GB377146A - Improvements in saw blades - Google Patents

Abstract

377,146. Saws. THOMPSON & SON CO., H. G., New Haven, Connecticut, U.S.A. April 4, 1932, No. 9614. Convention date, Feb. 24. [Classes 83 (i) and 83 (ii).] Casting composite articles.-A saw blade for hack or band saws has the teeth formed in tool steel, as e.g. molybdenum or tungsten alloy which extends along one edge and over the sides of a tough flexible core, e.g. of low carbon steel. The hard steel may completely cover the core portion. The core 3 may be cast in a mould 1, Fig. 2, and the hard steel part 4 then cast on it, the core being preferably heated preliminary to this process. The blank so prepared is thicker and shorter than the required blade, and is brought to the required dimensions by heating and rolling or similar operations. The teeth are cut in the hard steel 4 which extends along one edge of the core 3, Fig. 4, and also over the sides as far as 6 to protect them from abrasion, and the blade then finished by the usual treatment. The hard steel portion 8 may be cast on the core 9, Fig. 7, so as to surround it completely ; the blank is then finished as above. In the modified form of manufacture shown in Figs. 10, 11, and 12, the core portion 11 and outer portion 10 are separately rolled to the required shapes and then united by heating, the blank being finished as before.