CA1308639C - Small-diameter metallic conduit bending machine - Google Patents
Small-diameter metallic conduit bending machineInfo
- Publication number
- CA1308639C CA1308639C CA000597647A CA597647A CA1308639C CA 1308639 C CA1308639 C CA 1308639C CA 000597647 A CA000597647 A CA 000597647A CA 597647 A CA597647 A CA 597647A CA 1308639 C CA1308639 C CA 1308639C
- Authority
- CA
- Canada
- Prior art keywords
- bending
- metallic conduit
- stationary frame
- guide surface
- small
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005452 bending Methods 0.000 title claims abstract description 152
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000003466 welding Methods 0.000 claims description 6
- 230000002452 interceptive effect Effects 0.000 abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 230000029058 respiratory gaseous exchange Effects 0.000 description 4
- 101150111329 ACE-1 gene Proteins 0.000 description 2
- WTEVQBCEXWBHNA-YFHOEESVSA-N neral Chemical compound CC(C)=CCC\C(C)=C/C=O WTEVQBCEXWBHNA-YFHOEESVSA-N 0.000 description 2
- WTEVQBCEXWBHNA-UHFFFAOYSA-N Citral Natural products CC(C)=CCCC(C)=CC=O WTEVQBCEXWBHNA-UHFFFAOYSA-N 0.000 description 1
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- WTEVQBCEXWBHNA-JXMROGBWSA-N citral A Natural products CC(C)=CCC\C(C)=C\C=O WTEVQBCEXWBHNA-JXMROGBWSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
Classifications
-
- 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
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
-
- 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
-
- 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
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
- B21D7/022—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment over a stationary forming member only
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A small-diameter metallic conduit bending machine includes a stationary frame which is shaped so as to substantially conform to R 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 bending member is made movable toward the stationary frame and retractable from the moving area of the metallic conduit.
A small-diameter metallic conduit bending machine includes a stationary frame which is shaped so as to substantially conform to R 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 bending member is made movable toward the stationary frame and retractable from the moving area of the metallic conduit.
Description
1 30363q S~all-Diameter l~[etallic Condui-t ~ending Machine BACKGROUN~ OF TH~ INV~N~ION
Field of the Invention This invention relates to a machine for bending a small-diameter metallic condui-t at several points and more ~articularly, to a small-diameter metallic conduit bending machine ada~ted to shape a metallic conduit whose individual bend portions differ in the bend direction three-dimensionally from one another, not lying on the same plane, such as the fuel pipeline or brake pipeline of a car.
Description of the Prior Art A conventional bending machine of the foregoing t~e includes a required number of bending units disposed corresPondingly to a plurality of bend portions, each unit being configured as shown in ~ig. 12 so that with respect to each bending ~rocess, a receiving roll 21 is moved by a cylinder 22 to come into contact with a metallic conduit 23, and then a bending roll 24 is moved by a cylinder 25 to bend the me-tallic conduit 23. In the drawing, 26 and 27 are mounts, 28 and 29 are stays, and 30 is a basemen-t.
According to the foregoing conventional bending ~g ., .
1 3C~,639 ~achinel ~owever, since the bending process is carried out by moving the receiving roll 21 and the bending roll 24 b~ means of t'ne respective c~linders 22 and 25, one bending process needs two ac-tions; thus, the processing time is long. Since the bending proces~ is completed when the piston rods of both cylinders 22 and 25 are in an extended s-tate, upon sunply of a pressurized fluid into the cylinder ( generall~J, an air cylinder ) at the time of bending, the bending moment imposed on the piston rod increases, and flexure resulting from the reaction caused at the time of bending appears in the stays 28 and 29 and mounts 26 and 27 for supporting the cylinders 22 and 25; as a result, a minute discrepancy ( called ~breathing" by those skilled in the art ) appears between the receiving roll 21 and the bending roll 24, thereby resulting in variations in products. To eliminate such a discrepancy, it is necessary to make the stays 28 and 29 and the mounts 26 and 27 thick and rigid; consequently, -the machine becomes large in size and heavy ( but, in spite of such ~rovisions, some discrepancy canno-t be eliminated ). Further, since the whole machine is designed and composed while giving consideration -to the position, orientation, etc. of each o~ the cylinders 22 and 25, receiving roll 21 and bending roll 24, a long 1 3~63~
time ls needed for manuf?-c-ture, such as assembll~ and adjustmen-t; as a result, the machine cannot be put in service in time where the start of ~ass produc-tion is settled. In addition, since the nurnber of ~arts and of moving ~or-tions is large, the manufacturing cost is very high and the durabilit~ is inferior.
Es~eciall~, where one bending mechanism and a subseauent bending mechanism are to be disposed close to each other, the two mechanisms cannot be dis~osed or must be moun-ted using a com~licated mechani~m because they would in-terfere with each o-ther even partl~J.
Further, when the metallic conduit is brandished during bending, it under movement tends to interfere with the bending member.
S~~ ARY OF THE INVENTION
Therefore, it is the object of the present invention to ~rovide a bending machine ca~able of ~reventing the occurrence of interference of a metallic conduit with a bending member when the metallic conduit is brandished during bending to reach a nex~t given position, ~reventing the a~earance of a discre~ancy ( breathing ), com~letlng one bending ~rocess through one action to shorten the ~rocessin~ -time, and making it eas~ -to take out the ~ 30O639 the metallic condui-t com~letel~ bent and sha~ed9 which is small in si~e, light in weight, low in cost, and eas~
to manufacture.
To achieve the foregoing object, a small-diameter metallic conduit bending machine according to the ~resent invention com~rises a sta.tionar~ frame which is formea by connecting bar stock or ~ine stoc~ into a sha~e substan-tiall~ confor~ing to tne finished curved sha~e of a metallic conduit over the whole length; at least oreof two, first and second bending sections ~rovided in the stationary frame, the first be~ding section including a first guide surface defined by a surface which has a curvature smaller than the bend radius of -the metallic conauit in the lengthwise direction and is substantially orthogonal to the bend ~].ane of the metallic conduit in the ~Nidthwise direction, and the second bending section including a second guide surface which is defined by a surface substantially ~arallel to the bend plane and a guide member which is mounted to the stationary ~rame in a direction substantiall~ orthogonal to the second guide surface and has a curva-ture smaller -than the bend radius of the metallic conduit; a bending member which is moved by an actuator attached via a bracket to the stationary frame toward -the stationary frame from thereoutside 1 3()''~3q so tha-t the metallic conclui-t can be bent so as to lie alon~ the first guide surface in the first bending section or along the second guide surface and -the ~ide member in the second bending section; and means Eor removing the bending member from the moving area of the metallic conduit when the bending member is -to interfere with the metallic concduit which is moving as the result of the bending process of a preceding stage.
