Resilient connection between a pick shank and block
View Patent ↗In one aspect of the present invention, a pick assembly is configured that comprises a pick shank configured to be press fit directly within a bore of a block. The pick shank comprises an inside and outside surface. The pick comprises a pick head opposite the shank. The shank comprises at least one longitudinal recess extending towards the pick head along the shank from a distal end of the shank. The recess allows the shank to resiliently collapse upon insertion into the bore while maintaining a press fit between the bore and the shank.
1. A pick comprising:
a shank configured to be press fit directly within a bore of a block;
the shank comprising an inside and an outside surface;
a head opposite the shank;
the shank also comprising at least one longitudinal recess extending towards the head along the shank from a distal end of the shank;
wherein the recess allows the shank to resiliently collapse upon insertion into the bore while maintaining a press fit between the bore and the shank; and
wherein the at least one recess comprises a first and second recess wall connected by a spring formed in a material of the shank.
2. The pick of claim 1 , wherein the at least one recess is formed on the inside surface of the shank.
3. The pick of claim 1 , wherein the at least one recess is formed on the outside surface of the shank.
4. The pick of claim 1 , wherein the outside surface is continuous.
5. The pick of claim 1 , wherein the inside surface is continuous.
6. The pick of claim 1 , wherein the at least one recess is formed through part of a thickness between the inside and outside surfaces.
7. The pick of claim 1 , wherein the at least one recess is configured to relieve tension between the shank and the bore.
8. The pick of claim 1 , wherein the shank comprises a first thickness and a second thickness along the length of the shank.
9. The pick of claim 8 , wherein the first and second thicknesses are configured to secure the shank within the bore at a proximal end and the distal end of the shank.
10. The pick of claim 8 , wherein the first and second thicknesses are configured to increase the compliancy of the shank.
11. The pick of claim 1 , wherein the shank comprises a tapered region on the outside surface that is configured to abut a tapered region on an inner surface of the bore, wherein the tapered regions are complementary.
12. The pick of claim 1 , wherein the shank is hollow.
13. The pick of claim 1 , wherein the head comprises a cemented metal carbide substrate bonded to sintered polycrystalline diamond.
14. The pick of claim 13 , wherein the substrate is bonded to a bolster and the bolster is brazed to a body of the pick, wherein at least one void is formed along a non-planar interface between the bolster and the body.
15. The pick of claim 14 , wherein the non-planar interface is configured to prevent residual thermal stress formation.
16. The pick of claim 1 , wherein the shank is substantially stationary with respect to the bore.