EP1198687A1 - High rigidity flange connection device - Google Patents

High rigidity flange connection device

Info

Publication number
EP1198687A1
EP1198687A1 EP00948071A EP00948071A EP1198687A1 EP 1198687 A1 EP1198687 A1 EP 1198687A1 EP 00948071 A EP00948071 A EP 00948071A EP 00948071 A EP00948071 A EP 00948071A EP 1198687 A1 EP1198687 A1 EP 1198687A1
Authority
EP
European Patent Office
Prior art keywords
profile
profiles
sections
sheath
section
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Withdrawn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
EP00948071A
Other languages
German (de)
French (fr)
Inventor
Jo[L Genre-Grand-Pierre
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.)
Centre Est Ventilation
Original Assignee
Centre Est Ventilation
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 Centre Est Ventilation filed Critical Centre Est Ventilation
Publication of EP1198687A1 publication Critical patent/EP1198687A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting arrangements
    • F24F13/0254—Ducting arrangements characterised by their mounting means, e.g. supports
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/12—Flanged joints specially adapted for particular pipes
    • F16L23/14—Flanged joints specially adapted for particular pipes for rectangular pipes
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/003—Rigid pipes with a rectangular cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting arrangements
    • F24F13/0209—Ducting arrangements characterised by their connecting means, e.g. flanges

