WO2005050053A1 - Energy-absorption device comprising head-to-foot conical elements - Google Patents

Energy-absorption device comprising head-to-foot conical elements Download PDF

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Publication number
WO2005050053A1
WO2005050053A1 PCT/FR2004/002867 FR2004002867W WO2005050053A1 WO 2005050053 A1 WO2005050053 A1 WO 2005050053A1 FR 2004002867 W FR2004002867 W FR 2004002867W WO 2005050053 A1 WO2005050053 A1 WO 2005050053A1
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WO
WIPO (PCT)
Prior art keywords
plate
conical elements
conical
elements
base
Prior art date
Application number
PCT/FR2004/002867
Other languages
French (fr)
Inventor
Damien Demulder
Original Assignee
Faurecia Interieur Industrie
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.)
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Publication date
Application filed by Faurecia Interieur Industrie filed Critical Faurecia Interieur Industrie
Priority to EP04805410A priority Critical patent/EP1682793A1/en
Publication of WO2005050053A1 publication Critical patent/WO2005050053A1/en

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Classifications

    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F3/00—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic
    • F16F3/08—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of a material having high internal friction, e.g. rubber
    • F16F3/087—Units comprising several springs made of plastics or the like material
    • F16F3/0873—Units comprising several springs made of plastics or the like material of the same material or the material not being specified
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
    • F16F7/121—Vibration-dampers; Shock-absorbers using plastic deformation of members the members having a cellular, e.g. honeycomb, structure

Definitions

  • the invention relates to an energy absorption device in the event of an impact of the type comprising two plates, each comprising conical elements.
  • the document US Pat. No. 4,025,063 describes a damping device comprising solid conical elements formed from a non-rigid, but elastic material.
  • Document US Pat. No. 3,251,076 describes a damping device comprising two plates having telescopic elements delimiting pneumatic chambers in which air is compressed when the plates approach.
  • Document JP - 2003118670 a damping device having walls perpendicular to a support plate and the thickness of which decreases more and more away from the plate.
  • the document JP-63219926 describes a conical punctual damping device placed between two structures.
  • the invention relates to an energy absorption device in the event of an impact of the type comprising a first and a second plate each comprising a base, and hollow conical elements protrude from at least one plate and have a conical outer surface s 'extending in size from the base to a free end.
  • the invention aims to increase the reliability of such a device, in particular by giving great consistency in shock absorption, without significantly increasing the complexity and therefore the price of such a device.
  • the other plate has cavities delimited by an envelope surface closely corresponding to the external surface of the conical elements of the first plate in the immediate vicinity of the free end, this external surface of the conical elements of the first plate coming, in the immediate vicinity of their free end, in contact with the envelope surface of the cavities of the other plate, so that the conical elements of the first plate are tightly held by the envelope surface of the cavities of the second plate; in addition, at least two conical elements of at least one plate have different sections near at least one end chosen from their base end and their free end.
  • the conical elements are well maintained during an impact, and their behavior is not very sensitive to the direction of the force applied to the device during the impact.
  • the device comprises holding elements projecting relative to the base of the other plate, these holding elements each having a flared shape complementary to the external surface of the conical elements in the immediate vicinity from their free end, the flared shape defining the envelope surface delimiting the cavity.
  • the envelope surface of the holding elements extends in a main direction to the base of the other plate and the base of the other plate closes the cavities at one end following the main direction.
  • the conical elements of the first plate are not likely to pass through the other plate.
  • the device has the following characteristics: - the other plate comprises conical elements having a conical outer surface extending in thinning from the base to a free end, so that the conical elements of the first plate and the conical elements of the other plate are arranged head to tail, - the first plate comprises cavities delimited by an envelope surface closely corresponding to the external surface of the conical elements of the other plate in the immediate vicinity of this free end, the external surface of the conical elements of the other plate coming in the immediate vicinity of their free end in contact with the surface covering the cavities of the first plate, so that the conical elements of the other plate are tightly held by the envelope surface of the cavities of the first plate.
  • the head-to-tail arrangement makes it possible to substantially double their number for the same size of the device.
  • the stiffness of the device can thus be easily increased without recourse to expensive materials.
  • the stiffness is very constant, or at least very finely adjusted to the desired value on the entire device.
  • the conical elements of the other plate and the conical elements of the first plate are distant. Thus, the deformation of a conical element is unlikely to damage the adjacent conical element.
  • the figures illustrate a device 1 essentially comprising a first plate 2 and a second plate 12 obtained from molding in one piece and connected by a film hinge 48.
  • the first plate 2 comprises a base 4 substantially planar from which stands conical elements 6 tapering to a free end 10, in a main direction 50 substantially perpendicular to the base 4.
  • the second plate 12 also comprises a base 14 substantially planar, substantially parallel to base 4 of the first plate 2.
  • Conical elements 26 having an outer surface 28 stand up from the base 14, tapering to a free end 30, substantially in the main direction 50.
  • the second plate 12 further comprises annular ribs 16 erecting the base 14 between the conical elements 26.
  • annular ribs 16 have a substantially conical flared envelope surface 18, constituting their internal surface and extending substantially in the main direction 50. Said envelope surface 18 is complementary to the external surface 8 conical elements 6 of the first plate 2 near their free end 10.
  • the envelope surface 18 of each of the annular ribs 16 delimits a cavity 20, the base 14 of which closes one end in the main direction 50.
  • the free end 10 of each of the conical elements 6 is inserted into a cavity 20, so that the envelope surface 18 of the annular rib 16 comes closely into contact with the outer surface 8 of the corresponding conical element 6, near its free end 10, in order to hold it tightly.
  • a clearance is provided between the free end 10 of the conical elements 6 and the base 14 to ensure the contact described above.
  • the first plate 2 further comprises annular ribs 36 rising from the base 4 between the conical elements 6.
  • These annular ribs 36 have a flared envelope surface 38, substantially conical, extending substantially in the main direction 50
  • Said envelope surface 38 is complementary to the external surface 28 of the conical elements 26 of the second plate 12 near their free end 30.
  • the envelope surface 38 of each of the annular ribs 36 delimits a cavity 40 the base 4 of which closes one end in the main direction 50.
  • the free end 30 of each of the conical elements 26 is inserted into a cavity 40, so that the envelope surface 38 of the annular rib 36 comes closely into contact with the outer surface 28 of the corresponding conical element 26, near its free end 30, in order to hold it tightly.
  • a clearance is provided between the free end 30 of the conical elements 26 and the base 4 to ensure the contact described above.
  • the conical elements 6 of the first plate 2 are arranged between the conical elements 26 of the second plate 12 and vice versa so that the conical elements 6 of the first plate 2 and the conical elements 26 of the second plate 12 are arranged head to tail .
  • the conical elements 6 of the first plate 2 and the conical elements 26 of the second plate 12 are distant. As illustrated in FIG. 2, all the conical elements 6, 26 do not have the same sections, either near the base 4, 14 or the free end 10, 30, as indicated by the conical elements 6a and 6b. In addition, they do not all have the same angle of conicity, in order to adapt the resistance of the conical elements 6, 26 if necessary.
  • the annular ribs 16, 36 of each of the plates 2, 12 and in particular the envelope surfaces 18, 38 extend in the main direction 50 over a height h relative to the corresponding base 14, 4 advantageously included between 5% and 25% of the height H of the conical elements 6, 26 which they maintain, this height H corresponding to the distance between the free end 10, 30 and the corresponding base 4, 14 in the main direction 50.
  • the height h of the annular grooves 16, 36 is advantageously between 5 mm and 15 mm for a height H of the conical elements 6, 26 between 60 mm and 100 mm.
  • the conical elements 6, 26 have a substantially constant thickness over their entire height, but the thickness e, e 'of some of the conical elements differs, for example as indicated for the conical elements 6a and 6b of FIG. 2.
  • they are hollow and have a cavity 44, 46 open at each end in the main direction 50.
  • the invention is in no way limited to the embodiment which has just been described by way of nonlimiting example.
  • the cavities 20, 40 could be produced simply by drilling the corresponding bases 4, 14.

Abstract

The invention relates to device (1) which is used to absorb energy in the event of an impact and which comprises first and second plates. The first plate (2) comprises a base (4) having conical elements (6) extending therefrom. The second plate (12) comprises a base (14) and cavities (20) which are defined by a peripheral surface (18) corresponding closely to the outer surface (8) of the conical elements (6) of the first plate (2) immediately adjacent to the free end (10) of said conical elements. Moreover, the outer surface (8) of the conical elements (6) of the first plate (2) comes into contact with the peripheral surface (18) of the cavities (20) of the second plate (12) immediately adjacent to the free end (10) thereof, such that the conical elements (6) of the first plate (2) are held tightly by the peripheral surface (18) of the cavities (20) of the second plate (12).

