Bicycle control device

• US 5,241,878 A
• Filed: 08/10/1992
• Issued: 09/07/1993
• Est. Priority Date: 11/29/1988
• Status: Expired due to Term

• Current Assignee: Shimano Inc
• Original Assignee: Shimano Inc
• Inventors: Nagano, Masashi
• Primary Examiner(s): LUONG, VINH
• Application Number:
  US07/925,409
• Time in Patent Office: 393 Days
• Field of Search: 74/489, 74/502.2, 74/475, 192/4 R
• US Class Current: 74/502.2
• CPC Class Codes: B62K 23/06 Levers
• CPC Class Codes: B62L 3/02 for control by a hand lever hand levers for control of cycles in general B62K23/06
• CPC Class Codes: B62M 25/045 having single actuating means operating both front and rear derailleur
• CPC Class Codes: Y10T 74/20037 Occupant propelled vehicle
• CPC Class Codes: Y10T 74/20287 Flexible control element
• CPC Class Codes: Y10T 74/20438 Single rotatable lever [e.g., for bicycle brake or derailleur]

Abstract

A control device attachable to the handlebar of a bicycle for controlling a brake mechanism and change speed mechanism. The control device comprises a bracket fixed to the handlebar and a brake lever pivotable crosswise relative to the bracket. The brake mechanism is controlled by fore and aft pivotal movement of the brake lever, while the change speed mechanism is controlled by sideways pivotal movement of the brake lever.

Claims

1. A control device for mounting on a bicycle handlebar, said control device comprising:

a support member fixed to said handlebar;

a first pivot axis mounted on an upper end region of said support member;

a control lever including;

a base portion pivotably connected to said support member through the first pivot axis,

an intermediate portion extending from said base portion, and

an extreme end portion extending from said intermediate portion,

said base portion including a brake cable attachment portion capable of pulling a brake cable upon pivot movement of said control lever about said first pivot axis,

a second pivot axis extending in a direction substantially perpendicular to said first pivot axis,

said intermediate portion of the control lever being pivotable about the second pivot axis,

a take-up element rotatably mounted on said second pivot axis, said take-up element including a speed change cable attachment portion,

engagement and transmission means mounted between the intermediate portion and the take-up element for transmitting pivot movement in one direction of said intermediate portion of said control lever about said second pivot axis to said take-up element thereby to rotate the take-up element in a first direction, and

auxiliary speed change means for rotating said take-up element in a second direction opposite to said first direction, said auxiliary speed change means including a displaceable speed change control element, whereby movement of said speed change control element causes said take-up element to be rotated in the second direction by a predetermined amount.

2. A control device as claimed in claim 1, wherein said auxiliary speed change means includes a third pivot axis, said speed change control element being pivotable about said third pivoted axis.

3. A control device as claimed in claim 2, wherein said third pivot axis is mounted on said intermediate portion parallel to said second pivot axis.

4. A control device as in claim 1, further comprising a positioning mechanism for holding said take-up element in position, said positioning mechanism defining a plurality of rotative positions of said take-up element corresponding to a plurality of predetermined speed change stages.

5. A control device as in claim 1, further comprising a friction mechanism for holding said take-up element in a speed change position.

6. A control device as in claim 1, wherein said engagement and transmission means operates such that when said intermediate portion of said first control lever is pivoted in a first direction about said second pivot axis from a first home position, said take-up element rotates in said first direction about said second pivot axis and thereafter said intermediate portion of said control lever returns to said first home position without causing rotation of said take-up element.

7. A control device as in claim 2, wherein said auxiliary speed change means operates such that said displaceable speed change control element pivots in a second direction about said third axis from a second home position to cause rotation of said take-up element in said second direction about said second pivot axis and then returns to said second home position without causing rotation of said take-up element.

8. A control device as in claim 1, wherein said intermediate portion and said displaceable speed change control element both pivot in the same direction to cause rotation of said take-up element about said second pivot axis.

9. A control device as in claim 1, wherein said intermediate portion of said control lever is operative to cause said take-up element to rotate about said second pivot axis by an amount corresponding to at least one of a plurality of speed stages with a single pivotal stroke of said intermediate portion of said control lever.

