EP1584385B1 - Outil de pliage pour des pièces, notamment tôles, ainsi que machine de pliage avec un tel outil de pliage - Google Patents

Outil de pliage pour des pièces, notamment tôles, ainsi que machine de pliage avec un tel outil de pliage Download PDF

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Publication number
EP1584385B1
EP1584385B1 EP04008272A EP04008272A EP1584385B1 EP 1584385 B1 EP1584385 B1 EP 1584385B1 EP 04008272 A EP04008272 A EP 04008272A EP 04008272 A EP04008272 A EP 04008272A EP 1584385 B1 EP1584385 B1 EP 1584385B1
Authority
EP
European Patent Office
Prior art keywords
bending
workpiece
motion
tool
coupled
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
Application number
EP04008272A
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German (de)
English (en)
Other versions
EP1584385A1 (fr
Inventor
Glenn Fielder
Ivo Karrasch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Trumpf Maschinen Austria GmbH and Co KG
Original Assignee
Trumpf Maschinen Austria GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Trumpf Maschinen Austria GmbH and Co KG filed Critical Trumpf Maschinen Austria GmbH and Co KG
Priority to AT04008272T priority Critical patent/ATE370806T1/de
Priority to EP04008272A priority patent/EP1584385B1/fr
Priority to DE502004004723T priority patent/DE502004004723D1/de
Priority to US11/099,867 priority patent/US7237419B2/en
Publication of EP1584385A1 publication Critical patent/EP1584385A1/fr
Application granted granted Critical
Publication of EP1584385B1 publication Critical patent/EP1584385B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work

