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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 .
In the 1950s Jonsereds Fabrikers AB started producing the chain saw model "Raket" (Rocket) which, along with its successors, became a major success and Jonsereds started exporting chain saws worldwide with the biggest export market being North America. Another success was the forest crane production that started about 1959.
Chainsaws with specially designed bar-and-chain combinations have been developed as tools for use in chainsaw art and chainsaw mills. Specialized chainsaws are used for cutting concrete during construction developments. Chainsaws are sometimes used for cutting ice; for example, ice sculpture and winter swimming in Finland. [citation needed]
Small portable appliances such as chainsaws, generators, and domestic lawn mowers most commonly have one cylinder, but two-cylinder chainsaws exist. Large reversible two-cycle marine diesels have a minimum of three to over ten cylinders.
Most powered harnesses in production are equipped with the Radne Raket 120 two stroke engine which is based on Husqvarna XP3120 chainsaw parts. It has a displacement of 118 cubic centimetres (7.2 cu in) and produces about 15 hp (11 kW) at 8900 RPM if equipped with a tuned exhaust ; when coupled to a 1:3.5 belt-driven reduction drive and a 52" x ...
Japanese diesel engine manufacturer Yanmar and Dolmar-Sachs of Germany had a rotary-engined chain saw (SAE paper 760642) and outboard boat engines, and the French Outils Wolf, made a lawnmower (Rotondor) powered by a Wankel rotary engine. The rotor was in a horizontal position to save on production costs, and there were no seals on the downside.
1926–1927: Portable electric (by Andreas Stihl in 1926 in Cannstatt) and the first petrol chainsaw (by Emil Lerp in 1927). [201] A precursor of chainsaws was made around 1830 by Bernhard Heine [202] 1927: Concrete pump by Max Giese and Fritz Hull [203] 1930s: Particle board by Max Himmelheber [204]
But the company's innovation and industriousness would not last forever. In 1955, with mounting cash-flow problems and waning interest on the family's part to run the firm, Henry Disston and Sons was sold to the H.K. Porter Company of Pittsburgh. Porter's Disston Division was sold in 1978 and became the Henry Disston Division of Sandvik Saw of ...