WO1999059865A1 - Bicycle frame, method for making same and structural bar for making same - Google Patents

Bicycle frame, method for making same and structural bar for making same Download PDF

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Publication number
WO1999059865A1
WO1999059865A1 PCT/EP1999/003452 EP9903452W WO9959865A1 WO 1999059865 A1 WO1999059865 A1 WO 1999059865A1 EP 9903452 W EP9903452 W EP 9903452W WO 9959865 A1 WO9959865 A1 WO 9959865A1
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WO
WIPO (PCT)
Prior art keywords
profile
compartments
section
bicycle frame
tubular
Prior art date
Application number
PCT/EP1999/003452
Other languages
French (fr)
Inventor
Kyrre D. Fredriksen
Original Assignee
Cycleurope Ab
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 Cycleurope Ab filed Critical Cycleurope Ab
Priority to AU43637/99A priority Critical patent/AU4363799A/en
Publication of WO1999059865A1 publication Critical patent/WO1999059865A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K19/00—Cycle frames
    • B62K19/02—Cycle frames characterised by material or cross-section of frame members
    • B62K19/04—Cycle frames characterised by material or cross-section of frame members the material being wholly or mainly metallic, e.g. of high elasticity
    • B62K19/06—Cycle frames characterised by material or cross-section of frame members the material being wholly or mainly metallic, e.g. of high elasticity tubular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K19/00—Cycle frames
    • B62K19/02—Cycle frames characterised by material or cross-section of frame members

Definitions

  • Bicycle frame method of manufacturing the same and profile for the manufacture of such a bicycle frame
  • the present invention relates to a bicycle frame, its manufacturing process and the profile used to manufacture the bicycle frame.
  • Bicycle frames of conventional manufacture are mainly produced using metal tubes arranged in a diamond shape with a front triangle and a rear triangle.
  • the front triangle has a head tube for connection to the bicycle handlebar and the front wheel assembly; a seat support tube having an upper end which receives the seat post and a lower end connected to the bottom bracket support means; an upper tube said main beam connected to the head tube and to the upper end of the saddle support tube; and a lower tube said lower beam connected to the head tube and to the lower end of the saddle support tube.
  • the rear triangle comprises a rear upper fork, produced from a left tube intended to connect the upper left part of the saddle support tube to the left part of the rear wheel assembly, and a right tube intended to connect the upper right part of the saddle support tube to the right part of the rear wheel assembly, and a rear lower fork made from a left chain support tube intended to connect the lower left part of the tube saddle support tube on the left side of the rear wheel assembly and a right chain support tube for connecting the lower right side of the saddle support tube to the right side of the rear wheel assembly.
  • the main drawback with the diamond-shaped frame is the relatively large number of tubes and junctions which have to be provided and welded, brazed or glued. This is further complicated by the need to connect tubes of different sections and different materials thus implying a relatively long manufacturing process with high manufacturing costs. In addition, given the large number of tubes and fixing points, the transmission of compression and tensile forces is poorly distributed throughout the frame.
  • the rear triangular frame part has been reduced in order to include only a single upper rear fork or a lower rear fork, comprising two tubes, one to left and the other to the right of the rear wheel assembly.
  • the cost associated with the manufacture of such frames still remains high.
  • Another approach to simplifying the manufacturing process of conventional diamond-shaped bicycle frames is to use one-piece type bicycle frames obtained by molding.
  • Monobloc bicycle frames that are made of composite fibers are also significantly lighter than metal frames.
  • one-piece bicycle frames have the disadvantage that they require relatively complicated molds for manufacturing. Furthermore, because high precision molding is necessary, molds are often expensive to build, which puts a heavy strain on the cost of bicycles.
  • the object of the invention is to avoid the drawbacks mentioned above by proposing a bicycle frame whose manufacturing cost is low and which moreover ensures a better distribution of the compression and traction forces in order to withstand the greatest stresses.
  • the invention therefore relates to a profile with a closed contour of longitudinal axis X, characterized in that it comprises three internal tubular compartments extending along the longitudinal axis X, each compartment having an external partition defining at least partially the contour of said profile and an internal partition partially delimiting an intermediate recess extending radially up to the contour of said profile by forming breakable connection zones between said compartments.
  • the internal partitions are separated so as to define, on the contour of the profile, connecting sections whose dimensions are sufficient to allow the connection to be broken without causing the compartments to open; said compartments have concave internal walls; the profile has an elliptical contour; the profile has a circular outline; the profile is made with an extruded metal such as aluminum; the profile comprises at least two identical tubular compartments.
  • the invention also relates to a method of manufacturing a bicycle frame from said section, characterized in that said section is cut in order to obtain a section of section of predetermined length and then it is bent along a median plane.
  • the two identical tubular compartments so that the tubular compartment is arranged radially inside the bending curvature;
  • the two connection zones located between the tubular compartment and the two identical compartments are cut over a length at least equal to the length of the cut of the connection zone located between the two identical tubular compartments, and less than the length of the profiled section , so as to obtain three independent tubes;
  • the free ends of the rear fork are machined to create means for fixing the rear wheel;
  • the frame is assembled by attaching a steering end piece to the front end of the profiled section, a bottom
  • the method is characterized in that said free ends of the fork are crushed and punched to create means for fixing the rear wheel, a portion of the free end of the fork is cut out. the lower beam before assembly of the frame, and in that the section of section is heat treated before assembly of the frame.
  • the invention also relates to a bicycle frame comprising a rear fork, an upper beam, a lower beam and a saddle support element, characterized in that a first front portion of the frame consists of a profile with closed contour which comprises two identical internal tubular compartments and an internal lower tubular compartment, each compartment having an external partition defining at least partially the contour of said profile and an internal partition partially delimiting an intermediate recess extending radially up to the contour of said profile, forming connecting zones between the compartments, and in that in a second portion located behind the first portion, said profile splits into three divergent tubes each extending one of the three compartments, the lower beam being constituted by the tube located in the extension of the lower tubular compartment, and the rear fork secured to the upper beam being constituted by the two tubes situated in the extension of the two identical tubular compartments between which the saddle support element is disposed.
  • Bicycle frame characterized in that the saddle support element is connected to the free end of the lower beam by a bottom bracket fitting comprising a first end piece with a profile complementary to the section of the free end of the lower beam, so as to allow its insertion, a second end piece with a profile complementary to the section of the saddle support element so as to allow its insertion and a transverse bore intended to accommodate the crankset axle.
  • Bicycle frame characterized in that the end of the front portion of the frame is connected to the front fork by a steering connection comprising a tip of profile complementary to the section from the end of the front portion of the frame so as to allow its insertion and a vertical bore intended to accommodate the steering axis of the front fork.
  • Bicycle frame characterized in that the upper beam is constituted by the first front portion of the frame and by the identical tubular compartments and / or the tubes forming said rear fork.
  • Bicycle frame characterized in that the saddle support element is held between the two tubes situated in the extension of the two identical tubular compartments by wedging means.
