Automated bicycle transmission
First Claim
1. Automatic transmission for bicycles comprising an actuator for movement into predetermined positions of a moving sprocket change mechanism member for engagement of a motion transmission chain opposite a predetermined sprocket among a plurality of coaxial sprockets of different diameters connected to a wheel, an electronic device sending movement control signals to the actuator and characterized in that to said electronic device is connected a plurality of sensors including a sensor for detection of the speed of the bicycle and a sensor of slope in the longitudinal direction of the bicycle, the electronic device having means of enablement for comparison of values detected by the sensors with ranges of preset values corresponding to the sprocket currently engaged by the chain and sending control signals to the actuator to engage with a different sprocket of the plurality if such detected values are outside said range of values and said different sprocket being associated with ranges of preset values including said detected values.
1 Assignment
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Accused Products
Abstract
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.
53 Citations
12 Claims
- 1. Automatic transmission for bicycles comprising an actuator for movement into predetermined positions of a moving sprocket change mechanism member for engagement of a motion transmission chain opposite a predetermined sprocket among a plurality of coaxial sprockets of different diameters connected to a wheel, an electronic device sending movement control signals to the actuator and characterized in that to said electronic device is connected a plurality of sensors including a sensor for detection of the speed of the bicycle and a sensor of slope in the longitudinal direction of the bicycle, the electronic device having means of enablement for comparison of values detected by the sensors with ranges of preset values corresponding to the sprocket currently engaged by the chain and sending control signals to the actuator to engage with a different sprocket of the plurality if such detected values are outside said range of values and said different sprocket being associated with ranges of preset values including said detected values.
Specification