FR2464876A1 - Tubular bicycle frames with polyurethane foam cores - cast and bonded in situ to increase specific stiffness - Google Patents
Tubular bicycle frames with polyurethane foam cores - cast and bonded in situ to increase specific stiffness Download PDFInfo
- Publication number
- FR2464876A1 FR2464876A1 FR7922729A FR7922729A FR2464876A1 FR 2464876 A1 FR2464876 A1 FR 2464876A1 FR 7922729 A FR7922729 A FR 7922729A FR 7922729 A FR7922729 A FR 7922729A FR 2464876 A1 FR2464876 A1 FR 2464876A1
- Authority
- FR
- France
- Prior art keywords
- polyurethane foam
- frame
- bicycle frame
- bonded
- situ
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229920005830 Polyurethane Foam Polymers 0.000 title claims description 11
- 239000011496 polyurethane foam Substances 0.000 title claims description 11
- 238000011065 in-situ storage Methods 0.000 title 1
- 239000006260 foam Substances 0.000 abstract description 6
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 229920005749 polyurethane resin Polymers 0.000 abstract 1
- 230000035939 shock Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 3
- 102000004315 Forkhead Transcription Factors Human genes 0.000 description 2
- 108090000852 Forkhead Transcription Factors Proteins 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 210000001364 upper extremity Anatomy 0.000 description 1
- 230000004584 weight gain Effects 0.000 description 1
- 235000019786 weight gain Nutrition 0.000 description 1
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
- B62K19/18—Joints between frame members
-
- 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
- B62K19/16—Cycle frames characterised by material or cross-section of frame members the material being wholly or mainly of plastics
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
Description
L'invention a trait à un élément tubulaire creux renforcé. The invention relates to a reinforced hollow tubular element.
On réalise à partir d'éléments tubulaires creux des constructions utilisées, notamment dans l'industrie aéronautique, l'industrie nautique, l'industrie du bâtiment, l'industrie mécanique, l'industrie des véhicules tels qu'automobiles, cycles et autres. Constructions are used from hollow tubular elements, in particular in the aeronautical industry, the nautical industry, the building industry, the mechanical industry, the vehicle industry such as automobiles, cycles and others.
Il est fréquemment nécessaire que ces constructions, à base d'éléments tubulaires, doivent présenter deux caractéristiques essentielles : d'une part, elles doivent être légères et, d'autre part, elles doivent être résistantes. It is frequently necessary that these constructions, based on tubular elements, must have two essential characteristics: on the one hand, they must be light and, on the other hand, they must be resistant.
Fréquemment, l'une des caractéristiques se fait au détriment de l'autre.Frequently, one of the characteristics is to the detriment of the other.
Ci-dessous sera décrite, à titre d'exemple non limitatif, une construction particulière réalisée à partir d'un ensemble d'éléments tubulaires creux. Below will be described, by way of nonlimiting example, a particular construction made from a set of hollow tubular elements.
Ainsi, on connaît depuis fort longtemps les bicyclettes comportant un cadre. Celui-ci se compose essentiellement d'intube horizontal, dont l'extrémité avant est solidaire d'un raccord de direction haut et dont l'extrémité arrière est solidaire d'un raccord de selle ; d'une douille de direction intercalée entre le raccord de direction haut et un raccord de direction bas ; d'une fourche constituée d'un pivot de direction, d'une tête de fourche, de deux fourreaux pourvus d'une patte avant et de deux chasses formées de deux haubans et de deux bases reliés entre eux par les pattes arrière. Le raccord de selle est relié par un tube vertical à une boîte de pédalier. De même, le raccord de direction est relié par un tube diagonal à la même boîte de pédalier. Les bases des chasses forment éléments de liaison entre la boîte de pédalier et les pattes arrière.Les haubans forment éléments de liaison entre le raccord de selle et les pattes arrière. Thus, bicycles with a frame have been known for a very long time. This essentially consists of a horizontal intube, the front end of which is secured to a top steering connection and the rear end of which is secured to a saddle connection; a steering sleeve interposed between the top steering fitting and a bottom steering fitting; a fork consisting of a steering pivot, a fork head, two sheaths provided with a front leg and two chases formed by two shrouds and two bases connected together by the rear legs. The seat connector is connected by a vertical tube to a bottom bracket. Likewise, the steering connector is connected by a down tube to the same bottom bracket. The bases of the chases form connecting elements between the bottom bracket and the rear dropouts. The seat stays form connecting elements between the saddle connection and the rear dropouts.
