Abstract: A removable jaw assembly for a workholding apparatus having a base that defines a worksurface and a first longitudinal axis. The assembly includes an tower portion provided on the workholding apparatus that protrudes above the worksurface and defines a second longitudinal axis that is substantially parallel to the first longitudinal axis. The assembly also includes a removable jaw member that has a cavity that is sized to receive the tower portion therein such that the jaw member may be selectively longitudinally moved on the tower portion between a released position and an attached position. The tower portion includes at least one spring-biased latch member adapted to engage an engagement area formed in a wall of the cavity at right angles to the second longitudinal axis to selectively retain the removable jaw on the tower portion.

Abstract: A vise having machinable low profile removable jaws includes a stationary jaw attached between two movable jaws for holding two work pieces during a machining process. The stationary jaw is positioned adjacent to a pair of guide rails, which are mounted onto a base. The movable jaws are removably attached to a first and second slide member by a mating connection which is positioned below the work surface of the vise. The slide members are contained within a channel in the base. A screw shaft is disposed within a bore of the slide members and is contained within a tube and a sleeve which are telescopically connected together for protecting the threads of the screw shaft from metal chips and other debris. A tension mechanism is disposed in an aperture of the first and second slide members for controlling movement of the movable jaws. The base has interlocking edges for allowing vises positioned side by side to be mounted closer together.

Abstract: A tool is disclosed in which components can be grasped and secured using a single actuation motion. A mechanical system converts a single actuation motion into sequential motions at least in part mutually orthogonal. The advantages of this system are one-handed operation and ability to accommodate variations in dimensions of the components to be secured in the tool. A particular device is disclosed which is used in the handling of human prosthesis components during surgery.

Abstract: A tool for mating, clamping, and gluing under high pressure, two picture frame members, the ends of which have been precisely cut prior to clamping. This high pressure produces a stronger joint than is now available in existing clamps that only hold the adjacent times while the glue is setting. It also produces a faster glue setting time than conventional clamps since excess glue is squeezed out, thus increasing clamp efficiency by making it available sooner for the next glue joint. In addition, it embodies an optional vertical clamp, which, in conjunction with a transparent triangular plate, applies a vertical pressure on members that may have been slightly warped or inaccurately cut. The triangular plate is optionally used with complex profiles to distribute the pressure. This combination results in a tight aesthetic joint. Existing clamps on the market do not embody this feature.

Abstract: A removable jaw assembly for a workholding apparatus having a base member with a longitudinal slot therein. The assembly includes a movable support member that has a lower portion operably supportable in the longitudinal slot such that it can be selectively axially moved therein. The movable support member has an upper portion that protrudes from the slot for supporting a jaw member thereon. A jaw retaining member is attached to the upper portion of the movable support member such that it is selectively movable between a first position wherein the jaw member is nonremovably attached to the upper portion of the movable support member and a second position wherein the jaw member can be removed from the upper portion of the movable support member. An actuation member is provided on the base member for biasing the jaw retaining member to the second position when the movable support member is moved to a disengaged position.

Abstract: In a wide-opening vise having two movable jaws and a fixed center jaw, the movable jaws are easily removed and reset onto associated slides. The slides have upperly projecting bodies with pressure release latches for positively fixing the jaws in position on the slides. Further, a brake and off-set assembly is associated with one movable slide. The combination allows the second movable jaw, after the first movable jaw has engaged a workpiece, to engage and disengage from a workpiece without effecting the engagement of the first movable jaw with its held workpiece. At least two off-set positions are provided for the engagement and disengagement of the second movable jaw.

Abstract: In a wide-opening vise having two movable jaws and a fixed center jaw, the movable jaws are easily removed and reset onto associated slides. The slides have upperly projecting bodies with pressure release latches for positively fixing the jaws in position on the slides. Further, a brake and off-set assembly is associated with one movable slide. The combination allows the second movable jaw, after the first movable jaw has engaged a workpiece, to engage and disengage from a workpiece without effecting the engagement of the first movable jaw with its held workpiece. At least two off-set positions are provided for the engagement and disengagement of the second movable jaw.

Abstract: In a wide-opening vise having two movable jaws and a fixed center jaw, the movable jaws are easily removed and reset onto associated slides. The slides have upperly projecting bodies with pressure release latches for positively fixing the jaws in position on the slides. Further, a brake and off-set assembly is associated with one movable slide. The combination allows the second movable jaw, after the first movable jaw has engaged a workpiece, to engage and disengage from a workpiece without effecting the engagement of the first movable jaw with its held workpiece. At least two off-set positions are provided for the engagement and disengagement of the second movable jaw.

Abstract: A vise for clamping a workpiece against a stop includes a base and a clamping member. The base contains a cylindrical sliding element having an inclined surface, which engages and aligns with a surface of another cylindrical element that is perpendicular to the first-mentioned element and located in an aperture in the clamping member. Angular engagement of the mating surfaces creates both clamping and holddown forces on the clamping member.

Abstract: A pneumatic quick vise utilizes a compressed air source to control operation of its jaws for high speed clamping and releasing of working pieces at high efficiency. The vice include a piston operated by the compressed air source to drive a booster mechanism and driving a screw rod to operate the vice, and the vice further includes a pivot for its movable jaw at a reactive side to prevent upward raising of a working piece during clamping and a cushion arrangement at both sides of the piston to minimize impact from quick displacement of the piston in order to prolong service life and improve machining accuracy.

Abstract: A machine vise is provided with a body having a fixed jaw and a movable jaw which may be moved toward the fixed jaw by means of a tractively acting hollow screw spindle. A force amplifier is arranged below the fixed jaw and is operable by a pushing rod shiftably inserted in the hollow screw spindle. A common driving device rotates the screw spindle into and away from its clamping position. Upon a predetermined clamping force being exceeded the force amplifier is activated by the pushing rod. The movable jaw may be split in upper and lower portions.

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: 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: A machine vise that can serve multipurpose uses is constructed utilizing a cast base made so that it can be easily mounted for NC machining, or mounted on a swivel base, and can be used mounted on its sides or on one end. The cast base is made to simplify clamping to a tool table by providing an accessible ledge for clamping along the sides and ends. The ledge also provides a coolant drain trough. A support for the distal end of the vise screw is mounted to simplify manufacturing without losing precision operation. The same vise body can be adapted for use with interchangeable screws for manual operation of a movable jaw from either end of the vise or using a hydraulic actuator for clamping the movable jaw.

Abstract: A hold-down device for movable jaw of a vise comprises a driving block and a movable jaw member. The driving block is provided with a through hole having therein a rigid sleeve. The movable jaw member comprises therein a drive shaft in such manners that the drive shaft passes through the sleeve and that both ends of the drive shaft are able to rotate. Located between the sliding portion of the driving block and the sliding groove of the vise base is a predetermined clearance, within which the driving block moves upwardly. A screw is permitted to pass through the screw hole of the movable jaw member to press against the side adjacent to the driving block and the screw hole so as to permit the angle formed by the surface of the vise stand and the connection line, which is formed by the contact point of the sleeve and the drive shaft and the drive shaft axial line, to be greater than zero degree and smaller than 90 degrees.

Abstract: A vise comprises mainly a base, a sliding member, a movable base, and an urging member. The base consists of a long slot extending axially in the middle thereof and of a holding base located at upper portion of the rear end thereof. The holding base comprises at front end thereof a jaw. The sliding member comprises on front end thereof a cooperating block of a predetermined shape and at front end thereof a circular arc portion having an appropriate curvature radius. The movable base consists of a bevel face with hole having at rear end thereof a bevel fave with a cavity disposed thereon for placing and positioning an intermediate member and of a protruded block with the protruded arc portions of predetermined curvature radii. The urging member is composed of a screw and a top block comprising at rear end thereof a recessed arc portion having a curvature radius corresponding to that of the circular arc portion.

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 improved machine vise, particularly well suited for use on milling machines and the like, having an improved arrangement for securely holding workpieces of irregular shapes or several different, diversely sized workpieces simultaneously. The vise is provided with a fixed jaw and two movable jaws mounted in a side by side relationship such that each jaw is free to move back and forth into and out of a gripping relationship with the object being clamped. The two movable jaws are yoke driven on a shaft such that a single forward thrust of the yoke exerts a forward and downward pressure to move both jaws forward while at the same time allowing for a translational motion between said adjacent jaws. These jaws can thus simultaneously grip and secure individual workpieces of different dimensions or differently sized portions or cross-sections of the same workpiece. Each jaw may also be provided with individually mounted fingers that pivot into the best gripping relationship with the object being clamped.

