Abstract: A bit holder that includes a front portion and a shank axially depending from the front portion. The front portion having an axial length that is less than the axial length of the shank. A combination bit holder and base block that includes the bit holder with the front portion having an axial length that is less than the axial length of the shank. The base block including a mounting portion and a device receiving portion, the device receiving portion including a length that is the same or less than a length of the mounting portion. The base block having a device receiving portion that includes a length shorter than a length of the mounting portion adapted to provide increased access to the rear of the bit assembly allowing the base blocks to be mounted closer to each other for micro-milling operations. Shortened bit holder shanks are reconfigured from prior art to provide increased holding power between the bit holder shank and base block bore.

Abstract: An improved base block is disclosed for use mainly in road milling equipment, but also capable of use in trenching equipment and mining equipment. The base mounting portion is shortened in length from such prior art base blocks and has a reduced length device receiving portion extending therefrom that includes a bore therethrough. Rearwardly of the device receiving portion, the base mounting portion includes a reduced diameter semi-bore or curved wall capable of engaging a portion of the shank side wall of a standard length bit/holder shank. Additionally, an angled slot adjacent the rear of the device receiving bore increases access to the rear to aid removal of a bit/holder therefrom.

Abstract: A bit tip insert on a bit/holder, tool, and/or pick for road milling operations that includes a body including a tip and a base subjacent the tip The bit tip insert also includes at least one heat transfer bore extending from a distal end and/or bottom of the body to a bore termination disposed within the base and/or the tip of the bit tip insert. The at least one bore of the bit tip insert is adapted to allow inward contraction when the overlay transfers heat into the base during operation.

Abstract: An improved diamond coated bit tip insert for a unitary bit/holder, tool, and/or pick for road milling operations that includes a body including a tip and a base subjacent to the tip. The tip of the bit tip insert includes a substrate and an overlay on an outer surface of the substrate. The base of the bit tip insert includes a tapered sidewall or a cylindrical sidewall, the tapered sidewall providing a greater concentration of force applied at an interface of the overlay and the substrate of the tip during a high pressure high temperature (HPHT) process than when using the cylindrical sidewall and the high pressure, high temperature process.

Abstract: Bit holders and combination bit/bit holders with shortened quick change shanks that are selectably retainable in complementary base block bores that are likewise shortened for providing added spacing at the rear of base blocks. When a plurality of such base blocks are mounted in close proximity on a drum or endless chain, the added spacing provides ease of holder replacement and easy access at the rear of the bit holder base block bore.

Abstract: A bit holder having a body that includes a forward end that is diametrically smaller than a lower end and a shank depending axially from the lower end of the body. A substantial portion of the body is substantially solid and the shank is generally cylindrical with a bore axially extending from a distal end of the shank towards the lower end of the body. The bit holder also includes an annular sleeve mounted circumferentially around the upper end of the body and is configured protect the upper end of the body and is configured to receive a bit or insert.

Abstract: An improved diamond coated bit tip insert on a bit/holder, tool, and/or pick for road milling operations that includes a body including a tip and a base subjacent the tip, the tip including an overlay on an outer surface of the tip. The bit tip insert also includes at least one heat transfer bore extending from a distal end and/or bottom of the body to a bore termination adjacent the tip. The at least one bore of the bit tip insert is adapted to allow inward contraction when the overlay transfers heat into the base during operation.

Abstract: A combination bit and bit holder assembly includes a bit holder having a forward body portion and a shank. The forward body portion includes an upper end and a lower end. An insert is mounted in the bore of the upper end of the body portion. The insert also includes a central bore that receivingly retains a receiving cup. The receiving cup includes a bottom portion and an annular flange that extends from the bottom portion and defines a hollow forward portion. A bit is mounted in the hollow forward portion of the receiving cup which is configured to have a ductility that provides impact absorption to the bit.

Abstract: An improved tool is described that has a generally cylindrical slotted shank with a radially bulbous or extending portion adjacent a distal end of the shank, sized to interfere with a bore in which the shank is to be inserted. The dimension of the extending portion can be sized to change the retention force between the shank and the bore as desired. A top of the tool includes a metal carbide-metal disk-metal carbide diamond coated tip sandwich that is bonded inside a bore in the top of the tool.

Abstract: A bit assembly includes a base block and a bit having a forward body portion and a shank. The bit includes a diametrically expanding retainer circumferentially disposed around a shank of the bit adapted to maintain the interference contact between the bit and the base block as the diameter of a bore of the base block increases from use. The bit assembly also includes a sealing gasket that forms a force fit between a washer disposed about the shank of the bit and the base block.

Abstract: A combination bit and bit holder assembly includes a bit holder having a forward body portion and a shank. The forward body portion includes an upper end and a lower end. An insert is mounted in the bore of the upper end of the body portion. The insert also includes a central bore that receivingly retains a receiving cup. The receiving cup includes a bottom portion and an annular flange that extends from the bottom portion and defines a hollow forward portion. A bit is mounted in the hollow forward portion of the receiving cup which is configured to have a ductility that provides impact absorption to the bit.

Abstract: A combination bit and bit holder assembly includes a bit holder having a forward body portion and a shank. The forward body portion includes an upper end and a lower end. An insert is mounted in the bore of the upper end of the body portion. The insert also includes a central bore that receivingly retains a receiving cup. The receiving cup includes a bottom portion and an annular flange that extends from the bottom portion and defines a hollow forward portion. A bit is mounted in the hollow forward portion of the receiving cup which is configured to have a ductility that provides impact absorption to the bit.

Abstract: An improved bit holder includes a larger bit shank bore and an enlarged upper shank segment or band with a taper of up to 7 degrees per side that provides an interference fit between the top of the shank and top of the bit block bore when the bottom of the bit holder body seats on the top of the bit block bore. An annular tapered void adjacent the bit holder tire portion provides for ease of bit holder extraction.

Abstract: An improved diamond coated tip on a bit/holder for road milling operations has a broadened tip base that provides cutting overlap with adjacent bit/holders resulting in a micro milling type surface when utilizing a regular ? inch center-to-center drum.

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.

Abstract: An improved diamond coated tip on a bit/holder for road milling operations has a broadened base that provides cutting overlap with adjacent bit/holders resulting in a micro milling type surface when utilizing a regular ? inch center-to-center drum.

Abstract: A unitary bit/holder assembly includes a reverse taper insert having a diamond coated tip mounted thereon that is received in an annular flange forwardmost portion of a holder body. In a modification, the diamond coated tip is received in a recess on a generally cylindrical forwardmost portion of the holder body.

Abstract: Improved bit holder/bit holder block structure provides increased access to the rear of the assembly allowing bit holder blocks to be mounted closer to each other for micro-milling operations. Shortened bit holder shanks are reconfigured from prior art to provide increased holding power between the bit holder shank and bit holder block bore.

Abstract: Improved bit holder/bit holder block structure provides increased access to the rear of the assembly allowing bit holder blocks to be mounted closer to each other for micro-milling operations. Shortened bit holder shanks are reconfigured from prior art to provide increased holding power between the bit holder shank and bit holder block bore.

Abstract: A bit assembly includes a base block and a bit holder having a forward body portion and a shank. The bit holder includes a diametrically expanding retainer circumferentially disposed around a shank of the bit holder adapted to maintain the interference contact between the bit holder and the base block as the diameter of a bore of the base block increases from use. The bit assembly also includes a sealing gasket that forms a force fit between a washer disposed about the shank of the bit holder and the base block.