Abstract: A cutting tool assembly wherein a replaceable cutting insert is clampingly held between a pair of clamping jaws of an insert holder which are respectively provided with pairs of clamping surfaces one pair of clamping surfaces being of uniformly curved cross-sectional shape, while the other pair of clamping surfaces being of non-uniformly curved cross-sectional shape; the arrangement being such that when the insert is clamped between the jaws the respective clamping surfaces contact each other along discrete, axially directed locations which are symmetrically disposed with respect to and axially spaced from a median plane of the insert.

Abstract: A cutting insert comprising three or more upheaved portions having a height of 0.01 to 0.1 mm on at least one rake surface of the insert. The cutting insert can be stably secured by the support effect of the upheaved portions. In addition, stress concentration due to cutting impact does not occur and generation of breakage is reduced greatly, whereby even the cutting chip warped by case-hardening can be used for cutting without grinding.

Abstract: A tool holder for a small screw machine box tool, having a uniform diameter for easy removal and a carbide insert both useable in either right or left hand box tools.

Abstract: The invention relates to a tool for chip removing machining and a blade therefor. The tool comprises a holder, an elongated blade and an insert. The holder is provided with an expandable securing part and a head having a longitudinally recess arranged to receive the blade. The blade has an insert site which receives the insert. The blade is provided to be wedged up in the holder in the longitudinal direction of the blade and in two directions perpendicular thereto.

Abstract: A clamping arrangement for clamping a pin mounted cutting insert on a tool holder by means of a plurality of clamping balls located within a ball guide groove formed in the tool holder and displaceable into a clamping abutment with the insert by means of a ball displacing member articulated to the tool holder.

Abstract: A stick tool construction in which the cutting tip is easily and readily replaceable from the body. The cutting tip has a through hole and a fastening arrangement is provided passing through the hole in the tip. The fastening arrangement includes a cupped member supported by a spring on one side and a retaining screw on the other side of the body.

Abstract: A tool holder for holding a replacable tool bit having a body part and a cutting edge, the tool holder having a body provided with first and second clamping members which co-operate, in the use, to clamp the tool bit to the body, the first clamping member having a tool bit engageable portion for engagement with the body part of the bit, a fulcrum portion in engagement with the tool holder body and a load applying portion whereat a load is applied to the first clamping member to cause the member to pivot about the fulcrum and so urge the bit, in use, towards the second clamping member. In one version the tool bit is of polygonal shape in side elevation and has a cutting edge at each corner of the polygon, so that a selected one of the cutting edges may be brought into an operative postiion relative to the tool holder by rotating the bit about the first clamping member so that the selected edge is presented to a work piece for cutting engagement therewith.

Abstract: An improved cutting insert with chip control features and a method for manufacturing the same. An insert body having wall regions, sides and top and bottom walls is adapted for mounting in a pocket in a holder. The insert body has cutting edges and a diagonal notch in the top and bottom sides. A land region extends rearwardly from the end wall region toward the respective top or bottom wall and defines a surface region of a predetermined width. A descending wall initiates in a portion of the land and terminates in a planar floor region having a forward, a rearward and opposed side edges. A back ramp extends upwardly from the planar floor rearward edge and terminates at the respective top or bottom wall. The end wall region can include at least one flat land region adjacent the land region. The flat land region defines a selectively removable portion of the end wall region and after any selective removal thereof represents no more than approximately one-third of the total width of the end wall region.

Abstract: A tool assembly for mining machines and particularly for coal planes or coal cutting machines comprises a cutter which has a shank portion which is engaged to a seat of a size comparable to the shank portion of a cutter holder and it is held in that position by a locking pin which extends through aligned bores of the holder and the shank portion which may be retracted into a knockout slot defined in the shank portion which is closed on each side by a portion of the cutter holder in an arrangement in which the locking pin may be retracted into the knockout slot for removal of the cutter.

Abstract: Single or multiple recessing tool with cutting plates loosely mounted in an opening of the holder with the cutting plates, possibly using shortened gage block-like supplemental plates, clamped against the bottom and one side wall of the opening by means of an essentially L-shaped mounting frame overlapping the plates of the plate package from above and one side with a clamping pressure component being produced when clamping the mounting frame against the bottom via a wedge ramp lateral to the side wall and with adjusting ribs being arranged on the bottom of the opening and/or the bottom side of the upper clamping leg of the mounting frame engaging into the fitting grooves of all of the plates.

Abstract: A cutting tool provides a cutting insert receiving slot with a retaining lip to engage a face of the insert and prevent movement normal to its face. The insert has a centrally disposed keyway extending fully across one face. In one embodiment the lip engages the keyway; in another embodiment a locating pin engages the keyway to prevent longitudinal movement of the insert relative to the holder.

Abstract: A keeper spring for mounting a rotatable mining tool in the bore of a supporting block is formed of a unitary, metallic spring material, and includes a cylindrical member which is split along its axial length so as to be radially expansible and contractable, thereby defining a first spring portion. Three, equally spaced elongated arcuate, leaf spring protuberances project radially outwardly of the central region of the cylindrical member and are aligned with the axial length of the cylindrical member. Each protuberance is formed by providing two parallel slits in the wall of the cylindrical member, after which the material intermediate the slits is indented outwardly so as to effectively define a second spring portion.

Abstract: In a percussive rock bit or similar tool wherein cemented carbide cutting inserts are retained in open radial slots in the head of the tool, an improved method of mechanically retaining the inserts. The inserts are provided with a plurality of elongated radially aligned serrulations along each flank thereof, the thickness of the insert as measured between the crests of opposing serrulations being such as to provide a substantial interference with the slot wall. The inserts may be cold fitted by sliding along the slot, following which body material is peened so as to overlay a small chamfer at the base of the outwardly facing wall of the inserts. The inwardly facing walls of the inserts may be inclined so as to retain the center plug of the rock bit mechanically.

Abstract: An indexable insert for cutting internal and external grooves in a workpiece is adapted for mounting and securing upon a tool holder having a pocket therein; whose bottom edges define an obtuse angle. The insert comprises an elongated body of rectangular cross section having a flat top surface along one edge of the body and a pair of angular bottom surfaces extending from a central point of the body and inclined toward and extending to said top surface at a corresponding included obtuse angle. These inclined surfaces define a pair of separately usable transverse cutting edges at the opposite ends of said body which is adapted for snug registry within said pocket. Said pocket also defines within the tool holder a back up plate against which the insert bears. The insert, one or more, is held down within said pocket by a clamp which bears across the top edges of said inserts. A cam lock device is also mounted upon said holder to apply lateral pressure to the insert holding it snugly against the back up wall.