Abstract: A machine vise holds two parts against a center mounting block, and has simultaneously moving jaws slidable on a vise body toward opposite sides of the center jaw for clamping. One of the jaws is driven through a torque limiting clutch to the drive screw to provide a preload on one of the parts, after which the clutch releases for final, high pressure tightening.

Abstract: A quick-change vise including a T-shaped clamp extending from within a jaw member which engages a T-shaped channel in a jaw blank to releasably secure the jaw blank to the jaw member. The jaw blank may be provided with a parallel bar or angle parallel to provided horizontal or angled supporting surfaces to a workpiece held in the vise. The jaw blank may be positioned in reversible positions on the clamp. Additionally, the jaw blank may be made of an extrudable metal such as aluminum.

Abstract: Disclosed is a vise for clamping a workpiece in an adjusted position during operation on the workpiece by a tool, particularly the cutting wire of an electric wire cut discharge machine. For maintaining accuracy of the clamped workpiece and still occupying a minimum of space by the vise within the working range of the machine tool the vise is provided with a first fixed jaw and a second jaw movable along ways forming a reference surface. Wegding abutment surfaces and abutting surfaces are formed on the bed of the vise and on the second jaw, respectively, which engage during clamping the workpiece for preventing bending of the ways which allows a low profile construction of the vise.

Abstract: A vise for use with a machining table having an elongated T-slot in its upper surface includes a stationary jaw and a jaw support transversely extending over the T-slot and clamped against the table in spaced relation to one another by a clamping device centrally extending through the jaw and jaw support into the T-slot. A movable jaw is mounted on the jaw support with its gripping surface facing the gripping surface of the stationary jaw and its opposite surface inclined to the table. A wedge member having an inclined surface conforming to the inclined surface of the movable jaw is located between the movable jaw and the jaw support. Adjustment of the vertical position of the wedge member relative to the table enforces a horizontal motion of the movable jaw to grip a work piece located between the jaws. An auxiliary base member with a T-slot in its upper surface is also provided upon which the vise may be alternatively mounted for portable free-standing use.

Abstract: A jig has a main body. The main body is provided with a rotatable engaging shaft. The engaging shaft is provided with a main body fixing portion actuator and a workpiece clamping portion actuator. The main body fixing portion actuator is provided with a main body fixing portion drivable by the main body fixing portion actuator. The workpiece clamping portion actuator is provided with a workpiece clamping portion drivable forward and backward by the workpiece clamping portion actuator. When the engaging shaft is rotated, attachment and detachment of the main body and clamping of a workpiece can be performed.

Abstract: A machine vise for holding workpieces on a milling machine or the like comprises a pair of movable jaws arranged to move in parallel and to cooperate with a fixed jaw for holding workpieces for machining. A yoke is pivotally mounted with respect to the jaws and operates to provide equal pressures for gripping with equal pressure separate workpieces or different parts of the same workpieces.

Abstract: A precision machine vise is provided with quick-change head members or means to facilitate the changeover from making one kind of part to another, preferably in equipment provided with computer numerical control. The precision machine vise is of the kind having obliquely oriented surfaces as an anti-cocking measure. One first part of the equipment supported by the base of the precision machine vise has an upstanding boss, and a second part of the equipment containing jaw plates in contact with the work has a vertical bore in which said boss fits, and there is a horizontal bore through the boss of the first part and through the second part, into and through which a locking-in means fits. The first part is provided with means to minimize play between the first part and the second. The second part mentioned above may be a disposable item. For use with a precision machine vise of the two-place type, there is also provided a changeable "fixed" central member, securable to the base via bolts accessible from above.

