Abstract: The high force rebar bending machine comprises a frame which carries a bending die. An arm is pivoted to swing around the bending die with a bending roller thereon. Rebar engaged by the bending roller is bent around the die as the arm swings. A fluid cylinder has its piston connected to a cable. The cable is wrapped around a large drive wheel which, in turn, is connected to the arm so that bending force is multiplied. The entire structure is sufficiently compact and light to be portable for use at a job site.

Abstract: In a pipe bending apparatus, a chuck unit is movable along a straight pipe for holding it in position between a pair of bending units which are also movable along the pipe. The apparatus can bend even a long metal pipe having a small diameter accurately at a desired angle in any of a variety of directions, while allowing it to be quickly set for any bending job.

Abstract: An apparatus for straightening arrowheads is designed to be used to straighten bent arrowheads so that the arrowheads, once straightened, may later be used in archery activities. To straighten a bent arrowhead, one removes or retracts any blades of the arrowhead (if possible) and attaches the arrowhead to a rotatable shaft. The rotatable shaft is free to rotate through the shaft aperture in the shaft housing, and the shaft housing is attached to the base of the device. To straighten the arrowhead, one applies pressure to the high side of the tip end of the arrowhead and, if desired, rotates the rotatable shaft so that the pressure is evenly applied to the high side of the tip end. The apparatus employs a pressure screw and a pressure band to effectively apply pressure to the arrowhead.

Abstract: A method and apparatus for bending a heat-exchanger tube, which heat-exchanger tube have heat-exchanger ribs preferably having a needle construction. In the method and apparatus, the heat-exchanger tubes are placed one above the other to be defined by one another to form a battery. The battery of heat-exchanger tubes is fed first into a first bending-device portion of the bending device in which the heat-exchanger tube is bent in one direction. After this, the tube battery is fed further, and the bending is performed in the second bending-device portion in the opposite direction of bending, whereby a wave-shaped form is obtained.

Abstract: A method of manufacture of a hollow stabilizer for automobiles which uses a heat-finished seamless steel pipe 20 as a material, comprising an inner surface and/or an outer surface of a part corresponding to a bending R portion A-B of the steel pipe 20 is polished to remove defects of the surface of the steel pipe, and after the above surface roughness is made less than Rmax 50 .mu.m, the part corresponding to the above bending R portion is previously formed an ellipse in section, and then the section after bending process accesses to a true circle to alleviate stress concentration of the bending part.

Abstract: A machine for processing wire lattice mats made of welded-together longitudinal and cross wires, with a device for bending back cross wire end pieces extending beyond the longitudinal edge wires of the lattice mat to form loops, the bending device (U) having a bending template (14) which is displaceable in the a guide block (11) and a bending tool (10) eccentrically disposed on a bending plate (8) and pivotable around the bending template, the guide block located opposite the bending plate constituting a support surface (12) for the wire to be bent, and where the bending tool can be moved back and forth between a work position for a wire to be bent and a rest position, in which a penetration gap for a wire to be bent is formed between the support surface of the guide block and the bending tool.

Abstract: A bending device for forming a blanking tool of a die cutter used for cutting folding carton blanks. The bending device includes a support member defining a planar work surface, an axle member defining a longitudinal axis of rotation and orientated for rotation about said axis in a plane passing through said axis and perpendicular to said work surface, locator pins on said support member defining a plurality of bending stations and cooperable with said axle member to position said axle member at one of said bending stations during a bending operation; mounting arms for mounting said axle member on said support member to permit movement of said axle member to any one of said bending stations; and a roller mounted eccentrically at the lower end of said axle member and defining a bending axis parallel to and spaced from said rotational axis. When the axle member is positioned at a bending station and rotated a workpiece located between the roller and locator pin is bent to a desired angle.

Abstract: A hand brake for deforming a metal work piece, which includes a mechanism for clamping the work piece into a fixed position, such as a gripping mechanism or clamp, and a mechanism connected to the clamp for bending at least a portion of the work piece. The bending mechanism includes a bending member and a mechanism for rotating the bending member about its longitudinal axis to make contact with the work piece and angularly displace at least a portion of the work piece. The bending member is pivotally connected to the clamping mechanism and is disposable beneath at least a portion of the work piece.

Abstract: A bending apparatus for metal pipe and tubing which includes an upright spindle assembly; a lower section mounted on the spindle assembly for rotational movement around the spindle, the lower section can be selectively moved around and engaged with the spindle assembly; an upper section which is rotatably mounted on the spindle assembly and removably connected to the lower section, the upper section includes a removable shoe bender; and a radius die positioned at the top of the spindle assembly and in pipe or tube engaging alignment with the shoe bender. The bending apparatus can be disassembled, and moved to a different work site, and reassembled by one person. The bending apparatus can bend pipe or tubing of one-half inch to two inch diameter and larger.

Abstract: A transport mechanism (28) is disclosed for use in a pipe bender (10) for bending pipe sections (12), particularly pipe sections having a diameter greater than one foot. First and second powered rollers (30, 32) are mounted within the pipe bender and driven by hydraulic motors to move the pipe section in a controlled manner through the pipe bender. A hold down roller (34) is pivoted against the pipe section to force the pipe section into engagement with the powered rollers to insure an adequately frictional engagement between the rollers and the pipe section to move the pipe section through the pipe bender.

Abstract: This invention has concentrated on the construction of an extra bending mechanism which by appearing at the right moment, creates wire/rod bends always in relation with the above mentioned line x--x, but within other planes E2, also containing line x--x 15 but distinctly different than plane E1. In this manner it is possible to achieve the construction of wire shapes in three dimensions.

Abstract: A small-diameter metallic conduit bending machine includes a stationary frame. The stationary frame made of bar stock or pipe stock is shaped so as to substantially conform to a finished metallic conduit. The stationary frame includes a bending section which has in its lengthwise direction a curvature smaller than the bend radius of the metallic conduit and in its widthwise direction a guide surface substantially orthogonal to the bend plane of the metallic conduit. A bending member whose outer peripheral surface faces the guide surface is disposed movably toward the stationary frame so that the metallic conduit can be bent so as to lie along the guide surface. The bending member is moved by an actuator when the actuator is in its pulling stroke.

Abstract: An apparatus for processing wire or rods includes a plurality of driven fixed rollers for feeding the wire or rod through the apparatus, each fixed roller having an axis of rotation normal to the central access of the wire rod. A plurality of adjustable rollers is provided for engaging the wire rod and imparting a plastic deformation thereto. Each adjustable roller has an axis of rotation and the adjustable rollers are offset from the fixed rollers. A device is provided for moving the adjustable rollers from a position out of engagement with the wire rod to a position engaging the wire rod. A device is also provided for independently adjusting the adjustable rollers so that the planes defined by the axis of rotation of the adjustable rollers are set at an adjustable angle to the central axis of the wire rod so that a desired torsion can be applied to the wire rod. A wire bending device is also provided for bending the wire or rod, and a cutter is provided for cutting the wire or rod.

Abstract: Method and machine to bend the trailing end of bars, which is to be carried out automatically or otherwise in bending-shaping machines with a working platform (22) that can be positioned as desired in relation to the horizontal and with a bending assembly located downstream of a feeding-straightening assembly for bars unwound from a reel, whereby after the required bends have been made in the leading end (T) of the bar (29), the bar (29) is fed forwards by an appreciable length at least partially by the feeding assembly with a movement of distancing of the leading end (T) and, this length of feed having been completed, the bar (29) is sheared by a shears (24) so as to create a trailing end (C) of the residual bar (129) when the trailing end (C) has been defined, the residual bar (129) is moved axially by an auxiliary drawing unit (10) located downstream of a bending assembly (35) and suitable to take up a first working position and a second retracted position to free a working platform.

