Abstract: A door seal apparatus for a laser operating station, comprises a fixed wall with an opening, a turn table device with a turn table wall positioned within the opening, the turn table device having at least two positions in which the turn table wall is substantially parallel and coplanar with the fixed wall, with a gap existing between the fixed wall and turn table wall, cylinders for driving a first plate in a first direction over a first portion of the gap, and a cam plate for operationally engaging the first plate to a second plate and for driving the second plate in a second direction over a second portion of the gap as the first plate is driven in a first direction, wherein the first and second plates prevent direct light leaks from the first and second portions of the gap.

Abstract: Power actuated pull clamp having piston actuated external side links for pulling a pivoted clamp arm into clamping position. A generally cylindrical body having an external adjustable mounting thread has longitudinal side flats accommodating the actuating links within the thread circumference.

Abstract: A two-station, single action device has a body, with a fixed center block forming oppositely facing fixed jaws. At opposite ends of the body, movable jaws are moved toward and away from the fixed center block simultaneously using an actuator drive. The actuator drive has a longitudinal actuator axis and a first member joined to the first movable jaw and a second member joined to the second moveable jaw. A longitudinal power drive joined to the first and second members drives the first and second members in opposite axial directions to move the movable jaws simultaneously toward the fixed jaw. The first member and the second member further rotate about the longitudinal actuator axis in a first rotatable direction to move the movable jaws simultaneously toward the fixed jaw and rotate in a second rotatable direction to move the movable jaws simultaneously away from the fixed jaw.

Abstract: Enclosed rotatable head power clamp has an adapter mounted on a base surface between a power cylinder and a clamp head with an actuating piston rod extending through the adapter guided by rollers in tracks formed in bifurcated hollow side plates completely enclosing the actuating linkage for a pivoted clamp arm. The clamp head connection to the adapter can be adjustable indexed to any of eight angular operative positions about the axis of the piston rod.

Abstract: A hydraulically operated device including a single-acting cylinder having a piston for operating a working tool, a pressure chamber for applying a hydraulic pressure to the piston from an original position to an operated position, and a return spring for biasing the piston toward the original position. The device includes a hydraulic pump for delivering a pressurized fluid to be fed into the pressure chamber of the cylinder, and an automatic drain valve for inhibiting the pressurized fluid from being discharged from the pressure chamber while a difference by which a delivery pressure of the pump is higher than a pressure in the pressure chamber exceeds a predetermined value. When the difference becomes smaller than the predetermined value, the automatic drain valve is operated to allow the pressurized fluid to be discharged from the pressure chamber. Thus, the automatic drain valve automatically drains the pressure chamber when the pump is turned off.

Abstract: A hydra-jack screw apparatus is provided for exerting a force against an object, for adjusting the magnitude of the force exerted against the object, and for providing a visual indication of the magnitude of the force exerted against the object. The apparatus is comprised of a base member housing a piston chamber, a jack screw extending from the bottom of the base member, a fluid pressure gauge mounted on the base member, and a pair of pistons received in the piston chamber for reciprocating movement. One of the pistons has a piston rod that extends through a center bore of the jack screw and engages against an object against which a force is to be applied. The second piston has a piston rod that extends from the piston chamber of the base member and is attached to a manual forced adjusting knob. A volume of fluid is contained in the piston chamber between the first and second pistons, and as the manual knob is turned, the pressure of the volume of fluid is adjustably increased or decreased.

Abstract: A unit is provided for grasping and clamping generally circular shaped parts such as lenses, comprising a central body on which three grasping and clamping elements are mounted adapted to bear tangentially on said part at three points or regions of tangential contact forming, pairwise, angles greater than 90.degree., one of the grasping and clamping elements being arranged to lie on the axis of said central body at one end of a movable central push rod, the other two said elements being arranged symmetrically with respect to said axis at the distal end of two levers, the push rod being urged by at least one clamping spring in the axial clamping direction, and the other two elements being urged to rotate in the direction of clamping by at least one lever-action producing spring, release of clamping being obtained by application of fluid pressure to a piston adapted to operate in opposition to said clamping spring.

