Mechanism for feature improvement for bicycles and other...

F - Mech Eng,Light,Heat,Weapons – 16 – H

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F16H 35/02 (2006.01) B62M 1/02 (2006.01) B62M 17/00 (2006.01) F16H 21/18 (2006.01) F16H 29/00 (2006.01)

Patent

CA 2171420

In the case of bicycles, the purpose of the new construction is to make maximum use of the momentum produced by pedalling under varying ground conditions, load, and acceleration--thus making bicycling easier. The construction has two variable positions which reduce the time during which the pedals are in a dead position (top and bottom) and prolong the time where the pedals are at right angles (16) whereby maximum effect is gained from the power force. This applies if the direction of force is non-circular, i.e. when there is a rise of the ground, and under acceleration as well as "standing pedalling". New positioning is possible in relation to the pedal arm (18), i.e. when changed ground conditions (rise) cause the center of gravity (pedalling) to shift. The invention differs from existing ones in that them is "increased" angular velocity between the driving shaft (1) and driven shaft (2) when they are on the same level and have the same longitudinal direction, which is the easy in this construction. Also, the special suspension obtained by means of three moving rings (3) (4) (5) (like cardan suspension) of which the change of angle and vertical position (4) of the second ring together with the manually controllable parts (16) (18) produce the above-mentioned increased angular velocity and its position in relation to a given center of gravity. (9) shows an exterior bearing.

Dans le cas de bicyclettes, le système selon l'invention permet d'exploiter au maximum l'énergie cinétique produite par le pédalage dans différentes conditions de sol, de charge et d'accélération et de faciliter la pratique du vélo. Le système selon l'invention peut être ajusté de deux manières, premièrement en vue de limiter la période pendant laquelle les pédales sont au point mort (en position haute et basse) et à prolonger la période pendant laquelle elles forment un angle droit (par rapport aux positions haute et basse) (16) qui correspond au point où l'effet de puissance est maximum, et, deuxièmement, en vue de régler ces positions (18) de la manivelle/la pédale lorsque diverses conditions de sol, de pente etc., modifient l'emplacement du point de concentration des forces de pédalage. Le système selon l'invention diffère de ceux déjà existants du fait que l'on utilise la vitesse angulaire variable augmentée entre un arbre menant (1) et un arbre mené (2), lorsque lesdits arbres sont suspendus au même niveau et dans le même sens (comme c'est le cas dans ce système), ainsi qu'une suspension spéciale bilatérale obtenue au moyen de trois anneaux mobiles (3, 4, 5) (comme une suspension à cardan), le changement d'angle ainsi que la position verticale du deuxième anneau (4) conjointement avec les éléments à commande manuelle (16, 18) permettant d'obtenir la vitesse angulaire augmentée susmentionnée et sa position par rapport à un point de concentration de forces donné. L'élément (9) est un roulement extérieur.

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