Definitions

  • the present invention relates to a high rigidity flange connection device for joining ventilation ducts or the like.
  • stiffening frames or flanges are well known consisting of a preliminary assembly of individual profiles which adapt to the free ends of the ducts.
  • the ventilation ducts often have large dimensions and they are frequently suspended using special means so that they are subjected to weight constraints and / or significant internal pressures which deform the ducts as well as the hollow profiles of their respective flanges which results in a lack of rigidity in the connection and therefore a lack of tightness at the level of the sheath connections.
  • pipe segments with planar sheet walls have been designed with a flange connection formed at the free ends of the walls; said flange connection consisting of a hollow profile completely closed on itself; this is for example the case of Swiss patent CH 680,873 describing an air duct segment.
  • the hollow profile of the flange connection is formed by four wings obtained by four successive foldings towards the inside of the hollow profile, the first and fourth wings of which extend perpendicular to the wall of the channel, the second wing returns to the wall of the channel. as an oblique support wing, and the third wing is arranged parallel to the wall of the channel so that the hollow profile has a triangular cross section.
  • the third wing of the hollow profile is in contact with the wall of the channel and the fourth wing is in contact with the first wing, so that the hollow profile is closed, thus providing a rigid beam improving the tightness of the flange connection.
  • this profile has the drawback of not ensuring a perfect seal at the sheath connections, in particular, against infiltration. outside water.
  • One of the aims of the invention is therefore to overcome these drawbacks by proposing a high-rigidity flange connection device making it possible to join sheaths while ensuring perfect sealing of the connection.
  • the high rigidity flange connection device for joining duct sections for example, ventilation ducts, duct sections or the like, of polygonal sections comprising hollow profiles s' extending towards the outside of the sheaths, each profile comprising a bearing edge so that, when two sheath sections are joined, the bearing edges of the corresponding profiles are joined, and said hollow profiles cooperating with pieces of angle introduced into the respective hollows of two neighboring profiles of the same section of sheath is remarkable in that each hollow profile results from a winding of sheet metal by five successive folds generally in the same direction and towards the inside of the profile, so that a section cover polygonal, forming a joint cover, or capable of being clipped onto two joined profiles, that the cross section of the profile is generally closed and that said profile has at least one internal fold which extends parallel to the internal face of the edge support so that, when jointing two sections of sheath, the corner pieces constrain the internal fold on the internal face of said support edge completely closing the profile on itself thus providing
  • the hollow profiles come from and formed from at least one of the free ends of the sheath sections.
  • FIG. 1 is a partial exploded perspective view of a flange connection between two sections of ducts
  • FIG. 2 is a partial perspective view of a hollow profile according to the invention
  • FIG. 3 is a perspective view of a corner piece in 2 parts according to the invention.
  • FIG. 4 is a perspective view of a corner piece in the form of a square according to the invention.
  • FIG. 5 is a sectional view along the axis V-V of Figure 1.
  • the section 1a of a sheath is connected to a second section 1b, shown in FIGS. 1 and 5, by a flange connection device 2.
  • Each section of sheaths a and 1b has four flat walls 3, conventionally made of sheet metal, which extend perpendicularly to each other by virtue of folds 4 at right angles determining for each section of sheaths la and lb a generally rectangular section.
  • each section 1a and 1b has at least one free end 5 corresponding to the ends of their walls 3 and situated in a plane perpendicular to the longitudinal axis of symmetry A of said sections 1a and 1b.
  • this device consists of hollow profiles 6 extending transversely along the ends of each wall 3 towards the outside of the sections 1a and 1b, of pieces of angles 7 and possibly of a cover or joint cover 8 as will be seen below.
  • the bearing edge 9 is extended by a wing 11 extending towards the sheath section, obtained by a second bending 12 of the sheet, parallel to the bending 10, and forming an acute angle, for example of 45 °, with said bearing edge 9.
  • the wing 11 is extended by a second wing 13 obtained by a third fold 14, parallel to the previous ones and in the same direction as the previous folds 10 and 12, that is to say towards the inside of the profile 6.
  • the wing 13 is also extended by a wing 15, obtained by a fourth folding 16, parallel to the previous ones, towards the inside of the profile 6, extending generally parallel to the wall 3 of the section lb towards the bearing edge 9 so that said wing 15 is in contact with the wall 3 of the sheath section lb.
  • the wing 15 can extend parallel to the wall 3 of the section lb so that the distance separating said wing 15 and the wall 3 is only a few millimeters without affecting the rigidity of the profile. 6 and therefore its effectiveness.
  • the wing 15 is finally extended by an internal fold 17, obtained by a final folding 18, parallel to the previous ones, always towards the inside of the profile 6 so that it extends generally parallel to the internal face of the edge. support 9 so that, when the two sheath sections 1a and 1b are joined, the corner pieces 7 constrain the internal fold 17 on the internal face of said support edge 9 completely closing the profile 6 on itself to provide a particularly rigid and solid beam effect as can be seen in FIG. 5.
  • the hollow profiles 6 may include a recess obtained by folding the profile outward to obtain a particular profile making it possible to receive, for example, a protective member such as a joint cover or the like.
