FLOATING FRONT RING

• US 20130008282A1
• Filed: 07/09/2012
• Published: 01/10/2013
• Est. Priority Date: 07/08/2011
• Status: Abandoned Application

• Current Assignee: Paha Designs, LLC.
• Original Assignee: Paha Designs, LLC.
• Inventors: Johnson, Lee, Meager, Benjamin
• Application Number:
  US13/544,669
• Publication Number:
  US 20130008282A1
• Time in Patent Office: Days
• US Class Current: 74/594.2
• CPC Class Codes: B62M 3/00 Construction of cranks operated by hand or foot
• CPC Class Codes: B62M 9/12 the chain, belt, or the like being laterally shiftable , e.g. using a rear derailleur
• CPC Class Codes: B62M 9/14 the wheels being laterally shiftable
• CPC Class Codes: F16D 3/06 specially adapted to allow axial displacement
• CPC Class Codes: Y10T 74/2165 with attached gear

Abstract

A bicycle transmission system is provided herein. The bicycle transmission system includes a sprocket or ring that is capable of sliding amongst an infinite number of lateral positions relative to a crank arm. The movement of the sprocket or ring facilitates an optimal chain path from the sprocket or ring to another sprocket or ring in the transmission system and, therefore, increases the efficiency with which power is transferred through the system.

Claims

1. A bicycle transmission system, comprising:

a crankset including a float element and at least one sprocket configured to rotate in a first rotational direction and further configured to move in a direction substantially perpendicular to the first rotational direction via the float element.

2. The system of claim 1, wherein the at least one sprocket is configured to move freely between a first position and a second position, the first position corresponding to a first lateral distance from a crank arm of the crankset, the second position corresponding to a second lateral distance from the crank arm, the second lateral distance being greater than the first lateral distance.

3. The system of claim 2, wherein the first lateral distance corresponds to a minimum displacement distance, wherein the second lateral distance corresponds to a maximum displacement distance, and wherein the at least one sprocket is allowed to move and rest at any position between the minimum displacement distance and the maximum displacement distance.

4. The system of claim 3, further comprising:

a chain having a plurality of chain joints, at least some of the chain joints being configured to interface with teeth of the at least one sprocket and wherein forces which angle the chain joints relative to one another are also capable of moving the at least one sprocket laterally along the float element.

5. The system of claim 4, further comprising:

a set of sprockets including an inner sprocket and an outer sprocket, wherein a selected one of the set of sprockets is connected to the at least one sprocket via the chain, wherein rotational forces exerted on the chain via the at least one sprocket cause the set of sprockets to rotate, wherein the float element is configured to automatically move to the first position when the selected sprocket is the inner sprocket, and wherein the float element is configured to automatically move to the second position when the selected sprocket is the outer sprocket.

6. The system of claim 1, wherein the float element comprises a shaft extending from a portion of a crank arm and a slider bracket configured to interface with the at least one sprocket such that when the slider bracket moves the at least one sprocket also moves, wherein the shaft comprises an outer surface and the slider bracket comprises an inner surface that interfaces with the outer surface of the shaft thereby enabling the slider bracket to move laterally along the outer surface of the shaft.

7. The system of claim 6, wherein the outer surface of the shaft is cylindrical and substantially smooth and wherein the inner surface of the slider bracket is also substantially smooth and comprises a radius that is larger than a radius of the outer surface of the shaft.

8. The system of claim 6, wherein the outer surface of the shaft comprises at least one of a recessed and raised feature that extends the length of the shaft and wherein the inner surface of the slider bracket comprises at least one complimentary feature that interfaces with the at least one of a recessed and raised feature of the outer surface of the shaft.

9. The system of claim 6, wherein the float element comprises a stopper that interfaces with the slider bracket when the at least one sprocket is at a maximum displacement position.

10. The system of claim 1, wherein the float element rides along at least one of a track, groove, rail, notch, and slot provided in a main body and wherein at least one of the float element and the main body comprise at least one ball bearing to facilitate lateral movement of the float element along the length of the main body.

11. The system of claim 10, wherein the at least one ball bearing is sealed.

12. The system of claim 1, wherein the float element integral to a crank arm of the crankset

13. The system of claim 1, wherein the at least one sprocket is a single sprocket.

14. A crankset for use with a transmission system, the crankset comprising:

a crank arm comprising a distal end and a proximate end being co-located with a rotational hub, the distal end being configured to rotate about the proximate end;

at least one float element operatively connected with the crank arm and also being configured to rotate about the proximate end; and

a sprocket configured to rotate about the proximate end as well as move laterally with respect to the crank arm via the at least one float element.

15. The crankset of claim 14, wherein the sprocket is configured to move laterally amongst an infinite number of lateral positions between a minimum displacement position and a maximum displacement position, wherein the sprocket is one of a plurality of sprockets.

17. The crankset of claim 14, wherein the at least one float element and the crank arm are a single unitary piece of material.

18. The crankset of claim 14, wherein the at least one float element comprises at least one bearing.

19. The crankset of claim 14, wherein the at least one float element comprises a shaft and slider bracket, the slider bracket being connectable to the sprocket and being configured to slide laterally along the shaft.

16. (canceled)

20. A method of operating a bicycle transmission system, comprising:

rotating a sprocket about a point of rotation;

receiving, at the sprocket from a chain, at least one force that is transverse to the rotation of the sprocket; and

in response to the at least one force, moving the sprocket in a direction that is substantially perpendicular to the rotation of the sprocket.

21. The method of claim 20, wherein the at least one force is received in response to changing gears of the bicycle, wherein the sprocket is moved from a first distance away from a crank arm to a second different distance away from the crank arm.

22. (canceled)