Abstract: A spar assembly jig for tack-free positioning of aircraft spar components for subsequent fastening at a second location. Pneumatically operated clamps are mounted on the frame of such jig. The spar components are laid up in such jig and the clamp closed thereon to hold the members together as opposed to the prior art method of securing such components together by temporary fasteners or tacking. The assembly jig and so-assembled and clamped spar components are then transported by overhead crane to an automatic riveting machine. The riveting machine has a jaw defined by a spindle and anvil which fits above and below the jig assembly. The clamps have a swing-away feature such that as the spindle and anvil approach, the clamp swings out of the way so that such machine can drive a rivet through endcap and web at or near the spot vacated by the swing-away clamp. The machine then moves on and the clamp re-closes on the spar components.

Abstract: Apparatus for releasably clamping a range of sizes of complex shaped articles having an upright web and laterally disposed upper and lower flanges. A first set of upper and lower flanges of an article placed on a work platform extends towards a first edge of the platform and a second set of upper and lower flanges extends towards a second edge thereof. One C-clamp on one side of the article terminating at a tip end is movable between an inactive position distant from the work platform and an active position at which the tip end grippingly engages one of the lower flanges of the article. As the C-clamp moves between the inactive and active positions, the tip end follows a path other than a continuous smooth arc so as to avoid striking the upper flange of the article. Another C-clamp, similarly constructed and operated, is provided on the other side of the article.

Abstract: A swing clamp apparatus adapted to be mounted adjacent a work surface includes a housing provided with a bore defining a longitudinal axis, and a piston received within the bore and being movable in the direction of the longitudinal axis. A clamping arm is supported on the piston for movement therewith between a clamping position and a releasing position. A first passageway is provided for delivering hydraulic fluid from a source of pressurized fluid to the first bore section of the housing to move the piston in a first direction and additional structure shifts the piston in a second direction opposite the first direction. The passageway includes a plurality of external ports formed in the housing and a manifold with which the plurality of ports communicate to permit fluid to be delivered to the first passageway, and a number of plugs are used for plugging any of the plurality of ports not used during delivery of fluid to the passageway in order to prevent leakage of fluid from the manifold.

Abstract: A clamping device including a clamp housing a generally horizontally extending cylinder bore that opens into an upwardly and rearwardly sloping guide bore formed in a front portion of the clamp housing is disclosed. A clamping member is shiftably mounted within the guide bore and a piston is shiftably mounted within the cylinder bore. The clamping member is formed with a groove into which a projection, carried by the piston, is fitted. By this arrangement, movement of the piston forces the clamping member to shift in an inclined direction between clamping and unclamping positions.

Abstract: An offset powered toggle clamp which is very compact and in which the entirety of the actuating mechanism is fully enclosed so that it is sealed from contaminants, and can be permanently lubricated. The clamp also accommodates various clamping arm locations and orientations for different applications.

Abstract: A fluid-actuated clamping device is adapted for releasably clamping and holding an item in a desired position at a desired location, with the clamping mechanism or sub-assembly being capable of being completely retracted into the body of the clamping device before and after clamping engagement of the item. The preferred clamping device is economically and conveniently converted between horizontal and vertical clamping applications due to its great degree of interchangeability of components in both of such applications.

Abstract: A vise assembly providing clamping of workpieces and pantographic displacement of opposed vise jaw members in parallel in a direction generally transverse to the longitudinal axis of the workpiece. The vise assembly is a shuttle vise, and the pantographic mounting assembly is used with band saw apparatus in production cutting of bar stock, which tends to warp along its longitudinal axis. The vise assembly includes a clamping mechanism for holding the movable vise jaw against the vise ways to prevent diverging of the vise jaw faces and urging of large diameter workpieces up and out of the gripping jaws.

Abstract: A fluid pressure actuated edge clamp employing inclined guide tracks for a clamp jaw advanced and retracted by linkage which substantially eliminates side loading of the piston from reaction loads during clamp engagement. The linkage is reaches an aligned end position with the piston rod in clamping position and to accelerate advance and retraction of the clamp jaw in moving to and from clamping engagement.

