Method and apparatus for shifting a bicycle transmission

• US 8,360,909 B2
• Filed: 01/08/2008
• Issued: 01/29/2013
• Est. Priority Date: 11/23/2001
• Status: Active Grant

• Current Assignee: Shimano Inc
• Original Assignee: Shimano Inc
• Inventors: Ichida, Tadashi
• Primary Examiner(s): Dondero, William E
• Assistant Examiner(s): Reese, Robert T
• Application Number:
  US11/970,753
• Publication Number:
  US 20080108465A1
• Time in Patent Office: 1,848 Days
• Field of Search: 474/69, 474/70
• US Class Current: 474/70
• CPC Class Codes: B62M 25/045 having single actuating means operating both front and rear derailleur
• CPC Class Codes: B62M 25/08 with electrical or fluid transmitting systems

Abstract

A control mechanism for controlling a bicycle transmission to set a speed stage of a bicycle comprises a shift command communication path for communicating electronic shift commands to select a speed stage of the bicycle, a transmission command communication path for communicating information for controlling the operation of the bicycle transmission, and a transmission control unit operatively coupled to the shift command communication path and to the transmission command communication path for receiving the shift commands and for generating the information for controlling the operation of the bicycle transmission. When the transmission control unit receives at least one shift command requesting a shift through N speed stages to a destination speed stage, where N is an integer greater than one, the transmission control unit generates information for causing the bicycle transmission to move to the destination speed stage.

Claims

1. An apparatus for controlling a bicycle transmission to set a speed stage of a bicycle, comprising:

a shift command communication path for communicating electronic shift commands to select a speed stage of the bicycle;

a transmission command communication path for communicating information for controlling the operation of the bicycle transmission;

a transmission control unit operatively coupled to the shift command communication path and to the transmission command communication path for receiving the shift commands from the shift command communication path and for generating the information for controlling the operation of the bicycle transmission and outputting the information for controlling the operation of the bicycle transmission on the transmission command communication path;

wherein, when the transmission control unit receives at least one shift command requesting a shift through N speed stages to a destination speed stage, where N is an integer greater than one, the transmission control unit generates information for causing the bicycle transmission to move to the destination speed stage and outputs the information for causing the bicycle transmission to move to the destination speed stage on the transmission command communication path; and

wherein the shift command requesting a shift through N speed stages comprises a first command signal and a second command signal, wherein the first command signal and the second command signal occur simultaneously.

2. The apparatus according to claim 1 wherein the first command signal occurs prior to the second command signal.

3. The apparatus according to claim 1 further comprising a manually-operated shift control unit operatively coupled to the shift command communication path for providing the shift commands to the shift command communication path.

4. The apparatus according to claim 3 further comprising:

a speed sensor operatively coupled to a speed communication path; and

an automatic shift control unit operatively coupled to the speed communication path and to the shift command communication path for automatically generating shift commands to the shift command communication path based on information received from the speed sensor.

5. The apparatus according to claim 3 further comprising:

a cadence sensor operatively coupled to a cadence communication path; and

an automatic shift control unit operatively coupled to the cadence communication path and to the shift command communication path for automatically generating shift commands to the shift command communication path based on information received from the cadence sensor.

6. The apparatus according to claim 1 wherein the bicycle transmission comprises a first transmission and a second transmission, and wherein the transmission control unit generates information for causing at least one of the first transmission or the second transmission to move so that the first transmission and the second transmission are in a combined position to produce the destination speed stage.

7. The apparatus according to claim 1 wherein the first command signal occurs for a time interval greater than a first predetermined time interval.

8. The apparatus according to claim 7 wherein the second command signal occurs for a time interval greater than a second predetermined time interval.

9. The apparatus according to claim 8 wherein the first predetermined time interval is equal to the second predetermined time interval.

10. The apparatus according to claim 1 wherein the first command signal occurs for a first time interval, wherein the second command signal occurs for a second time interval, and wherein the second time interval is less than the first time interval.

11. The apparatus according to claim 10 wherein the first command signal occurs prior to the second command signal.

12. The apparatus according to claim 11 wherein the second command signal terminates prior to the first command signal.

13. The apparatus according to claim 12 wherein the first command signal and the second command signal both occur for a time interval greater than a predetermined time interval.

14. The apparatus according to claim 1 wherein the first and second command signals that occur simultaneously are recognized by the transmission control unit as a component of a shift command, wherein that component commands the shift through the N speed stages.

15. A method for controlling a bicycle transmission to set a speed stage of a bicycle, comprising the steps of:

receiving, by a transmission control unit, at least one electronic shift command requesting a shift through N speed stages to a requested destination speed stage, wherein N is an integer greater than one;

wherein the shift command requesting a shift through N speed stages comprises a first command signal and a second command signal, wherein the first command signal and the second command signal occur simultaneously; and

generating, by the transmission control unit, information for causing the bicycle transmission to move to the destination speed stage.

16. The method according to claim 15 wherein the first command signal occurs prior to the second command signal.

17. The method according to claim 15 wherein the bicycle transmission comprises a first transmission and a second transmission, and wherein the transmission control unit generates information for causing at least one of the first transmission or the second transmission to move so that the first transmission and the second transmission are in a combined position to produce the destination speed stage.

18. The apparatus according to claim 15 wherein the first command signal occurs for a time interval greater than a first predetermined time interval.

19. The method according to claim 18 wherein the second command signal occurs for a time interval greater than a second predetermined time interval.

20. The method according to claim 19 wherein the first predetermined time interval is equal to the second predetermined time interval.

21. The method according to claim 15 wherein the first command signal occurs for a first time interval, wherein the second command signal occurs for a second time interval, and wherein the second time interval is less than the first time interval.

22. The method according to claim 21 wherein the first command signal occurs prior to the second command signal.

23. The method according to claim 22 wherein the second command signal terminates prior to the first command signal.

24. The method according to claim 23 wherein the first command signal and the second command signal both occur for a time interval greater than a predetermined time interval.