Abstract: An object of the present invention is to propose a device capable of automatically insetting a tube into a bending die instead of doing so manually, even if the shape of a product exceeds two meters in length, the device comprising a bending die having a tube insetting portion, and a traveling body that includes a guide mechanism guiding a tube to an upper portion of the tube insetting portion, an auxiliary guide mechanism keeping the tube in the upper portion of the tube insetting portion, a insetting roll insetting the tube in the tube insetting portion, a pair of drive wheels rolling along lower rails, and a drive mechanism, wherein the traveling body moves and insets a tube into the bending die while having the auxiliary guide mechanism and the drive wheels grip the bending die.

Abstract: Pressure die systems configured to be used in a tube bending machine having a machine frame. The pressure die systems include a system frame, a first pressure die, a second pressure die, and a pivot assembly. The first pressure die is supported on the system frame. The second pressure die is spaced from the first pressure die and supported on the system frame. The pivot assembly is moveably mounted to the system frame between the first pressure die and the second pressure die. The system frame pivots about the pivot assembly. The pivot assembly is configured to move relative to the system frame to different positions between the first pressure die and the second pressure die to define different pivot positions for the system frame.

Abstract: The subject matter of this specification can be embodied in, among other things, a rotary actuator that includes a housing defining an arcuate chamber comprising a cavity, a rotor arm configured for rotary movement, an arcuate-shaped first piston disposed in said housing for reciprocal movement in the arcuate chamber, where a seal, the cavity, and the piston define a pressure chamber that includes part or all of the arcuate chamber, and a portion of the piston contacts the rotor arm, and a rotor assembly rotatably surrounding said housing and having a rotary output tube about the axis, wherein the rotor arm extends radially outward to the rotary output tube and the rotor arm is coupled to the rotary output tube.

Abstract: The machine for cambering, shaping, bending or curving a bar along a bending axis includes an arm, a bending shank supported by the arm, a bending head including a bending lug that is rotatable relative to the bending axis, and a feeding station for moving the bar along an axis of travel and across the bending shank. The bending head also includes: a first connecting rod supporting the bending lug and having a head, a second connecting rod having a head, the heads being coupled so as to rotate relative to a hinge axis perpendicular to the axis of travel, a first driver for translating a leg of the first connecting rod along an axis parallel to the axis of travel, and a second driver for translating a leg the second connecting rod along an axis parallel to the axis of travel.

Abstract: A die and counter-die type bending machine for right- and left-hand bending an elongated piece (P) has a roller-shaped die (1) provided with a partial circumferential groove (2) that is interrupted at its two ends, the die (1) being driven by the shaft (0) of a motor, and a pair of counter-dies (25, 26) being carried by respective counter-die support members (19, 20) pivoted on a turret (11) that is rotatable mounted on a slide (8) in a given arc of rotation about its axis perpendicular to the slide (8) by a lever (12). The die (1) has an elongated piece retaining element (3, 4) at each of two ends of its partial circumferential groove (2). The first or the second counter-die is selectable to co-operate with the die in bending the elongated piece depending on the required curvature to right hand or left hand.

Abstract: A bending device for a tubular member includes a bending tool which is rotatable about an axis. The bending tool includes a circumferential recess and is split transversely to the axis to form a first tool member and a second tool member. Extending tangentially to the recess and partly embracing the tubular member is a plate-shaped wiper die which has a receiving channel. A non-rotatable disc-shaped support tab is securely fixed to the wiper die and projects between the first and second tool members. The support tab has a circumferential cradle which is configured to match a contour of the tubular member and to merge into the receiving channel of the wiper die in a tangential and smooth manner. An outer clamping jaw is jointly pivotable with the bending tool, and a trough-shaped resistance member is placed in opposition to the wiper die and movable longitudinally along the receiving channel.