  • the hollow profiles 6 can also be formed by successive folds as described above from independent sheet plates. They then form individual profiles constituting, by a preliminary assembly by means of corner pieces 7, stiffening frames which conventionally adapt to the free ends 5 of the sheath sections 1a and 1b by welding for example.
  • the corner pieces 7, with reference to FIGS. 4 and 5 are generally flat angled square pieces of metal, a thickness of a few millimeters having a middle plate 19 connecting two branches 20,21 which can slide respectively in the hollows of two profiles 6 neighbors of the same section of sheath there or lb.
  • the branches 20, 21 extend on either side of the central plate 19 in the same plane and over an equal distance so that the corner pieces 7 have an axis of symmetry B, which extends in the plane formed by said branches 20,21, shown in dotted lines in Figure 4, to be able to be introduced into the hollows of two profiles 6 any neighbors.
  • the central plate 19 furthermore comprises, in its central part, a hole 22 for receiving clamping means such as a bolt for example.
  • the hole 22 is preferably centered on the axis of symmetry B to distribute uniformly over the two branches 20,21 the forces due to the tightening of the corner pieces 7, one against the other, when connecting two sections of ducts 1a and 1b (FIG. 5).
  • the branches 20, 21 also include a recess 23, obtained by stamping said branches 20, 21, extending longitudinally over part of their length so that, when the two sheath sections 1a and 1b are joined, each branch 20,21 is in contact simultaneously with the internal fold 17 and the internal face of the bearing edge 9 of the corresponding hollow profile 6 as 1 'indicates in Figure 5.
  • each branch 20,21 comprises, on the same face that the recess 23, a boss 24 of generally triangular section extending longitudinally over a part of its length so that said boss 24 matches a part of the internal surface when the branches 20, 21 of the corner pieces 7 are introduced in the hollows of said profiles 6 to ensure greater rigidity in the profiles 6.
  • the branches 20,21 of the corner pieces 7, such as described above, are positioned in the respective recesses of two neighboring profiles 6 during the manufacture of the sheath sections 1a and 1b. Indeed, the sections there and lb are then respectively obtained from four rectangular sheets 3 of sheet metal at the transverse ends of which hollow profiles have been formed, as described above.
  • the branches 20, 21 of the corner pieces 7 are then slid into the respective hollows of two profiles 6 of two plates 3 at each of their ends, then, said plates 3 are joined by stapling, for example, thus forming a right angle for finally obtain a sheath section of rectangular section.
  • the corner pieces 7, with reference to FIGS. 3 and 5 are formed from two generally flat plates a few millimeters thick forming two branches 20,21 distinct overlapping each other at their ends at a right angle.
  • Each branch 20, 21 comprises at one of its ends a nesting zone 25, respectively 26, generally square, conventionally obtained by stamping, comprising respectively a hole 27 and 28 in their centers so that the nesting zones 25.26 respectively of the branches 20,21 being brought into contact, the hole 27 is exactly in line with the hole 28 to receive securing means such as a rivet, a bolt or the like and that the branches 20,21 are blocked in rotation and translation relative to each other.
  • the branch 21 comprises at the edge of the nesting zone 26 a recess 29, also obtained by stamping, so that the branches 20, 21 extend in the same plane when they are assembled.
  • the branches 20,21 further comprise a recess 23, obtained by stamping said branches 20,21, extending longitudinally over a part of their length so that when jointing of the two sections of sheath there and lb_, each branch 20, 21 is in contact simultaneously with the internal fold 17 and the internal face of the bearing edge 9 of the corresponding hollow profile 6 as 1 'indicates in FIG. 5.
  • each branch 20, 21 comprises, on the same face as the recess, a boss 24 of triangular section extending longitudinally over part of its length so that said boss 24 follows a part of the internal surface when the branches 20 , 21 of the corner pieces 7 are introduced into the hollows of said profiles 6 to ensure greater rigidity in the profiles 6.
  • connection device 2 finally comprises, with reference to FIGS. 1 and 5, a seal 30, conventionally elastic, positioned between the respective bearing edges of two profiles 6 (FIG. 5) to perfect the seal during the jointing of the two sheath sections 1a and 1b- It also includes a joint cover 8 comprising straight elements 31 and bent elements 32 of generally polygonal sections capable of being clipped onto two joined profiles to protect the connection against infiltration of external water.
  • flange connection device can be adapted to all types of sheaths, conduits or the like, such as sheaths of polygonal cross section and that the examples which have just been given are not as particular illustrations which in no way limit the fields of application of the invention.

Abstract

The invention concerns a high rigidity flange connection device for jointing sections of duct (1b), conduit or the like, with polygonal cross-section comprising hollow profiles (6) extending outwards of the ducts (1b), each profile (6) including a support edge (9) such that when the two sections (1b) are being jointed, the support edges (9) of the corresponding profiles (6) are joined together. The invention is characterised in that each hollow profile (6) is obtained by winding a sheet metal with five successive folds (10, 12, 14, 16, 18) globally in the same direction and towards the inside of the profile (6), so that a bonnet (8) with polygonal cross-section, can be clipped on two jointed profiles (6), the transverse cross-section of the profile (6) is globally closed and said profile (6) has at least one inner fold (17) extending parallel to the inner surface of support edge (9) so that, when the two sections of the duct (1a, 1b) are being jointed, the corner parts (7) force the inner fold (17) onto the inner surface of said support edge (9) completely closing the profile (6) on itself thereby providing a rigid beam ensuring that the connection is perfectly sealed.