10. A control device as in claim 1, wherein said intermediate portion of said control lever is operative to cause said take-up element to rotate about said second pivot axis by an amount corresponding to a plurality of speed change stages with a single pivotal stroke of said intermediate portion of said control lever.

11. A control device as in claim 1, wherein said auxiliary speed change means causes said take-up element to rotate about said second pivot axis by an amount corresponding to at least one of a plurality of speed change stages with a single pivotal stroke of said displaceable speed change control element.

12. A control device as claimed in claim 1, wherein said auxiliary speed change means include a third pivot axis mounted on the intermediate portion of the control lever parallel to said second pivot axis, said displaceable speed change control element being pivotable about said third pivot axis.

13. A control device as claimed in claim 1, wherein said displaceable speed change control element has a home position with respect to pivotal movement thereof and is urged to the home position by a biassing means, and wherein said displaceable speed change control element is arranged in its home position to be in close proximity to and overlie said intermediate portion of the control lever in plan view substantially over the length thereof.

14. A control device as in claim 1, wherein said displaceable speed change control element causes said take-up element which is first rotated in said first direction to return in said second direction toward a home position under action of a return bias applied to said take-up element.

15. A control device as in claim 1, wherein said auxiliary speed change means causes said take-up element to rotate about said second pivot axis by an amount corresponding to a plurality of speed change stages with a single pivotal movement of said displaceable speed change control element.

16. A control device as claimed in claim 1, wherein said auxiliary speed change means causes said displaceable speed change control element to rotate the take-up element in said second direction after the take-up element has been first rotated in said first direction.

17. A control device for mounting on a handlebar of a bicycle, said control device comprising:

a support member fixed to said handlebar;

a control lever;

pivotal means including a first pivot axis for allowing said control lever to be pivoted in a first plane relative to said support member, and a second pivot axis for allowing said control lever to be pivotable in a second plane different from said first plane relative to said support member from a home position by a predetermined amount;

said control lever including;

a base portion pivotably connected to said support member through the first pivot axis;

an intermediate portion pivotably connected to said base portion through the second pivot axis; and

an extreme end portion extending from said intermediate portion;

pivotal movement of the control lever about the first pivot axis causing said base portion to move;

a take-up element freely rotatable about said second pivot axis;

one-way transmission means mounted between the intermediate portion of the control lever and the take-up element, said transmission means transmitting pivotal movement of the control lever only in one direction about the second pivot axis to said take-up element to rotate said take-up element in a first direction;

return means for returning said control lever, after having been pivoted about the second pivot axis, to said home position;

a brake wire connector connected to said base portion;

a speed change wire connector connected to said take-up element; and

auxiliary speed change means for rotating said take-up element in a second direction opposite to said first direction, said auxiliary speed change means including a displaceable speed change control element, said take-up element being rotated in the second direction by a predetermined amount in response to displacement of said speed change control element.

18. A control device as claimed in claim 17, wherein said auxiliary speed change means includes a third pivot axis, said speed change control element acting as an oscillatable lever pivotable about said third pivot axis.

19. A control device as claimed in claim 18, wherein said third pivot axis is mounted on said intermediate portion parallel to said second pivot axis.

20. A control device as claimed in claim 17, wherein said auxiliary speed change means includes a third pivot axis mounted on the intermediate portion parallel to said second pivot axis, said displaceable speed change control element being pivoted about said third pivot axis, said auxiliary speed change means causing said take-up element to rotate in said second direction upon displacement of said displaceable speed change control element after the take-up element has first been rotated in the first direction.

21. A control device as claimed in claim 20, wherein said displaceable speed change control element has a home position with respect to pivotal movement thereof and is urged to the home position by a biasing means, and wherein said displaceable speed change control element is arranged in its home position to be in close proximity to and overlie said intermediate portion of said control lever substantially over the length thereof.

22. A control device as in claim 17, wherein said displaceable speed change control element causes said take-up element which is first rotated in said first direction to return in said second direction toward a home position under action of a return bias applied to said take-up element.