EP0320342B1 - Abkantbank - Google Patents

Abkantbank Download PDF

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Publication number
EP0320342B1
EP0320342B1 EP88403038A EP88403038A EP0320342B1 EP 0320342 B1 EP0320342 B1 EP 0320342B1 EP 88403038 A EP88403038 A EP 88403038A EP 88403038 A EP88403038 A EP 88403038A EP 0320342 B1 EP0320342 B1 EP 0320342B1
Authority
EP
European Patent Office
Prior art keywords
clamping element
fixed support
support beam
arms
articulated
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
EP88403038A
Other languages
English (en)
French (fr)
Other versions
EP0320342A1 (de
Inventor
Michel Goubaud
Michel Fleury
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.)
Dimos Batiment Distribution de Materiel Outillage et Securite pour le Batiment
Original Assignee
Dimos Batiment Distribution de Materiel Outillage et Securite pour le Batiment
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 Dimos Batiment Distribution de Materiel Outillage et Securite pour le Batiment filed Critical Dimos Batiment Distribution de Materiel Outillage et Securite pour le Batiment
Priority to AT88403038T priority Critical patent/ATE77269T1/de
Publication of EP0320342A1 publication Critical patent/EP0320342A1/de
Application granted granted Critical
Publication of EP0320342B1 publication Critical patent/EP0320342B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • B21D5/042—With a rotational movement of the bending blade

Definitions

  • the present invention relates generally to bending machines, that is to say machines or apparatus which have primarily the function of allowing the folding of any sheet of metal.
  • Such folding machines generally comprise, in addition to a folding apron making it possible to act on the sheet to be folded, a fixed bed base, which in a way forms the work table, and, for retaining, on this fixed bed base, the sheet to work, a blank holder, which is rotatably mounted on this fixed base between an open position, for which it gives access thereto, and a closed position, for which, by a support spout forming l 'one of its longitudinal edges, it is suitable for applying to this fixed base the sheet to be worked.
  • the blank holder is, for this purpose, articulated with two parallel connecting rods, which, each arranged respectively at its ends, extend transversely and are themselves each respectively articulated to the fixed base by two rods, one of which is linked to a lever specific to the operation of the assembly, and, jointly, their axes of articulation being established accordingly, these rods and these rods form, for the blank holder, locking means of the toggle type, by exceeding a line of maximum resistance when it passes into the closed position.
  • the blank holder is a simple angle iron, one of the sides of which forms, by one of its edges, bevelled for this purpose, the support spout, and the articulation of which with the bed base fixed is made, on the one hand, by a bar which, established along its edge, is, at its ends, engaged, in rotation, with the connecting rods, and, on the other hand, by two arms directly articulated to said fixed base.
  • the support spout of this blank holder which, in practice, is then most often formed by an insert on the relevant section of the corresponding angle to sufficiently extend this pan, is substantially offset, transversely, relative to the edge of this angle, and therefore relative to the bar by which the connecting rods implemented act on the assembly, even though it is toggle joint assembly to which participate these rods that precisely depends, in the closed position, the holding the worksheet.
  • the present invention generally relates to an arrangement which overcomes this difficulty, leading to a particularly effective strengthening of the holding of the sheet to be worked for the closed position of the blank holder, and further leading to other advantages.
  • a folder of the kind according to document EP-A-0 013 206 comprising a fixed base and a blank holder rotatably mounted on said fixed base between an open position, to which it gives access said fixed bed base, and a closed position, for which, by a support spout forming one of its longitudinal edges, it is suitable for applying to said fixed bed base a work sheet, said blank holder for this purpose being articulated with two parallel connecting rods, which, each arranged respectively at its ends, extend transversely and are themselves each respectively articulated to the fixed base by two connecting rods, said connecting rods and said connecting rods forming, for the blank holder, their axes (A1 , A2, A3) of articulation being established accordingly, locking means of the toggle type this folder being characterized in that, for its articulation with the two connecting rods, the blank holder has, transversely, perpendicular to its support spout, two ears, which, each arranged respectively at its ends, are each respectively connected to the
  • This clamping force can thus be perfectly controlled.
  • the blank holder can advantageously be lightened compared to comparable previous embodiments, which is particularly favorable. in the case of a site device.
  • the work to be applied to a sheet may be of a different nature than the folding provided above, as is the case when it comes to ensuring the cutting of such a sheet.
  • the folder according to the invention advantageously lends itself to the performance of functions other than the only folding function.
  • a baguette maker function in addition to a baguette maker function, it can be assigned, if desired, a cutting function.
  • a rail being associated for this purpose with the fixed base, for guiding a cutting device along the support spout of the blank holder, said rail is coupled to two arms, which, each disposed respectively at its ends, extend transversely, and by which it is permanently articulated to said fixed base, by being pivotally mounted on the latter between a retracted waiting position, for which it extends on the other side of said fixed base relative to the support spout of the blank holder, and a tilted service position for which it extends along this support spout.
  • the rail necessary for the implementation of the cutting device is advantageously permanently present on the fixed base, without it being necessary to remove it from it after use.
  • the folder according to the invention comprises a fixed base 10.
  • this bed base 10 itself comprises a hollow profile 11, of quadrangular cross section, and in square practice, with two transverse flanges 12, reported transversely, each respectively, at the ends of this profile 11.
  • a plate 13 which, formed of a single flat, runs over the entire length of this profile 11, from one of the two flanges 12 to the other, and which transversely extends overhanging along one of the longitudinal edges of the profile 11, in this case its front longitudinal edge, biting only partially on its upper face, and being supported, in gallows, along its free edge, by a spacer 14 connecting it in a triangle to the corresponding front side face of the profile 11.
  • this plate 13 is intended to form the useful part of the bed base 10, that is to say that on which must be placed the sheet 15 to work.
