Retention system
View Patent ↗A retention assembly, comprises a carbide bolster comprising a cavity formed in its base end. A shaft comprises an inserted end disposed within the cavity. The shaft is disposed within a hollow shank which comprises a first end contacting the bolster and a loaded end in mechanical communication with the shaft. The inserted end is interlocked to an inner surface of the cavity through a casting.
1. A retention assembly, comprising:
a carbide bolster having a base end, the base end including a cavity formed therein;
a shank including a first end, a loaded end, and a bore extending from said first end to said loaded end, said first end being in contact with said carbide bolster;
a shaft disposed within said bore including an inserted end disposed within said cavity and an other end in mechanical communication with said loaded end; and
a cast material disposed within said cavity, said cast material interlocking said inserted end within said cavity.
2. The retention assembly of claim 1 , wherein said cast material is selected from the group consisting of zinc, aluminum, magnesium, thermosetting plastics, melamine resin, polyester resin polyimide, or vulcanized rubber.
3. The retention assembly of claim 1 , further comprising a nut having threads, wherein said shaft includes a threaded connector at said other end, said threaded connector being in mechanical communication with said loaded end by way of said threaded nut.
4. The retention assembly of claim 3 , wherein said threaded nut engages a shoulder of said loaded end of said shank.
5. The retention assembly of claim 1 , wherein said inserted end of said shaft includes a tapered surface.
6. The retention assembly of claim 1 , wherein said inserted end of said shaft includes a first diameter and a second diameter larger than said first diameter.
7. The retention assembly of claim 1 , wherein said shaft, said carbide bolster, and said shank are coaxial.
8. The retention assembly of claim 1 , wherein said inserted end of said shaft comprises at least one groove formed in a surface of said inserted end of said shaft.
9. The retention assembly of claim 1 , wherein said retention assembly is incorporated into a tool selected from the group consisting of picks, drill bits, hammer mills, shear bits, and cone crushers.
10. The retention assembly of claim 1 , wherein said inserted end of said shaft comprises a shaft geometry adapted to interlock with said cast material.
11. The retention assembly of claim 1 , wherein an inner surface of said cavity of the carbide bolster comprises a cavity geometry adapted to interlock with said cast material.
12. The retention assembly of claim 1 , wherein said cavity geometry comprises a tapered cavity surface that narrows towards an opening of the cavity formed in the base end.
13. The retention assembly of claim 12 , wherein a diameter of the opening of said cavity formed in said base end is smaller than a diameter of said inserted end of said shaft.
14. The retention assembly of claim 1 , wherein said carbide bolster further comprises a first segment and a second segment, wherein a portion of said cavity is formed in said first segment and another portion of said cavity is formed in said second segment.
15. The retention assembly of claim 1 , wherein said inserted end of said shaft is in contact with said cavity of said carbide bolster.
16. The retention assembly of claim 1 , further comprising a tip of carbide and diamond, said tip being brazed to said carbide bolster.
17. The retention assembly of claim 1 , wherein the said retention assembly is incorporated into an item selected from the group consisting of a driving mechanism, a drum, a chain, and a rotor.
18. The retention assembly of claim 1 , wherein inserted end of said shaft includes a tapered end, said cast material surrounding the entire tapered end of said shaft.
19. The retention assembly of claim 1 , wherein said cast material and said carbide bolster are not significantly bonded to one another.
20. The retention assembly of claim 1 , wherein said casting material and said first end do not have a strong bond.
21. A retention assembly for retaining a bolster to a shank, comprising:
a bolster having a base end, the base end including a cavity formed therein;
a shank including a first shank end, a second shank end, and a bore extending from said first shank end to said second shank end, said first shank end being adjacent to said bolster;
a shaft disposed within said bore, said shaft including a first shaft end disposed within said cavity and a second shaft end in mechanical communication with said second shank end; and
a cast material disposed within said cavity, said cast material retaining said first shaft end within said cavity.