US3823749A - Bending machine for wire or strip - Google Patents

Bending machine for wire or strip Download PDF

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Publication number
US3823749A
US3823749A US00322878A US32287873A US3823749A US 3823749 A US3823749 A US 3823749A US 00322878 A US00322878 A US 00322878A US 32287873 A US32287873 A US 32287873A US 3823749 A US3823749 A US 3823749A
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United States
Prior art keywords
path
bending
wire
bending tool
anvil
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Expired - Lifetime
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US00322878A
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English (en)
Inventor
W Boyer
G Ritter
K Ritter
O Gamillscheg
J Ritter
H Gott
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EVG Entwicklungs und Verwertungs GmbH
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EVG Entwicklungs und Verwertungs GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F1/00—Bending wire other than coiling; Straightening wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/10—Bending specially adapted to produce specific articles, e.g. leaf springs
    • B21D11/12—Bending specially adapted to produce specific articles, e.g. leaf springs the articles being reinforcements for concrete

Definitions

  • ABSTRACT The invention is concerned with a bending machine for wire or strip in which the raw material is advanced 22 Filed: 1
  • a bend is made by a mobile bending tool.
  • the bending tool is retractable from a working position on Foreign Application Priority Data Apr. 12, 1972 one side of the path of advance of the material, moveable to the other side of the path without intersecting 140/105, 72/307 v[51 1m.
  • the invention relates to a machine for bending wire or strip and comprising means for intermittently advancing raw material for bending step by step, the length of each step being the desired distance between each two successive bends, and an intermittently driven mobile bending tool which bends the wire or strip through the desired angle. around a stationary a'nvil after each step of advance.
  • the working stroke of the bending tool is preferably adjustable. Bending machines of this kind are used in particular inthe manufacture of vwire hoops for use in reinforced concrete.
  • the known bending machines are capable of making bends in only one direction, that is to say it is not possible to bend the wire or strip at a first bending location in the one direction and then, after advancing the wire or strip one step, make a bend in the opposite direction at a second location on the wire or strip; Nevertheless this requirement often occurs.
  • An arrangement of this kind would however be costly in construction due to the necessity of providing a driving 7 mechanism which can be coupled selectively to the one or to the other of the two mobile bending tools so as to obtain the desired changes in bending directions.
  • the aim in the present invention is to avoid these difficulties by providing a bending machine with which bends can be made in opposite directions, relative to the path of advance of the wire or strip, without it being necessary to couple the driving mechanism alternately to two different bending tools.
  • the problem is solved according to the invention in that a single bending tool is arranged to bend the wire or strip selectively in either of two opposite bending directions, away from the path of advance of the wire or strip, and the bending tool is mounted so that it is retractable from a working position on one side of the path and movable to the other side of the path, without intersecting the path, and then advanceable to a working position on the other side of the path.
  • the single mobile bending tool remains constantly connected to the driving mechanism, the direction of bending being changed-merely by changing between the forward and return strokes of the drive for making the bend.
  • Two stationary bending anvils may be positioned one on each side of the path of advance of the wire or strip, the bending tool cooperating selectively with the one or the other of the two stationary anvils for bending the wire or strip in the one direction or the other.
  • the bending tool can be mounted on a crank which oscillates about an axis which intersects the path of advance of the wire or strip, the two stationary anvils being positioned symmetrically, one on each side of the path.
  • the axle shaft of the crank supporting the mobile bending tool can be a sliding hollow shaft which slides in a direction perpendicular to the path of advance of the wire or strip.
  • the sliding hollow shaft retracts the bending tool transversely so that the bending tool can bypass the path of advance of the wire or strip, without colliding with the wire or strip which
  • the anvil is also mounted so that it can be shifted in position from one side of the path of advance of the wire or strip to the other side, the anvil also bypassing the path ofadvance of the wire or strip, during the shift, by retracting transversely out of the way.
  • the bending anvil and the bending tool are preferably both mounted on a common link which pivots, for the purpose of shifting the anvil and the tool to the other sides of the path of advance of the wire or strip, for changing the direction of the bend, on an axis intersecting the path, the link swinging around about the anvil, after the manner of a crank, for making the bend.
  • FIG. 1 is a diagrammatic side view of one machine
  • FIG. 1a shows a variant of a detail
  • FIG. 2 is a modified end view of the adjustable driving mechanism of the machine shown in FIG. 1, the drawing being modified by stretching it out in the direction of the arror P so as to show more clearly the relative positions of the individual parts,'without the parts overlapping each other in a confusing way;
  • vFIG. 3 illustrates the arrangements for moving the mobile bending tool and the ejector rod sideways, that is to say transversely with respect to the conveying path forthe wire or strip material;
  • FIG. 4 is an end view showing a modified driving mechanism
  • FIG. 5 is an end view corresponding to FIG. 2, but
  • FIG. 4 shows the modified driving mechanism of FIG. 4.
  • FIGS. 6 and 7 represents diagrammatically the principles used in several possible versions of the invention.
  • FIG. 8 represents diagrammatically a version of the bending mechanism based on the arrangement shown inFIG.7.
  • wire 1 which is to be converted into bent hoops, passes between two pairs of conveying rollers 2, 2a and 3, 3a which feed the wire through the machine by frictional grip.
  • the endless chain 10 passes over further sprocket wheels fixed to the conveying rollers 2, 2a and 3, 3a.
  • the driving mechanism ensures that when the coupling is engaged drive is transmitted from the electric motor 4 to the pairs of conveying rollers 2, 2a and 3, 3a.
  • the wire is advanced through the machine.
  • the advancing of the 4 wire continues until the desired length of wire has been fed through the machine, whereupon the coupling is contact with the upper surface of the wire.
  • the amount of spring thrust applied is adjustable by means of screw threaded spindles 12, 13.
  • the wire 1 After leaving the conveying rollers 2, 2a and 3, 3a the wire 1 passes through a straightener 14 of the known kind, which straightens the wire. Downstream of the straightener 14 there is a rotary friction-driven drum 15 mounted to pivot about an axis 16. The drum is thrust against the surface of the wire by a spring.
  • the rotary drum l drives a pulse sender for an electronic length-measuring device of the kind described in Pat. application Ser. No. 210.824 filed Dec. 22, .1971 which automatically controls the advancing of the wire and the cutting off of the desired lengths by the shears.
  • the wire Downstream of the friction-driven drum the wire passes through a shears consisting of a stationary shear blade 17 and a mobile blade 18, which cuts off the desired lengths of wire. Downstream of the shears the wire reaches the bending device proper which consists essentially, in the present example, of two stationary bending anvils 19, 19a and a mobile bending toll 20.
  • the drive for the bending tool 20 is arranged as follows.
  • An electric motor 21 transmits drive through a V-belt or the like to a flywheel 23 which can be coupled, by means of a coupling which is not shown in the drawing, to a gearwheel 24.
  • the gearwheel 24 is permanently engaged with a gearwheel 25 to the shaft of which is fixed an eccentric 26 which, acting through a connecting rod 27, applies an oscillating motion to a double pivot bearing 37 on which are pivoted the lower ends of a driving link 28 and an idle link 29.
  • the upper end of the idle link 29 is pivoted at 33'to the upper part of an adjustment link 30 whose lower end is pivoted in a stationary bearing 31.
  • the upper end of the adjustment link 30 is adjustable in position by means of an adjustment spindle 32, the adjustment link 30 pivoting during the adjustment movement in its lower stationary bearing 31.
  • the upper end of the driving link 28 is pivoted at 34 to one arm of a 2-armed rocker which rocks in a stationary rocker bearing 7 36.
  • the effective length of the driving link 28, that is to say the distance between its two pivots 34 and 37 is equal to the effective length of the idle link 29, that is to say the distance between its two pivots 33 and 37.
  • the linkage system described above makes it possible to adjust the angular movement of the rocker 35 steplessly all the way between 0 and a constructionally predetermined upper limit, during each half-rotation of the eccentric 26 through 180.
  • rotation of the eccentric 26 merely swings the two links 28 and 29 around together about the coincidence point, no movement being given to the rocker 35.
  • a driving spindle 38 Pivoted to the upper end of the other arm of the 2- armed rocker 35 there is a driving spindle 38 which is adjustable in position longitudinally by means of ascrew thread.
  • the driving spindle 38 connects the rocker 35 to a gearwheel 39 which engages with a gearwheel 40 which is fixed to the mobile bending tool 20 so that rotation of the gearwheel 40 swings the bending tool. Consequently rotation of the eccentric 26, acting through the connecting rod 27 and the driving link 28 and so oscillating the rocker 35 in its'stationary bearing 36, imparts oscillation to the driving spindle 38, the oscillation being transmitted through the gearwheels 39, 40 to the mobile'bending tool 20, which consequently oscillates with the gearwheel 40 about their common axis.
  • the angle through which the mobile bending tool 20 oscillates is determined by the position given to the adjustment link 30 by actuation of the adjustment spindle 32.
  • the rigid connection between the gearwheel 40 and the bending tool 20 is arranged as follows.
  • the gearwheel 40 is fixed to a hollow shaft 41 to which the bending tool 20 is also fixed.
  • the two parts 40 and 20 therefore cannot move relative to each other, neither axially nor in rotation.
  • the hollow shaft 41 itself is connected through a piston rod 42 to a piston 43 which slides back and forth in a hydraulic cylinder 44.
  • a helical spring 45 surrounding the hollow shaft 41, thrusts at one end against a collar 46 fixed to the hollow shaft and at the other end against a sliding sleeve 47, the
  • a pin 49 connects the sleeve 47 with an ejector rod 51 which slides back and forth in the interior of the hollow shaft 41, the pin 49 working in longitudinal slots 50 in the wall of the hollow shaft.
  • FIG. 3 The control system for the sliding movement of the hollow shaft 41 is shown in FIG. 3.
  • An electric motor 53 drives an oil pump 54 which sucks oil in through a suction filter 55 from an oil sump 56 and delivers the oil under pressure through a delivery line 57.
  • the pressure in the delivery line 57 is kept constant by a constant-pressure valve 58.
  • the flow of hydraulic oil is controlled by an electro-hydraulic slide valve 59 and two throttling valves 60. Depending on the position of the slide valve 59, the piston 43 moves towards the right or towards the left, as indicated by the two arrows a and b.
  • the bending angle can if desired be adjusted by hand, as represented in FIG. 1.
  • powered adjustment can be provided by a positioning motor 61, as indicated in FIG. 1a.
  • the bending tool 20 is returned to its initial position.
  • the drive for the shears is essentially similar to the other two drives, for advancing the wire and for the bending mechanism.
  • An electric motor 62 transmits drive through a V-belt 63 to a flywheel 64 which can be coupled to a gearwheel 65 which engages with a gearwheel 66 which drives the mobile shear blade 18 through an eccentric 67 and a connecting rod 68.
  • the electro-hydraulic slide valve 59 When the wire has been cut, the electro-hydraulic slide valve 59 is moved into the position crossed flow paths. This has the result that the piston 43 in the cylinder 44 is thrust towards the left, in the direction of the arrow b.
  • the piston rod 42 thrusts the ejector rod 51 in the interior of the hollow shaft 41 towards the left, the pin 49 sliding towards the left in the longitudinal slots 50 in the wall of the hollow shaft, the pin sliding thesleeve 47 to the left over the surface of the hollow shaft 41, compressing the helical spring 45.
  • the ejector rod 51 ejects the finished loop out of the gap between the two stationary bending anvils 19 and 19a.
  • the electro-hydraulic slide valve 59 has been returned to its neutral position, the helical spring thrusts the ejector rod back into its position of rest.
  • the mobile bending tool 20 is driven by a, preferably hydraulic, pressure applied to a piston in a cylinder 81.
  • Hydraulic control can be provided by means of a slide valve, as already described. This need not be discussed in detail again at this point.
  • -A piston rod 82 is pivoted at 83 to a gearwheel39 which is permanently engaged with a gearwheel 40 fixed to the bending tool 20, as already described for the FIGS. 1 to 3 example.
  • the bending angle is determined by a stop-bar 85 fixed to the gearwheel 39 and cooperating with adjustable counter-stops 84, 84a. It will be observed that this arrangement doesno provide any facility for automatically adjusting the bending angle during operation of the machine. This kind of adjustability is a special advantage of the driving mechanism represented in FIGS. Ho 3.
  • FIG.'6 The versions of the invention described above all use a bending device whose principle of operation is represented diagrammatically in FIG.'6.
  • Two stationary bending anvils 19 and 19a are positioned on each side bent.
  • a mobile bending tool positioned at the location 20 in FIG. 6, on one side of the path B, cooperates with the stationary bending anvil 19, bending the wire by swinging around into the position 20' on the other side of the path B.
  • the mobile bending tool cooperates with theother stationary bending anvil 19a.
  • FIG. 7 there can if desired be used only a single stationary bending anvil 19 cooperating with a mobile bending tool 20. In this case to change the direction of bending the two parts 19 and 20 both move across into new positions 19, 20 on the other sides of the path B.
  • FIG. 8 A simple construction based on the principle represented in FIG. 7 is shown diagrammatically in FIG. 8.
  • a bending anvil 19 in the form of a roller is mounted rotatable on a shaft 102 to which is fixed a pinion 101 which engages with a rack bar 100.
  • a link 103 connects the shaft l02 to a bending tool 20.
  • the shaft 102 is mounted-to slide on a vertical guide 104, drive in this sliding movement by a hydraulic piston which is not shown in the drawing.
  • the changing of the bending direction is effected as follows. After retraction of the parts 19, 20, out of the way of the path B, the shaft 102 is slid vertically downwards on the guide 104, powered by the hydraulic piston, from the position shown in full .lines in FIG.
  • a machine for bending wire or strip comprising means for intermittently advancing raw material for bending along a path, step by step, the length of each step being the desired distance between two successive bends, a stationary anvil, ane an intermittently driven mobile bending tool which bends said wire or strip through a desired angle around said anvil; an improved mounting for said bending tool comprising means for retracting said bending tool from a working position on a selected one side of said path, means for moving said retracted bending tool to the other side of said path without intersecting said path, and means for advancing said bending tool to a working position on said other side of said path whereby said single bending tool is adapted to bend said wire or strip selectively in either of two opposite bending directions away from said path.
  • a machine according to claim 1 wherein there are two stationary bending anvils positioned one on each side of said path, said bending tool co-operating selectively with one or other said two anvils for bending said wire or strip in one of two said directions.
  • a machine according to claim 2 wherein said two anvils are positioned symmetrically, one on each side of said path and said bending tool is mounted on a crank, there being means oscillating said crank about an axis intersecting said path.
  • crank has a shaft supportingsaid bending tool and an ejector rod for bent wire or strip slides independently within said shaft.
  • a machine wherein a single bending anvil is provided for bending said wire or strip in both of said directions, said anvil having means re tracting said anvil from a working position on one side of said path, means moving said anvil to said other side of saidpath without intersecting said path, and means advancing said anvil to a working position on said other side of said path.
  • a machine wherein said anvil and said bending tool are both mounted on a common link, there being means pivotally mounting said common link about an axis intersecting said path for the purpose of shifting said anvil and said bending tool to alternate sides of said path, and means adapted to swing said link about said anvil after the manner of a crank for making a bend.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US00322878A 1972-04-12 1973-01-11 Bending machine for wire or strip Expired - Lifetime US3823749A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT318272A AT314319B (de) 1972-04-12 1972-04-12 Biegemaschine für draht- oder bandförmiges Material

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US3823749A true US3823749A (en) 1974-07-16

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US00322878A Expired - Lifetime US3823749A (en) 1972-04-12 1973-01-11 Bending machine for wire or strip

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US (1) US3823749A (fr)
JP (1) JPS5215259B2 (fr)
AT (1) AT314319B (fr)
BE (1) BE791166A (fr)
BR (1) BR7301212D0 (fr)
CA (1) CA975669A (fr)
CH (1) CH547133A (fr)
CS (1) CS181718B2 (fr)
DE (1) DE2254877B2 (fr)
ES (1) ES411213A1 (fr)
FR (1) FR2179702B1 (fr)
GB (1) GB1351917A (fr)
IT (1) IT971194B (fr)
LU (1) LU66447A1 (fr)
NL (1) NL163730C (fr)
SU (1) SU452946A3 (fr)
YU (1) YU34853B (fr)
ZA (1) ZA73150B (fr)

Cited By (14)

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Publication number Priority date Publication date Assignee Title
US4049026A (en) * 1975-04-18 1977-09-20 Remigio Del Fabro Bending apparatus having a shaped mandrel used in automatic bending machines for metal wire and bar stock
US4248273A (en) * 1979-02-28 1981-02-03 Marcello Del F Stirrup machine
US4462237A (en) * 1979-02-15 1984-07-31 Josef Kauferle KG Method of bending frame material for the production of compound plates, particularly compound glass panes
US4562754A (en) * 1982-03-04 1986-01-07 Usm Corporation Methods for constructing cutting tools
US4656860A (en) * 1984-04-19 1987-04-14 Wolfgang Orthuber Dental apparatus for bending and twisting wire pieces
US5136867A (en) * 1987-09-09 1992-08-11 Spuhl Ag Automatic frame bending machine for bending of steel rods or band steel
US5243844A (en) * 1990-05-21 1993-09-14 Peter Lisec Process for producing curved sections in hollow profile strips
US5617754A (en) * 1995-12-21 1997-04-08 Kenneth A. Kauffman Single stage two plane coiled reinforcing bar stock straightener
WO1998006516A1 (fr) * 1996-08-13 1998-02-19 Carl Ondracek Cintreuse automatique de lettres en relief
US5771725A (en) * 1995-01-11 1998-06-30 Mizukawa; Suehiro Method of producing a band blade, a method of bending a strip material, and an apparatus for bending a stip material
US5787750A (en) * 1995-06-22 1998-08-04 Song; Byung-Jun Folding system for a cutting blade
US20070095006A1 (en) * 2005-11-01 2007-05-03 Konersmann Ronald D Lightweight portable concrete enclosure and associated method of construction
CN102274909A (zh) * 2011-05-26 2011-12-14 大连大金马基础建设有限公司 多边形螺旋箍筋制作转盘
CN104325045A (zh) * 2014-09-02 2015-02-04 吴家集 液压无齿弯曲机构

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FR2270584A1 (en) * 1974-05-07 1975-12-05 Energetics Science Appts for detecting measuring nitrogen oxides
IT1024224B (it) * 1974-11-15 1978-06-20 Del Fabbro Remigio Maochina staffarice ad alimen tazione continua oberante a recupero di materiale e relativo me todo di oberare per la qustruzio ne delle dette staffe
JPS51124657A (en) * 1975-04-24 1976-10-30 Fuji Industries Co Ltd Method of and apparatus for continuously bending spiral wire rod for reinforcing bar
IT1059392B (it) * 1976-01-08 1982-05-31 Fabro Marcello Del Metodo di piegatura e relativa macchina piegatrice di barre o filo metallico
AT368724B (de) * 1976-05-28 1982-11-10 Hufnagl & Co Rista Draht Biegemaschine fuer draht
JPS5823643B2 (ja) * 1977-07-13 1983-05-17 松下電器産業株式会社 視聴覚カ−ド再生装置
JPS5643511A (en) * 1979-09-19 1981-04-22 Toshiba Corp Supervisory device of developer
AT365484B (de) * 1979-10-02 1982-01-25 Evg Entwicklung Verwert Ges Einrichtung zum automatischen zufuehren von stabmaterial zu einer biegemaschine fuer betonbewehrungsbuegel
JPS5680674A (en) * 1979-12-07 1981-07-02 Nippon Denso Co Detector for quantity of refrigerant
AT367322B (de) * 1980-01-16 1982-06-25 Evg Entwicklung Verwert Ges Anlage zum herstellen von buegeln verschiedener gestalt und groesse, insbesondere von betonbewehrungsbssgeln
AT377713B (de) * 1982-08-23 1985-04-25 Evg Entwicklung Verwert Ges Biegevorrichtung fuer draht- oder bandfoermiges material
AT378489B (de) * 1983-04-18 1985-08-12 Bucher Franz Schneidemaschine zur herstellung von abgelaengten bewehrungsstaeben aus bewehrungsdraht
AT378135B (de) * 1983-05-18 1985-06-25 Evg Entwicklung Verwert Ges Biegemaschine fuer draht- oder bandfoermiges material
AT381887B (de) * 1983-12-13 1986-12-10 Evg Entwicklung Verwert Ges Schere zum ablaengen eines materialstranges
FR2602159B1 (fr) * 1986-08-04 1993-12-10 Latour Fils Procede et machine de pliage de fils metalliques
EP0274240A3 (fr) * 1986-12-22 1988-10-26 Eubanks Engineering Co. Installation de traitement de fil de fer
US5161401A (en) * 1990-05-21 1992-11-10 Peter Lisec Apparatus for producing bent sections in hollow profile strips
US6287405B1 (en) 1999-02-23 2001-09-11 Michael J. Stevenson Method and composition for cosmetically repairing a blemish in a polyolefin object
CN114101419A (zh) * 2021-11-08 2022-03-01 甘肃省安装建设集团有限公司 一种用于扁铁条煨弯的新型工装夹具

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US2770262A (en) * 1952-06-17 1956-11-13 Springs Inc Machine for forming spring-wire into zig-zag material and methods of forming zig-zagspring material
US3245433A (en) * 1962-05-10 1966-04-12 Geometric Spring Company Wire bending machine
US3184949A (en) * 1962-10-31 1965-05-25 Ray Lab Inc Automatic tube bender

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4049026A (en) * 1975-04-18 1977-09-20 Remigio Del Fabro Bending apparatus having a shaped mandrel used in automatic bending machines for metal wire and bar stock
US4462237A (en) * 1979-02-15 1984-07-31 Josef Kauferle KG Method of bending frame material for the production of compound plates, particularly compound glass panes
US4248273A (en) * 1979-02-28 1981-02-03 Marcello Del F Stirrup machine
US4562754A (en) * 1982-03-04 1986-01-07 Usm Corporation Methods for constructing cutting tools
US4773284A (en) * 1982-03-04 1988-09-27 Busm Co., Ltd. Apparatus for constructing tools
US4656860A (en) * 1984-04-19 1987-04-14 Wolfgang Orthuber Dental apparatus for bending and twisting wire pieces
US5136867A (en) * 1987-09-09 1992-08-11 Spuhl Ag Automatic frame bending machine for bending of steel rods or band steel
US5243844A (en) * 1990-05-21 1993-09-14 Peter Lisec Process for producing curved sections in hollow profile strips
US5771725A (en) * 1995-01-11 1998-06-30 Mizukawa; Suehiro Method of producing a band blade, a method of bending a strip material, and an apparatus for bending a stip material
US5870919A (en) * 1995-06-22 1999-02-16 Sds Usa, Inc. Folding system for a cutting blade
US7694543B2 (en) 1995-06-22 2010-04-13 Seoul Laser Dieboard System Co. Folding system
US5787750A (en) * 1995-06-22 1998-08-04 Song; Byung-Jun Folding system for a cutting blade
US8327679B2 (en) 1995-06-22 2012-12-11 Seoul Laser Dieboard System Co., Ltd. Folding system for a cutting blade
US20070068212A1 (en) * 1995-06-22 2007-03-29 Byung-Jun Song Folding system for a cutting blade
US6128940A (en) * 1995-06-22 2000-10-10 Sds Usa, Inc. Folding system for a cutting blade
US6405574B2 (en) * 1995-06-22 2002-06-18 Sds Usa, Inc. Folding system for a cutting blade
US20030192361A1 (en) * 1995-06-22 2003-10-16 Byung-Jun Song Folding system for a cutting blade
US5617754A (en) * 1995-12-21 1997-04-08 Kenneth A. Kauffman Single stage two plane coiled reinforcing bar stock straightener
US5881591A (en) * 1996-08-13 1999-03-16 Ondracek; Carl Automatic channel letter bending machine
WO1998006516A1 (fr) * 1996-08-13 1998-02-19 Carl Ondracek Cintreuse automatique de lettres en relief
US20070095006A1 (en) * 2005-11-01 2007-05-03 Konersmann Ronald D Lightweight portable concrete enclosure and associated method of construction
CN102274909A (zh) * 2011-05-26 2011-12-14 大连大金马基础建设有限公司 多边形螺旋箍筋制作转盘
CN102274909B (zh) * 2011-05-26 2013-05-29 大连大金马基础建设有限公司 多边形螺旋箍筋制作转盘
CN104325045A (zh) * 2014-09-02 2015-02-04 吴家集 液压无齿弯曲机构
CN104325045B (zh) * 2014-09-02 2016-09-07 吴家集 液压无齿弯曲机构

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FR2179702A1 (fr) 1973-11-23
AT314319B (de) 1974-03-25
CA975669A (en) 1975-10-07
NL7215814A (fr) 1973-10-16
YU34853B (en) 1980-04-30
NL163730B (nl) 1980-05-16
JPS4917363A (fr) 1974-02-15
LU66447A1 (fr) 1973-02-01
AU5364073A (en) 1974-09-26
CH547133A (de) 1974-03-29
JPS5215259B2 (fr) 1977-04-27
DE2254877A1 (de) 1973-10-25
ZA73150B (en) 1973-09-26
IT971194B (it) 1974-04-30
YU297372A (en) 1979-10-31
NL163730C (nl) 1980-10-15
ES411213A1 (es) 1975-12-01
DE2254877B2 (de) 1976-09-30
FR2179702B1 (fr) 1975-06-13
SU452946A3 (ru) 1974-12-05
BE791166A (fr) 1973-03-01
BR7301212D0 (pt) 1974-06-27
CS181718B2 (en) 1978-03-31
GB1351917A (en) 1974-05-15

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