Abstract: An actuated workpiece clamp is provided. The clamp of this disclosure illustratively has an actuator, a linkage, a cam member, a cam pin, and at least one jaw member.

Abstract: A clamp device including a support frame member, a lower clamp unit and an upper clamp unit supported by the support frame member. The lower clamp unit has a pair of lower jaws and a first actuator for actuating at least one of the lower jaws between clamped and unclamped positions. The upper clamp unit has a first upper jaw and a second upper jaw, and a second actuator for actuating one or more of the upper jaws between clamped and unclamped positions, the first upper jaw being fixed for movement with one of the lower jaws.

Abstract: A locating pin is mounted on a hollow post member in such a manner that a slit of the locating pin is communicated with an interior of the post member. A clamp arm is axially movably received in the slit and has a hook-shaped head exposed to an upper portion of the slit and a base portion exposed to the interior of the post member. The clamp arm is axially movable between a clamp position wherein the hook-shaped head is projected outward from the upper portion of the slit and an unclamp position wherein the hook-shaped head is retracted in the upper portion of the slit. A guard structure is installed in the slit of the locating pin to isolate the interior of the post member from the interior of the slit while permitting the axial movement of the clamp arm in the slit.

Abstract: A workpiece cradle and a clamp arm is provided, and an arm opening/closing cylinder 15 for opening and closing the clamp arm and the workpiece cradle are attached to a moving block 13. To a workpiece-cradle driving cylinder 23 provided with a piston rod 25 for driving the moving block 13, fluid is supplied from workpiece-cradle driving supply/discharge ports 27a and 27b formed in a manifold block 21. To the moving block 13, guide rods 33a and 33b are fixed and, to the arm opening/closing cylinder 15, fluid is supplied, from arm driving supply/discharge ports 34a and 34b formed in the manifold block 21, via hollow holes 36a and 36b in the guide rods 33a and 33b and via fluid supply/discharge paths 43a and 43b in the moving block 13.

Abstract: A motor pack for an electrically driven tool includes at least one electric motor and a linearly displaceable member coupled to the electric motor such that the linearly displaceable member is displaced axially by operation of the at least one electric motor. The motor pack further includes a housing enclosing the electric motor and at least partially enclosing the linearly displaceable member. The housing includes a front plate to which a tool head may be removably coupled. The front plate has an aperture formed therein through which the linearly displaceable element can be coupled to a moveable element in the tool head. The motor pack also includes tool control circuitry enclosed within the housing and electrically coupled to the electric motor to control operation thereof.

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 toggle-lever clamping device for clamping work pieces includes a box-shaped body which supports a clamping member movable between a forward disengaging position and a backward position for clamping the work piece. The device also includes control elements operatively connected to the clamping member by elements of an intermediate toggle-lever connecting link, and an articulated quadrilateral system; the intermediate connecting link is in the form of an axially yieldable flat spring having a plurality of side by side arranged elastically yieldable spring sections, aligned according to its longitudinal axis. The articulated quadrilateral system and the intermediate connecting link are constructed and disposed in such a way as to maintain an irreversible locking condition of the clamping member to clamp work pieces, compensating differences in thickness of the work pieces.

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 fluid actuated parts gripper assembly is provided. The fluid actuated parts gripper assembly has a pair of opposable pivoting jaw members, a fluid driven actuator, a linkage structure, a sensor target, a mounting and a sensor. The linkage structure is driven by the fluid driven actuator and is coupled to at least one of the pair of opposable jaw members. The sensor target is coupled to the linkage structure and is movable therewith. The mounting is located adjacent the sensor target and the sensor is mounted on the mounting configured to detect the sensor target.

Abstract: A sensor for measuring a clamp arm position in a power clamp provides a sensor wheel that may fit beneath the clamp arm. A low profile sensor body abuts an edge of the sensory wheel to detect the sensor position without undue change in the power clamp or clearance about the power clamp.

Abstract: The present invention is directed to a cushioning apparatus for a pneumatic device. The cushioning apparatus generally comprises a body, wherein a piston and cylinder reside therein, wherein the piston is operable to translate along a first axis. A first port associated with a first end of the cylinder is in fluid communication with an interior portion of the cylinder through a first cushioning hole, and a second port associated with a second end of the cylinder is in fluid communication with the interior portion through a second cushioning hole.

