EP2321481B1 - Patte de retenue pour bacs a joints debout sur supports bois et derives du bois - Google Patents

Patte de retenue pour bacs a joints debout sur supports bois et derives du bois Download PDF

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Publication number
EP2321481B1
EP2321481B1 EP09778297A EP09778297A EP2321481B1 EP 2321481 B1 EP2321481 B1 EP 2321481B1 EP 09778297 A EP09778297 A EP 09778297A EP 09778297 A EP09778297 A EP 09778297A EP 2321481 B1 EP2321481 B1 EP 2321481B1
Authority
EP
European Patent Office
Prior art keywords
screw
tab
tray
perforation
wood
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.)
Active
Application number
EP09778297A
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German (de)
English (en)
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EP2321481A1 (fr
Inventor
Christophe Bissery
Frédéric MARCON
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.)
Umicore NV SA
Original Assignee
Umicore NV SA
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 Umicore NV SA filed Critical Umicore NV SA
Priority to EP09778297A priority Critical patent/EP2321481B1/fr
Priority to PL09778297T priority patent/PL2321481T3/pl
Publication of EP2321481A1 publication Critical patent/EP2321481A1/fr
Application granted granted Critical
Publication of EP2321481B1 publication Critical patent/EP2321481B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D3/00—Roof covering by making use of flat or curved slabs or stiff sheets
    • E04D3/36—Connecting; Fastening
    • E04D3/361—Connecting; Fastening by specially-profiled marginal portions of the slabs or sheets
    • E04D3/362—Connecting; Fastening by specially-profiled marginal portions of the slabs or sheets by locking the edge of one slab or sheet within the profiled marginal portion of the adjacent slab or sheet, e.g. using separate connecting elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D3/00—Roof covering by making use of flat or curved slabs or stiff sheets
    • E04D3/36—Connecting; Fastening
    • E04D3/361—Connecting; Fastening by specially-profiled marginal portions of the slabs or sheets

Definitions

  • This invention relates to roof covering systems, in particular systems using zinc or zinc alloy bins for standing seam crimping.
  • Such bins are normally attached to the roof support using fixed and sliding metal brackets.
  • the function of the fixed legs is to secure the standing seam tray to the support, which normally is wood or derived, by blocking the thermal expansion movements of the zinc.
  • the sliding lugs are designed to take up the zinc expansion movements induced by the temperature variations while securing the standing seam tray to the support.
  • the present invention relates to fixed tabs.
  • the existing fixed legs are for example represented in the rules of the art as described in France in DTU 40.41 (Unified Technical Documents) entitled "Covering metal elements in sheets and long sheets of zinc”.
  • These fastening lugs comprise two holes, with or without casing, in anyone or not, and are fixed with ribbed tips or wood screws with a diameter of 4 mm. They are normally installed along the joint, every 33 cm.
  • GB 2 422 383 A discloses a tab according to the preamble of claim 1. If the passage to a single large-diameter screw seems a priori interesting, it causes however a specific problem that must be resolved. Such a leg is mounted in effect by aligning it and hanging it along the tray to be fixed. But when tightening the single screw, a torque is transmitted to the leg, especially important that the diameter of the screw is large. Such screws are more often provided, under their heads, pins initially intended to mill and thus better penetrate the wood. These generate additional friction that further increase the torque transmitted to the leg during tightening. This couple will rotate the tab until one of its ends is on the tray to be fixed with sufficient blocking force. It turns out that this blocking force can deform the leg and the tray, things that we want to avoid.
  • the object of the present invention is a bracket using a single screw, so simpler and faster to install than conventional tabs.
  • This tab is specially designed to avoid deforming and deforming the tray to be fixed when tightening the single screw. It thus brings a greater security of implementation and better mechanical performance.
  • the Figure 1 illustrates the invention by a three-dimensional isometric view.
  • the Figure 2 represents a paw seen from above.
  • the invention particularly relates to a metal fastening lug made in one piece for immobilizing a standing seam tray on a wooden support or derivative, comprising a first surface (1) provided with a perforation (2) for receiving a screw fastening to the support, a second surface (3) generally perpendicular to said first surface comprising a hook (4) intended to cooperate with the bank of the tray to be immobilized, these two surfaces defining a stop (5) of length L, characterized in that said hook (4) and said first surface (1) extend from the second surface (3) in opposite directions and said first surface includes a single perforation (2) for accommodating a single screw, and in that the center (6) of said perforation (2) is off-center with respect to the mediator (7) of the ridge (5), in the direction reducing the effort reflected on the tab and on the tray by the torque induced during the tightening said screw.
  • This tab is more particularly characterized in that the center (6) of the perforation (2) is off-center by a distance D greater than 10%, and preferably greater than 10%. 25%, of L with respect to the mediator (7) of the edge (5), so as to reduce the effort reflected on the tab and on the tray by the torque induced during the tightening of said screw.
  • the off-center distance can be adjusted according to the intensity of the forces resulting from the tightening torque. This intensity varies essentially according to the size of the screw heads used.
  • the perforation (2) for accepting the fixing screw is preferably provided with a casing (11) whose opening angle is usefully greater than 100 °.
  • a sheet of stainless steel AISI 304 will preferably be used to make the part by stamping.
  • a thickness of 0.4 mm is adequate.
  • the new bracket is secured with a single 5mm or 6mm diameter screw. Such a screw no longer rises under the effects of vibrations induced by wind and dimensional variations of the supports. Its superior resistance to tearing allows to install the legs at a pitch of 75 cm maximum instead of 33 cm maximum.
  • the new leg significantly increases the comfort of installation by allowing both easier installation and significant time saving installation by reducing the number of legs and the number of fasteners. These legs are also particularly compact, without the use of superfluous metal.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Connection Of Plates (AREA)
  • Roof Covering Using Slabs Or Stiff Sheets (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Description

