| 摘要 |
<p>1,074,238. Sawing. OMARK INDUSTRIES Inc. Sept. 22, 1964 [Sept. 23, 1963], No. 38625/64. Heading B5L. A saw chain comprises side links 15, 16 pivotally connected to the forward and rearward portions of centre links 12, the side links including cutter links and having adjacent ends provided with a plurality of gear teeth 42 forming segments concentric with the pivot axes of the side links and meshing with each other to provide opposite pivotal movement of longitudinal adjacent side links with respect to the centre drive link pivotally connected to the adjacent side links. The centre links have the distance between their pivots shorter than that between the pivots of the side links to leave spaces 48 for receiving the teeth 50 of the sprocket 44 of a chain saw machine, the teeth thereby acting along the longitudinal line containing the axes of the pivots; each centre link also has a projection 20 which is received in the space between the teeth of the sprocket and slides along the groove in the cutting bar of the machine. Alternate cutter links are left and right handed and each link has a depth gauge element 26 and a cutter element 28 formed by a curved shank portion 32 and top plate 34, the front edges of which are provided with a cutting edge 35. The ends of the side links 15, 16 are formed with the gear teeth 24 which, together with the arrangement of the sprocket teeth and gaps 48, prevent undesirable movements of the links as they pass over the sprocket particularly if the cutter links are of the type which are sharpened by a grinding wheel as they pass over the sprocket.</p> |
