FR2487769A1 - Frame for racing cycle - has recess matching shape of rear wheel, in tube between saddle and bottom bracket to reduce wheel base - Google Patents
Frame for racing cycle - has recess matching shape of rear wheel, in tube between saddle and bottom bracket to reduce wheel base Download PDFInfo
- Publication number
- FR2487769A1 FR2487769A1 FR8017698A FR8017698A FR2487769A1 FR 2487769 A1 FR2487769 A1 FR 2487769A1 FR 8017698 A FR8017698 A FR 8017698A FR 8017698 A FR8017698 A FR 8017698A FR 2487769 A1 FR2487769 A1 FR 2487769A1
- Authority
- FR
- France
- Prior art keywords
- tube
- rear wheel
- bottom bracket
- saddle
- frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/86—Making other particular articles other parts for bicycles or motorcycles
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Motorcycle And Bicycle Frame (AREA)
Abstract
Description
La présente invention concerne des cadres de cycle et plus particulièrement ceux adoptés par les véhicules à deux roues, telle la bicyclette employée pour la pratique du sport cycliste. The present invention relates to cycle frames and more particularly those adopted by two-wheeled vehicles, such as the bicycle used for the practice of cycling sport.
En raison d'un engouement certain pour ce sport et du développement important du nombre de ses pratiquants, on a vu et on voit apparaître sans cesse des équipements de plus en plus perfec tionnés et même souvent exagérément sophistiqués, dont la seule caractéristique notable est d'être d'un prix d'achat élevé. Because of a certain craze for this sport and the significant development of the number of its practitioners, we have seen and we see constantly appearing more and more perfected and even often overly sophisticated equipment, the only notable characteristic of which is 'be of a high purchase price.
Ainsi, pour ce qui intéresse la "petite reine", l'évolution a été fortement marquée, à compter des vingt dernières années, par l'utilisation de matériaux nouveaux visant à alléger son poids. Thus, for what interests the "little queen", the evolution has been strongly marked, from the last twenty years, by the use of new materials aimed at reducing its weight.
Cependant, peu d'améliorations ont été apportées dans la réalisation du cadre de la bicyclette, et notamment dans la forme du triangle avant - selle, tube de direction, boite de pédalier qui doit respecter des dimensions établies en fonction de la morphologie de l'homme. However, few improvements have been made in the realization of the bicycle frame, and in particular in the shape of the front triangle - saddle, head tube, bottom bracket which must respect the dimensions established according to the morphology of the man.
Quelques solutions ont été imaginées touchant à la géométrie du triangle arrière - selle, axe de la roue arrière, boîte de pédalier - dont la forme est plus particulièrement étudiée pour supporter la roue arrière. Il est à noter dans la géométrie de ce triangle arrière que seul le tube mitoyen aux deux triangles du cadre et reliant la boite de pédalier à la potence sur laquelle est montée la selle, respecte une longueur adaptée à la morphologie humaine. Some solutions have been imagined relating to the geometry of the rear triangle - saddle, rear wheel axle, bottom bracket - whose shape is more particularly studied to support the rear wheel. It should be noted in the geometry of this rear triangle that only the tube adjoining the two triangles of the frame and connecting the bottom bracket to the stem on which the saddle is mounted, respects a length adapted to human morphology.
Une de ces solutions, telle que proposée dans les demandes de brevets français n0 78.05113 et n0 79.08670, vise à réduire la distance séparant l'axe de la roue arrière au tube reliant la potence de la selle à la boite de pédalier, d'une longueur inférieure au rayon de la roue arrière. Elle porte à cet effet sur la constitution du tube sus-mentionne en deux éléments longitudinaux espacés l'un de l'autre pour autoriser le passage partiel de la roue arrière entre eux. One of these solutions, as proposed in French patent applications No. 78.05113 and No. 79.08670, aims to reduce the distance separating the axis of the rear wheel from the tube connecting the stem of the saddle to the bottom bracket, by length less than the radius of the rear wheel. To this end, it relates to the constitution of the above-mentioned tube in two longitudinal elements spaced from one another to allow the partial passage of the rear wheel between them.
Le cadre de cycle muni d'un tel triangle arrière offre, par rapport à un cadre de conception classique, de nombreux avantages à la bicyclette qu'il équipe, notamment au stade de la compétition. The cycle frame provided with such a rear triangle offers, compared to a frame of conventional design, many advantages to the bicycle which it equips, in particular at the competition stage.
En effet, tout en augmentant la rigidité du cadre, le triangle arrière, aux dimensions réduites, permet de raccourcir le le moyen de transmission entre la boite de pédalier et l'axe de la roue arrière et, par conséquent, d'augmenter le rendement mécanique du cycliste. Ce rendement est également développé par le tassement de la partie arrière de la bicyclette que provoque le rapprochement du centre de gravite vers l'axe de la roue arrière. Indeed, while increasing the rigidity of the frame, the rear triangle, with reduced dimensions, makes it possible to shorten the transmission means between the bottom bracket and the axis of the rear wheel and, consequently, to increase the output cyclist mechanics. This efficiency is also developed by the compaction of the rear part of the bicycle which causes the center of gravity to move towards the axis of the rear wheel.