Pour alléger la bicyclette, on a diminué soit le diamètre des tubes, soit l'épaisseur des tubes, ce qui a entraîné une diminution des résistances mécaniques à la flexion, à la torsion et au cisaillement. De ce fait, en cas de chute et/ou de contre-coups violents dûs à une irrégularité de la chaussée, il y a déformation et/ou affaissement du cadre, voire même cassure de l'un ou de l'autre élément tubulaire composant le cadre. To lighten the bicycle, either the diameter of the tubes or the thickness of the tubes was reduced, which resulted in a reduction in the mechanical resistance to bending, twisting and shearing. As a result, in the event of a fall and / or a violent impact due to an irregularity of the roadway, there is deformation and / or sagging of the frame, or even breakage of one or the other tubular component. the framework.
Le but principal de cette invention a pour objet de renforcer, d'alléger et d'augmenter le moment d'inertie de tout corps creux sans tenir compte de ses formes géométriques. A la base d'éléments tubulaires creux renforcés, conformes à l'invention, il est possible d'obtenir un cadre de bicyclette allégé sans diminuer les résistances mécaniques, voire même augmenter ces résistances. The main purpose of this invention is to strengthen, lighten and increase the moment of inertia of any hollow body without taking into account its geometric shapes. At the base of reinforced hollow tubular elements, in accordance with the invention, it is possible to obtain a lightened bicycle frame without reducing the mechanical strengths, or even increasing these strengths.
A cet effet, l'invention concerne un élément tubulaire creux renforcé caractérisé en ce qu'il comporte une âme en mousse de polyuréthane injectée après recouvrement de la paroi interne d'un apprêt approprié assurant une liaison indissoluble entre l'élément tubulaire creux et la mousse de polyuréthane injectée. To this end, the invention relates to a reinforced hollow tubular element characterized in that it comprises a core of polyurethane foam injected after covering the internal wall with a suitable primer ensuring an indissoluble bond between the hollow tubular element and the injected polyurethane foam.
L'insention présente plusieurs avantages, à savoir - permet la réduction d'épaisseur des tubes d'acier sans eirinuer les résistances mécaniques tels que flexion, torsion, cisaillement, au contraire améliore ces résistances - permet de réduire le diamètre des tubes du cadre sans toucher à l'épaisseur et de conserver les résistances mécaniques des tubes normaux non injectés.De ce fait, il y a la possibilité de fabriquer des bicyclettes du type "Fine" et "Superfine" au niveau de l'esthétique ; - permet, éventuellement, la fabrication de bicyclettes en tubes en aluminium, en plastique ou toutes autres matières amenant un gain de poids au cadre - par le jeu de la densité de la mousse de polyuréthane, il y a la possibilité de réaliser des cadres de solidités différentes en fonction de leur utilisation. The invention has several advantages, namely - allows the reduction of thickness of the steel tubes without eliminating the mechanical resistances such as bending, torsion, shear, on the contrary improves these resistances - makes it possible to reduce the diameter of the tubes of the frame without touch the thickness and keep the mechanical strengths of the normal non-injected tubes. Therefore, there is the possibility of manufacturing bicycles of the "Fine" and "Superfine" type in terms of aesthetics; - allows, possibly, the manufacture of bicycles in aluminum tubes, plastic or any other material bringing a weight gain to the frame - by the play of the density of the polyurethane foam, there is the possibility of making frames of different solidities depending on their use.
L'invention sera ben comprise en se référant à la description suivante faite à titre d'exemple non limitatif et au dessin ci-annexé dans lequel - la figure unique est une vue en élévation d'un cadre de bicyclette conforme à l'invention. The invention will be understood by referring to the following description given by way of nonlimiting example and to the attached drawing in which - the single figure is an elevational view of a bicycle frame according to the invention.
Selon l'invention, on prend des éléments tubulaires creux que l'on découpe à la longueur désirée. Puis, par des moyens connus, on pourvoit la paroi interne d'un apprêt qui adhère parfaitement à la paroi interne des tubes et qui assure un accrochage parfait de la mousse en polyuréthane injectée. According to the invention, hollow tubular elements are taken which are cut to the desired length. Then, by known means, the internal wall is provided with a primer which adheres perfectly to the internal wall of the tubes and which ensures perfect attachment of the injected polyurethane foam.
Une utilisation particulière d'ur. ensemble tubulaire conforme à l'invention est décrite ci-desseus à titre d'exemple non limitatif. A particular use of ur. tubular assembly according to the invention is described below by way of nonlimiting example.
Le cadre de bicyclette 1 comporte un tube horizontal 2. L'extrémité avant 3 est enfilée puis rendue solidaire d'un raccord de direction haut 4. L'extrémité arrière 5 est rendue solidaire d'un raccord de selle 6. Le raccord de direction haut 4 coiffe l'extrémité supérieure 7 d'une douille de direction 8 dont l'extrémité inférieure 9 est solidaire d'un raccord de direction bas 10. The bicycle frame 1 comprises a horizontal tube 2. The front end 3 is threaded and then made integral with a top steering connector 4. The rear end 5 is made integral with a seat connector 6. The steering connector top 4 covers the upper end 7 of a steering socket 8, the lower end 9 of which is secured to a bottom steering fitting 10.
Ce raccord de direction bas 10 repose sur une tête de fourche 11 dans laquelle est fixée l'extrémité supérieure 12 de deux fourreaux 13 dont l'extrémité inférieure 14 est pourvue d'une patte avant 15. Ces pattes avant 15 permettent de maintenir la roue avant (non représentée) disposée entre les deux fourreaux 13.This bottom direction fitting 10 rests on a fork head 11 in which is fixed the upper end 12 of two sleeves 13, the lower end 14 of which is provided with a front lug 15. These front lugs 15 make it possible to maintain the wheel. front (not shown) disposed between the two sleeves 13.
Le raccord de direction bas 1C sert d'élément de liaison entre la douille de direction 8 et l'extrémité supérieure 16 d'un tube diagonal 17 dont l'extré- mité inférieure 18 est solidaire d'une botte de pédalier 19. Dans cette boîte de pédalier 19 est engagée l'extrémité inférieure 20 d'un tube vertical 21 dont l'extrémité supérieure 22 est solidaire du raccord de selle 6. The bottom steering connector 1C serves as a connecting element between the steering bush 8 and the upper end 16 of a down tube 17, the lower end 18 of which is secured to a bottom bracket 19. bottom bracket 19 is engaged the lower end 20 of a vertical tube 21 whose upper end 22 is integral with the seat fitting 6.
Le cadre 1 comporte deux chasses composées de deux haubans 23, dor.t ltex- trémité supérieure 24 est solidaire du raccord de selle 6 et dont l'extrémité inférieure 25 est pourvue d'une patte arrière 26 maintenant la roue arrière (non représentée), et de deux bases 27 dont l'extrémité 28 est solidaire de la boîte de pédalier 19 et dont l'autre extrémité 29 est solidaire de la patte arrière 26. Bien entendu, les différents éléments tubulaires présentent des trous d'évent et les parois internes ont été recouvertes de l'apprêt assurant la liaison parfaite entre les éléments tubulaires et la mousse en polyuréthane. The frame 1 comprises two chases made up of two shrouds 23, dor.t ltex- upper end 24 is integral with the seat connection 6 and whose lower end 25 is provided with a rear lug 26 holding the rear wheel (not shown) , and two bases 27, the end 28 of which is secured to the bottom bracket 19 and the other end 29 of which is secured to the rear dropout 26. Of course, the various tubular elements have vent holes and the walls internals were covered with primer ensuring the perfect connection between the tubular elements and the polyurethane foam.
Après montage du cadre, on injecte à travers la boîte de pédalier 19 de la mousse de polyuréthane dans le cadre 1. Cette mousse se répand à travers les éléments tubulaires creux en chassant l'air renfermé à travers les trous d'évent. Après remplissage, on procède à l'évidement de la mousse dans la douille de direction 8 pour la mise en place du pivot de direction et dans le tube vertical 21 pour l'introduction de la tige de la selle. En ce qui concerne la boîte de pédalier 19, on élimine la mousse en procédant à un nouveau taraudage pour la mise en place du mécanisme du pédalier. After assembly of the frame, polyurethane foam is injected through the bottom bracket 19 into the frame 1. This foam spreads through the hollow tubular elements by expelling the enclosed air through the vent holes. After filling, the foam is hollowed out in the steering bush 8 for the installation of the steering pivot and in the vertical tube 21 for the introduction of the seat post. As regards the bottom bracket 19, the foam is eliminated by carrying out a new tapping for the installation of the bottom bracket mechanism.
