Abstract:
A bicycle transmission system is provided herein. The bicycle transmission system includes a sprocket or ring that is capable of sliding amongst an infinite number of lateral positions relative to a crank arm. The movement of the sprocket or ring facilitates an optimal chain path from the sprocket or ring to another sprocket or ring in the transmission system and, therefore, increases the efficiency with which power is transferred through the system.
Abstract:
L'invention concerne un procédé et dispositif de pédalage notamment adaptés à une position debout d'un utilisateur. Dans un mode de réalisation, le dispositif comprend un arbre moteur (2) dont la rotation autour de son axe est couplée à la rotation de deux pédales droite (10) et gauche (60) . Les pédales sont couplées entre elles par un ensemble de manivelles (3, 53, 11, 61) , de bielles (7, 57) , et de pivots (6, 8, 14, 56, 58, 64) de sorte que: - les pédales sont libres d'avoir une trajectoire circulaire, - pour une vitesse de rotation constante de l'arbre, les vitesses des pédales sont périodiques de même période mais déphasées, minimales au point mort bas, maximales au point mort haut, et - lorsque les pédales sont simultanément à une même hauteur inférieure à celle du centre de la trajectoire, les vitesses des pédales sont égales. L'oscillation verticale du centre de gravité d'un utilisateur en position debout est réduite par rapport à un pédalier classique.
Abstract:
Es wird ein Tretkurbelantrieb für ein Fahrrad mit zwei über eine Tretkurbelwelle (1) drehfest miteinander verbundenen Tretkurbeln(2), it einem auf einem Lageransatz (5) einer der beiden Tretkurbeln (2) anschlagbegrenzt drehbar gelagerten Kettenrad (3) und mit wenigstens einer in Umfangsrichtung verlaufenden Druckfeder (12) uwischen dieser Tretkurbel (2) und dem ein Widerlager (14) für die Druckfeder (12) tragenden Kettenrad (3) beschrieben. Um vorteilhafte Konstruktionsbedingungen zu schaffen, wird vorgeschlagen, daβ die das Kettenrad (3) tragende Tretkurbel (2) mit einem gegen das Kettenrad (3) vorstehenden Ansatz (16) in eine Ausnehmung (17) des Kettenrades (3) eingreift, die in beiden Umfangsrichtungen Drehanschläge (18, 19) für diese Tretkurbel (2) bildet.
Abstract:
The system eliminates the dead spot and enables the user to conserve energy during each stroke due to an increase in stroke power and efficiency. It is comprised of a pair of crank arms (112L, 112R) having an obtuse configuration. Each crank includes a spindle opening (112LB, 112RB) located at the middle part of the crank connected to a spindle (14), a brace opening located at one distal end, and a pedal opening located at the end opposite the brace opening for receiving a pedal (20L, 20R). A chainring brace (16) is mounted on the spindle (14) and includes a post (16A) mounted within the right crank brace opening. A brace (18) is also mounted on the spindle (14) and includes a post (18A) mounted within the left crank brace opening.
Abstract:
Two or three-wheeled vehicle which comprises a frame (3), a drive system connected to the frame and provided with a motor or a pedal system, and a handlebar (4) mounted pivotally in the frame for at least one wheel provided with a hub (6), wherein the hub is connected to the handlebar via a steering arm (7) extending along the steering wheel, wherein a drive shaft extending at least into the hub of the steering wheel is connected rotatably to a part of the frame extending roughly parallel to the steering arm, and a universal coupling part (12) is arranged between the drive shaft and the hub of the wheel, wherein the drive shaft is connected drivably to the drive system in order to obtain a compact vehicle.
Abstract:
A pedal assembly has typical pedals (71), attached in driving relation to a noncircular drive sprocket (72). The noncircular drive sprocket (72) is connected to a non-circular driven sprocket (73), via a chain (75), entrained about the two sprockets. A bicycle frame (76) establishes the center-to-center distance. The pitch curve of the drive sprocket (72) is twice as long as that of the driven sprocket (73). The spacing, shape and size of the sprockets maintaining the endless member substantially taut for each rotational position of the rotational members about which the flexible member is entrained. A method of making a noncircular drive is also disclosed.
Abstract:
A drive mechanism (20) including a first shaft (324) having a first fixed gear (328) and a second shaft (322) having a second fixed gear (330) that engages the first fixed gear to cause the first shaft to rotate in an opposite direction than the second shaft. A first linkage (368) connecting the first shaft and the third shaft and includes a first one-way gear (336). A second linkage (366) connecting the second shaft and the third shaft and includes a second one-way gear (338). The third shaft outputs a unidirectional rotational motion.
Abstract:
The present invention relates to a mechanical element, and more particularly, to a crank connected to a bicycle pedal or a handle for rotating a rotary body and to a bicycle using the same. The present invention uses a cylindrical cam, an end cam, or a swash plate cam, and the shafts of these cams and a shaft of a pedal or a handle for applying force are equipped with a miter gear (a bevel gear the number of teeth of which is 1:1 and the shaft angle of which is 90 degrees), such that the crank retracts/extends one time per one rotation of the pedal or the handle. The retractable/extendable crank of the present invention is advantageous in that the length of the crank is elongated to generate a large amount of rotating force in a force-applying section, and shortened in a section where no force is applied to reduce the actuating space occupied by the crank and apply a large amount of torque to the rotary body from the same force, without deviating from the normal motion range of the arms or legs during rotation. The retractable/extendable crank of the present invention has a significantly rigid structure and provides reliable operation, and thus is suitable as a driving crank to be connected to a pedal of a bicycle. As compared with conventional bicycles, the bicycle using the crank of the present invention is supplied with a larger amount of rotating force in proportion to the elongation of the crank from the same force, thus enabling the bicycle of the present invention to travel quickly with less force and climb a steep upward slope in an easy manner.
Abstract:
본 발명은 기계요소에 관한 것으로서, 좀더 구체적으로는 자전거의 페달 또는 회전체를 회전시키는 손잡이에 연결되는 크랭크 및 이를 이용한 자전거에 관한 것이다. 본 발명은 원통캠, 단면캠, 또는 경사판캠을 이용하고, 이들 캠의 축과 힘을 가하는 페달 또는 손잡이의 축에 마이터기어(Miter Gear, 잇수가 1:1이며, 축각이 90°인 베벨기어)를 구비하여, 페달 또는 손잡이가 1회전 할 때마다 크랭크가 1회씩 신축하도록 하였다. 본 발명의 신축가능한 크랭크는 힘을 가하는 구간에서는 크랭크의 길이가 길어져서 큰 회전력을 얻을 수 있으며, 또한 힘을 가하지 않는 구간에서는 크랭크의 길이가 짧아져서 작동공간을 크게 차지하지 않고, 또한 회전중에 팔 또는 다리의 정상 운동범위를 벗어나지 않으면서도 동일한 힘으로 회전체에 큰 토크를 가할 수 있다. 본 발명의 신축가능한 크랭크는 구조가 아주 단단하고 작동이 확실하여, 자전거의 페달에 연결되는 구동크랭크로 사용하기에 적합하다. 이를 적용한 자전거는 통상의 자전거에 비하여 동일한 힘으로 크랭크가 신장되는 길이만큼 큰 회전력을 줄 수 있으므로 힘을 덜 들이고 빠르게 주행할 수 있으며, 좀더 급한 경사의 언덕을 쉽게 올라갈 수 있는 특징이 있다.
Abstract:
A two piece bicycle crank set having two monolithic, thin wall continuous tubular members. The tubular members are coupled midway between two bearing sets within a bracket shell of a bicycle. The coupling connecting the tubular members can include an outer sleeve, an inner sleeve, two exteriorly tapered and internally threaded bushings and a threaded stud. Alternatively, an interference fit coupling connects the tubular members and includes a mortise member and a tenon member.