JP2017206220A - Device for eliminating chain looseness and preventing separation from foldable bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device capable of operating as a device for applying a tension to a chain of a foldable bicycle, as well as, as a chain watcher, and also as a device for winding the loosened chain to prevent the chain from separation at folding.SOLUTION: A device for foldable bicycle fits a disc mounted with: an arm 4 attached with a pulley 3; and an arm 2 attached with a cylinder 1, through which a chain passes; into a periphery of a bottom bracket, connects the disc with a frame 27 via a spring, inserts the chain 22 into the cylinder 1, and puts the chain onto a chain ring so that a pulley is arranged under the chain, to cause the pulley energized by the spring to eliminate looseness of the chain. When the chain ring rotates counterclockwise 25 to cause the chain to be likely to separate, the pulley pushes back the chain to prevent the chain from separation. When the bicycle is folded, the device winds the loosened chain to prevent the chain from separation. For a short chain, the arm 4 attached to the pulley rotates counterclockwise 25 to prevent the chain from breaking. The other arm with the cylinder pulls the chain to prevent the chain from separation from the chain ring.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a device for eliminating loosening of a folding bicycle chain and preventing it from coming off.

  Bicycle chains are gradually stretched during use and easily come off the chain ring, but a device for tensioning the chain is required to save the trouble of adjusting each time. In addition, when the folding bicycle is folded, the distance between the chain ring and the driving wheel is reduced, and the chain is loosened and easily falls off, so a device for winding the slack chain is required.

  In addition, since the bicycle has a drawback that the chain is easily detached from the chain ring when the chain ring is rotated in the reverse direction, it is convenient to include a device called a chain watcher that prevents the chain from coming off due to the reverse rotation of the chain ring.

  However, if a folding bicycle that emphasizes portability is equipped with both a chain tensioner device and a chain watcher, the weight and folding size increase, and the number of parts increases, causing failure.

  Folding bicycles are difficult to equip with both a chain watcher and a device that hangs the chain tensioner to the optimal position due to its light weight and limited space on the folding mechanism.

  There are other belt drive devices and shaft drive devices as methods for transmitting driving force to the bicycle drive wheel. The belt of the belt drive device is gradually stretched during use in the same way as the chain of the chain drive device, and the drive efficiency Therefore, a tensioner device that eliminates the slack of the belt is necessary, and the shaft drive device is not easily disengaged, but its weight is heavy, so the demerit is larger than the merit that is adopted for a folding bicycle.

  Equipped with a device that tensions the folding bicycle chain and a device that prevents the chain from falling off when it is folded with the chain watcher in a limited space without increasing the weight.

  The main feature of the present invention is that a chain watcher with two kinds of arms is fitted around the bottom bracket and fixed to the frame with a spring without being fixed.

  The present invention provides a chain tensioner that eliminates loosening of a bicycle chain by a simple method of attaching a spring to the chain watcher, a chain watcher that eliminates chain disengagement due to reverse rotation of the chainring, and a chain ring when folding a bicycle. A total of three functions of the chain drop prevention device that winds up the loose chain as the driving wheel approaches can be performed by one, so that there is an advantage that the weight and manufacturing cost of the bicycle can be reduced.

It is sectional drawing of this invention. It is a top view of the present invention. It is sectional drawing of the screw which fixes the cover which prevents this invention from falling off from the bottom bracket of a bicycle, and a cover around a bottom bracket. It is an image figure of the folding bicycle equipped with this invention. It is an image figure in which the bicycle equipped with the present invention is folded and the present invention operates.

  FIG. 4 shows an image of a folding bicycle equipped with the present invention. The arm (4) with the pulley (3) attached to the tip and the arm (2) with the tube (1) passing the chain (22) attached to the tip (2) The disk (8) to which is attached is fitted around the bottom bracket (19) and is connected by the frame (27) and the spring (9).

  When the chain (22) is passed through the cylinder (1) and hung on the chain ring (23) so that the pulley (3) is at the lower end, the pulley (3) is pulled clockwise (24) by the force of the spring (9). Tension is always applied to the chain (22), and the loosening is eliminated by the chain (22) extending.

  When the chain ring (23) rotates in the reverse direction and the chain (22) is likely to come off, the pulley (3) pushes back the chain (22) and prevents the chain (22) from coming off.

  When folded, the driving wheel (26) is stored under the frame (27), the distance between the driving wheel (26) and the chain ring (23) is reduced, and the slackened chain (22) is moved to the pulley (3) and the arm (4). ) Rotates clockwise (24) and winds up. However, when the chain (22) is short, the chain (22) is prevented from being broken by rotating in the counterclockwise direction (25). At this time, the cylinder (1) and the arm (2) are also rotated counterclockwise (25) while pulling the chain (22) along the outer periphery of the chain ring (23), so that the chain (22) 23) Do not deviate from the above.

  It can be used as a chain tensioner to prevent loosening and falling off of various bicycle chains simply by giving the chain watcher a tension function.

1. Tube 15. Hole 2. Arm 16. Hole 3. Pulley 17. Screw 4. Arm 18. Screw 5. Protrusion 19. Bottom bracket 6. Slotted hole 20. Screw hole 7. Slotted hole 21. Screw hole 8. Disc 22. Chain 9. Spring 23. Chain ring 10. One end of spring 24. 10. clockwise direction One end of spring 25. Counterclockwise direction 12. Cover 26. Drive wheel 13. Groove 27. Frame 14. groove

Claims (3)

  A chain tensioner that attaches a chain watcher with a pulley or a cylinder with little friction with the tip to the bottom bracket of the bicycle, connects the chain watcher and the frame with a spring without fixing, and tensions the chain.   Fit a chain watcher with a pulley or a cylinder with little friction with the chain around the bottom bracket of the bicycle and connect it with a spring without fixing the chain watcher and frame, and loosen when the folding bicycle is folded A chain tensioner that winds up the chain to prevent the chain from falling off and rotates around the bottom bracket to adjust the tension of the chain so that it does not break even if the chain is pulled strongly.   Fit the chain watch that passes the chain to the tip, the chain watcher arm, and the pair of chain watchers around the bottom bracket of the bicycle. A device that prevents the chain from falling off when the chain is folded.

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