  • Bicycle frame characterized in that the wedging means consist of a single element, the lateral faces of which are in contact with the wall of the said tubes situated in the extension of the two identical tubular compartments, the said element being also provided with a bore allowing passage of the saddle support element.
  • Bicycle frame characterized in that the rear end of said element has a concave curvature so as to allow free rotation of the rear wheel.
  • Bicycle frame characterized in that the wedging means consist of two complementary elements each element having a first lateral face in contact with the wall of a tube and a second lateral face in contact with the other element, the second lateral face being provided with a partially cylindrical bore intended, by assembly with the bore of the complementary element, to allow the passage of the saddle support element.
  • Bicycle frame characterized in that the rear end of each element has a curvature so as to allow free rotation of the rear wheel.
  • Bicycle frame characterized in that the rear end of each tube located in the extension of one of the two identical tubular compartments has a flattened section.
  • Bicycle frame characterized in that the free end of each tube situated in the extension of one of the two identical tubular compartments is provided with a notch so as to allow the fixing of the axis of the rear wheel of a bicycle .
  • Bicycle frame characterized in that the profile is made with an extruded metal such as aluminum.
  • the profile according to the invention makes it possible to manufacture bicycle frames having a substantially reduced number of components and seals in a simple and inexpensive manner.
  • the section of the tubular compartments as well as the thickness of the internal and external partitions forming the profile can also be chosen so as to reinforce a particular place in the frame, just as the connecting zones separating said compartments can be cut along a certain length in order to 'increase or reduce the inherent elasticity of the frame which can be applied to both so-called mountain bikes and conventional bicycles.
  • the invention will be better understood on reading the description which follows, accompanied by the drawings on which;
  • FIG. 1 shows a sectional view of the section of the profile
  • FIG. 1 shows a perspective view of a section of profile
  • FIG. 9 shows the bicycle frame according to the invention once assembled
  • FIG. 10 shows a schematic perspective view of a bicycle provided with a frame according to the invention
  • FIG. 11 shows a perspective view of a wedging means according to an alternative embodiment
  • FIG. 12 and 13 show a perspective view of the profile trunk according to a second embodiment of the bicycle frame.
  • Figure 1 shows a cross-sectional view of a section 1 of longitudinal axis X as shown in Figure 2.
  • This section 1 made with an extruded metal such as aluminum is closed in outline and has three internal tubular compartments 2, 3 and
  • tubular compartments 2 and 3 which extend along the longitudinal axis X. These three compartments tubulars are arranged and dimensioned in such a way that the tubular compartments 2 and 3 are identical and are located substantially above the tubular compartment 4.
  • Each tubular compartment 2, 3 or 4 has an external partition 21, 31 or 41 and an internal partition 28, 32 or 42.
  • the internal partitions 22, 32 and 42 define inside said profile 1 an intermediate recess 5 having substantially the shape of an inverted "Y" which extends along the longitudinal axis X and also radially up to the contour of the profile 1 by forming breakable connection zones 6, 7 and 8.
  • the connecting zones 6, 7 and 8 which respectively separate the compartments 3 and 2, the compartments 2 and 4 and the compartments 3 and 4 define with the external partitions 21, 31 and 41 of said compartments 2, 3 and 4, the whole of the closed contour of said profile 1. Furthermore, the breakable connection zones 6, 7 and 8 are wide enough to allow them to break without however causing the opening of the tubular compartments 2, 3 and 4.
  • the tubular compartments 2, 3 and 4 have concave internal walls, which gives the entire profile increased rigidity and very good resistance to the efforts of fleece and bending.
  • the profile 1 has an elliptical section but of course any closed contour can be considered such as a circular, square or rectangular contour.
  • the manufacture of a bicycle frame from the section 1 described above is carried out as follows.
  • a profile is directly cut by extrusion in order to obtain a section of profile 1 of predetermined length.
  • This length will of course be a function of the size of the desired frame, then it is bent along a median plane to the two identical tubular compartments 2 and 3 so that the tubular compartment 4 is arranged radially inside the bending curvature C This bending curvature C improves the resistance of said profile to bending.
  • the two connecting zones 7 and 8 located between the tubular compartment 4 and the two identical compartments are cut out.
  • connection zones 6, 7 and 8 can be done by milling or by means of a water jet or laser cut taking care to insert an object which will absorb the surplus energy in order to d 'avoid any deterioration of the internal partitions 22, 32 and 42 of said tubular compartments 2, 3 and 4.
  • the tube 9 located in the extension of tubular compartment 4 in the mid-plane is moved aside to the two tubular compartments 2 and 3 in order to produce a lower beam having substantially the shape of an elbow.
  • connection zones 6, 7 and 8 which have not been cut connect the tubular compartments 2, 3 and 4 to each other by forming a front portion 27 of the section of section 1.
  • the rear fork defines with the two identical tubular compartments 2 and 3 still connected by the connection zone 6 and with the front portion 27 of said profile section an upper beam.
  • the latter can be heat treated.
  • the frame is assembled by fixing a steering connector 19 to the end of the front portion 27 of the profile section 1.
  • This steering connector 19 comprises a tip 20 of complementary profile to the section of the end of the front portion 27 so as to allow its insertion and a vertical bore 30 intended to accommodate the steering axis of the front fork of the bicycle.
  • the free end of the tube 9 forming the lower beam is also connected to a saddle support element 17 disposed between the tubes 10 and 11 by means of a bottom bracket connector 13.
  • This bottom bracket 13 includes a first end piece 16 of complementary profile to the section of the free end of the tube 9 so as to allow its insertion and a second end piece 15 of complementary profile to the section of the saddle support element 17 so as to also allow its insertion.
  • the bottom bracket 13 also includes a transverse bore 14 for accommodating the bottom bracket axle.
  • wedging means are also mounted between the two tubes 10 and 11.
  • These wedging means may consist of two complementary elements 18, only one of these elements 18 is shown in FIG. 8, the second element 18 being mounted between the saddle support element 17 and the tube 10.
  • the element 18, as can be seen in FIG. 8, comprises a first lateral face 23 in contact with the wall of the tube 11 and a second lateral face 24 in contact with the other element.
  • the second lateral face 24 is moreover provided with a partially cylindrical bore 25 intended, by assembly with the bore of the complementary element, to allow the passage of the saddle support element
  • the rear end of the element 18 has a curvature 26 so as to allow free rotation of the rear zone.
  • the wedging means consist of a single element 19, the two lateral faces 20 of which are in contact with the wall of said tubes 10 and 11, said element 19 also being provided with a bore 28 allowing passage of the element saddle support 17.
  • the rear end of the element 19 also has a concave curvature 29 so as to allow the free rotation of the rear wheel.
  • the bottom bracket fitting 13, the steering fitting 19, the saddle support element 17 as well as the two wedging elements 18 or the element 19 can be made of aluminum and assembled to said profile section 1 using sticky materials.
  • the connecting zone 6 is located located between the two identical compartments 2 and 3 over a length L equal to the length of the cutting of the connecting zones 7 and 8, located between the tubular compartment 4 and the two identical compartments 2 and 3.
  • the upper beam will be defined by the front portion 27 of the profile section and by the tubes 10 and 11 forming the rear fork.
  • the frame according to the invention has the advantage of having an upper beam , a lower beam and a rear fork made from a single profile, which reduces the number of operations, manipulations and assembly, while offering high performance bicycles.
  • the use in specific areas of tubes or tubular compartments with concave walls connected by connecting areas makes it possible to produce a frame having high lateral rigidity and resistance to torsion while ensuring flexibility in the vertical direction. .