Description

DISPOSITIF DE LIAISON A BRIDE A HAUTE RIGIDITE HIGH RIGIDITY FLANGE CONNECTION DEVICE
La présente invention concerne un dispositif de liaison à bride à haute rigidité pour jonctionner des gaines de ventilation ou analogues.The present invention relates to a high rigidity flange connection device for joining ventilation ducts or the like.
Dans le domaine des gaines de ventilation, on connaît bien des cadres raidisseurs ou des brides constituées par un assemblage préliminaire de profilés individuels qui s'adaptent aux extrémités libres des gaines.In the field of ventilation ducts, stiffening frames or flanges are well known consisting of a preliminary assembly of individual profiles which adapt to the free ends of the ducts.
C'est, par exemple, le cas du brevet français FR 2 505 448 concernant des brides reliant deux tronçons d'une gaine. Ce brevet décrit des brides constituées de profils creux ouverts qui sont placés aux extrémités libres des parois des gaines auxquelles ils sont solidarisés par des points de soudure. Ces profils creux coopèrent avec des pièces d'angle en forme d'équerre dont les branches sont introduites dans les creux respectifs de deux profils voisins avant d'être classiquement contreserrées par vis pour former le raccordement .This is, for example, the case of French patent FR 2 505 448 concerning flanges connecting two sections of a sheath. This patent describes flanges made up of open hollow profiles which are placed at the free ends of the walls of the sheaths to which they are secured by welding points. These hollow profiles cooperate with angle-shaped corner pieces whose branches are introduced into the respective hollows of two neighboring profiles before being conventionally counter-clamped by screws to form the connection.
La fixation des profils creux aux extrémités libres des gaines par des points de soudure présente, toute considération esthétique mise à part, l'inconvénient de nécessiter un chauffage local qui détruit la protection antirouille des gaines, notamment celle des gaines en tôle galvanisée, de sorte qu'il est nécessaire d'appliquer une peinture protectrice sur les points de soudure aggravant ainsi le temps de fabrication desdites gaines.The fixing of the hollow profiles to the free ends of the sheaths by welding points has, all aesthetic considerations aside, the drawback of requiring local heating which destroys the rust protection of the sheaths, in particular that of the sheaths of galvanized sheet metal, so that it is necessary to apply a protective paint on the weld points thus increasing the manufacturing time of said sheaths.
Par ailleurs, les gaines de ventilation ont souvent des grandes dimensions et elles sont fréquemment suspendues à l'aide de moyens particuliers de sorte qu'elles subissent des contraintes pondérales et/ou des pressions intérieures importantes qui déforment les gaines ainsi que les profils creux de leurs brides respectives dont il résulte un manque de rigidité dans la liaison et donc un défaut d' étanchéité au niveau des raccords des gaines .Furthermore, the ventilation ducts often have large dimensions and they are frequently suspended using special means so that they are subjected to weight constraints and / or significant internal pressures which deform the ducts as well as the hollow profiles of their respective flanges which results in a lack of rigidity in the connection and therefore a lack of tightness at the level of the sheath connections.
A cet égard, on a conçu des segments de canalisation à parois en tôles planes avec un raccord à brides formé aux extrémités libres des parois ; ledit raccord à brides étant constitué d'un profil creux totalement fermé sur lui-même ; c'est par exemple le cas du brevet Suisse CH 680.873 décrivant un segment de canalisation d'air. Le profil creux du raccord à brides est formé par quatre ailes obtenues par quatre pliages successifs vers l'intérieur du profil creux dont la première et la quatrième ailes s'étendent perpendiculairement à la paroi du canal, la seconde aile retourne vers la paroi du canal comme aile de soutien oblique, et la troisième aile est disposée parallèlement à la paroi du canal de sorte que le profil creux présente une section transversale triangulaire. De plus, la troisième aile du profil creux est au contact de la paroi du canal et la quatrième aile est au contact de la première aile, de sorte que le profil creux est fermé procurant ainsi une poutre rigide améliorant 1 ' étanchéité du raccord à bride. Outre le fait qu'un tel profil creux n'est pas réalisable à partir d'une machine à plier la tôle, ce profil présente 1 ' inconvénient de ne pas assurer une parfaite étanchéité au niveau des raccords de gaine, notamment, contre les infiltrations d'eau extérieure. L'un des buts de l'invention est donc de palier ces inconvénients en proposant un dispositif de liaison à bride à haute rigidité permettant de jonctionner des gaines tout en assurant une parfaite étanchéité de la liaison.In this regard, pipe segments with planar sheet walls have been designed with a flange connection formed at the free ends of the walls; said flange connection consisting of a hollow profile completely closed on itself; this is for example the case of Swiss patent CH 680,873 describing an air duct segment. The hollow profile of the flange connection is formed by four wings obtained by four successive foldings towards the inside of the hollow profile, the first and fourth wings of which extend perpendicular to the wall of the channel, the second wing returns to the wall of the channel. as an oblique support wing, and the third wing is arranged parallel to the wall of the channel so that the hollow profile has a triangular cross section. In addition, the third wing of the hollow profile is in contact with the wall of the channel and the fourth wing is in contact with the first wing, so that the hollow profile is closed, thus providing a rigid beam improving the tightness of the flange connection. . In addition to the fact that such a hollow profile cannot be produced from a sheet metal bending machine, this profile has the drawback of not ensuring a perfect seal at the sheath connections, in particular, against infiltration. outside water. One of the aims of the invention is therefore to overcome these drawbacks by proposing a high-rigidity flange connection device making it possible to join sheaths while ensuring perfect sealing of the connection.
A cet égard et conformément à l'invention, le dispositif de liaison à bride à haute rigidité pour jonctionner des tronçons de gaine, par exemple, des gaines de ventilation, des tronçons de conduit ou analogues, de sections polygonales comprenant des profils creux s ' étendant vers l'extérieur des gaines, chaque profil comprenant un bord d'appui de sorte que, lors du jointoiement de deux tronçons de gaine, les bords d'appui des profils correspondants soient joints, et lesdits profils creux coopérant avec des pièces d'angle introduites dans les creux respectifs de deux profils voisins d'un même tronçon de gaine est remarquable en ce que chaque profil creux résulte d'un enroulement de tôle par cinq pliages successifs globalement dans le même sens et vers l'intérieur du profil, de sorte qu'un capot de section polygonale, formant un couvre-joint , soit apte à être clipsé sur deux profils joints, que la section transversale du profil soit globalement fermée et que ledit profil ait au moins un repli intérieur qui s'étende parallèlement à la face interne du bord d'appui pour que, lors du jointoiement de deux tronçons de gaine, les pièces