摘要:
The flapping-preventing runner (10) constituting the subject-matter of the present invention is constituted by two half-runners (11) and (12), each comprising a couple of divergent guides (14) designed for supporting and guiding the two branches of a transmission chain (21). The two half-runners (11) and (12) are housed inside the dead space existing between the sprocket wheels (19) and (20) and the transmission chain (21) which connects them. In an alternative form of practical embodiment of the invention, the guides (14) are provided with flanges (28) which totally enclose the two transmission chain branches (21).
摘要:
A bicycle wheel brake (10) consisting of a pair of opposed friction blocks (18) carried by respective levers (16) pivoted, either directly or through a support (11), to the bicycle frame, so as to be controllable against the action of antagonists (17) to lock the blocks against the wheel rim (13). Each lever is pivoted at one side of the wheel so as to move on a plane substantially parallel to the plane tangential to the wheel.
摘要:
A transmission gear unit (10) for the timing system control in internal combustion engines comprises two gears (11, 12) interconnected with each other by at least one gearing chain (13). A removable insert (14) is interposed between the gears (11, 12), which insert (14) has on one side thereof, one element (19) for fitting between at least two teeth of the first gear (11) and on its opposite side, at least two elements (16, 17) each fitting between two teeth of the second gear (12). In this way the insert (14) keeps the chain (13) stretched over the gears and prevents the gears from mutually rotating. The insert (14) is provided with a grip handle (18) for removing it by a movement normal to the plane of the gears thereby releasing the rotation of said gears after they have been set in place.
摘要:
A drive chains for cycles comprises an alternation of reciprocally pivoted outer links (11) and inner plates (15), wherein the said pivoting system comprises a pin (13) fixed to the plates of the outer link onto which the inner plates are directly articulated, there being also a roller (16) rotating on the said pin, which is intended to be engaged by a chain wheel.
摘要:
An automated bicycle transmission (10) comprises an actuator (17) for movement into predetermined positions of a sprocket change mechanism member (18) moving to engage a chain (19) for transmission of motion opposite a predetermined sprocket among a plurality of coaxial sprockets of different diameter (20). The actuator is controlled by an electronic control device (11) to which is connected a plurality of sensors including a sensor (1) for detection of bicycle speed, a sensor (13) for longitudinal slope or inclination of the bicycle and optionally a sensor (15) of stress transmitted by the cyclist to the pedals. The electronic device (11) compares values detected by the sensors with ranges of preset values corresponding to the various sprockets and controls engagement of the chain with the sprocket having a range of values including said detected values. There can also be provided a sensor (14) of movement of the pedals enabling operation of the actuator (17) only if the cyclist is pedalling.
摘要:
An electromechanical bicycle transmission (10) comprises an electric motor (16) controlling through a first rigid mechanism (29) the movement of a first element (28) connected through preloaded yielding means (24,25) to a second movement element (21) through another rigid mechanism (18,19,20) of a sprocket change mechanism member (11) moving to engage a transmission chain (12) opposite a predetermined sprocket of a plurality of coaxial sprockets (13) of different diameters.