Abstract: Semiconductor technology requires the use of object holders, which are capable of holding wafers securely, also during rotation. In order to save time and expense, such holders should be suitable for integration directly into a processing facility, wherever possible. According to the invention it is proposed to provide centrally mounted holders which comprise support surfaces for the wafer and pivotable gripper fingers, in which the gripper fingers are pretensioned by means of at least one pretension element in the holding position and are actuated through one opening mechanism, in which at least one opening mechanism and at least one pretension element are integrated in the central clamping arm fixture and/or in the clamping arms.

Abstract: The invention is based on a tool holder for a power tool (i0), in particular for a hand-guided power angle grinder, having a slaving device (12) by way of which an inserted tool (14), which has a disklike hub (64), can be operatively connected to a drive shaft (16), and having a fastening device (18) which has a holding position and a release position. It is proposed that with the fastening device (18), the inserted tool (14) can be connected by positive engagement to the slaving device (12) in the circumferential direction (20, 22) in the release position and additionally in the axial direction (24, 26) in the holding position.

Abstract: A chuck for mounting wheel castings having different diameters upon a wheel lathe for machining the casting to final shape is provided. The chuck includes stepped jaw inserts that cooperate with corresponding stepped part supports to securely mount the wheel castings upon the chuck.

Abstract: A tool clamping device for a tool having a shaft which is accurate to size and which can be inserted into the receiving bore of a tool support, is provided with a clamping device which can be screwed on a screw thread of the tool support while the tool has a ring, which is arranged radially protruding in a clamping area. The ring extends in the circumferential direction and, with the shaft of the tool inserted into the receiving bore, the clamping device is axially supported against the ring (FIG. 2).

Abstract: A quick-action locking device for an electric power tool including a locking spindle (4) axially displaceable in the hollow spindle (2) of the electrical power tool between a working tool locking position and a working tool exchange position, and a locking lever (6) provided at the end of the locking spindle remote from the working tool and having a slider cooperating with the locking spindle (4) for displacing the same, upon a pivotal movement of the locking lever (6), to its tool exchange position, with the slider (8) having a contact region engageable with a contact surface provided at the end of the locking spindle (4) remote from the working tool (3), and with the contact surface of the locking spindle (4) having an extent, in a pivotal direction of the locking lever (6), corresponding to at least the radial distance (a) of the contact region from the pivot axis (9) of the lever multiplied, in the locking position of the locking lever (6), by a sin (?) of an angle formed by a line, which defines the radi

Abstract: The present invention relates to a chuck for gripping workpieces having an outer chuck body rotatable about a chuck axis and defining a cavity. The chuck includes a collar, coupled to the outer chuck body, having a slot with a slot axis angled relative to said chuck axis. An inner chuck body located within the cavity is movable along the chuck axis relative to the collar and the outer chuck body. The inner chuck body includes a bore having a bore axis angled relative to said chuck axis into which the jaw rod is disposed, with the jaw rod being coupled to the collar.

Abstract: A computer controlled positioning table for use in automatically rotating a large diameter article into which an evenly spaced circle of bolt holes are to be drilled. The article to be drilled is centered and clamped onto a table top of the table and then the computer rotates the table top incrementally to precisely position the article relative to an associated stationary drill stand that is used to drill the desired holes in the article. Rotation of the table top is computer controlled, allowing the operator to select the number of bolt holes for each article. Once the table top has rotated to the proper position, locking mechanisms and support roller provided under the table top hold the table top stationary in the proper position while a hole is drilled in the article.

Abstract: A drawn down chuck for gripping the inner or outer diameter of a workpiece. The chuck includes rotatable jaws disposed in a chuck body. The rotatable jaws helically and then linearly retract into the chuck body to secure workpieces having a shaft and an enlarged offset such as a hub or flange proximate to the end of the shaft. Cam assemblies interact with the jaw rods to provide the helical and linear movement. The cam assemblies include a cam groove and a cam follower, wherein the cam groove has a linear and a helical segment. The cam follower is operatively engaged on the cam groove as the jaw rod moves between the extended and retracted position so that when the jaw rod is retracted it first moves helically and then axially.

Abstract: A quick-action clamping device for a power tool includes a clamping spindle (4) arranged in the hollow spindle (2) of the power tool, an elastic member (5) for biasing the clamping spindle (4) into its clamping poition, in which the working tool is claming between a claming flange (7) provided on a working tool-side end of the claming spindle (4) and the hollow spindle (2), an actuation element (24) for displacing the claming spindle (4) against the biasing force of the elastic member and into its exchange position in which the working tool (3) is released, and a compansator (15) for interrupting action of the elastic member (5) on the clamping spindle (4) in the exchange position of the clamping spindle (4).

