Abstract: A stump grinding device includes a wheel having an outer peripheral edge in which a plurality of recesses are formed. Disposed in each recess is a plurality of cutting units each including a block affixed to a floor of the recess, and a bit mounted in the block. Each bit includes a hard tip disposed at a front end thereof. The bits of some of the peripheral cutting units are rotatable relative to their respective blocks, with the hard tips thereof being generally pointed. The bits of others of the peripheral cutting units are non-rotatable to their respective blocks, with the hard tips thereof forming elongated cutting edges. The peripheral cutting units are spaced from leading and trailing ends of the respective recesses to provide spaces for the passage of cuttings.

Abstract: A milling cutter composed of various disks joined together to form a unit is proposed. A tool disk 11 is fixedly joined to at least one supporting disk 12 at the side by soldering, gluing or welding. The inside diameter of the bore 15 of the tool disk 11 corresponds at least to the inside diameter of the bore 16 of the supporting disk 12.

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, 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: A tool for a coal cutting, mining or road cutting machine, having a round-shaft cutter with a cutter head and a cutter shaft. The cutter head rests on a wear-protection disk having an opening. The cutter shaft passes through the opening and the cutter shaft has a clamping element which maintains the round-shaft cutter captively but rotatable around a center longitudinal axis of the receiver, in a receiver of the cutter holder. For a cost-effective fixation of the wear-protection disk against relative rotation, the wear-protective disk has a tab formed on it, which is designed as a holding element and is bent in a direction toward the cutter holder, and which is interlockingly fixed in place in the circumferential direction of the wear-protection disk on a stop of the cutter holder. In one embodiment, the wear-protection disk is fastened on the clamping sleeve.

Abstract: According to the present invention a bit holder block that can be durably connected to both a driven chain and rotary drum is disclosed. The bit holder block is designed to enable it to be welded or fused by other well-known methods to either a rotary drum or driven chain. The invention includes a bottom surface for welding to either a drum or chain. The bottom surface includes a central arcuate surface and flanking flat surfaces at opposite ends of the central arcuate surface. On the flat plate of driven chain cutting machinery the flanking flat surfaces sit squarely on the flat plate. When welded to a drum the base's bottom surface makes two lines of contact with the drum limiting the likelihood of undesirable.

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: An assembly that includes a rotatable cutting tool and a tool holder. The rotatable cutting tool has an integral enlarged dimension portion mediate which has a periphery and a rearwardly facing surface which defines a generally planar shoulder. The tool holder includes a bore and has an integral mating surface which surrounds the forward end of the bore. The mating surface has a peripheral edge. The rotatable cutting tool is rotatably retained in the bore of the tool holder body so that the shoulder of the elongate cutting tool body contacts the mating surface of the tool holder body and the periphery of the enlarged dimension portion of the elongate cutting tool body extends radially outwardly past the peripheral edge of the mating surface.

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, 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: According to the present invention a bit holder block that can be durably connected to both a driven chain and rotary drum is disclosed. The bit holder block is designed to enable it to be welded or fused by other well-known methods to either a rotary drum or driven chain. The invention includes a bottom surface for welding to either a drum or chain. The bottom surface includes a central arcuate surface and flanking flat surfaces at opposite ends of the central arcuate surface. on the flat plate of driven chain cutting machinery the flanking flat surfaces sit squarely on the flat plate. When welded to a drum the base's bottom surface makes two lines of contact with the drum limiting the likelihood of undesirable.

Abstract: A “wet” pick box 1 comprises a body member 2, adapted in use to be welded to a rotary cutting head, whilst an aperture 5 is provided in the body member. Bores 15, 16 in the body member define an internal water course 6 connectable, at an inlet end 7, to a source of pressurised water; an aperture 8 in the body member is adapted to house a water discharge nozzle and is connected to an outlet end 9 of the watercourse 6. A tapped hole 10 intersects the bores 16 and a member 11A or 11B is insertable into, and removable from, the hole 10. The invention also includes a rotary mineral cutting head to which a plurality of such pick boxes are welded.

