# US 9,039,099 B2 · Combination polycrystalline diamond bit and bit holder

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- Number: US 9,039,099 B2
- Document ID: US9039099B2
- Status: Granted
- Kind: B2
- Application number: 13/801,012
- Filed: 2013-03-13
- Published: 2014-04-24
- Granted: 2015-05-26
- Earliest claimed: 2012-10-19
- Applicants: Phillip Sollami
- Inventors: Phillip Sollami
- Web page: https://patentgrep.com/patent/US9039099B2

## CPC

- E21C 35/183: with inserts or layers of wear-resisting material {(drill bits with wear-resistant parts E21B10/46)}
- B28D 1/188: {with exchangeable cutter bits or cutter segments}
- E21C 35/18: Mining picks; Holders therefor (planing knives E21C27/44)
- E21C 35/19: Means for fixing picks or holders
- E21C 35/197: using sleeves, rings or the like, as main fixing elements
- E21C 35/1831: {Fixing methods or devices}
- E21C: MINING OR QUARRYING
- B28D: WORKING STONE OR STONE-LIKE MATERIALS

## 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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

The bit/bit holder as defined in claim 1 wherein said PCD coated bit has a flat top surface.

### Claim 3 (depends on 1)

The bit/bit holder as defined in claim 1 wherein said PCD coated bit has a generally conical top surface.

### Claim 4 (depends on 1)

The bit/bit holder as defined in claim 1 wherein said insert includes an annular tungsten carbide ring surrounding said bore.

### Claim 5 (depends on 1)

The bit/bit holder as defined in claim 1 wherein said insert is made of steel having a ductility to provide an impact absorbing member adjacent said PCD coated tip.

### Claim 6 (depends on 1)

The bit/bit holder as defined in claim 1 wherein said upper end of said body further includes an annular generally frustoconical ring of tungsten carbide surrounding the outside thereof.