Abstract: Methods and apparatus are disclosed for retaining components in a downhole motor in the event of a mechanical separation or failure of one or more components therein. As described, the retention mechanism does not require a threaded connection to components of the mud motor drivetrain. Downhole motor assemblies including the new catch mechanism also include a structural element to engage the catch assembly and the components to which it is attached in the event of a mechanical failure within the mud motor assembly.

Abstract: A grinding stroke control device for a valve stem grinding apparatus is fixed to a processing machine and provided for gripping a valve stem or a test bar. Using the hand wheel, the dial gauge and the positioning seat can obtain an initial position, then moving the measuring meter of the positioning mechanism along the transverse direction to make sure the valve stem has the right length with a standard valve clearance. By such arrangements, the grinding stroke control device for a stem valve grinding apparatus of the invention can have a less complicated structure and therefore is more convenient to operate.

Abstract: A clamping device for clamping a fastener, includes a clamping jaw, a first biasing member for biasing the clamping jaw, a clamping body having a central axis, a driving assembly for driving the clamping jaw to clamp the fastener, and a second member which can be driven by the first member to move axially relative to the clamping body so as to push the clamping jaw to clamp the fastener. The clamping body is formed with a notch for receiving the clamping jaw and the driving assembly is supported on the clamping body and includes a first member which can rotate and move axially relative to the clamping body. The installation structures between the clamping body, the driving assembly and the clamping jaw may be designed to be more compact so that the clamping device has a smaller size.

Abstract: In a cutting tool attaching and detaching apparatus of an ultrasonic vibration machining device, there are provided a collet attaching device and a collet removing device which can be separated from a shank and a collet.

Abstract: A chuck is provided for use with a manual or powered driver, such as a drill. The chuck has a body member with angularly disposed passageways formed therethrough. A plurality of jaws are slidably positioned within the angularly disposed passageways. The jaws grip upon a tool shank inserted into the body member. A nut is rotatably mounted on the body member and has nut threads defined on an inner circumference thereof in engagement with the jaw threads. A sleeve member is in driving rotational engagement with the nut whereby when the sleeve is rotated with respect to the body member, the jaws are also moved within the passageways. A rotational stop is defined between the nut and jaws wherein upon the jaws reaching a predetermined position within the passageways, further rotation of the nut in an opening direction is prevented. The stop comprises a radially extending surface defining an end of the nut threads. The radially extending surface contacts a side surface of at least one of the jaws.

Abstract: A chuck for use with a manual or powered driver having a drive shaft is provided. A generally cylindrical body has a forward section and a rearward section, the rearward section adapted to mate with the drive shaft of the driver. A gripping mechanism is actuatable to a closed position in which the gripping mechanism axially and rotationally retains a tool with respect to the body and to an open position in which the gripping mechanism does not so retain a tool. An annular nut is disposed about the body and has a threaded portion in threaded engagement with the gripping mechanism so that rotation of the nut about the body in a closing direction actuates the gripping mechanism to the closed position and rotation of the nut in an opening direction, opposite the closing direction, actuates the gripping mechanism to an open position.

Abstract: A combination of a tool holder and a tool. A tool holder having radially movable gripping members defining an axial tool shank receiving passage therebetween. A tool having a shank portion received in the shank receiving passage of the tool holder. The gripping members and the shank portion of the tool defining cooperating male and female retainers for releasably retaining the shank portion of the tool within the shank receiving passage of the tool holder. The female retainer comprising an annular channel for receiving the male retainer therein; and the gripping members of the tool holder and the shank portion of the tool comprising cooperating first and second torque transmission surfaces, respectively, for transmitting a driving torque from the tool holder to the tool so as to rotate the same about its longitudinal axis.

Abstract: A quick release chuck device includes a body member and a device for attaching the body member to a drive spindle. A chamber in the body member receives a conventional collet. Thread grooves are defined on the outer circumferential surface of the body member. An operating sleeve is rotatably mounted on the body member and includes thread grooves defined on the inner circumferential surface. Rolling bodies are received in the thread grooves of the body member and sleeve member wherein the sleeve member is axially movable relative to the body member upon rotation of the sleeve member through engagement of the rolling bodies in the thread grooves. The sleeve member imparts a force to the collet in the chamber causing the collet to grip upon a tool shank carried therein.

Abstract: A chuck mechanism is described, which is easy to handle with a chuck clamping handle of increased diameter and is capable of achieving smooth movement of its reciprocally movable portion of reduced weight and assures safe operation with the least exposure of outwardly moving portion. Rotating a knurled portion of a body case rotates an intermediate transmission member which in turn rotates a slide shaft stopping member to tighten or loosen its engagement with a slide shaft, causing clamping or releasing of a collet chuck. The slide shaft, slide shaft locking member, chuck and a saw can reciprocally move as a single unit.

Abstract: Attachments for self-locking or conventional key-operated chucks on hand drills make possible simplified operation thereof. An externally threaded ring carried by the drill surrounding the chuck is internally beveled at its outer end and mates with a threaded nut. A split ring with wedge-shaped cross section is positioned between the nut and the beveled end of the ring so as to clamp the chuck to the ring when the nut is tightened. A cap made of an elastomer attached over the nose of the chuck has in its end a slot or crossed slots which grip a drill bit when it is thrust therethrough.

