Snow blower
A snow blower or snow thrower is a machine for removing snow from an area where it is not wanted, such as a driveway, sidewalk, roadway, railroad track, ice rink, runway, or houses. The misnomer "snow blower" is often used, as both single stage and two stage machines actually throw the snow using an auger or impeller instead of blowing it. It can use either electric power (line power or battery), or a gasoline or diesel engine to throw snow to another location or into a truck to be hauled away. This is in contrast with the action of snow plows, which push snow to the front or side (shovels can be similarly used).
Snow throwers range from the very small, capable of removing only a few inches (a few cm) of light snow in an Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). path, to the very large, mounted onto heavy-duty winter service vehicles and capable of moving 20-foot (6.10 m) wide, or wider, swaths of heavy snow up to 6 feet (1.83 m) deep. Snow blowers can generally be divided into two classes: single-stage and two-stage.
Jet-engine snow blowers
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Jet engines and other gas turbines are used for large scale propelling and melting of snow over rails and roads. These blowers first were used in Russia and Canada in the 1960s as the large amounts of snow fall were becoming problematic for their train tracks and road ways, and were later introduced into the US by the Boston Transportation Authorities.
The jet engine allows to melt the snow on the tracks and clear the roads faster than other methods, as they offer considerably greater power in a relatively lightweight machine. However, this method is much more expensive than traditional snow removing methods. In Russia, the high cost is partially negated by utilizing retired Jet Fighter engines to this end, such as the Klimov VK-1.[1][2][3]
Safety issues
The U.S. Consumer Product Safety Commission estimates that each year there are approximately 5,740 snowblower related injuries in the United States which require medical attention.[4] One problem with the design of the snow blower is that snow can build up in the auger, jamming it and stalling the motor. This is complicated by the fact that the auger could deform before applying enough resistance to the motor to turn it off. If the jam is cleared by hand, it is possible for the auger to return to its natural shape suddenly and with great force, possibly injuring the user; snow blowers are a leading cause of traumatic hand and finger amputations.[5] The correct procedure is to turn off the engine, disengage the clutch and then clear the jam with a broom handle or other long object. In an effort to improve safety, many manufacturers now include a plastic tool to be used to clear jams, often mounted directly to the snow blower.
Most modern machines mitigate this problem by including a safety system known as the "Dead man's switch" (which may be electrical as implied or mechanical in design, such as a lever), to prevent the mechanism from rotating when the operator is not at the controls. In some jurisdictions, this is a mandatory requirement.
History
Robert Carr Harris of Dalhousie, New Brunswick patented a "Railway Screw Snow Excavator" in 1870.[6] In 1923, Robert E. Cole patented a snowplow that operated by using cutters and a fan to blow snow from a surface.[7] Various other innovations also occurred.[8] However, it is Arthur Sicard (1876–1946) who is generally credited as the inventor of the first practical snow blower. In 1925 Sicard completed his first prototype, based on a concept he described in 1894.[9] He founded Sicard Industries in Sainte-Thérèse, Quebec and by 1927 his vehicles were in use removing snow from the roadways of the town of Outremont, now a borough of Montreal. His company is now a division of SMI-Snowblast, Inc. of Watertown, New York.[10]
See also
References
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- ↑ http://www.cracked.com/article_19624_5-absurd-solutions-to-huge-problems-that-actually-worked_p4.html
- ↑ Canadian jet engine used for railroad snow and ice clearing
- ↑ Russian road clearing Klimov VK1 engine
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ http://orthoinfo.aaos.org/fact/thr_report.cfm?Thread_ID=283&topcategory=Injury%20Prevention
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Mario Theriault, Great Maritme Inventions 1833–1950, Goose Lane Editions, 2001, p. 61
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ About Sicard
