Patent ID: 6318353
Filing Date: 2001-11-20
Classification: B23D,B28D

Abstract:
A saw for cutting concrete, asphalt, stone and other hard surfaces comprising:a frame;an engine mounted to said frame;a saw blade for rotational cutting; anda multispeed drive system for transmitting rotational energy from said engine to said saw blade, said multispeed drive system comprising:an engine drive shaft extending from said engine, said engine drive shaft being provided with a first sprocket assembly comprising at least two sprockets having different diameters;a jack shaft, said jack shaft being provided with a second sprocket assembly comprising at least two sprockets having different diameters and a first pulley;a saw blade drive shaft extending from said saw blade, said saw blade drive shaft being provided with a second pulley;a first flexible belt having teeth formed along an inner surface thereof, said teeth of said first flexible belt engaging one of said sprockets of said first sprocket assembly and one of said sprockets of said second sprocket assembly;a second flexible belt engaging said first pulley of said jack shaft and said second pulley of said saw blade drive shaft; anda tension device for releasably applying tension to said first flexible belt to ensure proper engagement between said first flexible belt and one of said sprockets of said first sprocket assembly and one of said sprockets of said second sprocket assembly.