Shoelace folding and releasing device

1. A shoelace tightening and releasing device, comprising:

a thread reel configured to allow a thread to wind thereon, a knob device in transmission connection with the thread reel, and a position-limiting device and an arresting disk arranged between the thread reel and the knob device,

wherein a first master linkage component is disposed on a side of the knob device that faces the thread reel; and a first slave linkage component meshed with the first master linkage component is disposed on a side of the thread reel that faces the knob device;

the arresting disk is provided with a master arresting component; and the knob device is provided with a slave arresting component that is meshed with the master arresting component;

the position-limiting device is provided with a master position-limiting component;

and the knob device is provided with a slave position-limiting component that is engaged with the master position-limiting component;

after the knob device is pressed, both the thread reel and the arresting disk are locked relative to the knob device, the arresting disk restricts a clockwise or counterclockwise rotation of the knob device, and the knob device drives the thread reel to rotate so as to tighten the shoelace;

when the knob device is pulled up, both the thread reel and the arresting disk are unlocked from the knob device, and the thread reel releases the shoelace, and at the same time, the position-limiting device restricts a detachment of the knob device,

wherein the thread reel comprises a winding spindle, a top disk, and a bottom disk arranged at a bottom of the winding spindle; the bottom disk is provided with a bottom through hole allowing the shoelace to pass therethrough; the winding spindle is provided with a spindle hole communicating with the bottom through hole; and the first slave linkage component is disposed at an end of the winding spindle that faces the position-limiting device.

2. The shoelace tightening and releasing device according to claim 1 , wherein the position-limiting device is provided with a receiving cavity for receiving the thread reel; and the receiving cavity is provided with a position-limiting hole allowing the winding spindle to pass therethrough.

3. The shoelace tightening and releasing device according to claim 2 , wherein the master position-limiting component is provided with the position-limiting hole; the master position-limiting component is disposed on an inner peripheral side of the position-limiting hole; and the slave position-limiting component is a lug disposed on an outer peripheral side of the first master linkage component.

4. The shoelace tightening and releasing device according to claim 3 , wherein the slave arresting component is a ratchet disposed protrudingly on a side of the knob device that faces the arresting disk; the master arresting component is a pawl; the arresting disk is provided with an arresting hole allowing the first master linkage component to pass therethrough; and after the arresting disk is locked relative to the knob device, the pawl is meshed with the ratchet.

5. The shoelace tightening and releasing device according to claim 4 , wherein the pawl is a pawl provided with a V-shaped opening.

6. The shoelace tightening and releasing device according to claim 5 , further comprising a base sleeved on a bottom of the position-limiting component, wherein the base is provided with a first threading hole; and a second threading hole is formed in a side of a bottom of the position-limiting device.

7. The shoelace tightening and releasing device according to claim 6 , wherein a position-limiting buckle is disposed on an inner peripheral side of the base; and a bump interlocked with the position-limiting buckle is disposed on an outer peripheral side of the position-limiting device.

8. The shoelace tightening and releasing device according to claim 7 , wherein an engagement buckle configured to restrict a detachment of the arresting disk is further disposed protrudingly on a peripheral side of the position-limiting hole; and an outer diameter of the arresting disk is not less than an inner diameter of the position-limiting device.

9. The shoelace tightening and releasing device according to claim 8 , wherein a number of claws disposed in a triangular shape are provided on a side of the first master linkage component that faces the arresting disk.