Abstract: Rocker bending unit (10) of a type retractable below a working platform (22) of a bending-shaping machine for bars (29), the unit (10) comprising a bending disk (11) provided with a clockwise and anticlockwise rotation of a bending pin (13) positioned out-of-alignment in relation to the axis of rotation, a contrast roller or pin (12) which may be interchangeable being included and coaxial with the axis of rotation, in which unit (10) the bending disk (11) cooperates with and is supported on a base (18) pivoted so as to be able to rock with a rocker pivot (21) on a frame (28) of the machine downstream of the bending unit (10), the rocking direction lying on a plane substantially at a right angle to the working platform (22) and to the axis of feed of the bars (29), the axis of the rocker pivot (21) being substantially parallel to the working platform (22) and in the geometric neighborhood thereof, the unit (10) being fitted on a slider (27) supported by the base (18) and able to move thereon (18) in a directio

Abstract: The present invention provides a device for bending thin metallic pipes suitably used as a fuel supply pipe, brake pipe and the like of an automobile, which are bent at a plurality of portions thereof not in the same direction but in three-dimensional directions. The device according to the invention includes a stationary mold form having a first and a second bending section to the shapes of which a metallic pipe is bent and a guide member erected upright on the mold form at the second bending section, a bending member arranged outside the mold form and movable toward the latter for bending the metallic pipe, a rotor for rotating the bending member and an actuator for operating the rotor through a wire.

Abstract: A small-diameter metallic conduit bending machine comprises a stationary frame with a guide surface, a bending member for pressing a metallic conduit against the stationary frame, and an actuator for moving the bending member via a lever. One end of the lever supporting the bending member is pivoted to the stationary frame at a position lying substantially on the axial center line of the metallic conduit within a central portion of a bend section where the metallic conduit is bent so as to lie along the guide surface of the stationary frame. Thus, the metallic conduit can be readily inserted between the guide surface and the bending member, and two successive bending works can be completed through one action.

Abstract: A small-diameter metallic conduit bending machine includes a stationary frame which is shaped so as to substantially conform to a finished metallic conduit. A bending member is provided movably toward the stationary frame from thereoutside to bend a metallic conduit. To prevent the bending member from interfering with the metallic conduit which is moving as the result of the bending process of a preceding stage, an actuator is provided to remove the bending member from the moving area of the metallic conduit. That is, the binding member is made movable toward the stationary frame and retractable from the moving area of the metallic conduit.

Abstract: A small-diameter metallic conduit bending machine comprises a stationary frame segment and a movable or separated frame segment, each including a bending station. Where a metallic conduit seems to interfere with the movable frame segment kept in its normal position when the metallic conduit is bent by a bending member, the movable frame segment is displaced to avoid interference, a subsequent bending work is performed beforehand, and then the subject bending work is performed after the movable frame segment is returned to its normal position.

Abstract: A machine for bending tubular or rod stock into complex, compound shapes has three driven synchronized rollers together with a single shaping roller also synchronously driven. The shaping roller is mounted on an arm pivotally mounted about the shaft of the downstream one of the three rollers and its movements are precisely controlled and effected by a single hydraulic cylinder. The control valve for the valve is entirely operated by a signal supplied from a omputer which has been pre-programmed to effect the formation of the particular shape or shapes desired.

Abstract: A bending machine comprises a support to which first and second spaced cooperating bending devices are displaceably mounted. Each of the bending devices have first and second spaced cooperating bending components and the components of the first and second bending devices define a first axis extending between the bending devices and further define second and third axes extending generally transverse to the first axis and about which a length to be bent may pivot and each of the second and third axes are disposed between the components of one of the bending devices. A drive mechanism is operably associated with at least one of the components of each of the bending devices for causing displacement thereof. A guide system is operably associated with the support and with each of the bending devices so that displacement of the bending components by the drive system causes the bending components to move relative to the first axis and to engage the length to be bent extending between the devices.

Abstract: A portable tool for bending elongated mine roof bolts in situ including a stationary support portion for holding a part of a roof bolt, a movable support portion for holding another part of the roof bolt, a power cylinder and piston for moving the movable support portion in an arc to effect bending one end of the bolt, to permit insertion thereof into a mine roof opening. The power cylinder and piston being activated to return the movable support portion to its initial position, thereby straightening the bolt to permit full insertion of the bolt into the mine roof opening.