Abstract: The invention relates to a machine for bending a profile in two bending directions, that comprises a bending tool including at least two clamping forms (19) centred on the profile bending axis and having the shape of disks having planar junction surfaces (19a) extending in planes perpendicular to said bending axis, in which are formed two rectilinear grooves (20b, 21b) and a peripheral rebate (22b) extending between said grooves and profiled as a continuation thereof, the grooves and the rebate being adapted so that, in the joined position of the junction surfaces (19a) of two clamping foams, the joined grooves define two clamping ducts of a profile and the joined rebates define a profile-winding bearing surface extending between said clamping ducts.

Abstract: The invention relates to a bending head, for example, for a rotary draw bending technique, of the type including a bend form clamp assembly set in rotation about an axis and at least one roller keeping a tube or a profiled section clamped against the bend form during bending. The single assembly can be positioned in one or other of two bending starting positions that are symmetric with respect to the axis of the tube so as to allow either bending in one direction of bending starting from, or bending in an opposite direction starting from (P2). The rectilinear movement of the clamp in two directions (ox) and (oy) and its optimal orientation relative to the roller are obtained using a system involving an eccentric.

Abstract: A tube bender comprising a mandrel, a forming member connected to the mandrel for coaction with the mandrel to effectuate bending of a tube wherein the forming member has at least two bending positions defined thereon, a handle pivotally connected to said forming member, and a release member movable relative to said handle and configured to be secured in a locked position relative to said forming member when said handle is selectively moved to any of one said at least two bending positions thereby preventing relative movement between said handle and said forming member. The release member enables an operator to move the release member to an unlocked position to permit such operator to move the handle relative to the forming member between the at least two bending positions.

Abstract: A bending device for bending machine comprises a matrix (2), a countermatrix (6), and a die (7) able to prevent wrinkles. A countermatrix-holder support element (8) is fixed on an upper slide (10), which is slidable transversally to a workpiece T to be bent on a lower slide (11) movable in turn in the same direction of the upper slide (10), on a table (12). A first double-acting cylinder (19), being fixed on said lower slide (11), moves the countermatrix (6) toward and away from the workpiece (T); and a second double-acting cylinder (24) is slidable on the upper slide (10) and connected to a slider (25) on a counteracting rod (26) which is pivoted about an end of an arm-turning spindle (3), so that a force is exerted on the countermatrix-holder support element (8) in a projecting portion (23) thereof.

Abstract: A bending apparatus for rod-shaped and tubular workpieces, includes a rotatable bending mandrel with a bending groove is provided with a wrinkle smoothener, which immediately precedes the bending mandrel, and two sliding jaws. In order to change the bending direction around the bending mandrel, the sliding jaws can be moved to the other side thereof. In doing so, the sliding jaw on the side of the bending mandrel is arranged freely rotatable on a support axis, which extends parallel to the axis of rotation of the bending mandrel and whose position relative to the bending mandrel can be shifted parallel to the feeding direction of the workpiece. The sliding jaw is provided such that the end of its forming groove facing towards the bending mandrel can be placed in contact with the bending groove by shifting the support axis and, thus, its forming groove tangentially joins said groove.

Abstract: A bending machine according to the present invention include: a first fixture member 22 for holding one end portion of a long work 20; a second fixture member 24 for holding the other end portion of the work 20; a rack 30 mounted on the first fixture member 22 so as to extend in longitudinal directions of the first fixture member 22; a roll-shaped bending die 21, mounted on the second fixture member 24, for bending the work along the outer peripheral surface of the second fixture member; a pinion gear 26 which is coaxially connected to the bending die 21 via a shaft 28 and which engages the rack 30; and a connecting member 27 for connecting the first fixture member 22 to the second fixture member 24 via the shaft 28 in a relatively rotatable state so that the pinion gear 26 is movable along the rack 30 while engaging the rack 30.

