Hammer element on a degradation pick
View Patent ↗A body of a degradation pick may comprise a substantially conical frustum. A hammer element may be integrally formed with the substantially conical frustum and extend there from in one radial direction. A shank may protrude from the body opposite a narrow end of the substantially conical frustum.
1. A degradation pick, comprising:
a body comprising a hammer element integral with and extending from a substantially conical frustum in one radial direction;
a shank protruding from the body opposite a narrow end of the substantially conical frustum;
a super hard cutting element disposed on the narrow end of the substantially conical frustum; and
a block attached to an exterior of a rotatable drum, wherein the shank is disposed within a hole in the block;
wherein the hammer element comprises an impact face generally parallel to a tangent of the rotatable drum; a front face generally normal to the rotatable drum and facing in a direction of rotation of the rotatable drum; and first and second side faces generally normal to the rotatable drum and facing in opposite directions axially along the rotatable drum;
wherein the impact face rises from the first and second side faces to form a ridge extending from the front face to the substantially conical frustum.
2. The degradation pick of claim 1 , wherein the hammer element and substantially conical frustum are formed of the same material.
3. The degradation pick of claim 1 , wherein hardfacing material is disposed on an exterior surface of the hammer element.
4. The degradation pick of claim 1 , wherein an exterior surface of the hammer element is covered with a hard surface coating.
5. The degradation pick of claim 1 , wherein a radius of curvature of the impact face at the ridge is greater than 1.00 inch (25.4 mm).
6. The degradation pick of claim 1 , wherein an angle between the ridge and a tapered sidewall of the substantially conical frustum is between 100 and 180 degrees.
7. The degradation pick of claim 1 , further comprising a continuous transition between the hammer element and the substantially conical frustum.
8. The degradation pick of claim 7 , wherein the continuous transition comprises a radius of curvature greater than 0.25 inches (6.35 mm).
9. The degradation pick of claim 1 , wherein the substantially conical frustum comprises a tapered sidewall adjacent the narrow end and a constant sidewall adjacent an opposing broad end.
10. The degradation pick of claim 9 , wherein a cross-sectional area of the broad end is at least 4 times as large as a cross-sectional area of the narrow end.
11. The degradation pick of claim 1 , wherein a volume of the hammer element is between 10 and 20% of a volume of the body.
12. The degradation pick of claim 1 , wherein the shank is offset from a central axis of the substantially conical frustum by an angle between 15 and 25 degrees.
13. The degradation pick of claim 1 , wherein the hammer element, substantially conical frustum, and shank are formed of the same material.
14. The degradation pick of claim 1 , wherein the hammer element, substantially conical frustum, and shank are cast together.