  • the flanges 12 of the base 10 form, each respectively, on the one hand, on the front side of this base 10, two ears 17, which, each arranged respectively at the ends of the plate 13, extend transversely, projecting from the upper surface thereof, with each a hole 18 centered on its upper front edge, and, on the other hand, on the rear side of the bed base 10, two uprights 19, which, each also disposed respectively at the ends of this bed base 10, also extend transversely, while being substantially offset towards the rear relative to the rear face of the profile 11 which comprises this box spring 10.
  • the base 10 thus formed is associated, in the usual way, a base 20 specific to its support.
  • the folder according to the invention further comprises a blank holder 22 rotatably mounted on the base 10 between an open position, FIG. 5A, for which it gives access to this base 10, and a closed position, FIGS. 1 to 3 and 5B, for which, by a spout d support 23, it is suitable for applying to said bed base 10, and, more precisely, to the plate 13 which the latter comprises, the sheet 15 to be worked, this blank holder 22 being for this purpose articulated with two parallel connecting rods 25, which, each arranged respectively at its ends, extend transversely and are themselves each respectively articulated to the bed base 10 by two rods 26.
  • the blank holder 22 is made in one piece by an angle iron, the edge of which extends parallel to the upper face of the profile 11 of the bed base 10, and one of the sides of which, the front panel 27 forms, by its free edge 28, bevelled for this purpose, the support spout 23.
  • the other side of this angle, the rear panel 29, extends substantially parallel to the upper face of the bed base 10, and more precisely of the section 11 thereof, for the position of closing the blank holder 22, so that, by this rear panel 29, and as shown diagrammatically in broken lines in FIG. 1, this blank holder 22 is advantageously able to form a plate suitable for the intervention of a baguetteuse 30.
  • the two sides 27, 29 of the angle iron thus constituting the blank holder 22 form between them a dihedral with an opening angle much greater than 90 °, so that, as desired, the support spout 23 of this blank holder 22 has, in cross section, a largely leaky profile.
  • the pan 29 carries, projecting, along its longitudinal edge opposite its support spout 23, a rule 31 suitable for ensuring the stiffening of the assembly and, according to arrangements known by themselves and therefore not described here, an adjustment of its concavity.
  • the blank holder 22 thus formed has, transversely, perpendicular to its support spout 23, two ears 32, which, each arranged respectively at its ends, are each respectively connected to the corresponding connecting rod 25 by articulation means.
  • these ears 32 which extend upwards, have a generally triangular outline, being attached, at their base, for example by welding, to the front panel 27 of the angle piece constituting the blank holder 22.
  • this blank holder 22 For the closed position of this blank holder 22, they extend substantially at the same height as the uprights 19 formed by the puddles 12 of the bed base 10.
  • the articulation means provided between them and the connecting rods 25 comprise, for each of these connecting rods 25, a shaft end 33, which, rigidly attached, for example by welding, on such a connecting rod 25, perpendicularly thereto, and therefore parallel to the longitudinal direction of elongation of the bed base 10, is engaged in a journalling fashion in a fur 36 itself rigidly attached to the corresponding ear 32, with, optionally, and as shown, interposition, between this end of the shaft 33 and this fur 36, of a bearing 37, suitably wedged, axially, relative to the fur 36.
  • A1 be the corresponding articulation axis.
  • This articulation axis A1 is shown in broken lines in FIG. 2, and it is shown diagrammatically by its trace in FIG. 1.
  • the connecting rods 25 extend beyond the flanges 12 of the bed base 10, and, likewise, the rods 26 extend beyond the rods 25.
  • the rods 26 are each respectively locked in rotation, by a pin 40, on a hollow shaft 41 which, running over the entire length of the section 11 of the bed base 10, inside this section 11, rotates through the flanges 12 of this base 10, with, possibly, and as shown, interposition, between this hollow shaft 41 and the corresponding bore 42 of such a flange 12, of any pad 43.
  • A2 be the corresponding articulation axis of the rods 26.
  • these articulation means comprise, as before, a shaft end 44, which is rigidly attached, for example by welding, to such a rod 26, perpendicular thereto, and therefore parallel to the longitudinal direction of elongation of the bed base 10, and with which is engaged, in rotation, by a notch 45 provided for this purpose at its end, the connecting rod 25 concerned, either directly or via a any fur and / or any pad.
  • a screw 46 engaged for screwing in a bar 47 attached transversely in the corresponding notch 45 of the connecting rod 25, acts, by means of a bearing 48 and a bearing 48 ′, on the end of the shaft 44, on the side thereof diametrically opposite the bottom of this notch 45, for adjusting the tension of the assembly.
  • A3 be the articulation axis thus intervening between the connecting rods 25 and the connecting rods 26.
  • At least one of the links 26 is integral with an operating lever 49.
  • this operating lever 49 is engaged in a socket 50 attached to the end of the rod 26 concerned, being wedged on this socket 50 by a pin 51.
  • the blank holder 22 has, transversely, along its longitudinal edge opposite its support spout 23, two arms 52, by which it is directly articulated to the bed base 10.
  • these arms 52 extend along the free edge of the rear panel 29 of the angle iron constituting this blank holder 22, obliquely with respect to this panel 29, in the direction of the free end of the uprights 19 of the bed base 10 , with, of each of them at the corresponding amount 19, means of articulation.
  • these articulation means comprise, in the embodiment shown, a shaft end 53, which is rigidly attached, for example by welding, on such an upright 19, perpendicular to that -this, and therefore parallel to the longitudinal direction of elongation of the bed base 10, and which, either directly or via a fur, with, possibly, the intervention of a pad, is engaged, in rotation, with the corresponding arm 52.
  • A4 be the hinge axis thus acting between the arms 52 of the blank holder 22 and the bed base 10.
  • the plane P which, shown diagrammatically in broken lines, by its trace, in FIG. 1, contains the articulation axis A1 of the ears 32 of the blank holder 22 with the connecting rods 25 and the axis of articulation A3 from the connecting rods 25 to the connecting rods 26 is, for the closed position of this blank holder 22, beyond the axis of articulation A2 of the connecting rods 26 to the bed base 10 relative to the support spout 23 of said hold-down 22.
  • the connecting rods 25 are bent in the embodiments shown, for bypassing the hollow shaft 41.
  • first section 25 ′ which, for the closed position of the blank holder 22, extends substantially vertically, perpendicular to the upper surface of the bed base 10, in line with the support spout 23 of this blank holder 22, and a second section 25 ⁇ which is oblique to the previous one, then extending backwards and downwards, in the direction opposite to this support spout 23.
  • the folder 10 further comprises, on the front side of the base 10, an apron 55, which, according to methods which, falling within the skill of the art, will not be described in detail here, is rotatably mounted on this box spring 10, by means of the holes 18 of the ears 17 of the flanges 12 thereof.
  • this deck 55 comprises, on the one hand, a section 56, which extends over the entire length of the section 11 of the bed base 10, between the flanges 12 thereof, on the side of the face front of this profile 11, and to which is attached any lever 57 adapted to allow the operation thereof, and, on the other hand, in the manner of the plate 13 of the bed base 10, a plate 58, which is attached, for example by welding, on the section 56, extending overhang on the latter, and the upper edge of which, for the rest position of the assembly, is level with the upper surface of this plate 13 of the box spring 10.
  • the folder according to the invention comprises, associated with its base 10, a rail 60 suitable for guiding a cutting device, not shown, along the support spout 23 of the blank holder 22.
  • this rail 60 is coupled to two arms 61, which, each arranged respectively at its ends, extend transversely, and by which it is permanently articulated to the bed base 10, and being mounted pivoting thereon between a retracted waiting position, FIGS. 1 to 5 and 5A, 5B, for which it extends on the other side of said base 10 relative to the support spout 23 of the blank holder 22, and therefore on the rear side of this base 10, and a tilted service position, FIG. 6, for which it extends along said support spout 23 of this blank holder 22.
  • the arms 61 thus carrying the rail 60 extend beyond the uprights 19 of the bed base 10 and they are each articulated respectively to these uprights 19, articulation means being established for this purpose from each of them to the corresponding amount 19.
  • these articulation means comprise a shaft end 63, which, according to arrangements similar to those previously described, is rigidly attached by example by welding, on such an arm 61, parallel to the longitudinal direction of elongation of the bed base 10, and which, either directly or indirectly, via a fur, with the possible intervention of a pad, is in taken in rotation with the corresponding amount 19.
  • the arms 61 carrying the rail 60 are sections of tube, but it could as well be flat or angles.
  • the rail 60 which is in the form of a simple square, is assigned, in the vicinity of each of its ends, a notch 64 suitable for allowing engagement on the ear 17 of the corresponding flange 12 of the base 10.
  • this rail 60 carries, locally, at least one tab 66 by which, for the definition of its retracted waiting position, it is adapted to come into abutment against a foot 21 of the associated base 20, as shown in Figures 1 and 3.
  • the blank holder 22 is first tilted into the open position, as shown in FIG. 5A.
  • This tilting of the rods 26 causes an uplift of the rods 25, and, therefore, by its arms 52, a pivoting of the blank holder 22 about its axis of articulation A4.
  • the sheet 15 to be worked is then placed on the plate 13 of the bed base 10, extending over the edge of the plate 58 of the deck 55, with its zone to be folded disposed between these two plates 13 and 58.
  • the connecting rods 26 are then tilted downwards, which lowers the connecting rods 25, and therefore causes the blank holder 22 to pivot, about its axis of articulation A4 , towards its closed position.
  • the sheet 15 to be worked is then firmly pinched between the plate 13 of the bed base 10 and the support spout 23 of the blank holder 22.
  • this guide rail 60 then comes to bear, by one of the sections of the angle iron which constitutes it, on the edge of the plate 58 of the deck 55, through the sheet 15 to be worked.
  • the axis of articulation of the arms 61 of the rail 60 to the uprights 19 of the bed base 10 is distinct from the axis of articulation A4 of the arms 52 of the blank holder 22.
  • the latter then extend between the arms 52 of the blank holder 22, which, moreover, avoids their grip outside the uprights 19, where they can inadvertently be hung, and, for bypassing the edge of the blank holder 22, they are bent.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Air Bags (AREA)
  • Special Chairs (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Assembled Shelves (AREA)
  • Tents Or Canopies (AREA)

