US3869926A - Device for bending serpentine struts - Google Patents

Device for bending serpentine struts Download PDF

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Publication number
US3869926A
US3869926A US398414A US39841473A US3869926A US 3869926 A US3869926 A US 3869926A US 398414 A US398414 A US 398414A US 39841473 A US39841473 A US 39841473A US 3869926 A US3869926 A US 3869926A
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United States
Prior art keywords
bending
chains
chain
pair
shafts
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
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US398414A
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English (en)
Inventor
Klaus Keller
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Individual
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Individual
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    • 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
    • B21D11/06—Bending into helical or spiral form; Forming a succession of return bends, e.g. serpentine form
    • B21D11/07—Making serpentine-shaped articles by bending essentially in one plane
    • 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
    • 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
    • B21F1/04—Undulating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18056—Rotary to or from reciprocating or oscillating

Definitions

  • This invention relates to a device for bending serpentine struts, in particular for lattice beams, from a strand material which passes through two sets of bending tools, movably journaled on chains by control elements, transversely to the travel of the material in the bending region, said chains being moved in opposing paths in said bending region.
  • a bending tool is journaled on each chain member of the employed articulated chains.
  • the division of the bending tools thus concurs with the division of the chain.
  • the joint plates are constructed as special parts for this purpose and may serve to journal and guide the bending tools. Hence, they must have a considerable size, thereby causing the chain division to be correspondingly large.
  • the present invention is based on the object of providing a device of the class described hereinbefore which is small in construction and which requires little driving energy.
  • the invention departs in principle from this conception. It solves the functional unit by reorganizing it into a chain having a small division and small members and a set ofbending tools having a substantially larger division.
  • Small sprocket wheels could consequently be pro vided as a result of employing a chain with small members, thereby reducing the size and mass of the entire device which, in turn, not only takes up less space, but also reduces the necessary driving power.
  • Considerably fewer bending tools are also required on the whole, since their number can be limited to the amount functionally necessary while the number of bending tools in the known devices was determined by the number of chain members which could not be reduced or else jerky operation had to be put up with.
  • a special advantage can be seen in the fact that commercial, even standardized structural parts can be employed for the chains and sprocket wheels and are considerably less expensive to purchase than special chains.
  • the number of bending tools expediently amounts to a fourth to a sixth, preferably a fifth, of the number of the chain members. Approximately to 25, preferably l8, bending tools may be provided per chain. This construction produces a device which is small in construction, but which nevertheless is very powerful and efficient.
  • the bending tools are journaled on lateral extensions of the chain pins of flat-link articulated chains so as to be eccentrically pivotal.
  • This 2 makes it possible to employ commercial articulated chains with laterally extended chain pins so that no journaling or guiding members have to be provided on the joint plates.
  • By correspondingly disposing the eccentrical pivot bearings relative to the bending tools it is also possible to achieve flex-free bending of the material, i.e., bending is executed in one direction of bending only.
  • the bending tools of each set are preferably disposed between parallel chain pairs and are journaled on both sides. This produces a stable mounting which can transmit large forces without requiring the bearing parts to have especially large dimensions.
  • FIG. 1 is a schematic side elevation of a device in accordance with the invention
  • FIG. 2 is a front elevation of the device according to FIG. 1;
  • FIG. 3 is a top elevation with a partial horizontal section of the device according to FIGS. 1 and 2, and
  • FIG. 4a is a side elevation
  • FIG. 4b is a top elevation of a bending tool.
  • 1 is a column mount forming the frame of the device according to the invention and comprising four verticalcolumns la-ld.
  • a first bearing unit 2 is rigidly mounted at the bottom of the column mount.
  • a frame 3 is mounted so as to be adjustable in height by means of a spindle drive 4 and is journaled so as to be clamped in a stationary position by means of clamping levers 5.
  • the frame supports a second bearing unit 6.
  • Two shafts 7a and 7b or 8a and 8b are journaled in longitudinal spaced relation in each of the bearings units 2 and 6.
  • the shafts 7b, 8b can be driven synchronously by a common motor 11 via universal joint shafts 9 and 10 and a branch gearbox 12.
  • Double chains 17, l8, l9 and 20 respectively pass about the associated pairs of double sprocket wheels 13a, 14a or 13b, 14b or 15a, 16a or 15b, 16b.
  • These double chains are designed as commercial, standardized roller chains with tab members 21 and joint pins 22 as can be seen from FIG. 3.
  • the bearings of the shafts 7b and 8b can be displaced by means of clamping devices 23 in order to tighten the chains.
  • the roller chains may be supported against sagging in the region between the sprocket wheels, the supports (not shown) abutting on the chain rollers.
  • Bending tool units generally designated with reference numeral 24 are journaled between adjacent double chains 17 and 18 or 19 and 20.
  • the bending tool units 24 are illustrated in more detail in FIGS. 4a and 4b.
  • Each unit has a mounting member 25 in which a bar-shaped bending tool 26 with a rounded head 26a is interchangeably journaled by means of a thumbscrew 27.
  • Guide rollers 28 are laterally journaled on the mounting member and their purpose shall be explained hereinbelow.
  • Each mounting member is also provided with a bearing yoke 29.
  • Extended sections 22a of chain bolts, or joint pins, 22 engage the bearing yoke 29.
  • the extended sections 22a may be formed such that chain bolts from triple chains are used at the respective locations.
  • the arrangement is created such that the chains 17 to 20 are made up of relatively small chain members, for example, 90 chain members.
  • the bending tool units 24, however, are only journaled on every fifth chain joint pin 22 so that the bending tools are arranged or are spaced at a substantially greater distance than the chain members.
  • a cam disc 30 is rotatably journaled on the shaft 7a in the plane in which the bending tool units 24 move, but is prevented from rotating by means of a stationary guide rail 31 having a run-out section 31a.
  • each cam disc 30 and each guide rail 31 consists of two identical parts which are laterally located in spaced relation. The spacing is selected such that the guide rollers 28 can respectively roll on one of the two parts.
  • a corresponding arrangement of cam discs and guide rails is provided for the bending tool units 24 of the upper pairs of double chains 19 and 20. Only one guide rail 32-corresponding to guide rail 31 is seen in FIG. 1.
  • a two-part cam disc 33 corresponding to the cam disc 30 can also be recognized in FIG. 2.
  • the inventive device operates as follows:
  • a strand material 34 for example round or flat iron bars, is removed from a storage device'(not shown) and is introduced into the inventive device in the direction of the arrow P in FIG. 1 via a set of rollers 35 which serves to straighten and, if desired, cold-stretch the strand material.
  • the material 34 arrives at the plane in which the bending tools 26 are moving.
  • each of the bending tools which is journaled on the associated pair of chains 17, 18 or 19, 20 and which moves therewith in the direction of the arrow shown in FIG. 1, is pivoted out of the position designated 26' in FIG. 1 and into the position designated 26' by the rolling action ofthe guide rollers 28 on the cam discs 30 and 33.
  • the bending tool In position 26, the bending tool just begins to engage the strand material 34. In position 26-, it has already bent one section of the strand material 34 to form a complete strut so that the strand material leaves the device as a serpentine strut 36.
  • Theplane occupied by the material in the device may be termed the bending plane.
  • the path of the bending tools from position 26 to position 26", in which the bending process has already been terminated, corresponds to half the division of the serpentine strut 36. This causes the struts of the serpentine strut 36 to be bent without any temporal overlap. Only one bending tool 26 is engaged in bending at one time.
  • the bending tools 26 are journaled and are con-. ducted during their bending process such that the strand material is always bent in one bending direction only.
  • the pivot bearings ofa mounting member are disposed (1) along the main perpendicular of the straight line connecting the center points of curvature of the bending tool head 26a, in its initial and final bending position, (2) outside the serpentine strut 36 to be formed, as well as (3) adjacent the advancing turning point.
  • the guide rails 31 or 32 After leaving the cam discs or 33, the guide rails 31 or 32 maintain the bending tools 26 for a distance in engagement with the formed serpentine strut 36 and the bending tools 26 leave the strut 36 in the region of 4 the discharge section 31a without further deforming the resultant struts.
  • second bearing unit 6 is adjusted in height by means of the spindle drive 4. In so doing, it is necessary in the illustrated embodiment to exchange the 'tools 26.
  • the bending tool units 24, however, can be designed such that is is possible to vary the height of the serpentine struts without exchanging the tools.
  • the invention is not restricted to the embodiment shown.
  • the number of chain members and of bending tools can be varied.
  • the sole decisive factor is that a fine division of the chain can be used vis-a-vis a substantially coarser division of the arrangement of the bending tools.
  • single or triple chains can be employed in place of double chains.
  • several tripping devices for example rotating cam discs or guide assemblies, can also be employed.
  • A- shiftable or shiftrotatable mounting, for exainple in guide bar slots, could also be considered in place of a pivotal mounting of thebending tools.
  • each chain pair having two rotatable link chains each comprising a number oflink members, the number of bending tools of a said set being only a fraction of thenumberof link members in a said chain, the chains of each chain pair being located in parallel side-by-side relation, each chain pair transversely and movably supporting the bending tools ofa corresponding set for movement through said bending zone, said chains of each chain pair being rotatable in planes parallel to said bending plane, the chains of each pair being spaced on opposite sides of said bending plane and having opposed side surfaces which face each other, said bending tools of each set being supported between said spaced side surfaces of the corresponding pair of chains, said chains of each pair including inwardly extended opposed joint pins each having an end carried by the corresponding chain, a said bending tool being eccentrically pivoted on said extended joint pins.
  • each said chain comprises a double chain.
  • a device including a column mount fixedly mounting a pair of vertical columns on each side of said bending plane, a frame unit spaced from said column mount and journaled on said columns and means for adjusting the height of said frame unit with respect to said columns, opposed bearing units fixed on saidcolumn mount and frame unit, two pairs of parallel shafts rotatably supported adjacent their ends by respective ones of said bearing units and corresponding to said two chain pairs, the shafts of each pair being spaced along the path of travel of said strand material, and extending transversely through said bending plane, said shaft pairs lying respectively above and below the path of saidstrand material, sprockets on said shafts for carrying said chains in closed loop orbits, whereby the serpentine strut height corresponds to the adjusted spacing of the column mount and frame unit.
  • each shaft carries sprockets spaced on opposite sides of said bending plane, said shafts having bearings carried by said bearing units outboard of said sprockets.
  • a device including motor means adjacent said shafts and universal joint shafts coupling said motor means to at least one shaft of each chain pair for rotatably driving said chain pairs in synchronism through their sprockets.
  • a device includingcam discs journaled on ones of said shafts for rotation of said one shafts with respect thereto, said one shafts being those closest to the strand material input to the device, said cam discs being spaced on opposite sides of said bending plane and inboard of said sprockets and being engageable with eccentric portions of said eccentrically pivoted bending tools for controlling pivotal motion of successively contacted bending tools in said bending zone and with respect to the joint pins carrying said bending tools, and further including guide rails fixed with respect to the axes of said shafts and extending from corresponding cam discs parallel to the bending plane and toward the outlet end of the device for determining the pivoted orientation of corresponding bending tools leaving the cam discs.
  • each bend-- ing tool comprises a substantially L-shaped unit straddling the bending plane, one leg of such L-shaped unit terminating in a rounded bending toolhead engageable with said strand material for bending same, the other leg of said .L-shaped unit ending in yoke means transversely receiving said extended joint pins from the chains on opposite sides thereof for eccentrically pivotally locating said bending toolhead with respect to said extended joint pins.
  • a device including rotatable shafts extending transversely through said bending plane and carrying axially spaced sprockets for supporting said pairs of chains, cam and guide means adjacent and between said sprockets and bending plane, said L-shaped bending tool units each including coaxial rollers on said other leg thereof and on opposite sides of said bending plane for engaging corresponding ones of said cam and guide means and thereby controlling eccentric pivoting said bending tool with respect to its supporting chain pair, said other leg with its rollers trailing said yoke means as said chains move adjacent and with said strand material, and said one leg trailing said rollers and extending away from said chains to contact said head with said strand material.
  • a device wherein the bending tools of each set each have both sides thereofjournaled on said chains of the corresponding pair.
  • the number of bending tools is a fourth to a sixth of the number of chain members and approximately 15 to 25 bending tools are provided per chain.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Wire Processing (AREA)
US398414A 1972-09-21 1973-09-18 Device for bending serpentine struts Expired - Lifetime US3869926A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2246392A DE2246392C3 (de) 1972-09-21 1972-09-21 Vorrichtung zum Biegen von Strebenschlangen

Publications (1)

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US3869926A true US3869926A (en) 1975-03-11

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ID=5856984

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Application Number Title Priority Date Filing Date
US398414A Expired - Lifetime US3869926A (en) 1972-09-21 1973-09-18 Device for bending serpentine struts

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US (1) US3869926A (enExample)
JP (1) JPS4993259A (enExample)
AT (1) AT324077B (enExample)
CA (1) CA993334A (enExample)
DE (1) DE2246392C3 (enExample)
ES (1) ES417966A1 (enExample)
FR (1) FR2200066B1 (enExample)
IT (1) IT991840B (enExample)
NL (1) NL7311771A (enExample)
SE (1) SE409422B (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102389930A (zh) * 2011-10-13 2012-03-28 无锡威华电焊机制造有限公司 钢筋桁架腹杆筋打弯成形装置
ITPN20120001A1 (it) * 2012-01-16 2013-07-17 Awm Spa Metodo e macchina per la produzione di profilati piegati continui

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2185268C2 (ru) * 2000-06-28 2002-07-20 ООО "Стакол-Инжиниринг" Способ изготовления тангенциальных расширителей и устройства для его осуществления

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2097193A (en) * 1936-11-04 1937-10-26 Emil Goetz Wire bending machine
US2649888A (en) * 1948-04-23 1953-08-25 Armco Steel Corp Mechanism for corrugating strips of material
US2777478A (en) * 1955-01-10 1957-01-15 Odin Corp Wire bending apparatus
US3064694A (en) * 1961-05-03 1962-11-20 Wire O Corp Wire forming machine
US3382695A (en) * 1965-12-10 1968-05-14 Dominion Bridge Co Ltd Web bender

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1727894A (en) * 1927-01-24 1929-09-10 Fredellia H Moyer Bar-web-bending machine
US3219066A (en) * 1962-10-02 1965-11-23 Smith William Garnett Automatic forming and welding machine
DE2058026B2 (de) * 1970-11-25 1975-10-30 Keller, Julius Georg Stefan, Dipl.- Ing., 8000 Muenchen Vorrichtung zum Biegen der Strebenschlange von Gitterträgern

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2097193A (en) * 1936-11-04 1937-10-26 Emil Goetz Wire bending machine
US2649888A (en) * 1948-04-23 1953-08-25 Armco Steel Corp Mechanism for corrugating strips of material
US2777478A (en) * 1955-01-10 1957-01-15 Odin Corp Wire bending apparatus
US3064694A (en) * 1961-05-03 1962-11-20 Wire O Corp Wire forming machine
US3382695A (en) * 1965-12-10 1968-05-14 Dominion Bridge Co Ltd Web bender

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102389930A (zh) * 2011-10-13 2012-03-28 无锡威华电焊机制造有限公司 钢筋桁架腹杆筋打弯成形装置
CN102389930B (zh) * 2011-10-13 2014-02-05 无锡威华电焊机制造有限公司 钢筋桁架腹杆筋打弯成形装置
ITPN20120001A1 (it) * 2012-01-16 2013-07-17 Awm Spa Metodo e macchina per la produzione di profilati piegati continui
EP2614901A1 (en) * 2012-01-16 2013-07-17 A.W.M. s.p.a. Method and machine for manufacturing continuous bent profiles

Also Published As

Publication number Publication date
ES417966A1 (es) 1976-02-16
DE2246392C3 (de) 1975-06-19
CA993334A (en) 1976-07-20
DE2246392B2 (de) 1974-10-24
NL7311771A (enExample) 1974-03-25
IT991840B (it) 1975-08-30
FR2200066A1 (enExample) 1974-04-19
JPS4993259A (enExample) 1974-09-05
AT324077B (de) 1975-08-11
DE2246392A1 (de) 1974-04-11
SE409422B (sv) 1979-08-20
FR2200066B1 (enExample) 1979-02-09

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