Description

Dispositif d'absorption d'énergie à éléments coniques tête-bêche L'invention concerne un dispositif d'absorption d'énergie en cas de choc du type comprenant deux plaques comportant chacune des éléments coniques. Le document US — 4 025 063 décrit un dispositif d'amortissement comprenant des éléments coniques pleins formés d'un matériau non rigide, mais élastique. Le document US — 3 251 076 décrit un dispositif d'amortissement comprenant deux plaques ayant des éléments télescopiques délimitant des chambres pneumatiques dans lesquelles de l'air est comprimé lorsque les plaques se rapprochent. Le document JP — 2003118670 un dispositif d'amortissement ayant des parois perpendiculaire à une plaque de support et dont l'épaisseur diminue de plus en plus à distance de la plaque. Le document JP — 63219926 décrit un dispositif ponctuel conique d'amortissement placé entre deux structures. L'invention concerne un dispositif d'absorption d'énergie en cas de choc du type comprenant une première et une deuxième plaque comportant chacune une base, et des éléments coniques creux font saillie d'une plaque au moins et présentent une surface extérieure conique s'étendant en s'affinant depuis la base jusqu'à une extrémité libre. L'invention a pour but d'accroître la fiabilité d'un tel dispositif, en particulier en donnant une grande constance dans l'absorption des chocs, sans augmenter notablement la complexité et donc le prix d'un tel dispositif. Conformément à l'invention, l'autre plaque présente des cavités délimitées par une surface enveloppe correspondant étroitement à la surface extérieure des éléments coniques de la première plaque à proximité immédiate de l'extrémité libre, cette surface extérieure des éléments coniques de la première plaque venant, à proximité immédiate de leur extrémité libre, au contact de la surface enveloppe des cavités de l'autre plaque, de sorte que les éléments coniques de la première plaque sont étroitement maintenus par la surface enveloppe des cavités de la deuxième plaque ; en outre, au moins deux éléments coniques d'une plaque au moins présentent des sections différentes à proximité d'au moins une extrémité choisie parmi leur extrémité de base et leur extrémité libre. Ainsi, les éléments coniques sont bien maintenus lors d'un choc, et leur comportement est peu sensible à la direction de l'effort appliqué au dispositif lors du choc. On peut par conséquent obtenir un effort résistant très proche de la résistance physique humaine pour une grande variété de chocs. Selon une caractéristique avantageuse de l'invention, le dispositif comprend des éléments de maintien venant en saillie par rapport à la base de l'autre plaque, ces éléments de maintien présentant chacun une forme évasée complémentaire de la surface extérieure des éléments coniques à proximité immédiate de leur extrémité libre, la forme évasée définissant la surface enveloppe délimitant la cavité. Ainsi, on obtient un maintien particulièrement efficace des éléments coniques. En outre, le positionnement relatif des deux plaques est aisé. Conformément à une autre caractéristique avantageuse de l'invention, la surface enveloppe des éléments de maintien s'étend suivant une direction principale jusqu'à la base de l'autre plaque et la base de l'autre plaque obture les cavités à une extrémité suivant la direction principale. Ainsi, les éléments coniques de la première plaque ne risquent pas de passer à travers l'autre plaque. Afin d'améliorer la raideur (l'effort résistant) du dispositif, le dispositif présente les caractéristiques suivantes : - l'autre plaque comprend des éléments coniques présentant une surface extérieure conique s'étendant en s'affinant depuis la base jusqu'à une extrémité libre, de sorte que les éléments coniques de la première plaque et les éléments coniques de l'autre plaque sont disposés tête-bêche, - la première plaque comprend des cavités délimitées par une surface enveloppe correspondant étroitement à la surface extérieure des éléments coniques de l'autre plaque à proximité immédiate de cette extrémité libre, la surface extérieure des éléments coniques de l'autre plaque venant à proximité immédiate de leur extrémité libre au contact de la surface enveloppe des cavités de la première plaque, de sorte que les éléments coniques de l'autre plaque sont étroitement maintenus par la surface enveloppe des cavités de la première plaque. Compte tenu de la forme conique des éléments destinés à absorber le choc, la disposition tête-bêche permet sensiblement de doubler leur nombre pour un même encombrement du dispositif. La raideur du dispositif peut ainsi être aisément augmentée sans recours à des matériaux onéreux. En outre, la raideur est très constante, ou du moins très finement ajustée à la valeur désirée sur l'ensemble du dispositif. Selon une caractéristique avantageuse complémentaire, les éléments coniques de l'autre plaque et les