Abstract: A clamping assembly for use with a bend arm of a tube bending machine. The assembly comprises a force multiplier linkage that applies a controlled and variable force to a workpiece. In one embodiment, the force multiplier linkage comprises a bearing member pivoted by an actuator acting on one end of a force multiplier arm that is attached to the bearing member. A pivot member supporting a drive link is fixedly attached to the bearing member at a location offset from the bearing member's pivot axis. The drive link pivots about the pivot member axis so that in cooperation with additional links it moves a bend arm slider. The drive link also pivots about the bearing member axis. As the bearing member is pivoted about its axis by the force multiplier arm, the drive link also pivots about the bearing member's axis providing the required force for application to the workpiece.

Abstract: A vise for clamping an elongated workpiece to be bent on a die (2) of a bending machine includes a movable jaw (35), provided with a clamping portion (51) approachable to and removable from the circumferential groove (4) of the die (2). The movable jaw (35) has a pivoting end (7) and a retaining end (8) opposite to the pivoting end (7). The pivoting end (7) is rigidly connected to a spindle (9) rotatable about an axis (X) at right-angles to the rotation axis (Y) of the die (2), so that the clamping portion (51) of the movable jaw (35) is displaced by an operating device (90) from an opened position, far from the elongated workpiece to be bent, to a closed position in which the clamping portion (51) mates with the elongated workpiece. A retaining device (28) is able to grip the retaining end (8) of the movable jaw (35) and to maintain the movable jaw (35) in its closed position.

Abstract: A bending assembly on a bending machine for the bending of rod and/or bar-shaped workpieces (8) includes a bending tool (10) and a bending drive unit (11) with a swivel arm (21) and a bending-drive motor (22). The bending tool (10) has at least one workpiece thrust block (12, 13), and the swivel arm (21) has at least one thrust pad (17, 18). The bending-drive motor (22) rotates the swivel arm (21) with the thrust pad (17, 18) around a bending axis (14) that extends in the transverse direction of the workpiece. The workpiece is bent when the thrust pad (17, 18) forces it against and around the associated workpiece thrust block (12, 13). The shaft of the bending drive motor (22) extends parallel to the bending axis (14), and both ends of the shaft are drive-connected to the swivel arm (21).

Abstract: A feeding mechanism of a pipe bending machine is equipped with several auxiliary hydraulic cylinders in addition to an original power source for providing power to feed a pipe; the auxiliary hydraulic cylinders are joined to an auxiliary fixing member at output rods thereof, which fixing member is displaceable along a toothed locating rod secured on the bending machine, and is equipped with an engaging device capable of releaseably engaging the toothed locating rod to fix the fixing member in position; thus, the feeding mechanism can feed a pipe with increased force output when the fixing member is made unmovable along the locating rod by the engaging device, and when the auxiliary hydraulic cylinders operate.

Abstract: A bending machine according to the present invention include: a first fixture member 22 for holding one end portion of a long work 20; a second fixture member 24 for holding the other end portion of the work 20; a rack 30 mounted on the first fixture member 22 so as to extend in longitudinal directions of the first fixture member 22; a roll-shaped bending die 21, mounted on the second fixture member 24, for bending the work along the outer peripheral surface of the second fixture member; a pinion gear 26 which is coaxially connected to the bending die 21 via a shaft 28 and which engages the rack 30; and a connecting member 27 for connecting the first fixture member 22 to the second fixture member 24 via the shaft 28 in a relatively rotatable state so that the pinion gear 26 is movable along the rack 30 while engaging the rack 30.

Abstract: A tube bender comprising a mandrel, a forming member connected to the mandrel for coaction with the mandrel to effectuate bending of a tube wherein the forming member has at least two bending positions defined thereon, a handle pivotally connected to said forming member, and a release member movable relative to said handle and configured to be secured in a locked position relative to said forming member when said handle is selectively moved to any of one said at least two bending positions thereby preventing relative movement between said handle and said forming member. The release member enables an operator to move the release member to an unlocked position to permit such operator to move the handle relative to the forming member between the at least two bending positions.

