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 generally cylindrical hollow shank that mounts the bit holder to the bit block includes at least one axially aligned slot along its side wall that allows the side wall to supply radial force to maintain the bit holder in the bit block.

Abstract: A rotary cutter for a tunnel boring machine or similar machine has a cutter ring mounted to a hub. The hub is mounted on a shaft. A sleeve bearing system is positioned between the hub and the shaft for supporting the hub on the shaft and allowing relative rotation. A duo-cone seal assembly is positioned between the hub and the shaft to seal out contaminants from the sleeve bearing system. An oil gallery with lubricating oil for lubricating the sleeve bearing system is provided in the shaft.

Abstract: In one aspect of the invention, a degradation pick comprises a bolster disposed intermediate a shank and an impact tip. The shank comprises an outer diameter and first and second ends. The shank is coupled to the bolster through the first end and the second end is adapted for insertion into a central bore of a holder attached to a driving mechanism. The shank comprises a hollow portion disposed within the outer diameter and between the first and second ends. The hollow portion may comprise an opening that is disposed in the second end. In some embodiments the hollow portion may comprise a length that is at least as great as the outer diameter.

Abstract: A cutting pick comprising an elongate shank and a cutting tip which is mounted to one end of the shank to project from that end. At least two sleeve segments are provided and those segments are circumferentially fixed about the shank to form a substantially annular sleeve. The sleeve can be fixed about the shank in non-contacting relationship with the trailing end of the cutting tip. Moreover, the cutting tip can have a portion of maximum diameter which is of greater diameter than the inner diameter of the sleeve so that the portion of maximum diameter overlies the sleeve radially.

Abstract: A road grading pick includes a cutting head, a shank, a shoulder at a transition between the cutting head and the shank, and a polygonal-shaped washer or an oval-shaped washer. The shank is positioned in an opening of the washer to position the washer along a longitudinal length of the shank between a rearward end of the shank and the rearward facing surface of the shoulder. In a preinstalled position, the washer compresses a friction retainer on the shank of the road grading pick to facilitate seating of the road grading pick in a blade of a road grading apparatus. In an installed position on an adapter board for a moldboard of road grading equipment, the friction retainer is no longer in the opening of the washer and the washer prevents washer rotation and shields an underlying mounting surface while allowing rotation of the road grading pick.

Abstract: A cutting bit retention assembly (399) that includes a cutting bit holder (500), which receives a cutting bit (58) and has shank (504) that extends into a bore (418) in a support (400). The shank section (504) of the cutting bit holder (500) presents a surface (530) defined by a notch (528) that selectively cooperates with a retention pin (670). A transverse bore (430) in the support (400) carries the retention pin (670). The retention pin (670) is selectively movable to any one of several positions. One position is a non-retaining position wherein the retention pin (670) does not engage the notch surface (530). Another position is a retaining position in which the retention pin (670) engages the notch surface (530) to urge the cutting bit holder into the cutting bit holder bore (418). Still another position is an ejecting position in which the retention pin (670) engages the notch surface (530) to urge the cutting bit holder (500) out of the cutting bit holder bore (418).

Abstract: A pair of semi-cylindrical segments adapted to be connected to form a center drum of a cutter head of a mining machine. The split line between the semi-cylindrical segments is not continuous, but lies on more than one plane.

Abstract: A bit holder for use in a bit assembly in road milling, mining and trenching equipment has a hollow generally cylindrical shank and first and second elongate slots positioned in spaced axial relation through the shank. The first slot extends along the shank to the distal end thereof. The second slot may be altered in length and/or shaped to fine tune the outward radial force the shank exerts against the bore of a bit holder block into which it is inserted.

Abstract: In one aspect of the present invention, a degradation assembly has a holder fitted within a block attached to a driving mechanism. The holder has a longitudinal central bore with an opening at an end opposite the driving mechanism. A high impact resistant tool has a carbide bolster axially intermediate a steel shank and an impact tip, the steel shank having a first end and a second end. A sleeve being radially intermediate the bore of the holder and the steel shank.

Abstract: In one aspect of the present invention, a degradation assembly comprises a shank with a forward end and a rearward end, the rearward end being adapted for attachment to a driving mechanism, with a shield rotatably attached to the forward end of the shank. The shield comprises an underside adapted for rotatable attachment to the shank and an impact tip disposed on an end opposing the underside. A seal is disposed intermediate the shield and the shank.