Abstract: A chuck for an annular core bit (1) having an inner thread (2) includes a motor-driven rotatable spindle (4) having a threaded support (5) cooperating with the inner thread (2) for supporting the annular core bit (1), a stop member (7) associated with the axial stop flange (6) provided on the work spindle (4), locking wedge elements (9) for axially connecting the stop member (7) with the axial stop flange (6) under compressive strain, and a manually actuatable, displaceable release member (10) for displacing the locking wedge elements (9) between a position in which the locking wedge means (9) axially connects the stop member (7) and the axial stop flange (6) under compressive strain, and a position in which the stop member (7) is axially displaceable relative to the axial stop flange (6).

Abstract: A chuck has a chuck body rotatable about a main axis and a plate displaceable axially on the body between an outer position and an inner position. Springs urge the plate into the outer position. A locking element on the body can move between a blocking position preventing displacement of the plate from the outer position into the inner position and a freeing position permitting such displacement. A plurality of jaw holders angularly spaced about the axis are fixed axially on the plate and each have radially displaceable outer and inner ends. A piston axially displaceable in the body has cam formations engaging the jaw-holder inner ends for radially displacing the jaw-holder outer ends on axial displacement of the piston.

Abstract: A coupling device for engaging an exchangeable tool support (7) for corotation with a shaft (2) of a motor (1), with the shaft (2) mounting at is driven end a hollow shaft projection (3) for receiving the tool support (7). Alternatively, the tool support (7) can mount the hollow shaft projection for receiving the driven end of the shaft. The shaft (2) and/or the tool support mounts a locking device for securing the tool support (7), and which is actuated by centrifugal force. The coupling device is designed and constructed so as to permit a simple mounting of even heavy tools to the output shaft of the motor, and a reliable connection of the tool and drive.

Abstract: A drawn down chuck for gripping the inner or outer diameter of a workpiece. The chuck includes rotatable jaws disposed in a chuck body. The rotatable jaws helically and then linearly retract into the chuck body to secure workpieces having a shaft and an enlarged offset such as a hub or flange proximate to the end of the shaft. Cam assemblies interact with the jaw rods to provide the helical and linear movement. The cam assemblies include a cam groove and a cam follower, wherein the cam groove has a linear and a helical segment. The cam follower is operatively engaged on the cam groove as the jaw rod moves between the extended and retracted position so that when the jaw rod is retracted it first moves helically and then axially.

Abstract: A part clamping fixture assembly for locating and holding a wheel hub assembly for final finishing a flange face of the wheel hub includes a top portion having a bore formed therethrough. The fixture assembly includes a puller member having an upper end for communicating with a drive mechanism and a lower end opposite the upper end. The puller member has an encasing disposed therearound. The encasing has a lower portion for engaging a bearing of the wheel hub assembly and an upper portion in communication with the top portion. The fixture assembly also includes a lift mechanism for lifting the wheel hub assembly generally upward such that a surface of the bearing engages the lower end of the puller member. The lift mechanism is engageable with the lower end of the puller member such that the drive mechanism will rotate the puller member and the lift mechanism together to accomplish the final finishing of the flange face.

Abstract: A housing and hub for an apparatus for securing a workpiece to a rotatable machine member are provided. The machine may include a lathe. The workpiece includes a rotor such a brake rotor. The apparatus includes a hub slidably engageable with a rotatable driven shaft of the lathe. The hub is formed with a first banded channel. Also included is a centering device axially positionable on the shaft. A spring having a distal end demountably insertable in the hub, and a proximal end connectable to the centering device, is included. The apparatus also includes a retaining ring attachable to the hub for retaining the centering device in the hub. A housing is provided that is freely movable axially on the shaft for securing the rotor substantially vertically on the shaft. The housing is formed with a second banded channel. A locking nut is included to secure the components of the apparatus on a machine member.

Abstract: In a finishing apparatus, a plurality of works are retained at distances from each other in a direction of an X-axis. A single spindle is disposed on a table movable in the direction of the X-axis, the spindle has an axis parallel to an axis of each of bores to be finished, and is capable of being advanced and retracted axially. A measuring device is provided that measures an inside diameter of each finished bore and which is advanced and retracted independently from the spindle in a direction along the axis of each finished bore. A combination tool is mounted at a tip end of the spindle and finishes an inner surface of any of the bores to be finished, even if the position of insertion of the combination tool into each of the bores is changed.

Abstract: A clamping module has a retractable drawbar and pivoting expansion members. The expansion members are pivotable from a first position having an effective diameter which is less than the minimum diameter of the workpiece hole through which the drawbar and expansion members are extended and a second position engaging the workpiece so as to transmit an axial force from the drawbar through the expansion members to the workpiece sufficient to secure the workpiece.