Abstract

The invention concerns a bicycle frame comprising a rear fork, an upper beam, a lower beam and saddle supporting element (17). The invention is characterised in that a front portion (27) of the frame consists of a structural bar with closed outline comprising two identical tubular lateral sections (2, 3) and a lower tubular section (4), each section (2, 3, 4) having an outer wall (21, 31, 41) defining at least partially said structural bar outline and an inner wall (22, 32, 42) partially defining an intervening recess (5) extending radially up to said structural section outline forming linking zones (6, 7, 8) between the sections (2, 3, 4) and in a portion located at rear of the front portion (27), said structural bar is split into three divergent tubes (9, 10, 11) each extending one of the three sections (2, 3, 4), the lower beam being constituted by the tube (9) located in the lower tubular section (4) extension, and the rear fork integral with the upper beam being constituted by the two tubes (10, 11) located in the extension of the two identical tubular sections (2, 3) between which is arranged the saddle supporting element (17).

Description

Cadre de bicyclette, son procédé de fabrication et profilé servant à la fabrication d'un tel cadre de bicyclette Bicycle frame, method of manufacturing the same and profile for the manufacture of such a bicycle frame
La présente invention concerne un cadre de bicyclette, son procédé de fabrication et le profilé servant à fabriquer le cadre de bicyclette.The present invention relates to a bicycle frame, its manufacturing process and the profile used to manufacture the bicycle frame.
Les cadres de bicyclette de fabrication conventionnelle sont principalement réalisés à l'aide de tubes métalliques disposés en forme de losange avec un triangle avant et un triangle arrière. Le triangle avant comporte un tube de tête destiné à être relié au guidon de bicyclette et à l'ensemble de roue avant ; un tube de support de selle ayant une extrémité supérieure qui reçoit la tige de selle et une extrémité inférieure reliée aux moyens de support de pédalier ; un tube supérieur dit poutre principale relié au tube de tête et à l'extrémité supérieure du tube de support de selle ; et un tube inférieur dit poutre inférieure relié au tube de tête et à l'extrémité inférieure du tube de support de selle.Bicycle frames of conventional manufacture are mainly produced using metal tubes arranged in a diamond shape with a front triangle and a rear triangle. The front triangle has a head tube for connection to the bicycle handlebar and the front wheel assembly; a seat support tube having an upper end which receives the seat post and a lower end connected to the bottom bracket support means; an upper tube said main beam connected to the head tube and to the upper end of the saddle support tube; and a lower tube said lower beam connected to the head tube and to the lower end of the saddle support tube.
Par ailleurs, le triangle arrière comporte une fourche supérieure arrière, réalisée à partir d'un tube gauche destiné à relier la partie supérieure gauche du tube de support de selle à la partie gauche de l'ensemble de roue arrière, et un tube droit destiné à relier la partie supérieure droite du tube de support de selle à la partie droite de l'ensemble de roue arrière, et une fourche inférieure arrière réalisée à partir d'un tube de support de chaîne gauche destiné à relier la partie inférieure gauche du tube de support de selle à la partie gauche de l'ensemble de roue arrière et un tube de support de chaîne droit destiné à relier la partie inférieure droite du tube de support de selle à la partie droite de l'ensemble de roue arrière.Furthermore, the rear triangle comprises a rear upper fork, produced from a left tube intended to connect the upper left part of the saddle support tube to the left part of the rear wheel assembly, and a right tube intended to connect the upper right part of the saddle support tube to the right part of the rear wheel assembly, and a rear lower fork made from a left chain support tube intended to connect the lower left part of the tube saddle support tube on the left side of the rear wheel assembly and a right chain support tube for connecting the lower right side of the saddle support tube to the right side of the rear wheel assembly.
Le principal inconvénient avec le cadre en forme de losange est le nombre relativement important de tubes et de jonctions qui doivent être prévus et soudés, brasés ou collés. Ceci est encore compliqué par la nécessité de relier des tubes de différentes sections et différentes matières impliquant ainsi un processus de fabrication relativement long avec des coûts de fabrication élevés. Par ailleurs, étant donné le nombre important de tubes et de points de fixation, la transmission des efforts de compression et de traction est mal répartie dans l'ensemble du cadre.The main drawback with the diamond-shaped frame is the relatively large number of tubes and junctions which have to be provided and welded, brazed or glued. This is further complicated by the need to connect tubes of different sections and different materials thus implying a relatively long manufacturing process with high manufacturing costs. In addition, given the large number of tubes and fixing points, the transmission of compression and tensile forces is poorly distributed throughout the frame.
Afin de réduire la complexité et le coût associé à la fabrication de tels cadres de bicyclette, la partie de cadre triangulaire arrière a été réduite afin de ne comprendre qu'une seule fourche supérieure arrière ou une fourche inférieure arrière, comportant deux tubes, un à gauche et l'autre à droite de l'ensemble de roue arrière. Malheureusement, le coût associé à la fabrication de tels cadres reste malgré tout élevé. Une autre approche pour simplifier le processus de fabrication des cadres de bicyclette conventionnels en forme de losange consiste à utiliser des cadres de bicyclette du type monobloc obtenus par moulage.In order to reduce the complexity and the cost associated with the manufacture of such bicycle frames, the rear triangular frame part has been reduced in order to include only a single upper rear fork or a lower rear fork, comprising two tubes, one to left and the other to the right of the rear wheel assembly. Unfortunately, the cost associated with the manufacture of such frames still remains high. Another approach to simplifying the manufacturing process of conventional diamond-shaped bicycle frames is to use one-piece type bicycle frames obtained by molding.
Dans la fabrication des cadres de bicyclette monobloc de ce type, aucune soudure ou aucun collage n'est nécessaire, et le cadre de bicyclette fini ne possède pas de joints aboutés. Les cadres de bicyclette monobloc qui sont fabriqués en fibres composites sont également sensiblement plus légers que les cadres métalliques.In the manufacture of one-piece bicycle frames of this type, no welding or gluing is necessary, and the finished bicycle frame does not have butt joints. Monobloc bicycle frames that are made of composite fibers are also significantly lighter than metal frames.
Toutefois, les cadres de bicyclettes monobloc impliquent comme inconvénients qu'ils exigent des moules relativement compliqués pour la fabrication. Par ailleurs, du fait qu'un moulage à précision élevée est nécessaire, les moules sont souvent coûteux à construire, ce qui grève de manière importante, le coût des bicyclettes.However, one-piece bicycle frames have the disadvantage that they require relatively complicated molds for manufacturing. Furthermore, because high precision molding is necessary, molds are often expensive to build, which puts a heavy strain on the cost of bicycles.
L'invention a pour but d'éviter les inconvénients précédemment mentionnés en proposant un cadre de bicyclette dont le coût de fabrication est faible et qui assure par ailleurs une meilleure répartition des efforts de compression et de traction afin de résister aux sollicitations les plus importantes.The object of the invention is to avoid the drawbacks mentioned above by proposing a bicycle frame whose manufacturing cost is low and which moreover ensures a better distribution of the compression and traction forces in order to withstand the greatest stresses.
L'invention a donc pour objet un profilé à contour fermé d'axe longitudinal X, caractérisé en ce qu'il comprend trois compartiments tubulaires internes s'étendant suivant l'axe longitudinal X, chaque compartiment ayant une cloison externe définissant au moins partiellement le contour dudit profilé et une cloison interne délimitant partiellement un évidement intercalaire s'étendant radialement jusqu'au contour dudit profilé en formant des zones de liaison sécables entre lesdits compartiments.The invention therefore relates to a profile with a closed contour of longitudinal axis X, characterized in that it comprises three internal tubular compartments extending along the longitudinal axis X, each compartment having an external partition defining at least partially the contour of said profile and an internal partition partially delimiting an intermediate recess extending radially up to the contour of said profile by forming breakable connection zones between said compartments.
Selon d'autres caractéristiques de l'invention : les cloisons internes sont disjointes de façon à définir sur le contour du profil des tronçons de liaison dont les dimensions sont suffisantes pour permettre la rupture de la liaison sans provoquer l'ouverture des compartiments ; lesdits compartiments ont les parois internes concaves ; le profilé présente un contour elliptique ; le profilé présente un contour circulaire ; le profilé est réalisé avec un métal extrudé tel que de l'aluminium ; le profilé comprend au moins deux compartiments tubulaires identiques.According to other characteristics of the invention: the internal partitions are separated so as to define, on the contour of the profile, connecting sections whose dimensions are sufficient to allow the connection to be broken without causing the compartments to open; said compartments have concave internal walls; the profile has an elliptical contour; the profile has a circular outline; the profile is made with an extruded metal such as aluminum; the profile comprises at least two identical tubular compartments.