d'angle contraignent le repli intérieur sur la face interne dudit bord d'appui fermant totalement le profil sur lui-même procurant ainsi une poutre rigide assurant une étanchéité parfaite de la liaison.In this regard and in accordance with the invention, the high rigidity flange connection device for joining duct sections, for example, ventilation ducts, duct sections or the like, of polygonal sections comprising hollow profiles s' extending towards the outside of the sheaths, each profile comprising a bearing edge so that, when two sheath sections are joined, the bearing edges of the corresponding profiles are joined, and said hollow profiles cooperating with pieces of angle introduced into the respective hollows of two neighboring profiles of the same section of sheath is remarkable in that each hollow profile results from a winding of sheet metal by five successive folds generally in the same direction and towards the inside of the profile, so that a section cover polygonal, forming a joint cover, or capable of being clipped onto two joined profiles, that the cross section of the profile is generally closed and that said profile has at least one internal fold which extends parallel to the internal face of the edge support so that, when jointing two sections of sheath, the corner pieces constrain the internal fold on the internal face of said support edge completely closing the profile on itself thus providing a rigid beam ensuring perfect sealing of the link.
On voit bien qu'un tel profil, complètement fermé après la liaison de deux gaines, procure, par sa rigidité, une parfaite étanchéité entre les deux tronçons de gaine.It is clear that such a profile, completely closed after the connection of two sheaths, provides, by its rigidity, a perfect seal between the two sections of sheath.
Par ailleurs et selon une caractéristique essentielle du dispositif conforme à l'invention, les profils creux sont issus et formés à partir d'au moins une des extrémités libres des tronçons de gaine.Furthermore and according to an essential characteristic of the device according to the invention, the hollow profiles come from and formed from at least one of the free ends of the sheath sections.
On comprend bien qu'il n'est alors plus nécessaire de souder les brides aux extrémités libres des tronçons de gaine qui sont ainsi préservés des risques de rouille à l'occasion de leur montage.It will be understood that it is no longer necessary to weld the flanges to the free ends of the sheath sections which are thus preserved from the risks of rust during their mounting.
D'autres avantages et caractéristiques ressortiront mieux de la description qui va suivre de plusieurs variantes d'exécution, données à titre d'exemples non limitatifs, du dispositif de liaison à bride conforme à l'invention en référence aux dessins annexés sur lesquels : la figure 1 est une vue partielle éclatée en perspective d'une liaison à bride entre deux tronçons de gaines, - la figure 2 est une vue partielle en perspective d'un profil creux conforme à l'invention,Other advantages and characteristics will emerge more clearly from the description which follows of several alternative embodiments, given by way of nonlimiting examples, of the flange connection device according to the invention with reference to the appended drawings in which: FIG. 1 is a partial exploded perspective view of a flange connection between two sections of ducts, FIG. 2 is a partial perspective view of a hollow profile according to the invention,
- la figure 3 est une vue en perspective d'une pièce d'angle en 2 parties conforme à l'invention,FIG. 3 is a perspective view of a corner piece in 2 parts according to the invention,
- la figure 4 est une vue en perspective d'une pièce d'angle en forme d'équerre conforme à l'invention,FIG. 4 is a perspective view of a corner piece in the form of a square according to the invention,
- la figure 5 est une vue en coupe selon l'axe V-V de la figure 1.- Figure 5 is a sectional view along the axis V-V of Figure 1.
On décrira, dans cet exemple non limitatif, un dispositif de liaison pour jonctionner des tronçons de gaines de sections globalement rectangulaires telles que des gaines de ventilation par exemple.In this nonlimiting example, we will describe a connecting device for joining sections of ducts of generally rectangular sections such as ventilation ducts for example.
Le tronçon la d'une gaine est relié à un second tronçon lb, représentés sur les figures 1 et 5, par un dispositif de liaison à bride 2. Chaque tronçon de gaines a et lb présente quatre parois planes 3, classiquement en tôle, qui s'étendent perpendiculairement les unes par rapport aux autres grâce selon des plis 4 à angle droit déterminant pour chaque tronçon de gaines la et lb une section globalement rectangulaire. Par ailleurs, chaque tronçon la et lb a au moins une extrémité libre 5 correspondant aux extrémités de leurs parois 3 et située dans un plan perpendiculaire à 1 ' axe longitudinal de symétrie A desdits tronçons la et lb. Naturellement, le raccordement des tronçons la et lb. se fait par rapprochement de leurs extrémités libres 5 correspondantes positionnées en regard l'une de l'autre avant d'être solidarisées par le dispositif de liaison à bride 2. En référence aux figures 1 et 5 , ce dispositif est constitué de profils creux 6 s ' étendant transversalement le long des extrémités de chaque paroi 3 vers 1 ' extérieur des tronçons la et lb, de pièces d'angles 7 et éventuellement d'un capot ou couvre-joint 8 comme on le verra plus loin. Le profil creux 6, en référence à la figure 2, comprend un bord d'appui 9 obtenu par un premier pli 10, par exemple dans la tôle issue de l'une des parois 3 du tronçon lb, s ' étendant vers l'extérieur dudit tronçon lb le long de son extrémité libre 5, c'est-à-dire le long des extrémités de chacune de ses parois 3, perpendiculairement à son axe longitudinal de symétrie A de manière que, lors du jointoiement des deux tronçons de gaines la et lb, les bords d'appui 9 des profils creux 6 correspondants soient joints. Le bord d'appui 9 est prolongé par une aile 11 s ' étendant vers le tronçon de gaine, obtenue par un second pliage 12 de la tôle, parallèle au pliage 10, et formant un angle aigu, par exemple de 45°, avec ledit bord d'appui 9. L'aile 11 est prolongée par une seconde aile 13 obtenue par un troisième pliage 14, parallèle aux précédents et dans le même sens que les pliages précédents 10 et 12, c'est-à-dire vers l'intérieur du profil 6. L'aile 13 est également prolongée par une aile 15, obtenue par un quatrième pliage 16, parallèle aux précédents, vers l'intérieur du profil 6, s 'étendant globalement parallèlement à la paroi 3 du tronçon lb vers le bord d'appui 9 de sorte que ladite aile 15 soit en contact avec la paroi 3 du tronçon de gaine lb . II va de soi que l'aile 15 peut s'étendre parallèlement à la paroi 3 du tronçon lb de telle sorte que la distance séparant ladite aile 15 et la paroi 3 ne soit que de quelques millimètres sans pour autant nuire à la rigidité du profil 6 et donc à son efficacité. L'aile 15 est enfin prolongée par un repli intérieur 17, obtenu par un dernier pliage 18, parallèle aux précédents, toujours vers l'intérieur du profil 6 de manière à ce qu'il s'étende globalement parallèlement à la face interne du bord d'appui 9 pour que, lors du jointoiement des deux tronçons de gaine la et lb, les pièces d'angle 7 contraignent le repli intérieur 17 sur la face interne dudit bord d'appui 9 fermant totalement le profil 6 sur lui même pour procurer un effet de poutre particulièrement rigide et solide