Abstract: A bend die assembly includes a bend die and a clamp block assembly. The bend die is reversible and includes a T-shaped projection which extends outward from the bend die. The clamp block assembly includes a first clamp block and a mating second clamp block. The first clamp block includes a first T-shaped opening sized to slidably receive the bend die T-shaped projection. Each clamp block includes a tube groove which includes a plurality of indentations corresponding to a desired compound bend to be formed in tubing.

Abstract: A quick change tooling method and apparatus has been devised for tube bending operations in which the bend die, clamp die and pressure die as well as mandrel and wiper die, if required, are preassembled along with a tube corresponding to the tube to be bent in that particular die assembly by releasable latches or other types of releasable connectors; and each preassembled die set as described can be removed, transported and relocated on a bending machine as a complete assembly and in exact aligned operating position without readjustment and pressure setting each time that the die set is installed. A lift mechanism is provided to facilitate lifting of each die set onto and from the bending machine as well as to automatically locate each die set in proper aligned position on the machine.

Abstract: A bending apparatus has a die, a first clamp for clamping an elongate work piece into engagement with the die forward of the transverse center line of the die on one side of the die and a second clamp for clamping the elongate work piece into engagement with the die forward of the transverse center line of the die on the other side of the die. The first and second clamps are rotatable around the axis of the die to bend the elongate work piece. The first and second clamps are each movable between a retracted position in which the clamp is separated laterally from the die and is located below the plane in which the work piece is to be bent and an engaged position in which the clamp is in clamping engagement with the die.

Abstract: A clamp die apparatus for co-operating with the bend die of a tube bending apparatus during tube bending has a support bolster adapted for adjustable mounting on a bend arm of a tube bending machine and a primary clamp die rigidly mounted on the support bolster for clamping a portion of a tube against a bend die of the bend arm. A secondary clamp die is movably mounted on the support bolster for movement between an extended position alongside the primary clamp die and a retracted position spaced rearwardly from the primary clamp die. Each clamp die has a clamping surface for bearing against a portion of a tube to be bent, and the clamping surfaces of the primary and secondary clamp dies are aligned to form a clamping surface of extended length when the secondary clamp die is in the extended position. The primary clamp die alone forms a reduced length clamping surface when the secondary clamp die is in the retracted position.

Abstract: A resin-coated ribbed steel pipe that is provided with an axially extending rib that is made from the same material as the coating and forms a hold groove is fed forward and bent along with the rotation of a shaping roller that is provided with an accommodating groove having a shape identical to the half of the cross section of the pipe that includes such rib and also has a protruding wheel that inserts itself into the hold groove as the pipe is fed forward, the reaction force created thereby being managed by a device that, possessing a shape identical to the other half of the cross section of the pipe, suppresses the reaction force and yet allows the feeding of the pipe.

Abstract: A multi-row pipe bending apparatus has a plurality of rows of pipe bending devices each including a pipe bending unit having at least one bending die, and clamping and pressure dies for securing to the bending die a pipe to be bent. Each bending device includes also a pipe twisting unit having a twisting plate having an opening for holding the pipe, and rotatable with a predetermined twisting angle about the longitudinal axis of the pipe for moving it to a position conforming to the shape into which it is to be bent. The bending and twisting units are movable longitudinally of the pipe. A pipe transfer device is provided for transferring the pipe from one row to another, so that the pipe may be bent close to one end thereof in one row, and close to the other end in another.

Abstract: Improved counterdie for pipe bending machines, that has an approximately semicylindrical configuration in the working zone, with its frontal walls in a progressive ramp that becomes more pronounced in the vicinity of the exit zone, and provided with a longitudinal neck that is semicylindrical after the entrance zone, and then later truncated cone-shaped up to the exit zone, and with a longitudinal depression at the bottom with progressive section.

Abstract: Vise for clamping a pipe or rod or section bar or other mechanical part, with a jaw (3) and a counterjaw (3'), comprising a piston fixed in position by a support (10) with a rod (6) to the head of which said counterjaw (3') is rendered integral through a cart (7); pliers with two catches (9, 9') hinged upon said support (10) to rotate vertically and endowed with hooks (9a, 9a') fit for engaging two corresponding cavities (3a, 3a') provided on respectively upper and lower surfaces of said jaw, said catches having their profile with an inner and outer raising (12, 12a; 12', 12a') toward the exterior of the working field of the pliers themselves, said cart having two pegs (13, 13') respectively fit for engage each one of said outer raisings to cause the closing of the catches with the advancement of the cart by contrast against the outer raisings themselves, and pipe bending machine or rod or section bar bending machine that comprises it, with the jaw being integral with the matrix, as well as comprising a dragg

Abstract: The pipe bending machine comprises a rotatable bending template (14) and a pivot arm (21) pivotable about the axis of the bending template and supporting a clamping jaw (22). In order to be able to perform rightward bending as well as leftward bendings of a pipe (27), the bending template (14) consists of two template parts (15,16) configured for different bending directions. The clamping jaw (22) also consists of jaw parts (23,24) for different bending directions. On both sides of the bending head, slide rails (32,33) are arranged.

Abstract: A shaped groove countermatrix for a rotary groove pulley matrix and countermatrix head pipe bending machines has a semicircular cross-sectional tract and an end tract (2) tapered, both longitudinally and transversely according to substantially elliptic profiles (20). With respect to the preceding tract, an edge of a groove (10) remains at the same level. The end tract (2) has its cross section substantially determined by the arcs (4, 4') of two ellipses (12) with their major axes (6, 6') parallel to and slightly offset with respect to a plane of longitudinal symmetry (8) of the groove (10) which is inferiorly radiused by an arc which is elliptic too. The tapering of the end tract (2), starting from a substantially parabolic profile (14), has its axis on the plane of longitudinal symmetry (8) of the groove (10) and its convexity (16) at a short distance from the exit edge (18) of the groove (10).

Abstract: A shaped groove countermatrix for a rotary groove pulley matrix and a countermatrix head pipe bending machine has a semicircular cross-sectional tract and an end tract (2) tapered, both longitudinally and transversely, according to substantially elliptic profiles (20). The end tract (2) has its cross section substantially determined by the arcs (4, 4') of two ellipses (12) with their major axes (6, 6') parallel to and slightly offset with respect to a plane (8) of longitudinal symmetry of the groove (10). The tapering of the end tract (2) starts from a substantially parabolic profile (14) which has its axis on the plane (8) of longitudinal symmetry of the groove (10) and its vertex (16) at a short distance from the exit edge (18) of the groove (10). A well (22) allows for feeding a lubricating fluid onto the groove (10) which is in fluid communication therewith through a hole (24) via a wick (24'). A check valve ( 26) allows recharge of the well (22) with the lubricating fluid.

Abstract: Method and apparatus for bending serpentine heat exchanger tubes using a split bend die having a relatively short upper die section with a straight back end. After the tube is bent in conventional manner using a clamp die and a pressure die, the bend die is split along a shaft and rotated through a predetermined angle to position the straight back end substantially parallel to a straight segment of the tube at the output of the bend die. The input segment of the tube is then moved next to the shaft in preparation for rotating above the input segment to raise the output segment above the upper section of the bend die. Such lateral motion reduces the segment spacing required for clearance of the upper section. Other features for reducing the spacing are providing an indentation on the shaft, angling the back end with respect to the sides to provide a minimum length, and truncation an upper portion along the back end.

Abstract: A rotary die pipe bending apparatus comprising a bend die mounted for rotation about a bending axis and a clamp die for clamping a pipe to the bend die. The clamp die holds the pipe to be bent as the bend die and the clamp die rotate about the bending axis. A pressure die directed against an outer surface of the pipe for restraining a portion of the pipe spaced away from the bend to be formed in the pipe. A reverse die engaged with an inner surface of the pipe at a location spaced away from the clamp and bend dies and near the pressure die for resisting the bowing of the pipe in back of the bend die and for avoiding the formation of an indentation at the end of the bend.

Abstract: Method and apparatus for bending metal tubes such as for furnace heat exchangers. After the bend die is rotated 180.degree. to make a bend, an upper section of the bend die is split from a lower section, and the upper section is then rotated approximately 90.degree.. In such manner, a portion of the upper section is displaced laterally to vacate a region directly above the lower section. Therefore, in moving the tube forwardly to a new location for a subsequent bend operation, a portion of a previous bend passes through the vacated region thereby enabling sequential bend angles that are less restricted than without rotating the upper section of the split die.

Abstract: Briefly, and in accordance with the foregoing, the present invention comprises a roller assembly for use with a bending apparatus for bending conduit and the like. The bending apparatus includes a frame, a bending shoe associated with the frame and a drive device for controllably driving the bending shoe. The roller assembly provides a roller which pivotably adjusts to an outside surface of the workpiece to accommodate variations in the workpiece while it is being bent during a rolling operation. The roller assembly includes a shaft attached and supported by the frame, two pivot segments and two roller dies. The pivot segments are positioned along and spaced apart on the shaft and each has an arcuate surface in a facing orientation with the other pivot segment. The roller dies have facing ends and base ends and a pivot socket formed in the base end. The pivot socket is sized and dimensioned for cooperatively mating with the arcuate surface of the pivot segment.

Abstract: A bending die for forming a 180.degree. bend in a tube includes a center die and a shiftable block pivotally mounted to the center die grooves are defined on opposing sides of the center die and shiftable block for supporting the tube while being bent. The grooves have a C-shaped cross section for receiving and holding the tube during the bending process, but which grooves create an interference condition trapping the bent tube in a plane defined by the grooves. The shiftable block is pivotally connected to the center die and movable between a bend-forming position where the shiftable block forms an upper part of the groove along the one opposing side and part of the end, and a tube-release position where the shiftable block is removed from the one opposing side. The bending die also includes a clamp die that both clamps the tube to the center die and also holds the shiftable block to the center die while the tube is being bent, but which is movable to release the shiftable block.

Abstract: A bending machine comprising a feed mechanism and a bending assembly mounted on a base block for bending an elongate workpiece such as a pipe or the like. The feed mechanism includes a member for holding a rear portion of the workpiece, and the bending assembly includes a plurality of dies for bending a forward portion of the workpiece. The disclosed bending machine further comprises a first actuator provided between the bending assembly and the base block for moving the bending assembly on a bending plane, and a second actuator between the feed mechanism and the base block for moving the feed mechanism along a rotational axis of the dies.

Abstract: A bending die and a method of using the die to bend a pipe or the tube closely adjacent to an end of the tube having an end fitting is described. The bending die has a bending die member with a generally circumferentially extending groove around which the pipe or tube is bent. A clamping die member clamps an end portion of the tube against the bending die member. A clamping jaw member removably attached to the clamping jaw member, has a generally planar clamping face that contacts the end fitting on the pipe or tube. The bending die member defines a notch to accommodate a portion of the end fitting when the tube end is initially clamped to the bending die member. The method of bending the pipe or tube encompasses the steps of cutting the pipe to length, attaching the end fitting to the end of the pipe or tube (such as by welding), inspecting the end fitting-tube joint and subsequently bending the tube.

Abstract: A pipe bending machine having a support, a bending template, a clamping jaw displaceable relative to the bending template, a clamping member for a pipe, and clamping bodies each provided in a respective one of the bending templates and the clamping jaw and movable relative to one another to an operative position, one of the clamping bodies havign a clamping surface which is provided with different contours for portions of a pipe to be clamped, while the other of the clamping bodies being provided with a clamping surface having only one contour corresponding to the portion of the pipe to be clamped so that the portion of the pipe to be clamped is engaged over its whole surface at the respective side over an angular distance of 180.degree..