Abstract: An apparatus for precisely forming curved surfaces on a wooden workpiece in which the workpiece is automatically centered on a work table which is controllably movable inwardly and outwardly relative to a rotating cutter. The rotating cutter is slidably mounted withing a supporting frame so that the cutter can be controllably moved past the workpiece as the workpiece is moved inwardly and outwardly relative to the cutter. A template and a template follower precisely controls the movement of the table and the workpiece relative to the cutter to produce precisely formed curved surfaces on the workpiece.

Abstract: A spar assembly jig for tack-free positioning of aircraft spar components for subsequent fastening at a second location is provided. Pneumatically operated clamps are mounted on the frame of such jig. The spar components are laid up in such jig and the clamps closed thereon to hold the members together as opposed to the prior art method of securing such components together by temporary fasteners or tacking. The assembly jig and so-assembled and clamped spar components are than transported by overhead crane to an automatic riveting machine. The jig and spar components are lowered into place before such riveting machine, which has a jaw defined by a spindle and anvil which fits above and below the jig assembly. The clamps have a swing-away feature such that as the spindle and anvil approach eg.

Abstract: A power clamp is provided that clamps the workpiece when the piston rod is retracted into the cylinder housing thereby preventing damage to the rod and clamp components that could occur from weld flash and other debris created while operations are performed on the workpiece. Other features are disclosed which increase reliability and enable a variety of different arms to be used with the basic clamp construction.

Abstract: A workpiece holder includes first and second workpiece engaging members, one of which is rotatable with respect to the other. A rotary actuator drives the rotatable workpiece engaging member between two positions relative to the other workpiece engaging member. The rotatable actuator includes opposed, radially extending vanes mounted on a rotatable shaft extending through a hollow, closed body. The rotatable workpiece engaging member is fixedly connected to and rotatable with the rotatable shaft. The vanes are disposed in the hollow body and respectively create a pair of chambers between themselves and circumferentially spaced legs formed in the body and extending radially inward into the interior cavity of the body toward the rotatable shaft. Pressurized fluid is alternately supplied to and exhausted from each pair of chambers to exert force on and rotate the vanes, the rotatable shaft and the rotatable workpiece engaging member between the two positions.

Abstract: A hydraulically operated device including a single-acting cylinder having a piston for operating a working tool, a pressure chamber for applying a hydraulic pressure to the piston from an original position to an operated position, and a return spring for biasing the piston toward the original position. The device includes a hydraulic pump for delivering a pressurized fluid to be fed into the pressure chamber of the cylinder, and an automatic drain valve for inhibiting the pressurized fluid from being discharged from the pressure chamber while a difference by which a delivery pressure of the pump is higher than a pressure in the pressure chamber exceeds a predetermined value. When the difference becomes smaller than the predetermined value, the automatic drain valve is operated to allow the pressurized fluid to be discharged from the pressure chamber. Thus, the automatic drain valve automatically drains the pressure chamber when the pump is turned off.

Abstract: A method of making an elastomer lined composite vessel or portion of such vessel is disclosed. The method comprises causing a thin, tacky ribbon comprising an elastomer (preferably curable) to continuously so encircle a center rotational axis of a madrel as to adjacently position and tack together integral segments of the ribbon substantially circumferentially relative to this center rotational axis thereby forming a layer of the elastomer about the mandrel which may be the shell of the pressure vessel in case of internal application of the insulator or may be a workpiece around which the shell is built over the so-layed ribbon.

Abstract: Several embodiments of a power clamp are disclosed which enable one arm or a pair of arms to be actuated for linear or rotational movement over a selected range of motion, depending on the manner in which the arm or arms are connected to the power clamp. Several embodiments, in addition to permitting actuation of various arms through various ranges of motion, further enable the arm or arms to be rotated about a transverse axis to a desired angular position, thereby further enhancing the adaptability of the power clamp device.