Selon un autre mode de réalisation, les éléments tubulaires et, notamment le tube horizontal 2, le tube vertical 21 et le tube diagonal 17 peuvent présenter des rétrécissements 30 représentés par les lignes pointillées pour rehausser l'aspect de finesse du cadre. According to another embodiment, the tubular elements and, in particular the horizontal tube 2, the vertical tube 21 and the diagonal tube 17 may have narrowing 30 represented by the dotted lines to enhance the appearance of finesse of the frame.
Bien que l'invention ait été décrite à propos d'une forme de réalisation particulière, il est bien entendu qu'elle n'y est nullement limitée et qu'on peut y apporter diverses modifications de formes, de matériaux et de combinaisons de ces divers éléments sans pour cela s'éloigner du cadre et de l'esprit de l'invention. Although the invention has been described in connection with a particular embodiment, it is understood that it is in no way limited thereto and that it is possible to make various modifications to the forms, materials and combinations of these. various elements without departing from the scope and spirit of the invention.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7922729A FR2464876A1 (en) | 1979-09-06 | 1979-09-06 | Tubular bicycle frames with polyurethane foam cores - cast and bonded in situ to increase specific stiffness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7922729A FR2464876A1 (en) | 1979-09-06 | 1979-09-06 | Tubular bicycle frames with polyurethane foam cores - cast and bonded in situ to increase specific stiffness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2464876A1 true FR2464876A1 (en) | 1981-03-20 |
| FR2464876B1 FR2464876B1 (en) | 1982-04-30 |
Family
ID=9229572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7922729A Granted FR2464876A1 (en) | 1979-09-06 | 1979-09-06 | Tubular bicycle frames with polyurethane foam cores - cast and bonded in situ to increase specific stiffness |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2464876A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2512892A1 (en) * | 1981-09-17 | 1983-03-18 | Ouest Cie | Tubular metal assemblies with over-moulded thermoplastic joints - for constructing bicycle frames etc. |
| FR2546473A1 (en) * | 1983-05-24 | 1984-11-30 | Verre Tisse Sa | TUBULAR MATERIAL BASED ON A RESIN REINFORCED BY A TEXTILE MATERIAL AND BICYCLE FRAME OR SIMILAR VEHICLE MADE FROM SUCH A MATERIAL |
| EP0352663A3 (en) * | 1988-07-25 | 1990-11-14 | Look S.A. | Method for manufacturing a bicycle fork, and bicycle fork made by such a method |
| EP0590239A1 (en) * | 1992-09-26 | 1994-04-06 | Ching-Dong Pai | Pipe joining construction of a bicycle frame |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR808977A (en) * | 1935-09-17 | 1937-02-19 | Technik A G | Hollow body in light metal, having to withstand great efforts, and method for their manufacture |
| GB800197A (en) * | 1955-03-08 | 1958-08-20 | Nsu Werke Ag | Improvements in and relating to frames for motor-bicycles and the like |
| FR2212258A1 (en) * | 1972-12-29 | 1974-07-26 | Original Plastic Bike |
-
1979
- 1979-09-06 FR FR7922729A patent/FR2464876A1/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR808977A (en) * | 1935-09-17 | 1937-02-19 | Technik A G | Hollow body in light metal, having to withstand great efforts, and method for their manufacture |
| GB800197A (en) * | 1955-03-08 | 1958-08-20 | Nsu Werke Ag | Improvements in and relating to frames for motor-bicycles and the like |
| FR2212258A1 (en) * | 1972-12-29 | 1974-07-26 | Original Plastic Bike |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2512892A1 (en) * | 1981-09-17 | 1983-03-18 | Ouest Cie | Tubular metal assemblies with over-moulded thermoplastic joints - for constructing bicycle frames etc. |
| FR2546473A1 (en) * | 1983-05-24 | 1984-11-30 | Verre Tisse Sa | TUBULAR MATERIAL BASED ON A RESIN REINFORCED BY A TEXTILE MATERIAL AND BICYCLE FRAME OR SIMILAR VEHICLE MADE FROM SUCH A MATERIAL |
| EP0127553A3 (en) * | 1983-05-24 | 1985-10-23 | Technique Du Verre Tisse S.A. | Tubular material based on a resin reinforced with textile material and a frame for a bicycle or similar vehicle made from this material |
| EP0352663A3 (en) * | 1988-07-25 | 1990-11-14 | Look S.A. | Method for manufacturing a bicycle fork, and bicycle fork made by such a method |
| EP0590239A1 (en) * | 1992-09-26 | 1994-04-06 | Ching-Dong Pai | Pipe joining construction of a bicycle frame |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2464876B1 (en) | 1982-04-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |