Abstract: A method and apparatus for a self compensating and geometrically centering jaw type chuck for engaging and retaining a workpiece, particularly an asymmetric workpiece, wherein a geometric center of the workpiece is aligned with a rotation axis of the chuck. The chuck includes two opposing jaws each of which is rotatable about a pivot pin extending from a radially adjustable jaw slide. Each jaw includes an outer end that is slidably and rotatably coupled to a rotatable ring symmetrically disposed about the rotation axis by a synchronizing pin having a first end rotatably disposed on the rotatable ring, and a second end, slidably engagable with the outer end of the jaw. The rotation of one jaw about the pivot pin rotates, in synchronism, the rotatable ring and the other jaw to maintain the geometric center of the asymmetric workpiece in alignment with the rotation axis of the chuck. The jaw slides are radially adjustable to open and close the jaws by reciprocating a piston along the rotation axis of the chuck.

Abstract: A chuck includes a body having a vertical chamber for slidably receiving a plunger and having a lateral channel for slidably receiving a pair of jaws. The plunger includes a pair of inclined slots for slidably engaging with a pair of inclined extensions extended from the plunger such that the jaws may be moved toward each other or moved away from each other when the plunger is moved along the chamber. The slots include a cylindrical and smooth inner surface and the extensions each includes a cylindrical and smooth outer surface such that the extensions and the slots may be easily manufactured.

Abstract: This disclosure is directed to a chuck system for a machine tool such as a lathe. It incorporates an elongate cylindrical body which terminates in a set of collet fingers having enlargements at the detail end whereby the enlargements define a circular body. The circular body is divided by slots to form collet fingers with enlargements at the ends of the collet fingers. A circumferential groove is formed having a registration shoulder for all of the lock jaw segments. Each lock jaw segment has a protruding tab. The tab is locked by positioning against the face of the groove and is registered against movement by jamming against a transverse post in the groove which shoulders against a conforming notch on the locking tab. A set screw holds the components in fixed location, and release is accomplished by unthreading the set screw.

Abstract: A chuck for holding a workpiece in a machine such as a lathe including a jaw holder having a front side facing in the direction of the workpiece and radially extending slots in this front side. There is a mechanism for attaching the holder to the machine for turning about a central axis. Several jaw devices are detachably mounted in these slots and are radially movable therein. Each jaw device has an inner workpiece engaging surface that forms a profile when it is viewed from the front of the jaw device in the direction of the central axis. This profile comprises a central concave arc and two similar convex curves located at opposite ends of the concave arc. In a preferred version, the chuck is a scroll chuck having a scroll member rotatably mounted in the holder. The workpiece engaging surfaces can be serrated to increase gripping ability.

Abstract: A jaw assembly for use with a lathe chuck which is rotatable about an axis and provided with at least two first cooperative mating portions circumferentially spaced apart about the axis. The jaw assembly includes at least two cylindrical bodies. Each body has a longitudinal axis, a cylindrical outer surface and first and second spaced-apart generally parallel outer planar surfaces disposed in planes generally perpendicular to the longitudinal axis and to the cylindrical outer surface. Each body is adapted to have at least three circumferentially spaced-apart workpiece-receiving cutouts therein extending through at least the outer cylindrical surface and the first planar surface. Each body carries second cooperative mating portions for mating with the first cooperative mating portions of the chuck to secure the body to the chuck so that the body rotates in an immovable manner with respect to the chuck. The bodies are mountable with respect to the chuck to rotate therewith in at least three different positions.

Abstract: A jaw assembly is provided for chucks. The assembly includes a master jaw mounted to a chuck for movement toward and away from the rotational axis. The master jaw includes a plurality of stepped apertures extending into the front face and parallel to the rotational axis. Each stepped aperture defines a mounting seat adjacent the front face and a threaded portion extending rearwardly from the mounting seat. Mounting buttons include stems that are press-fit into the mounting seats of the master jaws. Frustums project from the stems and away from the front face of the master jaw. The mounting buttons include apertures extending entirely therethrough and registered with the threaded portion of the stepped aperture in the master jaw. A top jaw is mounted to the front face of the master jaw. The top jaw has a plurality of apertures extending therethrough and registered with the apertures through the mounting buttons.

