Abstract: The subject invention provides a locating assembly for centering and securing a work piece. The locating assembly includes a body. The body defines an internal cavity and an opening from the cavity to the exterior of the body. A locating pin is disposed in the cavity and extends along an axis out of the opening. An actuator moves the locating pin rectilinearly along the axis. A pair of fingers are supported by the locating pin and move radially into and out of the locating pin, transversely to the axis. A central post rotates in response to the rectilinear movement of the locating pin. A dowel extends from an end of the central post into a slot in the finger. The central post moves the dowel in an arcuate path through the slot to radially move the finger simultaneous with the rectilinear movement of the locating pin.

Abstract: A clamping element is provided for clamping workpieces in a flexible position with hydraulically actuated clamping jaws, which can be moved to the workpiece and can be fixed by a clamping insert (2; 30) guided in a housing (1; 29). The clamping insert is provided with an internally located piston (3), which is guided slidingly. Clamping jaws (20; 31) as well as a clamping lever (11), which is connected to the piston via a connecting rod (8) in an articulated manner, are associated with the clamping insert. The clamping operation moves the piston upward and presses the clamping lever onto the workpiece (25). The resistance originating from the workpiece brings about the stopping of the clamping lever and at the same time continues to raise the clamping insert, as a result of which the clamping jaws come into contact with the workpiece under the workpiece and firmly connect the workpiece to the clamping insert.

Abstract: A clamping apparatus has a body and an elongated member that is extendable from the body. In another aspect of the present invention, a clamp has a workpiece engaging arm mounted adjacent an end of the elongated member. A further aspect of the present invention causes the elongated member to linearly extend and rotate when advanced.

Abstract: A method for securing a component for manufacture. The method includes fixedly coupling a first clamping member and a biasing mechanism to a tool that includes a fixture. The fixture includes a first clamping member, a second clamping member, and a biasing mechanism. The method further includes coupling the second clamping member to the fixture, using the biasing mechanism to align the component within the tool between the first and second clamping members such that the component is maintained in position relative to the fixture, securing the component between the first and second clamping members such that the first clamping member, the second clamping member, and the component are fixedly secured in position with respect to the fixture, and retaining the component in position with respect to the fixture using the first and second clamping members.

Abstract: A clamping device for clamping work pieces; the clamping device comprises a box-shaped body, a clamping member, and a manually operable control lever; first and second toggle-lever system and an intermediate guide member are provided to connect the control lever to the clamping member of the device. The first and the second toggle-lever systems are constructed and arranged to act in correlation, in such a way that in the clamping condition of the device, the pivotal axes and the intermediate hinge axis of the second toggle-lever system, in the advanced condition of the clamping member are arranged on reference lines forming a small angle against a stop.

Abstract: A clamp apparatus converts the rectilinear motion of a cylinder into the rotary motion by means of a toggle mechanism to clamp a workpiece by using an arm. A release projection is covered with a top cover made of metal, preferably with a top cover coated with a material excellent in smoothness. When the arm is going to be unlocked by using the release projection, a tongue of the top cover is lifted upwardly to open the top cover, and the release projection is pushed and moved downwardly.

Abstract: A clamping device for work pieces; the device comprises a box-shaped body, at least one clamping member protruding from the front end of the box-shaped body, and sealing means to prevent dirt from entering through the front end of the box-shaped body and a tiltable closing member, having a scraping head which extends between the rear longitudinal edge of the clamping member, and a cross edge of an aperture for protrusion of the clamping member. A spring urge the clamping member to maintain the scraping head constantly in contact with the rear edge of the clamping member during the movement.

Abstract: An apparatus for retaining objects on surfaces includes a body, a lock pin extending from the body, and a pin extending through the body and engageable with the lock pin so that movement of the pin causes movement of the lock pin so that the apparatus is secured to the surface. The pin may be slidably moved into and out of the lock pin and thereby cause the lock pin to secure and release the apparatus from the surface. The apparatus may also include an engagement member that contacts an object and provides additional retentive forces. The apparatus provides clamping forces on the object so that the object may be forged or otherwise machined. Related methods are also disclosed.

Abstract: A clamping and locating fixture includes a hollow body, a pin mountable to the body, a locking arm positionable within the body locatable between two positions and a drive pin moveable within the body to engage the locking arm. A workpiece can be directed to a clamping position by the guide pin. The pin includes an aperture allowing a locking projection of the locking arm to extend therethrough and over a workpiece to clamp the workpiece for a processing operation. The locking projection can be retracted through the aperture while the workpiece is being located or is being removed. The drive pin can be moved within the body to engage a cam follower of the locking arm. The drive pin can be supported during movement by one or more rollers mounted in the body. The drive pin can include a pin body and a pin member moveably associated with one another to selectively define the position of a cam surface.

Abstract: A power-actuated jaw is provided for a vise including first and second vise jaws. The actuated jaw includes a force transfer mechanism adapted for transferring a force from a linear actuator, such as a pneumatic piston-and-cylinder unit, through pivoting and sliding subassemblies. The sliding subassembly mounts a jaw contact member and pushes same between open/retracted and closed/extended positions. A compressed air source is connected to the piston-and-cylinder unit through a three-way valve for cycling the actuated jaw through load/unload cycles.

Abstract: A hydraulic cylinder (4) moves a rod (3) in the direction of the axial center. The interior of a casing member (2) has an annular pressure booster (7) for pressurizing the oil in an external hydraulic chamber (6). The casing member (2) has a pressurized oil feed port (27) for feeding pressurized oil to the rod-moving hydraulic cylinder (4) and the input oil chamber (16) of the pressure booster (7). A throttle valve (8) is interposed in an oil supply channel extending from the pressurized oil feed port (27) to the input oil chamber (16). An oil discharge channel, extending from the input oil chamber (16) to the pressurized oil feed port (27), is provided with a nonreturn valve capable of discharging pressurized oil from the input oil chamber (16). The nonreturn valve (9) is opened when the pressurized oil is discharged through the pressurized oil feed port (27).

Abstract: A clamping device for work pieces; the device comprises a box-shaped body having un longitudinal axis, at least one movable gripping member, and control means for moving the gripping member between an advanced and a retracted position. The gripping member is operatively connected to the control means by an articulated system having an L-shaped lever, and a toggle lever device; an arm of the L-shaped lever defines a first connecting rod pivotally supported by a first pivotal axis and connected to the clamping member by a first articulation axis. A second connecting rod is pivotally supported by the box-shaped body to rotate according to a second pivotal axis, and in turn is connected to the clamping member by a second articulation axis. The two connecting rods are of different lengths, and the pivotal axes or articulation axes, lie in a plane passing through a reference line which forms an angle with respect to the longitudinal axis of the box-shaped body.

Abstract: A clamping and locating fixture includes a hollow body, a pin or angled plate mountable to the body, a locking arm positionable within the body locatable between two positions and a drive pin moveable within the body to engage the locking arm. A workpiece can be directed to a clamping position by the guide pin or angled plate. The pin or plate includes an aperture allowing a locking projection of the locking arm to extend therethrough and over a workpiece to clamp the workpiece for a processing operation. The locking projection can be retracted through the aperture while the workpiece is being located or is being removed. The drive pin can be moved within the body to engage a cam follower of the locking arm.

Abstract: A gripper includes a body, an actuator movably supported by the body and a first hub rotatably supported by the body where the first hub rotates about a transverse axis. The gripper also includes a drive arm having a camming surface. The drive arm is coupled to the first hub so as to be rotatable about the transverse axis. A member drivingly interconnects the camming surface and the actuator such that an arm coupled to the first hub operably moves in response to the actuator.

Abstract: A clamp rod (5) is inserted into a housing (3) rotatably around an axis and movably downwards for clamping. The clamp rod (5) has an outer peripheral portion formed with three guide grooves (26) which are arranged peripherally at substantially the same spacing. An engaging ball (29) which is fitted into every guide groove (26) is supported by a lower end wall (3b) of the housing (3). Each of the guide grooves (26) comprises a rotary groove (27) and a straight groove (28) which is in upward continuity with the rotary groove (27). The rotary grooves (27) as well as the straight grooves (28) are arranged in parallel with one another. A partition wall between the adjacent guide grooves (26), (26) has a minimum thickness (T) set to a value smaller than a diameter (D) of the engaging ball (29).