Abstract: A mounting member (1), for a mineral cutting apparatus (2), has an enlarged head (3) incorporating an annular seating shoulder (4), whilst a circular section pin (5) extends integrally from the head (3) and is adapted to be received in a circular section socket (11) of a pick box (12) and to be retained therein, a circumferential groove (16) being provided intermediate the ends of the pins (5) to receive a fluid sealing member (17), with a first portion (24) of the pin (5) being of such diameter that, in use, it is a slide fit within a pick box socket (11), and with a second portion (25) of the pin (5), being of such diameter that, in use, it is an interference fit within a a pick box socket (11). The invention also includes a pick box; a mounting member and a pick box combination; a drum for a mineral cutting apparatus; mineral cutting apparatus; a road planing machine; a mining machine, and a tunnelling machine.

Abstract: A tool for a coal cutting, mining or road cutting machine, having a round-shaft cutter with a cutter head and a cutter shaft. A wear-protection disk is pushed on the cutter shaft, on an upper side of which the cutter head rests. The cutter shaft is captively held in a receiver of a holding projection of a cutter holder in a direction of a center longitudinal axis of the projection but freely rotatable around the center longitudinal axis. The projection has a support surface which extends at least in sections around the receiver on which a wear-protection disk rests with an opposite surface and is supported on a support surface of the cutter holder. The cutter head rests on the upper side of the wear-protection element facing away from the support surface.

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: An excavation cutting tool holder includes a cutting tool holder having a holder body portion and a holder shank, the holder shank having a press fit portion and a shank bottom end, the shank press fit portion having a shank press fit dimension and the shank bottom end having a tool holder locator. The excavation cutting tool holder assembly further includes a support block having a block body, the block body having a block bore, the block bore having a block bore press fit portion and a block engagor, the block bore press fit portion having a block bore press fit dimension less than the shank press fit dimension such that the shank press fit portion press fits with the block bore press fit portion while the block engagor engages the tool holder locator so as to orient the cutting tool holder relative to the support block.

Abstract: A toolholder for securing a cutting tool used for mining and construction applications whereby the holder has a recessed groove to provide access to the underside of a flange on the cutting bit to promote removal of the cutting tool from the toolholder.

Abstract: An excavation cutting tool holder retention assembly includes a support block having a tool holder bore, the tool holder bore having a bore interior surface. The excavation cutting tool holder retention assembly also includes a cutting tool holder having a shank portion, the shank portion having a shank engagement surface. The excavation cutting tool holder retention assembly further includes a locking member forced between the bore interior surface and the shank engagement surface so as to frictionally retain the shank portion of the cutting tool holder within the tool holder bore.

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. 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 cutter tool comprises a tool holder, a cutting bit mounted in a bore of the tool holder, and a washer disposed between the tool holder and the cutting bit. The washer is a conical (Belleville) washer which makes annular line contact with a shoulder of the cutting bit, and with an edge of the bore of the tool holder, in order to effectively seal-out fines from the bore.

Abstract: A toolholder for milling drums of scarifying machines including a body having a longitudinal axis, at one end provided with a housing suitable to house a milling tool. The body of the toolholder has an outside annular groove so as to reduce the resisting section of the toolholder and form a pre-set breaking area.

Abstract: A pick holder (110) is frictionally seated via a round cylindrical barrel (112) in a pick box of a continuous miner. A pick is in operation rotationally located in a bore (114). The bore (114), toward a rear thereof, has an internal, inwardly projecting screw thread (30). When the pick has been removed, the pick holder (110) is extracted from the pick box by screwing a screw threaded shank into the screw thread (30), and applying an extracting force via the shank and the interengaged screw threads to the pick holder (110).

Abstract: A tooth attachment for earth working equipment which is configured to receive a conventional cutter bit. The tooth attachment includes a body which defines an upper end and a lower end. The upper end defines a bit holder configured to receive a conventional cutter bit and the lower end is configured to be releasably securable to the post of an implement of earth working equipment such as dragline equipment, a backhoe, a bulldozer, a grader or the like.