Claims (9)

  1. Abkantbank mit einem feststehenden Träger (10) und einem Niederhalter (22), der an dem feststehenden Träger (10) zwischen einer öffnungsstellung, in der er einen Zugang für den feststehenden Träger (10) beläßt, und einer Schließstellung drehbar angebracht ist, in der er mittels einer Stütznase (23), die den einen seiner beiden Längsränder bildet, dem feststehenden Träger (10) ein zu bearbeitendes Blatt (15) bereitzustellen vermag, wobei hierzu der Niederhalter (22) gelenkig an zwei parallelen Zwischengliedern (25) angebracht ist, die jeweils an seinen Enden angeordnet sind, sich in Querrichtung erstrecken und selbst jeweils mittels zweier Schwingarme (26) am feststehenden Träger (10) gelenkig angebracht sind, und die Zwischenglieder (25) und Schwingarme (26), deren Drehachsen (A₁, A₂, A₃) infolgedessen definiert sind, für den Niederhalter (22) Verriegelungsmittel nach Art eines Kniegelenks bilden,
    dadurch gekennzeichnet,
    daß der Niederhalter (22) für sein gelenkiges Anbringen an zwei Zwischengliedern (25) in Querrichtung senkrecht zu seiner Stütznase (23) zwei Ohren (32) aufweist, die jeweils an seinen Enden angeordnet und jeweils über die Gelenkmittel mit dem entsprechenden Zwischenglied (25) verbunden sind.
  2. Abkantbank nach Anspruch 1,
    dadurch gekennzeichnet,
    daß die Zwischenglieder (25) abgewinkelt sind.
  3. Abkantbank nach Anspruch 2,
    dadurch gekennzeichnet,
    daß die Zwischenglieder (25) jeweils einen ersten Abschnitt (25') aufweisen, der sich in der Schließstellung des Niederhalters (22) im wesentlichen senkrecht zur oberen Fläche des feststehenden Trägers (10) ausgerichtet mit der Stütznase (23) dieses Niederhalters (22) erstreckt, sowie einen zweiten Abschnitt (25'') umfassen, der sich dazu schräg in einer der Stütznase (23) entgegengesetzten Richtung erstreckt.
  4. Abkantbank nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet,
    daß der Niederhalter (22) durch ein Winkelprofil gebildet ist, dessen einer Flächenabschnitt (27) durch seine freie Kante, die hierzu abgefast ist, die Stütznase (23) bildet, während der andere Flächenabschnitt (29) dieses Winkelprofils sich in der Schließstellung des Niederhalters (22) im wesentlichen parallel zur oberen Seite des feststehenden Trägers (10) erstreckt und über diesen Flächenabschnitt der Niederhalter (22) somit eine für einen Eingriff einer Leiste oder eines Stabes (30) geeignete Platte zu bilden vermag.
  5. Abkantbank nach einem der Ansprüche 1 bis 4,
    dadurch gekennzeichnet,
    daß ihrem feststehenden Träger (10) eine Schiene (60) zugeordnet ist, um eine Schneidvorrichtung entlang der Stütznase (23) des Niederhalters (22) zu führen, wobei die Schiene (60) mit zwei Armen (61) gekuppelt ist, die jeweils an ihren Enden angeordnet sind und sich in Querrichtung erstrecken, und über die sie fest am feststehenden Träger (10) angelenkt ist, wobei sie an diesem zwischen einer eingezogenen Bereitschaftsstellung, in der sie sich bezüglich der Stütznase (23) des Niederhalters (22) auf der anderen Seite des feststehenden Trägers (10) erstreckt, und einer umgekippten Arbeitsstellung schwenkbar angebracht ist, in der sie sich entlang dieser Stütznase (23) erstreckt.
  6. Abkantbank nach den Ansprüchen 3 und 5,
    dadurch gekennzeichnet,
    daß die Arme (61) der Schiene (60) gelenkig an Stützen (19) des feststehenden Trägers (10) angebracht sind, wozu für jeden der Arme (61) Gelenkmittel an der entsprechenden Stütze (19) vorgesehen sind.
  7. Abkantbank nach einem der Ansprüche 5 oder 6,
    dadurch gekennzeichnet,
    daß der Niederhalter (22) unter anderem in Querrichtung entlang seiner der Stütznase (23) gegenüberliegenden Längskante zwei Arme (52) aufweist, über die er unmittelbar gelenkig am feststehenden Träger (10) angebracht ist, wobei sich die Arme (61) der Schiene (60) zwischen diesen Armen (52) des Niederhalters (22) erstrecken.
  8. Abkantbank nach einem der Ansprüche 5 bis 7,
    dadurch gekennzeichnet,
    daß der Niederhalter (22) unter anderem in Querrichtung entlang seiner der Stütznase (23) gegenüberliegenden Längskante zwei Arme (52) aufweist, über die er unmittelbar gelenkig am feststehenden Träger (10) angebracht ist, wobei die Drehachse der Arme (61) der Schiene (60) und die der Arme (52) des Niederhalters (22) zusammenfallen.
  9. Abkantbank nach einem der Ansprüche 1 bis 8,
    dadurch gekennzeichnet,
    daß an zumindest einem Ende des Niederhalters (22) zwischen dem entsprechenden Ohr (32) dieses Niederhalters (22) und dem Zwischenglied (25), an dem es gelenkig angebracht ist, ein Freiraum verbleibt.
EP88403038A 1987-12-04 1988-12-01 Abkantbank Expired - Lifetime EP0320342B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88403038T ATE77269T1 (de) 1987-12-04 1988-12-01 Abkantbank.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8716909 1987-12-04
FR8716909A FR2624037B1 (fr) 1987-12-04 1987-12-04 Plieuse

