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    • 6. 发明专利
    • FILE GUIDE FOR USE IN SHARPENING A SAW CHAIN
    • GB1435076A
    • 1976-05-12
    • GB282375
    • 1975-01-22
    • OMARK INDUSTRIES INC
    • B23D63/16B23D69/02B23D63/10
    • 1435076 File guides OMARK INDUSTRIES Inc 22 Jan 1975 [28 Jan 1974] 2823/75 Heading B3L [Also in Division B5] A file guide for locating a file 24 when sharpening the cutting edge of a cutting link 18 of a saw chain and wherein said link 18 includes a top plate 20 containing the cutting edge and a depth gauge 22 separated by a gullet 25, comprises a reference plate having a bottom surface 10b made up of two spaced planar reference surfaces one on each side of the file 24 and which rest respectively on the depth gauge 22 and top plate 20, a pair of depending lugs 12 defining a chain receiving channel therebetween each of the lugs having an opening aligned with each other to receive the file; and wherein the reference surfaces and lug openings are interrelated to locate the file relative to the cutting edge to be sharpened. The file passes through the gullet 25 and lug openings to hold the guide and file on to the saw chain. The guide may be made from plastics material with metal collets to line the lug openings which receive the file. An opening is made through the guide to view the cutting edge when being filed. Reference marks on the top of the guide which are aligned in the direction of the saw chain assist in the alignment of the file along the inclined cutting edge.