Control system for adjusting bicycle gear ratios
First Claim
1. In combination,a bicycle having front and rear wheels and a sprocket and a pedal crank for driving the sprocket and a gear chain in engagement with the sprocket and a plurality of gears on the rear wheel, the chain being adjustable in position relative to the gears on the rear wheel to provide an engagement between individual ones of the gears and the gear chain,means operative in an automatic mode and operatively coupled only to the sprocket and the frame for determining the speed of the sprocket at each instance, andmeans operative in the automatic mode and responsive at each instance only to the determination of the sprocket speed for adjusting the position of the gear chain relative to the gears on the rear wheel to maintain the speed of the sprocket within particular limits.
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Accused Products
Abstract
A bicycle has front and rear wheels, a sprocket coupled to a pedal crank, a sprocket gear, gears on the rear wheel and a gear chain extending around the sprocket gear and an individual one of the rear wheel gears. The chain is adjustably coupled to the individual gears on the rear wheel to respectively increase and decrease the gear ratio relative to the sprocket gear for sprocket speeds above the upper limit and below the lower limit. The upper limit is adjustable as by initially operating up and down switches together within a particular time limit and then operating the up switch for upper limit increments or the down switch for upper limit decrements. The sequence may then be repeated for lower limit adjustments. The movement of a particular number of sprocket ribs past a detector and the time for such movement are measured and processed to determine the sprocket speed. When the sprocket is rotating continuously at a speed below the lower limit, as when coasting downhill, the gear ratio is not changed. The system power is discontinued for no sprocket movement for a continuous time greater than the limited time.
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Citations
58 Claims
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1. In combination,
a bicycle having front and rear wheels and a sprocket and a pedal crank for driving the sprocket and a gear chain in engagement with the sprocket and a plurality of gears on the rear wheel, the chain being adjustable in position relative to the gears on the rear wheel to provide an engagement between individual ones of the gears and the gear chain, means operative in an automatic mode and operatively coupled only to the sprocket and the frame for determining the speed of the sprocket at each instance, and means operative in the automatic mode and responsive at each instance only to the determination of the sprocket speed for adjusting the position of the gear chain relative to the gears on the rear wheel to maintain the speed of the sprocket within particular limits.
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4. In combination,
a bicycle having front and rear wheels and a sprocket and a pedal crank for driving the sprocket and a gear chain in engagement with the sprocket and a plurality of gears on the rear wheel, the chain being adjustable in position relative to the gears on the rear wheel to provide an engagement between individual ones of the gears and the gear chain, means operative in an automatic mode and operatively coupled to the sprocket for determining the speed of the sprocket at each instance, and means operative in the automatic mode and responsive at each instance to the determination of the sprocket speed for adjusting the position of the gear chain relative to the gears on the rear wheel to maintain the speed of the sprocket within particular limits, means operative in the automatic mode for adjusting the position of the gear chain relative to the gears on the rear wheel to obtain the coupling of a higher gear to the gear chain when the speed of the sprocket is determined to be above a first particular value, means operative in the automatic mode for adjusting the position of the gear chain relative to the gears on the rear wheel to obtain the coupling of a lower gear to the gear chain when the speed of the sprocket is determined to be below a particular value, means operative in the automatic mode for adjusting the first particular value to a first new value, and means operative in the automatic mode for adjusting the second particular value to a second new value.
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5. In combination,
a bicycle having front and rear wheels and a pedal crank and a sprocket coupled to the pedal crank and a gear on the sprocket and a plurality of gears on the rear wheel and a chain for coupling individual ones of the gears on the rear wheel to the gear on the sprocket, means operative in the automatic mode and operatively coupled to the sprocket for determining the speed of the sprocket at each instance, means operative in the automatic mode and responsive to the speed of the sprocket at each instance for adjusting the position of the gear chain relative to the gears on the rear wheel to select individual ones of the gears on the rear wheel for coupling to the gear chain to maintain the speed of the sprocket within particular limits, and means operative in the automatic mode and responsive to the speed of the sprocket below a particular value lower than the particular limits for maintaining the coupling between the gear on the sprocket and the selected one of the gears on the rear wheel without any adjustment.
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9. In combination,
a bicycle having front and rear wheels and having a pedal crank and a sprocket coupled to the pedal crank and having gears coupled to the rear wheel and having a gear coupled to the sprocket and having a gear chain extending around the gear on the sprocket and individual ones of the gears on the rear wheel, means operative in an automatic mode and operatively coupled to the sprocket for determining the speed of rotation of the sprocket at each instance, means operative in the automatic mode for adjusting the gear chain relative to the gears on the rear wheel in accordance with the determination of the speed of rotation of the sprocket to adjust the ratio of the gear chain coupled to the gear on the rear wheel relative to the gear on the sprocket, and means operative in the automatic mode for adjusting the angle though which the sprocket rotates to obtain each determination of the speed of rotation of the sprocket.
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13. In combination,
a bicycle having front and rear wheels and having a pedal crank and a sprocket coupled to the pedal crank and having gears coupled to the rear wheel and having a gear coupled to the pedal crank and having a gear chain extending around the gear on the pedal crank and individual ones of the gears on the rear wheel, first means operative in an automatic mode and operatively coupled to the sprocket for determining the speed of the sprocket at each instance, second means operative in the automatic mode for adjusting the coupling of the gear chain relative to the individual gears on the rear wheel in accordance with the determination of the sprocket speed, third means operative in the automatic mode for disabling the gear adjusting means for sprocket speeds of rotation below a first particular value to maintain, while coasting, the gear ratios set before the beginning of the coating, fourth means operative in the automatic mode for enabling the operation of the first, second and third means, and means operative in the automatic mode for discontinuing the enabling by the fourth means of the operation of the first, second and third means upon the occurrence of a zero sprocket speed for a time greater than a particular period of time.
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17. In combination,
a bicycle having front and rear wheels and having a sprocket and a pedal crank operatively coupled to the sprocket for driving the sprocket and having a gear on the sprocket and having a plurality of gears on the rear wheel and having a gear chain operatively coupled to the gear on the sprocket and individual ones of the gears on the rear wheel, the gear chain being adjustable relative to the gears on the rear wheel to provide for the coupling of the gear chain to the individual ones of the gears on the rear wheel, first means operative in an automatic mode for providing for an adjustment of the gear chain relative to the gears on the rear wheel upon a rotary speed of the sprocket above a first particular value to increase the ratio between the individual one of the gears on the rear wheel relative to the gear on the sprocket and to decrease the sprocket speed, and second means operative in the automatic mode for adjusting the first particular value while the first means is operative to provide the adjustment of the gear chain relative to the gears on the rear wheel.
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21. In combination,
a bicycle having front and rear wheels, a pedal crank, a sprocket coupled to the pedal crank, a gear coupled to the sprocket, a plurality of gears coupled to the rear wheel and a gear chain extending in a closed loop around the sprocket gear and an individual one of the gears on the rear wheel, first means operative in an automatic mode and operatively coupled to the sprocket for determining the rotary speed of the sprocket at each instance, second means operative in the automatic mode for adjusting the gear chain relative to the gears on the rear wheel in accordance with the rotary speed of the sprocket to maintain the sprocket speed within particular limits, and third means operative in the automatic mode for overriding the adjustment by the second means of the gear chain relative to the gears on the rear wheel in the automatic mode in accordance with the sprocket speed to obtain a manual adjustment of the gear chain relative to the gears on the rear wheel.
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26. In combination,
a bicycle having front and rear wheels, a pedal crank, a sprocket coupled to the pedal crank, a gear coupled to the sprocket, a plurality of gears coupled to the rear wheel and a gear chain extending in a closed loop around the sprocket gear and an individual one of the gears on the rear wheel and adjustable relative to the gears on the rear wheel, first means operative in an automatic mode and operatively coupled to the sprocket for determining the sprocket speed at each instance, second means operative in the automatic mode for adjusting the gear chain relative to the gears on the rear wheel in accordance with the sprocket speed to maintain the sprocket speed between upper and lower limits, first and second switches for respectively adjusting the upper and lower limits, third means responsive in the automatic mode to a first sequence of operation of the first and second switches within a particular time limit for adjusting the upper limit, and fourth means responsive in the automatic mode to a second sequence of operation of the first and second switches within the particular time limit for adjusting the lower limit.
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30. In combination,
a bicycle having front and rear wheels, a pedal crank, a sprocket coupled to the pedal crank, a gear coupled to the sprocket, a plurality of gears coupled to the rear wheel and a gear chain extending in a closed loop around the sprocket gear and an individual one of the gears on the rear wheel and adjustable relative to the gears on the rear wheel, first means operative in an automatic mode for adjusting the position of the sprocket chain relative to the gears on the rear wheel when the sprocket speed is above an upper limit or below a lower limit, first and second actuatable switches, second means operative in the automatic mode for providing for an adjustment in the upper limit upon an actuation of the first and second switches in a first particular sequence within a first particular time limit and for providing for an adjustment in the lower limit upon an actuation of the first and second switches in a second particular sequence within the particular time limit, third means operative in the automatic mode and responsive to the actuation of the first and second switches in the first particular sequence within the first particular time limit for adjusting the upper limit, and fourth means operative in the automatic mode and responsive to the actuation of the first and second switches in the second particular sequence for adjusting the lower limit.
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35. In combination,
a bicycle having a frame, a front wheel, a rear wheel mounted on the frame, a pedal crank, a sprocket coupled to the pedal crank, a plurality of gears coupled to the rear wheel and a gear chain extending around the gear on the sprocket and an individual one of the gears on the rear wheel and adjustably positioned relative to the gears on the rear wheel, first means operative in an automatic mode and operatively coupled to the gear chain for adjusting the position of the gear chain relative to the gears on the rear wheel, second means operative in the automatic mode and operatively coupled only to the sprocket and the frame for determining the speed of the sprocket, and processing means responsive to the determination by the second means of the speed of the sprocket for operating the first means to adjust the position of the gear chain relative to the gears on the rear wheel for maintaining the speed of sprocket rotation within particular limits.
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36. In combination,
a bicycle having a frame, a front wheel and a rear wheel mounted on the frame, a sprocket coupled to the pedal crank, a plurality of gears coupled to the rear wheel and a gear chain extending around the gear on the sprocket and an individual one of the gears on the rear wheel, first means operatively coupled to the gear chain for adjusting the position of the gear chain relative to the gears on the rear wheel, second means operatively coupled to the sprocket for determining the speed of the sprocket, and processing means responsive to the speed of the sprocket for operating the first means to adjust the position of the gear chain relative to the gears on the rear wheel for maintaining the speed of sprocket rotation within particular limits third means manually operative to obtain an adjustment of the gear chain relative to the gears on the rear wheel, the third means being operatively coupled to the first means to provide for a manual operation of the first means in adjusting the position of the gear chain relative to the gears on the rear wheel in accordance with the manual operation of the third means, the processing means being responsive to the manual operation of the third means for discontinuing the operation of the processing means.
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37. In combination,
a bicycle having a frame, a front wheel and a rear wheel mounted on the frame, a sprocket coupled to the pedal crank, a plurality of gears coupled to the rear wheel and a gear chain extending around the gear on the sprocket and an individual one of the gears on the rear wheel, first means operatively coupled to the gear chain for adjusting the position of the gear chain relative to the gears on the rear wheel, second means operatively coupled to the sprocket and the frame for determining the speed of the sprocket, and processing means responsive to the speed of the sprocket for operating the first means to adjust the position of the gear chain relative to the gears on the rear wheel for maintaining the speed of sprocket rotation within particular limits, the third means being manually operative in a first mode to obtain an adjustment by the first means of the gear chain relative to the gears on the rear wheel, the third means being manually operative in a second mode to obtain an adjustment by the processing means of the particular limits of the sprocket speeds at which the gear chain is adjusted relative to the gears on the rear wheel.
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38. In combination,
a bicycle having front and rear wheels and a sprocket and a pedal crank for driving the sprocket and a gear chain in engagement with the sprocket and a plurality of gears on the rear wheel, the gear chain being adjustable in position relative to the gears on the rear wheel to provide an engagement between individual ones of the gears and the gear chain, first means operative in an automatic mode and operatively coupled to the sprocket for determining the speed of the sprocket at each instance, second means operative in the automatic mode and responsive at each instance to the determination of the sprocket speed for adjusting the position of the gear chain relative to the gears on the rear wheel to maintain the speed of the sprocket within upper and lower limits, third means including switching means operative in a first relationship in the automatic mode for adjusting the upper and lower limits, and fourth means including the switching means operative in a second relationship for converting the adjustment of the position of the gear chain relative to the gears on the rear wheel to a manual mode, and fifth means responsive to the operation of the fourth means including the switching means in the second relationship for adjusting the position of the gear chain relative to the gears on the rear wheel in accordance with such operation of the switching means.
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42. In combination,
a bicycle having front and rear wheels and a sprocket and a pedal crank for driving the sprocket and a gear chain in engagement with the sprocket and a plurality of gears on the rear wheel, the gear chain being adjustable in position relative to the gears on the rear wheel to provide an engagement between individual ones of the gears and the gear chain, signal producing means disposed on one of the sprocket and the frame, a sensor disposed on the other one of the sprocket and the frame and responsive only to the signal producing means to produce signals in accordance with the rotation of the sprocket relative to the frame, and first means operative in an automatic mode and responsive only to the signals from the sensor for adjusting the position of the gear chain relative to the gears on the rear wheel to maintain the speed of rotation of the sprocket within particular limits.
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44. In combination,
a bicycle having front and rear wheels and a sprocket and a pedal crank for driving the sprocket and a gear chain in engagement with the sprocket and a plurality of gears on the rear wheel, the gear chain being adjustable in position relative to the gears on the rear wheel to provide an engagement between individual ones of the gears and the gear chain, a sensor disposed on an individual one of the sprocket and the frame, signal producing means disposed on the other one of the sprocket and the frame to energize the sensor in accordance with the rotation of the sprocket relative to the frame, and first means operative in an automatic mode and responsive only to the signals from the sensor for adjusting the position of the gear chain relative to the gears on the rear wheel to maintain the speed of rotation of the sprocket within particular limits, second means operative in the automatic mode for preventing any adjustment in the gear chain relative to the gears on the rear wheel when the sprocket is at a speed lower than a particular speed, the particular speed being lower than the lower one of the particular limits, and third means responsive to the non-rotation of the sprocket for a particular period of time for discontinuing the operation of the bicycle in the automatic mode.
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45. In combination,
a bicycle having front and rear wheels and a sprocket and a pedal crank for driving the sprocket and a gear chain in engagement with the sprocket and a plurality of gears on the rear wheel, the gear chain being adjustable in position relative to the gears on the rear wheel to provide an engagement between individual ones of the gears and the gear chain, a sensor disposed on an individual one of the sprocket and the frame, signal producing means disposed on the other one of the sprocket and the frame to energize the sensor in accordance with the rotation of the sprocket relative to the frame, and first means operative in an automatic mode and responsive only to the signals from the sensor for adjusting the position of the gear chain relative to the gears on the rear wheel to maintain the speed of rotation of the sprocket within particular limits, and second means for discontinuing the operation of the first means and for converting the operation of the bicycle to a manual mode where the position of the gear chain relative to the gears on the rear wheel is adjusted manually.
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46. In combination,
a bicycle having front and rear wheels and a sprocket and a pedal crank for driving the sprocket and a gear chain in engagement with the sprocket and a plurality of gears on the rear wheel, the gear chain being adjustable in position relative to the gears on the rear wheel to provide an engagement between individual ones of the gears and the gear chain, a sensor disposed on an individual one of the sprocket and the frame, signal producing means disposed on the other one of the sprocket and the frame to energize the sensor in accordance with the rotation of the sprocket relative to the frame, means operative in an automatic mode and responsive only to the signals from the sensor for adjusting the position of the gear chain relative to the gears on the rear wheel to maintain the speed of rotation of the sprocket within particular limits, and second means operative in the automatic mode for adjusting the upper and lower limits in which the sprocket rotates without providing for an adjustment in the position of the gear chain relative to the gears on the rear wheel.
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47. In combination,
a bicycle having front and rear wheels and a sprocket and a pedal crank for driving the sprocket and a gear chain in engagement with the sprocket and a plurality of gears on the rear wheel, the gear chain being adjustable in position relative to the gears on the rear wheel to provide an engagement between individual ones of the gears and the gear chain, first means disposed on one of the sprocket and the frame to provide a signal, sensor means disposed on the other one of the sprocket and the frame and responsive to the signal from the first means during the rotation of the sprocket relative to the frame for producing signals in accordance with the rotation of the sprocket relative to the frame, means operative in an automatic mode and responsive to the signals from the sensor means for adjusting the position of the gear chain relative to the gears on the rear wheel to maintain the speed of rotation of the sprocket within upper and lower limits, and means operative in the automatic mode for adjusting the upper and lower limits of the sprocket speed of rotation.
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51. In combination,
a bicycle having front and rear wheels and a sprocket and a gear chain in engagement with the sprocket and a plurality of gears on the rear wheel, the gear chain being adjustable in position relative to the gears on the rear wheel to provide an engagement between individual ones of the gears and the gear chain, first means disposed on one of the sprocket and the frame to provide a signal, sensor means disposed on the other one of the sprocket and the frame and responsive to the signal from the first means during the rotation of the sprocket relative to the frame for producing signals in accordance with the rotation of the sprocket relative to the frame, means operative in an automatic mode and responsive to the signals from the sensor means for adjusting the position of the gear chain relative to the gears on the rear wheel to maintain the speed of rotation of the sprocket within upper and lower limits, means including switching means operative in the automatic mode in a first relationship for adjusting the upper and lower limits, and means including the switching means operative in the automatic mode in a second relationship different from the first relationship for converting to a manual operation the adjustment in the gear chain relative to the gears on the rear wheel and for adjusting the gear chain relative to the gears on the rear wheel in accordance with the operation of the switching means in the second relationship.
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55. In combination,
a bicycle having front and rear wheels and having a sprocket and a pedal crank operatively coupled to the sprocket for driving the sprocket and having a gear on the sprocket and having a plurality of gears on the rear wheel and having a gear chain operatively coupled to the gear on the sprocket and individual ones of the gears on the rear wheel, the gear chain being adjustable relative to the gears on the rear wheel to provide for the coupling of the gear chain to the individual ones of the gears on the rear wheel, first means operative in an automatic mode for providing for an adjustment of the gear chain relative to the gears on the rear wheel upon a rotary speed of the sprocket below a first particular value to decrease the ratio between the individual one of the gears on the rear wheel relative to the gear on the sprocket and to increase the sprocket speed, and second means operative in the automatic mode for adjusting the first particular value, during the operation of the first means in the automatic mode, in providing the adjustment of the gear chain relative to the gears on the rear wheel.
Specification