Improvements in saw chains

摘要

941,314. Sawing. OMARK INDUSTRIES Inc. Feb. 11, 1960 [Oct. 12, 1959], No. 15751/63. Divided out of 941,313. Heading B5L. A chain saw cutting link comprises a cutting element 88, Fig. 3, and a depth gauge element 100 projecting outwardly from a body portion 38, the outer trailing edge of the depth gauge element being at a greater distance forwardly of a midpoint 90 of a line 92 joining pivot holes 94 than the cutting edge of the cutting element is positioned rearwardly of the midpoint, and the outer ends of the elements having convex arcuate surfaces 98, 102 which are concentric about an axis parallel to the axes of the pivot holes. The kerf-engaging surface 102 of the depth gauge element is thus nearer the line 92 than the leading outer corner of the cutting element. A number of cutting links may be assembled into a chain saw as shown in Fig. 1, links 38, 40 being left and right side slitter cutting links, and links 42, 44 being left and right side raker cutting links. The cutting elements 88 of the slitter cutting links are inclined in both outward and forward directions, and the cutting elements 104, Fig. 4, of the raker cutting links are laterally thickened by having an extended portion 106 bent back upon itself and spot welded to the body of the link. The arcuate surfaces 98, 102, 108 on the elements may be formed, as described in Specification 941,313, during sharpening as the links travel around the driving sprocket of a chain saw, the radius of the path of travel of the link around this sprocket being less than that around the nose end of the bar of the saw.