Definitions

  • the invention relates to a bending tool for bending workpieces, in particular sheets, along a bending line, with at least one arranged on one side of a workpiece bending member and at least one holding device which has on opposite sides of the workpiece in the workpiece transverse direction holding members, by means of which under relative movement the mutual holding members in the workpiece transverse direction, the workpiece is fixed to the holding device, wherein the holding device with the workpiece fixed thereto and a bending member on the other hand under bending the workpiece with a working movement relative to each other are movable and the working movement of a component in a workpiece transverse direction extending stroke direction and a Component has in a transversely to the plane defined by the direction of the bending line and the stroke direction plane extending transverse stroke direction and wherein for directional control of Schwabewegun g a motion control is provided with at least a motion associated with a bending member control in the form of a backdrop and with at least one provided on the bending member associated workpiece side control in the
  • a bending tool and a bending machine are also known from JP 59 033032 A ,
  • the bending tool disclosed in this publication comprises a tool top arranged above a workpiece to be machined, and a tool bottom arranged below the workpiece to be machined.
  • the tool upper part comprises a spring-mounted in the workpiece transverse direction in the initial state holding plate and laterally next to this a punch.
  • the bending punch is mounted pivotably about a pivot axis running parallel to the bending line of the workpiece bend to be created and provided with a control surface inclined towards the workpiece transverse direction.
  • the lower tool part consists essentially of one of the retaining plate of the Tool upper part opposite support block and a laterally spaced from this control block.
  • the control block also has an inclined control surface on its side facing the bending punch of the tool upper part.
  • a sheet to be processed is placed on the support block of the lower tool part.
  • the tool upper part is lowered in the workpiece transverse direction to the lower tool part.
  • the holding plate of the upper tool part runs on the sheet metal surface facing it.
  • the sheet is now clamped between the holding plate of the upper tool part and the support block of the lower tool part.
  • the bending punch acts with a forming edge on the laterally opposite the holding plate of the upper die and the support block of the lower die part projecting sheet edge.
  • the control surface of the punch comes to rest against the control surface on the control block of the lower die part.
  • the mutual control surfaces effect a pivoting movement of the lowering punch around its pivot axis.
  • EP 0 610 706 A1 discloses a bending machine with a bending tool, which comprises an anvil-shaped tool lower part and a tool upper part with a bending member.
  • the bending member forms a leg of an angle lever which is pivotally mounted on the upper tool part.
  • the pivot axis of the angle lever and thus also of the bending element runs parallel to the bending line of a sheet to be created on a bend. If the tool upper part carries out a working stroke in the direction of the workpiece to be reshaped, the angle lever with its second leg runs against a stop on the workpiece side.
  • the object of the invention is to provide a structurally simplified and compact bending tool and a bending machine provided with such a bending tool.
  • the controls for directional control of the working movement between the workpiece to be machined on the one hand and a bending member provided for workpiece machining on the other hand are arranged on one and the same side of the workpiece.
  • the overall arrangement has a compact design.
  • the feature also has an effect, according to which the holding device with the workpiece and a control device assigned to the holding device is moved in the lifting direction relative to a bending member and a control connected thereto in the said working movement.
  • To generate the working movement is resorted to a movement axis of the holding device, which is also used to set the workpiece to be machined on the holding device. Accordingly, there is no provision for constructive measures for generating a movement of a bending member relative to the workpiece to be machined.
  • the bending tool according to the invention has a tool base, on which at least one bending member and a motion-connected linkage are supported in the stroke direction and against the side of a similar holding member and a movement associated link guide are movable in the stroke direction.
  • leadership of the holding member and the movement associated link guide on the tool base ensures defined conditions in the movement of said tool components relative to the tool base.