Abstract: Hydraulically actuated quick release base mounted clamp particularly capable of use for clamping interchangeable production heat treating induction coils to produce intimate pressurized electrical conductive contact between elongated base mounted and induction coil bus bars. A central short stroke hydraulic cylinder produces only slight pivotal clamping engagement of dual laterally spaced clamp arms, the pivots of which can be linearly laterally retracted to clearance position upon release of hydraulic pressure. A cross shaft having a flatted engagement by the rigidly mounted cylinder piston head and a pivot cross shaft having flatted ends adapted to slide in slotted keyways upon release of actuating pressure provide for lateral movement of the clamp arm assembly to a clearance position while the actuating cylinder remains in its fixed position.

Abstract: In construction of a metalworking vise having a fixed base, a stationary jaw mounted atop the front end portion of the fixed base, a slide jaw arranged facing the stationary jaw, and a piston movable into a hydraulic chamber to raise its fluid pressure, a holder shaft provided at its front end with an axial extension defining the hydraulic chambers and a force magnifying mechanism is arranged in the fixed base near the stationary jaw. The specified location of the force magnifying mechanism allow generation of a large clamp force at high precision in clamping position without causing any substantial warping of the fixed base.

Abstract: An apparatus for providing a reciprocating motion. The apparatus has a housing block that contains twin piston guides in spaced apart relationship to one another. The piston guides each contain a piston that has a gear rack. The gear racks are connected by a pinion gear so that the movement of one piston will cause an equal and opposite movement of the other piston. The movement of the pistons is controlled by the application of a fluid pressure to one or both of the pistons. The travel of the pistons is limited by a mechanical stop at one end and a fluid cushion device at the other end. Tools for the altering of a workpiece may be attached to one or both ends of the pistons. In one embodiment, the apparatus is subjected to a rotary displacement achieved through the linear motion of one of the pistons.

Abstract: A power clamp having linear bearing tracks for actuating toggle linkage characterized by a combination of fixed and moving cover elements completely enclosing the bearing tracks to prevent intrusion of foreign materials.

Abstract: A power drive and transmission unit for self centering clamps and chucks has a housing with a cylindrical bore and a piston which is rotatably mounted therein and is acted upon by two linear operating, piston cylinder drives to obtain rotation of the rotating piston in one or the opposite direction. Two or three linearly moving central slide elements which are mounted on said housing for obtaining the centering chuck action elements are connected to the rotating piston by means of pins running in oblong slots in order to convert the rotation of the rotating piston into oppositely linear motion of the slide elements, so that they move towards or away from a common center depending on the direction of rotation of the rotating piston.

Abstract: A power clamp is provided that clamps the workpiece when the piston rod is retracted into the cylinder housing thereby preventing damage to the rod and clamp components that could occur from weld flash and other debris created while operations are performed on the workpiece. Other features are disclosed which increase reliability and enable a variety of different arms to be used with the basic clamp construction.

Abstract: A proximity switch assembly (10) for signaling the location of a movable member (36) at either of opposite end limits of movement relative to a stationary frame (44, 46) includes a compact elongate housing (58) adapted to be mounted on the frame to extend along the path of movement of a power driven member (32), such as the piston rod of a hydraulic cylinder, which shifts the movable member between its end limits. The proximity switch is fixedly mounted in the housing and carries a switch actuating member (68) mounted for sliding movement over a relatively short distance sufficient to move an actuating target (74) into and out of actuating proximity of an air core proximity sensing coil (120) within the housing. Lost motion abutment shoulders (70, 72) on the switch actuation member and power driven member (54) move into engagement with each other as a power driven member approaches each end of its stroke.