Abstract: A tube bender having a swivel connection of the handle to the shoe for facilitating readjustment of the handle in providing tube bends of greater than 90.degree., while avoiding crossover of the tube handle with the mandrel handle. The shoe handle includes a cylindrical extension rotatably received in a socket in the shoe and structure is provided for automatically disposing the handle in either of preselected dispositions. The extension is caused to be disposed in an overcenter arrangement in the preselected dispositions so as to cause forces generated on the shoe handle during the bending operation to more firmly lock the handle in the preselected disposition. A friction washer is provided for biasing the shoe handle to provide releasable retention thereof in the preselected positions.

Abstract: A bending machine comprises a support to which first and second spaced cooperating bending devices are displaceably mounted. Each of the bending devices comprises first and second spaced cooperating bending components and the components of the first and second bending devices define a first axis extending between the bending devices and further define second and third axes extending generally transverse to the first axis and about which a length to be bent may pivot and each of the second and third axes are disposed between the components of one of the bending devices. A drive mechanism is operably associated with at least one of the components of each of the bending devices for causing displacement thereof. A guide system is operably associated with the support and with each of the bending devices so that displacement of the bending components by the drive system causes the bending components to move relative to the first axis and to engage the length to be bent extending between the devices.

Abstract: A bending machine having a rotary bending head to which fluid pressure is transmitted via a fluid flow or fluid pressure transmission device comprising a fixed block and a rotary shaft mounted in relation to the fixed block so as to be rotatable relative thereto. The fixed block has at least one passageway through it extending to the rotary shaft, and the rotary shaft has at least one annular groove in registration with the fixed block passageway and at least one axially extending passageway in communication with the annular groove. As a result, the axial passageway is in communication with the fixed block passageway independently of the angular position of the rotary shaft relative to the fixed block.

Abstract: An automatic tube bending machine, in which, an electric motor is adapted to drive a speed reduction multiple-pulley system which in turn powers a synchronous intermittent feeding device to feed tube pieces piece by piece into a moulding seat from a storage rack, the same pulley system also actuates a flywheel, and this flywheel drives a gear system that then spins a crank shaft having two symmetrical crank arms, which in turn move two face to face arranged splines, then this two splines drive their respective gears engaged therewith, and these gears in turn actuate two L-shaped outward bending moulds to rotate; at the other end of the same crank shaft, it is provided with a bevel gear; engaged with another bevel gear system so to drive another crank shaft, in such a manner, these two crank shafts rotate synchronously in opposite directions; in the meanwhile the latter crank shaft drives a sliding seat, on which is provided with an inward bending mould, located in the opposite side of the two L-shaped opposit

Abstract: A bending device for use in an automatic pipe bender comprises a chuck unit for gripping a straight pipe, a bending unit, and a movable unit. The movable unit can move forward and backward longitudinally of the pipe placed in position. A rotary member is mounted to the movable unit so as to be rotatable within a range of 360.degree. in a direction perpendicular to the axis of the pipe. The bending unit is mounted to the rotary member so that the bending unit rotates with the rotary member.

Abstract: A bending apparatus wherein a long material to be bent is inserted into an axial guide hole of a cylindrical material guide, the bending direction of the long material being determined by a bending direction setting body which is provided rotatably on the outer periphery of the material guide and set in any desired rotational position, and the long material is bent by a bending operation body which is provided in front of the bending direction setting body rotatably around a support shaft set to be perpendicular to the material to be bent and has a material insertion portion formed facing the fore end of the material guide.

Abstract: A system for determining the bend in a section of a pipe which comprises supporting the pipe section on a conventional pipe bending apparatus which consists essentially of a device for holding the pipe section in a relatively horizontal position, for maintaining a first end of the pipe section in a relatively fixed position and for exerting a transverse force against a second and opposite end of the pipe section for creating a bend in the pipe section between the two ends thereof; mounting a first transducer on the first end of the pipe section, the first transducer providing a variable voltage depending upon the angle of the first end of the pipe section relative to the horizontal, mounting a second transducer on the second end of the pipe section, the second transducer providing a variable voltage depending upon the angle of the second end of the pipe section relative to the horizontal, exerting a bending force at the second end of the pipe section to create a bend in the pipe section between the two ends t

Abstract: An extension device for receiving the handle of a wrench so as to assist in the rotation thereof includes a generally flat handle portion, a generally flat offset portion coupled to the handle portion and offset therefrom and first and second stirrups coupled to opposite edges of the offset portion for receiving and positioning the handle of the wrench to be rotated such that the plane of rotation of the handle portion is coplanar with the plane of rotation of the handle of the wrench. Each stirrup includes a V-shaped portion having a first leg coupled to a respective edge of the offset portion and a substantially flat third leg coupled to the second leg of the V and extending over the offset portion. The handle of the wrench is received by the stirrups and positioned by the apex of each of the V-shaped portions. The extension device may also be used as a prybar and a device for bending pipe, metal rod and the like.

Abstract: A hand operated bending tool for forming a clean bend in a venetian blind slat includes a generally U-shaped upward-opening bottom member having a width which exceeds the width of the slat to be bent and having a length proportioned to receive one leg of a slat therein. The bottom member has a low friction curved portion leading into the interior of the member, permitting the slat to roll thereover during the bending operation. An elastomer portion in the bottom member, adjacent the forward end, defines a resilient slat-gripping surface to engage the slat legs and prevent sliding movement of the leg in the channel member during bending. A U-shaped, downwardly-opening top member is received within the bottom member, the top member having a remote end pivotally attached to the bottom member for movement between a raised position to a lowered position in which the upper top member is substantially nested within the bottom member. A slat leg therein is pressed against the gripping surface.

Abstract: In a bending machine, metal strip (42) is bent by a sequence of steps including longitudinal advance of the strip (42) alternating with bending of the strip by a movable tool (18) which engages and deflects the strip when the latter is restrained against longitudinal movement. Provision is made for checking or inspecting the permanent angular deformation of each bend applied to the strip, to take account of the tendency of the metal strip to spring back after bending. Compensation for spring-back is achieved by use of a previously described characteristic relating displacement of the bending tool to the resultant permanent angle of bend applied to the strip. Further compensation is provided to remove an error which can arise if the bending tool is movable along a line of action spaced from the point of bending of the strip by an amount greater than the incremental advance of the strip.

Abstract: A machine for bending elongate material, more particularly tubular members such as brake lines, fuel lines or the like, includes a central clamping device for the elongate material. Bending heads are located on opposite sides of the clamping device, in opposite directions along the axis of the unbent elongate material. Each of the bending heads has a bending die and a counterpressure die that can be swivelled around the axis of the bending die. The bending heads can be moved independently of one another along the axis of the elongate material and can be swivelled around the axis of the elongate material so as to rotate the respective bending planes formed by the respective bending dies and counterpressure dies.

Abstract: A spacer frame for insulating glass has corners in which the radii of curvature of the inner wall and the outer wall each are of a larger radius than the side portions of the hollow shaped bar portion. The spacer frame may be manufactured in an apparatus provided for that purpose, having two displaceable bending heads, by first simultaneously bending a hollow shaped bar portion twice through 90.degree., and then further bending it twice through 90.degree. between the corners, wherein, before the operation of bending the corners, the inner wall of the hollow shaped bar portion is curved inwardly and two notches are produced in the outer wall.

Abstract: The follow bar of a rocker type conduit bender includes a pair of cam tracks with a series of angular ramp surfaces along their length. The inclination of the ramp surfaces relative to the working surface of the bender shoe is varied inversely with changes in length of the bender lever arm to provide more uniform bending forces on the conduit.

Abstract: The invention relates to a device for producing and removing shaped wire material pieces wherein said device comprises a frame which is supplied with bars, said bars being supplied to measuring, cutting and shaping means mounted on the frame, which latter rests on the ground by way of supporting legs defining a space under the frame to allow the passage of a moving tray on which the pieces are unloaded for removal after shaping.

Abstract: A bending mechanism for wire or strip material is provided, which is intended in particular for bending back towards the edge longitudinal wires the projecting end portions of crosswires of reinforcement grids for reinforced concrete construction. The mechanism comprises a substantially circular-sectioned cylindrical bending form, and a bending-tool eccentrically mounted on a rotatable tool carrier which can be rotated in either direction about the axis of the bending-form. The bending-form is shiftable along said axis between a working position, in which the end faces of said tool carrier and said bending-form are substantially touching, and a rest position in which said two end faces define between them a gap for the passage of a wire which is to be bent, in particular a crosswire of a reinforcement grid.

Abstract: An apparatus is provided for bending a welded wire fabric into a desired shape for use in reinforcing concrete. The apparatus includes an elongated frame and a plurality of anvils mounted on the frame around which the wires of the fabric are to be bent. The frame is divided into right-hand and left-hand sides along its length by a vertical plane passing the anvil axes. A first forming bar is on the right-hand side of the plane along the length of the frame. The first forming bar is mounted to pivot with respect to the anvils about a point on the left-hand side of the plane. A second forming bar is on the left-hand side of the plane along the length of the frame. The second forming bar is mounted to pivot with respect to the anvils about a point on the right-hand side of the plane. Means are provided for pivoting each forming bar to bring it into contact with the wires to be bent and for bending the wires around the anvils.

Abstract: Earth well drilling apparatus including piping in a well, a metal drilling tube within the piping, and a hydraulic jet drilling head secured to the lower end of the tube. A seal is disposed between the piping and the tube. The drilling head is urged downwardly through the piping under hydraulic pressure through a tube bneding assembly laterally extensible from a retracted position substantially within the structure. The hydraulic pressure propels the tube downwardly through the piping and bending assembly to bend the tube and to direct the drilling head laterally toward the formation.

Abstract: The disclosure concerns a smooth continuous steel trough, free of longitudinal weld joints except for a flanged frame attached to its open top for supporting a cover grating. The apparatus for performing these steps comprises a conveyor table for moving and clamping a parallel edged sheet of steel while it is cut, such as by a torch, to predetermined length sides, and angled ends corresponding to the flow pitch for the resulting trough. The resulting isosceles trapezoidal section is then conveyed and aligned under an oscillatable convex mandrel or roller having a longitudinal clamping rib axially along its periphery for clamping the trapezoidal sheet near its center at the bottom of what is to be one of the equal side walls of the resulting trough. The conveyor and/or support for the sheet at the mandrel is vertically adjustable to compensate for different size mandrels and thicknesses of the sheets.

Abstract: In producing compound plates, such as compound glass panes, two individual plates are held in opposed spaced parallel relation with a frame located between them and extending along the edges of the plates so that the frame connects the plates together. In assembling the compound plates, the frame is formed by removing a flat strip from a supply source and conveying it to a bending station. While the strip is moved to the bending station or in the bending station a number of miter cuts are formed spaced apart in the long direction of the strip so that the miter cuts separate the strip into connected subsections. The miter cuts are located to correspond to the intersecting edges of the plates. The strip is bent or folded along lines extending in its long direction into a hollow section. Subsequently, the hollow section is formed into a frame by bending the connected subsections at the miter cuts.

Abstract: A tube bending machine with rotary arms carrying a bending moment roller and a bending fulcrum roller has arm shafts mounted for axial movement. The arms are rotated for the tube bending action, whereby the bend so made in the tube lies in a predetermined non-planar arc. The arm shafts are turned by a pinion engaged by a rack and are moved axially by suitable pins engaged in cam slots with the rack and the cam slots all being moved simultaneously. In order to retain the tube in proper location or position during the trusts of non-planar arc bending there may be included more than one roller.

Abstract: A pipe bending machine (10) is described which incorporates a bending die (14) which supports coated pipe during bending without damaging the coating. In one embodiment, the bending die (14) employs a conventional die (30) with a plurality of longitudinal rods (40, 42, 44) spaced from the inner surface of the die (30) and in pipe confronting relation. When the pipe is urged against the bending die in the machine, the rods precompress the material thereunder for transmitting the bending forces. The rods (40, 42, 44) are spaced a sufficient distance from each other in the transverse direction about the inner surface of the die to permit the material to flow outward therebetween to reduce the stresses in the coating. In a second embodiment, a plurality of transversely extending rings (62, 64 66) are positioned on the inner surface of a conventional die (30) which further act to support bending forces without damage to the coating.

Abstract: Method and apparatus for preparing an edge of a steel plate in a UOE process of making steel pipes, wherein a steel plate edge is positioned between a male die and a female die which have a curvature as desired in the edge, and held substantially horizontally by holding means outside the die, and the female die is moved against the edge and the male die by action of a lever which is pivoted about a fulcrum point which is inward of the plate edge and which has a moving means at the other end of the lever opposite the fulcrum point a predetermined distance from the female die. Advantageously, such method and apparatus enable formation of steel pipes using the UOE method having thicknesses previously difficult to produce without peaking of the produced seams.

Abstract: A tube bender construction for manual operation in bending a tube. The tube bender includes a mandrel defining a bending groove into which the tube is urged by a forming member mounted to the mandrel to swing about a bending axis of the bending groove. The tube to be bent is held against longitudinal movement during the bending operation by a tube holding member. Movement of the forming member about the bending axis is effected by manipulation of a pair of handles. The tube holding member is selectively retained in a retracted position spaced from the tube-retaining disposition by cooperating movement limiting structure on the tube holding member and structure in fixed association with the mandrel.

Abstract: For straightening of bent pipes a device with a base in two parts provided for spanning the bent pipe on one longitudinal side of the bend of the pipe. One base is connected to one end of a tie bar, which is pivotally fastened at the other end to a piston rod in a working cylinder. The working cylinder is pivotally fastened to a corner of a triangular straightener, another corner being pivotally fastened to one part of the other base, and the side opposite this corner bearing a thrust block or roller, which presses against the other longitudinal side of the bend of the pipe.

Abstract: A tube bender construction for manual operation in bending a tube. The tube bender includes a mandrel defining a bending groove into which the tube is urged by a forming member mounted to the mandrel to swing about a bending axis of the bending groove. The tube to be bent is held against longitudinal movement during the bending operation by tube-holding structure arranged to clamp the tube against an extended groove portion of the mandrel. Movement of the forming member about the bending axis is effected by manipulation of a pair of handles which are arranged in offset manner to permit crossover of the handles and avoid interference between the user's hands thereon in the tube bending operation. The mandrel further defines an extension adapted for mounting thereof in a vise or the like. The handle connected to the mandrel is removably connected thereto as for removal when the mandrel is vise-mounted.

Abstract: A tube bender construction wherein the forming member is swingably mounted to the form wheel to be adjustable toward and from the form wheel groove to accommodate variations in tube diameter and normal wear of portions of the tube bender during the life thereof. The form wheel defines a concave force transfer surface having an improved engagement with the tube to be bent so as to effectively improve maintained tube roundness for effectively minimized stress formation in the bent tube.

Abstract: A tube bender construction for manual operation in bending a tube. The tube bender includes a mandrel defining a bending groove into which the tube is urged by a forming member mounted to the mandrel to swing about a bending axis of the bending groove. The tube to be bent is held against longitudinal movement during the bending operation by tube-holding structure arranged to clamp the tube against an extended groove portion of the mandrel. Movement of the forming member about the bending axis is effected by manipulation of a pair of handles which are arranged in offset manner to permit crossover of the handles and avoid interference between the user's hands thereon in the tube bending operation.

Abstract: A tube bender construction for manual operation in bending a tube. The tube bender includes a mandrel defining a bending groove into which the tube is urged by a forming member mounted to the mandrel to swing about a bending axis of the bending groove. The tube to be bent is held against longitudinal movement during the bending operation by tube holding structure arranged to clamp the tube against an extended groove portion of the mandrel. Movement of the forming member about the bending axis is effected by manipulation of a pair of handles. Indicia are provided on the mandrel and forming member for indicating the angular extent of a bend provided in the tube as a result of the swinging movement of the forming member about the bending axis. At least one of the first and second indicia are adjustably mounted to provide accurate correlation between the indicia in indicating the bend angular extent.