  • a gas spring With a gas spring according to the invention, a machine element is provided, regardless of a relatively Small construction volume is able to act on the workpiece with great force in the direction of or arranged on the opposite side of the workpiece holding members and thereby exert a very high clamping force on the workpiece.
  • a side-equal holding member and a movement associated therewith link guide are provided as parts of a unit. Due to the structural design of said holding member and the associated slotted guide, the bending tool according to the invention can be assembled and disassembled in a simple manner. For example, with appropriate structural design, the retaining member and the associated slotted guide in case of need can be removed jointly from the tool base. The bending member and its control are therefore accessible with little effort.
  • the support of at least one bending member and a motion-connected linkage on the tool base in position is adjustable.
  • assembly and / or manufacturing tolerances on the bending tool can be compensated.
  • the adjustability of the bending member in cases where a plurality of bending tools according to the invention are arranged side by side and operated jointly. By appropriate adjustment, the bending elements of the individual bending tools can be positioned as needed to each other.
  • Claim 8 describes a preferred measure according to the invention for the realization of an adjustable support of bending member and thus motion-connected link to the tool base.
  • a bending member is designed as a pivot lever which is supported on the tool base in the stroke direction and movable by means of a pivot bearing in Hubquerides (claim 9).
  • Claim 11 relates to a preferred bending machine design according to the invention.
  • At least one inventive bending tool is arranged in the tool holders of the machine base unit of a conventional press brake.
  • One of the tool holders is provided with at least one bending member, at least one side-holding member and at least one of the bending member associated link and at least one side-equal holding member associated link guide.
  • the tool holder on the opposite side of the workpiece supports at least one holding member of the holding device.
  • the required relative to the workpiece machining relative movement of the workpiece fixed on the holding device on the one hand and at least one bending member on the other hand is generated by the usual relative movement of the tool holders on the press brake.
  • conventional bending tools can be loaded into the tool holders of the machine base unit become. Multiple use of the machine base unit is therefore possible.
  • a bending machine 1 as machine base unit 2 has the machine base unit of a conventional press brake and also a processing unit 3.
  • the machine base unit 2 comprises a machine frame 4 and a press beam 5.
  • the machine frame 4 forms a support table 6 with a lower tool holder 7.
  • the press beam 5 is movably guided on the machine frame 4 in a stroke direction 8 and in a return stroke direction 9. Hydraulic piston-cylinder arrangements 10 serve to drive the press beam 5.
  • the press beam 5 is provided with an upper tool receptacle 11 on its side facing the support table 6.
  • the tool holders 7, 11 of the bending machine 1 but store the processing unit 3, which is shown in Fig. 1 of a total of four bending tools 12 assembled.
  • the bending tools 12 are strung together along a dash-dotted lines in Fig. 1 indicated bending line 13 without gaps.
  • Each of the bending tools 12 comprises an upper tool in the form of a hold-down 14 and a lower tool 15, which in turn has a tool base 16 and an upper part 17.
  • the hold-downs 14 of the bending tools 12 are mounted in the upper tool holder 11 of the press bar 5, the lower tools 15 in the lower tool holder 7 of the support table 6.
  • the hold-down 14 of the bending tools 12 in the lower tool holder 7 and the lower tools 15, then be mounted as upper tools in the upper tool holder 11.
  • the hold-down 14 of a bending tool 12 extends with an overhang relative to the vertical.
  • the hold-down 14 has a fastening lug 18 with which it is held in the upper tool holder 11 on the pressing bar 5 of the bending machine 1.
  • the contact surface 19 merges into a side surface of the hold-down 14.
  • each bending tool 12 rests with the tool base 16 on the support table 6 on the machine frame 4 of the bending machine 1.
  • a projection 21 projecting on the tool base 16 engages in the lower tool holder 7 of the support table 6.
  • the tool base 16 engages behind the support table 6 laterally with a holding projection 22.
  • the nose 21 the tool base 16 is clamped in the lower tool holder 7.
  • a bending member in the form of a pivoting lever 23 is supported on the tool base 16.
  • a bearing block 24 on which the pivot lever 23 is pivotally mounted about a pivot pin 26 formed by a pivot pin 26.
  • the bearing block 24 is in turn pivotally supported on the tool base 16 about a pivot axis 27.
  • an adjusting screw 28 for adjusting the position of the bearing block 24. In the respectively set position of the bearing block 24 is fixed by means of a locking screw 29.
  • the tool base 16 has receptacles 31, 32 for guide columns 33, 34 and a receptacle 35 for a gas pressure spring 36.
  • the guide columns 33, 34 engage in receptacles 37, 38 on the upper part 17 of the lower tool 15 a.
  • a receptacle 39 is provided on the upper part 17 of the lower tool 15.
  • the receptacle 39 for the gas spring 36 is located on the upper part 17 of the lower tool 15 below a groove 40.
  • the groove 40 receives a support body 41 of a workpiece support 42 of the upper part 17.
  • Manually operable fasteners 43 hold the support body 41 in the groove 40th
  • the pivot lever 23 passes through the upper part 17 of the lower tool 15 at a penetration 44. Within the penetration 44, the pivoting lever 23 is pivotable about the pivot axis 26 over a limited pivoting angle and thereby movable in the lifting transverse direction, ie perpendicular to the plane, from the direction of the bending line 13 and the stroke direction 8 and the return stroke 9 is clamped.
  • Formed on the pivot lever 23 is designed as a gate 46 control.
  • the gate 46 on the pivoting lever 23 is assigned to the upper part 17 of the lower tool 15 also serving as a control link guide, which in turn is formed by a control roller 47 and a control pin 50.
  • the control roller 47 is rotatably mounted about a rotation axis 48 on a base body 49 of the upper part 17. On the main body 49 of the upper part 17 and the control pin 50 is mounted, which engages in a guide slot 51 on the pivot lever 23. In an enlarged view, the structural details of the pivot lever 23 Fig. 8 can be seen.
  • the pressing beam 5 is raised so far relative to the support table 6 of the bending machine 1 that results in a gap between the free end of the mounted on the press bar 5 blank holder 14 and the upper part 17 of the lower tool 15, in detail the workpiece support 42 , In this space, the flat plate 52 is to be inserted.
  • the insertion depth determines the later position of the bend.
  • the flat plate 52 is mounted on the workpiece support 42.
  • the hold-down 14 of the bending tool 12 runs on the top side of the sheet 52 facing it and the results in the Fign. 2, 4 and 7 shown ratios.
  • the upper part 17 of the lower tool 15 is in the stroke direction 8 and in the return stroke 9 in its starting position relative to the tool base 16.
  • the upper part 17 is spaced from the tool base 16 in the mentioned direction.
  • the pivot lever 23 is aligned approximately vertically.
  • the plate 52 is clamped between the blank holder 14 and the workpiece support 42 on the upper part 17 of the lower tool 15 with little force.
  • the gas-pressure spring 36 exerts a comparatively large counterforce.
  • the clamping of the plate 52 between the hold-down 14 and the workpiece support 42 of the lower part 14 lowering upper part 17 of the lower tool 15 is reinforced.
  • the hold-down 14 and the workpiece support 42 accordingly assume the function of holding members for fixing the plate 52nd Increases the force exerted on the plate 52 holding force even by a friction-increasing coating of the sheet 52 overlapping surface of the support body 41 of the workpiece support 42nd
  • the position of the support of the pivot lever 23 to the tool base 16 can change.
  • the locking screw 29 is to be solved on the bearing block 24.
  • the pivotal position of the bearing block 24 with respect to the pivot axis 27 and thus the position of the pivot axis 26 of the pivot lever 23 can be changed.
  • the bearing block 24 is then to be fixed again by means of the locking screw 29.
  • the adjusting mechanism of the bearing block 24 on the bending tool 12 in befindaji in installation upper part 17 of the lower tool 15 is accessible.
  • the fastening elements 43 are to be solved, by means of which the support body 41 of the workpiece support 42 is fixed in the groove 40. If subsequently the support body 41 is removed from the groove 40, the attachment of the gas pressure spring 36 to the upper part 17 is accessible. After loosening this attachment, the upper part 17 can be removed as a unit from the tool base 16. The control pin 50 on the upper part 17 can thereby exit from the guide slot 51 of the pivot lever 23 through the mouth lying in the direction of withdrawal. Accordingly, the assembly of the upper part 17 on the tool base 16 of the lower tool 15 is simple.
  • the existing pivoting lever 23 can be exchanged with link 46 against another pivot lever link unit.
  • a changed link geometry requires a change of the maximum bend angle that can be realized with the respective pivot lever.
  • an adjustment of the bending tool 12 can be made to changed thicknesses and workpiece materials by using a backdrop with modified backdrop geometry.
  • pivot lever 23 shown in the figures against a pivot lever with a 13 wider in the direction of the bending line pivot lever tip.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Claims (11)

  1. Outil de pliage pour plier des pièces, notamment des tôles (52), le long d'une ligne de pliage (13), avec au moins un organe de pliage (23) disposé sur un côté d'une pièce ainsi qu'avec au moins un dispositif de retenue qui présente des organes de retenue (14, 42) sur des côtés de la pièce mutuellement opposés dans le sens transversal de la pièce, organes au moyen desquels la pièce peut être immobilisée sur le dispositif de retenue par un mouvement relatif des organes de retenue (14, 42) des deux côtés dans le sens transversal de la pièce, sachant que le dispositif de retenue avec la pièce immobilisée sur ce dernier d'une part et un organe de pliage (23) d'autre part peuvent être déplacés l'un par rapport à l'autre en un mouvement de travail qui plie la pièce, et que le mouvement de travail possède une composante dans une direction de course (8) s'étendant dans le sens transversal de la pièce ainsi qu'une composante dans une direction de course transversale s'étendant transversalement au plan sous-tendu par la direction de la ligne de pliage (13) et la direction de course (8), et sachant qu'afin de commander la direction du mouvement de travail, il est prévu une commande de mouvement avec au moins un élément de commande lié en déplacement à un organe de pliage (23) et se présentant sous la forme d'une coulisse (46) ainsi qu'avec au moins un élément de commande prévu sur le côté de la pièce associé à l'organe de pliage (23) et se présentant sous la forme d'un guide de coulisse (47, 50) qui est lié en déplacement à un organe de retenue collatéral (42), disposé sur le même côté de la pièce, du dispositif de retenue, caractérisé en ce que le guide de coulisse (47, 50) lié en déplacement à l'organe de retenue collatéral (42) du dispositif de retenue est formé par un galet de commande (47) sur un côté et par un tenon de commande (50) sur l'autre côté de la coulisse (46) liée en déplacement à l'organe de pliage (23), et en ce que, lors du mouvement de travail, l'organe de retenue collatéral (42) du dispositif de retenue peut être déplacé par rapport à l'organe de pliage (23) soutenu stationnairement dans la direction de course (8) et, ce faisant, le galet de commande (47) ainsi que le tenon de commande (50) peuvent être déplacés par rapport à la coulisse (46) dans la direction de course (8).
  2. Outil de pliage selon la revendication 1, caractérisé en ce qu'un organe de pliage (23) et une coulisse (46) qui lui est liée en déplacement sont soutenus sur une base d'outil (16) dans la direction de course (8), et en ce que le dispositif de retenue avec un organe de retenue collatéral (42) et un guide de coulisse (47, 50) qui lui est lié en déplacement peut être déplacé dans la direction de course (8) par rapport à l'organe de pliage (23) soutenu sur la base d'outil (16) et la coulisse (46) qui lui est liée en déplacement.
  3. Outil de pliage selon l'une des revendications précédentes, caractérisé en ce qu'un organe de retenue collatéral (42) et un guide de coulisse (47, 50) qui lui est lié en déplacement sont guidés dans la direction de course (8) sur la base d'outil (16).
  4. Outil de pliage selon l'une des revendications précédentes, caractérisé en ce qu'un organe de retenue collatéral (42) soutient la pièce dans la direction de course (8) et est, conjointement avec un guide de coulisse (47, 50) lié en déplacement, soutenu sur la base d'outil (16) à déplacement dans la direction de course (8) au moyen d'un dispositif pour produire une force de rappel, et en ce que la pièce est sollicitée sur le côté opposé dans la direction de course (8) au moyen d'au moins un organe de retenue (14) du dispositif de retenue.
  5. Outil de pliage selon l'une des revendications précédentes, caractérisé en ce qu'un ressort à gaz (36) est prévu comme dispositif pour produire une force de rappel.
  6. Outil de pliage selon l'une des revendications précédentes, caractérisé en ce qu'un organe de retenue collatéral (42) et un guide de coulisse (47, 50) qui lui est lié en déplacement sont prévus sous la forme d'une unité de construction.
  7. Outil de pliage selon l'une des revendications précédentes, caractérisé en ce que le soutien sur la base d'outil (16) d'un organe de pliage (23) et d'une coulisse (46) qui lui est liée en déplacement est de position réglable.
  8. Outil de pliage selon l'une des revendications précédentes, caractérisé en ce que le soutien sur la base d'outil (16) d'un organe de pliage (23) et d'une coulisse (46) qui lui est liée en déplacement comprend un bloc de support (24) qui soutient l'organe de pliage (23) et la coulisse (46) qui lui est liée en déplacement et qui est installé sur un corps de base de la base d'outil (16) en étant de position réglable.
  9. Outil de pliage selon l'une des revendications précédentes, caractérisé en ce qu'un organe de pliage (23) est réalisé sous forme de levier pivotant qui est soutenu sur la base d'outil (16) dans la direction de course (8) en une unité de construction avec une coulisse (46) qui lui est liée en déplacement, et qui est monté à déplacement dans la direction de course transversale au moyen d'un palier de pivotement dont l'axe de pivotement (27) s'étend dans la direction de la ligne de pliage (13).
  10. Machine de pliage avec au moins un outil de pliage (12) selon l'une des revendications précédentes.
  11. Machine de pliage selon la revendication 10, avec une unité de base de machine (2) ainsi que des porte-outils (7, 11) prévus sur celle ci de part et d'autre d'une pièce à usiner, caractérisée en ce qu'il est prévu comme unité de base de machine (2) l'unité de base de machine (2) d'une presse plieuse, avec des porte-outils (7, 11) pouvant être déplacés de manière commandée l'un par rapport à l'autre dans le sens transversal de la pièce à usiner, et en ce qu'au moins un organe de pliage (23) avec au moins une coulisse (46) qui lui est liée en déplacement ainsi qu'au moins un organe de retenue collatéral (42) avec au moins un guide de coulisse (47, 50) qui lui est lié en déplacement sont disposés dans le porte-outil (7) sur un côté de la pièce, et au moins un organe de retenue (14) est disposé dans le porte-outil (11) sur l'autre côté de la pièce.
EP04008272A 2004-04-06 2004-04-06 Outil de pliage pour des pièces, notamment tôles, ainsi que machine de pliage avec un tel outil de pliage Expired - Lifetime EP1584385B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT04008272T ATE370806T1 (de) 2004-04-06 2004-04-06 Biegewerkzeug zum biegen von werkstücken, insbesondere von blechen sowie biegemaschine mit einem derartigen biegewerkzeug
EP04008272A EP1584385B1 (fr) 2004-04-06 2004-04-06 Outil de pliage pour des pièces, notamment tôles, ainsi que machine de pliage avec un tel outil de pliage
DE502004004723T DE502004004723D1 (de) 2004-04-06 2004-04-06 Biegewerkzeug zum Biegen von Werkstücken, insbesondere von Blechen sowie Biegemaschine mit einem derartigen Biegewerkzeug
US11/099,867 US7237419B2 (en) 2004-04-06 2005-04-05 Bending machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04008272A EP1584385B1 (fr) 2004-04-06 2004-04-06 Outil de pliage pour des pièces, notamment tôles, ainsi que machine de pliage avec un tel outil de pliage