Abstract: A swing-arm clamp is provided. The swing-arm clamp has a locating member that is movable in concert with a rod which is disposed in the clamp. The locating member engages a guide when the arm is located in a first position and separates from the guide when in a second position.

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 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 sealed pin locating and clamping apparatus includes a body, an actuator moveably supported by the body, a pin mounted to the body and a clamping member drivingly coupled to the actuator. The actuator includes a first rod having an internal cavity and a second rod rotatably positioned within the internal cavity. A portion of the pin is positioned within a cam slot formed in the second rod and the second rod rotates in response to linear movement of the first rod to position the clamping member.

Abstract: A housing (3) has an upper end wall (3a) which supports an upper slide portion (11) of a clamp rod (5) vertically movably. The housing (3) has a lower end wall (3b), a support cylinder (13) of which supports a lower slide portion (12) of the rod (5) vertically movably. The rod (5) is provided with an input portion (14) between the upper slide portion (11) and the lower slide portion (12). A clamp spring (20) connected to the input portion (14) drives the rod (5) downwards for clamping. The lower slide portion (12) has an outer periphery provided with a helical rotary groove (27) and a straight groove (28) which is in upward continuity with the rotary groove (27). A ball (29) engages with the rotary groove (27) and the straight groove (28). The ball (29) is supported by an inner wall (13a) of the support cylinder (13).

Abstract: The present invention is directed to a locating and clamping fixture for locating and clamping a workpiece, wherein the fixture comprises a generally hollow body and a floating clamping arm. A first cam follower is located within the body, and a drive pin comprising a second cam follower and having a first axis associated therewith is moveable within the body along the first axis. The floating clamping arm comprises a first cam surface, a second cam surface, and a gripping portion, wherein the first cam surface and the second cam surface are operable to respectively engage the first cam follower and the second cam follower. Upon an application of a driving force by the drive pin, the clamping arm is operable to rotate and linearly translate with respect to the body via a translational movement of the drive pin along the first axis, wherein the gripping portion of the clamping arm is operable to extend over the workpiece and to clamp the workpiece to the body.

Abstract: An improved shiftable clamp (12) adapted for connection to a fixture (10) is provided, wherein the clamp (12) is selectively operable to engage and hold a workpiece (14) to the fixture (10). The clamp (12) includes a tubular body (22) and a piston (24) telescopically received within the body (22). Movement of the piston (24) is guided and controlled by way of a cam assembly (26) including a cam track (64) formed in the piston (24) and an associated cam track follower ball (66) mounted on the body (22). A spring unit (74) is also provided on the body (22) and includes a spring (82, 96) serving to self-center and bias the ball (66) into the track (64). This insures that the ball (66) smoothly rotates during movement of piston (22) and reduces wear and premature clamp failure.

Abstract: The abutment of the rod to the work piece is accomplished in a stable manner by providing an air passage in the inside of the work support for supplying pressurized air for detecting the abutment between the rod and the work piece. Work support is equipped with case, rod, sleeve that elastically deforms to reduce its diameter, hydraulic cylinder for driving rod in an advancing direction, spring for elastically energizing rod in advancing direction, detection nozzle for ejecting pressurized air, air passage connected to detection nozzle, sensor for detecting abutment between the tip of rod and work piece based on air pressure, and a control unit. Work piece is supported by the tip of rod abutting work piece while ejecting pressurized air from detection nozzle, and locks rod by elastically deforming sleeve to reduce its diameter after detecting the abutment of rod by a pressure sensor and control unit.

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: An apparatus for absorbing the mounting and clamping forces of a linkage assembly of a power clamp. An enclosed bilateral housing of a power clamp is provided, wherein a linear actuator is connected to the housing and provides a piston rod extending into the housing. A linkage assembly is connected to the piston rod and disposed within the housing for converting the linear motion of the piston rod into rotary motion of a clamp arm. A high strength plate and beam structure is disposed within the housing and connected to the linkage assembly for absorbing the mounting and clamping forces generated by the linkage assembly. By absorbing the mounting and clamping forces of the linkage assembly, the high strength plate and beam structure allows the housing to be fabricated from a lightweight, inexpensive material.

