WO2015118670A1 - Rondelle, rondelle comportant un écrou, et rondelle comportant un boulon - Google Patents

Rondelle, rondelle comportant un écrou, et rondelle comportant un boulon Download PDF

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Publication number
WO2015118670A1
WO2015118670A1 PCT/JP2014/052960 JP2014052960W WO2015118670A1 WO 2015118670 A1 WO2015118670 A1 WO 2015118670A1 JP 2014052960 W JP2014052960 W JP 2014052960W WO 2015118670 A1 WO2015118670 A1 WO 2015118670A1
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WO
WIPO (PCT)
Prior art keywords
washer
projection
bite
nut
bolt
Prior art date
Application number
PCT/JP2014/052960
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English (en)
Japanese (ja)
Inventor
一夫 中島
Original Assignee
株式会社マルナカ
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 株式会社マルナカ filed Critical 株式会社マルナカ
Priority to PCT/JP2014/052960 priority Critical patent/WO2015118670A1/fr
Priority to JP2015561123A priority patent/JPWO2015118670A1/ja
Publication of WO2015118670A1 publication Critical patent/WO2015118670A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
    • F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
    • F16B39/282—Locking by means of special shape of work-engaging surfaces, e.g. notched or toothed nuts

Definitions

  • the present invention relates to a washer, and a washer, a washer with a nut, and a washer with a bolt, which are difficult to be loosely engaged with screws when tightened with screws, bite into a connecting member (tightening member) such as metal plate and wood.
  • Patent document 1 is an example.
  • FIG. 3 discloses a washer having a projection (a washer projection) on the washer surface that engages with the head projection. The head projection engages with the washer projection when a bolt or a nut is tightened to prevent the bolt or the nut from loosening. Also, in FIG.
  • a bite projection is provided on the back surface of the washer, a recess is provided on the back surface and the base of the bite projection, and the bite projection bites into the connecting member
  • a protruding connecting material protruding meat
  • the head projections and washer projections (sometimes referred to collectively as "protrusions") of the screws disclosed in Patent Document 1 have a chevron shape (end face shape triangle) in which the tip end portion (ridge line portion) of the projection is sharp. Since it is elongated in the radial direction of the head of a washer or a nut, a bolt, etc .: the same applies hereinafter, there is a drawback that the tip portion is easily chipped or crushed (it is easy to be chipped). The loss of the tip is not preferable because it causes the loosening of screws.
  • the problem to be solved by the present invention is that the ridge line portion of the projection of the screw is not easily broken, the molding portion of the ridge line of the press die is not easily broken, the mold retention is good, and the screw locking structure capable of multiple press molding.
  • Another object of the present invention is to provide a washer which is hard to be chipped at the tip of the bite-in projection, is not chipped at the projection molding portion of the press die, has good moldability, and can be press-molded many times.
  • the washer according to the present invention is a washer provided with a through hole at the center, and bites are formed at several points in the circumferential direction on the back surface, and the bites are bited into a tightening object by tightening screws such as nuts and bolts. It is tapered as possible, and the tip is arc-like (R-like) or planar.
  • the bite projection may be conical, and the tip thereof may be arced or flat.
  • the bite-in protrusion may be pyramidal, and an outer peripheral surface corner portion (ridge line portion) of the bite-in protrusion may be arc-like or planar.
  • the bite projection has a cross-sectional shape of a semi-conical shape (including a substantially semi-circular shape: the same applies hereinafter), a crescent moon shape (a cross sectional shape is a crescent moon, and the tip side is tapered) And the like, and the tip of the tip may be arced or flat.
  • the flat portion of the semi-conical protrusion and the curved portion (curved surface) of the crescent cone-shaped protrusion can be provided so as to project in the tightening rotational direction ahead of the center of the washer.
  • the washer is a back surface thereof and has a recessed portion which is one step deeper than the back surface at a root peripheral portion of the biting projection, and the recessed portion is a meat (protruding meat) which bulges from the object by the biting projection biting into the object Can enter.
  • the washer is formed on the back surface thereof between the outer inner peripheral edge and the outer peripheral edge of the through hole in a ring shape, and the rear surface elevated base portion one step higher than the outer inner peripheral edge and the outer peripheral edge A protrusion may be formed.
  • the washer has bites at several locations in the circumferential direction on its back surface, and a large number of washer protrusions are provided at several locations in the circumferential direction on the surface, and the surface has projections with washer protrusions, and washer protrusions. There may be no non-protruding portion, and the bite projection may be formed on the back side of the non-protruding portion.
  • the plurality of washer protrusions are radial from the through hole side of the washer to the outer circumferential side, and the back circumferential direction of the head of the nut or the back of the head of the bolt (including hooks, screws, etc.) Meshing with a plurality of chevron-shaped head projections formed radially to ensure that the meshing does not loosen (including “hard to loosen”: the same applies hereinafter) after the tightening of the nut or bolt is completed.
  • the washer projection is a mountain shape having a climbing slope, a locking surface, and a ridge line portion at the intersection of both surfaces, the climbing slope is on the near side of the nut or bolt in the tightening rotation direction than the ridge line, and the locking surface is a ridge line The nut or bolt in the tightening rotational direction ahead of the part.
  • the overturn slope is a gentle upward slope in the tightening rotational direction
  • the locking surface is a steep slope or a vertical surface than the overrun slope
  • the ridge portion is an arc or planar shape.
  • the washer is formed on the surface thereof between the outer inner peripheral edge and the outer peripheral edge of the through hole, and a surface elevated portion which is one step higher than the outer inner peripheral edge and outer peripheral edge is formed in a ring shape.
  • a protrusion may be formed.
  • the nutated washer or bolted washer of the present invention is rotatably set on the back surface of the head of the nut or the back surface of the head of the bolt, and the washer projection faces the head projection of the nut or bolt to tighten the nut or bolt.
  • the washer projection and the head projection are engaged with each other.
  • the washer, nut washer and bolt washer of the present invention have the following effects. (1) Since the tip of the bite projection is arc-shaped or flat, the tip is less likely to be broken. Since the biting point forming portion of the press die can also be formed into an arc surface or a planar shape corresponding to the above-mentioned shape, it is difficult to chip and has a long life. (2) In the case where the bite-in process has a semiconical cross-sectional shape or a crescent moon-like shape, it is particularly hard to be lost.
  • FIG. 1 An example of the washer of this invention is shown, (a) is a top view, (b) is an arrow view of the washer protrusion of (a), (c) is an end view of another example of the washer protrusion ( d) is a front view of the washer of (a), (e) is a BB sectional view of (a), (f) is a bottom view of the washer, (g) is a CC sectional view of (f).
  • the other example of the washer of this invention is shown, (a) is a top view, (b) is a front view of a washer, (c) is a bottom view of a washer, (d) is a semi-conical bite projection of a washer.
  • (E) is an explanatory view of a state in which the flat surface of the semiconical bite-in protrusion is provided on the outer peripheral surface of the washer
  • (f) is an explanatory view of the crescent cone-like bite
  • (g) is a square pyramid Explanatory drawing of a state biting-in protrusion
  • (h) is CC sectional drawing of (c).
