than thrice the depth (T) of said guide groove. ### Claim 20 (depends on 1) The guide bar of claim 1, wherein each of said weld seams, viewed in a direction toward said groove base, is arranged below said groove base so as to cause material stress in the region of said guide groove to be reduced. ### Claim 21 (depends on 1) The guide bar of claim 1, wherein said direction-reversing section is configured without a direction-reversing sprocket wheel. ### Claim 22 (depends on 1) The guide bar of claim 1, wherein each one of said weld seams extends in depth in the region of said add-on component to between said projections so as to cause a first one of said weld seams on said first outer flat side and a second one of said weld seams on said second outer flat side to touch each other.