comme on peut le voir sur la figure 5.The section 1a of a sheath is connected to a second section 1b, shown in FIGS. 1 and 5, by a flange connection device 2. Each section of sheaths a and 1b has four flat walls 3, conventionally made of sheet metal, which extend perpendicularly to each other by virtue of folds 4 at right angles determining for each section of sheaths la and lb a generally rectangular section. Furthermore, each section 1a and 1b has at least one free end 5 corresponding to the ends of their walls 3 and situated in a plane perpendicular to the longitudinal axis of symmetry A of said sections 1a and 1b. Naturally, the connection of sections la and lb. is done by bringing their corresponding free ends 5 positioned opposite one another before being secured by the flange connection device 2. With reference to FIGS. 1 and 5, this device consists of hollow profiles 6 extending transversely along the ends of each wall 3 towards the outside of the sections 1a and 1b, of pieces of angles 7 and possibly of a cover or joint cover 8 as will be seen below. The hollow profile 6, with reference to FIG. 2, includes a bearing edge 9 obtained by a first fold 10, for example in the sheet coming from one of the walls 3 of the section lb, extending outwards of said section 1b along its free end 5, that is to say along the ends of each of its walls 3, perpendicular to its longitudinal axis of symmetry A so that, when the two sections of sheaths are joined together and 1b, the bearing edges 9 of the corresponding hollow profiles 6 are joined. The bearing edge 9 is extended by a wing 11 extending towards the sheath section, obtained by a second bending 12 of the sheet, parallel to the bending 10, and forming an acute angle, for example of 45 °, with said bearing edge 9. The wing 11 is extended by a second wing 13 obtained by a third fold 14, parallel to the previous ones and in the same direction as the previous folds 10 and 12, that is to say towards the inside of the profile 6. The wing 13 is also extended by a wing 15, obtained by a fourth folding 16, parallel to the previous ones, towards the inside of the profile 6, extending generally parallel to the wall 3 of the section lb towards the bearing edge 9 so that said wing 15 is in contact with the wall 3 of the sheath section lb. It goes without saying that the wing 15 can extend parallel to the wall 3 of the section lb so that the distance separating said wing 15 and the wall 3 is only a few millimeters without affecting the rigidity of the profile. 6 and therefore its effectiveness. The wing 15 is finally extended by an internal fold 17, obtained by a final folding 18, parallel to the previous ones, always towards the inside of the profile 6 so that it extends generally parallel to the internal face of the edge. support 9 so that, when the two sheath sections 1a and 1b are joined, the corner pieces 7 constrain the internal fold 17 on the internal face of said support edge 9 completely closing the profile 6 on itself to provide a particularly rigid and solid beam effect as can be seen in FIG. 5.
Naturellement, les profils creux 6 peuvent comprendre un renfoncement obtenu par un pliage vers l'extérieur du profil pour obtenir un profil particulier permettant de recevoir, par exemple, un organe de protection tel qu'un couvre-joint ou analogue.Naturally, the hollow profiles 6 may include a recess obtained by folding the profile outward to obtain a particular profile making it possible to receive, for example, a protective member such as a joint cover or the like.
Par ailleurs, les profils creux 6 peuvent également être formés par pliages successifs comme décrit au dessus à partir de plaques de tôles indépendantes. Ils forment alors des profilés individuels constituant, par un assemblage préliminaire au moyen de pièces d'angle 7, des cadres raidisseurs qui s'adaptent classiquement aux extrémités libres 5 des tronçons de gaine la et lb par soudage par exemple . Selon une première variante du dispositif de liaison conforme à l'invention, les pièces d'angle 7, en référence aux figures 4 et 5, sont des pièces coudées en équerre globalement planes, en métal, d'une épaisseur de quelques millimètres présentant une plaque médiane 19 reliant deux branches 20,21 qui peuvent se glisser respectivement dans les creux de deux profils 6 voisins d'un même tronçon de gaine là ou lb. Les branches 20,21 s'étendent de part et d'autre de la plaque médiane 19 dans le même plan et sur une égale distance de sorte que les pièces d'angle 7 présentent un axe de symétrie B, qui s'étend dans le plan formé par lesdites branches 20,21, représenté en traits pointillés sur la figure 4, pour pouvoir être introduites dans les creux de deux profils 6 voisins quelconques. La plaque médiane 19 comprend, par ailleurs, dans sa partie centrale un trou 22 pour accueillir des moyens de serrage tels qu'un boulon par exemple. Le trou 22 est de préférence centré sur l'axe de symétrie B pour répartir uniformément sur les deux branches 20,21 les forces dues au serrage des pièces d'angle 7, l'une contre l'autre, lors du raccord de deux tronçons de gaines la et lb (figure 5) .Furthermore, the hollow profiles 6 can also be formed by successive folds as described above from independent sheet plates. They then form individual profiles constituting, by a preliminary assembly by means of corner pieces 7, stiffening frames which conventionally adapt to the free ends 5 of the sheath sections 1a and 1b by welding for example. According to a first variant of the connection device according to the invention, the corner pieces 7, with reference to FIGS. 4 and 5, are generally flat angled square pieces of metal, a thickness of a few millimeters having a middle plate 19 connecting two branches 20,21 which can slide respectively in the hollows of two profiles 6 neighbors of the same section of sheath there or lb. The branches 20, 21 extend on either side of the central plate 19 in the same plane and over an equal distance so that the corner pieces 7 have an axis of symmetry B, which extends in the plane formed by said branches 20,21, shown in dotted lines in Figure 4, to be able to be introduced into the hollows of two profiles 6 any neighbors. The central plate 19 furthermore comprises, in its central part, a hole 22 for receiving clamping means such as a bolt for example. The hole 22 is preferably centered on the axis of symmetry B to distribute uniformly over the two branches 20,21 the forces due to the tightening of the corner pieces 7, one against the other, when connecting two sections of ducts 1a and 1b (FIG. 5).
Les branches 20,21 comprennent, par ailleurs, un décrochement 23, obtenu par un emboutissage desdites branches 20,21, s ' étendant longitudinalement sur une partie de leur longueur de manière que, lors du jointoiement des deux tronçons de gaine la et lb, chaque branche 20,21 soit en contact simultanément avec le repli intérieur 17 et la face interne du bord d'appui 9 du profil creux 6 correspondant comme 1 ' indique la figure 5. De plus, chaque branche 20,21 comprend, sur la même face que le décrochement 23, un bossage 24 de section globalement triangulaire s ' étendant longitudinalement sur une partie de sa longueur de sorte que ledit bossage 24 épouse une partie de la surface interne lorsque les branches 20,21 des pièces d'angle 7 sont introduites dans les creux desdits profils 6 pour assurer une plus grande rigidité aux profils 6.The branches 20, 21 also include a recess 23, obtained by stamping said branches 20, 21, extending longitudinally over part of their length so that, when the two sheath sections 1a and 1b are joined, each branch 20,21 is in contact simultaneously with the internal fold 17 and the internal face of the bearing edge 9 of the corresponding hollow profile 6 as 1 'indicates in Figure 5. In addition, each branch 20,21 comprises, on the same face that the recess 23, a boss 24 of generally triangular section extending longitudinally over a part of its length so that said boss 24 matches a part of the internal surface when the branches 20, 21 of the corner pieces 7 are introduced in the hollows of said profiles 6 to ensure greater rigidity in the profiles 6.
