EP0916424A2 - Verfahren und Vorrichtung zum Reparieren von Metallplatten - Google Patents

Verfahren und Vorrichtung zum Reparieren von Metallplatten Download PDF

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Publication number
EP0916424A2
EP0916424A2 EP98120940A EP98120940A EP0916424A2 EP 0916424 A2 EP0916424 A2 EP 0916424A2 EP 98120940 A EP98120940 A EP 98120940A EP 98120940 A EP98120940 A EP 98120940A EP 0916424 A2 EP0916424 A2 EP 0916424A2
Authority
EP
European Patent Office
Prior art keywords
bar
sheet metal
repaired
bolts
steel rods
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.)
Withdrawn
Application number
EP98120940A
Other languages
English (en)
French (fr)
Other versions
EP0916424A3 (de
Inventor
Hideo c/o K.K. Tokyo Engineering Sunaga
Yoshitake c/o K. K. SANGORO Fukushima
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.)
Sangoro KK
Tokyo Engineering KK
Original Assignee
Sangoro KK
Tokyo Engineering KK
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 Sangoro KK, Tokyo Engineering KK filed Critical Sangoro KK
Publication of EP0916424A2 publication Critical patent/EP0916424A2/de
Publication of EP0916424A3 publication Critical patent/EP0916424A3/de
Withdrawn legal-status Critical Current

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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
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/06—Removing local distortions

Definitions

  • This invention relates to a sheet metal repairing method and a sheet metal working tool for repairing mainly the body of an automobile. More particularly, this invention relates to a sheet metal repairing method and a sheet metal working tool for easily and suitably pulling out a dent portion in a sheet metal such as the body of an automobile.
  • the car body is usually repaired in such a manner that a dent portion in the car body is pounded out from the back of the body panel or pulled out from the outside of the body panel.
  • the repairing method for pounding out the dent portion from the inside of the car body disadvantageously calls for a work of removing upholstery in the automobile before being carried out. This work of removing the upholstery takes much time and labor and proves to be troublesome. Therefore, the repairing method of pulling out the dent portion from the outside of the car body is widespread in general.
  • a sheet metal working puller having a long base which is provided at its both ends with slidable support legs and at its substantially middle portion between the support legs with pulling members.
  • To the base there is pivotally connected handles provided at their substantial center with a screw spindle piercing through the base and having hinged nut and ring through which the screw spindle is connected to the respective handles.
  • the contact ends of the support legs are brought into contact with the sheet metal surface to be repaired upon adjusting the space between the support legs, and then, the screw spindle is joined at its one end to a catch member welded to the sheet metal surface upon adjusting the length of the screw spindle. Thereafter, the handles are rotated to move the screw spindle upward, thereby to pull out the dent portion.
  • the version of the conventional puller as noted above requires a worker to adjust the space between the support legs and the length of the screw spindle, press the support legs on the car body, and join the screw spindle to the portion to be repaired of the car body while keeping the support legs in the state pressed against the car body.
  • This turns out to be a very troublesome chore.
  • the conventional puller is disadvantageous in that the work of holding the end portions of the handles, which are distant from the center of gravity of the puller for positioning the puller relative to the car body imposes a burden on the worker.
  • An object of this invention is to provide a sheet metal repairing method for easily and suitably pulling out a dent portion in a sheet metal by a small pulling force, and a sheet metal working tool simple in structure for use in performing the repairing method.
  • a sheet metal repairing method which comprises locating a bar above a portion to be repaired of a sheet metal, permitting a prescribed number of steel rods each having an engaging portion to be engaged to or inserted through the bar, welding the leading ends of the steel rods to the portion to be repaired of the sheet metal, and drawing the bar by using a drive means separately installed to pull up the steel rods, thereby to pull out the portion to be repaired of the sheet metal.
  • the present invention provides a sheet metal repairing method which comprises locating a bar above a portion to be repaired of a sheet metal, welding a prescribed number of welding members to the portion to be repaired of the sheet metal, uniting the welding members to the leading ends of steel rods, and drawing the bar by using a drive means separately installed to pull up the steel rods together with the portion to be repaired of the sheet metal through the welding members.
  • the present invention provides a sheet metal working tool comprising a bar having a plurality of insertion holes bored therein, and steel rods to be inserted through the bar, wherein the bar has a hook member for being pulled, and each of the steel rods has an engaging portion to be engaged to the periphery of the insertion hole in the bar.
  • the present invention provides a sheet metal working tool which comprises a bar having a plurality of insertion holes bored therein, and steel rods to be inserted through the insertion holes in the bar, wherein the bar has a hook member for being pulled, and each of the steel rods has an engaging portion to be engaged to the bar.
  • the present invention provides a sheet metal repairing method which comprises locating a bar above a portion to be repaired of a sheet metal, inserting a prescribed number of bolts through the bar, welding the leading ends of the bolts to the portion to be repaired of the sheet metal, screwing nuts to the bolts, and rotating the nuts to draw up the bolts together with the portion to be repaired of the sheet metal.
  • the present invention provides a sheet metal working tool comprises a bar having a plurality of insertion holes bored therein, bolts to be inserted through the insertion holes in the bar, and nuts screwed to the bolts.
  • Reference numeral 1 denotes a sheet metal working tool which comprises a bar 2 and steel rods 3.
  • the bar 2 is formed in a long square pillar with front and rear walls each having a plurality of inserting holes 4 longitudinally arranged at regular intervals.
  • a ring 5 serving as an insulator is fitted into each insertion hole 4.
  • the insertion hole 4 may preferably be made long in width, so that the steel rod 3 can be set at a desired position in the insertion hole 4, and further, the space between the adjoining steel rods 3 can be adjusted.
  • a hook member 7 such as a chain block for holding a chain 6 to be connected to a drive means (not shown) in order to pull up the bar 4.
  • the steel rod 3 is provided on its base with an engaging portion 8 to be engaged to the periphery of the insertion hole 4.
  • the engaging portion 8 may be formed integrally or fixedly on one end of the steel rod 3, or the engaging portion 8 may be separated from the steel rod 3 so as to be located at a desired position of the steel rod 3 relative to the longitudinal direction. Fundamentally, it is optional to form the steel rod 3 of a round bar, square bar, pipe or the like. Further, the steel rod may be fixedly provided at its one end with the engaging portion 8 which is larger in diameter than the insertion hole 4 or made long. If need arises, a holding member 17 may be placed between the bar 2 and the engaging member 8.
  • the engaging member 8 may be formed of the holding member 17 and a nut.
  • the holding member 17 may be secured astride the bar 2 and provided with a through hole 171 for permitting the bar 2 to pass freely therethrough.
  • the bar 2 is first positioned above the dent portion 101, the steel rods 3 are inserted through the insertion holes 4 on the both end portions of the bar, and then, the leading ends of the steel rods are welded to the frame body or other solid portions of the car body 100 by arc welding or the like to steadily hold the bar.
  • the prescribed number of the steel rods 3 corresponding to the size of the dent portion 101 are inserted through the intermediate insertion holes 4, and then, the leading ends of the steel rods are welded to the car body 100 by arc welding or the like.
  • the length of the steel rod 3 projected to the deeper part of the dent portion 101 is different from that of the steel rod 3 projected to the shallower part of the dent portion 101 as a matter of course, as shown in FIG. 1.
  • the drive means such as a motor is operated to pull the bar 2.
  • the bar 2 is first pulled, and then, the steel rods 3 welded to the dent portion 101 are pulled in the order from the rod protruding largely by the lengths equivalent to the depths at which the steel rods are placed.
  • the entire dent portion 101 is evenly pulled up to be made flat as shown in FIG. 3.
  • the steel rods 3 welded to the bar are separated by use of a tool or by being rotated without use of any tool, and then, pulled out of the bar 2. It does not matter if the dent portion 101 is completely made flat. The dent part resultantly left may be pulled out by use of any other tool.
  • steel rods 3 having different lengths may be used.
  • FIG. 6 shows another embodiment making use of modified steel rods 3.
  • Each of the steel rods 3 has a base with an engaging portion 9 to be engaged to the bar 2.
