Boring or penetrating the earth – Bit or bit element – With helical-conveying portion
Patent
1982-09-30
1985-03-12
Purser, Ernest R.
Boring or penetrating the earth
Bit or bit element
With helical-conveying portion
175410, 175415, E21B 1044
Patent
active
045039208
ABSTRACT:
An improved bit for use in drilling masonry and the like. This bit is of the type having a transverse bar of hardened material in the tip thereof with symmetrical end surfaces sloping away from a central chisel edge located on the axis of the bit. One of these surfaces is provided along its length with a groove extending from a cutting lip to the trailing edge, with the groove width and depth at the trailing edge having at least the same dimensions as at the cutting edge. Preferably the dimensions at the trailing edge are slightly greater than those at the cutting edge. The second of the surfaces has an outer portion with a reduced angle with respect to the axis of the bit as compared to the angle of the inner portion. This construction provides for the accurate drilling of holes in masonry and the like and further accomplishes the drilling at increased penetration rates with the same or lower axial force applied to the bit.
REFERENCES:
patent: 1144088 (1915-06-01), Ains
patent: 2673714 (1954-03-01), Hargrave
patent: 3674101 (1972-07-01), Chromy
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