Abstract: Cutting bit holding elements removably receiving cutting bits are secured to a cutting assembly used in a roadway surface reclaiming machine. The cutting assembly includes a driven member having a surface, typically cylindrical, rotatable in a cutting direction. The surface includes a plurality of recesses arranged in a preselected pattern, each recess being defined by a generally circular upper edge and including a bottom surface depressed below the driven member rotatable surface. Each cutting bit holding element has a body portion having at least one aperture receiving the cutting bit and a lower portion having a generally cylindrical outer surface sized to be received in only one of said recesses The lower portion has a reference lower end abutting the recess bottom surface with a locating element engaging the cutting bit holder element lower end with a niche within said recess for orienting the cutting bit holder with respect to said cutting direction.

Abstract: An excavation cutting toolholder retention system. The cutting toolholder retention system includes a cutting toolholder having a flange recess and a holder engagement surface and a support block having a toolholder bore into which the cutting toolholder is inserted and a block pin bore intersecting the toolholder bore, the block pin bore defining a block engagement surface which is inclined downwardly relative to the toolholder bore. The cutting toolholder retention system further includes a pin having a pin shaft, the pin shaft having a pin flange which engages the flange recess so as to limit translational movement of the pin shaft. The pin engages the block engagement surface and the holder engagement surface such that the pin may be moved to draw the cutting toolholder into the toolholder bore.

Abstract: A cutting, self-rotating, and self-sharpening tool has a rotatable cutting element, generally circular, which is mounted and displaced so that cutting element has an attack angle between 90.degree. and 120.degree., and a skew angle between 5.degree. and 40.degree.. The cutting element has a convex front face and relief and rake angles that vary along the perimeter of the cutting edge.

Abstract: An excavation cutting tool holder retention system. The cutting tool holder retention system includes a cutting tool holder having a holder engagement surface and a support block having a tool holder bore into which the cutting tool holder is inserted. A pin having a pin engagement surface is movably mounted to the support block. At least one of the holder and pin engagement surfaces defines an inclined surface such that when the pin is moved the pin engagement surface will wedgingly engage the holder engagement surface so as to draw the shank portion of the cutting tool holder into the tool holder bore.

Abstract: A pick box (3) and sleeve (6) combination comprises a sleeve-receiving aperture (5) in the box (3), with the sleeve (6) located in the aperture (5) and adapted, in use, to receive the shank (17) of a mineral cutter pick (7). A zone (33) of differential area is provided between the external periphery of the sleeve (6) and the aperture (5). A fluid sealing ring (29) is located to each side of the zone (33) of differential area, and a hydraulic fluid entry bore (30) is located intermediate the two sealing rings (29) and is in fluid flow communication with the zone (33), whereby upon admission of hydraulic fluid under sufficient pressure to the zone (33) via the entry bore, the fluid, being confined by the sealing rings (29), effects hydraulic, axial displacement of the sleeve (6) with respect to the box (3). The invention also includes a mineral cutting drum (1) provided with a plurality of such pick and box combinations, and also to a machine provided with at least one such drum.

Abstract: Apparatus for supporting a mining bit in a bit holder which attaches to the rotatable drum of a mining machine. The apparatus comprises a sleeve that is adapted to be received in aperture in the bit holder. The sleeve has an aperture therethrough for rotatably receiving a cutting bit. The sleeve has a body portion and a collar which serves to prevent axial movement of the sleeve relative to the bit holder. An under cut area is provided in the body portion and/or the collar to reduce the peak amount of stress that develops between the body portion and collar. The bit holder and sleeve are constructed such that the position of the sleeve may be fixed axially with respect to the body portion by an interference fit in such a manner that it may be easily removed from the body portion.

Abstract: A cylindrical cutting element for a cutting machine which includes base ps arranged at a uniform distance from each other. A chisel holder which receives an exchangeable chisel is secured with respect to each base element. The chisel holder has a plug connector which allows the chisel holder to be inserted into a plug receiver of the base element, where it is held by a pressure screw on the base part that grips the plug connector. To relieve the plug connector from the forces acting on the chisel, the base part has a projection which extends in an approximately parallel direction to the running direction of the cutting element and a stop that follows the projection in the running direction and forms an angle therewith. The stop limits the insertion of the chisel holder into the base element and absorbs forces transmitted through the chisel to the chisel holder.