Abstract: A power clamp apparatus, comprised of, a single metal body with an interior cavity running there through, a unit assembly which is inserted into said interior cavity, and said unit assembly including, a piston for slidable back and forth movement within said cavity, a lower portion of said cavity acting as a chamber for said piston, a piston rod connected to said piston, a floating head member on the piston rod, a link mechanism connected proximate to an upper end of said piston rod, a lower cap member which closes off said cavity near a bottom end of said metal body, an upper cap member which closes off the metal body proximate to a top end thereof after said unit assembly is inserted into said cavity, a drive shaft inserted through apertures in a generally transverse position through said metal body, with a central portion of said drive shaft inside the metal body being connected to an end of said link mechanism, a clamp arm attached to said drive shaft on the outside of said metal body, and wherein when sa

Abstract: A clamp with a rotatable arm for clamping a workpiece has an impact-reducing mechanism, thereby reducing an impact exerted when the arm comes into contact with the workpiece. The impact-reducing mechanism has first and second plates. A support lever is provided between the first and second plates, and sides of the support lever are engaged with plate springs of the first and second plates, respectively.

Abstract: The device includes a hollow pilot equipped with at least two retractable hooks and driven by a piston provided with a groove, the whole assembly being mounted on a supporting nosepiece. The piston is locked in clamping position by a three-point system actuated by a pneumatic cylinder. The device assembly is integrated in a housing. The device is designed to equip fixed or mobile posts for assembling vehicles, or clamping arms.

Abstract: An electrically powered clamp has a housing, a motor attached to the housing, a ball screw driven by the motor via a belt, and a linkage driven at one end by the ball screw such that the linkage rotates an output shaft attached to the other end of the linkage. The motor and belt drive the ball screw between a fully extended position to rotate the shaft to a clamped position, and a fully retracted position to rotate the shaft to an unclamped position. A built-in computer monitors and controls the clamp. The clamp can also be controlled and monitored by a remote pendant. Indicator lights on the housing and remote pendant convey clamp status information. The clamp is programmable and can memorize the clamped and unclamped positions. The clamp uses velocity and position feedback to determine appropriate drive mode. Torque monitors and timers determine if the clamp becomes stuck.

Abstract: A clamp apparatus comprises a toggle link mechanism which converts rectilinear motion of a rod member into rotary motion, an arm which is rotatable by a predetermined angle in accordance with a driving action of a cylinder section, and a lock mechanism which holds an unclamping state of the arm even when transmission of driving force of the cylinder section to the arm is cut off.

Abstract: The invention is concerned with a toggle clamp construction comprising an actuator cylinder including a linearly guided piston rod. The piston rod engages a header of the construction arranged on one end or the actuator cylinder where it is connected, via an adjusting mechanism, to a clamp arm pivotally located on the header. The header is provided with at least one engaging hole; an extension is disposed an the piston rod. For selectively fixing the opening angle which is to be taken by the clamp arm after opening the clamp mechanism, a support element for a stop is detachably inserted in the engaging hole. The said stop protrudes into the path of adjustment of the extension of the piston rod, thereby determining the opening angle.

Abstract: A workpiece holder comprises a stationary workpiece holding fixture and a workpiece rest which is releasably attachable thereon and on which can be mounted a workpiece. In all the three coordinate directions, the workpiece rest bears by counterpart surfaces on bearing surfaces formed on the workpiece holding fixture and is aligned and fixed by an oblique chucking appliance in two coordinate directions and by at least one holding-down appliance in the third coordinate direction.

Abstract: A housing (4) has a cylinder bore (10) into which an annular hydraulic piston (11) is inserted vertically movably. The piston (11) has a tubular bore (11a) into which a driven rod (6) is inserted. The driven rod (6) is provided with an input portion (6a), around which a plurality of transmission members (15) are arranged peripherally side by side. The transmission members (15) swing to a disengaging position (Y) through a push member (30) by a lowering spring (31). When clamping, the piston (11) is driven upwards. Then, first, a slant cam (27) swings the transmission members (15) to an engageable position (X), thereby enabling engaging portions (17) to face the input portion (6a). Next, the piston (11) upwardly drives the input portion (6a) through the engaging portions (17).

Abstract: A linear actuator having an adjustable piston rod for transmitting linear motion to a rotary clamp wherein the adjustable length of the piston rod corresponds to predetermined rotational angles of a clamp arm. The adjustable piston rod provides a first portion connectable to said power clamp, and a second portion connectable to a piston of the linear actuator. The first portion is fabricated from a substantially cylindrical rod having a plurality of substantially cylindrical recesses formed thereon. The second portion provides a block connected to a tubular shaft for telescopically receiving the cylindrical rod. A cam is pivotally connected to the block and provides an aperture formed therein for receiving the cylindrical rod. A torsional spring biases the cam against the cylindrical rod within the cylindrical recesses formed in the rod to prohibit the rod from telescopically moving relative to the tubular shaft.

Abstract: An apparatus to position or clamp a work piece includes a body, a generally linearly moving powered actuator positioned in the body, and a mechanism to adjust an available stroke of the actuator. The actuator has a first piston coupled to a second piston. The available stroke is defined by a distance spanned by the first and second pistons.

Abstract: A device for the floating clamping of a workpiece to be machined. The device has a pair of clamping pistons and a pair of clamping jaws which are capable of being advanced onto mutually opposite sides of the workpiece with the aid of the two clamping pistons so as to exert a clamping force acting on the workpiece. The device is configured to contain a fixedly articulated collet chuck formed by a pair of clamping levers with clamping jaws and defining a chuck opening.

Abstract: A hold down clamp that includes a base member. The hold down clamp further includes a bar pivotally connected to the base member on one end thereof. A handle is pivotally connected to a base member and on an end opposite of the bar. The clamp further includes a link connected to the handle and the bar. The link has a stopper extending from a side thereof. The clamp also includes a holder member connected to an end of the bar.

Abstract: A gripping device for use in a transfer press machine includes a jaw assembly having an upper jaw member and a lower jaw member disposed in fixed spaced-apart relationship to one another. A piston-cylinder assembly includes a cylinder element mounted on the upper jaw member and a piston element reciprocatingly housed within the cylinder element. The upper jaw member is provided with a bore passageway formed therethrough that opens into the clamping space. The piston-cylinder assembly is suitably mounted on the upper jaw member such that the piston element is displaceable therein and extensible into the clamping space defined between the jaw members. Suitably pressurizing the piston-cylinder assembly effects a displacement of the piston element into the clamping space which is sufficient to clamp a workpiece between the displaced piston element and the stationary lower jaw member.

Abstract: An electrically powered clamp has a housing, a motor attached to the housing, a ball screw driven by the motor via gears, and a linkage driven at one end by the ball screw such that the linkage rotates an output shaft attached to the other end of the linkage. The motor and gears drive the ball screw to a fully extended position to rotate the shaft to a clamped position or to a fully retracted position to rotate the shaft to an unclamped position. A built-in computer monitors and controls the clamp. The clamp can also be controlled and monitored by a remote pendant. Indicator lights on the housing and remote pendant convey clamp status information. The clamp is programmable and can memorize the clamped and unclamped positions. The clamp uses velocity and position feedback to determine appropriate drive mode. Torque monitors and timers determine if the clamp becomes stuck.

Abstract: A mounting bracket for a fluid actuated parts gripper having a body, a body member portion and a plurality of longitudinally extending fasteners is provided. The body member portion is removably attached to the body. A first through-opening is configured to receive the fluid actuated parts gripper and a second through-opening is configured to receive a support. The body has a variable slot configured to reduce and increase the diameter of the second through-opening to lock and unlock the support. The plurality of longitudinally extending fasteners removably attach the body member portion to the body.

Abstract: A rotary clamp having an adjustable pre-stop wherein the rotary clamp includes a linear actuator for transmitting linear motion to a linkage assembly. The linkage assembly converts the linear motion into rotary motion of a clamp arm, wherein the clamp arm moves between a clamped position and an unclamped position. The adjustable pre-stop provides a substantially cylindrical member having a substantially polygonal shaped surface formed on the cylindrical member. The polygonal surface matingly engages a substantially polygonal shaped aperture formed in the housing of the rotary clamp. An eccentric mid-portion of the cylindrical member engages the linkage assembly in the clamped position to prohibit the clamp arm from rotating beyond the clamped position.

Abstract: A clamping element is provided for clamping work pieces on machine tables and the like with a tilt ably mounted clamping lever, which is longitudinally displaceable in the clamping plane. The clamping element includes a housing (1) provided with a fork head (3), in the forks of which holes (4) are provided centrally and into which a king pin (5) each is inserted in a rotatably mounted manner. The king pins (5) are provided with guide pins (6), which have two opposite flattened areas. The clamping lever is a square with two grooves (8) milled in, in opposite locations. The clamping lever (2) can be pushed with its grooves (8) onto the guide pins (6) of the king pins (5) inserted into the fork head (3).

Abstract: A workpiece securing apparatus or clamp includes a piston, a coupling or transmission mechanism, and an unlock device. In another aspect of the present invention, the unlock device is rotatable to move the coupling mechanism. Still another aspect of the present invention provides a mechanism which converts linear movement of a piston to rotary motion of a hub and workpiece interfacing arm.

Abstract: A rotary clamp having a linkage assembly that provides an over-center condition for providing high actuation and clamping forces without excessively wearing the components of the linkage assembly. The linkage assembly is connected to a linear actuator for converting linear actuator motion into rotary clamp motion between a clamped position and an unclamped position. The linkage assembly provides a first link having an aperture for receiving a pin and a roller wherein the roller is coaxially connected o the pin. The second link is pivotally connected to the first link, and the third link is pivotally connected to the second link. The roller of the first link rollably engages a surface on the third link when moving in and out of the clamped position. A beam-like structure connected to the housing provides a wear surface wherein the pin engages the wear surface in response to the roller engaging the third link to prohibit the first link from reaching an over-center position.

Abstract: A clamp apparatus comprises a toggle link mechanism including a link plate connected to a rod member and a support lever linked to the link plate, for converting rectilinear motion of the rod member into rotary motion, a long hole formed for the link plate, for being engaged with a knuckle pin provided on a first end side of the rod member, and a lever stopper formed with a fastening surface for regulating a rotary action of the support lever.

Abstract: A clamping element for clamping workpieces in a flexible position. Two slides (2 and 3) guided in parallel slide in cutouts (4 and 5), which are provided in a housing (1). The force for moving the slides is introduced via plunger pistons (9 and 10) by these pistons acting on the front sides (17 and 18) of the slides, whereby a short lever arm is formed between the introduction of the force and the action of the force. A piston (22), which is provided at its head with a wedge (23), is introduced into the housing (1) at right angles to the plane of movement of the slides. This wedge is guided in recesses (6), which are associated with the slides. Due to the piston (22) being pulled down, its wedge is jammed in the recesses (6) of the slides (2 and 3) and the wedge pushes the slides into the cutouts (4 and 5) and fixes same in a self-locking manner.

Abstract: A clamping element is provided for clamping workpieces in a flexible position with hydraulically actuated clamping jaws, which can be moved to the workpiece and can be fixed by a clamping insert (2; 30) guided in a housing (1; 29). The clamping insert is provided with an internally located piston (3), which is guided slidingly. Clamping jaws (20; 31) as well as a clamping lever (11), which is connected to the piston via a connecting rod (8) in an articulated manner, are associated with the clamping insert. The clamping operation moves the piston upward and presses the clamping lever onto the workpiece (25). The resistance originating from the workpiece brings about the stopping of the clamping lever and at the same time continues to raise the clamping insert, as a result of which the clamping jaws come into contact with the workpiece under the workpiece and firmly connect the workpiece to the clamping insert.

Abstract: A clamping frame for a plastic sheet thermoforming apparatus and which is designed for gripping and retaining the peripheral edge of the plastic sheet. The frame includes a pair of pivotally interconnected jaws which are pivoted between open and closed positions by an air cylinder actuator. The actuator is mounted to one of the jaws, and the operative pressurized air is fed to and removed from the actuator via fluid delivery lines which are located within the interior of the jaw to which the actuator is mounted. External air hoses are thereby avoided, and the air streams which flow through the jaw have a cooling effect.

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 rotary clamp having a linkage assembly that provides an over-center condition for providing high actuation and clamping forces without excessively wearing the components of the linkage assembly. The linkage assembly is connected to a linear actuator for converting linear actuator motion into rotary clamp motion between a clamped position and an unclamped position. The linkage assembly provides a first link having an aperture for receiving a pin and a roller wherein the roller is coaxially connected o the pin. The second link is pivotally connected to the first link, and the third link is pivotally connected to the second link. The roller of the first link rollably engages a surface on the third link when moving in and out of the clamped position. A beam-like structure connected to the housing provides a wear surface wherein the pin engages the wear surface in response to the roller engaging the third link to prohibit the first link from reaching an over-center position.

Abstract: A workpiece securing apparatus or clamp includes a piston, a coupling or transmission mechanism, and an unlock device. In another aspect of the present invention, the unlock device is rotatable to move the coupling mechanism. Still another aspect of the present invention provides a mechanism which converts linear movement of a piston to rotary motion of a hub and workpiece interfacing arm.

Abstract: In a die clamping apparatus for an injection molding machine or the like, die clamping means for coupling and pressing a moving die plate 9 to a fixed die plate via a tie bar 15 has a die clamping cylinder consisting of two stages of a large-diameter cylinder 11 and a small-diameter cylinder 31 and a ram formed into two stages of a large-diameter ram 13 and a small-diameter ram 25. The large-diameter ram 13 is inserted in the large-diameter cylinder 11, and the small-diameter ram 25 is inserted in the small-diameter cylinder 31. The proximal end portion of the tie bar 15 is connected directly to the small-diameter ram 25. Large oil chambers 11c and 11d are provided on both sides of the large-diameter ram 13, and a small oil chamber 11e is provided on the tie bar connection side of the small-diameter ram 25. An oil pressure is supplied appropriately to each of the large oil chambers and the small oil chamber in the die clamping cylinder to appropriately move the tie bar 15.

Abstract: A apparatus includes an arm, a housing having a chamber, a vane rotatably movable within the chamber and an engaging member. The engaging member is slidingly coupled to the arm. The engaging member is selectively positionable in an engaged and a disengaged position with the vane such that the arm rotates in response to rotation of the vane when the engaging member is in the engaged position.

Abstract: A workpiece holder comprises a stationary workpiece holding fixture and a workpiece rest which is releasably attachable thereon and on which can be mounted a workpiece. In all the three coordinate directions, the workpiece rest bears by counterpart surfaces on bearing surfaces formed on the workpiece holding fixture and is aligned and fixed by an oblique chucking appliance in two coordinate directions and by at least one holding-down appliance in the third coordinate direction.

Abstract: An apparatus to position or clamp a work piece includes a body, a generally linearly moving powered actuator positioned in the body, and a mechanism to adjust an available stroke of the actuator. The actuator has a first piston coupled to a second piston. The available stroke is defined by a distance spanned by the first and second pistons.

Abstract: A chemical mechanical polishing method comprises preparing a workpiece to be treated and chemically and mechanically polishing the workpiece to be treated by pressing the workpiece to be treated against a rotating disk carrying a piece of abrasive cloth bonded to the surface thereof at a first position on the disk, while dropping abrasive solution on the abrasive cloth, and, in parallel with the polishing, dressing the abrasive cloth by pressing a dresser carrying diamond grains sticked thereto against the abrasive cloth at a second position on the disk.

Abstract: A gear mechanism has a first gear which is coaxially connected to a drive shaft of a rotary driving source, a second gear which is meshed with the first gear, and a third gear which is meshed with the second gear and which is integrally interlocked with a ball screw nut. Diameters of the first to third gears are set to be smaller than a dimension of an upper body in a widthwise direction and a dimension of a lower body in the widthwise direction.

Abstract: A toggle lever clamping device for clamping a workpiece to a support frame; the clamping device comprises a box-shaped head to which a clamping arm is pivoted to rotate between an open and a closed condition to release respectively to lock the workpiece; the clamping arm is operatively connected to an actuator by a toggle lever mechanism having a dead center condition beyond which the clamping arm is tightened against the workpiece. The toggle mechanism comprises an elastically yieldable connection link which, upon reaching the dead center of the toggle lever mechanism is sequentially allowed to axially yield for a some degree and to deflect in a controlled mode by confronting stop means provided on the same clamping arm.

Abstract: A device in the form of a self-centering steady rest for clamping or holding workpieces on a machine tool is provided. Three holding members are supported in a separate, intermediate member that is disposed in a housing and is displaceable therein, toward and away from a workpiece, by means of a piston. Formed in the walls of the housing are control cams by means of which the outer holding members are pivotably guided via adjustment movements of the intermediate member.

Abstract: A clamp jig has a positioning pin provided at the tip of a cylindrical member, and a clamp arm is mounted in a slit formed in this positioning pin, so as to be able to swing and so as to be able to axially advance and retreat. A reciprocating shaft is connected to the clamp arm by a connecting pin, and a spring force is applied to this reciprocating shaft in a retreating direction by a compression coil spring. A plunger 35 brought into contact with the reciprocating shaft is mounted in a drive housing so as to be able to axially reciprocate, and a female screw member driven by a motor is thread-connected to a male screw member secured to this plunger. Accordingly, it is made possible to reliably perform positioning and clamping, of a member to be fixed, and unclamping thereof by a low-cost motor.