Abstract: Polyvalent clamp chuck for machine-tools comprising a cylindrical chuck body in the front face of which are radially guided at least two gripping jaws that can be brought together or separated by drive means by the axial withdrawal or advance of an internal control cylinder concentric with the chuck. The control cylinder is provided at its front end with a connector member, for instance in the form of an inwardly directed gripping flange for additional fitted support means. The coaxial front opening of the chuck has a conical part whose summit is oriented rearwards. The chuck further comprises means for selecting the maximum amplitude of displacement of the control cylinder.

Abstract: A chuck for driving drill bits an the like having shafts of hardened steel is provided with clamping jaws which at least at their clamping surfaces have a coating of diamond dust, so that they will have a resistance to abrasion that is greater than that of hardened steel. The diamond dust can embed itself in the clamping jaws. The entire chuck jaw may be made with a material having that property or one or more clamping parts of the jaw may be made of such a material, or the coating may be provided on a part of the chuck jaw or on the clamping parts.

Abstract: A precision chuck has a chuck body, top jaws movable radially with respect to a center axis for gripping and releasing a workpiece, master jaws slidably mounted in recesses in the chuck body for radial movement with respect to the center axis and fixedly connected to the respective top jaws, jaw actuators movable linearly parallel to the center axis having inclined cam surfaces slidingly engaged with corresponding surfaces on the master jaws, and an air-operated piston or power bar for moving the jaw actuators. Each of the jaw actuators is positioned at the middle of a respective master jaw and has a pair of spaced-apart actuator leaves engaging opposite sides of the width of the master jaw, thereby applying a balanced driving force to the master jaw without torquing. Further, an improved mounting employing a combination of threaded screw and concentric tubular pin is used to connect the top jaw to the master jaw.

Abstract: Disclosed is a method of working a semi-finished scroll member for a scroll compressor which has a circular end plate having a first end face and a second end face with a spiral wrap extending therefrom. Before the second end face and the wrap are machined, the outer peripheral surface of the end plate is formed therein with a circumferencial groove to provide jaw finger engaging surfaces spaced from the first and second end faces of the end plate. Then, radial grooves are formed in the outer periphery of the end plate such that each groove extends between and is open in one of the jaw finger engaging surfaces and in the first end face of the end plate. Thereafter, the semi-finished scroll member is positioned relative to a machine tool such that the first axial end face of the end plate is placed adjacent a back-up member of the machine tool.

Abstract: A clamping chuck comprising a body (1) having a front face provided with radial cuts (3), and jaw holders (4) carrying clamping jaws and sliding in said radial cuts, each side face of the jaw holders carrying at least two slideways, preferably 4 to 8, interacting with a corresponding number of slideways provided on the side faces of said radial cuts, the slideways being so flexible that all the slideways take part in the guiding of the jaw holder in spite of possible machining tolerances.

Abstract: A chuck jaw is provided for holding an irregularly-shaped object such as a differential housing on a lathe. A chuck jaw body which is pivotally mounted to each chuck mounting block to pivot about an axis substantially tangential to a cylinder defined around the turning radius of the lathe. A first end of the chuck jaw body extends radially further in than a second end of the chuck jaw body, so that the first end can engage a radially smaller part of the irregular object, while the second end engages a radially larger part. Springs and adjustment screws preferably are provided to allow adjustment of the initial angle of the first and second ends.

Abstract: Apparatus for forming the bolt openings and/or the center-pilot opening in a vehicle wheel that includes a circumferential array of locating jaws for engaging and locating the rim portion of the wheel. An upper die is reciprocable for forming at least one mounting opening on a first axis in the disc portion of a wheel engaged by the locating jaws. The locating jaws are movable between a first or outer position, and a second or inner position radially inward of the outer position and in which the locating jaws engage the rim portion of the wheel positioned within the locating jaws. A ring mechanism surrounds the first axis and is disposed for radial abutment by the mechanism for moving the locator jaws at the second or inner position of the locator jaws so as to define the second or inner position of the locating jaws concentrically with each other on a second axis, which may be either concentric with or eccentric to the first axis.