As will be a~reciated from the foregoing, the ~resent invention performs bending by the use of the stationary frame with the guide surface and the bending member which is moved from ou-tside the guide by the actuator, such as air cylinder or rotar~J actuatort at-tached to the frame via the bracket so that the metallic conduit can be bent so as to lie along the guide surface or along the guide surface and the guide member.
Therefore, since the actuator for moving the bending member is coupled -to the stationary frame by welding or the like, flexure is prevented from anpearing in a stay or the like. Since the bending process is carried out preferably when the piston rod of the air cylincler is in a pulling stroke no-t in a ~ushing stroke ( in an extended state ), in contrast to the prior art, no a~reciable bending moment is imposed on the ~iston rod 1 3~ 3q or the like at the ter~ination of each bending process, so that the influence of looseness of a bush provided for the piston rod becomes minimum; thus, any minute discre-panc!~ ( breathing ) in relation to the bending member can be prevented from a~earing.
Furthert to avoid tne situation wherein the metallic conduit, which is moving or being brandished as the result of the bendin~g ~rocess of a ~receding stage, interferes with the bending member, or wherein the bending member lies on -the bend ~lane of the preceding stage, the actuator for moving the bending member i5 rotated a certain angle via a bracket to prevent the bending member from interfering, or the bending member is previously retracted by a cylinder attached to the dis-tal end of the actuator spaced a certain distance from the bend ~lane of the frame via the bracket to prevent the bending member from interfering. '~Yhen bending the metallic conduit, the bending member is ~rojected to the bend plane to ~erform bending, and after -the com~letion of bending of the metallic conduit, the bending member is returned to its retracted ~osition; thus, the metallic conduit completed through all bending processes can be readily taken out. In addition, since the frame is readil1J formed by welding or the like and then the bendintg 1 3 '~ 3 9 member ~ inclusive o~ the actuator ) i~ dis~osed so as to face the frame, the mac~ine can be made small in size ?~d li~nt in ~7eight.
BRI3F DESCRIPTION OF THE DR~'NI~GS
Fig. 1 is a schematic persPective view showing a stationary frame used in the ~resent invention;
Fig. 2 is an enlarged sectional view taken along line II-II of Fig. l;
Fig. 3 is an enlarged sectional view taken along line III-III of Fig. l;
Figs. 4(a) and 4(b) are enlarged sectional views taken along line IV-IV and line IV'-IV', respectively, of Fig. l;
Fig. 5 is an enlarged sectional vie~,~ taken along line V-V of ~ig. l;
~ ig~ 6 is a fragmentar~ perspective view showing an embodiment of a bending machine according -to the pre3ent invention;
Fi~gs. 7(A) to 7(F~ are front views ex~lanator~ of the operation of the embodiment shown in Fig. 6;
Fig. 8 is a plen view corresponding -to Fig. 7;
Fig. 9 is a fragmentary ~erspective view showing another embodiment of the ~resent invention;
1 3C '63q ~ igs. lO(A) to lO(F) are Ir~nt views explanator~ of the operation of the embodiment shown in ~i~. 9;
ig. 11 is ~ plQn vi~w corres~ondin~ to ~ 10; ~nd Fig. 12 is a ~ers~ective view showing a conventional bending machine.
DETAI~ED DESCHIP'rION OF ~HE PREFERRED EMBODIMENTS
In Figs. 1 through 5, reference numeral 1 designates an elongate stationary frame made of bar stock, ~i~e stock ( Fig. 4(b) ), or the like in continuous form by welding 9, which substantially conforms in curved shape to a metallic conduit 2 over the whole length and has, in the vicinit~ of a bending member 5, preferably within the range of bend angle9 a first guide surface 1' defined by a surface whose widthwise direction is substantially orthogonal to a bend plane and a second guide surface 1"
defined by a surface whose widthwise direction is subs-tantially parallel to the bend plane, the sectional contour of the frame including a flat portion and preferably being made substantially quadrangular.
~owever, the sectional sha~e of the second guide surface 1" is not necessarily limited to the above, but may -take a circular shape; in -this la-tter case, the second guide surface 1" means a surface which extends in a d.irection substartial~ orthogonal to a ~lide member 3 hereinafter described and is formed b~ lines -tan~ential to the outer peri~'neral surface of the metallic conduit 2. At a given position in relation to the frame 1 effec~tive in bending the metallic conduit 2, there is disposed a guide member 3 which has a curvature smaller than the bend radius of the metallic condui-t 2 and is secured b,~J welding or the like in a direction substantially orthogonal to both the first guide surface 1' and the second guide surface 1". ~he curvature and shape of each of the first guide surface 1', second guide surface 1", guide member 3, frame 1, etc. are determined in consideration of the spring bac~ o~ the metallic conduit 2 occurrlng at the time of bending. Here, the guide member 3 may be shaned like a Plate piece as shown in Fig. 4(a) or like a block as shown in Fig. 4(b). Although the frame 1 illustrated is secured on a basement ( not shown ) b~J means of a required number of Posts 4, according to the present invention, the basement is not necessarily required if the ~osts 4 are connected together, in contrast to the prior art. 5 designates a bending member which is disposed as being able to move toward the stationary frame 1 while ~ressing the metallic condui-t 2 so as to lie along the f`irst guide surface 1' or along the second 1 3C3~)3q guide surface 1" and the guide member 3. In Fig. 2, the bending member 5 ~or ~erforming bending in coo~eration ~Nith the first guide surface 1~ is disposed so that its outer peri~heral surface faces the first guide surface 1'.
In Fig. 3, the bending member 5 for performing bendi~g in cooPeration with the second guide surface 1" and the guide member 3 is disposed so that its moving direction is substantially ~arallel to the second guide surface 1"
or intersects therewith with a slight inclination.
5' designates -the bending member before the bending process in Fig. 1.
The bending member 5 is attached to a lever 9 of ~ shape, for exam~le, which is moved b~ an actuator ( a cylinder 8a, in the embodiment ) 8 attached via a bracket -to the frame 1 ( Figs. 6 to 8 ), or is attached via an angle piece 8c to the point of a Piston rod 8b of the actuator 8 ( ~igs. 9 to 11 ). Of course, the embodiment of Figs. 9 through 11 mav use a lever for a-ttachment.
