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Blade

Bulldozer blade

Komatsu bulldozer pushing up to 7m³ with semi-U tilt dozer

The bulldozer blade is a heavy metal plate on the front of the tractor, used to push objects, and shove sand, soil, debris, and sometimes snow. Dozer blades usually come in three varieties:

1. A straight blade (“S blade”) which is short and has no lateral curve and no side wings and can be used for fine grading.
2. A universal blade (“U blade”) which is tall and very curved, and has large side wings to carry more material.
3. An “S-U” (semi-U) combination blade which is shorter, has less curvature, and smaller side wings. This blade is typically used for pushing piles of large rocks, such as at a quarry.

Blades can be fitted straight across the frame, or at an angle, sometimes using additional ’tilt cylinders’ to vary the angle while moving. The bottom edge of the blade can be sharpened, e.g. to cut tree stumps.

Sometimes a bulldozer is used to push another piece of earth moving equipment known as a “scraper“. The towed Fresno Scraper, invented in 1883 by James Porteous, was the first design to enable this to be done economically, removing the soil from the cut and depositing it elsewhere on shallow ground (fill). Many dozer blades have a reinforced center section with this purpose in mind, and are called “bull blades”.

In military use, dozer blades are fixed on combat engineering vehicles and can optionally be fitted on other vehicles, such as artillery tractors such as the Type 73 or M8 Tractor. Dozer blades can also be mounted on main battle tanks, where it can be used to clear antitank obstacles, mines, and dig improvised shelters. Combat applications for dozer blades include clearing battlefield obstacles and preparing fire positions.^[1]

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