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US 9,039,099 B2Granted
Combination polycrystalline diamond bit and bit holder
OwnerPhillip Sollamiinventor
Life of this patent
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Abstract
A quick change type bit/bit holder includes several different structures for holding the item in a bit block without the necessity of a fastener. The bit portion of the bit/bit holder combination includes a ductile steel insert with a polycrystalline diamond coated tungsten carbide bit positioned therein. The ductility of the steel insert acts as a shock absorber to allow the bit to successfully remove concrete as well as asphalt in a road milling machine.
Claims6
A bit/bit holder for road milling machinery comprising:
- a body of rounded shape having an upper end diametrically smaller than a lower end thereof, said body being solid in a substantial portion thereof,
- a generally cylindrical shank extending from said lower end of said body, said shank being hollow and including at least one axially oriented elongate slot through a side wall of said shank,
- said upper end of said body including a bore extending axially therein, an insert retained in said bore forming a unitary structure with said body, said insert including a polycrystalline coated distal tip
- said bore extending axially in said upper end of said body includes an annular declining taper side wall, said insert having a complementary declining taper side wall for matingly fitting therein,
- a top of said insert extending outwardly of said bore in said upper end of said body and including a central cylindrical bore therein, and a PCD coated bit receivingly retained in said central bore.
2 more elements
Dependencies are inferred from the claim text.