Bicycle rim brake

Patent metadata

Field	Value
Publication number	US-9586646-B2
Application number	US-201514663469-A
Country	US
Kind code	B2
Filing date	Mar 20, 2015
Priority date	Mar 20, 2015
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

A bicycle rim brake comprises a first brake arm, a second brake arm, and a pivotal cam member. The first brake arm is configured to pivot about a first pivot axis. The first brake arm includes a first mounting portion and a first follower. The second brake arm is configured to pivot about a second pivot axis which is different from the first pivot axis. The second brake arm includes a second mounting portion and a second follower. The pivotal cam member is configured to pivot about a third pivot axis which is different from the first pivot axis and the second pivot axis to guide the first follower and the second follower so that the first brake arm pivots about the first pivot axis and the second brake arm pivots about the second pivot axis.

First claim

What is claimed is:

1. A bicycle rim brake comprising:
a first brake arm configured to pivot about a first pivot axis and including
a first mounting portion to which a first friction member is to be mounted, and
a first follower arranged apart from the first mounting portion;

a second brake arm configured to pivot about a second pivot axis which is different from the first pivot axis and including
a second mounting portion to which a second friction member is to be mounted, and
a second follower arranged apart from the second mounting portion; and

a pivotal cam member configured to pivot about a third pivot axis which is different from the first pivot axis and the second pivot axis to guide both the first follower and the second follower so that the first brake arm pivots about the first pivot axis and the second brake arm pivots about the second pivot axis,
wherein the pivotal cam member includes
a first cam surface configured to guide the first follower, and
a second cam surface configured to guide the second follower, and

wherein the first cam surface is provided on an opposite side of the second cam surface relative to the third pivot axis.

2. The bicycle rim brake according to claim 1 , wherein
the pivotal cam member is provided between the first follower and the second follower.

3. The bicycle rim brake according to claim 1 , wherein
the third pivot axis is provided between the first follower and the second follower.

4. The bicycle rim brake according to claim 1 , wherein
the third pivot axis is provided in an area defined between the first pivot axis and the second pivot axis.

5. The bicycle rim brake according to claim 1 , wherein
the first follower is rotatable about a first rotational axis, and
the second follower is rotatable about a second rotational axis.

6. The bicycle rim brake according to claim 1 , wherein
the first follower is provided on an opposite side of the first mounting portion relative to the first pivot axis, and
the second follower is provided on an opposite side of the second mounting portion relative to the second pivot axis.

7. The bicycle rim brake according to claim 1 , further comprising:
a base member to which the first brake arm is pivotally mounted about the first pivot axis and to which the second brake arm is pivotally mounted about the second pivot axis.

8. The bicycle rim brake according to claim 1 , further comprising:
an intermediate member via which an operating force is to be transmitted to the pivotal cam member.

9. The bicycle rim brake according to claim 8 , wherein
the intermediate member is configured to be coupled to the pivotal cam member to pivot together with the pivotal cam member about the third pivot axis.

10. The bicycle rim brake according to claim 8 , wherein
the intermediate member includes a cable attachment portion to which a control cable is to be attached.

11. The bicycle rim brake according to claim 8 , further comprising:
a hydraulic cylinder including a cylinder bore; and
a piston movably provided in the cylinder bore, wherein
the piston is configured to be coupled to the intermediate member.

12. The bicycle rim brake according to claim 1 , further comprising:
a first coupling member configured to couple the first brake arm to a bicycle frame to pivot relative to the bicycle frame about the first pivot axis; and
a second coupling member configured to couple the second brake arm to the bicycle frame to pivot relative to the bicycle frame about the second pivot axis.

13. The bicycle rim brake according to claim 1 , wherein
the first brake arm includes
a first base part to which the first follower is attached,
a first arm body including the first mounting portion and coupled to the first base part to pivot relative to the first base part about the first pivot axis, and
a first adjuster configured to adjust an orientation of the first arm body relative to the first base part about the first pivot axis.

14. The bicycle rim brake according to claim 13 , wherein
the second brake arm includes
a second base part to which the second follower is attached,
a second arm body including the second mounting portion and coupled to the second base part to pivot relative to the second base part about the second pivot axis, and
a second adjuster configured to adjust an orientation of the second arm body relative to the second base part about the second pivot axis.

15. The bicycle rim brake according to claim 14 , further comprising:
an arm biasing member configured to apply a biasing force to the first arm body and the second arm body so that the first mounting portion and the second mounting portion move away from each other.

16. The bicycle rim brake according to claim 1 , further comprising:
an arm biasing member configured to apply a biasing force to the first brake arm and the second brake arm so that the first mounting portion and the second mounting portion move away from each other.

17. The bicycle rim brake according to claim 1 , wherein
the first brake arm is pivoted from a first rest position to a first operated position and the second brake arm is pivoted from a second rest position to a second operated position by the pivot cam member when the pivot cam member is pivoted about the third pivot axis in a first pivot direction, and
the first brake arm is pivoted from the first operated position to the first rest position and the second brake arm is pivoted from the second operated position to the second rest position by the pivotal cam member when the pivot cam member is pivoted about the third pivot axis in a second pivot direction opposite to the first pivot direction.

18. The bicycle rim brake according to claim 1 , wherein
the pivotal cam member has a single body including
the first cam surface configured to guide the first follower, and
the second cam surface configured to guide the second follower.

19. A bicycle rim brake comprising:
a first brake arm configured to pivot about a first pivot axis and including
a first mounting portion to which a first friction member is to be mounted, and
a first follower arranged apart from the first mounting portion;

a second brake arm configured to pivot about a second pivot axis which is different from the first pivot axis and including
a second mounting portion to which a second friction member is to be mounted, and
a second follower arranged apart from the second mounting portion; and

a pivotal cam member configured to pivot about a third pivot axis which is different from the first pivot axis and the second pivot axis to guide both the first follower and the second follower so that the first brake arm pivots about the first pivot axis and the second brake arm pivots about the second pivot axis,
wherein the pivotal cam member includes
a first cam surface configured to guide the first follower, and
a second cam surface configured to guide the second follower, and

wherein the first cam surface has a profile different from a profile of the second cam surface.

20. A bicycle rim brake comprising:
a first brake arm configured to pivot about a first pivot axis and including a first mounting portion to which a first friction member is to be mounted;
a second brake arm configured to pivot about a second pivot axis which is different from the first pivot axis and including a second mounting portion to which a second friction member is to be mounted; and
a pivotal operating member configured to pivot about a third pi

Assignees

• Shimano Kk

Inventors

• Nakakura Masahiro

Classifications

• B60T1/06 Primary

  acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission {or on double wheels} · CPC title

• F16D2125/60

  Cables or chains, e.g. Bowden cables · CPC title

• B60T11/046

  Using cables (B60T11/043 takes precedence) · CPC title

• B62L1/16

  the axes being located intermediate the ends of the levers · CPC title

• F16D2125/30

  acting on two or more cam followers, e.g. S-cams · CPC title