L'invention a également pour objet un procédé de fabrication d'un cadre de bicyclette à partir dudit profilé, caractérisé en ce qu'on coupe ledit profilé afin d'obtenir un tronçon de profilé de longueur prédéterminée puis on le cintre suivant un plan médian aux deux compartiments tubulaires identiques de telle manière que le compartiment tubulaire soit disposé radialement à l'intérieur de la courbure de cintrage ; on découpe les deux zones de liaisons situées entre le compartiment tubulaire et les deux compartiments identiques sur une longueur au moins égale à la longueur de la découpe de la zone de liaison située entre les deux compartiments tubulaires identiques, et inférieure à la longueur du tronçon profilé, de façon à obtenir trois tubes indépendants ; on écarte le tube situé dans le prolongement du compartiment tubulaire dans le plan médian pour réaliser une "poutre" inférieure et les deux tubes situés dans le prolongement des deux compartiments tubulaires identiques l'un de l'autre afin de réaliser une fourche arrière de bicyclette ; on usine les extrémités libres de la fourche arrière pour créer des moyens de fixation de la roue arrière ; on assemble le cadre en fixant un embout de direction à l'extrémité avant du tronçon profilé, un embout de pédalier à l'extrémité libre du tube formant la poutre inférieure, ledit embout de pédalier permettant de raccorder ladite poutre inférieure à un élément de support de selle coopérant avec des moyens de calage montés à l'intérieur de la fourche arrière.The invention also relates to a method of manufacturing a bicycle frame from said section, characterized in that said section is cut in order to obtain a section of section of predetermined length and then it is bent along a median plane. the two identical tubular compartments so that the tubular compartment is arranged radially inside the bending curvature; the two connection zones located between the tubular compartment and the two identical compartments are cut over a length at least equal to the length of the cut of the connection zone located between the two identical tubular compartments, and less than the length of the profiled section , so as to obtain three independent tubes; we spread the tube located in the extension of the tubular compartment in the median plane to produce a lower "beam" and the two tubes located in the extension of the two tubular compartments identical to each other in order to produce a bicycle rear fork ; the free ends of the rear fork are machined to create means for fixing the rear wheel; the frame is assembled by attaching a steering end piece to the front end of the profiled section, a bottom bracket end to the free end of the tube forming the bottom beam, said bottom bracket making it possible to connect said bottom beam to a support element seat cooperating with wedging means mounted inside the rear fork.
Selon d'autres caractéristiques de l'invention, le procédé est caractérisé en ce qu'on écrase et on poinçonne lesdites extrémités libres de la fourche pour créer des moyens de fixation de la roue arrière, on découpe une portion de l'extrémité libre de la poutre inférieure avant l'assemblage de cadre, et en ce qu'on traite thermiquement le tronçon de profilé avant l'assemblage du cadre.According to other characteristics of the invention, the method is characterized in that said free ends of the fork are crushed and punched to create means for fixing the rear wheel, a portion of the free end of the fork is cut out. the lower beam before assembly of the frame, and in that the section of section is heat treated before assembly of the frame.
L'invention a également pour objet un cadre de bicyclette comprenant une fourche arrière, une poutre supérieure, une poutre inférieure et un élément de support de selle, caractérisé en ce qu'une première portion avant du cadre est constituée par un profilé à contour fermé qui comprend deux compartiments tubulaires identiques internes et un compartiment tubulaire inférieur interne, chaque compartiment ayant une cloison externe définissant au moins partiellement le contour dudit profilé et une cloison interne délimitant partiellement un évidement intercalaire s'étendant radialement jusqu'au contour dudit profilé, en formant des zones de liaison entre les compartiments, et en ce que dans une seconde portion située en arrière de la première portion, ledit profilé se scinde en trois tubes divergents prolongeant chacun l'un des trois compartiments, la poutre inférieure étant constituée par le tube situé dans le prolongement du compartiment tubulaire inférieur, et la fourche arrière solidaire de la poutre supérieure étant constituée par les deux tubes situés dans le prolongement des deux compartiments tubulaires identiques entre lesquels est disposé l'élément de support de selle.The invention also relates to a bicycle frame comprising a rear fork, an upper beam, a lower beam and a saddle support element, characterized in that a first front portion of the frame consists of a profile with closed contour which comprises two identical internal tubular compartments and an internal lower tubular compartment, each compartment having an external partition defining at least partially the contour of said profile and an internal partition partially delimiting an intermediate recess extending radially up to the contour of said profile, forming connecting zones between the compartments, and in that in a second portion located behind the first portion, said profile splits into three divergent tubes each extending one of the three compartments, the lower beam being constituted by the tube located in the extension of the lower tubular compartment, and the rear fork secured to the upper beam being constituted by the two tubes situated in the extension of the two identical tubular compartments between which the saddle support element is disposed.
Cadre de bicyclette caractérisé en ce que l'élément de support de selle est relié à l'extrémité libre de la poutre inférieure par un raccord de pédalier comprenant un premier embout de profil complémentaire à la section de l'extrémité libre de la poutre inférieure, de façon à permettre son insertion, un deuxième embout de profil complémentaire à la section de l'élément de support de selle de façon à permettre son insertion et un alésage transversal destiné à loger l'axe du pédalier.Bicycle frame characterized in that the saddle support element is connected to the free end of the lower beam by a bottom bracket fitting comprising a first end piece with a profile complementary to the section of the free end of the lower beam, so as to allow its insertion, a second end piece with a profile complementary to the section of the saddle support element so as to allow its insertion and a transverse bore intended to accommodate the crankset axle.
Cadre de bicyclette caractérisé en ce que l'extrémité de la portion avant du cadre est reliée à la fourche avant par un raccord de direction comprenant un embout de profil complémentaire à la section de l'extrémité de la portion avant du cadre de façon à permettre son insertion et un alésage vertical destiné à loger l'axe de direction de la fourche avant.Bicycle frame characterized in that the end of the front portion of the frame is connected to the front fork by a steering connection comprising a tip of profile complementary to the section from the end of the front portion of the frame so as to allow its insertion and a vertical bore intended to accommodate the steering axis of the front fork.
Cadre de bicyclette caractérisé en ce que la poutre supérieure est constituée par la première portion avant du cadre et par les compartiments tubulaires identiques et/ou les tubes formant ladite fourche arrière.Bicycle frame characterized in that the upper beam is constituted by the first front portion of the frame and by the identical tubular compartments and / or the tubes forming said rear fork.
Cadre de bicyclette caractérisé en ce que l'élément de support de selle est maintenu entre les deux tubes situés dans le prolongement des deux compartiments tubulaires identiques par des moyens de calage.Bicycle frame characterized in that the saddle support element is held between the two tubes situated in the extension of the two identical tubular compartments by wedging means.
Cadre de bicyclette caractérisé en ce que les moyens de calage sont constitués d'un seul élément dont les faces latérales sont en contact avec la paroi desdits tubes situés dans le prolongement des deux compartiments tubulaires identiques, ledit élément étant, en outre pourvu d'un alésage permettant le passage de l'élément de support de selle.Bicycle frame, characterized in that the wedging means consist of a single element, the lateral faces of which are in contact with the wall of the said tubes situated in the extension of the two identical tubular compartments, the said element being also provided with a bore allowing passage of the saddle support element.
Cadre de bicyclette, caractérisé en ce que l'extrémité arrière dudit élément présente une courbure concave de façon à permettre la libre rotation de la roue arrière. Cadre de bicyclette caractérisé en ce que les moyens de calage sont constitués de deux éléments complémentaires chaque élément ayant une première face latérale en contact avec la paroi d'un tube et une seconde face latérale en contact avec l'autre élément, la seconde face latérale étant pourvue d'un alésage partiellement cylindrique destiné, par assemblage avec l'alésage de l'élément complémentaire, à permettre le passage de l'élément de support de selle.Bicycle frame, characterized in that the rear end of said element has a concave curvature so as to allow free rotation of the rear wheel. Bicycle frame characterized in that the wedging means consist of two complementary elements each element having a first lateral face in contact with the wall of a tube and a second lateral face in contact with the other element, the second lateral face being provided with a partially cylindrical bore intended, by assembly with the bore of the complementary element, to allow the passage of the saddle support element.
Cadre de bicyclette caractérisé en ce que l'extrémité arrière de chaque élément présente une courbure de façon à permettre la libre rotation de la roue arrière. Cadre de bicyclette caractérisé en ce que l'extrémité arrière de chaque tube situé dans le prolongement d'un des deux compartiments tubulaires identiques présente une section aplatie.Bicycle frame characterized in that the rear end of each element has a curvature so as to allow free rotation of the rear wheel. Bicycle frame characterized in that the rear end of each tube located in the extension of one of the two identical tubular compartments has a flattened section.