éléments coniques de la première plaque sont distants. Ainsi, la déformation d'un élément conique risque peu de détériorer l'élément conique adjacent. L'invention apparaît clairement dans la description qui suit, faite en référence aux dessins annexés sur lesquels : - la figure 1 est une vue en perspective d'un dispositif conforme à l'invention, - la figure 2 est une vue en coupe suivant le plan repéré ll-ll sur la figure 1. Les figures illustrent un dispositif 1 comprenant essentiellement une première plaque 2 et une deuxième plaque 12 obtenues de moulage en une seule pièce et reliées par une charnière film 48. La première plaque 2 comprend une base 4 sensiblement plane de laquelle se dresse des éléments coniques 6 s'affinant jusqu'à une extrémité libre 10, suivant une direction principale 50 sensiblement perpendiculaire à la base 4. De manière similaire, la deuxième plaque 12 comprend également une base 14 sensiblement plane, sensiblement parallèle à la base 4 de la première plaque 2. Des éléments coniques 26 présentant une surface extérieure 28 se dressent de la base 14 en s'affinant jusqu'à une extrémité libre 30, sensiblement suivant la direction principale 50. La deuxième plaque 12 comprend en outre des nervures annulaires 16 se dressant de la base 14 entre les éléments coniques 26. Ces nervures annulaires 16 présentent une surface enveloppe 18 évasée sensiblement conique, constituant leur surface interne et s'étendant sensiblement suivant la direction principale 50. Ladite surface enveloppe 18 est complémentaire de la surface extérieure 8 des éléments coniques 6 de la première plaque 2 à proximité de leur extrémité libre 10. La surface enveloppe 18 de chacune des nervures annulaires 16 délimite une cavité 20 dont la base 14 obture une extrémité suivant la direction principale 50. L'extrémité libre 10 de chacun des éléments coniques 6 est insérée dans une cavité 20, de sorte que la surface enveloppe 18 de la nervure annulaire 16 vient étroitement au contact de la surface extérieure 8 de l'élément conique 6 correspondant, à proximité de son extrémité libre 10, afin de la maintenir étroitement. Un jeu est ménagé entre l'extrémité libre 10 des éléments coniques 6 et la base 14 pour assurer du contact décrit ci-dessus. De manière similaire, la première plaque 2 comprend en outre des nervures annulaires 36 se dressant de la base 4 entre les éléments coniques 6. Ces nervures annulaires 36 présentent une surface enveloppe 38 évasée, sensiblement conique, s'étendant sensiblement suivant la direction principale 50. Ladite surface enveloppe 38 est complémentaire de la surface extérieure 28 des éléments coniques 26 de la deuxième plaque 12 à proximité de leur extrémité libre 30. La surface enveloppe 38 de chacune des nervures annulaires 36 délimite une cavité 40 dont la base 4 obture une extrémité suivant la direction principale 50. L'extrémité libre 30 de chacun des éléments coniques 26 est insérée dans une cavité 40, de sorte que la surface enveloppe 38 de la nervure annulaire 36 vient étroitement au contact de la surface extérieure 28 de l'élément conique 26 correspondant, à proximité de son extrémité libre 30, afin de la maintenir étroitement. Un jeu est ménagé entre l'extrémité libre 30 des éléments coniques 26 et la base 4 pour s'assurer du contact décrit ci-dessus. Les éléments coniques 6 de la première plaque 2 sont disposés entre les éléments coniques 26 de la deuxième plaque 12 et inversement de sorte que les éléments coniques 6 de la première plaque 2 et les éléments coniques 26 de la deuxième plaque 12 sont disposés tête-bêche. En outre, les éléments coniques 6 de la première plaque 2 et les éléments coniques 26 de la deuxième plaque 12 sont distants. Tel qu'illustré à la figure 2, tous les éléments coniques 6, 26 ne présentent pas les mêmes sections, que ce soit à proximité de la base 4, 14 ou de l'extrémité libre 10, 30, comme indiqués par les éléments coniques 6a et 6b. En outre, ils ne présentent pas tous le même angle de conicité, afin d'adapter la résistance des éléments coniques 6, 26 au besoin. D'autre part, les nervures annulaires 16, 36 de chacune des plaques 2, 12 et en particulier les surfaces enveloppes 18, 38 s'étendent suivant la direction principale 50 sur une hauteur h par rapport à la base correspondante 14, 4 avantageusement comprise entre 5% et 25% de la hauteur H des éléments coniques 6, 26 qu'ils maintiennent, cette hauteur H correspondant à la distance entre l'extrémité libre 10, 30 et la base 4, 14 correspondante suivant la direction principale 50. Ainsi, la hauteur h des rainures annulaires 16, 36 est avantageusement comprise entre 5 mm et 15 mm pour une hauteur H des éléments coniques 6, 26 comprise entre 60 mm et 100 mm. Enfin, les éléments coniques 6, 26 présentent une épaisseur sensiblement constante sur toute leur hauteur, mais l'épaisseur e, e' de certains des éléments coniques diffère, par