Concrete saw with multispeed drive
AssigneeDiamond Products, Limited
InventorsBrian S. Edwards, Charles Markley
Life of this patent
Estimating the term…
Abstract
A concrete saw for cutting concrete and other hard surfaces or substrates. The concrete saw includes a multispeed drive for transmitting power from the saw's engine to the saw's cutting blade. The multispeed drive includes a flexible belt for transmitting rotational energy from the drive shaft of the engine to the drive shaft for the blade, and a releasable tension device for placing tension on the belt and ensuring good engagement between the sprockets of the drive shafts. Upon release of the tension device, a user may move the belt to an alternate position on the sprockets and retension the belt, thereby providing a different drive ration and speed for the cutting blade at a constant engine speed.
Claims17
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;
- and
- a 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;
- and
- a 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.
A saw for cutting concrete, asphalt, stone and other hard surfaces comprising:
- an engine;
- a saw blade for rotational cutting;
- and
- a drive system for transmitting power from said engine to said saw blade, said drive system comprising:
- a jack shaft extending across the width of said saw, said jack shaft being provided with a first multi-sheave pulley and a first sprocket assembly comprising at least two sprockets having different diameters;
- a saw blade drive shaft extending from said saw blade, said saw blade drive shaft being provided with a second multi-sheave pulley;
- an engine drive shaft extending from said engine, said engine drive shaft being provided with a second sprocket assembly comprising at least two sprockets having different diameters;
- a flexible belt having teeth formed along an inner surface thereof, said teeth of said flexible belt engaging one of said sprockets of said first sprocket assembly and one of said sprockets of said second sprocket assembly;
- a plurality of V-belts extending between and engaging said first multi-sheave pulley of said jack shaft and said second multi-sheave pulley of said saw blade drive shaft.
A saw for cutting concrete, asphalt, stone and other hard surfaces comprising an engine, a saw blade for rotation by said engine, and a multispeed drive system for transmitting power from said engine to rotate said saw blade, said multispeed drive system comprising a flexible belt and a tension device for releasably applying tension to said flexible belt, wherein said saw blade rotates at a first speed when said flexible belt is in a first position, engaging a first sprocket assembly and wherein, upon release of said tension device, said flexible belt is movable to a second position engaging a second sprocket assembly in which said saw blade rotates at a second speed that is different than said first speed.
Dependencies are inferred from the claim text.