Abstract: A mining drum assembly for use in the mining of a substrate that has a drum. A plurality of bars, each one of the bars has a plurality of laterally-spaced apart mining bit assemblies connected thereto, are affixed to the surface of the drum. The bars define first and second regions of discrete bars equi-spaced about the circumference of the drum. The bars of the first region being circumferentially and laterally spaced-apart from the bars of the second region.

Abstract: An excavation cutting tool holder retention system. The cutting tool holder retention system includes a cutting tool holder having a holder engagement surface and a support block having a tool holder bore into which the cutting tool holder is inserted. A pin having a pin engagement surface is movably mounted to the support block such that the pin engagement surface may be moved to engage the holder engagement surface. At least one of the holder and pin engagement surfaces defines an inclined surface such that when the pin engagement surface is moved to engage the holder engagement surface, the shank portion of the cutting tool holder will be drawn into the tool holder bore. In the preferred embodiment, at least one of the cutting tool holder and tool holder bore is tapered such that the cutting tool holder will be drawn and wedged into the tool holder bore of the support block when the pin engagement surface is moved to engage the holder engagement surface.

Abstract: A cutting drum adapted to be mounted in a roadway surface reclaiming machine includes a cylindrical surface rotatably driven about its axis in a cutting direction. A plurality of cutter bit holding elements are distributed in a pattern over and fixed to the cylindrical surface, each cutter bit holding element having a base portion including a first opening and a second opening. A first cutter bit is received in the first opening and a second cutter bit is received in the second opening. The first and second openings are positioned so that the second cutter bit trails immediately behind and is aligned with the first cutter bit when the cylindrical surface is rotated in the cutting direction, the first and second cutter bits being inclined forwardly in the cutting rotation direction. The first and second openings are situated at two different heights so that the second cutter bit is situated at a greater radial distance from the rotation axis of the cylindrical surface than is the first cutter bit.

Abstract: A mining drum assembly for use in the mining of a substrate that has a drum. A plurality of bars, each one of the bars has a plurality of laterally-spaced apart mining bit assemblies connected thereto, are affixed to the surface of the drum. The bars define first and second regions of discrete bars equi-spaced about the circumference of the drum. The bars of the first region being circumferentially and laterally spaced-apart from the bars of the second region.

Abstract: A rotating cutting tool has a cutting annular element which is mounted and displaced so that the cutting annular element has an attack angle exceeding 90.degree.. The cutting element has a convex cutting front face and a skew angle between 0.degree. and 90.degree..

Abstract: The bit holder (1) is nonpositively connected to a bit bushing (3) with adherence to a pressure per unit of surface area of >100N/mm.sup.2 between the conical outer surface of the bit bushing (3) and the inner wall of the receiving bore (2) of the bit holder (1). After the bushing has been driven into the receiving bore (2), the conical outer surface of the bit bushing (3), formed by rectilinear generatrices, protrudes beyond the bore (2) by an excess amount (a).

Abstract: In a tunnel excavator for tunneling by rotating a cutter head provided in front of a shield body to thereby excavate the working face of a tunnel using disk cutters attached to the front surface of the cutter head, the cutter head is composed of an annular beam, an arched main spoke provided across the annular beam and a plurality of arched sub-spokes radially provided thereon and disk cutter assemblies are detachably attached to the main spoke and sub-spokes, so that the disk cutter has a simple structure and the reaction force of excavation is broken up by the main spoke and sub-spokes to be transmitted to the annular beam. As a result, it is possible to provide a strong and durable cutter head which can be easily manufactured.

Abstract: A concave cutter bit which has a bit body that contains a concavity in the axially forward end thereof. A plurality of cutter inserts are brazed to the bit body at the periphery of the open end of the concavity. The cutter inserts are spaced-apart in such a fashion so that a gap exists between adjacent cutter inserts that is of sufficient size to prevent the formation of a continuous braze joint between any adjacent cutter inserts.