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OLFA Corporation (オルファ株式会社, Orufa Kabushiki-gaisha) is a Japanese manufacturer of utility knives, founded in 1956 in Osaka, Japan. The name is derived from the Japanese words oru (折る, bend and break) and ha (刃, blade). The company is known for inventing the snap-off blade and the rotary cutter.
Most chainsaw safety features are focused on the kickback problem, and seek to either avoid it (chain and bar design), or to reduce the risk of injury should it occur (chain brakes). In addition to the safety features built into the chainsaw, operators should also wear specific chainsaw safety clothing. Most older saws have few or none of these ...
Chainsaw engines are traditionally either a two-stroke single-cylinder gasoline (petrol) internal combustion engine (usually with a cylinder volume of 30 to 120 cm 3) or an electric motor driven by a battery or electric power cord. In a petrol chainsaw, fuel is generally supplied to the engine by a carburetor at the intake.
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Some use standard blades, others specialized double-ended utility blades. The user can adjust how far the blade extends from the handle, so that, for example, the knife can be used to cut the tape sealing a package without damaging the contents of the package. When the blade becomes dull, it can be quickly reversed or switched for a new one.
The saw chain, or cutting chain, is a key component of a chainsaw. It consists of steel links held together by rivets , and superficially resembles the bicycle -style roller chain , although it is closer in design to a leaf chain.