Abstract: A powered clamp includes a pair of moveable members which engage one another to maintain, at least temporarily, a locking position of an arm when actuating fluid pressures have been decreased or lost. In another aspect of the present invention, the apparatus is simplified by engaging a slide rod with a rotatable hub. Furthermore, the overall packaging envelope required by the clamp is reduced by aligning the transverse axis of the rotatable hub with a longitudinal axis of an actuator.

Abstract: The present invention provides a low-cost electric clamping device in which a toggle linkage can be actuated by a small low-torque electric motor. The device includes a gear speed reducing mechanism connected to the electric motor, a linkage connected to the speed reducing mechanism, a clamp arm shaft connected to the linkage, and a body 2 for housing them. The linkage includes a crank link connected to a last-stage spur gear of the speed reducing mechanism, a cam follower link which is connected at one end thereof to the crank link and to which a cam follower moving on cam rail faces is rotatably mounted, and a driving lever to which the other end of the cam follower link is connected and which projects from the clamp arm shaft.

Abstract: A gas turbine component blank is shaped by clamping the gas turbine component blank into a fixture that accurately positions the gas turbine component blank in three dimensions. The positioning is accomplished against stops accurately machined into a base of the fixture, by first supporting the gas turbine component blank on one set of stops that prevents movement in the direction perpendicular to a plane of the base, and then operating a movable clamp to force the gas turbine component blank against other sets of stops that limit the movement of the gas turbine component blank in directions lying in the base plane. The clamp has a compound movement that simultaneously forces the gas turbine component blank against stops that prevent movement in orthogonal directions lying in the base plane. The gas turbine component blank is thereafter shaped, preferably by grinding the sides of the root precursor of the gas turbine component blank.

Abstract: An implement comprising a head part and a drive part adjoining the head part in a longitudinal direction. The drive part is associated with an actuating member which is drivable in opposite directions. The actuating member is coupled to a toggle lever mechanism via which mechanism an arm of a toggle-lever device is drivable.

Abstract: A parallel gripper includes a housing and two adjustable gripper base jaws which are displacably guided in a jaw guiding recess. The base jaws are moved relative to one another by a wedge hook gearing that is adjusted by a piston guided in the housing. The jaw guiding recess is provided with complementary configured guiding grooves. The ratio of the wall thickness of the housing between the base of the guiding grooves and the outside of the housing to the width of the housing measured vertically in relation to the direction of displacement of the base jaws is at least 0.2. The ratio of the width of inclined traction of the wedge hook gearing to the outside width of the base jaws is at least 0.4.

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 powered clamp includes a pair of moveable members which engage one another to maintain, at least temporarily, a locking position of an arm when actuating fluid pressures have been decreased or lost. In another aspect of the present invention, the apparatus is simplified by engaging a slide rod with a rotatable hub. Furthermore, the overall packaging envelope required by the clamp is reduced by aligning the transverse axis of the rotatable hub with a longitudinal axis of an actuator.

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: The clamping device for clamping work pieces comprises a box-shaped body, and an angularly movable clamping arm, operatively connected to an electric control actuator by a toggle-lever mechanism and an axially extensible thrust member. The toggle-lever mechanism comprises a connecting link having first and second link sections hinged on opposite sides of a crank member of the clamping arm, and to a screw and nut mechanism of the thrust member. The screw slides in an axial through bore which extends along the thrust member and through a hole in a hinge pin which connects the thrust member to the sections of the connecting link.

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: An actuator (10) for use in installing or extracting piles and the like has a common member (12) supported at (14) and having jaws (16) for gripping a pile. Within the block (12) a double-acting piston (18) is located alongside a space (20) for a control valve arrangement which provides hydraulic fluid, in various ways described, to create vibratory or impact forces from the piston (18). The piston and the valve arrangements are both removable and replaceable by alternatives, to modify the mode of operation of the actuator (10).

Abstract: A mower blade sharpener apparatus has an automatic reciprocating holder means to sharpen lawn mower blades conveniently with any stationary circular flat-faced grindstone with its driving motor affixed to a common base. A housing frame having open opposing sides contains a blade holder with upper and lower securing clamps and a V-shaped cradle. The housing frame is attached by a screw to a carriage automatically moved back and forth a limited distance on a pair of parallel rods to sharpen the lawn mower blade. The housing frame and carriage are driven by a pneumatic system designed with a reciprocating movement of approximately 4 inches in a cycle duration of approximately a second. An on/off pneumatic valve switch automatically shuts off the pneumatic pressure when a semicylindrical shield which covers the blade portion not being sharpened is rotated back away from the blade.

