2015

New Brunswick when Robert T. Mawhinney attached a dump box to a flat bed truck in 1920. The lifting device was a winch attached to a cable that fed over sheave (pulley) mounted on a mast behind the cab. The cable was connected to the lower front end of the wooden dump box which was attached by a pivot at the back of the truck frame. The operator turned a crank to raise and lower the box. The first dump bed apparatus on a wheeled vehicle patented in Canada.

.

In general, a tractor is a piece of heavy machinery that is designed to carry out some type of work. The type of work this equipment can do depends on its size, the type of attachments it has or can support, and the type of tasks it is designed to accomplish. Technically, a tractor can be the engine of a tractor-trailer truck, but more commonly, they are known as personal mowers or those that are used for agricultural purposes. These machines are also used in excavation, in manufacturing and industry or on construction sites.

For personal residential use, a tractor can be a general piece of equipment that can perform a variety of home maintenance tasks. A person can use one for mowing in the summer, landscaping projects, and plowing in the winter. Tractors are also good for hauling materials from one area of lawn to another because their tires are specially designed to not tear up grass and concrete as badly as excavating equipment tends to do.

A personal tractor is usually small to mid-size, powered by a 20 to 80 horsepower engine. The largest used for heavy work can have as high as 200 horsepower engines. Horsepower is the biggest factor in differentiating between the different types of tractors. Their engines are typically powered by either unleaded or diesel fuel, though some can run on grain.

Another key determining factor for a tractor is its versatility regarding attachments and which ones it is able to support. The more options for connecting attachments to the machine, the higher the cost will be. In addition, the engine's horsepower must be considered in regards to which attachments will work efficiently. The most common tractor attachments include front end loaders, mowers, box blades, spreaders, tillers, plows, trail-

122

ers and backhoes. Most attachments are interchangeable so they can be

used with different machines.

IЧ КННТЭТШЧ ЭШ ЭСО ЭrКМЭШrs’ ТЧvКХЮКЛХО аШrФ, ЭСОrО КrО ЦКЧв ОЧЭСЮsТКsЭs who collect and restore antique tractors, participate in clubs, and hobbyists who collect or build models. Many people even use their machines to participate in recreational sports such as tractor races and tractor pulling.

http://www.wisegeek.com/what-is-a-tractor.htm

123

1.http://www.multitran.ru

2.http://en.wikipedia.org/wiki/Main_Page

4.http://www.wisegeek.com/what-is-a-bush-hammer.htm

5.http://www.wisegeek.org/what-is-a-trowel.htm

6.http://www.wisegeek.com/what-is-a-ceramic-tile-cutter.htm

7.http://www.ehow.co.uk/list_6623615_cheap-plastering-tools.html

8.http://www.thediyschool.co.uk/plastering-course-notes-spot-board

9.http://www.glacierboats.com/tongass/waterlevel.html

10.http://www.wisegeek.com/what-is-a-grapple-truck.htm

11.http://www.wisegeek.com/what-are-pumping-stations.htm

12.http://www.wisegeek.com/what-is-a-conveyor.htm

13.http://www.wisegeek.com/what-is-a-winch.htm

14.http://www.wisegeek.com/what-are-the-different-methods-of-land-clearing.htm

15.http://www.wisegeek.com/what-are-the-different-types-of-earth-moving- equipment.htm

16.http://www.wisegeek.com/what-is-a-trencher.htm

17.http://www.wisegeek.org/what-are-the-different-types-of-cranes.htm

18.http://www.wisegeek.com/what-is-heavy-equipment.htm

19.http://www.wisegeek.com/what-is-a-car-hoist.htm

20.http://www.tramacbymontabert.com/technology

21.http://www.wisegeek.org/what-does-a-truck-driver-do.htm

22.http://www.wisegeek.com/what-the-different-parts-of-a-fire-truck.htm

23.http://www.wisegeek.com/what-is-a-tractor.htm

124

125

126

127

У

SPECIAL-PURPOSE MACHINERY

AND TOOLS

-

***

,

644080, . , . , 5

128