Abstract: A chuck assembly and collet for retaining a commercially-available large-diameter, high-torque end mill (or similar) tool against axial pullout and against radial (or rotational) movement with respect to the assembly. The tool includes two axially spaced flat surfaces along the shank, one of which is coupled to the collet to prevent axial pullout and the other of which is coupled to the chuck to prevent rotation with respect to the chuck. The coupling to the chuck is accomplished by a ballclamp screw which extends through an aperture in the collet to the flat surface on the tool. The ballclamp screw has a flattened ball that is pivotally mounted in the screw's engagement and the pivotal mounting accommodates a few degree misalignment between the shank's flat surface and the screw without significantly affecting the coupling therebetween.

Abstract: A bi-directional, self-tightening chuck for releasably gripping a tool bit such as a twist drill or the like includes a bit receiving nosepiece having a conical, internal opening formed therein. A control sleeve is rotatably mounted, through a thrust bearing, on the nosepiece and is adjustably connected to a chuck body to enable adjustment of the axial position of the nosepiece relative to the chuck body. Tapered gripping elements, which may take the form of cone-like gripping rollers or wedge-like jaws, are located in the internal opening of the nosepiece and are adapted to forcibly grip the stem portion of the tool bit in response to a hand-tightening adjustment of the control sleeve on the chuck body and further adapted to self-tighten in response to an axially directed thrust force applied to the gripping elements by a torque-responsive cam assembly.

Abstract: A bi-directional, self-tightening drill chuck suited for surgical and other medical applications in accordance with the present invention includes a chuck body having an internally tapered opening at one end that is defined by first and second cam surfaces and a central, longitudinally extending cannula or passage formed through the length of the chuck body. A plurality of tapered gripping rollers are located within the opening and are resiliently urged against the cam surfaces throughout a range of adjustment by a spring retainer which includes rearwardly extending spring arms.

Abstract: A tool chuck, especially for holding tool bits, for example twist drills, and for use with a machine tool, in particular a portable electric drill. The chuck is so constructed as to permit secure holding of the tool bit even when used in percussion drills or impact hammer drills, while at the same time providing protection for the elastic internal element which provides axial movement. The tool chuck has a core or mandrel surrounded by a hollow conical collar which includes at least two chuck jaws and the elastic member is located between the core and the collar to apply an axial force between these two parts when the chuck is closed on a tool bit while being protected against direct exposure to the impacts sustained by the chuck jaws.

Abstract: A chuck assembly and collet for retaining a commercially-available large-diameter, high-torque end mill (or similar) tool against axial pullout and against radial (or rotational) movement with respect to the assembly. The tool includes two axially spaced flat surfaces along the shank, one of which is coupled to the collet to prevent axial pullout and the other of which is coupled to the chuck to prevent rotation with respect to the chuck. The coupling to the chuck is accomplished by a ballclamp screw which extends through an aperture in the collet to the flat surface on the tool. The ballclamp screw has a flattened ball that is pivotally mounted in the screw's engagement and the pivotal mounting accommodates a few degrees misalignment between the shank's flat surface and the screw without significantly affecting the coupling therebetween.

Abstract: A keyless chuck adapted to grip an object, such as a drill bit, is disclosed. The keyless chuck includes a cylindrical body provided with an axially extending tapered bore. The surface of the tapered bore includes first and second cam surfaces. A control sleeve is provided surrounding at least a portion of the cylindrical body and is adapted for controlled axial movement relative to the cylindrical body. A retaining element is attached to the control sleeve and partially closes one end of the cylindrical body. A thrust bearing is provided in the retaining element. Gripping elements are positioned within the tapered bore and are adapted to engage and grip the tool when the tool is inserted between the gripping elements. A thrust bearing is positioned in the retaining element which operatively engages the gripping elements.

Abstract: A chuck assembly and collet for retaining an end mill tool against axial pullout. The collet includes a radially compressible body having a tapered outer surface, a central bore and a radial aperture extending from the outer surface into the central bore. The radial aperture, which includes larger and smaller diameter portions, has a movable pin mounted therein and adapted to extend into the bore to retain the tool. The pin has an undercut portion, with a spring or snap ring mounted around the pin in the undercut portion, said spring having a free diameter slightly larger than the larger diameter to provide a pressure fit when mounted therein.

Abstract: A chuck for use in fastening a replaceable tool such as a drill to a rotatable shaft and particularly to a rotatable shaft powered by a motor. The chuck is in the form of a cylindrical housing formed with a taper at the tool end. A plurality of jaws, each formed with a convex or tapered surface are mounted in the tapered section of the housing with the convex or tapered side bearing against the inside tapered wal of the housing. A center pin is mounted in the housing with a first end of the pin bearing against the end of each jaw, such that motion of the pin towards the jaws forces the jaws against the tapered housing wall to close the jaws together. A cross-pin is transversely fixed through the center pin and extends through slots in the housing wall, with the slots oriented parallel to the axis of the center pin to permit both axial motion of the pin in the housing and rotation of the pin relative to the housing.