Abstract: A quick change type bit holder for use in a bit assembly for road milling, road planing, trenching and mining equipment wherein a bit shank extends completely through an axially oriented bit holder bore includes a slotted shank having an outwardly tapered bit holder bore wherein insertion of the bit shank in a bit block acts to slightly collapse the shank which collapses the tapered bore to a generally cylindrical configuration that preferably snugly retains the bit shank rotatably therein.

Abstract: A quick-change tool holder has an enlarged forward end, a rearwardly extending shank, and an axial bore extending through the enlarged forward end and the shank with the bore having a diameter sized to receive the shank of a cutting tool. A second blind hole extends into the side surface of the enlarged forward end. An extraction device, such as the shank of a worn tool, is inserted into the blind hole. Where the extraction device is a worn tool, the cutting end of the tool is hit with a hammer to remove the tool from a base block mounting.

Abstract: A rotatable tool has a tool body that is generally symmetrical about a longitudinal axis, an enlarged cutting head, and a rearwardly extending shank. The shank joins the enlarged cutting head at an annular flange. A compressible sleeve is fitted around the shank and a wear ring is around the shank at the forward end of the sleeve. A disc spring is positioned between the radial flange and the sleeve to remove axial play between the shank and the sleeve and to seal the parts so that hard particles cannot enter and interfere with rotation of the tool.

Abstract: A retraction tool for removing the shank of a tool holder from a base block mounting includes an elongate threaded member having a hook threaded on one end thereof. The hook has a hook end for holding to the forward end of a tool holder. A hammer moveable along the length of the elongate member impacts against said stop for pulling said tool holder from said base block mounting.

Abstract: A device for extracting a tool holder from a base block mounting has a front plate and a pair of rearwardly extending arms contacting the base block mounting. An extraction nut has at least two parallel threaded holes therein. A threaded stud is threaded into one of the threaded holes and the length extends through a hole in the front plate and through the tool holder and is retained by a nut. An extraction bolt is threaded through the second threaded hole of the extraction nut with the distal end engaging the front plate.

Abstract: A rotatable tool has a tool body that is generally symmetrical about a longitudinal axis, an enlarged cutting head, and a rearwardly extending shank. The shank joins the enlarged cutting head at an annular flange having an annular inner portion contiguous with the forward end of the shank and an annular outer portion contiguous with the outer circumference of the enlarged cutting head. The annular flange is not planar. Instead, the annular inner portion of the flange is positioned axially forward of the annular outer portion.

Abstract: A quick change type bit holder for use in a bit assembly for road milling, road planing, trenching and mining equipment wherein a bit shank extends completely through an axially oriented bit holder bore includes a slotted shank having an outwardly tapered bit holder bore wherein insertion of the bit shank in a bit block acts to slightly collapse the shank which collapses the tapered bore to a generally cylindrical configuration that preferably snugly retains the bit shank rotatably therein.

Abstract: A compressible sleeve for fitting around the shank of a rotatable tool has a cut out portion at the forward end thereof. The sleeve is compressed to a diameter less than the inner diameter of the bore of a tool holder by an annular wear ring having an inwardly directed projection that retains the cylindrical sleeve to a diameter that is less than the diameter of the bore of the tool holder. When the shank of the tool is driven into the bore of the tool holder, the wear ring is forced forwardly along the sleeve until the projection falls in the cut out portion of the sleeve allowing the sleeve to expand to the diameter of the bore of the tool holder and locking the wear ring from rotating with the tool.

Abstract: An assembly machine for assembling a rotatable tool has a frame with a base. A retainer on the base holds a blank tool body with the cylindrical shank thereof extending upwardly. A motor assembly at the upper end of the frame moves a cylindrical assembly member axially downwardly and a tubular lower end of the assembly member forces as annular wear ring around a compressible sleeve on the shank of the tool.

Abstract: A retraction tool for removing the shank of a tool holder from a base block mounting includes an elongate threaded member having a hook threaded on one end thereof. The hook has a hook end for holding to the forward end of a tool holder. A hammer moveable along the length of the elongate member impacts against said stop for pulling said tool holder from said base block mounting.

Abstract: The cylindrical shank of a rotatable tool is retained in the cylindrical bore of a tool holder by a retainer that engages an annular groove on a portion of the shank of the tool that extends outward of the rear surface of the tool holder. The tool has an axial bore in the distal end of the shank. The retainer has a pair of spaced ridges that engage the annular groove on the shank and a panel that extends across the distal end of the shank. The retainer is held in place by a pin extending through the panel and into the bore in the distal end of the shank.

Abstract: A quick-change tool holder has an enlarged forward end, a rearwardly extending shank, and an axial bore extending through the enlarged forward end and the shank with the bore having a diameter sized to receive the shank of a cutting tool. A second hole extends into the side surface of the enlarged forward end intersecting the axial bore. The shank of a tool of the type received in the axial bore is inserted into the second hole and the cutting end of the tool is hit with a hammer to remove the tool from a base block mounting.

Abstract: The cylindrical shank of a rotatable tool is retained in the cylindrical bore of a tool holder by a retainer that engages an annular groove on a portion of the shank of the tool that extends outward of the rear surface of the tool holder. The tool has an axial bore in the distal end of the shank. The retainer has a pair of spaced ridges that engage the annular groove on the shank and a panel that extends across the distal end of the shank. The retainer is held in place by a pin extending through the panel and into the bore in the distal end of the shank.

Abstract: A compressible sleeve for fitting around the shank of a rotatable tool has a cut out portion at the forward end thereof. The sleeve is compressed to a diameter less than the inner diameter of the bore of a tool holder by an annular wear ring having a generally cylindrical central opening with a diameter larger than the diameter of the bore of the tool holder, but having an inwardly directed projection that retains the cylindrical sleeve in a diameter that is less than the diameter of the bore of the tool holder. When the shank of the tool is subsequently driven into the bore of the tool holder, the wear ring is forced forwardly along the sleeve until the projection of the wear ring falls between the cut out portions of the sleeve thereby allowing the sleeve to expand to the diameter of the bore of the tool holder. The outer walls of the cut out portion of the sleeve engage the ends of the inwardly directed projection of the wear ring thereby preventing the wear ring from rotating with the tool.

Abstract: A tool has a tapered forward cutting end behind which is a cylindrical shank. A rearwardly facing annular flange separates the forward cutting end from the shank. The shank is received in a tool holder having a planar forward surface, and fitted around the shank of the tool and resting on the forward surface of the tool holder is an annular wear ring. The wear ring has a small outer diameter portion that is less than the outer diameter of the radial flange and less than the diameter of the forward end of the tool holder, thereby allowing a gap between those parts to receive an extraction tool. The wear ring also has a large outer diameter portion at least equal to the diameter of the forward surface of the tool holder.

Abstract: A rotatable tool has a cylindrical shank and a compressible sleeve fitted thereon to retain the shank in the bore of a tool holder. A wear ring is positioned behind the forward cutting end of the tool and against the forward surface of the tool holder. The compressible sleeve is locked to the wear ring to prevent rotation of the wear ring with the tool. Also, the outer diameter of the wear ring is greater than the width of the forward surface of the tool holder forming an overhang, and a second tool can then be used to engage the overhang to remove the tool from the tool holder.

Abstract: A drill bit consists of a bit body having a forward end and a slot in the forward end to hold a hardened cutting blade. The bit body has a table near the center of the blade to reduce the speed at which the drill bores into hard material. The blade has a central slot extending into the forward end thereof such that the slot defines inner side walls and a bridge extending between the inner side walls. The bridge has sloping sides the define a central cutting edge so as to cut particles of hard material accumulating in the slot. The inner side walls intersect the leading faces of the blade and form cutting edges which further cut particles loosened at the center of the cut. Also, relief flats relieve the concentration of forces at the ends of the primary cutting edges of the blade.

Abstract: A tool assembly includes an axially symmetric tool having a tapered forward end, a radial flange, and a cylindrical shank. A retainer is fitted around the cylindrical shank, a washer is fitted around the retainer, and an O-ring is fitted over the retainer behind the washer to retain the washer thereon. When the rotatable shank is fitted into a cylindrical mounting bore of a tool holder, the O-ring prevents the washer from rotating with the tool.

Abstract: An insert for a cutting tool has a conical cutting tip, and axially behind the cutting tip is a mid-section. Behind the mid-section is a cylindrical base. Where the insert is for use on a tool of a milling machine, the base has a diameter of at least 0.800 inch so as to be considerably larger than the standard base of inserts currently in use on such machines. The enlarged base protects the tool body to which the insert is attached from washaway. The invention is useable in other industries employing rotary cutting tools. In other industries, the insert is made with an enlarged diameter base so as to protect the tool body behind the insert from erosion or washaway. Indentations in the outer circumference of the base improve the rotation of the tool and provide channels through which loosened particles of hard material are directed, thereby further reducing erosion of the tool body.

Abstract: An improved bit holder with its mating bit block is disclosed utilizing a slight taper in the bit block bore, and a tapered shank on the bit holder that includes a second larger diameter tapered distal segment that combines with an axially oriented slot through the side wall of the bit holder shank to allow a substantially larger interference fit between the distal tapered shank segment and the bit block bore than previously known. When inserting the bit holder in the bit block bore, the distal first tapered segment resiliently collapses to allow insertion of that segment into the bit block bore. A second shank tapered portion axially inwardly of the first distal tapered portion. The dual tapered shank allows the insertion of the bit holder in the bit block with an interference fit that provides a secure mounting of the bit holder in the bit block.