Cutter bit having hard tip with middle section defined by...

Details Cutter bit having hard tip with middle section defined by... Cutter bit having hard tip with middle section defined by...

E - Fixed Constructions

02

F

262/83

E02F 3/24 (2006.01) E02F 9/28 (2006.01)

Patent

CA 1279336

ABSTRACT OF THE DISCLOSURE A cutter bit hard tip (62) has an outer tip section (76), an inner flange section (78) , and a middle section (80) disposed between and merging at its opposite ends with the tip and flange sections and being defined by a continuous concave surface of revolution (82). The tip, flange and middle sections lie along a common longitudinal central axis (84). The tip section has a rounded-off end, and a frusto-conical surface of revolution (88) merging from the end. The flange section has a right cylindrical surface whose diameter is greater than the maximum diameter of the tip section. The middle section has a maximum diameter less than or equal to the diameter of the flange section and a minimum diameter substantially equal to the maximum diameter of the tip section. The concave surface of revolution of the middle section in profile has an outwardly and downwardly sloping configuration generally similar to that of the sides of a hell-shaped curve.

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