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Andreas Stihl designed and hand built his first chainsaw in 1926. [5] The saw was electrically powered, and weighed about 48 kg (106 lb). [6] Stihl grew slowly initially, as the chainsaws came to the market about the same time as the Great Depression; with manpower cheap, and old two-man saws proven, there was no need for power saws.
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 .
Historical osteotome, a medical bone chainsaw. The origin of chainsaws in surgery is debated. A "flexible saw", consisting of a fine serrated link chain held between two wooden handles, was pioneered in the late 18th century (c. 1783 –1785) by two Scottish doctors, John Aitken and James Jeffray, for symphysiotomy and excision of diseased bone, respectively. [2]
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An illustration of several key components in a typical four-stroke engine. For a four-stroke engine, key parts of the engine include the crankshaft (purple), connecting rod (orange), one or more camshafts (red and blue), and valves. For a two-stroke engine, there may simply be an exhaust outlet and fuel inlet instead of a valve system.
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In the Lumberjack World Championship, a one cylinder engine chainsaw is used to make three cuts, first down, then up in a white pine log. The chainsaws are off before the time starts, and cannot be self-starting or simple start engines. The record was set by Dave Bolstad of New Zealand in 2007 with a time of 5.55 seconds. [10]
Parenthood is wild, and these tweets prove it with humor that hits close to home. The post 95 Hilarious Tweets From Parents Who’ve Seen It All (August Edition) first appeared on Bored Panda.