Abstract: An improved tool holder of the type having an insert receiving pocket and using tiltable pin to clamp an insert in the pocket. The pin is located in a bore through the bottom of the pocket of the tool holder and is tiltable therein so that one end of the pin engages a center hole of an insert and clamps it in the pocket. A recess communicates with the bore near the lower end of the pin when the pin is in the bore and spherical elements such as balls are disposed in said recess. Means for moving said spherical elements are provided so that the pin is tilted into clamping position on the insert. A top clamp is provided that cooperates with the pin element in clamping said insert.

Abstract: A collapsible boring bar is disclosed having radially movable tool units on its outer periphery. The tool units are moved radially by an axially slidable ramp means that acts on cylindrically shaped rollers. The ramp means are located in grooves formed in a tapered spacer element that is located within the head of the boring bar.

Abstract: A rotary tool is disclosed which is adapted to be mounted on a machine having power drive means and movable over a field surface to produce furrows therein. The rotary tool comprises bit elements mounted in abutting relation from a peripheral surface of a disc and having compacts of hard wear resistant material which form the leading edge of the bit elements that are to engage the earth.

Abstract: A stump cutter is disclosed having a rotatable shank upon which a transverse support bar is attached. Tool holders are mounted in a distributed relation on the support bar and replaceable cutter bits are mounted in the tool holders. Mounted on the forward end of either the shank or support bar is a pilot member that holds the stump cutter engaged to the stump during cutting operations.

Abstract: A milling cutter is disclosed that comprises a rotatable adapter plate having a central protrusion on one side of the plate. A cutter ring, having recesses for mounting inserts therein, is provided with bayonet slots and a central opening so it can be fitted with and bolted to the adapter plate. The central protrusion is tapered and a conical grind is put on one of the mating surfaces between the adapter and the cutter plate to aid in disassembly after use of the milling cutter.

Abstract: A toolholder is disclosed consisting of a body having a recess extending inwardly from the periphery. The recess is formed having an inwardly extending front and back wall, defining a bottom wall therebetween. A shim is disposed in the recess with the back side abutting the back wall of the recess and being supported thereby, the shim having a protuberance on its front side for engaging a center hole of an insert. A pin member is imbedded in the bottom wall of a recess and located adjacent to, or in the region of, the front wall and means is provided for clamping the insert between the shim and bottom wall of the recess and the pin.

Abstract: A quick change device for mounting a tool in a support member such as a turret. The tool has a shank with radially outwardly movable balls therein and the mounting device includes a sleeve receivable on the shank and adapted for mounting in a bore in the support member. The shank includes an actuator ball causing the aforementioned balls to move radially outwardly and engage a shoulder at the end of the sleeve to pull the tool into a predetermined axial position and lock the tool in the aforementioned position while cooperating elements of key means in the tool in the support member prevent rotation of the tool in the support member.

Abstract: The specification discloses an insert tipped tool bit having grooves formed on the longitudinal periphery of the bit in the parent material supporting the insert and a method of reducing erosion of the insert supporting parent material by forming grooves on the longitudinal periphery of the tool bit and sizing and spacing the grooves so that earth fines can pack in the grooves and create a boundary layer of earth fines around the parent material.

Abstract: A comminution device having replaceable blade assemblies which are used, preferably, as stators. The blade assemblies can be replaceably affixed to the housing of the machine when used as stators or may be replaceably affixed to a rotating arm when used as rotors. The blade assemblies are comprised of a plug member that may have threads on part of its outer periphery in order to be threadedly connected to a stationary housing or rotatable member of a machine. A slotted portion is formed in the plug member and one end of a cemented hard metal carbide blade is disposed in said slotted portion. A collar is shrunk fit over the periphery of the slotted portion and provides the clamping force necessary to hold the blade in assembled relation to the plug member. Tapering cooperating elements of abutment are provided between the walls of the slot and the sides of the blade in order to urge one end of the blade into firm contact with the bottom of the slotted portion.

Abstract: Disclosed herein is a gripper jaw for a driving, extracting head. The gripper jaw is comprised of a block-like body of metal with a front face and a back face adapted for attachment to a power-driven arm. The front face has wear resistant compacts with one end imbedded in the front face and the other end of the compact protruding beyond the front face.

Abstract: A cutting insert having a central body portion and a plurality of cutting edge portions extending outwardly therefrom. The cutting edge portions of the insert are successively indexed into position while a special holder is provided to support the cutter in indexed positions thereof.

Abstract: An insert, especially a hard wear resistant insert, such as an insert of cemented hard metal carbide, for use in a mining tool or the like. The insert is especially adapted for being press fitted into the body of a mining tool or the like but may also be brazed or cemented therein. The insert has a rounded outer end and a flat inner end and tapers inwardly immediately adjacent the flat inner end and is rounded at the periphery of the flat inner end thereby eliminating stress risers in the insert and providing for easier insertion thereof into a bore in a tool body into which the insert is seated.

Abstract: A cutting insert, especially for milling cutters and the like, and which is to be mounted in a tool holder in a negative radial rake position. The insert is indexable and invertable and has a cutting edge means. The peripheral wall adjacent the cutting edge means has recesses therein which interrupt the cutting edge means. The depth of the recesses becomes shallower as the recesses extend away from the cutting edge means until the recess terminates in the peripheral wall. An insert having at least two cutting edges is described wherein the insert has at least two cutting edges and the recesses interrupting one cutting edge are staggered relative to the recesses interrupting the other cutting edge when the cutting edges are viewed in superposed relation.

Abstract: A clamping device, especially for clamping tools in a turret or the like, in which each tool is provided with radially outwardly movable clamp elements and an actuating element carried by the tool movable axially for actuating the clamp elements. The turret in which the tool is mounted includes mechanism for driving the actuating element in actuating direction and for releasing the actuating element from actuating position to release the respective tool from the supporting turret.

Abstract: A mounting structure for rolling cutter assemblies, especially gauge cutters, is disclosed wherein a saddle on a support structure is provided with a first sloping wall, a base portion joining said sloping wall and an abutment region facing the sloping wall. A wedge block is seated on the base portion of the saddle and has a second sloping wall facing and converging with the first sloping wall. The ends of the rolling cutter shaft have side walls that also converge and these side walls abuttingly engage the first and second sloping walls. Means are provided for holding and urging said shaft on to said saddle. The rolling cutter and shaft assembly may be easily removed by removal of the fastener means and wedge block. The disclosed saddle seat arrangement provides for an easy method of replacement of the rolling cutter assembly while the cutter head is still in the bore hole formation.

Abstract: A method and apparatus for installing chemical anchor bolt assemblies in earth formations comprising the step of abutting the end of the anchor bolt protruding from the earth formation with a predetermined force such that turning of the nut on the end of the anchor bolt will cause the anchor bolt to turn in the hole formation.

Abstract: A pick type mining bit with a cylindrical shank has a support block with a bore and a hard insert detachably and rotatably mounted in the bore. The insert has a bore for rotatably receiving the shank of the bit.The bit has a cylindrical working end projecting from the support block which tapers in at the tip and has a hard insert mounted in the tip. .Iadd .