Abstract: The invention relates to a clamping device for the clamping of at least one piece of tooling, for instance an upper tooling or a press, which device comprises:two clamping jaws moveable towards and away from one another, between which the tooling can be clamped,pressure means, for instance at least one hydraulic cylinder for pressing the clamping jaws towards one another with force at energizing thereof, andat least one locking element present between the clamping jaws for co-action with an edge present on the tooling,such that the tooling in the absence of energizing of the pressure means can be pushed with at least one edge over the locking element, hook over the edge, and thus prevents the tool from falling,and is characterized in thata resilient strip, which is attached between the clamping jaws to one clamping jaw and which as a result of its own resilience lies in untensioned state at a distance from a pressure surface of this clamping jaw, whereby in the absence of energizing of the pressure means, the

Abstract: A swing clamp for clamping work pieces to a fixture is mechanically actuated. The clamp has a body with a base. The base has a threaded hole in it. A mandrel is carried by the body. A clamp member is mounted to one end of the mandrel. A shaft extends through the mandrel and engages a threaded hole in the base. A translational device changes rotational movement of the shaft to linear movement of the mandrel. A guide causes the mandrel to swing about 90 degrees during this linear movement. This releases and actuates the clamp member.

Abstract: A vise has a stationary jaw, a movable jaw, an outer hollow high-speed spindle threaded in the fixed jaw and formed with a radially open entrainment recess, and an inner low-speed spindle threaded in the outer spindle. A hand crank is rotationally fixed on an inner spindle and an entrainment pin is displaceable transversely in the inner spindle between an entrainment position engaged in the recess and rotationally coupling the inner spindle to an outer spindle and a freeing position clear of the recess and permitting relative rotation of the spindles. A switching piece on the inner spindle can operate a bolt to press the operating bolt into the camming surface in a low-speed position of the switching piece and thereby pull the entrainment pin out of the recess to decouple the spindles and in a high-speed position frees the operating bolt from the camming surface and couples the spindles to each other.

Abstract: There is disclosed a clamp device for clamping a workpiece, e.g. a ceramic shaped body having a surface curvature. Support members are mounted on the base frame to support the workpiece thereon, and are adapted to swing about predetermined rotational axes. First clamp members are mounted on a base frame and adapted to swing about predetermined rotational axes. Second clamp members are mounted on a sub-frame, which is movable relative to the base frame, and are adapted to swing about predetermined rotational axes. The second clamp members can be moved toward the first clamp members to clamp a workpiece therebetween.

Abstract: An air operated vice includes a base having a hollow interior. A pair of jaws, one being fixed and one being movable, are provided on an upper surface of the vice. One or more cylinders are provided in the hollow interior of the base. A rear end wall of the cylinders is pivotally connected to the base. A lever is pivotally provided in the base about a pivot axle. An upper end of the lever is engaged with a lower surface of the mobile jaw. A length of an upper portion of the lever is shorter than a length of a lower portion of the lever. A lower end of the lever is pivotally connected to a free end of the piston rod so that the lever is actuated to rotate by the piston rod and the mobile jaw is actuated to move by the lever.

Abstract: A variable height die clamp adjustable through threaded knob on a single T-headed bolt engageable with the T-slots of conventional machine table. A clamp arm pivotally connected at the centerline of the bolt through a pair of side brackets and a bolt guide has a spaced end raised through a reaction connection of the side brackets with the machine table surface and through a transverse hydraulic piston having a flat wedge surface adapted to engage a flatted surface on a longitudinal locking pin.

Abstract: Work holder apparatus for clamping large workpieces in position to carry out finishing operations comprising a base support unit, spaced parallel upright support members disposed thereon and extending upwardly to define a generally channel-shaped opening for insertion of a workpiece in the channel, a movable clamping member mounted on one of the support members including a workpiece-engaging surface in facing relation to the other of the support members, and clamping control means for horizontally advancing the clamp member toward and away from the other of the frame members.

Abstract: The present invention relates to a modular, multiple actuator assembly for providing a clamping force on a machine tool vise or other clamp which includes a plurality of parallel operating pistons and cylinders providing an additive force to a movable clamp jaw. The modular assembly can be installed easily in existing vises as well as in new vises. The modular actuator has a number of individual piston-cylinder assemblies acting to be additive in force so a high clamping force can be obtained using standard air pressure supplies found in machine tool shops and factories.

Abstract: A balancing apparatus for balancing a high precision magnetic disk drive includes a plate having a circular aperture in which three mounting surfaces grip a precision mounting ring on the disk pack to be balanced. The plate is mounted on a pivoting platform so that the pack can be lowered into the aperture, gripped by the mounting surfaces and then flipped into a horizontal position for balancing such that an operator has access to the disk pack to add balancing weights through the circular aperture.

Abstract: A hydraulic clamp, which actuates a clamping means by a hydraulic pressure of a hydraulic cylinder, has a clamping actuation oil chamber, a piston and the clamping means arranged in a cylinder body of the hydraulic cylinder in this order in the axial direction of the hydraulic cylinder. The clamping means is adapted to be shifted expansively and contractively between advanced position clamping and a retracted position (unclamping) which are at different distances from the axis of the hydraulic cylinder. The clamping means is adapted to be advanced from the retracted position to the advanced position in an early stage of the application of a hydraulic actuation force in the clamping actuation oil chamber, by which the piston is hydraulically actuated, and the clamping means is adapted to be actuated for clamping by a latter stage of the hydraulic pressure in the clamping actuation oil chamber.

Abstract: A vise has a stationary jaw, a movable jaw displaceable longitudinally toward and away from the stationary jaw, an outer hollow high-speed spindle threaded in a nut on the fixed jaw and formed with a radially open entrainment recess, and an inner low-speed spindle threaded in the outer spindle. A piston-and-cylinder unit on the movable jaw has primary and secondary pistons respectively engaged by the outer and inner spindles. A hand crank is rotationally fixed on the inner spindle and an entrainment pin is displaceable transversely in the inner spindle between an entrainment position engaged in the recess and rotationally coupling the inner and outer spindles to each other and a freeing position clear of the recess and permitting relative rotation of the inner and outer spindles. This entrainment pin is formed with a longitudinally directed camming surface.

Abstract: In a hydraulic clamp adapted to fixedly secure an object such as a die, a workpiece and the like strongly to a machine tool such as an injection molding machine, a press machine and the like by means of multiplication action of a wedge,a drive chamber is formed in a clamp housing with its front end open and a clamp arm is inserted in the drive chamber to be vertically pivotable,a driving wedge is inserted between a wedge retaining surface defining an upper part of the drive chamber and a driven portion formed at a top of the clamp arm from behind and adapted to be moved longitudinally reciprocatively by means of a hydraulic cylinder, anda sliding shuttle member is interposed between the sliding contact surfaces of the driving wedge and of at least one of the wedge retaining surface and the driven portion to be slidable in a forward and backward direction within a given range.

Abstract: A clamping device, more particularly a toggle lever clamping device is devised for clamping workpieces and comprises an actuator cylinder (3) with a mounting head (23), said mounting head protruding from the piston rod and being provided with the control mechanism for the clamping arm (24) which is linked to said mounting head and, furthermore, two pressure medium supply lines and sensors for the final position with connecting lines. A positioning rod (5), provided with positioning elements (4), is arranged on the free end (1) of, and parallel to, the piston rod (2) and directed toward the actuator cylinder (3). The positioning path (W) of the positioning elements (4) extends within the region of the actuator cylinder (3). At least two sensors (6, 6') for the end position are located in the region of the positioning path (W).

Abstract: This invention relates to a clamping device for plates (3, 4) comprising at least one clamping head (5) including a body (11), a clamping member (12) adapted for rotating around a fixed axle (22) and rotation means (23) for rotating said clamping member (12) around said fixed axle (22) comprising at least a link (24) pivotably fixed to said clamping member (12), a carriage (28) provided with a roller (30) moveable substantially linearly along at least one guiding ramp (31) having a curved contact surface for engagement with the concave roller the curvature axis of which are located on one side of the fixed axle (22) with respect to the plane (45) defined by the central axis (26') of the link (24) and the central axis (29') of the roller (30).

Abstract: The present invention relates to a shearing machine in which the upper shearing blade can be easily adjusted and positioned. The upper blade is held on a pivotal plate member which is pivotally held on a ram by means of a hinge means to be rotated to adjust of the position of the upper blades. In addition, a hold down member is provided for holding a work-sheet. The hold down member is arranged to be urged by a toggle joint to hold the work-sheet at a reduced speed with an increased force after coming into contact with the work-sheet. A scrap removal member is also included in the shearing machine such that scraps can be easily removed without mingling them with the finished sheets. The scrap removal member removes scrap without idle time between feeding the work-sheets to be sheared. The shearing machine is so arranged that scraps are taken away directly to a scrap box as soon as the work-sheet has been completely sheared into its finished product.

Abstract: A cylinder type hydraulic clamp having a clamping mechanism is adapted to be actuated by means of a hydraulic cylinder, and has a piston rod projected through the cylinder body of the hydraulic cylinder and is equipped at its leading end portion with the clamping means. The clamping means is arranged concentrically with the piston rod and is adapted to be resiliently urged by means of a contraction spring toward its contracted position to be pushed by means of an expansion slant cam toward its expanded position. At the time of the clamping actuation, when the clamping means is hydraulically actuated toward the cylinder body through the piston and the piston rod, the clamping means is first expanded diametrically by means of the expansion slant cam against the resilient force of the contraction spring and then a member to be clamped is fixedly pressed between the cylinder body and the clamping means expanded as mentioned above.

Abstract: The power operated clamp secures a workpiece relative to a work piece support and includes a cylinder having a reciprocal piston and connected piston rod projecting from the cylinder. A bifurcated hollow housing is connectable to the cylinder and has an elongated internal guide slot with a free end of the piston rod extending within the guide slot. A pair of coaxial apertures having a common axis offset and the perpendicular to a longitudinal axis of the guide slot are formed in the housing. A rod end is connected to the free end of the piston rod for reciprocal movement and is slidingly guided within the guide slot. A pivot pin is rotatably disposed within the coaxial apertures for angular movement about the common axis and has an end extending externally from the housing and a lever arm extending internally within the housing.

Abstract: A fluid-operated actuator for collets, vises, chucks and other workpiece engagement devices, for example, the actuator having a piston which moves the engagement device toward the workpiece with a force equal to product of the area of the face of the piston times the pressure of a fluid applied to the face. When the engagement device has engaged the workpiece, additional, relatively slight movement of the piston causes a force multiplying mechanism to provide increased engagement force without increasing the pressure of the actuating fluid. The overall travel of the actuator mechanism is not limited by the force-mulitplying mechanism which begins to function only after the unrelated distance of travel of the engagement device to the workpiece. Thus, for example, compressed air at ordinary shop pressures may be used to actuate collets or chucks on automatic lathes or the like to provide relatively high clamping forces.

Abstract: Power actuated cam clamp having mounting base with side flanges for pivotally mounted cam surfaced clamp arm, cam roller actuating link, and fluid cylinder elements. Uniform cam rise providing self-locking angle over substantial clamp range and rapid travel 90.degree. opening are accomplished with direct piston rod actuation of roller link.

Abstract: A railroad rail cold sawing device for securement about a railroad rail having a central web and flanges connected to opposite ends of the web, includes a sawing section having a sawing blade; a drive section; a spline drive shaft for removably connecting the drive section and the sawing section to cause rotation of the saw blade; and at least one clamping assembly for removably clamping the sawing section and the drive section to the railroad rail, each clamping assembly including a support for supporting a respective section on an upper one of the flanges, a fixed clamping leg fixedly secured to the support for clamping one side of the central web, a pivotal clamping leg pivotally secured to the support for clamping an opposite side of the central web, and a piston-cylinder drive assembly connected to the support and the pivoting clamping leg for pivoting the pivoting clamping leg into clamping relation with the opposite side of the central web to secure the respective section to the railroad rail.

Abstract: A fixture latching mechanism for mass terminating a printed circuit test fixture to a test head probe field wherein said fixture latching mechanism is comprised of simultaneously functioning pulldown towers, each of which further comprises a housing having an internal wall for guiding a vertically moving rack containing a horizontally and forwardly biased pulldown which engages the fixture as the rack is powered downward and which disengages from the fixture as the rack is powered upward. Preferably, the disengagement of the pulldown from the fixture is produced by a caming action on a cam follower attached to the rear portion of the pulldown as the cam follower engages a cam system positioned in the upper regions of the housing's internal wall.