Scarifying blade with rotatable bits

Details Scarifying blade with rotatable bits Scarifying blade with rotatable bits

1999-10-22

2001-04-10

Bagnell, David (Department: 3673)

Mining or in situ disintegration of hard material

Hard material disintegrating machines

Floor-working

C404S090000, C037S448000, C037S450000, C172S782000

Reexamination Certificate

active

06213559

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to scarifying blades which are used on road graders or earth moving equipment. More particularly, this invention relates to improvements to the ends of scarifying blades.
BACKGROUND OF THE INVENTION
Road graders are commonly used to grade existing dirt and gravel roads by moving an angled blade along the road in contact with the surface of the road. The blade smooths out the high and low spots in the road. Road graders are also used to cut in new roads.
An improved type of blade, known as a scarifying blade, includes a plurality of rotatable carbide bits along the working edge of the blade. These bits are able to penetrate and fracture hard-packed road surfaces.
One problem that has been observed with the use of existing scarifying blades is that dirt and gravel tend to build up in front of the blade and then spill outwardly around and behind the leading end of the blade. This is a serious disadvantage when using the blade for creating ditches or when trying to pull gravel from areas close to the shoulder of a road. Also, the pockets holding the bits near the end of the blade tend to wear out.
U.S. Pat. No. 4,055,223 describes a corner tooth assembly for an earth moving implement. U.S. Pat. No. 4,883,129 describes a bit assembly having a carbide insert. U.S. Pat. No. 2,840,934 describes a removable tooth for mounting on a blade. U.S. Pat. Nos. 4,047,312 and 3,638,736 describe a corner tooth assembly for earth moving equipment or dozer blade. U.S. Pat. Nos. 2,965,989, 3,289,331, 3,456,370 and 3,465,833 describe end bits for dozer blades. U.S. Pat. No. 2,831,275 describes a reversible bit for a scraper bowl edge. U.S. Pat. No. 5,377,766 describes an angled blade attachment for a loader bucket. U.S. Pat. No. 4,741,116 describes a wing assembly for a snowplow. U.S. Pat. No. 4,753,299 describes a grader blade having a plurality of spaced picks located in sockets along the lower edge of the support frame.
There has not heretofore been provided a scarifying blade having the features and advantages provided by the present invention.
SUMMARY OF THE INVENTION
In accordance with the present invention there is provided an improved scarifying blade for use on earthmoving equipment and having a lower working edge, two ends, and a plurality of spaced bits attached to the working edge. Attached to at least one end (and preferably to both ends) there is a rotatable end bit having a longitudinal axis which forms an angle in the range of about 30 to 60 degrees relative to the longitudinal axis of the spaced bits. Preferably, there is also a generally vertical plate extending upwardly from each end bit. The plate forms an angle with the spaced bits which is the same as the angle between the end bit and the spaced bits. This would be the same angle as that formed between the plate and a line which is perpendicular to the front of the blade.
With the angled end bit on the blade, the blade is very useful in situations where it is necessary to create ditches or move gravel from road shoulders. The angled end bit is effective in loosening dirt, gravel, rocks, etc. and directing the loosened material toward the front of the blade instead of letting it fall outwardly around the end of the blade. The angled end bit also protects the end of the blade from excessive wear.
Other features and advantages of the improved blade of this invention will be apparent from the following detailed description and the accompanying drawings.


REFERENCES:
patent: 2727319 (1955-12-01), Evans
patent: 4784517 (1988-11-01), Bergqvist et al.

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