Abstract: A clamping device (1), particularly a machine vice (1), has a body element (2), a jaw (3) attached thereto, and an oppositely placed movable jaw, for displacement by a drawbar (4). The drawbar has a compression bar to be arrested at varying distances from the fixed jaw, and a force amplifying arrangement (5) acting on the spindle. The force amplifying arrangement includes at least one cylindrical tube (9) and at least two plungers (10, 11) that are movable in concentric cylinders. Two compression chambers are provided, an outer, low-pressure chamber (12) and a high-pressure chamber (14) acting on the clamping plunger (11) from the direction of the drawbar, wherein a functional connection is established between the two plungers so that at least one rod (18) having a smaller diameter than the diameter of the plungers and connected to the outer compression plunger (10) acts on the high-pressure chamber (14), which is filled with pressurising medium, preferably oil or liquid grease.

Abstract: A self-centering element for clamping workpieces via deflecting pins, which act between a drive element and self-centering slides. Deflecting pins, which are provided with grooves in which carrier prisms are arranged, are introduced in pairs into recesses in a housing in a plane located in parallel to the mounting surface of the element. The carrier prisms have wedge surfaces, which are slidingly guided in the grooves of the deflecting pins. The deflecting pins are controlled by pistons, which are arranged in the same plane but at right angles to the deflecting pins. The forces are transmitted beginning from the piston via the deflecting pins to the carrier prisms and then to the self-centering slides, which are connected to the carrier prisms and which move the clamping jaws.

Abstract: A modular fixture or holding mechanism that includes modular portions to be interconnected according to a plurality of combinations to provide a plurality of positioning orientations. A one of plurality of a first modular portion and one of a plurality of a second modular portion can be selectively positioned relative to one another to provide for a plurality of selected holding positions. Different selected modular portions may be selected to provide different holding positions.

Abstract: The clamping device comprises a box-shaped body provided with a clamping member movable between a forward position and a backward position. Control means are provided for controlling the movement of the clamping member; the control means comprise a thrust member operatively connected to the clamping member by an articulated quadrilateral system, and a toggle-link, in which the hinge point of the link, in the backward position of the clamping member are disposed on opposite sides of the thrust member. The device also comprises scraping means for cleaning the clamping member and to prevent the infiltration of dirt.

Abstract: The present invention provides a low-cost electric clamping device in which a toggle linkage can be actuated by a small low-torque electric motor. The device includes a gear speed reducing mechanism connected to the electric motor, a linkage connected to the speed reducing mechanism, a clamp arm shaft connected to the linkage, and a body 2 for housing them. The linkage includes a crank link connected to a last-stage spur gear of the speed reducing mechanism, a cam follower link which is connected at one end thereof to the crank link and to which a cam follower moving on cam rail faces is rotatably mounted, and a driving lever to which the other end of the cam follower link is connected and which projects from the clamp arm shaft.

Abstract: A fluid actuated parts gripper assembly is provided. The fluid actuated parts gripper assembly has a pair of opposable pivoting jaw members, a fluid driven actuator, first and second linkage structures, a sensor target, a mounting, and a sensor. The sensor target is coupled to the second linkage structure and is movable therewith. The mounting is located adjacent the sensor target, and the sensor is mounted on the mounting such that the sensor is configured to detect the sensor target.

Abstract: A power clamp for use in a manufacturing environment. The power clamp includes a unitized body having a bore in one end thereof The power clamp also includes a piston arranged within the bore and an end cap secured to the body on the end having the bore. The power clamp has a plurality of first links, one of the first links connected to the piston and at least one second link connected to the first link at a pivot point. A plunger is arranged within an orifice of the body and that plunger is connected to a second link. The power clamp also includes a plurality of identical pins with the pins connecting the links. The power clamp also includes a side plate connected to the body to enclose the clamp and protect it from the manufacturing environment.

Abstract: A powered clamp assembly is provided having an actuator, a cam member, a jaw arm, and a bearing member. The cam member has a camming surface and is driven by the actuator. The jaw arm is pivotable about an axis. The bearing member is attached to the jaw arm, as well as being engagable with the camming surface of the cam member. Movement of the cam member causes the camming surface to engage the bearing member which causes the jaw arm to pivot.