  • (A) is a front view of the washer with a nut of this invention
  • (b) is assembly explanatory drawing of the washer to a nut
  • (c) is a fragmentary sectional view of the washer with a nut of (a).
  • (A) is a front view of the bolted washer of this invention
  • (b) is a detailed view of P part of (a).
  • FIG. 4 (A)-(c) is assembly explanatory drawing of the bolted washer of Fig.4 (a).
  • (A)-(c) is process explanatory drawing in the case of fixing two board
  • (A) is a front view of a nut with a head protrusion
  • (b) is a front view of a bolt with a head protrusion.
  • (A) is a detailed view of the semiconical bite-in process of FIG.
  • FIG. 2 (d) is a vertical cross-sectional detail view of a conical bite projection
  • (b) is a vertical cross-sectional detail view of a semi-conical bite projection
  • (c) is a cross-sectional detail view of a square pyramidal bite projection.
  • FIG. 1 An example of the washer of the present invention is shown in FIG.
  • the washer 1 has an annular shape in which a through hole 2 is formed at a central portion.
  • the through hole 2 is a hole diameter through which the connecting shaft 26 (FIG. 3B), the bolt shaft 37 (FIG. 4A), and the like can be inserted.
  • the surface elevation 5 which is one step higher than the surface outer peripheral portion 4 is formed in a ring shape.
  • a large number of mountain-shaped washer protrusions 6 (FIG. 1A) are formed at four circumferential positions of the surface elevation portion 5, and non-protrusions 7 without washer protrusions are formed between the washer protrusions 6.
  • Biting-in projections 8 are provided in a projecting manner at four positions on the back surface of the non-projection portion 7.
  • the washer protrusions 6 at four places in FIG. 1 are formed in the circumferential direction of the surface elevated portion 5.
  • Each washer projection 6 is in the shape of a mountain, and includes a climbing slope 9 (FIG. 1B), a locking surface 10 and a ridge portion 11.
  • the slippery slope 9 (FIG. 1B) is formed on the near side in the tightening direction with respect to the ridgeline portion 11, the locking surface 10 is formed forward of the ridgeline portion 11 in the tightening direction, and the ridgeline 11 is a slippery slope 9 And the locking surface 10 (at the top of a mountain).
  • the top of the ridgeline portion 11 is arc-shaped (Fig.
  • the ridge line portion of the press die for molding the washer 1 is less likely to be chipped off during molding, and the mold is held (long-lasting).
  • the top portion of the ridgeline portion 11 is in the form of an arc or plane as shown in FIG. 1 (c), and it becomes difficult to chip or crush due to meshing with the projections (head projections) of screws such as bolts and nuts. Can be difficult).
  • the plurality of washer projections 6 have the same shape.
  • the projection dimension of the washer projection 6, the inclination angle of the overrun slope 9, the angle of the locking surface 10, the arc radius of the ridge 11 and the plane width in the case of a plane etc. are appropriately determined according to the size of the washer 1, use, etc. It can be designed.
  • the inclination angle (gradient) of the climbing slope 9 is preferably about 10 to 60 degrees, and the angle of the locking surface 11 is preferably about 70 to 90 degrees.
  • the bite projections 8 can have various shapes. Some examples are shown in FIGS. 2 (d)-(g).
  • the bite projections 8 are provided at four places on the back surface of the washer 1 in the circumferential direction (FIGS. 2A to 2C).
  • the biting projection 8 bites into a member to be tightened or connected when the washer 1 is tightened or rotated (hereinafter referred to as "object") 40 and 41 (FIGS. 6A to 6C).
  • the shape is a shape which is easy to bite into the object 40, 41, for example, a half cone shape (Fig. 2 (d) (e), Fig. 9 (a) (b)), crescent cone shape (Fig.
  • the tip 8a of the biting projection 8 is arc-shaped (FIG. 10 (a)) or flat (FIG. 10 (b)) so that the tip 8a is less likely to chip when biting and the press die is also less likely to chip Make it
  • the outer peripheral surface corner 8b is also made arc-like (FIG. 10 (c)) or flat to make it difficult to chip at the time of biting, making it difficult to chip the press die.
  • the bite projection 8 of FIG. 2 (d) is semi-conical as shown in FIG. 9 (a), and its flat portion 8d is made to project from the center line (X-X) of the washer 1.
  • FIG. 2 (e) is also semi-conical, the difference from FIG. 2 (d) is that the flat portion 8d of the biting projection 8 is exposed to the outer peripheral surface 5a of the surface elevated portion 5 (the outer peripheral surface 5a And on the same side).
  • the tip end portion 8a is shaped like an arc or a plane to obtain the above effect.
  • the bite projection 8 shown in FIG. 2 (f) has a crescent cone shape as shown in FIG. 9 (c).
  • the crescent-shaped bite-in projection 8 is also provided with its curved portion (curved surface) 8 e projecting inward from the center line (XX) of the washer 1. If the tip 8a of the biting projection 8 is made flat (FIG. 2 (h), FIG. 10 (b)) or it is made arced (FIG. 1 (g), FIG. 10 (a)), the above effect can be obtained It is.
  • the bite projection 8 shown in FIG. 2 (g) has a quadrangular pyramid shape
  • the tip 8a has an arc surface (FIG. 1 (g), FIG. 10 (a)) or a plane (FIG. 2 (h), FIG. b)
  • the four outer peripheral surface corner portions 8b are also formed in an arc surface shape (FIG. 10 (c)) or planar shape (octagonal pyramid shape)
  • the tip end portion 8a is also an outer peripheral surface surface corner portion (ridge line portion) 8b
  • the back surface of the washer 1 is flat, but if necessary, a back surface elevated part higher than them is formed in a ring shape between the outside of the through hole 2 and the outer peripheral edge of the washer 1 as well as the washer surface. You can also In this case, the bite-in projections 8 can be provided to protrude in four places in the circumferential direction of the rear surface elevated portion.
  • a recess 13 is formed on the back surface of the washer 1 at the roots 8c (FIGS. 1 (d) to 1 (h) and FIGS. 9 (a) to 3 (e)) of the bite projections 8.
  • the depressed portion 13 is formed by pressing the back surface of the washer 1 with a press die and projecting the biting projection 8 (protruding as the biting projection 8 by the amount depressed by pressure). If the depression 13 is present, the biting projection 8 can fully bite into the objects 40 and 41 (FIGS. 6A to 6C) up to the root 8c at the time of tightening, and the objects 40 and 41 swell up by the biting.
  • Meat (surplus meat) gets into the depression 13 and bites it into the washer 1 so that it is difficult for the washer 1 to reverse (hard to loosen).
  • the recess 13 in FIG. 1 (f) is formed in a circular shape all around the root 8c of the biting projection 8, it may have any other shape or area as long as it can be molded by pushing out the biting projection 8. .
  • FIGS. 3 (a) to 3 (c) Another example of the washer of the present invention is shown in FIGS. 3 (a) to 3 (c). This figure shows the case of a washer 25 with a nut rotatably mounted on the back side of the nut 20.
  • This washer 1 is the washer of FIG. 1 (a).
  • a head protrusion 21 is formed on the back surface of the nut 20.
  • the head projection 21 has a mountain shape including a climbing slope 22, a locking surface 23 and a ridge line portion 24, and the inclination angle of the climbing slope 22 and the locking surface 23, the height of the ridge line 24, etc.
  • the washer projection 6 can be engaged.
  • the head protrusion 21 rotates in the tightening direction of the nut 20
  • the head protrusion 21 rides over the climb slope 9 of the washer protrusion 6 and rotates, but in the reverse direction
  • the locking surface 23 of the head protrusion 21 is the locking surface of the washer protrusion 6 It is locked to 10 so that rotation is blocked.
  • the ridge line portion 24 of the head projection 21 is also formed into an arc surface or planar shape so that the head projection 21 is less likely to be broken even if it passes over the washer projection 6, and the press die is also less likely to be broken during molding.
  • the washer with nut 25 shown in FIG. 3 (a) can be manufactured, for example, in the steps shown in FIGS. 3 (a) to 3 (c).
  • (1) The connecting shaft 26 protruding from the back surface of the nut 1 is inserted into the through hole 2 of the washer 1 (FIG. 3 (b)).
  • FIG. 3 shows a bolted washer 36 incorporating the washer 1 on the back side of the head 31 of the bolt 30.
  • This washer 1 is the washer of FIG. 1 (a).