Abstract: A biscuit joiner 11 has a pair of selectively usable retractable antiskid pin subassemblies 13, 15 for increasing the frictional resistance of the shoe assembly 23 with a workpiece when making a cut in the workpiece. Pins 19, 21 are biased forwardly to an extended position by a spring 45. To permit selective use of the pins 19, 21, a retractor 47 retains pins 19, 21 in a retracted position. Retractor 47 preferably comprises a cam 59 and a cam follower 61 and is actuated and deactuated by rotation of pins 19, 21 within chambers 43. Each pin tip 55 has a plurality of peripheral points 73-76 which are particularly effective for reducing skidding on a workpiece.

Abstract: A segmented adjustable top jaw (25) capable of being mounted upon a chuck has a slot (100) partially extending the length of the jaw (25) and defining a body inner portion (105), a body outer portion (110) with a gripping surface (30), and a hinge (115) therebetween. Upon mounting the body inner portion (105) to the lathe, concentricity among cooperating top jaws (25) may be provided by deflecting the body outer portion (110) toward or away from the body inner portion (105) about the hinge (115), thereby causing the gripping surface (30) of the jaw (25) to rotate about the hinge (115) resulting in an upward or downward movement of the gripping surface (30).

Abstract: An adjustable top jaw is provided which is attachable to a master jaw which is in turn attached to a chuck of a lathe or similar machine. The top jaw comprises a base segment, top segment drive block and a lead screw. The base segment is mountable on the master jaw. A lead screw aperture extends entirely through the base segment. A drive block slot extends downward from the top of the base segment into the base segment a distance below the lead screw aperture. The drive block is located within the drive block slot and has a first aperture extending therethrough colinearly with the lead screw aperture. The lead screw is located within the lead screw aperture and drive block aperture. The top segment is attachable to the base segment and has a drive block channel for receiving a part of the drive block. The rotation of the lead screw causes the drive block to move forward or backward thus moving the top segment forward or backward in accordance with the movement of the drive block.

Abstract: This invention relates to diamond drills drive apparatus and in particular, to an improved diamond drill chuck jaw carrier and related assembly. The apparatus comprises a hydraulically operated vane motor concentrically mounted about the axis of rotation of a drill rod string for rotating two independently driven chuck jaw carrier assemblies about the axis. Each chuck jaw carrier assembly receives the rod string within a central aperture and comprises floating chuck jaw wheel assemblies and flying wedge assemblies. The flying wedge assemblies slidably force the chuck jaw wheel assemblies into removable engagement with the drill pipe. The chuck jaw wheel assemblies further comprise hydraulically operated vane motors driving tiers of chuck jaw wheels. The chuck jaw wheels have toothed surfaces for gripping engagement of the drill pipe.

Abstract: One method of the present invention provides a method of connecting a flange to a cylinder. This method includes securing the cylinder in a first chuck of a lathe and securing the flange in a second chuck of the lathe. The method also includes rotating the first and second chuck such that the cylinder and flange are rotated while bringing an end of the cylinder and the flange in proximity of a heating element associated with the lathe contemporaneously with the rotating step. Finally, there is the step of bringing the end of the cylinder in contact with the flange. Novel apparatus consistent with the present invention are also disclosed.

Abstract: Each of the jaws of a sliding jaw chuck are moved between workpiece clamping and release positions by a post, the end of which, in active position, is seated in an opening in an octogonal plate seated in a recess in the jaw. The plate is octagonal and its dimensions are such that it always entirely occupies the recess in the direction of movement of the jaw. In contrast, the recess is wider than the plate, permitting the plate, after removal from the recess, to be rotated about the post to any one of five positions. While the plate is symmetrical about its geometric center, the opening for the post is offset from the plates's center which results in changes in the spacing between the post and the ends of the recess, which controls the radial position of the jaw with respect to the axis of rotation of the chuck and thus the size of the workpiece which it can clamp.

Abstract: An improved scroll chuck for holding a workpiece in a lathe including a jaw holder having a front side and a rear side, radially extending slots in the front side and means for attaching the holder to the lathe for turning about a central axis. Two or more jaw devices are mounted in the slots and are radially movable therein. A scroll member is rotatably mounted on the holder and has a spiral-shaped rib formed on a front surface thereof. This rib extends along recesses formed on the jaw devices whereby rotation of the scroll member causes the jaw devices to move in the radial direction. A pin member is arranged on one of the jaw devices and extends from a rearwardly facing surface of the device and into an elongate recess formed in the holder. This pin member prevents the jaw device from accidentally disengaging from the holder.