Cadre de bicyclette caractérisé en ce que l'extrémité libre de chaque tube situé dans le prolongement d'un des deux compartiments tubulaires identiques est pourvue d'une encoche de façon à permettre la fixation de l'axe de la roue arrière d'une bicyclette. Cadre de bicyclette caractérisé en ce que le profilé est réalisé avec un métal extrudé tel que de l'aluminium.Bicycle frame characterized in that the free end of each tube situated in the extension of one of the two identical tubular compartments is provided with a notch so as to allow the fixing of the axis of the rear wheel of a bicycle . Bicycle frame characterized in that the profile is made with an extruded metal such as aluminum.
Le profilé selon l'invention permet de fabriquer de façon simple et peu coûteuse des cadres de bicyclette ayant un nombre sensiblement réduit de composants et de joints.The profile according to the invention makes it possible to manufacture bicycle frames having a substantially reduced number of components and seals in a simple and inexpensive manner.
De plus, il suffit de découper le profilé sur une certaine longueur afin de réaliser des cadres de bicyclette de tailles différentes.In addition, it suffices to cut the profile over a certain length in order to produce bicycle frames of different sizes.
La section des compartiments tubulaires ainsi que l'épaisseur des cloisons interne et externe formant le profilé peuvent également être choisies de manière à renforcer un endroit particulier du cadre, tout comme les zones de liaison séparant lesdits compartiments peuvent être découpées suivant une certaine longueur afin d'augmenter ou de réduire l'élasticité propre du cadre qui peut s'appliquer aussi bien aux bicyclettes dites tout terrain qu'aux bicyclettes conventionnelles. L'invention sera mieux comprise à la lecture de la description qui va suivre accompagnée des dessins sur lesquels ;The section of the tubular compartments as well as the thickness of the internal and external partitions forming the profile can also be chosen so as to reinforce a particular place in the frame, just as the connecting zones separating said compartments can be cut along a certain length in order to 'increase or reduce the inherent elasticity of the frame which can be applied to both so-called mountain bikes and conventional bicycles. The invention will be better understood on reading the description which follows, accompanied by the drawings on which;
- la figure 1 représente une vue en coupe de la section du profilé ;- Figure 1 shows a sectional view of the section of the profile;
- la figure 2 représente une vue en perspective d'un tronçon de profilé ;- Figure 2 shows a perspective view of a section of profile;
- les figures 3 à 8 représentent les différentes étapes de fabrication du cadre de bicyclette à partir dudit profilé ;- Figures 3 to 8 show the different stages of manufacturing the bicycle frame from said profile;
- la figure 9 représente le cadre de bicyclette selon l'invention une fois assemblé ; - la figure 10 représente une vue schématique en perspective d'une bicyclette pourvue d'un cadre selon l'invention ;- Figure 9 shows the bicycle frame according to the invention once assembled; - Figure 10 shows a schematic perspective view of a bicycle provided with a frame according to the invention;
- la figure 11 représente une vue en perspective d'un moyen de calage selon une variante de réalisation ; et- Figure 11 shows a perspective view of a wedging means according to an alternative embodiment; and
- les figures 12 et 13 représentent une vue en perspective du tronc de profilé selon un second mode de réalisation du cadre de bicyclette.- Figures 12 and 13 show a perspective view of the profile trunk according to a second embodiment of the bicycle frame.
La figure 1 représente une vue en coupe transversale d'un profilé 1 d'axe longitudinal X comme représenté sur la figure 2. Ce profilé 1 réalisé avec un métal extrudé tel que de l'aluminium est à contour fermé et possède trois compartiments tubulaires internes 2, 3 etFigure 1 shows a cross-sectional view of a section 1 of longitudinal axis X as shown in Figure 2. This section 1 made with an extruded metal such as aluminum is closed in outline and has three internal tubular compartments 2, 3 and
4 qui s'étendent suivant l'axe longitudinal X. Ces trois compartiments tubulaires sont disposés et dimensionnés de telle manière que les compartiments tubulaires 2 et 3 soient identiques et se situent sensiblement au-dessus du compartiment tubulaire 4.4 which extend along the longitudinal axis X. These three compartments tubulars are arranged and dimensioned in such a way that the tubular compartments 2 and 3 are identical and are located substantially above the tubular compartment 4.
Chaque compartiment tubulaire 2, 3 ou 4 possède une cloison externe 21, 31 ou 41 et une cloison interne 28, 32 ou 42.Each tubular compartment 2, 3 or 4 has an external partition 21, 31 or 41 and an internal partition 28, 32 or 42.
Les cloisons internes 22, 32 et 42 définissent à l'intérieur dudit profilé 1 un évidement intercalaire 5 ayant sensiblement la forme d'un "Y" inversé qui s'étend suivant l'axe longitudinal X et également radialement jusqu'au contour du profilé 1 en formant des zones de liaison 6, 7 et 8 sécables.The internal partitions 22, 32 and 42 define inside said profile 1 an intermediate recess 5 having substantially the shape of an inverted "Y" which extends along the longitudinal axis X and also radially up to the contour of the profile 1 by forming breakable connection zones 6, 7 and 8.
Les zones de liaison 6, 7 et 8 qui séparent respectivement les compartiments 3 et 2, les compartiments 2 et 4 et les compartiments 3 et 4 définissent avec les cloisons externes 21, 31 et 41 desdits compartiments 2, 3 et 4, l'ensemble du contour fermé dudit profilé 1. Par ailleurs, les zones de liaison 6, 7 et 8 sécables sont suffisamment larges pour permettre leur rupture sans toutefois provoquer l'ouverture des compartiments tubulaires 2, 3 et 4.The connecting zones 6, 7 and 8 which respectively separate the compartments 3 and 2, the compartments 2 and 4 and the compartments 3 and 4 define with the external partitions 21, 31 and 41 of said compartments 2, 3 and 4, the whole of the closed contour of said profile 1. Furthermore, the breakable connection zones 6, 7 and 8 are wide enough to allow them to break without however causing the opening of the tubular compartments 2, 3 and 4.
Selon une autre caractéristique, les compartiments tubulaires 2, 3 et 4 ont des parois internes concaves, ce qui confère à l'ensemble du profilé une rigidité accrue et une très bonne résistance aux efforts de toison et de flexion.According to another characteristic, the tubular compartments 2, 3 and 4 have concave internal walls, which gives the entire profile increased rigidity and very good resistance to the efforts of fleece and bending.
Comme on peut le voir sur la figure 1, le profilé 1 possède une section elliptique mais bien entendu tout contour fermé peut être envisagé tel qu'un contour circulaire, carré ou rectangulaire. La fabrication d'un cadre de bicyclette à partir du profilé 1 décrit ci-dessus est réalisée de la façon suivante.As can be seen in Figure 1, the profile 1 has an elliptical section but of course any closed contour can be considered such as a circular, square or rectangular contour. The manufacture of a bicycle frame from the section 1 described above is carried out as follows.
Tout d'abord, on découpe un profilé directement obtenu par extrusion afin d'obtenir un tronçon de profilé 1 de longueur prédéterminée. Cette longueur sera bien entendu fonction de la taille du cadre désiré, puis on le cintre suivant un plan médian aux deux compartiments tubulaires identiques 2 et 3 de telle manière que le compartiment tubulaire 4 soit disposé radialement à l'intérieur de la courbure de cintrage C. Cette courbure de cintrage C permet d'améliorer la résistance dudit profilé au pliage. Ensuite, on découpe les deux zones de liaison 7 et 8 situées entre le compartiment tubulaire 4 et les deux compartiments identiques 2 et 3 sur une longueur L supérieure à la longueur 1 de la découpe de la zone de liaison 6 située entre les deux compartiments tubulaires identiques 2 et 3 tout en étant inférieure à la longueur totale du tronçon profilé de façon à obtenir trois tubes 9, 10 et 11 indépendants, situés respectivement dans le prolongement des compartiments tubulaires 4, 2 et 3.First of all, a profile is directly cut by extrusion in order to obtain a section of profile 1 of predetermined length. This length will of course be a function of the size of the desired frame, then it is bent along a median plane to the two identical tubular compartments 2 and 3 so that the tubular compartment 4 is arranged radially inside the bending curvature C This bending curvature C improves the resistance of said profile to bending. Next, the two connecting zones 7 and 8 located between the tubular compartment 4 and the two identical compartments are cut out. 2 and 3 over a length L greater than the length 1 of the cutout of the connection zone 6 situated between the two identical tubular compartments 2 and 3 while being less than the total length of the profiled section so as to obtain three tubes 9, 10 and 11 independent, located respectively in the extension of the tubular compartments 4, 2 and 3.
La découpe des zones de liaison 6, 7 et 8 peut se faire par fraisage ou par l'intermédiaire d'une coupe au jet d'eau ou au laser en prenant soin d'insérer un objet qui absorbera l'énergie en surplus afin d'éviter toutes détériorations des cloisons internes 22, 32 et 42 desdits compartiments tubulaires 2, 3 et 4.The cutting of the connection zones 6, 7 and 8 can be done by milling or by means of a water jet or laser cut taking care to insert an object which will absorb the surplus energy in order to d 'avoid any deterioration of the internal partitions 22, 32 and 42 of said tubular compartments 2, 3 and 4.
Ensuite, on écarte le tube 9 situé dans le prolongement de compartiment tubulaire 4 dans le plan médium aux deux compartiments tubulaires 2 et 3 afin de réaliser une poutre inférieure ayant sensiblement la forme d'un coude.Next, the tube 9 located in the extension of tubular compartment 4 in the mid-plane is moved aside to the two tubular compartments 2 and 3 in order to produce a lower beam having substantially the shape of an elbow.