  • a head projection 32 is formed on the back of the head 31 of the bolt 30.
  • the head projection 32 has a mountain shape including a climbing slope 33, a locking surface 34, and a ridge line 35.
  • the size of the climbing slope 33 and locking surface 34, the inclination angle, etc. are the same as the washer projection 6 of the washer 1.
  • the surface 34 is locked to the locking surface 10 of the washer projection 6 to prevent rotation.
  • the top portion of the ridge portion 35 is also formed in an arc or planar shape so that it is difficult for the head projection 32 to break even if it passes over the washer protrusion 6 and to make it difficult for the ridge portion forming portion of the press die to be broken during molding. is there.
  • the bolted washer 36 shown in FIG. 4 (a) can be manufactured, for example, in the steps shown in FIGS. 5 (a) to 5 (c).
  • Insert a bolt shaft (shaft without screw) 37 (FIG. 5 (b)) projecting from the back of the head 31 of the bolt 30 into the through hole 2 of the washer 1 (FIG. 5 (b)).
  • the screw 38 (FIG. 5 (c)) is cut on the outer surface of the bolt shaft 37 projecting downward of the washer 1 and the washer 1 is attached (prevents removal). In this case, the washer 1 is rotatable.
  • the nutted washer 25 of FIG. 3 (a) and the bolted washer 36 of FIG. 4 (a) can be used, for example, as shown in FIGS. 6 (a) to 6 (c).
  • the bolt shaft 37 of the bolted washer 36 is inserted as shown in FIG. 6 (b) from above the two stacked plate materials (objects) 40 and 41.
  • the washer 25 with a nut is screwed on the bolt shaft 37 projecting downward of the lower plate 40, and the back of the washer 1 with the nut 25 contacts the lower plate 40 as shown in FIG.
  • the bite projection 8 of the washer 1 is made to bite into the lower plate 40, and the meat raised by the bite enters the recess 13 (FIG.
  • the bolt washer 36 can also be tightened in the same manner as in the above case.
  • FIG. 7 (a) An example of a nut that can be used in combination with the washer of the present invention is shown in FIG. 7 (a).
  • the washer 1 is not attached to the nut 20 of FIG. 3 (a). Therefore, the head projection 21 is a mountain shape having the overturn slope 22, the locking surface 23, and the ridge portion 24, and the size of the overrun slope 22, the locking surface 23, the inclination angle, etc. are washers 1 (FIG. 1 (a)).
  • the top portion of the ridge portion 24 is also formed into an arc or planar shape so that it is difficult to lose the head projection 21 even if it passes over the washer protrusion 6 so that the ridge portion molding location of the press die is also less likely to be lost during molding. is there.
  • FIG. 7 (b) An example of a bolt which can be used in combination with the washer of the present invention is shown in FIG. 7 (b).
  • the bolt 30 of this figure is the one to which the washer 1 of the bolt 30 of FIG. 4 (a) is not attached. Therefore, the head projection 32 is a mountain shape having the overturned slope 33, the locking surface 34, and the ridgeline portion 35, and the size of the overrun slope 33, the locking surface 34, the inclination angle, etc. is the washer 1 (FIG. 1 (a)).
  • the top portion of the ridge portion 35 is also formed into an arc or planar shape so that it is difficult for the head projection 32 to break even if it passes over the washer projection 6 and to make it difficult for the ridge portion molding location of the press die to be lost during molding. is there.
  • the washer 1 of the present invention can be used in combination with the nut 20 of FIG. 7 (a) and the bolt 30 of FIG. 7 (b) as shown in FIG. (1)
  • the washer 1 of FIG. 1 (a) is placed on the bolt shaft 37 projecting downward, and the nut 20 of FIG. 7 (a) is screwed onto the bolt shaft 37 from below.
  • the bolt 30 can be tightened. In this case as well, it can be tightened in the same manner as tightening the nut, and reverse rotation (return rotation) is prevented.
  • the root portion 21a of the head projection 21 and the root portion 6a (FIG. 3 (b), FIG. 4 (b)) of the washer projection 6 interlocking with each other are formed in an arc or plane. It is also possible to make it difficult for the root portion molding site to be broken.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bolts, Nuts, And Washers (AREA)