According to the prior art, as described above7 the metallic conduit 2 sometimes interferes with the bending member of a succeeding stage while the metallic conduit 2 is moving ( is being brandished ) as the result of the bending process of a preceding sta~e. The present invention avoids -the in-terference of the metallic condui-t -~ 10 --with the bending member 5 by con-igurlng the embodiments as below.
~ rnat is, in tne embodimen-t of ~igs. o through 8, one end of the lever 9 for ~oving tne bending ~ember 5 is pivoted -to one end of a beam 10, the beam 10 has a forked piece lOa at its other end and a holding piece 11 attached integrally to its central portion, the nolding piece 11 is rotatably connected via a sunport shaft 12 with a bracket 8d secured to the frame 1, and an air cylinder ( not shown ) is coupled to the bean 10; accordingly, both ends of tne beam 10 can swing verticall~ or it can rotate a certain angle, that is, the bending mernber 5 can shift a certain angle. Further, the other end of the lever 9 is pivoted to the piston rod 8b of the actuator 8 ( the drawing shows the air cylinder 8a therefor )~ and an arm piece 13a connected directly with a collar portion 13 of the cylinder 8a is fitted to the forXed piece lOa of the beam 10 and rotatably supported b~J a support shaft 14; accordingly, upon the extension/retraction action o-f the piston rod 8b, the actuator 8 itself swings la-terally to put the bending member 5 in a bendable state.
S~ecificall~, as shown in ~igs. 7 and 8, the bending nember 5 ~ivotable about the support shaft 12 is normally held in the ( shifted-down ) state A t Fig. 7(A) ) so I 3 (J '~ 9 that the ~etallic conduit 2 can~ot i~terfere :lith the bendin~ member 5 even when it is moved or bent b~J the bending ~rocess OI` the oreceding state. ~hen, vhen due to the bending ~rocess of the ~receding stage tne metallic conduit 2 comes into contact with the bending section of the stationary frame 1 ( Fig. 7(B) ), the bending member is shifted u~ward as shown in Fig. 7(B) and comes to the state C ( Fig. 7(C) ). Then, the ~i~ton rod 8b is retracted, so that the bending member changes from the state C to the ( bending ) state D ( Fig. 7(D) ) to ~erfo~Q bending. In this bending ~rocess, the actuator 8 mounted to -the frarne 1 swings laterall~ about the su~por-t shaft 14 as shown in Fig~ 8 ( from position C to D ) so that tne bending member 5 can bend the rnetallic conduit 2 so as to lie along -the first guide sur~ace 1' or along the second guide surface 1" and the guide member 3.
After the completion OI bending, the bending rnember 5 returns to the state E ~ Fig. 7(E) ), that is, the actuator 8 swings rigntward as shown in Fig. ~ ( to position E ). ~hen, the bending member is shifted down-ward and waits for a next bending ~rocess ~or another metallic conduit at ~osition F ( or in t'ne sta-te F of Fig. 7(F) ).
It should be noted that the bending member is held 1 3 r~ 3 ~
in the state D until ~ll bending stages are com~leted, hence, each bending member serves as a ~ressing/~osition-ing me~ns with respect to each succeeding bending ~rocess, thereby enhancing the accurac~ of tne bending process.
On the other hand, in the embodiment of Figs. 9 through ll, the bending member 5 is attached~-to the point of a piston rod 15a o~ a cylinder 15 se~arately provided, instead of belng connected dlrectly to the piston rod 8b.
A collar ~ortion 13 o~ the air cylinder 8a is secured to a bracket 7 attached to the stationary frame lo In thls case, the bending member 5 is normally retracted by the cylinder 15 so that the bending member 5 will not disturb the moving of the metallic conduit 2. That iS9 the air cylinder 8a is disposed while leaving a certain spaclng with respect -to the bend plane of the stationary rame 1.
~t the time o~ bending, the bending member 5 is projected by the cylinder 15 and moved to a predetermined position 50 as to lie along the -~rame 1 by the retraction action o~ the piston rod 8b.
Specifically, as shown in Figs. 10 and ll, the bending member 5 is normally held in the retracted state A ( Fig. lO(A) ) by means of the cylinder 15 so that the metallic conduit 2 cannot interfere with the bending member 5 even when i-t is bent b~ the oending process of 1 30'',~3~
a ~receding s-tage. Then, w'nen due to the bendlng ~rocess o~ the ~receding stage the metallic conduit 2 comes into contact wi-th t~e bending section of the stationary fra~e 1 as shown in Fig. lO(B), the c~Jlinder 15 is actuated to extend and ~roject the ~iston rod 15a to a ~redetermined ~osition as show~n in Fig. lO(C). Then, the piston rod 8b is retracted, so -that the bending member changes from -the state C to the ( bending ) state D ( Fig. 10(~) ) to perform bending. In this bending process, the bending member 5 bends the metallic conduit 2 so as to lie along the first guide surface 1' or along the second guide surface 1" and the guide member 3. Here, the cylinder 8a, which is attached to the ~rame 1 hereinabove7 ma~ be pivoted between the collar portion 13 and the bracket 7 so that the cylinder 8a can swing. Following the above, the bending member 5 is changed to the state E ( Fig~ 10 (E) ) b~ the extension of the piston rod 8b and then is shifted downward to the state F ( Fig. 10(~) ) b~ the retraction of the piston rod 15a. In this state F, the metallic conduit completed through all bending processes is taken out and a next bending ~rocess ~or another metallic conduit is awaited.
It should be noted that if the bending member is held in the s-tate D until all bending stages are com~leted, _ 14 -1 30",63~
each bending ~enber serves as a ~ressing,~ositioning .neans with res~ect to each succeeding bending ~rocess, the~eby e~hancing the accuracy ol the bending ~rocess.
In ~erEormlng the bending of the metallic conduit 2, first, one end of the straight metallic conduit 2 is loc~ed and secured to a loc~ member 16 dis~osed at one end of the stationar~ ~rame 1 by means of an end fixture 17 as shown in ~ig. 1 ( a first mode ), or a given ~oint of an intermediate ~ortion of the conduit that is indexed using a sto~per or the like ( not shown ) is secured by a clam~ tool ( not shown ) or the like ( a second mode )~
Then, the bending ~rocess is carried out, from the secured end side toward the free end side in the first mode, or from the secured portion toward both free ends in the second mode, by ~rogressively causing the straight or circular movement of the bending member 5 toward the frame 1 so that the metallic conduit 2 can be ~ressed so as to lie along the first guide surface 1' or along the second guide sur,ace 1" and t~e ~uide member 3 of -the frame 1. Of course, the machine of the ~resent invention can be used in bending not onl~ metallic conduit, but also bar stock. Although the actuator made of the air cylinder is illustrated in the drawing, a rotary actuator ( not shown ) ma~r be used.
1 3~ 3q As described above in greater de-tail, according to the ~resent invention, the bending process is carried out b.~ means of the stationary ~r~me 1 and the bending member ~ which is moved from outside the guide member 3 b~ the 2ctuator 8 attached to the frame 1 directly or via the ~ost 4 or bracket so that tne metallic conduit 2 can be bent so as to lie along the guide member 3 and the first guide surface 1' or secon~ guide surface 1". Therefore, since the actua-tor 8 for moving the bending member 5 is cou~led to the stationar~ frame 1, flexure is prevented from a~pearing in the stay or the like. Further, since the bending member 5 is actuated preferabl!J when -the actuator 8 is pulling its piston rod, the influence of looseness of a bush provided for the piston rod -that becomes worse when the ~iston rod is pushing or in an extended sta-te is reduced to a minimum, in contrast -to the prior art, and it is possible to nearl~ prevent the imposition of the bending moment. Therefore, it is possible to prevent an~J minute discrepanc~J ( breathing ) from appearing be-tween the bending member 5 and the guide member 3, thus to fabricate curved products of high preciseness.
Further, even if the collrse o~ bending of the metallic conduit 2 seems to interfere with the bending -13~ 39 member 5, because the machine is configured so that the bendin member is ~reviousl~ shifted or retracted and at the time of bending, it is returned or ~ro~ected to a ~redeter~ined ~osition, the bending units can be dis~osed close to each other, the setting of these units can be achieved without using an~y com~licated mechanism, the individual bending processes can be contiguously performed without troubles, and the finished metallic conduit can be readily taken out because the bending members are retracted after the com~letion of bending. ~urther, the whole bending machine is com~osed sim~ly by cutting a square bar or the like on the market to given lengths, be~ding, and welding together into a continuous sha~e so as to substantiall~ conform to the finished curved shape of the metallic conduit over the whole length, by providing the ~late-like guide members 3 at given ~ositions to comPlete the frame 1, and by disposing the bending members 5 ( inclusive of the actuators 8 ) so that the~J can move toward the frame; accordinglv, as compared with the ~rior art, the number of ~arts is remarXably decreased; hence, the machine can be made small in size, light in weigh-t, and low in cost. ~'urther, since the machine can be manufactured in a very short time, it can be surel~J pllt in serviceable state before the start of mass production.
Field of the Invention This invention relates to a machine for bending a small-diameter metallic condui-t at several points and more ~articularly, to a small-diameter metallic conduit bending machine ada~ted to shape a metallic conduit whose individual bend portions differ in the bend direction three-dimensionally from one another, not lying on the same plane, such as the fuel pipeline or brake pipeline of a car.
Description of the Prior Art A conventional bending machine of the foregoing t~e includes a required number of bending units disposed corresPondingly to a plurality of bend portions, each unit being configured as shown in ~ig. 12 so that with respect to each bending ~rocess, a receiving roll 21 is moved by a cylinder 22 to come into contact with a metallic conduit 23, and then a bending roll 24 is moved by a cylinder 25 to bend the me-tallic conduit 23. In the drawing, 26 and 27 are mounts, 28 and 29 are stays, and 30 is a basemen-t.
According to the foregoing conventional bending ~g ., .
1 3C~,639 ~achinel ~owever, since the bending process is carried out by moving the receiving roll 21 and the bending roll 24 b~ means of t'ne respective c~linders 22 and 25, one bending process needs two ac-tions; thus, the processing time is long. Since the bending proces~ is completed when the piston rods of both cylinders 22 and 25 are in an extended s-tate, upon sunply of a pressurized fluid into the cylinder ( generall~J, an air cylinder ) at the time of bending, the bending moment imposed on the piston rod increases, and flexure resulting from the reaction caused at the time of bending appears in the stays 28 and 29 and mounts 26 and 27 for supporting the cylinders 22 and 25; as a result, a minute discrepancy ( called ~breathing" by those skilled in the art ) appears between the receiving roll 21 and the bending roll 24, thereby resulting in variations in products. To eliminate such a discrepancy, it is necessary to make the stays 28 and 29 and the mounts 26 and 27 thick and rigid; consequently, -the machine becomes large in size and heavy ( but, in spite of such ~rovisions, some discrepancy canno-t be eliminated ). Further, since the whole machine is designed and composed while giving consideration -to the position, orientation, etc. of each o~ the cylinders 22 and 25, receiving roll 21 and bending roll 24, a long 1 3~63~
time ls needed for manuf?-c-ture, such as assembll~ and adjustmen-t; as a result, the machine cannot be put in service in time where the start of ~ass produc-tion is settled. In addition, since the nurnber of ~arts and of moving ~or-tions is large, the manufacturing cost is very high and the durabilit~ is inferior.
Es~eciall~, where one bending mechanism and a subseauent bending mechanism are to be disposed close to each other, the two mechanisms cannot be dis~osed or must be moun-ted using a com~licated mechani~m because they would in-terfere with each o-ther even partl~J.
Further, when the metallic conduit is brandished during bending, it under movement tends to interfere with the bending member.
S~~ ARY OF THE INVENTION
Therefore, it is the object of the present invention to ~rovide a bending machine ca~able of ~reventing the occurrence of interference of a metallic conduit with a bending member when the metallic conduit is brandished during bending to reach a nex~t given position, ~reventing the a~earance of a discre~ancy ( breathing ), com~letlng one bending ~rocess through one action to shorten the ~rocessin~ -time, and making it eas~ -to take out the ~ 30O639 the metallic condui-t com~letel~ bent and sha~ed9 which is small in si~e, light in weight, low in cost, and eas~
to manufacture.
To achieve the foregoing object, a small-diameter metallic conduit bending machine according to the ~resent invention com~rises a sta.tionar~ frame which is formea by connecting bar stock or ~ine stoc~ into a sha~e substan-tiall~ confor~ing to tne finished curved sha~e of a metallic conduit over the whole length; at least oreof two, first and second bending sections ~rovided in the stationary frame, the first be~ding section including a first guide surface defined by a surface which has a curvature smaller than the bend radius of -the metallic conauit in the lengthwise direction and is substantially orthogonal to the bend ~].ane of the metallic conduit in the ~Nidthwise direction, and the second bending section including a second guide surface which is defined by a surface substantially ~arallel to the bend plane and a guide member which is mounted to the stationary ~rame in a direction substantiall~ orthogonal to the second guide surface and has a curva-ture smaller -than the bend radius of the metallic conduit; a bending member which is moved by an actuator attached via a bracket to the stationary frame toward -the stationary frame from thereoutside 1 3()''~3q so tha-t the metallic conclui-t can be bent so as to lie alon~ the first guide surface in the first bending section or along the second guide surface and -the ~ide member in the second bending section; and means Eor removing the bending member from the moving area of the metallic conduit when the bending member is -to interfere with the metallic concduit which is moving as the result of the bending process of a preceding stage.
As will be a~reciated from the foregoing, the ~resent invention performs bending by the use of the stationary frame with the guide surface and the bending member which is moved from ou-tside the guide by the actuator, such as air cylinder or rotar~J actuatort at-tached to the frame via the bracket so that the metallic conduit can be bent so as to lie along the guide surface or along the guide surface and the guide member.
Therefore, since the actuator for moving the bending member is coupled -to the stationary frame by welding or the like, flexure is prevented from anpearing in a stay or the like. Since the bending process is carried out preferably when the piston rod of the air cylincler is in a pulling stroke no-t in a ~ushing stroke ( in an extended state ), in contrast to the prior art, no a~reciable bending moment is imposed on the ~iston rod 1 3~ 3q or the like at the ter~ination of each bending process, so that the influence of looseness of a bush provided for the piston rod becomes minimum; thus, any minute discre-panc!~ ( breathing ) in relation to the bending member can be prevented from a~earing.
Furthert to avoid tne situation wherein the metallic conduit, which is moving or being brandished as the result of the bendin~g ~rocess of a ~receding stage, interferes with the bending member, or wherein the bending member lies on -the bend ~lane of the preceding stage, the actuator for moving the bending member i5 rotated a certain angle via a bracket to prevent the bending member from interfering, or the bending member is previously retracted by a cylinder attached to the dis-tal end of the actuator spaced a certain distance from the bend ~lane of the frame via the bracket to prevent the bending member from interfering. '~Yhen bending the metallic conduit, the bending member is ~rojected to the bend plane to ~erform bending, and after -the com~letion of bending of the metallic conduit, the bending member is returned to its retracted ~osition; thus, the metallic conduit completed through all bending processes can be readily taken out. In addition, since the frame is readil1J formed by welding or the like and then the bendintg 1 3 '~ 3 9 member ~ inclusive o~ the actuator ) i~ dis~osed so as to face the frame, the mac~ine can be made small in size ?~d li~nt in ~7eight.
BRI3F DESCRIPTION OF THE DR~'NI~GS
Fig. 1 is a schematic persPective view showing a stationary frame used in the ~resent invention;
Fig. 2 is an enlarged sectional view taken along line II-II of Fig. l;
Fig. 3 is an enlarged sectional view taken along line III-III of Fig. l;
Figs. 4(a) and 4(b) are enlarged sectional views taken along line IV-IV and line IV'-IV', respectively, of Fig. l;
Fig. 5 is an enlarged sectional vie~,~ taken along line V-V of ~ig. l;
~ ig~ 6 is a fragmentar~ perspective view showing an embodiment of a bending machine according -to the pre3ent invention;
Fi~gs. 7(A) to 7(F~ are front views ex~lanator~ of the operation of the embodiment shown in Fig. 6;
Fig. 8 is a plen view corresponding -to Fig. 7;
Fig. 9 is a fragmentary ~erspective view showing another embodiment of the ~resent invention;
1 3C '63q ~ igs. lO(A) to lO(F) are Ir~nt views explanator~ of the operation of the embodiment shown in ~i~. 9;
ig. 11 is ~ plQn vi~w corres~ondin~ to ~ 10; ~nd Fig. 12 is a ~ers~ective view showing a conventional bending machine.
DETAI~ED DESCHIP'rION OF ~HE PREFERRED EMBODIMENTS
In Figs. 1 through 5, reference numeral 1 designates an elongate stationary frame made of bar stock, ~i~e stock ( Fig. 4(b) ), or the like in continuous form by welding 9, which substantially conforms in curved shape to a metallic conduit 2 over the whole length and has, in the vicinit~ of a bending member 5, preferably within the range of bend angle9 a first guide surface 1' defined by a surface whose widthwise direction is substantially orthogonal to a bend plane and a second guide surface 1"
defined by a surface whose widthwise direction is subs-tantially parallel to the bend plane, the sectional contour of the frame including a flat portion and preferably being made substantially quadrangular.
~owever, the sectional sha~e of the second guide surface 1" is not necessarily limited to the above, but may -take a circular shape; in -this la-tter case, the second guide surface 1" means a surface which extends in a d.irection substartial~ orthogonal to a ~lide member 3 hereinafter described and is formed b~ lines -tan~ential to the outer peri~'neral surface of the metallic conduit 2. At a given position in relation to the frame 1 effec~tive in bending the metallic conduit 2, there is disposed a guide member 3 which has a curvature smaller than the bend radius of the metallic condui-t 2 and is secured b,~J welding or the like in a direction substantially orthogonal to both the first guide surface 1' and the second guide surface 1". ~he curvature and shape of each of the first guide surface 1', second guide surface 1", guide member 3, frame 1, etc. are determined in consideration of the spring bac~ o~ the metallic conduit 2 occurrlng at the time of bending. Here, the guide member 3 may be shaned like a Plate piece as shown in Fig. 4(a) or like a block as shown in Fig. 4(b). Although the frame 1 illustrated is secured on a basement ( not shown ) b~J means of a required number of Posts 4, according to the present invention, the basement is not necessarily required if the ~osts 4 are connected together, in contrast to the prior art. 5 designates a bending member which is disposed as being able to move toward the stationary frame 1 while ~ressing the metallic condui-t 2 so as to lie along the f`irst guide surface 1' or along the second 1 3C3~)3q guide surface 1" and the guide member 3. In Fig. 2, the bending member 5 ~or ~erforming bending in coo~eration ~Nith the first guide surface 1~ is disposed so that its outer peri~heral surface faces the first guide surface 1'.