Les branches 20,21 des pièces d'angle 7, telles que décrites précédemment, sont positionnées dans les creux respectifs de deux profils 6 voisins lors de la fabrication des tronçons de gaine la et lb. En effet, les tronçons là et lb sont alors respectivement obtenus à partir de quatre plaques rectangulaires 3 de tôle aux extrémités transversales desquelles ont été formés des profils creux , tels que décrits précédemment. Les branches 20,21 des pièces d'angles 7 sont alors glissées dans les creux respectifs de deux profils 6 de deux plaques 3 à chacune de leurs extrémités puis, lesdites plaques 3 sont jointes par agrafage, par exemple, formant ainsi un angle droit pour finalement obtenir un tronçon de gaine de section rectangulaire .The branches 20,21 of the corner pieces 7, such as described above, are positioned in the respective recesses of two neighboring profiles 6 during the manufacture of the sheath sections 1a and 1b. Indeed, the sections there and lb are then respectively obtained from four rectangular sheets 3 of sheet metal at the transverse ends of which hollow profiles have been formed, as described above. The branches 20, 21 of the corner pieces 7 are then slid into the respective hollows of two profiles 6 of two plates 3 at each of their ends, then, said plates 3 are joined by stapling, for example, thus forming a right angle for finally obtain a sheath section of rectangular section.
Selon une seconde variante du dispositif de liaison conforme à l'invention, les pièces d'angle 7, en référence aux figures 3 et 5, sont constituées à partir de deux plaques globalement planes de quelques millimètres d'épaisseur formant deux branches 20,21 distinctes s ' imbriquant l'une dans l'autre à leurs extrémités selon un angle droit. Chaque branche 20,21 comprend à l'une de ses extrémités une zone d'imbrication 25, respectivement 26, globalement carrée, classiquement obtenue par emboutissage, comprenant respectivement un trou 27 et 28 en leurs centres de sorte que, les zones d'imbrication 25,26 respectives des branches 20,21 étant mises en contact, le trou 27 soit exactement au droit du trou 28 pour recevoir des moyens de solidarisation tels qu'un rivet, un boulon ou analogue et que les branches 20,21 soient bloquées en rotation et en translation l'une par rapport à l'autre. Par ailleurs, la branche 21 comprend au bord de la zone d'imbrication 26 un décrochement 29, également obtenu par emboutissage, de sorte que les branches 20,21 s'étendent dans un même plan lorsqu'elles sont assemblées.According to a second variant of the connection device according to the invention, the corner pieces 7, with reference to FIGS. 3 and 5, are formed from two generally flat plates a few millimeters thick forming two branches 20,21 distinct overlapping each other at their ends at a right angle. Each branch 20, 21 comprises at one of its ends a nesting zone 25, respectively 26, generally square, conventionally obtained by stamping, comprising respectively a hole 27 and 28 in their centers so that the nesting zones 25.26 respectively of the branches 20,21 being brought into contact, the hole 27 is exactly in line with the hole 28 to receive securing means such as a rivet, a bolt or the like and that the branches 20,21 are blocked in rotation and translation relative to each other. Furthermore, the branch 21 comprises at the edge of the nesting zone 26 a recess 29, also obtained by stamping, so that the branches 20, 21 extend in the same plane when they are assembled.
De la même manière que pour les pièces d'angle 7 en forme de pièce coudée, les branches 20,21 comprennent, par ailleurs, un décrochement 23, obtenu par un emboutissage desdites branches 20,21, s ' étendant longitudinalement sur une partie de leur longueur de manière que, lors du jointoiement des deux tronçons de gaine là et lb_, chaque branche 20,21 soit en contact simultanément avec le repli intérieur 17 et la face interne du bord d'appui 9 du profil creux 6 correspondant comme 1 ' indique la figure 5. Selon une caractéristique supplémentaire, chaque branche 20,21 comprend, sur la même face que le décrochement, un bossage 24 de section triangulaire s ' étendant longitudinalement sur une partie de sa longueur de sorte que ledit bossage 24 épouse une partie de la surface interne lorsque les branches 20,21 des pièces d'angle 7 sont introduites dans les creux desdits profils 6 pour assurer une plus grande rigidité aux profils 6.In the same way as for the corner pieces 7 in the form of a bent piece, the branches 20,21 further comprise a recess 23, obtained by stamping said branches 20,21, extending longitudinally over a part of their length so that when jointing of the two sections of sheath there and lb_, each branch 20, 21 is in contact simultaneously with the internal fold 17 and the internal face of the bearing edge 9 of the corresponding hollow profile 6 as 1 'indicates in FIG. 5. According to a characteristic additional, each branch 20, 21 comprises, on the same face as the recess, a boss 24 of triangular section extending longitudinally over part of its length so that said boss 24 follows a part of the internal surface when the branches 20 , 21 of the corner pieces 7 are introduced into the hollows of said profiles 6 to ensure greater rigidity in the profiles 6.
Avantageusement, le dispositif de liaison 2 comprend enfin, en référence aux figures 1 et 5, un joint 30, classiquement élastique, positionné entre les bords d'appui respectifs de deux profils 6 (figure 5) pour parfaire 1 ' étanchéité lors du jointoiement des deux tronçons de gaine la et lb- Il comprend également un couvre joint 8 comprenant des éléments droits 31 et des éléments coudés 32 de sections globalement polygonales aptes à être clipser sur deux profils joints pour protéger la liaison contre les infiltrations d'eau extérieure.Advantageously, the connection device 2 finally comprises, with reference to FIGS. 1 and 5, a seal 30, conventionally elastic, positioned between the respective bearing edges of two profiles 6 (FIG. 5) to perfect the seal during the jointing of the two sheath sections 1a and 1b- It also includes a joint cover 8 comprising straight elements 31 and bent elements 32 of generally polygonal sections capable of being clipped onto two joined profiles to protect the connection against infiltration of external water.
Il va de soi que le dispositif de liaison à bride conforme à 1 ' invention peut être adapté à tous les types de gaines, conduits ou analogues, tels que des gaines de section polygonale et que les exemples que l'on vient de donner ne sont que des illustrations particulières en aucun cas limitatives des domaines d'application de l'invention. It goes without saying that the flange connection device according to the invention can be adapted to all types of sheaths, conduits or the like, such as sheaths of polygonal cross section and that the examples which have just been given are not as particular illustrations which in no way limit the fields of application of the invention.