Abstract

Selon la présente invention, des saillies pénétrantes sont disposées dans une pluralité d'emplacements dans la direction périphérique de la surface arrière d'une rondelle, les saillies pénétrantes étant coniques, de manière à être aptes à pénétrer dans un sujet par le serrage d'une partie de vis telle qu'un écrou ou un boulon, et les pointes ayant une forme de surface incurvée ou une forme de surface plate. Les saillies pénétrantes sont coniques, et les pointes de ces dernières ont une forme de surface incurvée ou une forme de surface plate. Les saillies pénétrantes sont pyramidales, et les coins de surface périphérique externe (arêtes) des saillies pénétrantes ont une forme de surface incurvée ou une forme de surface plate. Les saillies pénétrantes ont un cône de section transversale semi-circulaire ou un cône en croissant, et les pointes de ces dernières ont une forme de surface courbe ou une forme de surface plate. Les surfaces plates des saillies pénétrantes en cône semi-circulaire et les surfaces courbes des saillies pénétrantes en cône en croissant font saillie vers l'avant dans la direction de rotation de serrage par rapport au centre de la rondelle. Des sections en creux, en creux étagé par rapport à la surface arrière de la rondelle, sont réalisées au niveau de la section au bord périphérique de la base des saillies pénétrantes et au niveau de la surface arrière de la rondelle, et les sections en creux sont aptes à s'adapter à l'entrée d'un matériau s'élevant à partir du sujet en résultat de la pénétration des saillies pénétrantes dans le sujet.
PCT/JP2014/052960 2014-02-07 2014-02-07 Rondelle, rondelle comportant un écrou, et rondelle comportant un boulon WO2015118670A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/JP2014/052960 WO2015118670A1 (fr) 2014-02-07 2014-02-07 Rondelle, rondelle comportant un écrou, et rondelle comportant un boulon
JP2015561123A JPWO2015118670A1 (ja) 2014-02-07 2014-02-07 座金、ナット付き座金、ボルト付き座金

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PCT/JP2014/052960 WO2015118670A1 (fr) 2014-02-07 2014-02-07 Rondelle, rondelle comportant un écrou, et rondelle comportant un boulon

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019034923A1 (fr) * 2017-08-14 2019-02-21 Patel Vinod Khetabhai Appareil de fixation pour la fixation de deux panneaux

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2034258A (en) * 1933-05-20 1936-03-17 Hausser Ernst Hermann Locking washer
US2956470A (en) * 1956-04-19 1960-10-18 Illinois Tool Works Piercing and tapping screw
JPH034014A (ja) * 1989-05-31 1991-01-10 T R W S I Kk ワッシャー
JPH07173878A (ja) * 1993-10-13 1995-07-11 Kai Kenchiku Sekkei Jimusho:Kk 高力ボルト接合部用接合補助部材並びに継手金具
JP2006307965A (ja) * 2005-04-28 2006-11-09 Marunaka:Kk 緩み止め座金とその座金を取付けた座金付き螺子類

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6132813U (ja) * 1984-07-31 1986-02-27 株式会社 大阪螺子製作所 ワツシヤ−付きネジ部材

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2034258A (en) * 1933-05-20 1936-03-17 Hausser Ernst Hermann Locking washer
US2956470A (en) * 1956-04-19 1960-10-18 Illinois Tool Works Piercing and tapping screw
JPH034014A (ja) * 1989-05-31 1991-01-10 T R W S I Kk ワッシャー
JPH07173878A (ja) * 1993-10-13 1995-07-11 Kai Kenchiku Sekkei Jimusho:Kk 高力ボルト接合部用接合補助部材並びに継手金具
JP2006307965A (ja) * 2005-04-28 2006-11-09 Marunaka:Kk 緩み止め座金とその座金を取付けた座金付き螺子類

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019034923A1 (fr) * 2017-08-14 2019-02-21 Patel Vinod Khetabhai Appareil de fixation pour la fixation de deux panneaux

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