A cutting device of a self-centering cutter holder is disclosed. The cutting device includes a cutter holder with a main body and a base body. A cutter mounting part and an extension handle part are separately arranged at upper and lower parts of the main body; the extension handle part is at least partially connected to a pressing surface at the lower side of the main body and is provided with a supporting surface and a central axis, around which a surface plain line of the supporting surface forms an angle. The cutter holder is mounted in a containing part of the base body through the extension handle part, and can independently generate fastening force to fix the cutter holder and the base body together, so that the whole cutting device is greatly improved in reliability and is greatly prolonged in service life, and the production cost is reduced.

The invention relates to a bit holder for an earth working machine, in particular a road milling machine, that comprises a bit receptacle in the region of a working side of a support member and that indirectly or directly carries an insertion projection on an insertion projection side of the support member, the support member comprising two stripping surfaces [first or second stripping surfaces] that form a stripping surface pair and are at an angle to one another. In order to achieve a stable and long-lived configuration with such a bit holder, provision is made according to the present invention that the support member comprises at least one further stripping surface that is at an angle to the two stripping surfaces of the stripping surface pair.

The present invention belongs to the technical field of milling machines, and mainly relates to a novel cutter holder and base system for a milling machine. The cutter holder and base system according to the present invention aims to solve the problems in the prior art that a cutter holder structure is unreasonable, the cutting force of a cutter cannot be well dispersed in the cutter holder and a base, so that the service lives of the cutter holder and the base are shortened. The base is provided with a hole-shaped inner area and two curved surface areas, where the two curved surface areas are disposed in a circumferential area of the hole-shaped inner area, the curved surface areas are arranged at an angle, and each curved surface area includes two curved surfaces. The cutter holder improves its own usage performance while a lighter weight is achieved.

A cutting tool holding device, which is for holding a cutting tool, includes a base, a holder, and a limiting set, wherein the holder is disposed on the base, and the limiting set is disposed in a non-circular channel of the base. A connecting shaft portion of the holder is for inserting into a storage hole of the base, wherein the connecting shaft portion includes a shaft body and at least one positioning portion, and the non-circular channel includes an abutting member and a bolt. The bolt is passed through the abutting member, wherein the abutting member is moved to an opening hole of the storage hole along an axis by rotating the bolt so as to push the positioning portion and abut the shaft body.

A cutting tooth system includes a plurality of substrates, each having a base for attaching to the cutting wheel, and an outer surface opposite the base. A plurality of tooth pockets are integrally formed in the substrate, each tooth pocket having a tooth receiving aperture extending through the outer surface and into the substrate. A cutting tooth has a pocket engagement portion configured for being received in a mounting pocket. The pocket engagement portion defines a pocket engagement length and a shank defining a shank diameter. A cutter portion extends from the pocket engagement portion.

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.

A mounting assembly adapted for attachment to a surface of a rotatable driving member of a cutting tool machine and adapted for receiving a cutting tool includes: a base having a bottom portion for attachment to the surface of the rotatable driving member and a front portion that defines a bore; and a tool holder configured for mounting to the base. The tool holder includes: a leading head region having a forward face that defines an aperture for receiving the cutting tool; a trailing shank region with a central longitudinal axis and having an axial forward end and an axial rearward end; and a mediate region intermediate of and contiguous with the leading head region and the trailing shank region. The trailing shank region includes an anti-rotation portion and a mounting retention portion.

The invention relates to a tool device for a ground milling machine, particularly a road milling machine, a recycler, a stabilizer or a surface miner. The tool device comprises a milling chisel with a highly wear-resistant chisel tip, particularly comprising PCD material, and a chisel shaft extending along a longitudinal axis, and a chisel holder with a shaft receptacle, the chisel shaft of the milling chisel having at least one tapering section narrowing in a direction away from the chisel tip. Furthermore, a fastening device is provided, which is designed in such a way that it pulls the milling chisel along its longitudinal axis and in the direction away from the chisel tip into the shaft receptacle, the shaft receptacle of the chisel holder being designed complementary to the chisel shaft of the milling chisel in such a way that the tapering section, when braced by the fastening device, bears against the chisel holder in the shaft receptacle in a frictionally locking manner shaft receptacle. The chisel holder also comprises a base holder and a quick-change chisel holder, the base holder comprising a holder receptacle for receiving the quick-change chisel holder, and the quick-change chisel holder comprising the shaft receptacle, and the fastening device being designed in such a way that it pulls both the milling chisel along its longitudinal axis and in the direction away from the chisel tip into the shaft receptacle as well as the quick-change chisel holder into the holder receptacle in the base holder. The invention also relates to a milling chisel and a quick-change chisel holder for such a tool device and a ground milling machine with such a tool device.

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.

A cutting tool holding device includes a base, a cutting tool holder, a screw element, a fitting positioning element and a pulling element. The base includes an accommodating groove, a receiving hole and a fitting positioning hole. The cutting tool holder includes a holder and a cutting tool receiving component. The holder includes an engaging portion detachably engaged in the accommodating groove, and a concave portion communicated with the fitting positioning hole is formed on the engaging portion. The fitting positioning element is driven by the pulling element to move in the fitting positioning hole for pressing against the concave portion tightly.