Earth working – Tool – standard or connection – With add-on cutting or wearing element applied directly...
Reexamination Certificate
2005-02-15
2005-02-15
Batson, Victor (Department: 3671)
Earth working
Tool, standard or connection
With add-on cutting or wearing element applied directly...
C172S747000, C172S701100, C037S446000, C037S460000
Reexamination Certificate
active
06854527
ABSTRACT:
The present invention provides for carbide edge snowplow and grader blades that are durable and fracture resistant. The carbide along the blade edge and blade bottom which contacts the surface being treated is designed to limit the degree of fracture of the carbide. Carbide inserts along the edge and/or bottom are separated from each other by a steel alloy spacer/shim along the width of the blade. The spacer/shim reduces the potential for impact damage cracks that form in a carbide insert from propagating into adjacent inserts along the width of the blade. In one embodiment, the improved blade edge comprises an edge body having a lower edge with a recess and separate slot in the bottom surface of the edge. Within the blade recess and blade slot are positioned carbide block/bar inserts separated by spacer means made from a ductile material.
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Baldwin Charles P.
Manway Terry A.
Mayer Andrew G.
Statler Daniel C.
Batson Victor
Kennametal Inc.
Smith Matthew W.
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