Les zones de liaison 6, 7 et 8 n'ayant pas été découpées relient les compartiments tubulaires 2, 3 et 4 entre eux en formant une portion avant 27 du tronçon de profilé 1.The connection zones 6, 7 and 8 which have not been cut connect the tubular compartments 2, 3 and 4 to each other by forming a front portion 27 of the section of section 1.
On écarte ensuite, comme on peut le voir sur la figure 6, les deux tubes 10 et 11 situés respectivement dans le prolongement des deux compartiments tubulaires identiques 2 et 3 l'un de l'autre afin de réaliser une fourche arrière de bicyclette.We then move aside, as can be seen in FIG. 6, the two tubes 10 and 11 situated respectively in the extension of the two identical tubular compartments 2 and 3 from one another in order to produce a rear bicycle fork.
La fourche arrière définit avec les deux compartiments tubulaires identiques 2 et 3 encore reliés par la zone de liaison 6 et avec la portion avant 27 dudit tronçon de profilé une poutre supérieure.The rear fork defines with the two identical tubular compartments 2 and 3 still connected by the connection zone 6 and with the front portion 27 of said profile section an upper beam.
On écrase et on poinçonne les extrémités libres des tubes 10 etThe free ends of the tubes 10 are crushed and punched
11 formant la fourche arrière pour créer des moyens de fixation tels que des encoches 12 dans lesquelles sera disposé le pivot de la roue arrière de la bicyclette, et on découpe une portion de l'extrémité libre du tube 9 formant la poutre inférieure.11 forming the rear fork to create fixing means such as notches 12 in which the pivot of the rear wheel of the bicycle will be disposed, and a portion of the free end of the tube 9 forming the lower beam is cut.
Suivant le type d'aluminium ou de matériaux utilisés pour la réalisation du tronçon de profilé 1, ce dernier peut être traité thermiquement.Depending on the type of aluminum or materials used for the production of the section of section 1, the latter can be heat treated.
Ensuite, comme on peut le voir sur la figure 8, on assemble le cadre en fixant un raccord de direction 19 à l'extrémité de la portion avant 27 du tronçon de profilé 1. Ce raccord de direction 19 comprend un embout 20 de profil complémentaire à la section de l'extrémité de la portion avant 27 de façon à permettre son insertion et un alésage 30 vertical destiné à loger l'axe de direction de la fourche avant de la bicyclette. On relie également l'extrémité libre du tube 9 formant la poutre inférieure à un élément de support de selle 17 disposé entre les tubes 10 et 11 par l'intermédiaire d'un raccord de pédalier 13.Then, as can be seen in FIG. 8, the frame is assembled by fixing a steering connector 19 to the end of the front portion 27 of the profile section 1. This steering connector 19 comprises a tip 20 of complementary profile to the section of the end of the front portion 27 so as to allow its insertion and a vertical bore 30 intended to accommodate the steering axis of the front fork of the bicycle. The free end of the tube 9 forming the lower beam is also connected to a saddle support element 17 disposed between the tubes 10 and 11 by means of a bottom bracket connector 13.
Ce raccord de pédalier 13 comprend un premier embout 16 de profil complémentaire à la section de l'extrémité libre du tube 9 de façon à permettre son insertion et un deuxième embout 15 de profil complémentaire à la section de l'élément de support de selle 17 de façon à permettre également son insertion.This bottom bracket 13 includes a first end piece 16 of complementary profile to the section of the free end of the tube 9 so as to allow its insertion and a second end piece 15 of complementary profile to the section of the saddle support element 17 so as to also allow its insertion.
Le raccord de pédalier 13 comprend également un alésage 14 transversal destiné à loger l'axe du pédalier. Afin de maintenir l'élément de support de selle 17 entre les deux tubes 10 et 11 situés dans le prolongement des compartiments tubulaires identiques 2 et 3, on monte également des moyens de calage entre les deux tubes 10 et 11.The bottom bracket 13 also includes a transverse bore 14 for accommodating the bottom bracket axle. In order to maintain the saddle support element 17 between the two tubes 10 and 11 situated in the extension of the identical tubular compartments 2 and 3, wedging means are also mounted between the two tubes 10 and 11.
Ces moyens de calage peuvent être constitués de deux éléments 18 complémentaires, un seul de ces éléments 18 est représenté sur la figure 8, le deuxième élément 18 étant monté entre l'élément de support de selle 17 et le tube 10.These wedging means may consist of two complementary elements 18, only one of these elements 18 is shown in FIG. 8, the second element 18 being mounted between the saddle support element 17 and the tube 10.
L'élément 18, comme on peut le voir sur la figure 8, comprend une première face latérale 23 en contact avec la paroi du tube 11 et une seconde face latérale 24 en contact avec l'autre élément. La seconde face latérale 24 est par ailleurs pourvue d'un alésage 25 partiellement cylindrique destiné, par assemblage avec l'alésage de l'élément complémentaire, à permettre le passage de l'élément de support de selleThe element 18, as can be seen in FIG. 8, comprises a first lateral face 23 in contact with the wall of the tube 11 and a second lateral face 24 in contact with the other element. The second lateral face 24 is moreover provided with a partially cylindrical bore 25 intended, by assembly with the bore of the complementary element, to allow the passage of the saddle support element
17. L'extrémité arrière de l'élément 18 présente une courbure 26 de façon à permettre la libre rotation de la zone arrière.17. The rear end of the element 18 has a curvature 26 so as to allow free rotation of the rear zone.
Selon une variante de réalisation représentée sur les figures 9 etAccording to an alternative embodiment shown in FIGS. 9 and
11, les moyens de calage sont constitués par un seul élément 19 dont les deux faces latérales 20 sont en contact avec la paroi desdits tubes 10 et 11, ledit élément 19 étant également pourvu d'un alésage 28 permettant le passage de l'élément de support de selle 17. L'extrémité arrière de l'élément 19 présente également une courbure 29 concave de façon à permettre la libre rotation de la roue arrière.11, the wedging means consist of a single element 19, the two lateral faces 20 of which are in contact with the wall of said tubes 10 and 11, said element 19 also being provided with a bore 28 allowing passage of the element saddle support 17. The rear end of the element 19 also has a concave curvature 29 so as to allow the free rotation of the rear wheel.
Le raccord de pédalier 13, le raccord de direction 19, l'élément de support de selle 17 ainsi que les deux éléments de calage 18 ou l'élément 19 peuvent être réalisés en aluminium et assemblés audit tronçon de profilé 1 à l'aide de matières collantes.The bottom bracket fitting 13, the steering fitting 19, the saddle support element 17 as well as the two wedging elements 18 or the element 19 can be made of aluminum and assembled to said profile section 1 using sticky materials.
Par ailleurs, après la découpe des zones de liaison 6, 7 et 8, on pourra prévoir d'éliminer les arêtes vives situées au niveau des zones de coupure par meulage ou tout autre moyen.Furthermore, after cutting the connecting zones 6, 7 and 8, provision may be made to eliminate the sharp edges located at the cutting zones by grinding or any other means.
Selon un autre mode de réalisation du cadre de bicyclette, représenté sur la figure 13, on découpe la zone de liaison 6 située entre les deux compartiments identiques 2 et 3 sur une longueur L égale à la longueur de la découpe des zones de liaison 7 et 8, situées entre le compartiment tubulaire 4 et les deux compartiments identiques 2 et 3. Dans ce cas, la poutre supérieure sera définie par la portion avant 27 du tronçon de profilé et par les tubes 10 et 11 formant la fourche arrière.According to another embodiment of the bicycle frame, shown in FIG. 13, the connecting zone 6 is located located between the two identical compartments 2 and 3 over a length L equal to the length of the cutting of the connecting zones 7 and 8, located between the tubular compartment 4 and the two identical compartments 2 and 3. In this case, the upper beam will be defined by the front portion 27 of the profile section and by the tubes 10 and 11 forming the rear fork.
Dans ce mode de réalisation, la partie avant 27 du tronçon de profilé 1 sera au plus égale à un tiers de la longueur totale dudit tronçon de profilé 1, comme représenté sur la figure 12, et dans ce cas, le tube 9 situé dans le prolongement du compartiment tubulaire 4 sera écarté dans le plan médium aux deux compartiments tubulaires identiques 2 et 3 de telle manière qu'il soit sensiblement perpendiculaire au compartiment tubulaire 4. Ainsi, le cadre selon l'invention présente l'avantage de comporter une poutre supérieure, une poutre inférieure et une fourche arrière réalisées à partir d'un profilé unique, ce qui diminue le nombre d'opération, de manipulations et d'assemblage, tout en offrant des bicyclettes de haute performance. De plus, l'utilisation dans des zones déterminées de tubes ou de compartiments tubulaires à paroi concave reliées par des zones de liaison permet de réaliser un cadre possédant une forte rigidité latérale et une résistance à la torsion tout en assurant une souplesse dans la direction verticale. In this embodiment, the front part 27 of the section of section 1 will be at most equal to one third of the total length of said section of section 1, as shown in FIG. 12, and in this case, the tube 9 located in the extension of the tubular compartment 4 will be separated in the mid-plane to the two identical tubular compartments 2 and 3 so that it is substantially perpendicular to the tubular compartment 4. Thus, the frame according to the invention has the advantage of having an upper beam , a lower beam and a rear fork made from a single profile, which reduces the number of operations, manipulations and assembly, while offering high performance bicycles. In addition, the use in specific areas of tubes or tubular compartments with concave walls connected by connecting areas makes it possible to produce a frame having high lateral rigidity and resistance to torsion while ensuring flexibility in the vertical direction. .