Publications (2)

Publication Number Publication Date
EP1584385A1 EP1584385A1 (fr) 2005-10-12
EP1584385B1 true EP1584385B1 (fr) 2007-08-22

Family

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Application Number Title Priority Date Filing Date
EP04008272A Expired - Lifetime EP1584385B1 (fr) 2004-04-06 2004-04-06 Outil de pliage pour des pièces, notamment tôles, ainsi que machine de pliage avec un tel outil de pliage

Country Status (4)

Country Link
US (1) US7237419B2 (fr)
EP (1) EP1584385B1 (fr)
AT (1) ATE370806T1 (fr)
DE (1) DE502004004723D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016118175B4 (de) 2016-09-26 2018-08-23 Trumpf Werkzeugmaschinen Gmbh & Co. Kg Werkzeugmaschine und Verfahren zum Bearbeiten von plattenförmigen Werkstücken
CN109262267B (zh) * 2018-09-29 2023-07-28 青岛先楚能源发展集团有限公司 核电站换料水池水中折弯设备
IT201900009657A1 (it) * 2019-06-20 2020-12-20 Dallan Spa Macchina piegatrice per lamiere e metodo di piegatura di lamiere
CN112808804B (zh) * 2019-11-18 2024-11-22 江苏畅通车业发展有限公司 一种外板件两端半圆耳折弯工装

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2523483B1 (fr) * 1982-03-19 1985-09-27 Pauzin Alexis Outil de pliage a plat
JPS5933032A (ja) * 1982-08-16 1984-02-22 Hitachi Ltd 薄板の折り曲げ金型
JPH05261441A (ja) * 1992-03-17 1993-10-12 Amada Co Ltd 板材曲げ型装置
JPH0631342A (ja) * 1992-07-14 1994-02-08 Amada Co Ltd 板材曲げ型装置
IT1265553B1 (it) * 1993-02-08 1996-11-22 Sipa Spa Procedimento e macchina perfezionati di presso-piegatura
IT1278355B1 (it) * 1995-02-06 1997-11-20 Sapim Amada Spa Attrezzatura piegatrice per lamiere.
JP2002316223A (ja) * 2001-04-18 2002-10-29 Umix Co Ltd プレス装置

Also Published As

Publication number Publication date
DE502004004723D1 (de) 2007-10-04
ATE370806T1 (de) 2007-09-15
EP1584385A1 (fr) 2005-10-12
US20050217342A1 (en) 2005-10-06
US7237419B2 (en) 2007-07-03

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