Chainring

US 9,062,758 B2
Filed: 03/06/2013
Issued: 06/23/2015
Est. Priority Date: 12/06/2011
Status: Active Grant

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First Claim

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1. A solitary chainring of a bicycle front crankset for engaging a bicycle drive chain, comprising:

a chainring body having a radially-oriented center plane, and an inboard side and an outboard side on opposite sides of the center plane;

a plurality of teeth formed about a periphery of the chainring body; and

one or more clearance chamfers formed about the periphery of the chainring body, each of the one or more clearance chamfers disposed between adjacent pairs of the plurality of teeth,each of the adjacent pairs of the plurality of teeth including a first tooth having a first width and second tooth having a second width, the first width greater than the second width,each of the one or more clearance chamfers defining a chainring body width less than the second width of the second tooth.

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Abstract

A solitary chainring of a bicycle front crankset for engaging a bicycle drive chain, including a plurality of teeth formed about a periphery of the chainring. One or more clearance chamfer surfaces are formed on the chainring body, each of the chamfer surfaces substantially centered between adjacent pairs of the plurality of teeth.

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24 Claims

1. A solitary chainring of a bicycle front crankset for engaging a bicycle drive chain, comprising:
- a chainring body having a radially-oriented center plane, and an inboard side and an outboard side on opposite sides of the center plane;
  
  a plurality of teeth formed about a periphery of the chainring body; and
  
  one or more clearance chamfers formed about the periphery of the chainring body, each of the one or more clearance chamfers disposed between adjacent pairs of the plurality of teeth,each of the adjacent pairs of the plurality of teeth including a first tooth having a first width and second tooth having a second width, the first width greater than the second width,each of the one or more clearance chamfers defining a chainring body width less than the second width of the second tooth.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
- - 2. The solitary chainring of claim 1, wherein the one or more clearance chamfers extend from at least one of the inboard and outboard sides of the chainring body in a direction toward the center plane of the chainring.
  - 3. The solitary chainring of claim 2, wherein the one or more clearance chamfers extend at an angle from about 5 degrees to about 45 degrees relative to the center plane of the chainring.
  - 4. The solitary chainring of claim 2, wherein the one or more clearance chamfers extend at an angle at about 25 degrees relative to the center plane of the chainring.
  - 5. The solitary chainring of claim 2, wherein the one or more clearance chamfers are formed on the inboard side of the chainring body.
  - 6. The solitary chainring of claim 2, wherein the one or more clearance chamfers are formed on the outboard side of the chainring body.
  - 7. The solitary chainring of claim 2, wherein at least one of the one or more clearance chamfers are formed on the inboard side and at least one of the one or more clearance chamfers are formed on the outboard side of the chainring body.
  - 8. The solitary chainring of claim 1, wherein each of the one or more clearance chamfers extend circumferentially from one of the adjacent pairs of the plurality of teeth to the other of the adjacent pairs of the plurality of teeth.
  - 9. The solitary chainring of claim 8, wherein each of the one or more clearance chamfers extend circumferentially from a first base of the one of the adjacent pairs of the plurality of teeth to a second base of the other of the adjacent pairs of the plurality of teeth.
  - 10. The solitary chainring of claim 1, wherein the plurality of teeth consists of an even number;
    - wherein the plurality of teeth includes a first group of teeth and a second group of teeth arranged alternatingly between the first group of teeth; and
      
      wherein each tooth of the first group of teeth includes at least a first protrusion on the outboard side thereof and each tooth of the second group of teeth are free of protrusions.
  - 11. The solitary chainring of claim 10, wherein each of the first group of teeth includes a second protrusion on the inboard side thereof.
  - 12. The chainring of claim 11, wherein the first protrusion has a first width and the second protrusion has a second width, wherein the first width is equal to the second width.
  - 13. The chainring of claim 11, wherein the first protrusion has a first width and the second protrusion has a second width, wherein the first width is greater than the second width.
  - 14. The chainring of claim 11, wherein the first group of teeth each have a cross-shaped cross-section adjacent a base thereof.
  - 15. The chainring of claim 10, wherein the second group of teeth each have a rectangular-shaped cross-section adjacent a base thereof.
  - 16. The solitary chainring of claim 10, wherein the one or more clearance chamfers extend from at least one of the inboard and outboard sides of the chainring body in a direction toward the center plane of the chainring.
  - 17. The solitary chainring of claim 16, wherein the one or more clearance chamfers extend at an angle from about 5 degrees to about 45 degrees relative to the center plane of the chainring.
  - 18. The solitary chainring of claim 16, wherein the one or more clearance chamfers extend at an angle at about 25 degrees relative to the center plane of the chainring.
  - 19. The solitary chainring of claim 16, wherein the one or more clearance chamfers are formed on the inboard side of the chainring body.
  - 20. The solitary chainring of claim 16, wherein the one or more clearance chamfers are formed on the outboard side of the chainring body.
  - 21. The solitary chainring of claim 16, wherein at least one of the one or more clearance chamfers are formed on the inboard side and at least one of the one or more clearance chamfers are formed on the outboard side of the chainring body.
  - 22. The solitary chainring of claim 10, wherein each of the one or more clearance chamfers extend circumferentially from one of the adjacent pairs of the plurality of teeth to the other of the adjacent pairs of the plurality of teeth.
  - 23. The solitary chainring of claim 22, wherein each of the one or more clearance chamfers extend circumferentially from a first base of the one of the adjacent pairs of the plurality of teeth to a second base of the other of the adjacent pairs of the plurality of teeth.
  - 24. The chainring of claim 11, wherein each of the second protrusions comprising an undercut formed at the base thereof.

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Current Assignee
SRAM LLC (SRAM International Corp.)
Original Assignee
SRAM LLC (SRAM International Corp.)
Inventors
Reiter, Markus
Primary Examiner(s)
LIU, HENRY Y

Application Number

US13/787,276
Publication Number

US 20130184110A1
Time in Patent Office

839 Days
Field of Search

474/156
US Class Current

1/1
CPC Class Codes

B62M 2009/007   Guides to prevent chain fro...

B62M 9/02   of unchangeable ratio

F16H 55/30   Chain-wheels

F16H 55/303   for round linked chains, i....

Chainring

First Claim

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Abstract

47 Citations

24 Claims

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Chainring

First Claim

1 Assignment

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Abstract

47 Citations

24 Claims

Specification

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Solutions

Use Cases

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