Abstract: The invention relates to a power-driven toggle-lever clamping device comprising a head part (1) and a drive part (5) longitudinally fixed to the head part (1). A reversibly driveable actuating member that is assigned to the drive part (5) is connected transmission-wise to a toggle joint (26, 27, 34, 36). The drive part (5) is embodied as an electric motor whose shaft is provided with a worm combing with a worm wheel positioned inside the head part (1). The electric motor drives the operating member, for example the clamping arm (42) of a toggle-lever clampine device, via the toggle joint (26, 27, 34, 36).

Abstract: A toggle lever clamping device for clamping a workpiece to a support frame includes 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 includes 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 a confronting stop provided on the same clamping arm.

Abstract: A clamp rod (5) is vertically movably inserted into a housing (3). The housing (3) has a lower end wall (3b) formed with a detecting hole (58) substantially concentrically with an axis of the clamp rod (5). The detecting hole (58) has a peripheral surface opened to provide at least one inlet hole (71, 72) for supplying compressed air. A detecting member (62) is vertically movably fitted into the detecting hole (58). The detecting member (62) has an outer peripheral surface provided with a closing surface (68) which closes an opening portion (71a, 72a) of the inlet hole (71, 72) and with a recess (69) which communicates the opening portion (71a, 72a) with the outside air. The clamp rod (5) has a downwardly oriented projection (5a). The projection (5a) is connected to the detecting member (62) so that it can make a relative movement radially.

Abstract: A tool (1) for centering and gripping a part (10) to be secured, having a through passage (10a) and sized for the tool (1), includes a guide member (3), at least one gripping element (4) mounted on the guide member (3) and a body (2) enclosing the drive and guide element of the tool (1). The guide member is mounted on a securement support having a support part (6) provided with a passage (7). The guide member (3) projects at the free end of the support part (6), the free end constituting the reference surface or support surface (9) of the part (10) to be secured whilst the body (2) of the tool (1) is gripped against a surface of the support opposite the support part (6).

Abstract: A clamping element is provided for clamping work pieces on machine tables and the like with a tiltably 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: Extensible gripper for clamping plastics material plates on thermoforming apparatus for on-line thermoforming the plastics material plates, in which supporting assemblies support slidably with respect to a central body, sliding blocks which can be driven to project from the side of the central body, thereby providing the gripper with a length which can amount to twice the length of the central body, while providing the required gripping mechanical force on the head portions of the plastics material plates.

Abstract: A power clamp for use in a manufacturing environment. The power clamp includes a unitized body having a bore in one end thereof The power clamp also includes a piston arranged within the bore and an end cap secured to the body on the end having the bore. The power clamp has a plurality of first links, one of the first links connected to the piston and at least one second link connected to the first link at a pivot point. A plunger is arranged within an orifice of the body and that plunger is connected to a second link. The power clamp also includes a plurality of identical pins with the pins connecting the links. The power clamp also includes a side plate connected to the body to enclose the clamp and protect it from the manufacturing environment.

Abstract: A reconfigurable fixture for workpieces is disclosed. It utilizes a flat surface magnetic chuck with modular workpiece supporting, locating and clamping elements that are carefully located on it and held by magnetic attraction to it. These elements are precisely located to hold the workpiece in spaced relation to the chuck surface. Some locating elements are mechanically fixed to the chuck for securing the workpiece from transverse movement on the chuck surface. Preferably, each of the supporting, locating and clamping members are fixed to separate steel bases for magnetic attraction to the chuck. Each base may also carry its own hydraulic actuator for height adjustment of a support element or for height adjustment and closure of a clamping element. These modular elements have locating slots or grooves or the like so that they can be selected from a storage magazine and located on a chuck by numerically controlled mechanisms.

Abstract: A clamp apparatus has a lower body. A rotary driving source driven by an electric signal, a pump mechanism having a pressure oil-sucking/discharging mechanism energized/deenergized by the rotary driving source, a cylinder mechanism provided with a piston for moving in an axial direction in accordance with supply of pressure oil, and an accumulator for retaining the pressure oil are integrally assembled to the lower body.