Suivant les mêmes objectifs, le demandeur a imaginé un cadre de cycle remarquable en ce que le tube reliant la boite de pédalier à la potence de selle adopte, dans sa partie basse à proximité de la boite de pédalier, la forme d'un arc de cercle ouvert vers l'axe de la roue arrière et dont le rayon de courbure est sensiblement égal au rayon de cette dernière. De prefe- rence, seule la paroi hémicylindrîque dudit tube située en regard de la roue arrière est incurvée. Following the same objectives, the applicant has imagined a remarkable cycle frame in that the tube connecting the bottom bracket to the saddle stem adopts, in its lower part near the bottom bracket, the shape of an arc of circle open towards the axis of the rear wheel and whose radius of curvature is substantially equal to the radius of the latter. Preferably, only the semi-cylindrical wall of said tube located opposite the rear wheel is curved.
L'intérêt d'un tel cadre par rapport à celui décrit dans les demandes de brevets précitées est d'offrir la même géométrie que celle d'un cadre classique et d'éviter ainsi de nuire à l'esthe- tique d'ensemble de la bicyclette tout en conservant les avantages d'un cadre réduit, tels qu'ils ont été évoqués ci-dessus. The advantage of such a frame compared to that described in the aforementioned patent applications is to offer the same geometry as that of a conventional frame and thus to avoid detracting from the overall aesthetics of riding a bicycle while retaining the advantages of a reduced frame, as mentioned above.
L'invention a également pour objet un dispositif permettant de donner au susdit tube l'empreinte en arc de cercle sur sa paroi hémicylindrique en regard de la roue arrière. Ce dispositif comprend
- d'une part, une matrice fixe formée d'une partie creuse allongée dans laquelle est calé ledit tube,
- et d'autre part, une matrice mobile formée d'une partie en relief adoptant le dessin d'un arc de cercle et destinée à être comprimée sur la paroi hémicylindrique du tube, lequel est retenu dans la partie creuse de la matrice fixe.The invention also relates to a device making it possible to give the aforesaid tube the imprint in an arc of a circle on its semi-cylindrical wall facing the rear wheel. This device includes
on the one hand, a fixed matrix formed by an elongated hollow part in which said tube is wedged,
- And secondly, a movable matrix formed by a raised part adopting the design of an arc of a circle and intended to be compressed on the semi-cylindrical wall of the tube, which is retained in the hollow part of the fixed matrix.
Les caractéristiques et les avantages de la présente invention ressortiront à la lecture de la description qui suit, donnant à titre d'exemple non limitatif eb en regard des dessins an nexés, un mode de réalisation d'un carre de bicyclette conforme à l'invention. The characteristics and advantages of the present invention will become apparent on reading the description which follows, giving by way of nonlimiting example eb with regard to the appended drawings, an embodiment of a bicycle rack in accordance with the invention .
Sur ces dessins
La figure 1 est une vue de profil d'une bicyclette comportant un tel cadre ;
La figure 2 est une vue de profil à une échelle plus grande d'un élément de ce cadre ;
La figure 3 est une vue selon A de l'élément de la figure 2
La figure 4 est une vue en perspective du dispositif permettant de réaliser l'élément des figures 2 et 3.On these drawings
Figure 1 is a side view of a bicycle having such a frame;
Figure 2 is a side view on a larger scale of an element of this frame;
Figure 3 is a view along A of the element of Figure 2
FIG. 4 is a perspective view of the device making it possible to produce the element of FIGS. 2 and 3.
La figure 5 est une vue en coupe verticale du dessin de la figure 4. FIG. 5 is a view in vertical section of the drawing in FIG. 4.
Ainsi qu'on peut le voir à la figure 1, la bicyclette représentee est formée de manière classique d'un cadre 1 supportant les deux roues avant 2a et arrière 2b et constitué d'un triangle avant la - selle 3, tube de direction 4, boite de pédalier 5 et d'un triangle arrière lb - selle 3, axe de la roue arrière 2b, boite de pédalier 5 -. As can be seen in Figure 1, the bicycle shown is conventionally formed of a frame 1 supporting the two front wheels 2a and rear 2b and consisting of a triangle before the - saddle 3, head tube 4 , bottom bracket 5 and a rear triangle 1b - seat 3, rear wheel axle 2b, bottom bracket 5 -.
Le tube 6, mitoyen aux deux triangles la et lb et reliant la selle 3 à la boite de pédalier 5, comporte, comme on peut le remarquer sur les dessins des figures 2 et 3, une partie 6a en arc de cercle dessinée dans sa moitié inférieure proche de la bolte 5, et ouverte vers l'axe de la roue 2b. The tube 6, adjoining the two triangles 1a and 1b and connecting the saddle 3 to the bottom bracket 5, comprises, as can be seen in the drawings in FIGS. 2 and 3, a part 6a in an arc drawn in its half lower close to the bolte 5, and open towards the axis of the wheel 2b.
Cette incurvation du tube 6 opérée uniquement sur la paroi hémicylindrique du tube en regard de la roue 2b permet, tout en conservant l'unité d'ensemble de la bicyclette, de diminuer la longueur des deux fourches 7 et 8 du triangle arrière supportant l'axe de la roue 2b et de rapprocher ainsi ledit axe du tube 6. This bending of the tube 6 operated only on the semi-cylindrical wall of the tube opposite the wheel 2b allows, while retaining the overall unity of the bicycle, to reduce the length of the two forks 7 and 8 of the rear triangle supporting the axis of the wheel 2b and thus bring said axis of the tube 6 closer.
Les avantages de ce rapprochement ont été énumérés au début du présent mémoire.The advantages of this combination have been listed at the beginning of this brief.
Le dispositif 9 représenté aux figures 4 et 5 permet de donner au tube 6 l'empreinte en arc de cercle 6a. Il comprend à cet effet
- une matrice fixe Sa formée d'une partie creuse allongée dans laquelle est calé le tube 6 ;
- et une matrice mobile 9b formée d'une partie en relief adoptant le dessin en arc de cercle de l'empreinte 6a et destinée à être comprimée (flèche P) par des moyens mécaniques, hydrauliques, pneumatiques ou autres... sur la paroi hémicylindrique du tube 6 retenu dans la partie creuse 9a.The device 9 shown in Figures 4 and 5 allows to give the tube 6 the impression in a circular arc 6a. He understands for this purpose
- A fixed matrix Sa formed by an elongated hollow part in which the tube 6 is wedged;
- And a movable matrix 9b formed of a raised part adopting the drawing in an arc of a circle of the imprint 6a and intended to be compressed (arrow P) by mechanical, hydraulic, pneumatic or other means ... on the wall semi-cylindrical tube 6 retained in the hollow part 9a.
Ce dispositif, représenté dans sa forme la plus élémentaire, est plus particulièrement indiqué pour réaliser en série des incurvations sur des tubes 6, et il sera agencé pour cette orientation sur une machine équipée des organes nécessaires pour automatiser une fabrication en série. This device, shown in its most basic form, is more particularly indicated for producing bends in series on tubes 6, and it will be arranged for this orientation on a machine equipped with the organs necessary to automate mass production.
Il est évident que de nombreuses modifications et variantes de l'invention peuvent être réalisées en se basant sur les enseignements ci-dessus donnés. Il est par conséquent bien entendu que, sans sortir du cadre des revendications annexées, l'invention peut être mise en oeuvre d'une manière différente de celle plus particulièrement décrite ci-dessus. It is obvious that many modifications and variants of the invention can be carried out based on the teachings given above. It is therefore clearly understood that, without departing from the scope of the appended claims, the invention can be implemented in a manner different from that more particularly described above.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8017698A FR2487769A1 (en) | 1980-08-01 | 1980-08-01 | Frame for racing cycle - has recess matching shape of rear wheel, in tube between saddle and bottom bracket to reduce wheel base |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8017698A FR2487769A1 (en) | 1980-08-01 | 1980-08-01 | Frame for racing cycle - has recess matching shape of rear wheel, in tube between saddle and bottom bracket to reduce wheel base |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2487769A1 true FR2487769A1 (en) | 1982-02-05 |
Family
ID=9245090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8017698A Withdrawn FR2487769A1 (en) | 1980-08-01 | 1980-08-01 | Frame for racing cycle - has recess matching shape of rear wheel, in tube between saddle and bottom bracket to reduce wheel base |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2487769A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4889355A (en) * | 1987-11-20 | 1989-12-26 | Trimble Brent J | Composite bicycle frames and methods of making same |
| US4902458A (en) * | 1987-05-12 | 1990-02-20 | Trimble Brent J | Method of molding composite bicycle frames |
| US4941674A (en) * | 1986-05-12 | 1990-07-17 | Trimble Brent J | Tubular bicycle frame |
| US4986949A (en) * | 1986-05-12 | 1991-01-22 | Trimble Brent J | Method of making composite bicycle frames |
-
1980
- 1980-08-01 FR FR8017698A patent/FR2487769A1/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4941674A (en) * | 1986-05-12 | 1990-07-17 | Trimble Brent J | Tubular bicycle frame |
| US4986949A (en) * | 1986-05-12 | 1991-01-22 | Trimble Brent J | Method of making composite bicycle frames |
| US5158733A (en) * | 1986-05-12 | 1992-10-27 | Trimble Brent J | Method of making composite cycle frame components |
| US4902458A (en) * | 1987-05-12 | 1990-02-20 | Trimble Brent J | Method of molding composite bicycle frames |
| US4889355A (en) * | 1987-11-20 | 1989-12-26 | Trimble Brent J | Composite bicycle frames and methods of making same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |