Bicycle front fork assembly

• US 6,669,218 B1
• Filed: 07/12/2002
• Issued: 12/30/2003
• Est. Priority Date: 07/12/2002
• Status: Expired due to Term

• Current Assignee: Specialized Bicycle Components Incorporated
• Original Assignee: Specialized Bicycle Components Incorporated
• Inventors: Waldron, Bradley L., Sinyard, Mike, DʼAluisio, Christopher P.
• Primary Examiner(s): DePumpo, Daniel G.
• Application Number:
  US10/195,830
• Publication Number:
  US 20040007848A1
• Time in Patent Office: 536 Days
• Field of Search: 280/279, 280/288.3, 280/274, 280/281.1, 280/288
• US Class Current: 280/274
• CPC Class Codes: B62K 19/16 the material being wholly or mainly of plastics
• CPC Class Codes: B62K 21/02 Front wheel forks or equivalent, e.g. single tine
• CPC Class Codes: B62K 2201/02 Rubber springs
• CPC Class Codes: B62K 25/04 for mounting axles resiliently on cycle frame or fork for sidecars, forecars or the like B62K27/06

Abstract

A wheel support portion for a bicycle, such as a front fork assembly, arranged to reduce vibrations that originate at the bicycle wheel and are transmitted to the rider of the bicycle through the wheel support. Desirably, the front fork assembly is configured to be supported by a bicycle frame and includes a pair of fork legs, which extend in a downward direction along opposing sides of a front wheel of the bicycle. Preferably, the fork legs are configured to support the front wheel at their lower ends. An intermediate portion of each of the fork legs defines a cavity. A damping member comprised of a vibration damping material is positioned within the cavity. Preferably, the cavity passes completely through each fork leg in a lateral direction and the damping member is retained within the cavity by a friction fit therebetween.

Claims

1. A bicycle front fork assembly;

comprising;

a steer tube;

a pair of legs extending in a downward direction from said steer tube and spaced from one another in a lateral direction, each of said pair of legs having an upper portion, a lower portion and an intermediate portion and defining a substantially fixed length, said fork assembly being configured to support a wheel at said lower portions of said pair of legs, said pair of legs being interconnected at said upper portion, each of said intermediate portions having an internal wall defining an internal cavity;

a damping member positioned within said cavity and contacting said internal wall, said damping member comprising a vibration damping material;

wherein said internal wall comprises a first side and a second side facing said first side, an middle portion of said first side and second side being curved toward one another such that a width of said cavity is reduced in said middle portion, said damping member shaped to substantially conform to said reduced width of said cavity.

2. A bicycle front fork assembly, comprising:

a steer tube;

a pair of hollow, tubular legs extending in a downward direction from said steer tube and spaced from one another in a lateral direction, each of said pair of legs defining a substantially fixed length, said fork assembly being configured to support a wheel at a lower end of said pair of legs, each of said pair of legs having an outer wall portion and an internal wall portion, said internal wall portion extending from a first side of said outer wall portion to a second side of said outer wall portion opposite said first side and defining an internal cavity;

a damping member positioned within said cavity and contacting said internal wall, said damping member comprising a vibration damping material.

3. The fork assembly of claim 2, wherein said fork assembly is configured to support a wheel for rotation about a hub axis, said internal wall portion being substantially parallel to said hub axis.

4. The fork assembly of claim 2, wherein each of said pair of legs includes an upper portion, an intermediate portion and a lower portion, said internal cavity being located within said intermediate portion of said pair of legs.

5. The fork assembly of claim 2, wherein an entire perimeter of said damping member contacts said internal wall.

6. The fork assembly of claim 5, wherein said damping member includes four sides in horizontal cross-section.

7. The fork assembly of claim 2, wherein said vibration damping material comprises an elastomeric material.

8. The fork assembly of claim 2, wherein each of said pair of legs is curved forwardly in a longitudinal direction such that said lower ends of said pair of legs are spaced to a forward side of an axis defined by said steer tube, said internal cavity being located substantially within said curve.

9. The fork assembly of claim 2, wherein each of said intermediate portions of said pair of legs is curved inwardly in a lateral plane, said damping members being curved to conform with said curved intermediate portions.

10. The fork assembly of claim 9, wherein an outer surface of said damping member is substantially linear.

11. The fork assembly of claim 2, wherein said cavity extends completely through said leg.

12. The fork assembly of claim 11, wherein said cavity extends through said leg in a lateral direction.

13. The fork assembly of claim 2, wherein said internal wall comprises a first side and a second side facing said first side, an middle portion of said first side and second side being curved toward one another such that a width of said cavity is reduced in said middle portion, said damping member shaped to substantially conform to said reduced width of said cavity.

14. A bicycle, comprising:

a frame, said frame supporting a pedal crank assembly and a rear wheel, said pedal crank assembly being configured to drive said rear wheel;

a front fork assembly, said fork assembly being rotatably supported by said frame for pivotal movement about a steering axis, said fork assembly being configured to support a front wheel of said bicycle at a lower end of said fork, said fork assembly comprising;

a steer tube;

a pair of hollow, tubular legs extending in a downward direction from said steer tube and spaced from one another in a lateral direction, each of said pair of legs defining a substantially fixed length, said fork assembly being configured to support a wheel at a lower end of said pair of legs, each of said pair of legs having an outer wall portion and an internal wall portion, said internal wall portion extending from a first side of said outer wall portion to a second side of said outer wall portion opposite said first side and defining an internal cavity;

a damping member positioned within said cavity and contacting said internal wall, said damping member comprising a vibration damping material.

15. The bicycle of claim 14, wherein said fork assembly is configured to support a wheel for rotation about a hub axis, said internal wall portion being substantially parallel to said hub axis.

16. The bicycle of claim 14, wherein each of said pair of legs includes an upper portion, a lower portion and an intermediate portion, said internal cavity being located within said intermediate portion of said pair of legs.

17. The bicycle of claim 14, wherein an entire perimeter of said damping member contacts said internal wall.

18. The bicycle of claim 17, wherein said damping member includes four sides in horizontal cross-section.

19. The bicycle of claim 14, wherein said vibration damping material comprises an elastomeric material.

20. The bicycle of claim 14, wherein each of said pair of legs is curved forwardly in a longitudinal direction such that said lower ends of said pair of legs are spaced to a forward side of an axis defined by said steer tube, said internal cavity being located substantially within said curve.

21. The bicycle of claim 14, wherein each of said intermediate portions of said pair of legs is curved inwardly in a lateral plane, said damping members being curved to conform with said curved intermediate portions.

22. The bicycle of claim 21, wherein an outer surface of said damping member is substantially linear.

23. The bicycle of claim 14, wherein said cavity extends completely through said leg.

24. The bicycle of claim 23, wherein said cavity extends through said leg in a lateral direction.

25. The bicycle of claim 14, wherein said internal wall comprises a first side and a second side facing said first side, an middle portion of said first side and second side being curved toward one another such that a width of said cavity is reduced in said middle portion, said damping member shaped to substantially conform to said reduced width of said cavity.

26. A bicycle, comprising:

a main frame portion;

a front wheel and a rear wheel connected to said main frame portion;

a pedal crank assembly, said pedal crank assembly being supported by the main frame portion and configured to drive said rear wheel;

a wheel support portion connected to said main frame at a first end and supporting one of said front wheel and said rear wheel at a second end, said wheel support portion comprising a pair of legs extending along opposing sides of said one of said front wheel and said rear wheel, each of said pair of legs defining a substantially fixed length, each of said pair of legs having an outer wall portion and an internal wall portion, said internal wall portion extending from a first side of said outer wall portion to a second side of said outer wall portion opposite said first side and defining an internal cavity;

a damping member positioned within said cavity and contacting said internal wall, said damping member comprising a vibration damping material.

27. The bicycle of claim 26, wherein said wheel support portion is configured to support a wheel for rotation about a hub axis, said internal wall portion being substantially parallel to said hub axis.

28. The bicycle of claim 26, wherein each of said pair of legs includes a first end portion, a second end portion and an intermediate portion, said internal cavity being located within said intermediate portion.

29. The bicycle of claim 26, wherein an entire perimeter of said damping member contacts said internal wall.

30. The bicycle of claim 29, wherein said damping member includes four sides in horizontal cross-section.

31. The bicycle of claim 26, wherein said vibration damping material comprises an elastomeric material.

32. The bicycle of claim 26, wherein each of said pair of legs is curved forwardly in a longitudinal direction such that said lower ends of said pair of legs are spaced to a forward side of an axis defined by said steer tube, said internal cavity being located substantially within said curve.

33. The bicycle of claim 26, wherein each of said intermediate portions of said pair of legs is curved inwardly in a lateral plane, said damping members being curved to conform with said curved intermediate portions.

34. The bicycle of claim 33, wherein an outer surface of said damping member is substantially linear.

35. The bicycle of claim 26, wherein said cavity extends completely through said leg.

36. The bicycle of claim 35, wherein said cavity extends through said leg in a lateral direction.

37. The bicycle of claim 26, wherein said internal wall comprises a first side and a second side facing said first side, an middle portion of said first side and second side being curved toward one another such that a width of said cavity is reduced in said middle portion, said damping member shaped to substantially conform to said reduced width of said cavity.

38. A wheel support for a bicycle, comprising:

a first end and a second end, the first end configured to be supportable by a main frame of said bicycle, the second end configured to support a wheel of said bicycle, said wheel support comprising a pair of legs extending along opposing sides of said wheel, each of said pair of legs defining a substantially fixed length, each of said pair of legs having an outer wall portion and an internal wall portion, said internal wall portion extending from a first side of said outer wall portion to a second side of said outer wall portion opposite said first side and defining an internal cavity;

a damping member positioned within said cavity and contacting said internal wall, said damping member comprising a vibration damping material.

39. The wheel support of claim 38, wherein said wheel comprises a rear wheel of said bicycle.

40. The wheel support of claim 38, wherein said pair of legs is a pair of chain stays.

41. The wheel support of claim 38, wherein the pair of legs is a pair of seat stays.