Abstract: In one aspect of the present invention, a degradation assembly comprises a pressing seal element and a pressurized rigid element disposed intermediate a rotating component and a stationary component. The rotating component comprising an impact tip bonded to an end opposing the stationary component. The seal element may energize the rigid element against one of the components to form a slidable seal capable of holding lubricant within the assembly and keeping debris out while still rotating.

Abstract: In one aspect of the present invention, a pick comprises a forward end and rearward end. The forward end comprises a shearing cutter and the rearward end comprises a shank. The shank and the shearing cutter are arranged co-axially about a central axis. The shearing cutter is supported by an enlarged section that narrows towards the shearing cutter and that has a greater cross section than the shank along a plane substantially perpendicular to the central axis. The shearing cutter comprises a flat surface that is substantially perpendicular to the central axis.

Abstract: A roller drill for removing material, such as in particular rock, minerals or the like, according to the undercutting principle, comprising a cutting face which is formed concentrically around a central axis and widens conically toward an end face of the roller drill, and includes a supporting body which is arranged on the inner side of the cutting face and extends up to the end face of the tool. In order to provide a roller drill or a roller bit of which the tool life or service life is improved compared with the prior art, the cutting face is made of a harder material than the supporting body and the supporting body forms an annular web which is conical at least at an outer circumferential wall and which defines with its inner circumferential wall a free space at the end face of the tool. The tool can resharpen itself automatically due to the free space and the dissimilar material combination.

Abstract: The invention relates to a shank chisel comprising a chisel head (10) and a chisel shank (20), wherein the chisel shank bears a clamping sleeve (23), in which the chisel shank is held captively in the direction of its longitudinal axis and freely rotatably about its longitudinal axis. To allow such a shank chisel to be both assembled and disassembled through a chisel receptacle (31) of a chisel holder (30) that is formed as a receiving bore, it is provided according to the invention that the chisel shank bears at its end remote from the chisel head a shank extension (20.1), that the shank extension has a tool receptacle (26), and that the tool receptacle is accessible by way of a spacing region of the shank extension in the axial direction of the chisel that is set back from the lateral surface of the chisel shank and/or from the lateral surface of the clamping sleeve.

Abstract: In one aspect of the present invention, a degradation assembly comprises a holder attached to a driving mechanism and comprises a longitudinal central bore. The bore comprises an opening at a distal end from the driving mechanism. A pick comprising a body intermediate a shank and an impact tip is connected to the holder, the shank being disposed in the central bore of the holder and the body extending from the opening of the bore. A tensioning mechanism is disposed within the bore and is adapted to put the shank in axial tension.

Abstract: An apparatus for the milling and/or drilling cutting of materials, in particular for the removal of rock, minerals or coal, with a tool drum which is mounted on a drum carrier rotatably about a drum axis, in which a plurality of tool shafts, which carry cutting tools at their ends projecting from the tool drum, are rotatable drivable mounted, at least two of the tool shafts being drivable by a common gear drive which has power take-off gearwheels arranged fixedly in terms of rotation on the tool shafts, and a common drive element which cooperates with the power take-off gearwheels. The drive element and the tool drum being rotatable in relation to one another and the shaft axes of the tool shafts standing transversely to the drum axis.

Abstract: In one aspect of the present invention, a degradation assembly comprises a shank with a forward end and a rearward end, the rearward end being adapted for attachment to a driving mechanism, with a shield rotatably attached to the forward end of the shank. The shield comprises an underside adapted for rotatable attachment to the shank and an impact tip disposed on an end opposing the underside. A seal is disposed intermediate the shield and the shank.

Abstract: A system for excavating and/or trenching hard and soft ground material includes a support block having a bore with a cylindrical portion and a non-cylindrical portion with flat surfaces and a cutting tool mounted in the bore, which may be a non-rotatable cutting tool having a shank with flat surfaces or a rotatable cutting tool having a shank with a cylindrical portion. The non-cylindrical portion of the bore rotatably engages the cylindrical portion of the rotatable cutting tool and the flat surfaces of the bore engage the flat surfaces of the non-rotatable cutting tool. A further embodiment includes a support block having a bore with flat surfaces along the entire length of the bore that engage the flat surfaces of the shank of the non-rotatable cutting tool and which bore receives the cylindrical portion of the shank of the rotatable cutting tool but does not restrain rotation thereof.

Abstract: A high impact resistant pick in a holder having a super hard material bonded to a cemented metal carbide substrate at a non-planar interface. The cemented metal carbide substrate is bonded to a front end of a cemented metal carbide bolster. A bore is formed in a base end of the carbide bolster generally opposed to the front end. A steel shank being fitted into the bore of the bolster at a bolster end of the shank, and a portion of the shank is disposed within a bore of the holder at a holder end of the shank.