  • An insertion hole in the bar as seen in the foregoing embodiment is not absolutely necessary to this embodiment. Instead, a structure shown in FIG. 7 may be adopted as one example.
  • the bar 2 should not necessarily be formed in a cylindrical shape, but may be formed in a plate or stick.
  • the steel rod 3 may preferably be formed in a cylindrical shape capable of stably supporting the rod at two points.
  • FIGS. 8, 9 and 10 illustrates another embodiment of the present invention.
  • the sheet metal working tool 1 comprises a long bar 12 having a prism-like cylindrical shape and a plurality of through holes 14, bolts 13 to be inserted through the holes bored in the bar 12, and nuts 15 to be screwed on the bolts 13.
  • the bolts 13 are welded at their tip ends to the dent portion 101 in the car body 100, and the nuts 15 are screwed on the other ends of the bolts 13. By rotating the nuts, the bolts 13 are pulled out together with the dent portion 101 through the bar 12, thereby to make the dent portion 101 substantially flat.
  • the bolts 13 are welded to the car body 100 at the positions opposed to the both ends of the bar 12, and inserted through the through holes 14 in the bar, or otherwise, placed on the bolts 13.
  • the bolts for supporting the bar 12 is provided with retaining members such as nuts 23 for being prevented from moving forward.
  • the bolts 13 welded to the dent portion 101 remain unmoved, but the nuts 15 move forward to push the bar 12 forward by means of the holding member 17.
  • the bolts 13 are pulled out, consequently to pull out the dent portion 101 to which the bolts are welded.
  • the dent portion 101 is large, it is pulled out little by little at some points at regular intervals.
  • the small dent portion is pulled out at one or two points.
  • the holding member 17 into which a pin 16 is inserted in order for preventing the bolt 13 from rotating is required to be detachably attached to the position opposite to the insertion hole 14 in the bar 12 as shown in FIG. 13. Furthermore, the bolt 13 must be prevented from rotating by forming a fitting groove 18 for admitting the aforesaid pin 16.
  • the holding member 17 is released from the bar and rotated to wrench the welded part of the bolt 13 out of the car body.
  • the space retaining member 20 may be formed of a resin block 22 slidably attached to the bar 2 or 12 as illustrated in FIG. 13 as an example. Further, a magnet 21 may be used in place of the bolt 13 to magnetically secure the bar 12 to the car body 100 as shown in FIG. 14.
  • a prescribed number of welding members 30 such as washers may be formed at the leading end portion of the steel rod 3 or bolt 13.
  • a support member 31 disposed at the leading end of the steel rod 3 or bolt 13 may be formed in a bifurcated shape so that the welding members 30 are supported by an axle 32 detachably inserted through the bifurcated support member 31.
  • the axle 32 may be supported at one end of the support member 31 formed in a hook shape like a cantilever, so that the welding members 30 are supported by the axle 32. It is desirable that the support member 31 is detachably screwed on the steel rod 3 so as to be removed.
  • the desired number of the welding members 30 are welded to the dent portion 101 at arbitrary intervals by conventionally known electric welding.
  • the bifurcated support member 31 is held 50 as to accommodate the welding members 30 therein, and the axle 32 is inserted through holes in the support member 31 and holes of the welding members 30.
  • the axle 32 is inserted into the welding members 30, the welding members 30 may not necessarily be accommodated within the support member 31.
  • the steel rod 3 and bolt 13 are pulled up in the same way as those in the aforementioned Embodiments 1 and 2.
  • the bar 2 or 12 may be magnetically attached to the car body 100 by use of the magnet 21 so as to secure the support member 211 on the magnet 21.
  • the bar 2 or 12 pressed against the car body 100 through the resilient block 22 serving as a cushion is preferably fixed onto the space retaining member 20 by use of a screw 201 or the like.
  • the sheet metal repairing method of this invention which comprises locating the bar above a portion to be repaired of sheet metal, permitting the prescribed number of steel rods each having the engaging portion to be engaged to or inserted through the bar, welding the leading ends of the steel rods to the portion to be repaired of the sheet metal, and drawing the bar by using the drive means separately installed to pull up the steel rods, even a largely dented portion in the sheet metal of a car body or the like can be pulled out very easily by use of a conventional drive means. Further, even a linear dent portion can be easily be pulled out in the so-called line-pulling method.
  • the sheet metal working tool of the invention which comprises the bar having an arbitrary length, the steel rods each having the engaging portion to be engaged to the bar or inserted through the holes in the bar, the hook member formed on the bar for pulling out the bar, and the retaining members disposed on the leading ends of the steel rods for retaining the prescribed number of welding portions, produces the effect of easily pulling a wide, shallow dent portion in addition to the effect described above.
  • the sheet metal repairing method of the invention may comprise locating the bar above a portion to be repaired of a sheet metal, inserting a prescribed number of bolts through the bar, welding the leading ends of the bolts to the portion to be repaired of the sheet metal, screwing nuts to the bolts, and rotating the nuts to draw up the bolts, thereby to pull out the portion to be repaired of the sheet metal.
  • This method brings about the effect of suitably pulling out the dent portion in the sheet metal of the car body or the like bit by bit with the plurality of steel rods arranged at small intervals.
  • the portion to be repaired of the sheet metal can easily be pulled out to be made flat by a simple operation of rotating the nuts without using any other drive means.
  • the nuts may be more easily rotated by use of air pressure or other possible driving means. Besides, by screwing the nuts one by one in order, the work of pulling out the dent portion can easily and smoothly be carried out with a small rotating force without being forced to rotate. In addition to the effect of carrying out the pulling work with a simple operation, the dent portion can be repaired accurately to be made flat and smooth with bearing a burden lightly.
  • this invention brings about an effect of easily pulling out even a wide, deep dent portion in addition to the effects described above.
  • the device of the invention has the rotation preventing structure comprising the pin detachably fitted in the fitting groove in the bolt at the position opposite to the insertion hole in the bar for preventing the rotation of the bolt, the bolt can be securely pulled out without rotating, and the welded portion of the bolt can be undone with extreme ease by releasing the rotation preventing structure from the bar and rotating the bolt.
  • the device of the invention since the device of the invention has the ring serving as an insulator which is fitted in the insertion hole, the leading end of the steel rod or bolt can be securely welded in safety to the sheet metal without causing leak of electricity to the bar. Furthermore, by making the insertion hole slender, the position of the steel rod or bolt can be finely adjusted, consequently to make a more accurate repairing work possible. Since the space retaining member is disposed between the bar and the common surface of the sheet metal to secure the space therebetween, the effect of reducing pressure exerted on the portion to be repaired so as not to damage the portion to be repaired can be brought about.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
EP98120940A 1997-11-13 1998-11-04 Verfahren und Vorrichtung zum Reparieren von Metallplatten Withdrawn EP0916424A3 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP32958797 1997-11-13
JP32958797 1997-11-13
JP329587/97 1997-11-13
JP308482/98 1998-10-29
JP30848298 1998-10-29
JP30848298A JPH11216517A (ja) 1997-11-13 1998-10-29 板金の補修方法及び板金加工具

Publications (2)

Publication Number Publication Date
EP0916424A2 true EP0916424A2 (de) 1999-05-19
EP0916424A3 EP0916424A3 (de) 2002-01-23

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ID=26565565

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98120940A Withdrawn EP0916424A3 (de) 1997-11-13 1998-11-04 Verfahren und Vorrichtung zum Reparieren von Metallplatten

Country Status (2)

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EP (1) EP0916424A3 (de)
JP (1) JPH11216517A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1157758A1 (de) * 2000-05-26 2001-11-28 Adolf Würth GmbH & Co. KG Vorrichtung zum Entfernen von Beulen aus Blech
WO2003008125A1 (de) * 2001-07-19 2003-01-30 Ralph Meichtry Vorrichtung und verfahren zum entbeulen von blechteilen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2949144A (en) * 1958-08-07 1960-08-16 Arthur P Dredske Body and fender straightener
US4914942A (en) * 1989-01-27 1990-04-10 Kosei Ishihara Weld washer for vehicular body dent repair
US4930335A (en) * 1989-07-03 1990-06-05 Kosei Ishihara Lever-type auto body dent puller
EP0544191A1 (de) * 1991-11-24 1993-06-02 Kosei Ishihara Blechziehvorrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2949144A (en) * 1958-08-07 1960-08-16 Arthur P Dredske Body and fender straightener
US4914942A (en) * 1989-01-27 1990-04-10 Kosei Ishihara Weld washer for vehicular body dent repair
US4930335A (en) * 1989-07-03 1990-06-05 Kosei Ishihara Lever-type auto body dent puller
EP0544191A1 (de) * 1991-11-24 1993-06-02 Kosei Ishihara Blechziehvorrichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1157758A1 (de) * 2000-05-26 2001-11-28 Adolf Würth GmbH & Co. KG Vorrichtung zum Entfernen von Beulen aus Blech
WO2003008125A1 (de) * 2001-07-19 2003-01-30 Ralph Meichtry Vorrichtung und verfahren zum entbeulen von blechteilen

Also Published As

Publication number Publication date
EP0916424A3 (de) 2002-01-23
JPH11216517A (ja) 1999-08-10

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