exemple comme indiqué pour les éléments coniques 6a et 6b de la figure 2. En outre, ils sont creux et présentent une cavité 44, 46 ouverte à chaque extrémité suivant la direction principale 50. Bien entendu, l'invention n'est nullement limitée à la réalisation qui vient d'être décrite à titre d'exemple non limitatif. Ainsi, bien qu'une telle réalisation soit moins avantageuse, on pourrait réaliser les cavités 20, 40 simplement en perçant les bases 4, 14 correspondantes. The invention relates to an energy absorption device in the event of an impact of the type comprising two plates, each comprising conical elements. The document US Pat. No. 4,025,063 describes a damping device comprising solid conical elements formed from a non-rigid, but elastic material. Document US Pat. No. 3,251,076 describes a damping device comprising two plates having telescopic elements delimiting pneumatic chambers in which air is compressed when the plates approach. Document JP - 2003118670 a damping device having walls perpendicular to a support plate and the thickness of which decreases more and more away from the plate. The document JP-63219926 describes a conical punctual damping device placed between two structures. The invention relates to an energy absorption device in the event of an impact of the type comprising a first and a second plate each comprising a base, and hollow conical elements protrude from at least one plate and have a conical outer surface s 'extending in size from the base to a free end. The invention aims to increase the reliability of such a device, in particular by giving great consistency in shock absorption, without significantly increasing the complexity and therefore the price of such a device. According to the invention, the other plate has cavities delimited by an envelope surface closely corresponding to the external surface of the conical elements of the first plate in the immediate vicinity of the free end, this external surface of the conical elements of the first plate coming, in the immediate vicinity of their free end, in contact with the envelope surface of the cavities of the other plate, so that the conical elements of the first plate are tightly held by the envelope surface of the cavities of the second plate; in addition, at least two conical elements of at least one plate have different sections near at least one end chosen from their base end and their free end. Thus, the conical elements are well maintained during an impact, and their behavior is not very sensitive to the direction of the force applied to the device during the impact. It is therefore possible to obtain a resisting force very close to human physical resistance for a wide variety of shocks. According to an advantageous characteristic of the invention, the device comprises holding elements projecting relative to the base of the other plate, these holding elements each having a flared shape complementary to the external surface of the conical elements in the immediate vicinity from their free end, the flared shape defining the envelope surface delimiting the cavity. Thus, a particularly effective maintenance of the conical elements is obtained. In addition, the relative positioning of the two plates is easy. According to another advantageous characteristic of the invention, the envelope surface of the holding elements extends in a main direction to the base of the other plate and the base of the other plate closes the cavities at one end following the main direction. Thus, the conical elements of the first plate are not likely to pass through the other plate. In order to improve the stiffness (the resisting force) of the device, the device has the following characteristics: - the other plate comprises conical elements having a conical outer surface extending in thinning from the base to a free end, so that the conical elements of the first plate and the conical elements of the other plate are arranged head to tail, - the first plate comprises cavities delimited by an envelope surface closely corresponding to the external surface of the conical elements of the other plate in the immediate vicinity of this free end, the external surface of the conical elements of the other plate coming in the immediate vicinity of their free end in contact with the surface covering the cavities of the first plate, so that the conical elements of the other plate are tightly held by the envelope surface of the cavities of the first plate. Given the conical shape of the elements intended to absorb the shock, the head-to-tail arrangement makes it possible to substantially double their number for the same size of the device. The stiffness of the device can thus be easily increased without recourse to expensive materials. In addition, the stiffness is very constant, or at least very finely adjusted to the desired value on the entire device. According to an additional advantageous characteristic, the conical elements of the other plate and the conical elements of the first plate are distant. Thus, the deformation of a conical element is unlikely to damage the adjacent conical element. The invention clearly appears in the following description, made with reference to the accompanying drawings in which: - Figure 1 is a perspective view of a device according to the invention, - Figure 2 is a sectional view along the plan marked ll-ll in FIG. 1. The figures illustrate a device 1 essentially comprising a first plate 2 and a second plate 12 obtained from molding in one piece and connected by a film hinge 48. The first plate 2 comprises a base 4 substantially planar from which stands conical elements 6 tapering to a free end 10, in a main direction 50 substantially perpendicular to the base 4. Similarly, the second plate 12 also comprises a base 14 substantially planar, substantially parallel to base 4 of the first plate 2. Conical elements 26 having an outer surface 28 stand up from the base 14, tapering to a free end 30, substantially in the main direction 50. The second plate 12 further comprises annular ribs 16 erecting the base 14 between the conical elements 26. These annular ribs 16 have a substantially conical flared envelope surface 18, constituting their internal surface and extending substantially in the main direction 50. Said envelope surface 18 is complementary to the external surface 8 conical elements 6 of the first plate 2 near their free end 10. The envelope surface 18 of each of the annular ribs 16 delimits a cavity 20, the base 14 of which closes one end in the main direction 50. The free end 10 of each of the conical elements 6 is inserted into a cavity 20, so that the envelope surface 18 of the annular rib 16 comes closely into contact with the outer surface 8 of the corresponding conical element 6, near its free end 10, in order to hold it tightly. A clearance is provided between the free end 10 of the conical elements 6 and the base 14 to ensure the contact described above. Similarly, the first plate 2 further comprises annular ribs 36 rising from the base 4 between the conical elements 6. These annular ribs 36 have a flared envelope surface 38, substantially conical, extending substantially in the main direction 50 Said envelope surface 38 is complementary to the external surface 28 of the conical elements 26 of the second plate 12 near their free end 30. The envelope surface 38 of each of the annular ribs 36 delimits a cavity 40 the base 4 of which closes one end in the main direction 50. The free end 30 of each of the conical elements 26 is inserted into a cavity 40, so that the envelope surface 38 of the annular rib 36 comes closely into contact with the outer surface 28 of the corresponding conical element 26, near its free end 30, in order to hold it tightly. A clearance is provided between the free end 30 of the conical elements 26 and the base 4 to ensure the contact described above. The conical elements 6 of the first plate 2 are arranged between the conical elements 26 of the second plate 12 and vice versa so that the conical elements 6 of the first plate 2 and the conical elements 26 of the second plate 12 are arranged head to tail . In addition, the conical elements 6 of the first plate 2 and the conical elements 26 of the second plate 12 are distant. As illustrated in FIG. 2, all the conical elements 6, 26 do not have the same sections, either near the base 4, 14 or the free end 10, 30, as indicated by the conical elements 6a and 6b. In addition, they do not all have the same angle of conicity, in order to adapt the resistance of the conical elements 6, 26 if necessary. On the other hand, the annular ribs 16, 36 of each of the plates 2, 12 and in particular the envelope surfaces 18, 38 extend in the main direction 50 over a height h relative to the corresponding base 14, 4 advantageously included between 5% and 25% of the height H of the conical elements 6, 26 which they maintain, this height H corresponding to the distance between the free end 10, 30 and the corresponding base 4, 14 in the main direction 50. Thus , the height h of the annular grooves 16, 36 is advantageously between 5 mm and 15 mm for a height H of the conical elements 6, 26 between 60 mm and 100 mm. Finally, the conical elements 6, 26 have a substantially constant thickness over their entire height, but the thickness e, e 'of some of the conical elements differs, for example as indicated for the conical elements 6a and 6b of FIG. 2. In in addition, they are hollow and have a cavity 44, 46 open at each end in the main direction 50. Of course, the invention is in no way limited to the embodiment which has just been described by way of nonlimiting example. Thus, although such an embodiment is less advantageous, the cavities 20, 40 could be produced simply by drilling the corresponding bases 4, 14.

Claims

Revendications claims
1. Dispositif (1 ) d'absorption d'énergie en cas de choc comprenant : - une première plaque (2) comportant une base (4) de laquelle font saillie des éléments coniques creux (6), les éléments coniques présentant une surface extérieure (8) conique s'étendant en s'affinant depuis la base jusqu'à une extrémité libre (10), et - une deuxième plaque (12) comportant une base (14), caractérisé en ce que la deuxième plaque présente des cavités (20) délimitées par une surface enveloppe (18) correspondant étroitement à la surface extérieure (8) des éléments coniques (6) de la première plaque (2) à proximité immédiate de ladite extrémité libre (10), la surface extérieure (8) des éléments coniques (6) de la première plaque (2) venant à proximité immédiate de leur extrémité libre (10) au contact de la surface enveloppe (18) des cavités (20) de la deuxième plaque (12), de sorte que les éléments coniques (6) de la première plaque (2) sont étroitement maintenus par la surface enveloppe (18) des cavités (20) de la deuxième plaque (12), et en ce qu'au moins deux éléments coniques (6a, 6b) de la première plaque (2) au moins présentent des sections différentes à proximité d'au moins une extrémité choisie parmi leur extrémité de base et leur extrémité libre (10). 1. Device (1) for absorbing energy in the event of impact comprising: - a first plate (2) comprising a base (4) from which protrude hollow conical elements (6), the conical elements having an outer surface (8) conical extending in finer form from the base to a free end (10), and - a second plate (12) comprising a base (14), characterized in that the second plate has cavities ( 20) delimited by an envelope surface (18) closely corresponding to the external surface (8) of the conical elements (6) of the first plate (2) in the immediate vicinity of said free end (10), the external surface (8) of the conical elements (6) of the first plate (2) coming close to their free end (10) in contact with the envelope surface (18) of the cavities (20) of the second plate (12), so that the elements conical (6) of the first plate (2) are closely maintained bare by the envelope surface (18) of the cavities (20) of the second plate (12), and in that at least two conical elements (6a, 6b) of the first plate (2) at least have different sections to proximity of at least one end chosen from their base end and their free end (10).
2. Dispositif selon la revendication 1 , caractérisé en ce qu'il comprend des éléments de maintien (16) venant en saillie par rapport à la base (14) de la deuxième plaque (12), les éléments de maintien (16) présentant chacun une forme évasée complémentaire de la surface extérieure (8) des éléments coniques (6) à proximité immédiate de leur extrémité libre (10), la forme évasée définissant la surface enveloppe (18) délimitant la cavité (20). 2. Device according to claim 1, characterized in that it comprises holding elements (16) projecting relative to the base (14) of the second plate (12), the holding elements (16) each having a flared shape complementary to the external surface (8) of the conical elements (6) in the immediate vicinity of their free end (10), the flared shape defining the envelope surface (18) delimiting the cavity (20).
3. Dispositif selon la revendication 2, caractérisé en que la surface enveloppe (18) des éléments de maintien (16) s'étend suivant une direction principale (30) jusqu'à la base (14) de la deuxième plaque (12) et la base (14) de la deuxième plaque (12) obture les cavités (20) à une extrémité suivant la direction principale (50). 3. Device according to claim 2, characterized in that the envelope surface (18) of the holding elements (16) extends in a main direction (30) to the base (14) of the second plate (12) and the base (14) of the second plate (12) closes the cavities (20) at one end in the main direction (50).
4. Dispositif selon la l'une quelconque des revendications précédentes, caractérisé en ce que : - la deuxième plaque (12) comprend des éléments coniques (26) présentant une surface extérieure (28) conique s'étendant en s'affinant depuis la base (14) jusqu'à une extrémité libre (30), de sorte que les éléments coniques (6) de la première plaque (2) et les éléments coniques (26) de la deuxième plaque (12) sont disposés tête-bêche, - la première plaque (2) comprend des cavités (40) délimitées par une surface enveloppe (38) correspondant étroitement à la surface extérieure (28) des éléments coniques (26) de la deuxième plaque (12) à proximité immédiate de l'extrémité libre (30), la surface extérieure (28) des éléments coniques (26) de la deuxième plaque (12) venant à proximité immédiate de leur extrémité libre (30) au contact de la surface enveloppe (38) des cavités (40) de la première plaque (2), de sorte que les éléments coniques (26) de la deuxième plaque (12) sont étroitement maintenus par la surface enveloppe (38) des cavités (40) de la première plaque (2). 4. Device according to any one of the preceding claims, characterized in that: - the second plate (12) comprises conical elements (26) having an outer conical surface (28) extending in refinement from the base (14) to a free end (30), so that the conical elements (6) of the first plate (2) and the conical elements (26) of the second plate (12) are arranged head to tail, - the first plate (2) comprises cavities (40) delimited by an envelope surface (38) closely corresponding to the external surface (28) of the conical elements (26) of the second plate (12) in the immediate vicinity of the free end (30), the outer surface (28) of the conical elements (26) of the second plate (12) coming in close proximity to their free end (30) in contact with the envelope surface (38) of the cavities (40) of the first plate (2), so that the conical elements (26) of the a second plate (12) are tightly held by the envelope surface (38) of the cavities (40) of the first plate (2).
5. Dispositif selon la revendication 4, caractérisé en ce que les éléments coniques (26) de la deuxième plaque (12) et les éléments coniques (6) de la première plaque (2) sont distants. 5. Device according to claim 4, characterized in that the conical elements (26) of the second plate (12) and the conical elements (6) of the first plate (2) are distant.
6. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les éléments de maintien (16) de la deuxième plaque (12) viennent en saillie par rapport à la base (14) d'une hauteur (h) représentant entre 5% et 25% de la hauteur (H) des éléments coniques de la première plaque constituée par la distance entre l'extrémité libre (10) des éléments coniques (6) et la base (4) de la première plaque (2). 6. Device according to any one of the preceding claims, characterized in that the holding elements (16) of the second plate (12) protrude relative to the base (14) by a height (h) representing between 5% and 25% of the height (H) of the conical elements of the first plate constituted by the distance between the free end (10) of the conical elements (6) and the base (4) of the first plate (2).
7. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins deux éléments coniques (6a, 6b) de la première plaque présentent des sections différentes à proximité de la base (4). 7. Device according to any one of the preceding claims, characterized in that at least two conical elements (6a, 6b) of the first plate have different sections near the base (4).
8. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins deux éléments coniques (6a, 6b) de la première plaque (2) présentent des sections différentes à proximité de leur extrémité libre (10). 8. Device according to any one of the preceding claims, characterized in that at least two conical elements (6a, 6b) of the first plate (2) have different sections near their free end (10).
9. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les éléments coniques (6) de la première plaque (2) sont creux et présentent une épaisseur (e ; e') sensiblement constante, et en ce qu'au moins deux éléments coniques de la première plaque présentent des épaisseurs différentes (e ; e'). 9. Device according to any one of the preceding claims, characterized in that the conical elements (6) of the first plate (2) are hollow and have a thickness (e; e ') substantially constant, and in that at at least two conical elements of the first plate have different thicknesses (e; e ').
10. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que la deuxième plaque (12) est obtenue de matière avec la première plaque (2), lesdites première (2) et deuxième (12) plaques étant reliées entre elles par une charnière film (48). 10. Device according to any one of the preceding claims, characterized in that the second plate (12) is obtained integrally with the first plate (2), said first (2) and second (12) plates being interconnected by a film hinge (48).
PCT/FR2004/002867 2003-11-14 2004-11-08 Energy-absorption device comprising head-to-foot conical elements WO2005050053A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04805410A EP1682793A1 (en) 2003-11-14 2004-11-08 Energy-absorption device comprising head-to-foot conical elements

