FR2469343A2

FR2469343A2 - Pedal cycle with oval sprocket-wheel - has major axis of oval in line with saddle support tube and at given angle to cranks

Info

Publication number: FR2469343A2
Application number: FR7928220A
Authority: FR
Original assignee: Individual
Current assignee: Individual
Priority date: 1979-11-15
Filing date: 1979-11-15
Publication date: 1981-05-22

Abstract

The cycle with an oval crank wheel, to improve the pedalling action of the rider has the crank wheel formed by two circles with their centres spaced apart so that the circles overlap, and with their peripheries connected by intermediate curved portions. The major axis of this oval shape is on the line which forms the axis of the tube forming part of the cycle frame and having the saddle pillar extending from it. This is at right angles to the direction of travel. The two cranks which carry the pedals are along a line which forms an angle of between 80 and 90 degrees behind this major axis.

Description

Dans le brevet principal est décrit un pédalier notamment destiné à être monté sur des véhicules mus par la force musculaire d'un individu, en particulier les cycles, ce pédalier comportant un plateau ovalisé constitué de deux demi-cercles dentés de même rayon mais dont les centres sont séparés d'une certaine distance, ces deux demi-cercles étant réunis à leur périphérie par deux sections dentées de connexion de longueurs égales, symétriquement disposées par rapport a l'axe reliant les centres desdits demi-cercles, tandis que l'axe du pédalier est disposé à égale distance desdits cercles.In the main patent, a crankset is particularly described intended to be mounted on vehicles driven by the muscular strength of an individual, in particular cycles, this crankset comprising an oval plate consisting of two toothed semicircles of the same radius but whose centers are separated by a certain distance, these two semicircles being joined at their periphery by two toothed connecting sections of equal length, symmetrically arranged with respect to the axis connecting the centers of said semicircles, while the axis of the crankset is disposed at equal distance from said circles.

La présente addition se rapporte au positionnement spécial de la selle par rapport au pédalier décrit et revendiqué dans le brevet principal.The present addition relates to the special positioning of the saddle relative to the crankset described and claimed in the main patent.

Àu brevet principal, il est prévu d'utiliser une selle plus longue que la normale de façon que ltassise de l'utilisateur puisse 8tre à peu près à la verticale du centre du pédalier. In the main patent, it is intended to use a longer than normal saddle so that the user's seat can be approximately vertical to the center of the bottom bracket.

Cependant, à la suite d'expérimentation dudit pédalier, le demandeur s'est aperçu qu'afin de porter au maximum l'efficacité du plateau ovale dudit pédalier, il convient que l'axe du plateau ovalisé soit monté de-façon à se trouver dans un plan perpendiculaire au plan de roulage du cycle et passant sensiblement par le centre du support sur lequel la selle est montée. La présente addition vise également les nouvelles formes de plateau utilisées dans ce perfectionnement.However, following experimentation with said crankset, the applicant has noticed that in order to maximize the efficiency of the oval chainring of said crankset, the axis of the oval chainring should be mounted so as to be in a plane perpendicular to the rolling plane of the cycle and passing substantially through the center of the support on which the saddle is mounted. This addition also relates to the new plate shapes used in this improvement.

Ce perfectionnement sera mieux compris å la lecture de la description suivante, en référence au dessin annexe dans lequel s - la figure 1 est une vue latérale d'un cycle équipé selon la
présente addition ; et - les figures 2, 3 et 4 représentent chacune une forme de
réalisation de plateau ovalisé utilisable dans la présente
addition,
Sur la figure 1, on a matérialisé en pointillé un plan V perpendiculaire au plan F de roulage du cycle et passant à la fois par l'axe 5 du plateau ovalisé et par l'axe central C du support de la selle S.This improvement will be better understood on reading the following description, with reference to the accompanying drawing in which s - Figure 1 is a side view of a cycle equipped according to the
this addition; and - Figures 2, 3 and 4 each represent a form of
realization of oval tray usable in this
addition,
In Figure 1, there is shown in dotted line a plane V perpendicular to the plane F of rolling the cycle and passing both by the axis 5 of the oval plate and by the central axis C of the support of the saddle S.

Ce positionnement permet d'obtenir un rendement sensiblement égal à celui procuré par un pédalage en danseuse, tout en assurant au cycliste une assise confortable qui permet à ce dernier de doser exactement son effort en rapport avec le profil de la route et sa morphologie propre,
La figure 2 représente une forme de réalisation pouvant être utilisée comme grand plateau, tandis que les figures 3 et 4 représentent des formes de réalisation pouvant servir de deuxième ou petit plateau, notamment utilisable pour monter les côtes.This positioning makes it possible to obtain a performance substantially equal to that obtained by pedaling as a dancer, while ensuring the cyclist a comfortable seat which allows the latter to exactly measure his effort in relation to the profile of the road and his own morphology,
Figure 2 shows an embodiment which can be used as a large plate, while Figures 3 and 4 show embodiments which can serve as a second or small plate, in particular usable for mounting the ribs.

Les manivelles centrées sur l'arbre du pédalier sont positionnées sur une ligne faisant un angle de 80 k 900 vers l'arrière avec le grand axe du plateau.The cranks centered on the crankset shaft are positioned on a line making an angle of 80 k 900 backwards with the long axis of the chainring.

Ces plateaux se tracent d'après les indications des figures0
Les lignes arcéiformes C et D de ces trois plateaux sont toutes dessinées avec une ouverture de compas égale à leur grand axe A-B et vont de M à M et de N à N, la pointe du compas étant placée sur une ligne verticale coupant le grand axe du plateau en son milieu, et à une distance adéquate du centre du plateau. These trays are traced according to the indications of figures0
The arcuate lines C and D of these three plates are all drawn with a compass opening equal to their major axis AB and go from M to M and from N to N, the point of the compass being placed on a vertical line cutting the major axis of the tray in the middle, and at an adequate distance from the center of the tray.

Claims

1. Crankset in particular intended to be mounted on vehicles driven by the muscular strength of an individual, in particular the cycles, this crankset comprising an oval plate consisting of two toothed half-circles of the same radius but whose centers are separated by a certain distance, these two semicircles being joined at their periphery by two toothed connection sections of equal lengths, symmetrically disposed with respect to the axis connecting the centers of said semicircles, while the crankset axis is disposed equidistant from said circles, according to claim 1 of the main patent, characterized in that the axis of the oval plate is mounted so as X to lie in a plane perpendicular to the rolling plane of the cycle and passing substantially through the center of the support on which the saddle is mounted0

2. Crankset according to claim 1, characterized in that one uses ovalized chainrings whose cranks centered on the crankshaft are positioned on a line making an angle of 80 W 900 backwards with the major axis of the plateau.