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 blade has a central slot extending into the forward end thereof such that the slot defines inner side wails and a bridge extending between the inner side walls. A protrusion along the leading face of each of the cutting sides of the blade with each protrusion extending to the forward edge extends the length of the cutting edges and by distributing the load along a greater length reduces the stress to the cutting edge. Protrusions along the trailing face of the blade also extern to the cutting edge and increase the strength 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: A cutting tool has tool body with a seat at a forward end thereof. A hard cutting insert is bonded into the seat. The insert is made of a hard material and Ahas an elongate central portion having a maximum upper diameter and a maximum lower diameter that is less than the maximum upper diameter. A collar, also made of a hard material, surrounds the base of the elongate central portion of the insert.

Abstract: A cutting tool has a tool body with a seat at the forward end thereof and a cutting insert in the seat. The insert has a central portion made of a hardened material, and surrounding the central portion is a softer metal sleeve. Surrounding the metal sleeve is a collar made of the hardened material.

Abstract: A tool body is cold formed by inserting a blank into a die which defines a portion of the outer surface of the tool body after which a punch applies an impact to the blank causing the outer surface of the blank to conform to the contour of the die. The completed tool has an elongate hub with a cylindrical forward portion having a diameter sized to rotatably fit within the bore of a tool holder and a rearward portion with a diameter a little less than the that of the forward portion. The smaller diameter rearward portion facilitates the insertion and alignment of the tool in the tool holder.

Abstract: A cutting tool has a centrally located tungsten carbide insert brazed into a seat at the forward end of the tool. The seat has a circular mouth and rearward of the mouth is a frustoconical inner wall. At the bottom of the seat is a transverse surface. A tungsten carbide insert is brazed into the seat and the base of the insert is complementary in shape to the seat. A second annular insert may also be brazed into a complementary shaped annular seat that surrounds the centrally located seat.

Abstract: An improved bit assembly for road milling, mining, and trenching equipment includes a streamlined tip assembly that is a combination of conical and cylindrical in shape and devoid of protrusions or annular indentations that might impede the flow of removed material over and around the bit assembly or provide space for removed material to become clogged or imbedded on the tip assembly. The portion of the bit block which mounts on a drum or endless chain extends from a cylindrical portion of the bit block and provides opposed angled shoulders which extend downwardly and away from a central ridge on the bit block to again provide for efficient flow of removed material over and around the bit block.

Abstract: A conical bit penetrator pocket protector for earth displacement equipment for maximizing penetration into hard rock during trenching, drilling, mining, or boring operations. The bit penetrator pocket protector for earth displacement equipment includes a body which defines an upper bit end and a lower shank end. The upper bit end defines a bit insert opening configured to detachably accept a penetrator bit tip. The lower shank end is configured to be securable to a penetrator holder that is welded to an implement of earth working equipment such as trenching equipment, rock saw equipment and/or a rotatable drum, or the like. A flange, or pocket protector, is defined between the upper and lower ends in order to provide protection for the bit penetrator lower end and a holder in which it is received by miniring rock and earth fines from contacting and building up between the holder and bit penetrator.

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.

Abstract: A tool mounting block has a body with a forward surface, and a cylindrical bore extending into the body perpendicular to the forward surface. A frustoconical countersink extends around the opening of the bore into the forward surface and a tungsten carbide collar is fitted into the countersink. In another embodiment the forward surface of the mounting block has at least one radial groove extending to an outer wall thereof.

Abstract: A cutting tool has a tool body with a hardened insert brazed into a cylindrical seat having a given diameter at the forward end of the tool body. The insert has a cutting tip portion, a generally cylindrical base portion positioned behind the tip, and a frustoconical midsection extending from the tip section to the base section. The base section of the insert has a diameter substantially less than the diameter of the seat and a plurality of radial projection extending outward of the base section assist in aligning the base section within the seat prior to brazing the parts together.

Abstract: A tool body is cold formed by inserting a blank into a die which defines a portion of the outer surface of the tool body after which a punch applies an impact to the blank causing the outer surface of the blank to conform to the contour defined by the die. The tool body has a tapered forward end, a central radial flange and a rearward cylindrical shank. To cold forge a fixed diameter in the central flange of the tool the forging die has a cylindrical portion having an inner diameter equal to the desired diameter of the flange, the die having an end to allow overfill to be released forward of the fixed diameter portion. Also, a shoulder is formed between the cylindrical shank and a frustoconical portion between the shank and rear surface of the flange. Finally, the shank has an elongate cylindrical hub to facilitate alignment of the tool.

Abstract: A tubular part is brazed into coaxial relationship with the bore in a metal body part having a counterbore for receiving the tubular part. In a first embodiment a tubular sleeve is fitted within the bores of the metal body and the tubular part. The parts are then heated and vibrated while the braze material is melted. In a second embodiment a frustoconical plug is inserted into the coaxial bores of the parts and the parts are again heated and vibrated. The parts are allowed to cool until the braze material hardens, after which the vibration is terminated. The remaining sleeve or plug is then machined out of the two bores leaving the tubular part brazed to the metal body.

Abstract: An improved bit holder with its mating bit block utilizes 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 know. 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 and separated therefrom by a shoulder provides a space between the bit block bore and the second tapered shank portion until the upper ⅛ to ½ inch of the second tapered shank portion meets and again forms an interference fit with the bit block bore at a portion of the shank above a termination of the slot therethrough.

Abstract: Improvements in bits, bit holders and bit blocks used in road resurfacing equipment and mining and trenching equipment provide for improved rotatable bit holders in the bit block, ease of removability of bits from bit holders and for predetermined points of desired failure of any member of the combination if the bit should encounter a hard discontinuity while performing its work.

Abstract: A tool mounting block for a cutting machine has a forward surface and an aperture in the forward surface for receiving the cylindrical mounting portion of a tool. The forward surface has a plurality of radial grooves therein extending to the outer surface of the tool mounting block. To extend the useful life of the mounting block, an annular insert is fitted around the aperture such that the forward surface of the insert provides a bearing surface to facilitate rotation of the tool within the mounting block.

Abstract: A rotatable cutting tool for earth displacement equipment for maximizing penetration into hard rock during mining, trenching, drilling, or boring operations. The bit penetrator pocket protector for earth displacement equipment includes a body which defines an upper bit end and a lower shank end. The upper bit end defines a bit insert opening configured to detachably accept a penetrator bit tip. The lower shank end is configured to be securable to a penetrator holder that is welded to an implement of earth working equipment such as the chain excavator or a rotatable drum, or the like. A flange, or pocket protector, is defined between the upper and lower ends in order to provide protection for the bit penetrator lower end and a holder in which it is received by minimizing rock and earth fines from contacting and building up between the holder and bit penetrator.