Abstract: In a tube bending machine including a bending template having a groove receiving a tube portion to be bent and a clamping jaw cooperating with the bending template to bend the tube portion, the template and the clamping jaw each includes a clamping element with interchangeable clamping faces. Each clamping element has a hydraulic drive incorporated in the template and the clamping jaw, respectively.

Abstract: A pipe bending machine comprises a longitudinally extending machine frame having an upper side, a feeding carriage movable at an upper side of the machine frame and carrying device for clamping a pipe, a bending head provided on one end of the machine frame and rotatable about a vertical axis, a bending template mounted on the bending head and formed as a multi-level template having a plurality of bending grooves provided with different bending diameters and arranged at different levels, a device cooperating with the bending template for bending a pipe therebetween, the bending template and the displacing carriage with the clamping sleeve being movable relative to one another in a vertical direction and transversely to a longitudinal direction of the machine frame for using one or another of the bending grooves, the bending template being liftable and lowerable in the vertical direction for exchanging the bending grooves, while the feeding carriage being moved transversely in the longitudinal direction of the

Abstract: Tube bending apparatus in which a tube is clamped between a U-shaped bend die and a cooperating pressure die, the pressure die being advanced in a linear direction as the bend die is rotated, a tube groove in each of the dies embracing diametrically opposite sides of the tube. The tube groove on the bend die is of generally U-shaped configuration having a semi-circular bend section and opposite sides extending in tangential directions to define tangential grooves along opposite sides of the bend die, the cross-sectional radii of curvature of the tube groove along the bend section and tangential sections are closely controlled to impart some temporary distortion to the tube which will resist wrinkling or collapse. Similarly, the tube groove on the pressure die has cross-sectional radii of curvature corresponding to those of the bend section of the bend die in order to cooperate with the bend die.

Abstract: A bending apparatus is provided for rectangular tubes. The apparatus comprises a bending die, a wiper die, a clamp die, a pressure die and a mandrel. The clamp die and pressure die are provided with tongues which are engageable in corresponding grooves in the bending and wiper dies. The tongues and the clamping and pressure surfaces of the respective dies are dimensioned to enable the rectangular tube to be bent about either of its two axes by placing the tube on either of the opposed sides of the respective tongues. The tongue of the pressure die is movable to facilitate the tangential advancement of the pressure die under the action of a booster for urging the tubing into the bend. The mandrel includes a plurality of movable blocks. A plurality of springs interconnect the blocks to facilitate alignment. The blocks are mounted to a replaceable head which can be removed and replaced when worn. The mandrel includes channels for lubrication.

Abstract: A tube bender has two readily connectable and detachable members. A base member has a block with two parallel grooves. The tube groove is formed in an arc having the radius of the desired bend and a cross-section with a radius corresponding to the tube diameter. The second groove has straight sides and an arc similar to the tube groove. Pivotally mounted on the base member adjacent the block is a retainer. In its first position a radius therein clamps the tube in the tube groove. In its second position, a fork fits over the conventional ferrule of a connector fitting. The block is notched opposite the retainer to receive the outer end of the fork and a connector nut. The forming member has a crescent-shaped end of a radius complementary to the second groove so that the crescent may fit snugly in the second groove. A forming block on the forming member engages the outside of the tube and causes it to conform to the shape of the groove. For manual operation, the two members have diverging handles.

Abstract: A tube bending machine comprises a bending table carrying a bending template and a clamping jaw for receiving a tube to be bent therebetween. The template and the clamping jaw are each formed with a recess to receive various clamping members. Each clamping member is movable into and away from the recess in the template or the clamping jaw so that different clamping members having different clamping surfaces are positioned against each other to clamp a tube being bent.

Abstract: Disclosed is a pipe bending machine which for the purpose of increasing the freedom of bending operation, is provided with a stand which supports longitudinally extending flat supporting beam of a relatively low height. The forwardly projecting part of the supporting beam has a lateral extension supporting for rotation the bending table whose center axis of rotation is laterally offset relative to the side wall of the supporting beam. The bending table has a rotation symmetrical configuration and consists of an inner rotary sleeve which acts simultaneously as a cylinder for lifting a two piece bending die. The drive for the bending table, and the drives for sliding shoe cooperating with the bending die are arranged on the projecting part of the supporting beam in a single structural unit.