Abstract: A chuck jaw is provided having a pivotally mounted gripper mounted to the base jaw. Each end of the gripper serves as a chuck point, so that a three-jaw chuck can be used to provide six chuck points. Preferably, rollers are provided at each chuck point of the gripper to ensure even distribution of forces around the workpiece. In addition, spring plungers preferably are provided to limit the degree of pivoting of the gripper relative to the base jaw when a workpiece is not mounted on the chuck.

Abstract: In an adjustable chuck for gripping workpieces of different sizes, three jaws are mounted for relative movement. A hydraulically driven mechanism is operable selectively for closing the jaws to grip a workpiece and for opening the jaws to free the workpiece. Two strain gauges on one of the jaws sense the gripping force applied by the jaws to the workpiece. A computer, which responds to the strain gauges, coacts with a control relay and with hydraulic valves to control flow of hydraulic fluid into and from the closing and opening mechanism. A system comprising a plurality of such chucks is contemplated, in which one computer coacts therewith to control the closing and opening mechanism of any selected chuck of the system, and which adjusts itself for minor variations among the system chucks.

Abstract: A chuck having at least one jaw assembly that is radially displaceably guided in a chuck body and comprises a driving jaw and a clamping jaw. A coupling member is mounted in the driving jaw in such a way as to be displaceable at right angles to guides provided in the chuck body for the jaw assembly, with the coupling member being displaceable between an uncoupling position and a coupling position in which the coupling member is in positive engagement with a back side of the clamping jaw. An eccentric unit is rotatably mounted in the driving jaw for effecting the displacement of the coupling member, with the eccentric unit having a nonconcentric shaft that is disposed in a transverse slot of the coupling member.

Abstract: A boregrinding chuck assembly includes a plurality of arrow-shaped jaws that each includes a head that is in the shape of an isosceles triangle with the apex angle thereof just slightly less than 360.degree. divided by the total number of jaws in the assembly so that there is a small gap defined between adjacent jaws when such jaws are holding a workpiece in position for a boregrinding operation. Each jaw includes a set of marking lines that are located to define a workpiece-engaging circle that has a diameter just slightly smaller than the outer diameter of the workpiece to securely hold such workpiece when all of the jaws are engaged against the workpiece. The jaws are customized by cutting the heads along the marking lines that are appropriate to the particular workpiece.

Abstract: A top jaw system for securing a top jaw in position above a chuck on a milling machine, lathe or the like is provided. A protrusion extends upward from the chuck and is preferably attached to the chuck by rigid attachment to a jaw nut which is positioned in a common master jaw on the chuck. The protrusion has a flat face which extends upward and over the jaw nut to form an acute angle with the jaw nut. A top jaw having a slot sized to receive the protrusion is placed over the protrusion. The top jaw has a pin aperture extending through the top jaw through the slot at a right angle to the protrusion when the top jaw is placed on the protrusion. When the top jaw is placed on the protrusion, an elongated pin having a flat surface extending along its elongated axis is placed in the pin aperture. The flat face of the protrusion is pushed into contact with the flat surface of the pin. This is preferably done a set screw extending through the top jaw and contacting the protrusion opposite the flat face.

Abstract: The master jaw assembly comprises at least three jaw members adapted to be mounted to a chuck, a collet adapter which is received within the jaw members and in an opening in the chuck, and a selected collet received and releasably fixed within the collet adapter.

Abstract: A chucking device is provided that has displaceable base jaws that can be coupled with attachment jaws via respective one-piece securing bars that are axially supported and radially displaceably guided in a guide slot of the attachment jaw and an inclined guide slot of the base jaw. To effect radial shifting of the securing bars, an adjustment pin is disposed in the base jaw parallel to the guide slot thereof and is in operative connection with the securing bar via an undercut.

Abstract: A chuck jaw changer for a machine tool has a jaw changing arm which is swingable about a vertical rotating shaft. The two ends of the arm have elongated magazine holders extending transversely to the length of the arm. The magazine holder has a guide groove in which an elongated jaw magazine is fitted slidably along the length of the holder. The magazine is formed with a plurality of jaw storage grooves spaced apart from each other and chuck jaws are detachably accommodated in the storage grooves, respectively. When the jaw changing arm is indexed to position the magazine holder into registry with the jaw mounting groove of the chuck, one of the jaw storage grooves of the magazine is brought into alignment with the jaw mounting groove so that a jaw changing device operates to shift the jaw between the storage groove and the jaw mounting groove for changing the jaw.