Claims

REVENDICATIONS
1 -Dispositif de liaison à bride à haute rigidité pour jonctionner des tronçons de gaine (la.,lb), par exemple, des gaines de ventilation, des tronçons de conduit ou analogues, de sections polygonales comprenant des profils creux (6) s ' étendant vers l'extérieur des gaines (la,lb), chaque profil (6) comprenant un bord d'appui (9) de sorte que, lors du jointoiement de deux tronçons de gaine (la,lb), les bords d'appui (9) des profils (6) correspondants soient joints, et lesdits profils creux (6) coopérant avec des pièces d'angle (7) introduites dans les creux respectifs de deux profils (6) voisins d'un même tronçon de gaine (la,lb) caractérisé en ce que chaque profil creux (6) résulte d'un enroulement de tôle par cinq pliages successifs (10,12,14,16,18) globalement dans le même sens et vers 1 ' intérieur du profil (6), de sorte qu'un capot (8) de section polygonale, soit apte à être clipsé sur deux profils (6) joints, que la section transversale du profil (6) soit globalement fermée et que ledit profil (6) ait au moins un repli intérieur (17) qui s'étende parallèlement à la face interne du bord d'appui (9) pour que, lors du jointoiement de deux tronçons de gaine (la,lb), les pièces d'angle (7) contraignent le repli intérieur (17) sur la face interne dudit bord d'appui (9) fermant totalement le profil (6) sur lui-même procurant ainsi une poutre rigide assurant une étanchéité parfaite de la liaison.1 -High rigidity flange connection device for joining duct sections (la., Lb), for example, ventilation ducts, duct sections or the like, of polygonal sections comprising hollow profiles (6) s' extending towards the outside of the sheaths (la, lb), each profile (6) comprising a support edge (9) so that, when joining two sections of sheath (la, lb), the support edges (9) corresponding profiles (6) are joined, and said hollow profiles (6) cooperating with corner pieces (7) introduced into the respective hollows of two profiles (6) neighboring a same section of sheath (the , lb) characterized in that each hollow profile (6) results from a winding of sheet metal by five successive folds (10,12,14,16,18) generally in the same direction and towards the interior of the profile (6) , so that a cover (8) of polygonal section is able to be clipped onto two joined profiles (6), so that the cross section of the profile (6) is g generally closed and that said profile (6) has at least one internal fold (17) which extends parallel to the internal face of the bearing edge (9) so that, when jointing two sections of sheath (la, lb ), the corner pieces (7) constrain the internal fold (17) on the internal face of said bearing edge (9) completely closing the profile (6) on itself thus providing a rigid beam ensuring a perfect seal of the link.
2 - Dispositif selon la revendication 1 caractérisé en ce que les profils creux (6) sont issus et formés à partir d'au moins une des extrémités libres (5) des tronçons de gaine (lâ/lb) •2 - Device according to claim 1 characterized in that the hollow profiles (6) come from and formed from at least one of the free ends (5) of the sheath sections (la / lb) •
3 - Dispositif selon l'une quelconque des revendications 1 ou 2 caractérisé en ce que les pièces d'angles (7) sont des pièces coudées globalement planes en métal d'une épaisseur de quelques millimètres présentant une plaque médiane (19) reliant deux branches (20,21) qui peuvent se glisser respectivement dans les creux de deux profils (6) voisins d'un même tronçon de gaine (la,lb) . 4 - Dispositif selon l'une quelconque des revendications 1 ou 2 caractérisé en ce que les pièces d'angles (7) sont constituées à partir de deux branches (20,21) distinctes globalement planes s ' imbriquant l'une dans l'autre à leurs extrémités selon un angle déterminé et solidarisées, après leur introduction dans deux profils creux (6) voisins d'un même tronçon de gaine (la,lb), avec la pièce d'angle (7) correspondante par un rivet, un boulon ou par emboutissage. 5 - Dispositif selon l'une quelconque des revendications 3 ou 4 caractérisé en ce que chaque branche (20,21) comprend un décrochement (23) s ' étendant au moins sur une partie de sa longueur de telle sorte que, lors du jointoiement, chaque branche (20,21) soit en contact simultanément avec le repli intérieur (17) et la face interne du bord d'appui (9) du profil creux (6) correspondant .3 - Device according to any one of claims 1 or 2 characterized in that the corner pieces (7) are generally flat bent pieces of metal with a thickness of a few millimeters having a middle plate (19) connecting two branches (20,21) which can slide respectively in the hollows of two profiles (6) neighboring a same section of sheath (la, lb). 4 - Device according to any one of claims 1 or 2 characterized in that the corner pieces (7) are formed from two branches (20,21) distinct generally planar overlapping one in the other at their ends at a determined angle and secured, after their introduction into two hollow profiles (6) neighboring a same section of sheath (la, lb), with the corresponding corner piece (7) by a rivet, a bolt or by stamping. 5 - Device according to any one of claims 3 or 4 characterized in that each branch (20,21) comprises a recess (23) extending at least over part of its length so that, when jointing, each branch (20,21) is in contact simultaneously with the internal fold (17) and the internal face of the bearing edge (9) of the corresponding hollow profile (6).
6 - Dispositif selon l'une quelconque des revendications 3 à 5 caractérisé en ce que chaque branche (20,21) comprend, sur au moins l'une de ses faces, un bossage (24) de section polygonale s ' étendant au moins sur une partie de sa longueur de telle sorte qu'il épouse une partie au moins de la surface interne d'un profil (6) lorsque les branches (20,21) des pièces d'angle (7) sont introduites dans le creux dudit profil (6) .6 - Device according to any one of claims 3 to 5 characterized in that each branch (20,21) comprises, on at least one of its faces, a boss (24) of polygonal section extending at least over a part of its length so that it matches at least part of the internal surface of a profile (6) when the branches (20,21) of the corner pieces (7) are introduced into the hollow of said profile (6).
7 - Dispositif selon l'une quelconque des revendications précédentes caractérisé en ce qu'il comprend un capot (8) de section polygonale, formant un couvre- joint, apte à être clipser sur deux profils (6) joints pour protéger la liaison contre les infiltrations d'eau extérieure . 7 - Device according to any one of the preceding claims, characterized in that it comprises a cover (8) of polygonal section, forming a joint cover, capable of being clipped onto two profiles (6) joints to protect the connection against outside water infiltration.
EP00948071A 1999-07-01 2000-07-03 High rigidity flange connection device Withdrawn EP1198687A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9908479 1999-07-01
FR9908479A FR2795802B1 (en) 1999-07-01 1999-07-01 HIGH RIGIDITY FLANGE CONNECTION DEVICE
PCT/FR2000/001886 WO2001002777A1 (en) 1999-07-01 2000-07-03 High rigidity flange connection device

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EP1198687A1 true EP1198687A1 (en) 2002-04-24

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EP00948071A Withdrawn EP1198687A1 (en) 1999-07-01 2000-07-03 High rigidity flange connection device

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EP (1) EP1198687A1 (en)
AU (1) AU6165100A (en)
FR (1) FR2795802B1 (en)
WO (1) WO2001002777A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2247880B1 (en) * 2003-08-04 2007-05-01 Talleres Bensa, S.L. VENTILATION CONDUCT WITH INCORPORATED UNION BOARD.
DE102005008604A1 (en) * 2005-02-23 2006-08-24 Smitka, Günter System for connecting climatization channels consisting of channel pieces connected together by flange frames made of sections and corner angles avoiding the high labour intensity of previous systems
DE102005042016B3 (en) * 2005-09-02 2007-01-11 Ing.-Büro H. Prechtl KG Anlagentechnik Corner angle system for connecting flange sections of sheet metal channel sections comprises a first side element having a flared flange formed with a locking nub and a second side element lying on a longitudinal edge with a locking recess
DE102007012015B3 (en) * 2007-03-13 2008-07-17 Ing.-Büro H. Prechtl KG Anlagentechnik Corner bracket system for connecting flange sections of sheet metal channel has angles of both leg parts of same depth corresponding to half their wall thickness; both leg parts with same edge contours have latching pimples and recesses
MA33182B1 (en) * 2009-03-05 2012-04-02 Hermanussen Metallverarbeitung Gmbh A connecting piece formed for a tight connection to air duct air
CN107605894B (en) * 2017-09-07 2023-11-07 佛山市南海九洲普惠风机有限公司 Fan box flange

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Publication number Priority date Publication date Assignee Title
US4410206A (en) * 1981-05-11 1983-10-18 Mez-Technik A.G. Flange connection for rectangular air-conditioning ducts
GB2162269A (en) * 1984-07-25 1986-01-29 Lockformer The Company Duct connecting system
CH680873A5 (en) * 1990-02-12 1992-11-30 Dresohn Ag Air duct with connection flange to air shaft - has flange with four legs, forming triangle, with one leg clamped between two others

Non-Patent Citations (1)

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Title
See references of WO0102777A1 *

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WO2001002777A1 (en) 2001-01-11
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FR2795802B1 (en) 2001-08-17

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