Publications (2)

Publication Number Publication Date
EP0320342A1 EP0320342A1 (de) 1989-06-14
EP0320342B1 true EP0320342B1 (de) 1992-06-17

Family

ID=9357514

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88403038A Expired - Lifetime EP0320342B1 (de) 1987-12-04 1988-12-01 Abkantbank

Country Status (5)

Country Link
EP (1) EP0320342B1 (de)
AT (1) ATE77269T1 (de)
DE (1) DE3872193T2 (de)
ES (1) ES2032588T3 (de)
FR (1) FR2624037B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1312343B1 (it) * 1999-06-03 2002-04-15 Salvagnini Italia Spa Macchina piegatrice per fogli di lamiera con bordi alti.
FR3005589B1 (fr) * 2013-05-14 2015-09-04 Participations G Machine pour le pliage d'un flan
FR3012352B1 (fr) 2013-10-30 2016-04-15 G Participations Plieuse pour flan plat
CN115780601B (zh) * 2023-01-30 2023-05-05 潍坊医学院附属医院 一种金属件加工装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE825392C (de) * 1950-02-10 1951-12-17 Heinrich Troeger Abkantbank
CH411756A (de) * 1964-08-03 1966-04-30 Induba Ag Abkantmaschine
EP0013206B1 (de) * 1978-12-20 1984-08-01 Michel Goubaud Biegevorrichtung, insbesondere zum Bearbeiten von Zinkblech auf den Baustellen

Also Published As

Publication number Publication date
DE3872193D1 (de) 1992-07-23
EP0320342A1 (de) 1989-06-14
ATE77269T1 (de) 1992-07-15
FR2624037A1 (fr) 1989-06-09
ES2032588T3 (es) 1993-02-16
DE3872193T2 (de) 1992-12-17
FR2624037B1 (fr) 1990-05-04

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