In Fig. 3, the bending member 5 for performing bendi~g in cooPeration with the second guide surface 1" and the guide member 3 is disposed so that its moving direction is substantially ~arallel to the second guide surface 1"
or intersects therewith with a slight inclination.
5' designates -the bending member before the bending process in Fig. 1.
The bending member 5 is attached to a lever 9 of ~ shape, for exam~le, which is moved b~ an actuator ( a cylinder 8a, in the embodiment ) 8 attached via a bracket -to the frame 1 ( Figs. 6 to 8 ), or is attached via an angle piece 8c to the point of a Piston rod 8b of the actuator 8 ( ~igs. 9 to 11 ). Of course, the embodiment of Figs. 9 through 11 mav use a lever for a-ttachment.
According to the prior art, as described above7 the metallic conduit 2 sometimes interferes with the bending member of a succeeding stage while the metallic conduit 2 is moving ( is being brandished ) as the result of the bending process of a preceding sta~e. The present invention avoids -the in-terference of the metallic condui-t -~ 10 --with the bending member 5 by con-igurlng the embodiments as below.
~ rnat is, in tne embodimen-t of ~igs. o through 8, one end of the lever 9 for ~oving tne bending ~ember 5 is pivoted -to one end of a beam 10, the beam 10 has a forked piece lOa at its other end and a holding piece 11 attached integrally to its central portion, the nolding piece 11 is rotatably connected via a sunport shaft 12 with a bracket 8d secured to the frame 1, and an air cylinder ( not shown ) is coupled to the bean 10; accordingly, both ends of tne beam 10 can swing verticall~ or it can rotate a certain angle, that is, the bending mernber 5 can shift a certain angle. Further, the other end of the lever 9 is pivoted to the piston rod 8b of the actuator 8 ( the drawing shows the air cylinder 8a therefor )~ and an arm piece 13a connected directly with a collar portion 13 of the cylinder 8a is fitted to the forXed piece lOa of the beam 10 and rotatably supported b~J a support shaft 14; accordingly, upon the extension/retraction action o-f the piston rod 8b, the actuator 8 itself swings la-terally to put the bending member 5 in a bendable state.
S~ecificall~, as shown in ~igs. 7 and 8, the bending nember 5 ~ivotable about the support shaft 12 is normally held in the ( shifted-down ) state A t Fig. 7(A) ) so I 3 (J '~ 9 that the ~etallic conduit 2 can~ot i~terfere :lith the bendin~ member 5 even when it is moved or bent b~J the bending ~rocess OI` the oreceding state. ~hen, vhen due to the bending ~rocess of the ~receding stage tne metallic conduit 2 comes into contact with the bending section of the stationary frame 1 ( Fig. 7(B) ), the bending member is shifted u~ward as shown in Fig. 7(B) and comes to the state C ( Fig. 7(C) ). Then, the ~i~ton rod 8b is retracted, so that the bending member changes from the state C to the ( bending ) state D ( Fig. 7(D) ) to ~erfo~Q bending. In this bending ~rocess, the actuator 8 mounted to -the frarne 1 swings laterall~ about the su~por-t shaft 14 as shown in Fig~ 8 ( from position C to D ) so that tne bending member 5 can bend the rnetallic conduit 2 so as to lie along -the first guide sur~ace 1' or along the second guide surface 1" and the guide member 3.
After the completion OI bending, the bending rnember 5 returns to the state E ~ Fig. 7(E) ), that is, the actuator 8 swings rigntward as shown in Fig. ~ ( to position E ). ~hen, the bending member is shifted down-ward and waits for a next bending ~rocess ~or another metallic conduit at ~osition F ( or in t'ne sta-te F of Fig. 7(F) ).
It should be noted that the bending member is held 1 3 r~ 3 ~
in the state D until ~ll bending stages are com~leted, hence, each bending member serves as a ~ressing/~osition-ing me~ns with respect to each succeeding bending ~rocess, thereby enhancing the accurac~ of tne bending process.
On the other hand, in the embodiment of Figs. 9 through ll, the bending member 5 is attached~-to the point of a piston rod 15a o~ a cylinder 15 se~arately provided, instead of belng connected dlrectly to the piston rod 8b.
A collar ~ortion 13 o~ the air cylinder 8a is secured to a bracket 7 attached to the stationary frame lo In thls case, the bending member 5 is normally retracted by the cylinder 15 so that the bending member 5 will not disturb the moving of the metallic conduit 2. That iS9 the air cylinder 8a is disposed while leaving a certain spaclng with respect -to the bend plane of the stationary rame 1.
~t the time o~ bending, the bending member 5 is projected by the cylinder 15 and moved to a predetermined position 50 as to lie along the -~rame 1 by the retraction action o~ the piston rod 8b.
Specifically, as shown in Figs. 10 and ll, the bending member 5 is normally held in the retracted state A ( Fig. lO(A) ) by means of the cylinder 15 so that the metallic conduit 2 cannot interfere with the bending member 5 even when i-t is bent b~ the oending process of 1 30'',~3~
a ~receding s-tage. Then, w'nen due to the bendlng ~rocess o~ the ~receding stage the metallic conduit 2 comes into contact wi-th t~e bending section of the stationary fra~e 1 as shown in Fig. lO(B), the c~Jlinder 15 is actuated to extend and ~roject the ~iston rod 15a to a ~redetermined ~osition as show~n in Fig. lO(C). Then, the piston rod 8b is retracted, so -that the bending member changes from -the state C to the ( bending ) state D ( Fig. 10(~) ) to perform bending. In this bending process, the bending member 5 bends the metallic conduit 2 so as to lie along the first guide surface 1' or along the second guide surface 1" and the guide member 3. Here, the cylinder 8a, which is attached to the ~rame 1 hereinabove7 ma~ be pivoted between the collar portion 13 and the bracket 7 so that the cylinder 8a can swing. Following the above, the bending member 5 is changed to the state E ( Fig~ 10 (E) ) b~ the extension of the piston rod 8b and then is shifted downward to the state F ( Fig. 10(~) ) b~ the retraction of the piston rod 15a. In this state F, the metallic conduit completed through all bending processes is taken out and a next bending ~rocess ~or another metallic conduit is awaited.
It should be noted that if the bending member is held in the s-tate D until all bending stages are com~leted, _ 14 -1 30",63~
each bending ~enber serves as a ~ressing,~ositioning .neans with res~ect to each succeeding bending ~rocess, the~eby e~hancing the accuracy ol the bending ~rocess.
In ~erEormlng the bending of the metallic conduit 2, first, one end of the straight metallic conduit 2 is loc~ed and secured to a loc~ member 16 dis~osed at one end of the stationar~ ~rame 1 by means of an end fixture 17 as shown in ~ig. 1 ( a first mode ), or a given ~oint of an intermediate ~ortion of the conduit that is indexed using a sto~per or the like ( not shown ) is secured by a clam~ tool ( not shown ) or the like ( a second mode )~
Then, the bending ~rocess is carried out, from the secured end side toward the free end side in the first mode, or from the secured portion toward both free ends in the second mode, by ~rogressively causing the straight or circular movement of the bending member 5 toward the frame 1 so that the metallic conduit 2 can be ~ressed so as to lie along the first guide surface 1' or along the second guide sur,ace 1" and t~e ~uide member 3 of -the frame 1. Of course, the machine of the ~resent invention can be used in bending not onl~ metallic conduit, but also bar stock. Although the actuator made of the air cylinder is illustrated in the drawing, a rotary actuator ( not shown ) ma~r be used.
1 3~ 3q As described above in greater de-tail, according to the ~resent invention, the bending process is carried out b.~ means of the stationary ~r~me 1 and the bending member ~ which is moved from outside the guide member 3 b~ the 2ctuator 8 attached to the frame 1 directly or via the ~ost 4 or bracket so that tne metallic conduit 2 can be bent so as to lie along the guide member 3 and the first guide surface 1' or secon~ guide surface 1". Therefore, since the actua-tor 8 for moving the bending member 5 is cou~led to the stationar~ frame 1, flexure is prevented from a~pearing in the stay or the like. Further, since the bending member 5 is actuated preferabl!J when -the actuator 8 is pulling its piston rod, the influence of looseness of a bush provided for the piston rod -that becomes worse when the ~iston rod is pushing or in an extended sta-te is reduced to a minimum, in contrast -to the prior art, and it is possible to nearl~ prevent the imposition of the bending moment. Therefore, it is possible to prevent an~J minute discrepanc~J ( breathing ) from appearing be-tween the bending member 5 and the guide member 3, thus to fabricate curved products of high preciseness.
Further, even if the collrse o~ bending of the metallic conduit 2 seems to interfere with the bending -13~ 39 member 5, because the machine is configured so that the bendin member is ~reviousl~ shifted or retracted and at the time of bending, it is returned or ~ro~ected to a ~redeter~ined ~osition, the bending units can be dis~osed close to each other, the setting of these units can be achieved without using an~y com~licated mechanism, the individual bending processes can be contiguously performed without troubles, and the finished metallic conduit can be readily taken out because the bending members are retracted after the com~letion of bending. ~urther, the whole bending machine is com~osed sim~ly by cutting a square bar or the like on the market to given lengths, be~ding, and welding together into a continuous sha~e so as to substantiall~ conform to the finished curved shape of the metallic conduit over the whole length, by providing the ~late-like guide members 3 at given ~ositions to comPlete the frame 1, and by disposing the bending members 5 ( inclusive of the actuators 8 ) so that the~J can move toward the frame; accordinglv, as compared with the ~rior art, the number of ~arts is remarXably decreased; hence, the machine can be made small in size, light in weigh-t, and low in cost. ~'urther, since the machine can be manufactured in a very short time, it can be surel~J pllt in serviceable state before the start of mass production.
Claims (5)
1. A small-diameter metallic conduit bending machine comprising a stationary frame which is formed by connecting bar stock or pipe stock into a shape substantially conforming to the finished curved shape of a metallic conduit over the whole length, at least one of two, first and second bending sections provided in said stationary frame, said first bending section including a first guide surface defined by a surface which has a curvature smaller than the bend radius of the metallic conduit in the lengthwise direction and is substantially orthogonal to the bend plane of the metallic conduit in the widthwise direction, and said second bending section including a second guide surface which is defined by a surface substantially parallel to the bend plane and a guide member which is mounted to said stationary frame in a direction substantially ortho-gonal to said second guide surface and has a curvature smaller than the bend radius of the metallic conduit, a bending member which is moved by an actuator attached to said stationary frame toward said stationary frame from thereoutside so that the metallic conduit can be bent so as to lie along said first guide surface in said first bending section or along said second guide surface and said guide member in said second bending section, and means for removing said bending member from the moving area of the metallic conduit when said bending member is to interfere with the metallic conduit which is moving as the result of the bending process of a preceding stage.
2. A small-diameter metallic conduit bending machine according to claim 1, wherein said removing means is made of means for rotating said actuator pivoted to said bracket attached to said stationary frame by a certain angle via a bracket.
3. A small-diameter metallic conduit bending machine according to claim 1, wherein said removing means is made of another actuator which is spaced a certain distance from the bend plane of said stationary frame and can extend said bending member attached to the point of its piston rod.
4. A small-diameter metallic conduit bending machine according to claim 1, wherein said stationary frame is composed by welding bar stock or pipe stock.