Abstract: A top jaw assembly is adapted to be mounted on the master jaw of a chuck and includes a replaceable work holding pad. The top jaw assembly includes a top jaw formed with a first support surface lying in an axial plane and a second support surface bored concentric with the central axis of the chuck. An arcuate shape work holding pad having concentric inner and outer surfaces is provided for gripping the work piece. The outer surface is adapted to seat against the second support surface of the top jaw assembly and the inner surface is adapted to grip the work piece. Clamping means are provided which include a locking element adapted to engage the work holding pad. The locking element urges the work holding pad downwardly against the first support surface of the top jaw to axially locate the pad and rearwardly against the second support surface to maintain the inner surface of the pad concentric with the central axis.

Abstract: A method is described for assuring concentricity of a gear's pitch circle with its axis, the pitch circle having a non-constant radius about the axis. The method comprises the steps of: determining the gear's pitch circle and its position of maximum radial offset from the gears axis; positioning the gear in a chuck having a plurality of simultaneously movable jaws, the chuck having an axis which is continually concentric with respect to its jaws as they move, the position of maximum radial offset being positioned adjacent a chuck jaw so that when the jaws are moved to grip the gear, the axis of the gear is offset from the chuck axis by action of the jaws on the gear; placing the chuck and gripped gear in a machine tool adapted to machine the gear concentrically with the chuck's axis; and operating the machine tool to remove sufficient material from the gripped gear to bring the gear's axis into concentricity with the gear's pitch circle.

Abstract: Disclosed is a claw unit with paired separably connected claw elements, which comprises a chuck body, a master jaw, a top jaw, position-limiting members, a locking member, and an engaging member. When the engaging member is rotated, the locking member which is in engagement with the engaging member is retreated into the master jaw from a front surface thereof. Thereafter, the top jaw is forced into the front surface of the master jaw. When the top jaw has been thus brought into engagement with the position-limiting members and further into contact with the front surface of the master jaw, the top jaw is moved somewhat in a radial direction of the chuck body. When, in this state, the engaging member is rotated, the locking member which has been elastically urged is allowed to rush into a positioning hole of the top jaw to lock the top jaw. Thus, the top jaw is made integral with the master jaw.

Abstract: The invention relates to a clamping chuck. The clamping parts of the jaws are connected to support pieces sliding radially inside the body by means of bolts sliding axially inside these support pieces and provided with teeth.An axially sliding operating ring causes the jaws to clamp by acting on the support pieces by means of levers for example. The bolts are operated by actuating members.To avoid undesired clamping when the clamping parts are disassembled or adjusted, means lock the operating ring when an actuating member is in the position corresponding to retraction of the bolt, preferably before this retraction can be performed.

Abstract: A jaw assembly includes a master jaw and a work clamping jaw bolted to the master jaw. The master jaw is formed along its axis with a cylindrical bore and in its top surface with an elongated hole having a width smaller than the diameter of the cylindrical bore and communicating with the cylindrical bore. At least one cylindrical seating nut having a diameter slightly smaller than that of the cylindrical bore is inserted therein. A fixing bolt is put through the work clamping jaw and the elongated hole of the master jaw and screwed into a threaded hole formed in the seating nut. The master jaw and the work clamping jaw can be coupled together in a position relative to each other that is adjustable by tightening the fixing bolt.

Abstract: A system is provided for the rapid change, among others, of clamping jaws on a machine-tool which comprises self-blocking means for locking a jaw for clamping a workpiece from the inside or a jaw for clamping a workpiece from the outside. The jaw-holder is provided with at least two bearing portions for said jaws, the bearing faces being slanted through an angle .alpha. and .gamma. respectively. These faces cooperate in the blocked position with corresponding bearing faces of the jaws. One of the ends of an assembly has a face slanted through an angle .beta. whereas another face is slanted through an angle .delta.. These faces cooperate in the blocked position with a corresponding bearing face respectively of one of the jaws.