Claims

R E VE N D I C A T O N S RE VE NDICATONS
1. Profilé à contour fermé d'axe longitudinal X, caractérisé en ce qu'il comprend trois compartiments tubulaires internes (2,3,4) s'étendant suivant l'axe longitudinal X, chaque compartiment (2,3,4) ayant une cloison externe (21,31,41) définissant au moins partiellement le contour dudit profilé (1) et une cloison interne (22,32,42) délimitant partiellement un évidement intercalaire (5) s'étendant radialement jusqu'au contour dudit profilé (1) en formant des zones de liaison sécables (6,7,8) entre lesdits compartiments (2,3,4).1. Profile with closed contour of longitudinal axis X, characterized in that it comprises three internal tubular compartments (2,3,4) extending along the longitudinal axis X, each compartment (2,3,4) having an external partition (21,31,41) defining at least partially the contour of said profile (1) and an internal partition (22,32,42) partially delimiting an intermediate recess (5) extending radially to the contour of said profile (1) by forming breakable connecting zones (6,7,8) between said compartments (2,3,4).
2. Profilé selon la revendication 1, caractérisé en ce que les cloisons internes (22, 32, 42) sont disjointes de façon à définir sur le contour du profil des tronçons de liaison (6,7,8) dont les dimensions sont suffisantes pour permettre la rupture de la liaison sans provoquer l'ouverture des compartiments (2,3,4).2. Profile according to claim 1, characterized in that the internal partitions (22, 32, 42) are disjoint so as to define on the contour of the profile connecting sections (6,7,8) whose dimensions are sufficient for allow the connection to be broken without causing the compartments to open (2,3,4).
3. Profilé selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdits compartiments (2,3,4) ont les parois internes (22,32,42) concaves.3. Profile according to any one of the preceding claims, characterized in that said compartments (2,3,4) have internal walls (22,32,42) concave.
4. Profilé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il présente un contour elliptique.4. Profile according to any one of the preceding claims, characterized in that it has an elliptical contour.
5. Profilé selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'il présente un contour circulaire.5. Profile according to any one of claims 1 to 3, characterized in that it has a circular contour.
6. Profilé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est réalisé avec un métal extrudé tel que de l'aluminium.6. Profile according to any one of the preceding claims, characterized in that it is made with an extruded metal such as aluminum.
7. Profilé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend au moins deux compartiments (2,3) tubulaires identiques.7. Profile according to any one of the preceding claims, characterized in that it comprises at least two identical tubular compartments (2,3).
8. Procédé de fabrication d'un cadre de bicyclette à partir dudit profilé selon la revendication 7, caractérisé en ce qu'on coupe ledit profilé afin d'obtenir un tronçon de profilé (1) de longueur prédéterminée puis on le cintre suivant un plan médian aux deux compartiments tubulaires identiques de telle manière que le compartiment tubulaire (4) soit disposé radialement à l'intérieur de la courbure de cintrage (C), on découpe les deux zones de liaison (7,8) situées entre le compartiment tubulaire (4) et les deux compartiments identiques (2,3) sur une longueur (L) au moins égale à la longueur (1) de la découpe de la zone de liaison (6) située entre les deux compartiments tubulaires identiques (2,3), et inférieure à la longueur du tronçon profilé (1), de façon à obtenir trois tubes indépendants (9,10,11) ; on écarte le tube (9) situé dans le prolongement du compartiment tubulaire (4) dans le plan médian pour réaliser une "poutre" inférieure et les deux tubes situés (10,11) dans le prolongement des deux compartiments tubulaires identiques (2,3) l'un de l'autre afin de réaliser une fourche arrière de bicyclette ; on usine les extrémités libres de la fourche arrière pour créer des moyens de fixation (12) de la roue arrière, on assemble le cadre en fixant un embout de direction (19) à l'extrémité avant du tronçon profilé (1), un embout de pédalier (13) à l'extrémité libre du tube (9) formant la poutre inférieure, ledit embout de pédalier (13) permettant de raccorder ladite poutre inférieure à un élément de support de selle (17) coopérant avec des moyens de calage (18,19) montés à l'intérieur de la fourche arrière.8. A method of manufacturing a bicycle frame from said section according to claim 7, characterized in that said section is cut in order to obtain a section of section (1) of predetermined length then it is bent along a plane median to the two identical tubular compartments so that the tubular compartment (4) is arranged radially inside the bending curvature (C), the two connecting zones (7,8) located between the tubular compartment ( 4) and the two compartments identical (2,3) over a length (L) at least equal to the length (1) of the cutout of the connection zone (6) located between the two identical tubular compartments (2,3), and less than the length the profiled section (1), so as to obtain three independent tubes (9,10,11); the tube (9) located in the extension of the tubular compartment (4) is moved aside in the median plane to produce a lower "beam" and the two tubes located (10,11) in the extension of the two identical tubular compartments (2,3 ) from each other to make a rear bicycle fork; the free ends of the rear fork are machined to create fixing means (12) for the rear wheel, the frame is assembled by fixing a steering end piece (19) to the front end of the profiled section (1), a end piece bottom bracket (13) at the free end of the tube (9) forming the bottom beam, said bottom bracket (13) for connecting said bottom beam to a saddle support element (17) cooperating with wedging means ( 18,19) mounted inside the rear fork.
9. Procédé selon la revendication 8, caractérisé en ce qu'on écrase et on poinçonne lesdites extrémités libres de la fourche pour créer des moyens de fixation (12) de la roue arrière. 9. Method according to claim 8, characterized in that the said free ends of the fork are crushed and punched to create fixing means (12) of the rear wheel.
10. Procédé selon la revendication 8, caractérisé en ce qu'on découpe une portion de l'extrémité libre de la poutre inférieure avant l'assemblage de cadre.10. Method according to claim 8, characterized in that a portion of the free end of the lower beam is cut before the frame assembly.
11. Procédé selon la revendication 8, caractérisé en ce qu'on traite thermiquement le tronçon de profilé (1) avant l'assemblage du cadre.11. Method according to claim 8, characterized in that the section of section (1) is heat treated before assembly of the frame.
12. Cadre de bicyclette du type comprenant une fourche arrière, une poutre supérieure, une poutre inférieure et un élément de support de selle (17), caractérisé en ce qu'une première portion avant (27) du cadre est constituée par un profilé à contour fermé qui comprend deux compartiments tubulaires identiques (2,3) internes et un compartiment tubulaire inférieur (4) interne, chaque compartiment (2,3,4) ayant une cloison externe (21,31,41) définissant au moins partiellement le contour dudit profilé et une cloison interne (22,32,42) délimitant partiellement un évidement intercalaire (5) s'étendant radialement jusqu'au contour dudit profilé en formant des zones de liaison (6,7,8) entre les compartiments (2,3,4) et en ce que dans une seconde portion située en arrière de la première portion (27), ledit profilé se scinde en trois tubes (9,10,11) divergents prolongeant chacun l'un des trois compartiments (2,3,4), la poutre inférieure étant constituée par le tube (9) situé dans le prolongement du compartiment tubulaire inférieur (4), et la fourche arrière solidaire de la poutre supérieure étant constituée par les deux tubes (10,11) situés dans le prolongement des deux compartiments tubulaires identiques (2,3) entre lesquels est disposé l'élément de support de selle (17).12. Bicycle frame of the type comprising a rear fork, an upper beam, a lower beam and a saddle support element (17), characterized in that a first front portion (27) of the frame is constituted by a profile with closed contour which comprises two identical internal tubular compartments (2,3) and an internal lower tubular compartment (4), each compartment (2,3,4) having an external partition (21,31,41) defining at least partially the contour of said profile and an internal partition (22, 32, 42) partially delimiting an intermediate recess (5) extending radially as far as the contour of said profile by forming connection zones (6, 7, 8) between the compartments (2, 3,4) and in that in a second portion located in rear of the first portion (27), said section splits into three divergent tubes (9,10,11) each extending one of the three compartments (2,3,4), the lower beam being constituted by the tube (9 ) located in the extension of the lower tubular compartment (4), and the rear fork secured to the upper beam being constituted by the two tubes (10,11) located in the extension of the two identical tubular compartments (2,3) between which is arranged the saddle support element (17).
13. Cadre de bicyclette selon la revendication 12, caractérisé en ce que l'élément de support de selle (17) est relié à l'extrémité libre de la poutre inférieure par un raccord de pédalier (13) comprenant un premier embout (16) de profil complémentaire à la section de l'extrémité libre de la poutre inférieure, de façon à permettre son insertion, un deuxième embout (15) de profil complémentaire à la section de l'élément de support de selle (17) de façon à permettre son insertion et un alésage (14) transversal destiné à loger l'axe du pédalier.13. Bicycle frame according to claim 12, characterized in that the saddle support element (17) is connected to the free end of the lower beam by a bottom bracket connector (13) comprising a first end piece (16) of complementary profile to the section of the free end of the lower beam, so as to allow its insertion, a second end piece (15) of profile complementary to the section of the saddle support element (17) so as to allow its insertion and a transverse bore (14) intended to accommodate the axle of the crankset.
14. Cadre de bicyclette selon la revendication 12, caractérisé en ce que l'extrémité de la portion avant (27) du cadre est reliée à la fourche avant par un raccord de direction (19) comprenant un embout (20) de profil complémentaire à la section de l'extrémité de la portion avant (27) du cadre de façon à permettre son insertion et un alésage (30) verticale destiné à loger l'axe de direction de la fourche avant.14. Bicycle frame according to claim 12, characterized in that the end of the front portion (27) of the frame is connected to the front fork by a steering connector (19) comprising an end piece (20) of profile complementary to the section of the end of the front portion (27) of the frame so as to allow its insertion and a vertical bore (30) intended to accommodate the steering axis of the front fork.
15. Cadre de bicyclette selon la revendication 12, caractérisé en ce que la poutre supérieure est constituée par la première portion avant du cadre (27) et par les compartiments tubulaires identiques (2,3) et/ou les tubes (10,11) formant ladite fourche arrière.15. Bicycle frame according to claim 12, characterized in that the upper beam is constituted by the first front portion of the frame (27) and by the identical tubular compartments (2,3) and / or the tubes (10,11) forming said rear fork.
16. Cadre de bicyclette selon l'une des revendications 12 à 15, caractérisé en ce que l'élément de support de selle (17) est maintenu entre les deux tubes (10,11) situés dans le prolongement des deux compartiments tubulaires identiques par des moyens de calage (2,3).16. Bicycle frame according to one of claims 12 to 15, characterized in that the saddle support element (17) is held between the two tubes (10,11) located in the extension of the two identical tubular compartments by wedging means (2,3).
17. Cadre de bicyclette selon la revendication 16, caractérisé en ce que les moyens de calage sont constitués d'un seul élément (19) dont les faces latérales (20) sont en contact avec la paroi desdits tubes (10,11) situés dans le prolongement des deux compartiments tubulaires identiques (2,3), ledit élément (19) étant, en outre, pourvu d'un alésage (28) permettant le passage de l'élément de support de selle (17). 17. Bicycle frame according to claim 16, characterized in that the wedging means consist of a single element (19) whose lateral faces (20) are in contact with the wall of said tubes (10,11) located in the extension of the two identical tubular compartments (2,3), said element (19) being, moreover, provided with a bore (28) allowing the passage of the saddle support element (17).
18. Cadre de bicyclette selon la revendication 17, caractérisé en ce que l'extrémité arrière dudit élément (19) présente une courbure concave (29) de façon à permettre la libre rotation de la roue arrière.18. Bicycle frame according to claim 17, characterized in that the rear end of said element (19) has a concave curvature (29) so as to allow the free rotation of the rear wheel.
19. Cadre de bicyclette selon la revendication 16, caractérisé en ce que les moyens de calage sont constitués de deux éléments (18) complémentaires chaque élément (18) ayant une première face latérale19. Bicycle frame according to claim 16, characterized in that the wedging means consist of two elements (18) complementary each element (18) having a first side face
(23) en contact avec la paroi d'un tube (10,11) et une seconde face latérale (24) en contact avec l'autre élément, la seconde face latérale(23) in contact with the wall of a tube (10,11) and a second lateral face (24) in contact with the other element, the second lateral face
(24) étant pourvue d'un alésage partiellement cylindrique (25) destiné par assemblage avec l'alésage de l'élément complémentaire à permettre le passage de l'élément de support de selle (17).(24) being provided with a partially cylindrical bore (25) intended by assembly with the bore of the complementary element to allow the passage of the saddle support element (17).
20. Cadre de bicyclette selon la revendication 19, caractérisé en ce que l'extrémité arrière de chaque élément (18) présente une courbure (26) de façon à permettre la libre rotation de la roue arrière. 20. Bicycle frame according to claim 19, characterized in that the rear end of each element (18) has a curvature (26) so as to allow the free rotation of the rear wheel.
21. Cadre de bicyclette selon la revendication 15, caractérisé en ce que l'extrémité arrière de chaque tube (10,11) situé dans le prolongement d'un des deux compartiments tubulaires identiques (2,3) présente une section aplatie.21. Bicycle frame according to claim 15, characterized in that the rear end of each tube (10,11) located in the extension of one of the two identical tubular compartments (2,3) has a flattened section.
22. Cadre de bicyclette selon la revendication 15, caractérisé en ce que l'extrémité libre de chaque tube (10,11) situé dans le prolongement d'un des deux compartiments tubulaires identiques (2,3) est pourvue d'une encoche (12) de façon à permettre la fixation de l'axe de la roue arrière d'une bicyclette.22. Bicycle frame according to claim 15, characterized in that the free end of each tube (10,11) located in the extension of one of the two identical tubular compartments (2,3) is provided with a notch ( 12) so as to allow the fixing of the axis of the rear wheel of a bicycle.
23. Cadre de bicyclette selon l'une quelconque des revendications précédentes caractérisé en ce que le profilé (1) est réalisé avec un métal extrudé tel que de l'aluminium. 23. Bicycle frame according to any one of the preceding claims, characterized in that the profile (1) is produced with an extruded metal such as aluminum.
PCT/EP1999/003452 1998-05-20 1999-05-19 Bicycle frame, method for making same and structural bar for making same WO1999059865A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU43637/99A AU4363799A (en) 1998-05-20 1999-05-19 Bicycle frame, method for making same and structural bar for making same

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Application Number Priority Date Filing Date Title
FR9806376A FR2778966A1 (en) 1998-05-20 1998-05-20 Bicycle frame made from tubular extrusion with inner partitions
FR98/06376 1998-05-20

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004005122A1 (en) * 2002-07-05 2004-01-15 Colnago Ernesto E C. S.R.L Bicycle frame with improved mechanical strength
DE102011053733A1 (en) * 2011-09-18 2013-03-21 Karsten Bettin Bicycle frame made of extruded hollow profile
WO2013041093A1 (en) * 2011-09-23 2013-03-28 Bettin Karsten Frame for bicycles
DE102011122836A1 (en) * 2011-10-17 2013-04-18 Karsten Bettin Compact, collapsible bike
EP2653371A1 (en) * 2012-04-17 2013-10-23 Bhbikes Europe, S.L. Frame with an integrated battery for a pedal-assist bicycle and process for producing said frame
WO2017004821A1 (en) * 2015-07-09 2017-01-12 许理彦 Cross bar type bicycle structure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1544092A1 (en) * 2003-12-18 2005-06-22 Ideal Bike Corporation Bicycle frame for female

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FR327724A (en) * 1902-07-08 1903-06-30 Rozier Jules Fork that can fit bicycles, tricycles, tandems, etc.
GB191322568A (en) * 1913-10-07 1914-10-07 Harry Joyce Improvements in or relating to Tubes or the like and to the Manufacture of same.
US5011172A (en) * 1989-01-30 1991-04-30 Bellanca August T Lightweight bicycle with improved front and rear wheel fork and method of constructing same
DE19712326A1 (en) * 1997-03-25 1998-10-01 Hans Schauff Fahrradfabrik Bicycle frame

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR327724A (en) * 1902-07-08 1903-06-30 Rozier Jules Fork that can fit bicycles, tricycles, tandems, etc.
GB191322568A (en) * 1913-10-07 1914-10-07 Harry Joyce Improvements in or relating to Tubes or the like and to the Manufacture of same.
US5011172A (en) * 1989-01-30 1991-04-30 Bellanca August T Lightweight bicycle with improved front and rear wheel fork and method of constructing same
DE19712326A1 (en) * 1997-03-25 1998-10-01 Hans Schauff Fahrradfabrik Bicycle frame

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004005122A1 (en) * 2002-07-05 2004-01-15 Colnago Ernesto E C. S.R.L Bicycle frame with improved mechanical strength
DE102011053733A1 (en) * 2011-09-18 2013-03-21 Karsten Bettin Bicycle frame made of extruded hollow profile
WO2013037369A1 (en) 2011-09-18 2013-03-21 Bettin Karsten Bicycle frame
DE102011053733B4 (en) * 2011-09-18 2013-07-25 Karsten Bettin Bicycle frame made of an extruded hollow profile
WO2013041093A1 (en) * 2011-09-23 2013-03-28 Bettin Karsten Frame for bicycles
DE102011122836A1 (en) * 2011-10-17 2013-04-18 Karsten Bettin Compact, collapsible bike
DE102011122836B4 (en) * 2011-10-17 2013-07-25 Karsten Bettin Compact, collapsible bike
US9051021B2 (en) 2011-10-17 2015-06-09 Karsten Bettin Compact, collapsible bicycle
EP2653371A1 (en) * 2012-04-17 2013-10-23 Bhbikes Europe, S.L. Frame with an integrated battery for a pedal-assist bicycle and process for producing said frame
WO2017004821A1 (en) * 2015-07-09 2017-01-12 许理彦 Cross bar type bicycle structure

Also Published As

Publication number Publication date
FR2778966A1 (en) 1999-11-26
AU4363799A (en) 1999-12-06

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