  • Cette invention concerne les systèmes de couverture de toiture, en particulier les systèmes mettant en oeuvre des bacs en zinc ou en alliage de zinc pour sertissage à joints debout.
  • De tels bacs sont normalement fixés sur le support de toiture à l'aide de pattes métalliques fixes et coulissantes. La fonction des pattes fixes est d'arrimer le bac à joint debout au support, qui normalement est en bois ou dérivé, en bloquant les mouvements de dilatation thermique du zinc. Les pattes coulissantes sont prévues pour reprendre les mouvements de dilatation du zinc induits par les variations de températures tout en arrimant le bac à joint debout au support. La présente invention concerne les pattes fixes.
  • Les pattes fixes existantes sont par exemple représentées dans les règles de l'art telles que décrites en France dans le DTU 40.41 (Documents Techniques Unifiés) intitulé "Couverture par éléments métalliques en feuilles et longues feuilles en zinc". Ces pattes de fixations comprennent deux trous, avec ou sans cuvelage, en quiconque ou non, et se fixent à l'aide de pointes annelées ou de vis à bois d'un diamètre de 4 mm. Elles sont normalement installées le long du joint, tous les 33 cm.
  • Nous avons toutefois constaté que les pointes annelées, ainsi que les vis de faible diamètre jusqu'à 4 mm, peuvent remonter à cause des cycles de séchage du bois et des efforts répétitifs du vent. Egalement, un grand nombre de couvreurs utilisent des cloueurs automatiques par soucis d'économie de temps de pose, cela induisant toutefois une plus grande difficulté de mise en oeuvre du fait de l'encombrement de la machine. De plus, les pointes sont souvent frappées fort et déforment les pattes, ou sont frappées à côté des trous de la patte, ce qui induit un risque de performance insuffisante en termes de tenue à l'arrachement. Une patte mal installée crée un risque de mauvais sertissage du joint et donc un défaut d'étanchéité et d'esthétisme.
  • GB 2 422 383 A divulgue une patte selon le préambule de la revendication 1. Si le passage à une seule vis grand diamètre semble à priori intéressant, cela engendre toutefois un problème spécifique que l'on se doit de résoudre. Une telle patte se monte en effet en l'alignant et en l'accrochant le long du bac à fixer. Mais lors du serrage de l'unique vis, un couple de rotation est transmis à la patte, d'autant plus important que le diamètre de la vis est grand. De telles vis sont de plus bien souvent munies, sous leur tête, d'ergots initialement prévus pour fraiser et ainsi mieux pénétrer le bois. Ceux-ci engendrent des frottements supplémentaires qui augmentent encore le couple transmis à la patte lors du serrage. Ce couple fera pivoter la patte jusqu'à ce qu'une de ses extrémités porte sur le bac à fixer avec une force de blocage suffisante. Il s'avère que cette force de blocage peut déformer la patte ainsi que le bac, choses que l'on désire éviter.
  • L'objet de la présente invention est une patte de fixation utilisant une seule vis, donc plus simple et plus rapide à poser que les pattes classiques. Cette patte est spécialement conçue pour éviter de se déformer ainsi que de déformer le bac à fixer lors du serrage de l'unique vis. Elle apporte donc une plus grande sécurité de mise en oeuvre et de meilleures performances mécaniques.
  • La Figure 1 illustre l'invention par une vue isométrique tridimensionnelle. La Figure 2 représente une patte vue de dessus.