Abstract: A lock ring device for locking the soft jaws of a lathe chuck or the like at a desired position for the machining of the work engaging surfaces of the soft jaws, the device being adjustable to position the jaws in the locking position for the exact amount of metal removal desired. The device is designed for use with the standard soft jaws in use today.

Abstract: The clamp jaws radially adjustable by a drive member each comprise a jaw base guided in the chuck body and a mounted jaw member replacably attached with it as well as at least one connecting pin which is mounted pivotable about the pin axis in the jaw base. According to rotary position the attachment between the jaw base and the mounted jaw member is released or locked. At least one control rod guided longitudinally slidable in the jaw base is coupled with the connecting pins by gear teeth so that the motion of the control rods relative to the jaw base converts to a rotation of the connecting pin and vice versa. The feed of the control rods in the jaw base runs parallel to the feed of the jaw base in the chuck body. For the control rod a controlling member is provided by which the control rod is held fixed from motion relative to the chuck body. The jaw base is slidable for rotation of the connecting pins by its drive member with the control rods held fixed in position.

Abstract: In a lathe chuck, the jaws consist of two jaw segments, couplable with each other in different relative positions by means of a coupling member operatively linked to an actuating member by way of a positioning assembly. A latching assembly is provided for fixing in place the forward jaw part while the rearward jaw part is being moved. The latching assembly, the actuating member, and the positioning assembly are all adjustable in a linked relation to one another, so that the chuck span of the chuck jaws is automatically adjustable by the actuating member.

Abstract: A lathe chuck includes three jaws each comprising a reciprocating jaw member to which an indexible, hexagonal, soft metal clamping member is detachably secured. Each jaw member has a raised portion which engages in a recess in the underside of the clamping member. Each jaw member also has an upright pin located at a leading edge of the jaw member, which engages in one of six slots formed in the peripheral surfaces of the recess and each aligned with a respective corner of the clamping member, thereby providing correct indexing of the clamping member.In another embodiment of the invention, two oppositely-facing leading edges are provided, so that they can be used for clamping against the inner surface of a tube or the outer surface of a bar, respectively.

Abstract: The invention contemplates an improved drill-bit construction wherein the shank by which the bit is clamped is characterized by (a) three angularly spaced grooves which are continuous over their entire length of engageability to the jaws of a multi-jaw chuck, (b) at least one of the grooves being closed at its rear end, (c) the rear end of the closed-end groove is at no greater offset than 5-mm from the rear end of the bit, and (d) the diameter of the cutting part of the bit shank is greater than the diameter of the clamping part of the shank, to an extent which at most results from shaped formation of the chip-removal groove.

Abstract: In chucking, a workpiece is clamped while drawn to the chuck body for positive contact of the workpiece to stoppers, whereby a degree of machining accuracy is remarkably improved.

Abstract: A workpiece holding assembly for use on a chuck includes a chuck jaw and an adjustable self-centering workpiece holder. The chuck jaw has an elongated body with opposite ends, a groove defined in one end of the body, and a pair of arcuate recesses formed in the one body end on opposite sides of the groove. The workpiece holder includes a shaft portion and a base portion attached about a midsection of the shaft portion such that the holder has an integral, one-piece construction. The shaft portion is of generally cylindrical shape adapted to extend into the arcuate recesses of the one chuck jaw body end. The base portion is of greater than semi-circular shape and adapted to extend into the groove of the one chuck jaw body end. The base portion also has a generally semi-circular closed slot defined therethrough adapted to receive at least one fastener therethrough being fastenable to the one chuck jaw body for releasably clamping the base portion in the groove.

Abstract: A nipple chuck for holding a pipe nipple blank in a power driven threading machine is comprised of three arcuate sleeve segments engaged between the jaws of the threading machine chuck. The segments are internally threaded at the front ends thereof and are pivotally supported adjacent the rear ends thereof such that the internally threaded front ends are manually pivotal radially of the nipple chuck axis. In use, the segments are closed about the threaded end of the nipple blank which is then securely grasped by radial engagement of the machine chuck jaws with the segments. Following threading of the unthreaded end of the nipple blank, the nipple chuck is removed from the machine chuck jaws, and the segments are manually pivoted to an open position to release the nipple.

Abstract: The soft jaws of a lathe chuck or the like are constructed to be engaged by studs of an adjustable lock ring device for holding the jaws during the machining thereof to fit a workpiece to be held by the jaws.