Abstract: A portable electric driven conduit bender which accommodates rigid, IMC and thinwall conduit of various sizes in a single setup includes a rotatable, cone-shaped bending shoe, and a roller assembly for supporting conduit during bending. The bending shoe has a pair of arcuate-shaped die portions positioned diametrically opposite one another for shaping rigid and IMC conduit, and thinwall conduit, respectively, and each die portion has a plurality of bending grooves formed therein for accommodating various conduit diameter sizes. The roller assembly includes a roller unit for larger diameter conduit that has a split forming roller and a solid backup roller located side-by-side which cradle the conduit during the bending operation. One of the halves of the split roller is adjustable in its axial direction between a closed position for supporting thinwall conduit and a separated position for supporting rigid conduit.

Abstract: There is disclosed a pipe bending machine comprising a movable clamping unit for holding a pipe to be bent and feeding the pipe along a feed path. A slidable guide rail extends in the longitudinal direction of the feed path to guide the pipe. Bending of the pipe is carried out at a pivotable bending table, which carries a template provided, at two opposite sides thereof and in a single plane, with two curved bending surfaces of different radii. Clamping devices are present for clamping the pipe to either one of the surfaces. A displacing device is provided to displace the template in a horizontal plane and relative to the guide rail to compensate for any eccentricity of the center of curvature of either or each of the surfaces with respect to the pivot axis.

Abstract: A rotary draw bending machine employs a stack of bending dies 22 of different curvatures, forming part of a bend head 18 that is entirely mounted on the forward end of the machine bed 10 for bi-directional lateral and vertical motion so that without changing the position of the centerline of the pipe 16 to be bent, it may be formed by bend dies of different curvature. The entire bend head 18 is shiftable laterally to enable the bend dies to clear the pipe 16 as the dies move vertically to position another die. A single pressure die 20, which is mounted on the movable bend head 18, is mounted for vertical movement relative to the bend head so that it can be positioned in alignment with the pipe.

Abstract: The bending assembly for one or more tubes at a time comprises a matrix or ie with substantially smooth cylindrical skirt and a sliding block provided with a groove for receiving the tubes to be bent and angularly rotatable relative to the matrix or die. The matrix or die and sliding block, along with a bearing shoulder for the tube to be bent, are retractable in a direction at right angles to the bending plane. In addition to the bending assembly, the apparatus comprises clamping devices and also structure for automatic centering of the tube and taking up of the tolerance on the legs or between different bendings. These last mentioned devices are arranged in line in a same structure, the bending and clamping devices being mounted on slides.

Abstract: A pipe-bending machine has a bending table rotatable about an axis of rotation, a bending form having two opposite curved sections each defining a center of curvature, an oblong hole connecting the two centers of curvature, a retaining bolt coaxial with the axis of rotation of the table and projecting above the upper surface of the latter to engage the oblong hole, and means for shifting the bending form from one working position in which one center of curvature coincides with the axis of rotation of the table into another working position in which the other center of curvature coincides with the axis of rotation, and means for arresting the bending form in its selected working position.

Abstract: A generally circular die is mounted on a rotatable shaft in non-rotatable relation thereto. The periphery of the die is formed by a plurality of separate arcuate (circular) portions curved along a path equal in radius to the desired radius of curvature of the bend in the different size pipes being bent. Each of the arcuate portions includes a hemispherical recess having a diameter differing from the others and substantially equal to the outer diameter of the tube being bent in that particular arcuate portion. A force transmitting member is secured by an arm to the aforementioned vertical shaft and is rotatable therewith. The surface of the force transmitting member is provided with a plurality of separate arcuate portions, each having a hemispherical recess therein corresponding to those on the corresponding portion on the die face opposite.