Abstract: In one aspect of the present invention, a tool assembly comprises a rotary portion and a stationary portion. The rotary portion comprises a bolster bonded to a diamond symmetric, substantially conically shaped tip. The stationary portion comprises a block mounted to a driving mechanism. A compressible element is disposed intermediate and in mechanical contact with both the rotary and stationary portions. The compressible element is compressed sufficiently to restrict free rotation during a degradation operation.

Abstract: A fixing device for a shank chisel including a base part to which a chisel holder is attached in a manner that enables it to be exchanged. The chisel holder has a chisel location for the shank chisel and has a supporting face on which the shank chisel can be supported. The chisel holder is coupled to the base part by a pivot bearing, and the chisel holder rests against a mating face of the base part. This invention provides a stress-optimized design for the above-mentioned arrangement. Thus, according to this invention, when the chisel holder is mounted, a contact area formed between the contact face and the mating face is located between a rotation axis or a rotation path of the pivot bearing and the supporting face.

Abstract: A sleeve utilizing two methods of retention—a friction fit and a rear retention feature—is disclosed. The sleeve includes a circumferentially compressible portion that provides a friction fit when inserted into a bore and includes a projected portion around an end circumference that is used to mate with the rear of a tool block and urges the sleeve (and the tool) rearward. The disclosure also relates to a tool and block assembly, a method of retaining a tool in a holder and a mining machine incorporating the sleeve.

Abstract: The invention relates to a trench cutter comprising at least two cutting wheels or pairs of cutting wheels, whose axes of rotation are offset from each other. A forced synchronization is achieved in accordance with the invention in that a single drive motor is provided which jointly drives the at least two cutting wheels or pairs of cutting wheels by means of a gear arrangement.

Abstract: A round shaft chisel with a clamping sleeve, wherein the round shaft chisel has a chisel head and a chisel shaft rotatably maintained in the clamping sleeve. A pivot bearing is between an inner contour of the clamping sleeve and a shaft contour of the chisel shaft so that a center longitudinal axis of the round shaft chisel is pivotably seated with respect to a center longitudinal axis of the clamping sleeve. As a result of the induced tumbling motion of the round shaft chisel within the clamping sleeve 30, improved dirt removal can be assured during operations. The improved rolling action results in reduced wear between the clamping sleeve and the chisel shaft, which has advantageous results regarding the service life.

Abstract: A cutting pick comprises an elongate shank and a cutting tip mounted to one end of the shank. The cutting tip has a leading end, a trailing end and a mounting portion for mounting to the shank. The tip has a shape such that it diverges outwardly in a direction from the leading end to the trailing end to a portion of maximum diameter. An annular sleeve is attached about the shank adjacent to and in non-contacting relationship with the trailing end of the cutting tip. The maximum diameter of the cutting tip is of greater diameter than the diameter of the inner diameter of the annular sleeve so that the portion of maximum diameter overlies the sleeve radially.

Abstract: In one aspect of the invention, a degradation assembly has a holder attached to a driving mechanism and comprising a longitudinal central bore. The bore has an opening at a distal end from the driving mechanism. The pick has a body intermediate a shank and an impact tip, the shank being disposed in the central bore of the holder and the body extending from the opening of the bore. The impact tip has a diamond surface. The degradation assembly also has a lubrication mechanism adapted to apply lubrication to the shank.

Abstract: A high impact resistant tool comprises a steel shank. The steel shank has a hollow portion and first and second ends. The shank is adapted for insertion into a holder and connection to a driving mechanism. A carbide cap is joined at a brazed joint to the first end of the shank.

Abstract: A construction machine for machining floor surfaces, wherein the machine includes a milling roll having a plurality of tool holders on a surface thereof. A tool, especially a straight shank tool, is received in a tool receiving element of the tool holder in an exchangeable manner. With this invention it is possible to change the tool in one such construction machine in a simplified manner. Thus, the milling roll is associated with a tool changing device, and the tool changing device dismounts each tool from the tool holder and/or mounts each tool in the tool holder.

Abstract: A pedestal assembly for an asphalt cutter and/or a longwall shearer includes a cutting bit detachably secured in a tool body mounted within a block with the block fixedly secured to a pedestal. The first end of the pedestal has a recess to overlap the second end of an adjacent pedestal when the pedestals are mounted on the outer surface of a drum of the cutter. The first end of the pedestal further includes a lateral flat surface portion for deflecting material made loose by the cutting bit.

Abstract: A retainer system for a cutting tool that has an elongated shank. In one embodiment, the retainer system includes a tool holder block that has a sleeve-receiving hole therethrough for receiving a sleeve therein. The sleeve may have a shank-receiving hole and at least one undercut portion therein. The retainer may define a shank-receiving opening and have retainer portions that correspond to each of the undercut portions in the sleeve for selective retaining engagement therewith. The first and second retainer portions retainingly engage a portion of the elongated shank of the cutting tool when inserted into the shank-receiving opening therebetween.

Abstract: A cutting tool for use on earth working and land clearing equipment includes a working body portion having a cavity disposed therein which begins at a peripheral edge of a first end and extends inwardly towards a second end of such working body portion. The cavity is provided with a cutting portion disposed at an acute angle about such peripheral edge. A mounting shank extends outwardly from and is attached to the second end of the working body portion for enabling attachment of the cutting tool to a tool holder used on such earth working and land clearing equipment. At least one pin member engaging the complimentarily aligned grooves within an aperture of the tool holder and an outer surface of the shank portion is used to securely retain the cutting tool within the tool holder.

Abstract: An edge cutter bit assembly for use in conjunction with a rotatable drum having an edge. The edge cutter bit assembly includes a holder that includes a plurality of bores wherein each bores carries a chisel cutter bit so that the chisel cutter bit is non-rotatable. The holder is oriented with respect to the drum so that at least a portion of each one of the cutter bits extends past the edge of the drum.

Abstract: A chisel holder for a road milling machine or the like, having a base element which supports a holding neck, wherein the holding neck has a chisel receiver and a protrusion is connected to the base element upstream of the holding neck when viewed in an advancing direction of the tool. For improving the cutting output, in particular in connection with rough-chipped milling materials, the base element has a connecting section designed as a chip breaker, which is formed on the base element and extends, starting at the holding neck, at least partially over the protrusion.

Abstract: A bit block for use in excavation and mining. The bit block is adapted to receive a bit and to be welded to equipment utilized for boring, drilling, trenching and mining. The bit block is designed to secure and protect the bit while it is penetrating rock and hardened earth material. The bit block defines a shroud adapted to receive and protect the distal end of the bit. The bit block defines an enlarged welding surface to enhance the integrity of the weld. The bit block defines a plow on its leading end to assist in removing excavated material.

Abstract: A support base (1) which is to be mounted to the surface (2) of a milling drum (3) defining a direction of rotation (31) includes a recess (4) adapted to receive removably a shank portion (14; 21) of a body (5; 7) to be fixedly mounted to said support base (1). The recess (4) has a first side surface (101) facing into said direction of rotation (31) which is adapted to contact said shank portion (14; 21). The support base (1) further includes a reaction surface (111) adjacent to said first side surface (101) and also facing in said direction of rotation (31), wherein the reaction surface (111) is disposed at an angle of more than 180° with respect to said first side surface (101) and is adapted to bear against a support surface (151) of said body (5; 7).

Abstract: A core breaker that includes a support that contains at least one bore wherein the bore is defined in part by an axial forward frusto-conical wall and further defined by an axial rearward cylindrical wall that contains a groove therein. The core breaker has an elongate rotatable cutting tool that has an axial forward end and an axial rearward end, as well as a head adjacent to the axial forward end and a shank adjacent to the axial rearward end wherein the shank contains a reduced diameter portion. There is a frusto-conical shoulder mediate of the head and the shank. The cutting tool further includes a resilient retainer that has at least one radial outward protrusion. When the cutting tool is retained within the bore, the protrusions of the resilient retainer are received within the groove in the bore and the frusto-conical shoulder of the cutting tool is closely adjacent to the frusto-conical wall of the bore.

Abstract: The wear sleeve in the present cutter tool assembly comprises a rearward split ring portion and an intermediate cylindrical ring portion adjacent a forward shoulder portion. The outer diameter of the wear sleeve intermediate portion and rearward split ring portion is uniform. The wear sleeve is inserted into the bit holder's stepped bore aperture. The split ring portion is radially compressed by the smaller diameter rearward end as the sleeve is hammered and axially displaced into the bit holder. The split ring portion forms frictional contact with the opposite end portion of the aperture. The wear sleeve friction fit can be easily removed manually in the field. The bit holder and cooperating support block are designed to limit the amount of relative yaw between the two members during operation to reduce the overall wear there between.

Abstract: A tool mounting device for a milling drum, in particular a fine milling drum, is provided which includes a pedestal portion adapted to be connected to a surface of the milling drum. The pedestal portion has an extension from a side of the milling drum. The extension follows the contour of the milling drum surface, and is adapted to be welded to the drum surface.

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 cutting apparatus which includes a rotatable member having an outer surface and a plurality of cutting tool assemblies, wherein each assembly includes a cutting tool mounted in a holder. The cutting tool assemblies are mounted on the rotatable member so that the holder is shielded by the rotatable member, wherein the cutting tool extends beyond the outer surface of the rotatable member a sufficient distance to operate as a cutter.

Abstract: A cutting tool assembly having a holder block mounting scheme which effectively and accurately positions the cutting tip point at its designed angle of attack. The connection assembly limits undesirable shifting during attachment of the holder block to a cutting drum. The holder block connection assembly of the present invention includes a separate mounting plate that is positioned between the bit holder block and drum/pedestal for accurately aligning the bit holder block onto to the drum/pedestal. Once the bit holder block is aligned into position by the plate as designed the bit holder block is welded to the drum/pedestal.

Abstract: Improvements to the positioning and repositioning systems for the fixing of toolholders (3) to the drums of milling machines. The cylindrical shell of the drum (1) presents through slots (2) which allow a reliable positioning of the toolholders (3) during the removal operations. The toolholders (3) present congruent reference element (4, 4′, 4″) that engage the through slots (2).

Abstract: A cutting arrangement (10) includes a pick holder (12) having a bore (14) containing a sleeve (16) within which a shank (18) of a pick (20) is located. The pick (20) and the sleeve (16) each have heads (22; 24). The head (24) of the sleeve (16) has an outer abutting surface (26) and an inner abutting surface (30). The outer abutting surface (26) abuts an abutting surface (28) of the head (22) of the pick (20). The inner abutting surface (30) abuts an abutting surface (32) of the pick holder (12). The abutting surface (28) of the head (22) of the pick (20) has an outwardly curved formation (28.1) which abuts an inwardly curved formation (26.1) on the outer abutting surface (26) of the sleeve (16). The inner abutting surface (30) on the head (24) of the sleeve (16) has an outwardly curved formation (30.1). The abutting surface (32) of the pick holder (12) has an inwardly curved formation (32.1). The inwardly and outwardly curved formations (30.1; 32.1) abut one another.

Abstract: The wear sleeve in the present invention comprises a rearward split ring portion and an intermediate cylindrical ring portion adjacent a forward shoulder portion. The outer diameter of the wear sleeve intermediate portion and rearward split ring portion is uniform. The wear sleeve is inserted into the bit holder's stepped bore aperture. The split ring portion is radially compressed by the smaller diameter opposite portion end as the sleeve is hammered and axially displaced into the bit holder. The split ring portion forms frictional contact with the opposite end portion of the aperture. The wear sleeve friction fit can be easily removed manually in the field. The bit holder and cooperating support block are designed to limit the amount of relative yaw between the two members during operation to reduce the overall wear there between.

Abstract: A cutter assembly includes a cutting bit, a replacable wear surface in the form of a washer, and a sleeve. The cutting bit has a forward cutting tip, a rearward extending shank adapted to be received in a tool holder, and a rearward facing shoulder. The sleeve surrounds the shank and includes a forward edge. The washer includes a central hole receiving the cutting bit shank, a front surface and a back surface joined by an outer asymmetrical edge of angularly variable radius. A portion of the washer front surface is in sliding contact with the rearward facing bit shoulder. The washer back surface includes a lip extending rearward from only a segment of the asymmetric edge for engaging an outer shoulder of a holder to inhibit rotation of the washer relative to the holder.

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 fixture for attaching a round shank chisel to a road milling machine or the like. The round shank chisel has a chisel head and a chisel shank. With a bearing surface the chisel head rests upon a wearing protection disk which in turn rests on and is supported by a chisel holder. The chisel shank is accommodated by a location bore of the chisel holder. This invention prevents dirt from penetrating the area of the location bore of such a fixture and at the same time ensures that the free movability of the round shank chisel is not impaired. Thus, the chisel holder has a circumferential projection or a circumferential depression which extends along the location bore. Also, the wearing protection disk has a circumferential receiving groove or a circumferential shoulder and the projection or the depression of the chisel holder engages with the receiving groove or the depression of the wearing protection disk when the round shank chisel is assembled.

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 has 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 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 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.