  • L'invention concerne en particulier une patte de fixation métallique realisée en une pièce pour immobiliser un bac à joint debout sur un support en bois ou dérivé, comprenant une première surface (1) munie d'une perforation (2) destinée à accueillir une vis de fixation au support, une seconde surface (3) généralement perpendiculaire à ladite première surface comprenant un crochet (4) destiné à coopérer avec la rive du bac à immobiliser, ces deux surfaces définissant une arrête (5) de longueur L, caractérisée en ce que ce crochet (4) et cette première surface (1) s'étendent de la seconde surface (3) dans des direction opposées et la ladite première surface comporte une seule perforation (2) destinée à accueillir une seule vis, et en ce que le centre (6) de ladite perforation (2) est décentrée par rapport à la médiatrice (7) de l'arête (5), dans la direction réduisant l'effort répercuté sur la patte et sur le bac par le couple induit lors du serrage de ladite vis.
  • Cette patte est plus particulièrement caractérisée en ce que le centre (6) de la perforation (2) se trouve décentré d'une distance D supérieure à 10%, et de préférence supérieure à 25%, de L par rapport à la médiatrice (7) de l'arête (5), de façon à réduire l'effort répercuté sur la patte et sur le bac par le couple induit lors du serrage de ladite vis.
  • La distance de décentrement peut être ajustée selon l'intensité des efforts résultants du couple de serrage. Cette intensité varie essentiellement selon la taille des têtes de vis utilisées.
  • On conçoit que pour réduire l'effort répercuté sur la patte et sur le bac par le couple induit lors du serrage de ladite vis, il faut décentrer le centre (6) de la perforation (2) en l'éloignant de l'extrémité (9) de la patte destinée à répercuter sur le bac le couple transmis lors du serrage de la vis, et non dans le sens opposé. Il dès lors clair que les Figures 1 et 2 correspondent à une pièce prévue pour une vis de fixation avec un filetage à droite, c'est à dire le cas usuel où le sens de serrage est celui des aiguilles d'une montre. Par rapport à la représentation de la Figure 2, il faut donc décentrer la perforation vers la droite.
  • Il est utile de ménager des renforts (10) le long de l'arête (5). Ceux-ci contribuent également à réduire les déformations de la patte lors du serrage, en bloquant l'angle formé par les surfaces (1) et (3).
  • La perforation (2) destinée à accepter la vis de fixation sera de préférence munie d'un cuvelage (11) dont l'angle d'ouverture est utilement supérieur à 100°.
  • Ceci permet de réduire les surface de contact avec la tête de la vis, et donc de réduire les frottements et par la aussi le couple de torsion transmis à la patte lors du serrage. Il existe des solutions de réduction des frottements par lubrification ou par l'utilisation de matériaux d'interfaces mais elles présentent l'inconvénient de complexifier le travail de l'opérateur et d'augmenter le coût de la solution.
  • On utilisera préférentiellement une tôle d'acier inoxydable AISI 304 pour réaliser la pièce par emboutissage. Une épaisseur de 0.4 mm est adéquate.
  • La nouvelle patte se fixe à l'aide d'une seule vis de diamètre 5 mm ou 6 mm. Une telle vis ne remonte plus sous les effets des vibrations induites par le vent et par les variations dimensionnelles des supports. Sa résistance supérieure à l'arrachement autorise d'installer les pattes au pas de 75 cm maximum au lieu de 33 cm maximum usuellement. La nouvelle patte augmente donc significativement le confort d'installation en permettant à la fois une pose plus aisée et un gain de temps de pose significatif par la réduction du nombre de pattes et du nombre de fixations. Ces pattes sont par ailleurs particulièrement compactes, sans utilisation de métal superflu.

Claims (6)

  1. Patte de fixation métallique réalisée en une pièce pour immobiliser un bac à joint debout sur un support en bois ou dérivé, comprenant une première surface (1) munie d'une perforation (2) destinée à accueillir une vis de fixation au support, une seconde surface (3), généralement perpendiculaire à ladite première surface comprenant un crochet (4) destiné à coopérer avec la rive du bac à immobiliser, ces deux surfaces définissant une arête (5) de longueur L,
    caractérisée en ce que ce crochet (4) et cette première surface (1) s'étendent de la seconde surface (3) dans des directions opposées et ladite première surface comporte une seule perforation (2) destinée à accueillir une seule vis, et en ce que le centre (6) de ladite perforation (2) est décentré par rapport à la médiatrice (7) de l'arête (5), dans la direction réduisant l'effort répercuté sur la patte et sur le bac par le couple induit lors du serrage de ladite vis.
  2. Patte selon la revendication 1, caractérisée en ce que le centre (6) de la perforation (2) se trouve décentré d'une distance D supérieure à 10% de L par rapport à la médiatrice (7) de l'arête (5), de façon à réduire l'effort répercuté sur la patte et sur le bac par le couple induit lors du serrage de ladite vis.
  3. Patte selon les revendications 1 ou 2, caractérisée en ce que des renforts (10) réalisés par emboutissage sont ménagés le long de l'arête (5).
  4. Patte selon une quelconque des revendications 1 à 3, caractérisée en ce que la perforation (2) destinée à accueillir la vis de fixation au support est munie d'un cuvelage (11).
  5. Patte selon la revendication 4, caractérisée en ce que ledit cuvelage (11) possède un angle d'ouverture à supérieur à 100°.
  6. Patte selon une quelconque des revendications 1 à 5, réalisée par emboutissage d'une tôle en acier inoxydable AISI 304.
EP09778297A 2008-09-12 2009-09-03 Patte de retenue pour bacs a joints debout sur supports bois et derives du bois Active EP2321481B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP09778297A EP2321481B1 (fr) 2008-09-12 2009-09-03 Patte de retenue pour bacs a joints debout sur supports bois et derives du bois
PL09778297T PL2321481T3 (pl) 2008-09-12 2009-09-03 Uchwyt do mocowania dla panel dachowych rąbka stojącego na wspornikach drewnianych i pochodnych drewna

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP08016089 2008-09-12
EP09778297A EP2321481B1 (fr) 2008-09-12 2009-09-03 Patte de retenue pour bacs a joints debout sur supports bois et derives du bois
PCT/EP2009/006376 WO2010028773A1 (fr) 2008-09-12 2009-09-03 Patte de retenue pour bacs a joints debout sur supports bois et derives du bois

Publications (2)

Publication Number Publication Date
EP2321481A1 EP2321481A1 (fr) 2011-05-18
EP2321481B1 true EP2321481B1 (fr) 2012-03-07

Family

ID=40292536

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09778297A Active EP2321481B1 (fr) 2008-09-12 2009-09-03 Patte de retenue pour bacs a joints debout sur supports bois et derives du bois

Country Status (10)

Country Link
US (1) US20110185671A1 (fr)
EP (1) EP2321481B1 (fr)
CN (1) CN102149881A (fr)
AT (1) ATE548523T1 (fr)
AU (1) AU2009291248A1 (fr)
DK (1) DK2321481T3 (fr)
ES (1) ES2383732T3 (fr)
PL (1) PL2321481T3 (fr)
PT (1) PT2321481E (fr)
WO (1) WO2010028773A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102839788B (zh) * 2012-08-15 2014-06-18 清华大学 一种咬扣式金属屋面板抗风加固自适应装置

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Also Published As

Publication number Publication date
DK2321481T3 (da) 2012-06-25
PL2321481T3 (pl) 2012-08-31
EP2321481A1 (fr) 2011-05-18
US20110185671A1 (en) 2011-08-04
CN102149881A (zh) 2011-08-10
ATE548523T1 (de) 2012-03-15
AU2009291248A1 (en) 2010-03-18
PT2321481E (pt) 2012-06-04
WO2010028773A1 (fr) 2010-03-18
ES2383732T3 (es) 2012-06-25

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