| 摘要 |
<p>905,662. Sawing. PFEFFER, J. W. Dec. 30, 1958 [Jan. 6, 1958], No. 42059/58. Class 145. A saw-blade 10 of uniform thickness with integral teeth 12 has preformed plates 30 of hard material, such as sintered carbide, brazed to one side of the tips of alternate teeth, the plates being tapered inwardly and rearwardly to a feather edge to give cutting clearance and set to the teeth. Because of the thinness of the plates, the teeth can be sharpened without the necessity of a diamond grinding-wheel; during sharpening, clearances 24 and 26 are given to the teeth. The plates need not extend fully to the rear edge 20 of the teeth tips provided they present sufficient surface for adequate anchoring. In an embodiment applied to a chain saw, a preformed plate is applied by bonding to the side surface of the chisel tooth and is arranged to project from such surface and to taper from its cutting-edge downwardly to this surface. Such a plate is shown in Fig. 6 on the side surface 34 of a tooth 38 and as having a lateral extension which is also bonded to the back surface of the tooth and tapers from the cutting- edge 42 to such surfaces.</p> |
