Resilent Connection between a Pick Shank and Block
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 assembly comprising:
a pick shank configured to be press fit directly within a bore of a block of a driving mechanism;
the pick comprising a head opposite the shank;
the shank comprising an outside surface;
the shank also comprising a tapered region on the outside surface;
the tapered shank region is configured to abut a tapered region on an inner surface of the bore;
wherein the tapered regions are configured to be complementary; and
the shank also comprising at least one substantially annular spring clip disposed about the outside surface of the shank.
2 . The assembly of claim 1 , wherein the spring clip is configured to collapse upon insertion into the bore.
3 . The assembly of claim 1 , wherein the spring clip is configured to decrease in diameter when inserted into the bore.
4 . The assembly of claim 1 , wherein the spring clip is disposed at a distal end of the pick shank.
5 . The assembly of claim 1 , wherein the spring clip comprises a larger diameter than the bore of the block.
6 . The assembly of claim 1 , wherein the spring clip comprises a larger diameter than the outside surface of the pick shank.
7 . The assembly of claim 1 , wherein the spring clips is configured to axially secure the pick within the bore.
8 . The assembly of claim 1 , wherein the interference of the press fit is configured to prevent rotation of the pick shank with respect to the bore.
9 . The assembly of claim 1 , wherein the pick shank comprises a proximal thickness and a distal thickness along a length of the shank.
10 . The assembly of claim 9 , wherein the distal thickness is configured to be thinner than the proximal thickness.
11 . The assembly of claim 9 , wherein the spring clip is configured to be concentric with the distal thickness.
12 . The assembly of claim 9 , wherein the proximal thickness is disposed forward of the spring clip and is configured to prevent rotation of the shank within the bore at a proximal end of the shank.
13 . The assembly of claim 9 , wherein the distal thickness is configured to decrease surface contact between the outside surface of the pick shank and the inner surface of the bore.
14 . The assembly of claim 9 , wherein the distal thickness is configured to decrease friction between the outside surface of the pick shank and the inner surface of the bore.
15 . The assembly of claim 1 , wherein the pick comprises at least one longitudinal recess extending towards the pick head along the shank from a distal end of the shank.
16 . The assembly of claim 1 , wherein the pick shank is hollow.
17 . The assembly of claim 1 , wherein the head of the pick comprises a cemented metal carbide substrate bonded to sintered polycrystalline diamond.
18 . The assembly of claim 17 , wherein the substrate is bonded to a bolster and the bolster is brazed to a body of the pick, wherein the at least one void is formed at a non-planar interface between the bolster and the body.
19 . The assembly of claim 18 , wherein the non-planar interface is configured to prevent residual thermal stress formation.
20 . The assembly of claim 1 , wherein the block is configured to attach to a rotary degradation drum, chain, saw, bucket, plow, excavator, or combination thereof.