Quick string-tying device and method

1. A quick string-tying device, comprising a first case body, the first case body being provided with a first bottom portion, a first open end, and a first sidewall extending and formed from the first bottom portion towards the first open end, the first bottom portion and the first sidewall forming a first accommodation space, the first bottom portion being provided with a first string-passing opening for two free ends of a string to pass therethrough, a slit formed on the first sidewall and extending from the first open end towards the first bottom portion, the slit being used to clamp the two free ends of the string which enter into the slit;

wherein the slit comprises a V-shaped opening section and an upright section connected to the V-shaped opening section, and a width of a narrowest gap of the V-shaped opening section which is joined to the upright section is smaller than a width of the string.

2. The quick string-tying device according to claim 1 , wherein the slit gradually tapers along a direction from the first open end towards the first bottom portion.

3. The quick string-tying device according to claim 1 , wherein the first bottom portion is provided with two first string-passing openings for passing the two ends of the string therethrough respectively.

4. The quick string-tying device according to claim 1 , wherein the first sidewall is formed with a second slit extending from the first open end towards the first bottom portion.

5. The quick string-tying device according to claim 1 , further comprising a second case body, the second case body comprising a second bottom portion, a second open end, and a second sidewall extending and formed from the second bottom portion towards the second open end, the second bottom portion and the second sidewall forming a second accommodation space, the second case body being provided with a second string-passing opening for the two free ends of the string to pass therethrough.

6. The quick string-tying device according to claim 5 , wherein the first case body and the second case body are connected by a connecting portion.

7. The quick string-tying device according to claim 6 , wherein the second string-passing opening is provided on the second bottom portion of the second case body.

8. The quick string-tying device according to claim 5 , wherein the second case body extends from an outer side of the first sidewall of the first case body in a direction away from the first sidewall, the second bottom portion being formed at the first sidewall.

9. The quick string-tying device according to claim 8 , wherein the second string-passing opening is provided on the second sidewall or the second bottom portion.

10. A method for tying a string, comprising:

providing a quick string-tying device, the quick string-tying device comprising a first case body, the first case body being provided with a first bottom portion, a first open end, and a first sidewall extending and formed from the first bottom portion towards the first open end, the first bottom portion and the first sidewall forming a first accommodation space, the first bottom portion being provided with a first string-passing opening, a slit formed on the first sidewall and extending from the first open end towards the first bottom portion;

passing two free ends of a string through the first string-passing opening;

tying a slipknot with the two free ends or twisting the two free ends against each other to form a twisted portion; and

moving the first case body upwards, or pulling the slipknot or the twisted portion downwards and into the first accommodation space, so that the slipknot or the twisted portion is clamped by the first accommodation space.

11. The method for tying a string according to claim 10 , wherein the first bottom portion is provided with two first string-passing openings, and the passing step comprises passing the two free ends of the string through the two first string-passing openings respectively.

12. The method for tying a string according to claim 10 , further comprising, after the slipknot or the twisted portion is clamped by the first accommodation space, forcing the two free ends of the string into the slit.

13. A method for tying a string, comprising:

providing a quick string-tying device, the quick string-tying device comprising a first case body, the first case body being provided with a first bottom portion, a first open end, and a first sidewall extending and formed from the first bottom portion towards the first open end, the first bottom portion and the first sidewall forming a first accommodation space, the first bottom portion being provided with a first string-passing opening, a slit formed on the first sidewall and extending from the first open end towards the first bottom portion, and a second case body, the second case body comprising a second bottom portion, a second open end, and a second sidewall extending and formed from the second bottom portion towards the second open end, the second bottom portion and the second sidewall forming a second accommodation space, the second case body being provided with a second string-passing opening;

passing two free ends of a string through the first string-passing opening;

tying a first slipknot with the two free ends or twisting the two free ends against each other to form a twisted portion;

continuously passing the two free ends through the second string-passing opening;

tying a second slipknot with the two free ends;

pulling the second slipknot into the second accommodation space so that the two free ends are secured in the second accommodation space; and

adjusting a length of the two free ends between the first and second case bodies so that the first slipknot or the twisted portion is locked in the first accommodation space.

14. The method for tying a string according to claim 13 , wherein the first bottom portion is provided with two first string-passing openings, and the passing step comprises passing the two free ends of the string through the two first string-passing openings respectively.

15. The method for tying a string according to claim 13 , further comprising:

pressing a portion of the two free ends between the first and second case bodies into the slit.