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0313375 2003-11-14
FR0313375A FR2862362B1 (en) 2003-11-14 2003-11-14 ENERGY ABSORPTION DEVICE WITH CONE HEAD ELEMENTS

Publications (1)

Publication Number Publication Date
WO2005050053A1 true WO2005050053A1 (en) 2005-06-02

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Application Number Title Priority Date Filing Date
PCT/FR2004/002867 WO2005050053A1 (en) 2003-11-14 2004-11-08 Energy-absorption device comprising head-to-foot conical elements

Country Status (3)

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EP (1) EP1682793A1 (en)
FR (1) FR2862362B1 (en)
WO (1) WO2005050053A1 (en)

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CN102996693A (en) * 2012-10-19 2013-03-27 中山市嘉誉塑胶制品有限公司 Damping slice
US8777191B2 (en) 2009-05-20 2014-07-15 Spike Inc. Energy absorption and distribution material
US20150075931A1 (en) * 2010-12-10 2015-03-19 Skydex Technologies, Inc. Interdigitated cellular cushioning

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GB201303048D0 (en) * 2013-02-21 2013-04-03 Wood John Impact absorbing structure

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8777191B2 (en) 2009-05-20 2014-07-15 Spike Inc. Energy absorption and distribution material
US9163688B2 (en) 2009-05-20 2015-10-20 Sp1ke, Inc. Energy absorption and distribution material
US20150075931A1 (en) * 2010-12-10 2015-03-19 Skydex Technologies, Inc. Interdigitated cellular cushioning
CN105736630A (en) * 2010-12-10 2016-07-06 斯凯达克斯科技有限公司 Interdigitated Cellular Cushioning
US9603407B2 (en) * 2010-12-10 2017-03-28 Skydex Technologies, Inc. Interdigitated cellular cushioning
CN105736630B (en) * 2010-12-10 2018-01-02 斯凯达克斯科技有限公司 Intersect cellular buffer
US10197125B2 (en) 2010-12-10 2019-02-05 Skydex Technologies, Inc. Interdigitated cellular cushioning
CN102996693A (en) * 2012-10-19 2013-03-27 中山市嘉誉塑胶制品有限公司 Damping slice

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FR2862362B1 (en) 2006-09-08
EP1682793A1 (en) 2006-07-26
FR2862362A1 (en) 2005-05-20

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