By Ali Al Thani

CHAIN SAW

INTRODUCTION • A Chain Saw is a portable mechanical saw powered by electricity or gasoline ; the chain

saw is used in activities cutting trees, felling, limbing, Bucking and pruning. Chainsaws have a variety of uses, and depending what someone needs one for will depend on the type of chainsaw that will provide the best option. While most of these motorized saws are used for jobs related to sawing wood, there are also models that have been specially made to cut concrete and others that are specially crafted for use in what is known as chainsaw art.

WHAT PROBLEM DID THE CHAIN SAW SOLVE • The chain saw solved a lot of problems, it helped cutting trees, the chain saw its

automatic you don’t need to use your hands a lot the chain saw has a chain that goes around the saw and it will cut the tree faster. The saw was very long and it was used by two men to cut one tree. Some chain saw are electric and some are used with fuel.

Gasoline Chain Saw. Two Man Saw. Electric Chain Saw.

THE INVENTOR • Bernard Heine was born in August 20, 1800,He died in July 31, 1846 (Aged 45] He lived

in Germany

• He invented the Oesteotome the first chain saw in the world it was small but use full.

The Oesteotome. Dr. Bernard Heine.

STORY OF INVENTION

• The German Bernard Heine invented the Chain Saw in the 1830. But several makings thought the first chain saw was built in the 1920’s but the 1830 Oesteotome predated them all. One Claimed that the Californian inventor named Muir first one to put a blade on chain saw Called “The Logging Chain Saw “. In 1926 A German mechanical engineer Andreas Stihl made a Cutoff chain saw with an electric power. In 1929 Andreas Stihl made a gasoline powered chain saw.

HOW CHAIN SAW WORK • A Chain saw has a spoke that spins and turns the chain along the bar. The chain has a

series of small blades that alternate on each side of the chain. The blades run the entire length of the chain. When the chain moves at high speeds it cuts through wood easily.

• Every chainsaw has a motor witch runs by gasoline. This two stroke motor moves the chain along the bar, and allows the machine to cut through materials like trees or hard ice.

HOW DOES CHAINSAW SOLVE THE PROBLEM• Chains saws take less time to cut trees or anything else chain saw cuts in a very high

speed it has small blades to cut through things.

WHAT HUMANS DID ABOUT THE PROBLEM BEFORE THIS INVENTION.• Humans was using Axes and saws before the invention of chainsaw. It took with them

long time to cut the trees and branches. Those time were really hard and made the workers tired of themselves.

HOW THIS INVENTION IMPROVED HUMAN LIFE • This invention helped the workers to Save time

• Workers only need to put less energy

• They can cut more trees and branches when compared to using axe and saw

• Less number of workers is required when compared to old times

DETAIL CHANGES OR IMPROVEMENTS THROUGH OUT THE TIME • The first saw was used by two people.

• This is the gasoline chainsaw.

INVENTION PROBLEMS • The chain saw caused problems by safety issues and pollution because the smoke

comes out of the chainsaw causes pollution.

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• Chain Saw Time Line • • 1830 First Chain saw • • 1861 Handcrancked Chain Saw• • 1905 Water-cooled chainsaw • • 1929 gas powered chain saw • • 1950 One Man Chain saw• • 1972 Electric ignition Chain Saw• • 1972 Chain brake/ Auto start.

TIME LINE

THE SOURCE LIST • http://inventors.about.com/od/cstartinventions/a/Chainsaws.htm

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• http://www.chainsawcarvinghistory.com/chainsaw_history/index.htm

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• https://www.google.com.qa/search?q=chain+saw+electric&btnG=%D8%A8%D8%AD%D8%AB&tbm=isch&hl=ar&source=hp&biw=1280&bih=639&gbv=2&gs_sm=3&gs_upl=5118l7888l0l9799l8l8l0l1l1l0l163l700l0.5l5l0&gs_l=img.3.0.0.5118l7888l0l9799l8l8l0l1l1l0l163l700l0j5l5l0

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• http://www.howstuffworks.com/chainsaw.htm

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• <iframe id="dit-video-embed" width="640" height="360" src="http://static.discoverymedia.com/videos/components/hsw/4655-title/snag-it-player.html?auto=no" frameborder="0" scrolling="no" allowtransparency="true"></iframe>

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• http://www.howstuffworks.com/chainsaw.htm

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• http://www.ankn.uaf.edu/publications/vs/chainsaw.html

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• http://www.google.com.qa/imgres?imgurl=http://www.marcusbicknell.co.uk/obh/img_obh5/johnb1.jpg&imgrefurl=http://www.marcusbicknell.co.uk/obh/obh5.htm&h=310&w=237&sz=7&tbnid=2DL9UlFnYnEXdM:&tbnh=90&tbnw=69&zoom=1&docid=1d3sdoPvGiahYM&hl=ar&sa=X&ei=imlpT-y1LcvjrAey_7TwBw&ved=0CE0Q9QEwBA&dur=203

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• http://www.innovateus.net/invention/chain-saws

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• http://en.wikipedia.org/wiki/Chainsaw

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• http://answers.bloglines.com/Home/how_chainsaws_work