Abstract: A workpiece holding system utilizing an improved vise having jaws that remain parallel with the workpiece and introduce a downward force on the workpiece to retain it against a precision supporting surface with the system of this invention primarily intended for use in holding workpieces on EDM wire machines. Each jaw has a step at the bottom which is significant when used on a wire EDM machine as it provides the ability to "pick up" the location of the workpiece from four sides. The system includes a dovetail incorporated into the vise with the position of the dovetail being the same regardless of the size of the vise thereby making it possible to use two different vises in a vertical setup to hold elongated workpieces accurately and making it easy to change from one vise to another. A single adjustment block can be used for a number of vises thus reducing the overall cost of the system.

Abstract: When used as holder for tools for partial machining tasks or as clamping means for exchangeable tools, the clamping block for clamping workpieces or tools make it possible to carry out a rapid and precisely reproducible exchange of the object (7) to be clamped. The clamping block having a block base (1) and a clamping jaw (5) which can be displaced relative thereto comprises a fixed clamping jaw (3) and means (4, 4.2) for the at least approximately parallel guidance of the moveable clamping jaw (5) relative to the block base. The latter has an essentially L-shaped form with two legs (1.1, 1.2) of approximately equal length. One of these carries the fixed clamping jaw (3) and a nose-shaped supporting portion (4) having a wedge-shaped control surface (4.2) for the moveable clamping jaw (5) while the other has a table-shaped portion (8) on which means for lateral and transverse guidance of the moveable clamping jaw (5) are supported.

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 two station, single action vise has a body, with a fixed center block forming oppositely facing fixed jaws, and movable jaws at opposite ends of the body that are moved by operation of a vise screw toward one of the respective oppositely facing fixed jaws in the center of the body. The vise screw is spring centered and will yield to apply a preclamp with one of the jaws onto a piece part. The movable jaws are shown operated by a vise screw that has left-hand threads for operating one of the movable jaws and right-hand threads for operating the other movable jaw, so that as the screw is rotated both movable jaws move simultaneously toward the center block forming the fixed jaws. In this way two work pieces can be clamped by the movable jaws against the center fixed jaw. In order to preclamp piece parts under a spring load the screw is moved so it can shift axially slightly under spring load after preclamping one part until both movable jaws are positioned to clamp their respective piece parts tightly.

Abstract: A drive for a machine vice having a vice body (8), a fixed jaw (9) and a movable jaw (4), a drive spindle (1) rotatably mounted in a thrust block (6) at one end of the vice body adjacent the movable jaw, a slide or drive nut (29) for the movable jaw cooperatively engaging drive screw threads (30) on the spindle so that rotation of the latter actuates the movable jaw, these parts extending on one side of the thrust block (6), a threaded sleeve (11) mounted in the thrust block, an extension (13) on the drive spindle extending rotatably and slidably through the thrust collar, a chamber drive unit (15) threadedly engaged (14) with extension (13) at one end and threadedly engaged at the other end with crankshaft (16) driven at its outer end by a crank (3) so that the crank rotates the drive spindle.

Abstract: A machine vise that can serve multipurpose uses is constructed utilizing a cast base made so that it can be easily mounted for NC machining, or mounted on a swivel base, and can be used mounted on its sides or on one end. The cast base is made to simplify clamping to a tool table by providing an accessible ledge for clamping along the sides and ends. The ledge also provides a coolant drain trough. A support for the distal end of the vise screw is mounted to simplify manufacturing without losing precision operation. The same vise body can be adapted for use with interchangeable screws for manual operation of a movable jaw from either end of the vise or using a hydraulic actuator for clamping the movable jaw.

Abstract: A vise for clamping a workpiece in an adjusted position during operation on the workpiece by a tool, particularly the cutting wire of an electric wire cut discharge machine. For maintaining accuracy of the clamped workpiece and still occupying a minimum of space by the vise within the working range of the machine tool the vise is provided with a first fixed jaw and a second jaw movable along ways forming a reference surface. Wedging abutment surfaces and abutting surfaces are formed on the bed of the vise and on the second jaw, respectively, which engage during clamping the workpiece for preventing bending of the ways which allows a low profile construction of the vise.

Abstract: A quick-change vise including a T-shaped clamp extending from within a jaw member which engages a T-shaped channel in a jaw blank to releasably secure the jaw blank to the jaw member. The jaw blank may be provided with a parallel bar or angle parallel to provide horizontal or angled supporting surfaces to a workpiece held in the vise. The jaw blank may be positioned in reversible positions on the clamp. Additionally, the jaw blank may be made of an extrudable metal such as aluminum.

Abstract: A heavy duty vise having a base, a fixed jaw and an upstanding boss formed integrally with the base and movable jaw which has limited reciprocating movement between the boss and the fixed jaw. A threaded hole is formed in the boss and a cylindrical sleeve with cooperating fine threads on its outer diameter extends through the hole. The sleeve extends outwardly to a handle. A rod passes through the sleeve and has a forward end on which the movable jaw is carried. The rod has coarse threads formed thereon which cooperate with coarse threads on the inner diameter of the cylindrical sleeve. The rod also has a handle extending outwardly beyond the sleeve. Rotation of the rod handle provides coarse adjustment of the movable jaw and rotation of the sleeve handle provides fine adjustment of the movable jaw.

Abstract: A machine vise for clamping a workpiece between a stationary jaw fixed to a body, and a movable jaw provided on a movable member which is moved relative to the body by a rotating motion of a feedscrew member which is rotatably supported by a support portion formed on one of the body and the movable member, the feedscrew member having an externally threaded portion engaging an internally threaded member provided fixedly to the other of the body and the movable member. The feedscrew member includes a radially outwardly extending flange portion which prevents the feedscrew member from moving in the axial direction relative to the support portion, due to a reaction force which is produced upon clamping of the workpiece. The machine vise includes a strain detector device disposed between the support portion and the flange portion of the feedscrew member, for detecting an axial force which is exerted on the support portion via the flange portion and the detector device due to the reaction force.

Abstract: The invention relates to a machine tool vice having a vice body and a slide guided in the vice body, with a clamping mechanism working between the vice body and the slide, in which there are two jaws, which are connected with the vice body and the slide respectively and of which the fixed jaw is designed in a bridge-like design and secured such that it can be detached. The clamping mechanism is arranged beneath the clamping zone formed by the jaws, and the slide is arranged in a longitudinal recess, open at the top, and extending generally over the entire length of the vice body. The vice body or the slide is provided with several means of retention which can be used selectively for the jaws. Alternatively several interchangeable jaws be used selectively, and all jaws are mounted on the vice body and the slide such that they can be detached.

Abstract: A vise adapted to clamp a workpiece includes a support which has a slide surface, first and second jaws movable with respect to one another, and operable to clamp the workpiece, and wherein at least one jaw is slidable along the slide surface. A drive element is in driving connection with at least one jaw so as to at least move that jaw into engagement with the workpiece, and a drive mechanism is operable to drive the drive element. A stressing mechanism is provided for pressing the jaw against the slide surface upon the drive element driving the jaw into engagement with the workpiece.

Abstract: To make parts requiring machining with the workpiece vise-held in different orientations, there is provided a precision vise having first and second pairs of jaws, each pair having a member which is fixedly located with respect to a reference location. The invention includes use of a particular form of vise for holding two pieces whereby the screw shaft that rotates to open or close the jaws is tensioned during tightening, which improves accuracy by avoiding bending stresses. When used in conjunction with suitable numerical-control equipment, the vise of the invention greatly increases productivity in the machining of product parts of the kind indicated above.

Abstract: The toe member of a low-profile toe clamp is advanced down an incline at the working end of the clamp by a pair of horizontal hydraulic pistons, one on each side of the hold-down slot of the clamp. The toe member is provided with transverse pins which are overridenly engaged by inclined faces on the pistons, so that the horizontal movement of the pistons is translated to the inclined movement of the toe member and so that a stopping action is provided by eventual engagement of the pistons with the toe member.

Abstract: A hold down tool comprising an elongated body having a front surface engageable with a workpiece and a rear surface provided with embedded magnet means for retaining the hold down tool on the clamping face of a vise jaw. The rear face in which the magnet means is embedded is formed on a plane that is non-parallel with the front surface of the hold down tool so that the hold down tool provides a "pinching down" force on a workpiece engaged by the front surface of the hold down tool. The hold down tool is self-sustained.

Abstract: A vise having a base portion with two end abutments and a sliding block therebetween and a screw for moving the block into clamping relation with one of the abutments. The block and the base have a rail relationship for sliding of the block on the base, and the screw forces on the block to urge the block toward the sliding surface of the base. Also, a screw is disposed to one side of the block for holding it down on the base in the sliding relationship. The width of the block is less than the width of the abutments so that a clamp can be placed across the abutments but the block is free to move back and forth. Also, the block has a pin and a wedge which are forced upon by the screw for forcing the block downwardly on the base in the clamping action.

Abstract: A clamp effort intensifier that multiplies the manual effort used for clamping vise jaws onto a workpiece through the use of a cam that actuates the vise jaws together to provide adequate clamping forces while substantially reducing the manual effort necessary to achieve a safe clamp force. The effort intensifier acts to load the vise jaw through a heavy spring which deflects as the jaws are loaded. The amount of deflection can be used to indicate the clamping force exerted on the jaws. An interlock to the machine tool used will prevent operation of the tool until the clamp force exceeds a desired level.

Abstract: This clamping device comprises a fixed jaw and a movable jaw sliding on the body of the fixed jaw; it comprises furthermore a structure for receiving the reactions of the stresses exerted on the fixed and movable jaws, this structure having for this purpose a front part against which the fixed jaw bears and a rear part having therethrough a tapped orifice in which the threaded portion of the clamping screw of the movable jaw is meshingly engaged; the front part and the rear part of this structure are each formed by a flange, and these two flanges are connected to one another, in the central part thereof, by means of at least one stay-rod, parallel to the clamping screw, and in the lower part thereof opposite that where the clamping screw is located by at least one compression bar.

Abstract: A precision machine tool vise includes a body having a stationary jaw and a movable jaw mounted thereon. An actuating nut, operated by an actuating screw, engages the movable jaw and shifts the movable jaw towards and away from the fixed jaw. A cylinder housing is mounted on the vise body and bears against the outer face of the fixed jaw. The actuating screw extends through the cylinder housing and has a piston mounted thereon which is positioned within the cylinder housing. A control valve controls the flow of fluid to the cylinder housing and when actuated shifts the piston and screw towards the movable jaw. The reaction forces resulting from forward movement of the piston are transmitted from the cylinder housing to the fixed jaw and thereby prevent deflection of the fixed jaw.

Abstract: The invention relates to a device for clamping a workpiece lying on the table of a machine tool by means of two jaws, at least one of which is displaceable, said jaws being provided with mutually opposed parallel clamping surfaces, at least one of which is displaceable by a predetermined amount in the direction toward the table and parallel to its jaw.

Abstract: The connection of work aligning jaw units for a machine vise and from which chips and debris are excluded by means of chambers formed at the interengaged faces of two relatively movable members in order to house the workings thereof, one a mounting member fixed to the vise abuttment or slide and the other a floating member limitedly biased upward in parallelism and slideably engaged with the mounting member on an inclined plane that draws a work piece downward when clamped.

Abstract: A locking jaw machine vise which includes a fixed jaw rigidly mounted on a frame, and a movable jaw slidably mounted on ways or guides for movement toward and away from the fixed jaw. The sliding jaw is driven by an actuating nut and screw. The actuating nut has an inclined surface that interlocks with the sliding jaw to provide a downward force on the sliding jaw to prevent the sliding jaw from tilting when it is clamped. A set screw is provided on the device to limit the amount of movement of the movable jaw toward the actuating nut to minimize any tendency of the jaw and the nut to bind on the ways or guides used for the sliding jaw.

Abstract: A precision machine vise having fixed and movable jaws, the movable jaw being actuated by a traveling nut having a lug which extends into a recess formed in the movable jaw. The lug and movable jaw having opposed force-transmitting surfaces which are angled downwardly and which have a preloaded spring interposed between them so that force is resiliently applied both to a work piece between the jaws and to the horizontal way surfaces which support the movable jaw. The spring provides slight articulation of the movable jaw with respect to the traveling nut permitting self-alignment of the jaw with the engaged surface of the work piece. The spring, because of its preload, causes the movable jaw to bear resiliently against the horizontal way surfaces even prior to engagement of the work piece. The preloaded spring serves, in addition, to preclude any play between the lug and the movable jaw or any looseness in the drive system which might develop during the life of the device.