Abstract: A clamping module has a retractable drawbar and pivoting expansion members. The expansion members are pivotable from a first position having an effective diameter which is less than the minimum diameter of the workpiece hole through which the drawbar and expansion members are extended and a second position engaging the workpiece so as to transmit an axial force from the drawbar through the expansion members to the workpiece sufficient to secure the workpiece.

Abstract: A fixture for receiving and retaining a fitting having a through bore and an end wall. The fixture comprises a body for receiving the fitting, and an actuator for engaging the fitting at the intersection of the through bore and the end wall such that the fitting is held securely between the body and the actuator.

Abstract: A retractable chuck has a housing adapted to be fastened to a spindle of a lathe, a plurality of shafts mounted in the housing and having proximate ends near the lathe adapted to be coupled to a drawbar of the lathe, and jaws each fastened to one of the shafts. The shafts are formed with a guide groove and guide pins fixed to the housing are received in one of the guide grooves. Each of the grooves has a first portion extending parallel to the central axis of the respective shaft, and a second portion extending obliquely with respect to the central axis of the shaft from one end of the first portion near the lathe toward the proximate end of the chuck. This makes it possible to clamp a stepped workpiece.

Abstract: A clamping device for objects such as workpieces to be treated and the like has a base body having at least one abutment surface for at least one object to be clamped, at least one clamping finger located on a movable carrier and having at least one clamping surface for at least one object to be clamped, so that a clamping force for clamping the at least one object is applied between the abutment surface and the clamping surface, an actuating element in operative connection with the at least one carrier for applying a clamping force in a clamping direction and opposite to it so that the carrier with the clamping finger being movable in a direction substantiallytransverse to the clamping direction relative to the actuating element, and a bearing block in which the carrier with the clamping finger is held movably relative to the bearing block, the bearing block being displaceble in the base body substantially transversely to the clamping direction.

Abstract: A housing and hub for an apparatus for securing a workpiece to a rotatable machine member are provided. The machine may include a lathe. The workpiece includes a rotor such a brake rotor. The apparatus includes a hub slidably engageable with a rotatable driven shaft of the lathe. The hub is formed with a first banded channel. Also included is a centering device axially positionable on the shaft. A spring having a distal end demountably insertable in the hub, and a proximal end connectable to the centering device, is included. The apparatus also includes a retaining ring attachable to the hub for retaining the centering device in the hub. A housing is provided that is freely movable axially on the shaft for securing the rotor substantially vertically on the shaft. The housing is formed with a second banded channel. A locking nut is included to secure the components of the apparatus on a machine member.

Abstract: An apparatus for securing a workpiece to a rotatable machine member. The machine may include a lathe. The workpiece includes a rotor such a brake rotor. The apparatus for securing a workpiece to a machine member includes a hub slidably engageable with a rotatable driven shaft of the lathe. Also included is a centering device axially positionable on the shaft. A spring having a distal end demountably insertable in the hub, and a proximal end connectable to the centering device, is included. The apparatus also includes a retaining ring attachable to the hub for retaining the centering device in the hub. A housing is provided that is freely movable axially on the shaft for securing the rotor substantially vertically on the shaft. A locking nut is included to secure the components of the apparatus on a machine member.

Abstract: A device for centering and gripping, particularly for automotive bodywork parts, comprises a body (1) with an actuating means (2) and has centering means (13) and gripping means (11, 12). The centering means (13) and the gripping means (12) comprise in combination a centering member (13) containing at least one retractable gripping member (11 or 12).

Abstract: A tool for centering and clamping of at least a part (P) to be fixed in position and comprising a through passage and adjusted for the tool, comprises a pilot device borne at the end of a case having an upper face forming a support for the part and clamping members. The tool further comprises elements for driving the clamping members between a centering position in which the clamping members are retracted into the pilot device and a plurality of clamping positions in which the clamping members project outside the pilot device and rest on the part (P). The driving elements are arranged for simultaneously pivoting and translating the clamping members between the centering position and the clamping position. The invention is useful for handling parts to be fixed in position.

Abstract: A wheel component has an annular extension formed upon an end. The extension is clamped to a wheel lathe and allows turning a tire bead seat upon the wheel component adjacent to the extension.

Abstract: A lathe chuck assembly is configured for high-speed turning operations. The assembly includes a riser adapter and a yolk plate movably connected with respect to the riser adapter. First, second and third cam arms are connected to the yolk plate for grasping a workpiece for turning operations. Each cam arm includes a cam slot formed therein. A face plate is mounted to the riser adapter. The face plate includes first, second and third cam arm openings formed therein for receiving cam pins for cooperation within the respective cam slots. The face plate includes a locally thickened cross-sectional area surrounding each cam arm opening for added structural integrity and a plurality of locally thinned cross-sectional areas spaced across the face plate for weight reduction. A web structure of substantially uninterrupted cross-sectional thickness is provided for structural integrity at high rotational speeds.

Abstract: Even though the shape and size of an aluminum wheel to be chucked for machining is changed, it is possible to easily deal with this situation and to simply chuck the same. In a finger chuck which finger levers 5 are swingably mounted in the radius direction via fulcrum point parts 8 installed at adequately spaced positions in the circumferential direction of the outer circumference of a chuck body, the front end face part of the chuck body front part, which constitutes the front portion of said fulcrum point parts, is eliminated, a plurality of front end face parts 12 which are intended to be selectively replaced and mounted at said eliminated portion are formed integral with each other, and at this time said plurality of front end face parts are provided with a clamp seat 14 and a centering member 23 so that each of said front end face parts can be applied to specified kinds of different workpieces w.

Abstract: A chuck apparatus is operative to center and lock an aluminum wheel in a lathe having a machining centerline. The chuck includes a face plate adapted for rotation about the centerline, and first, second and third radial slide blocks slidably movable perpendicularly with respect to the centerline and adapted to receive locators. First, second and third clamps are equally spaced about the periphery of the face plate and are adapted for applying a clamping force to the aluminum wheel in a direction parallel to the centerline. The slide blocks are actuated independently of the clamps to facilitate centering of the wheel prior to clamping. The slide blocks are selectively movable in a first direction radially outward from the centerline for causing the locators to engage the wheel and a second direction radially inward to cause the locators to engage the wheel.

Abstract: Workholding apparatus for mounting a workpiece (6) on a machine tool, the apparatus comprising a diaphragm chuck portion (2) and a tailstock portion (4). The chuck (2) includes a backing ring (70) with face portion (74) attached to the diaphragm (44) with the backing ring (70) having a centering locator guide (76) for centering and stopping the axial advancement of a workpiece in the chuck (2). The chuck (2) also includes a support ring (106) including material (109) located at the periphery thereof for sealing the area between the chuck and the workpiece and dampening vibrations brought about by the machining process. The tailstock portion (4) comprises a rotatable tailstock support (112) having at least one workpiece seating surface (117). The tailstock includes a centering locator guide (114) extending axially from the tailstock support (112) and having a generally curved outer surface (115) for centering the workpiece in the chuck (2).

Abstract: A fixture for mounting a vehicle wheel upon a lathe. The fixture includes a support structure which carries a plurality of movable arms. The arms extend axially within the wheel rim and through the wheel pilot hole. The arms have jaws formed on their ends. The arms are movable to cause the jaws to clamp the wheel hub against the support structure. Because the arms clamp the wheel hub, the entire outside surface of the wheel rim is exposed for machining, allowing machining of both tire bead seats during the same machining operation.

Abstract: A clamp for a memory disk having a disk aperture bounded by a cylindrical peripheral edge and chamfered peripheral edges includes facing clamp members having chamfered peripheral edges which are parallel to the chamfered edges of the disk aperture. The clamp directs forces to the disk chamfered edges substantially perpendicular to the disk sides thus preventing deformation or cracking of a clamped disk. Preferably, the disk is held between a chamfer on a housing and a chamfer on an expandable collet extending from the housing. A longitudinal movable expander extending through the housing and collet is attached to a pull bar to expand curved segments of the collet to first move the segments particularly the chamfer to a radial position opposite but spaced from a disk chamfered edge, then longitudinally to contact and clamp the disk with a predetermined force.

Abstract: A finger chuck for use with a machine tool comprises a chuck main body having a front wall and a rear wall, the front wall and the rear wall defining a space therebetween. A centering device is supported by the front wall for centering the workpiece on the axis of the chuck main body. Jaws are supported by the front wall for holding the workpiece. A rearwardly protruding portion is provided on the front wall toward the rear wall within the space, and a cavity is defined in the protruding portion so as to open in the front surface of the front wall, the cavity accommodating at least part of the centering device. A drawing member extends through the rear wall in the axial direction, and is shifted by a drive source in the axial direction. A guide portion is disposed in the space integrally with the drawing member, so as to be guided on the protruding portion in the axial direction. A seat surface is formed around the guide portion, and a spider is supported on the seat surface for movement therealong.

Abstract: A clamping device for clamping a workpiece having a center hole, comprises a base member against which the workpiece can be seated, such that the center hole of the workpiece is aligned with a center aperture in the base member. The base member carries outer clamps for clamping an outer portion of the workpiece against the supporting surface. A push member projects through the hole and aperture and carries inner clamps for clamping an inner portion of the workpiece. An actuator displaces the push member for moving the inner clamps to their clamping position, whereupon the push member pushes the outer clamps to their clamping positions. A spring -biased ejector pushes the inner and outer clamps to their non-clamping positions, and ejects the workpiece when the actuator is moved to a release position.