Abstract: A quick clamping jaw change system comprises a blocking element on which a jaw is to be mounted. The blocking element carries a spring-biased pusher having an inclined pusher face which pushes against the jaw to displace the jaw against an inclined bearing face of the blocking member. Accordingly, the jaw slides along the bearing face to a locked position against the blocking element. The angle of inclination of the bearing face is larger than that of the pusher face so that the jaw cannot become dislodged unless the pusher is retracted against its spring bias.

Abstract: A chuck of the type having a body with a plunger that moves axially and is operably connected with wedges that move the jaws radially in response to movement of the plunger. The body is formed with guide surfaces, which maintain contact with the plunger at all times, and also with bearing surfaces which support peripheral surfaces of the wedges.

Abstract: A drilling device includes a drill chuck which is provided with at least two adjustable clamping jaws slightly rotatably guided in the drill chuck and including a guide surface for a tool shank of a tool. The guide surface is provided with at least one projection extending in direction of the chuck axis and engaging into a recess of the tool shank for rotating and axially limiting the play of the tool. The projection of each jaw is arranged circumferentially rearwardly offset to the mid-plane of each clamping jaw so that the guide surface is defined by a leading part which is wider than a trailing part in circumferential direction of the tool shank.

Abstract: In a device for the coupling of attachment chucking jaws (31) to basic jaws (11) which are movably guided in a chuck body (2) of a chuck (1), the basic jaws each have an extension (21), projecting in an axial direction, with a collar (23) projecting inwardly and/or outwardly on each extension. A recess (32) is machined into the attachment chucking jaws (31) which recess is provided with an undercut (33) and with a countersurface interacting with a stop surface of the extension (21). A locking member (41) is inserted into each basic jaw for arresting the attachment chucking jaws (31), which locking member is movable axially and introducible into the attachment chucking jaws. The actuation of the locking members is provided by an axially movable control element (42) which is automatically connected mechanically to the locking members (41) via an intermediate member (43) and/or via a deflection member (44). Due to this design the locking action is readily accomplished and monitored.

Abstract: A chuck for gripping a workpiece during a rotary operation includes a chuck body with a master jaw movably mounted on the chuck body. The master jaw includes a bayonet type locking structure. The master jaw also includes a face with at least one pin reciprocally mounted in and extending perpendicularly from the face. The pin is mechanically coupled to a piston reciprocally mounted in a piston chamber in the master jaw. The piston chamber is in communication with a source of pressurized fluid. The pin is reciprocated by selected communication of pressurized fluid to the piston chamber. A quick-change top jaw is also provided that may be quickly attached to and removed from the master jaw. The top jaw includes a bayonet type locking structure complementary to the bayonet type locking structure on the master jaw. The top jaw also includes an insert for capturing the pin in the master jaw.

Abstract: A pin assembly for removably attaching a jaw portion of a translatable jaw of a stretch jaw chuck through an elongated slotted opening in the chuck wall. A bushing is threaded into mating threads in a bore in the jaw portion. The bushing has a centrally positioned substantially rectangular shaped opening extending therethrough with a slot formed on the bottom exterior surface of the bushing adjacent to each elongated side of the rectangular opening therethrough. An attachment pin is provided with a first end configured to pass through the opening in the bushing and latch into the aligned slots on the outer surface. The pin has a coil spring confined between a pair of flat washers. The first washer adjacent the second end of the pin rides against a nut adjustable along a threaded portion of the pin.

Abstract: Top jaw assemblies combined with a chuck. Each of these top jaw assemblies comprises a body having a base projecting radially inwardly when mounted to the chuck, a cylindrical wall in the body which with the base provides a cutout portion and in which a workable rotatable workpiece gripping member or "slug" is mounted and secured to the base. The slug's periphery or annular wall conforms to and engages the cylindrical wall and includes an opening having a counterbored hole in which a screw mounts and extends below the slug to thread to a threaded aperture in the base. The slugs are machinable to provide different gripping surfaces contoured to the configuration of different workpieces, and are rotatable to provide the necessary reset position for such gripping surfaces in relation to the different sized workpieces. The base can be slightly inclined so as to force the slug's diameter against the matching radius of the cylindrical wall when the slug is torqued to the base.