5. A small-diameter metallic conduit bending machine according to claim 1, wherein said guide member provided in said second bending section is shaped like a plate piece or a block.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26692988A JP2651711B2 (en) | 1988-10-22 | 1988-10-22 | Bending equipment for small diameter metal pipes |
| JP266,929/63 | 1988-10-22 | ||
| JP317,428/63 | 1988-12-15 | ||
| JP31742888A JP2651716B2 (en) | 1988-12-15 | 1988-12-15 | Bending equipment for small diameter metal pipes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1308639C true CA1308639C (en) | 1992-10-13 |
Family
ID=26547649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000597647A Expired - Lifetime CA1308639C (en) | 1988-10-22 | 1989-04-24 | Small-diameter metallic conduit bending machine |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4961335A (en) |
| KR (1) | KR920001597B1 (en) |
| AU (1) | AU603040B2 (en) |
| CA (1) | CA1308639C (en) |
| DE (1) | DE3920740A1 (en) |
| FR (1) | FR2638110B1 (en) |
| GB (1) | GB2224226B (en) |
| SE (1) | SE468791B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GR890100232A (en) * | 1989-04-11 | 1991-09-27 | Panagiotis Anagnostopoulos | Added flexion system for wire works for the construction of tridensional flat forms |
| AU783476B2 (en) * | 2000-11-06 | 2005-11-03 | Rightway Industry Co. Ltd | Hydraulic forming machine for metal tubes |
| CZ294987B6 (en) * | 2001-02-28 | 2005-04-13 | Msv Systems Cz S. R. O. | Bending head |
| DE10342958A1 (en) * | 2003-09-17 | 2005-04-21 | Deutz Ag | Spring unit for fuel injection pumps or gas exchange valves for IC engines has spring unit with two pressure springs located behind each other and in switched in series |
| JP5530802B2 (en) | 2010-05-13 | 2014-06-25 | 三桜工業株式会社 | Pipe bending machine |
| JP6703022B2 (en) * | 2017-03-30 | 2020-06-03 | 日本発條株式会社 | Hollow stabilizer, stabilizer manufacturing apparatus, and hollow stabilizer manufacturing method |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE383620C (en) * | 1923-10-15 | Staedtische Lehrwerkstaette Fu | Device for bending thin-walled pipes by means of bending rollers acting against a basic shape under spring action | |
| US411941A (en) * | 1889-10-01 | Mechanism foe bending metal bars | ||
| US183190A (en) * | 1876-10-10 | Improvement in machines for bending metal pipes | ||
| US641535A (en) * | 1899-02-24 | 1900-01-16 | Shook Anderson Mfg Co | Device for bending special shapes of tubes or pipes. |
| US2366012A (en) * | 1942-10-20 | 1944-12-26 | Parnall Aircraft Ltd | Appliance for bending tubes, rods, and the like |
| US2414926A (en) * | 1943-06-28 | 1947-01-28 | Boiler Engineering & Supply Co | Tube bending machine with pivoted sweep arm |
| US2964085A (en) * | 1955-12-21 | 1960-12-13 | Ghiringhelli Enrico | Equipments for bending reinforcing irons of concrete or the like |
| US3420279A (en) * | 1966-07-05 | 1969-01-07 | Mcinerney Spring & Wire Co | Secondary wire-bending machine |
| FR2332826A1 (en) * | 1975-11-28 | 1977-06-24 | Ermeto Sa | BENDING TOOL AND DEVICE EQUIPPED WITH AT LEAST ONE SUCH TOOL |
| US4249407A (en) * | 1979-04-02 | 1981-02-10 | Fogleman Boyd C | Apparatus for bending steel tubes |
| US4662204A (en) * | 1985-01-17 | 1987-05-05 | Usui Kokusai Sangyo Kabushiki Kaisha | Apparatus for automatically bending metallic tubes |
| JPH089063B2 (en) * | 1985-10-21 | 1996-01-31 | 臼井国際産業株式会社 | Bending unit device in automatic pipe bender |
| US4805436A (en) * | 1987-11-12 | 1989-02-21 | Usui Kokusai Sangyo Kabushiki Kaisha | Apparatus for bending metal tube of small diameter |
| CA1335784C (en) * | 1988-05-13 | 1995-06-06 | Sadao Kimura | Small-diameter metallic conduit bending machine |
-
1989
- 1989-04-20 US US07/341,118 patent/US4961335A/en not_active Expired - Lifetime
- 1989-04-24 CA CA000597647A patent/CA1308639C/en not_active Expired - Lifetime
- 1989-04-26 GB GB8909514A patent/GB2224226B/en not_active Expired - Lifetime
- 1989-04-27 SE SE8901540A patent/SE468791B/en not_active IP Right Cessation
- 1989-04-28 AU AU33829/89A patent/AU603040B2/en not_active Ceased
- 1989-05-02 FR FR898906026A patent/FR2638110B1/en not_active Expired - Fee Related
- 1989-05-29 KR KR1019890007148A patent/KR920001597B1/en not_active IP Right Cessation
- 1989-06-24 DE DE3920740A patent/DE3920740A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| GB2224226B (en) | 1992-09-09 |
| DE3920740C2 (en) | 1992-02-20 |
| FR2638110B1 (en) | 1994-09-16 |
| SE8901540D0 (en) | 1989-04-27 |
| AU3382989A (en) | 1990-04-26 |
| GB2224226A (en) | 1990-05-02 |
| SE468791B (en) | 1993-03-22 |
| US4961335A (en) | 1990-10-09 |
| AU603040B2 (en) | 1990-11-01 |
| DE3920740A1 (en) | 1990-04-26 |
| FR2638110A1 (en) | 1990-04-27 |
| KR920001597B1 (en) | 1992-02-20 |
| SE8901540L (en) | 1990-04-23 |
| KR900006036A (en) | 1990-05-07 |
| GB8909514D0 (en) | 1989-06-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4356716A (en) | Bending machine | |
| US7013547B2 (en) | Method and device for the production of curved spring strip sections | |
| CA1308639C (en) | Small-diameter metallic conduit bending machine | |
| US4491004A (en) | Apparatus for manufacturing a metal pipe | |
| CN101360572B (en) | Stretch-forming machine and method | |
| US4090387A (en) | Bending-tool and a device fitted out with such a tool | |
| US3438237A (en) | Apparatus for shaping metal rods | |
| CA1335784C (en) | Small-diameter metallic conduit bending machine | |
| KR20120077092A (en) | Round bender and roll forming system provided with the same | |
| US4977771A (en) | Device for bending thin metallic pipe | |
| US4938050A (en) | Small-diameter metallic conduit bending machine | |
| EP0669174B1 (en) | Machine for bending sheets of metal | |
| CN217018237U (en) | Combined bending die and bending machine | |
| EP0990471A1 (en) | Bending machine | |
| US4964290A (en) | Small-diameter metallic conduit bending machine | |
| EP1304242B1 (en) | Hollow stabilizer | |
| EP0330258B1 (en) | Apparatus for cambering a tool of a bending apparatus | |
| JP2651716B2 (en) | Bending equipment for small diameter metal pipes | |
| JP2589543B2 (en) | Bending equipment for small diameter metal pipes | |
| GB2226514A (en) | Small-diameter metal bar or conduit bending machine | |
| JP2691569B2 (en) | Bending equipment for small diameter metal pipes | |
| JP2651711B2 (en) | Bending equipment for small diameter metal pipes | |
| KR100820959B1 (en) | Pre-forming die to prevent spring back | |
| CN209773121U (en) | Lower support lifting base of stretch bending straightener | |
| JP2521760Y2 (en) | Haunch bending and rebar bending machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |