CN220512335U - Lock-free pull tab and zipper comprising same - Google Patents

Abstract

The utility model discloses a lock-free pull tab slider and a zipper comprising the same, wherein the slider comprises a slider main body, the slider main body is provided with an upper wing plate and a lower wing plate which are relatively parallel, and a guide column arranged at the front end side of the slider main body, the upper wing plate, the lower wing plate and the upper guide plate enclose a chute for sliding through a zipper tooth, and the front end of the upper wing plate is provided with at least two upper wing sliding parts with inner side surfaces in different planes so as to form a ladder structure at the front end of the upper wing plate; the front end of the lower wing plate is provided with at least two lower wing sliding parts with inner side surfaces in different planes so as to form a ladder structure at the front end of the lower wing plate; along the height direction of the pull head main body, the height of the sliding groove close to the front end side of the pull head main body is larger than the height close to the rear end side of the pull head main body, and the step structure can lead the chain teeth to finish the actions of separating and combining at the front end of the pull head main body better due to the height difference of the inner side surfaces of the upper wing plate and the lower wing plate.

Description

Lock-free pull tab and zipper comprising same

Technical Field

The utility model belongs to the technical field of zippers, and particularly relates to a lock-free pull tab and a zipper comprising the same.

Background

In order to prevent the automatic movement of the slider, the existing slider is provided with a locking structure on the slider body, for example, a lock hook extending into a sliding groove of the slider body is connected to a nose of the slider body, and the nose is pulled by the pull piece to separate the lock hook from the fastener element, so that the slider is moved, and the zipper fastener is combined and separated. At present, a pull tab connecting part of a pull tab (pull tab) is usually arranged on the upper surface of an upper wing plate, and for a nylon zipper, due to the characteristic of a zipper structure, the front surface and the back surface are asymmetric, so that two matching modes of forward pulling and back pulling exist; if the pull tab connecting part is arranged on the upper surface of the wing plate at one side of the pull head, the pull head cannot be matched with the positive pull and the back pull zipper; if the pull tab connecting parts are arranged on the upper surfaces of the wing plates at the two sides of the pull head, the production cost can be increased. In some scenes, for aesthetic purposes and special requirements, a pull tab (pull tab) structure needs to be canceled, the sliding grooves formed by the upper wing plate and the lower wing plate of the existing pull tab pull head are mostly of smooth structures, and the thickness of the upper wing plate is quite different from the height of the sliding grooves, so that the problem that the pull of the original pull tab pull head is unsmooth under the condition of not using the pull tab.

In view of the problems in the above-mentioned circumstances, there is a need to provide a slider for a slide fastener without lock and pull tab, which can be simultaneously matched with a forward-pull and back-pull slide fastener, and which increases the applicability of the product; meanwhile, the pull tab is removed, and meanwhile, the smoothness of pull of the pull head is ensured.

Disclosure of Invention

The utility model aims to provide a lock-free pull tab slider to solve the technical problems, wherein an upper wing sliding part and a lower wing sliding part with height differences are respectively arranged on the inner side surfaces of an upper wing plate and a lower wing plate to form a ladder structure; meanwhile, the pull tab is removed, and meanwhile, the smoothness of pull of the pull head can be ensured.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the lock-free pull tab-free pull head comprises a pull head main body, wherein the pull head main body is provided with an upper wing plate, a lower wing plate and a guide column, the upper wing plate and the lower wing plate are relatively parallel, the guide column is arranged at the front end side of the pull head main body and is used for connecting the upper wing plate and the lower wing plate, the left side and the right side of the upper wing plate extend towards the direction of the lower wing plate and are provided with upper guide plates, an engagement gap for engaging a zipper belt is formed between the upper guide plates and the lower wing plate, and the upper wing plate, the lower wing plate and the upper guide plates enclose a chute for sliding through of a zipper tooth;

the front end of the upper wing plate is provided with at least two upper wing sliding parts with inner side surfaces in different planes so as to form a ladder structure at the front end of the upper wing plate;

the front end of the lower wing plate is provided with at least two lower wing sliding parts with inner side surfaces in different planes so as to form a ladder structure at the front end of the lower wing plate;

the height of the inner side surface of the upper wing sliding part close to the front port of the chute is higher than that of the inner side surface of the upper wing sliding part far away from the front port of the chute, and the height of the inner side surface of the lower wing sliding part close to the front port of the chute is lower than that of the inner side surface of the lower wing sliding part far away from the front port of the chute, so that the height distance formed by the chute at the front port is the largest.

Preferably, the upper wing sliding part comprises a first upper wing sliding part arranged close to the front port of the sliding groove and a second upper wing sliding part connected with the first upper wing sliding part, the inner side surface of the first upper wing sliding part is higher than the inner side surface of the second upper wing sliding part along the height direction of the pull head, and the first upper wing sliding part extends inwards to not exceed the rear end of the guide post along the length direction of the upper wing plate;

the lower wing sliding part comprises a first lower wing sliding part and a second lower wing sliding part, wherein the first lower wing sliding part is arranged close to the front port of the sliding groove, the second lower wing sliding part is connected with the first lower wing sliding part, the height of the inner side surface of the first lower wing sliding part is lower than that of the inner side surface of the second lower wing sliding part along the height direction of the pull head, and the first lower wing sliding part extends inwards to be not more than the rear end of the guide post along the length direction of the lower wing plate.

By the arrangement, the first upper wing sliding part is communicated with the front port of the sliding groove, the first upper wing sliding part and the second upper wing sliding part form a height difference, the first lower wing sliding part is communicated with the front port of the sliding groove, and the first lower wing sliding part and the second lower wing sliding part form a height difference, so that a transition guide area can be formed between the first upper wing sliding part and the first lower wing sliding part when the rear end side of the slider main body is pushed, and the zipper teeth can be smoothly meshed when the zipper teeth pass through the guide area.

Preferably, the first upper wing sliding part extends to the side edge of the upper wing plate along the width direction of the slider main body, and the side edge of the first upper wing sliding part is an arc edge; along the width direction of the slider main body, the first lower wing sliding part extends to the side edge of the lower wing plate, and the side edge of the first lower wing sliding part is an arc-shaped edge.

When the slider slides, the contact between the two sides of the first upper wing sliding part and the first lower wing sliding part on the front end side of the slider body and the zipper strips is arc contact, so that the friction resistance when the slider closes the zipper is reduced, and the smoothness when the zipper closes the zipper is improved.

Preferably, one side of the first upper wing sliding part, which is close to the guide post, extends inwards to a position which is 1/5-2/3 of the distance from the front end side of the guide post along the length direction of the upper wing plate;

one side of the first lower wing sliding part, which is close to the guide post, extends inwards to a position which is 1/5-2/3 of the distance from the front end side of the guide post along the length direction of the lower wing plate.

By the arrangement, the problems that the first upper wing sliding part and the first lower wing sliding part are too long or too short, and the chain combination is unstable can be avoided.

More preferably, a side of the first upper wing sliding part, which is close to the guide post, extends inwards to a position which is 1/4-1/2 of the distance from the front end side of the guide post along the length direction of the upper wing plate;

one side of the first lower wing sliding part, which is close to the guide post, extends inwards to a position which is 1/4-1/2 of the distance from the front end side of the guide post along the length direction of the lower wing plate.

Preferably, lengths extending to the rear end side of the slider body at different positions along a side of the first upper wing sliding part near the guide post to a side of the first upper wing sliding part near the side edge of the upper wing plate are different;

the lengths of the first lower wing sliding parts extending to the rear end side of the slider body at different positions are different along one side of the first lower wing sliding parts, which is close to the guide post, to one side of the first lower wing sliding parts, which is close to the side edge of the lower wing plate.

Preferably, the length of each region of the first upper wing sliding part extending towards the rear end side of the slider body is gradually increased along the direction from the side of the first upper wing sliding part near the guide post to the side of the first upper wing sliding part near the side edge of the upper wing plate, so that the connection part of the first upper wing sliding part and the second upper wing sliding part forms an arc wall which is bent backwards;

and along the direction from one side of the first lower wing sliding part close to the guide post to one side of the first lower wing sliding part close to the side edge of the lower wing plate, the length of each region of the first lower wing sliding part extending towards the rear end side of the slider main body is gradually increased, so that the connection part of the first lower wing sliding part and the second lower wing sliding part forms an arc-shaped wall which is bent backwards.

By the arrangement, the arc-shaped wall is formed at one end of the second upper wing sliding part, which is close to the first upper wing sliding part, and the arc-shaped wall is formed at one end of the second lower wing sliding part, which is close to the first lower wing sliding part, when the zipper teeth and the zipper belt enter the second upper wing sliding part/the second lower wing sliding part through the first upper wing sliding part/the first lower wing sliding part, the guide of the arc-shaped wall at the front end of the second upper wing sliding part/the second lower wing sliding part can be obtained, the resistance in the process of closing the zipper is reduced, and the zipper can be smoothly closed under the pushing of external force by the pull head without the pull tab.

Preferably, the second upper wing sliding part extends to the rear end side of the upper wing plate along the length direction of the upper wing plate, and the upper guide plate is arranged in a partial area of the second upper wing sliding part near the rear end side of the upper wing plate;

the second lower wing sliding part extends to the rear end side of the lower wing plate along the length direction of the lower wing plate, and a lower guide strip corresponding to the upper guide plate is arranged in a partial area of the second lower wing sliding part, which is close to the rear end side of the lower wing plate.

Preferably, the height of the sliding groove near the front end side of the slider body is greater than the height near the rear end side of the slider body along the height direction of the slider body.

Preferably, the ratio of the height of the second upper wing sliding part to the height of the upper guide plate extension is 1:1-1:2 along the height direction of the slider main body; the ratio of the height of the second upper wing sliding part to the height of the sliding groove close to the rear end side of the slider main body is 1:1-1:2.

The upper wing plate is provided with enough height at the rear end side, so that when the pull head is pushed by the rear end side of the pull head main body, enough contact surface can be provided with the pull head main body, and the pull head without a lock and a pull tab can be better pushed.

Preferably, the rear end side of the guide post is further provided with an upper guide bar and a lower guide bar in an extending manner, the upper guide bar is arranged on the second upper wing sliding part, and the lower guide bar is arranged on the second lower wing sliding part.

Preferably, the outer surface of the upper wing plate and the outer surface of the lower wing plate are both curved surfaces.

Another object of the present utility model is to provide a slide fastener comprising a first fastener tape, a second fastener tape, and a slider for a slide fastener for manipulating engagement or disengagement of a fastener element on the first fastener tape and a fastener element on the second fastener tape, wherein the slider for a slide fastener is the lock-less pull tab described in any one of the above.

The beneficial effects are that:

the locking structure and the pull tab of the pull tab are omitted, the pull tab can slide under the condition that the pull tab is not pulled, so that the zipper can be opened and closed, the pull tab can open the zipper under the condition that the zipper tape is subjected to left and right pulling force, after external force disappears, the pull tab automatically slides downwards under the drive of dead weight, so that the closure of the zipper tape is completed, or the pull tab can slide under the drive of the rear side of the pull tab, so that the closure of the zipper tape is completed, and compared with the existing non-locking pull tab, the pull tab can slide more smoothly and close the zipper tooth tape better; the front ends of the upper wing plate and the lower wing plate are respectively provided with an upper wing sliding part and a lower wing sliding part, the inner side surfaces of the upper wing sliding part and the lower wing sliding part are positioned in different planes, so that the front ends of the upper wing plate and the lower wing plate are respectively provided with a ladder structure, the ladder structure can better guide the slider main body to guide the element rows under the condition of no lock, when the zipper strips on the two sides of the slider are acted by external force, the ladder structure can form a height difference on the inner side surfaces of the upper wing plate/the lower wing plate, and therefore the element rows can be better guided to finish the actions of separating and combining the chains at the front end of the slider main body, so that the lock-free pull-tab slider of the scheme can slide more smoothly, and the condition of blocking is prevented.

The lock-free pull tab disclosed by the utility model can reduce the weight of a product after the pull tab connecting parts on the outer surfaces of the upper wing plate and the lower wing plate are removed, and the procedure of buckling the pull tab connecting parts in the subsequent production and assembly can be omitted, so that the production cost can be greatly reduced; meanwhile, the upper wing plate and the lower wing plate can be directly contacted with a human body, so that the comfort level in use is improved, the abrupt sense of the pull tab is reduced, and after the pull tab link parts on the outer surfaces of the upper wing plate and the lower wing plate are removed, large-area logo, trademark, pattern and the like can be added on the outer surfaces of the upper wing plate and the lower wing plate, and the selling point of a product is promoted.

Drawings

FIG. 1 is a diagram showing a front view direction of a lock-free pull tab of the present utility model;

FIG. 2 is an enlarged view of a portion of the structure of FIG. 1;

FIG. 3 is a view showing a structure of a lock-free pull tab of the present utility model in a bottom view;

FIG. 4 is a view showing a structure of a rear view of a lock-less pull tab of the present utility model;

reference numerals

1. An upper wing plate; 11. a first upper wing sliding part; 12. a second upper wing sliding part; 2. a lower wing plate; 21. a first lower wing sliding section; 22. a second lower wing sliding part; 221. an arc-shaped wall; 3. a guide post; 4. an upper guide plate; 5. a lower guide bar; 6. a lower guide bar; 7. a chute; 8. arc-shaped edges.

Detailed Description

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following description will explain the specific embodiments of the present utility model with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the utility model, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.

The technical scheme of the utility model is described in detail in the following by specific embodiments.

Example 1

Referring to fig. 1 to 3, a lock-free pull tab-free slider comprises a slider body having an upper wing plate 1 and a lower wing plate 2 which are relatively parallel, and a guide post 3 provided at the front end side of the slider body, the guide post 3 being for connecting the upper wing plate 1 and the lower wing plate 2, the left and right sides of the upper wing plate 1 being provided with an upper guide plate 4 extending toward the lower wing plate 2, an engagement gap for engaging a fastener tape being formed between the upper guide plate 4 and the lower wing plate 2, the upper wing plate 1, the lower wing plate 2, the upper guide plate 4 enclosing a chute 7 for sliding through a fastener element,

the front end of the upper wing plate 1 is provided with at least two upper wing sliding parts with inner side surfaces in different planes so as to form a ladder structure at the front end of the upper wing plate 1;

the front end of the lower wing plate 2 is provided with at least two lower wing sliding parts with inner side surfaces in different planes so as to form a ladder structure at the front end of the lower wing plate 2;

the height of the inner side surface of the upper wing sliding part close to the front port of the chute 7 is higher than that of the inner side surface of the upper wing sliding part far away from the front port of the chute 7, and the height of the inner side surface of the lower wing sliding part close to the front port of the chute 7 is lower than that of the inner side surface of the lower wing sliding part far away from the front port of the chute 7, so that the height distance formed by the chute 7 at the front port is the largest.

The slider of the embodiment is a non-locking and non-pull-tab slider on the basis of not having a pull tab and a lock hook, and can slide under the condition that the pull tab is not pulled, so that the zipper can be opened and closed, when the zipper strip is subjected to left and right pulling force, the zipper can be opened, after external force disappears, the slider automatically slides downwards under the drive of self weight, so that the closure of the zipper strip is completed, or the rear side of the slider is pushed, the slider can also slide, so that the closure of the zipper strip is completed, and compared with the existing non-locking slider, the slider can slide more smoothly and the zipper tooth strip is better closed; the front ends of the upper wing plate 1 and the lower wing plate 2 are respectively provided with an upper wing sliding part and a lower wing sliding part, the inner side surfaces of which are positioned in different planes, so that the front ends of the upper wing plate 1 and the lower wing plate 2 are respectively provided with a ladder structure, the ladder structure can better guide the slider main body to guide the element rows under the condition of no lock, and when the zipper strips on the two sides of the slider are acted by external force, the ladder structure can lead the inner side surfaces of the upper wing plate 1/the lower wing plate 2 to finish the actions of separating and closing the chains, so that the action of the element rows on the front end of the slider main body can be better guided, and the lock-free pull-tab slider of the scheme can slide more smoothly, thereby preventing the condition of blocking.

The upper wing sliding part comprises a first upper wing sliding part 11 arranged near the front end of the sliding chute 7 and a second upper wing sliding part 12 connected with the first upper wing sliding part 11, the height of the inner side surface of the first upper wing sliding part 11 is higher than that of the inner side surface of the second upper wing sliding part 12 along the height direction of the pull head, and the first upper wing sliding part 11 extends inwards to not more than the rear end of the guide post 3 along the length direction of the upper wing plate 1;

the lower wing sliding part comprises a first lower wing sliding part 21 arranged close to the front port of the chute 7 and a second lower wing sliding part 22 connected with the first lower wing sliding part 21, the height of the inner side surface of the first lower wing sliding part 21 is lower than that of the inner side surface of the second lower wing sliding part 22 along the height direction of the slider, and the first lower wing sliding part 21 extends inwards to not more than the rear end of the guide column 3 along the length direction of the lower wing plate 2.

By this arrangement, the first upper wing sliding part 11 can be made to communicate with the front port of the slide groove 7, and the first upper wing sliding part 11 and the second upper wing sliding part 12 are made to communicate with the front port of the slide groove 7, and the first lower wing sliding part 21 and the second lower wing sliding part 22 are made to communicate with each other, so that when the rear end side of the slider body is pushed, a transition guide area can be formed between the first upper wing sliding part 11 and the first lower wing sliding part 21, facilitating smoother engagement of the fastener element through the guide area.

The first upper wing sliding part 11 extends to the side edge of the upper wing plate 1 along the width direction of the slider main body, and the side edge of the first upper wing sliding part 11 is an arc edge 8; along the width direction of the slider body, the first lower wing sliding part 21 extends to the side edge of the lower wing plate 2, and the side edge of the first lower wing sliding part 21 is an arc edge 8.

When the slider slides, the contact between the two sides of the first upper wing sliding part 11 and the first lower wing sliding part 21 on the front end side of the slider body and the fastener tapes is arc-shaped, so that the friction resistance when the slider closes the fastener is reduced, and the smoothness when the fastener closes the fastener is improved.

The side of the first upper wing sliding part 11, which is close to the guide column 3, extends inwards to 1/5-2/3 of the position of the front end side of the guide column 3 along the length direction of the upper wing plate 1;

the side of the first lower wing sliding part 21 near the guide post 3 extends inward in the longitudinal direction of the lower wing plate 2 to 1/5 to 2/3 of the distance from the front end side of the guide post 3.

By this arrangement, the first upper wing sliding part 11 and the first lower wing sliding part 21 can be prevented from being excessively long or short, and thus the problem of unstable chain combination can be avoided.

The lengths of the first upper wing sliding parts 11 extending to the rear end side of the slider body at different positions are different along the side of the first upper wing sliding parts 11 close to the guide posts 3 to the side of the first upper wing sliding parts 11 close to the side edges of the upper wing plates 1;

the lengths of the first lower wing sliding part 21 extending to the rear end side of the slider body at different positions are different along the side of the first lower wing sliding part 21 near the guide post 3 to the side of the first lower wing sliding part 21 near the side edge of the lower wing plate 2.

Further, along the direction from the side of the first upper wing sliding part 11 near the guide post 3 to the side of the first upper wing sliding part 11 near the side edge of the upper wing plate 1, the lengths of the respective regions of the first upper wing sliding part 11 extending toward the rear end side of the slider body are gradually increased so that the connection part of the first upper wing sliding part 11 and the second upper wing sliding part 12 forms a curved wall 221 which is curved backward;

the length of each region of the first lower wing sliding part 21 extending toward the rear end side of the slider body gradually increases in the direction from the side of the first lower wing sliding part 21 near the guide post 3 to the side of the first lower wing sliding part 21 near the side edge of the lower wing plate 2, so that the junction of the first lower wing sliding part 21 and the second lower wing sliding part 22 forms an arc-shaped wall 221 curved backward.

By this arrangement, the arc wall 221 is formed at the end of the second upper wing sliding part 12 close to the first upper wing sliding part 11, and the arc wall 221 is formed at the end of the second lower wing sliding part 22 close to the first lower wing sliding part 21, when the fastener element and the fastener tape pass through the first upper wing sliding part 11/the first lower wing sliding part 21 and enter the second upper wing sliding part 12/the second lower wing sliding part 22, the guide of the arc wall 221 at the front end of the second upper wing sliding part 12/the second lower wing sliding part 22 can be obtained, the resistance during the chain combining is reduced, and the slider without the pull tab can smoothly complete the chain combining action under the pushing of external force.

The second upper wing sliding part 12 extends to the rear end side of the upper wing plate 1 along the length direction of the upper wing plate 1, and the upper guide plate 4 is arranged in a partial area of the second upper wing sliding part 12 near the rear end side of the upper wing plate 1;

the second lower wing sliding part 22 extends to the rear end side of the lower wing plate 2 along the length direction of the lower wing plate 2, and a lower guide bar 5 corresponding to the upper guide plate 4 is provided in a partial region of the second lower wing sliding part 22 near the rear end side of the lower wing plate 2.

Along the height direction of the slider body, the height of the sliding groove 7 near the front end side of the slider body is larger than the height near the rear end side of the slider body.

Referring to fig. 4, the ratio of the height of the second upper wing sliding part 12 to the height of the upper guide plate 4 extending along the height direction of the slider body is 1:1-1:2; the ratio of the height of the second upper wing sliding part 12 to the height of the sliding groove 7 near the rear end side of the slider body is 1:1-1:2.

The upper blade 1 is provided so as to have a sufficient height on the rear end side, so that a sufficient contact surface with the slider body is ensured when the slider is pushed on the rear end side of the slider body, and the lock-free pull tab-free slider can be pushed more favorably.

Preferably, the rear end side of the guide post 3 is further extended with an upper guide bar and a lower guide bar 6, the upper guide bar is disposed on the second upper wing sliding part 12, and the lower guide bar 6 is disposed on the second lower wing sliding part 22.

The outer surface of the upper wing plate 1 and the outer surface of the lower wing plate 2 are both curved surfaces. Preferably, the outer surface of the upper wing plate 1 is a curved surface curved towards the lower wing plate 2, and the outer surface of the lower wing plate 2 is a curved surface curved towards the upper wing plate 1, so that the weight of a product can be reduced after the pull tab connecting parts on the outer surfaces of the upper wing plate 2 are removed, the procedure of buckling the pull tab connecting parts can be omitted in the subsequent production and assembly, and the production cost can be greatly reduced; meanwhile, the upper wing plate and the lower wing plate 2 can be directly contacted with a human body, so that the comfort level in use is improved, the abrupt sense of pull tabs is reduced, and after the pull tab link parts on the outer surfaces of the upper wing plate and the lower wing plate 2 are removed, large-area logo, trademark, pattern and the like can be added on the outer surfaces of the upper wing plate and the lower wing plate 2, so that the selling point of a product is improved.

Example 2

Only the differences from the above-described embodiments are described in this embodiment, in which the side of the first upper wing slider 11 near the guide post 3 extends inward in the longitudinal direction of the upper wing plate 1 to 1/4 to 1/2 of the distance from the front end side of the guide post 3;

the side of the first lower wing sliding part 21 near the guide post 3 extends inward in the longitudinal direction of the lower wing plate 2 to 1/4 to 1/2 of the distance from the front end side of the guide post 3.

Example 3

A slide fastener comprising a first fastener tape, a second fastener tape, and a slider for slide fastener for manipulating engagement or disengagement of elements on the first fastener tape and elements on the second fastener tape, characterized in that the slider for slide fastener is the lock-free pull tab described in the above embodiment.

The embodiments of the present utility model are described in detail above. The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the core concepts of the utility model. It should be noted that it will be apparent to those skilled in the art that the present utility model may be modified and adapted without departing from the principles of the present utility model, and that such modifications and adaptations are intended to be within the scope of the appended claims.

Claims (10)

1. The utility model provides a no lock is no pull and is climbed pull head, includes the pull head main part, the pull head main part has upper flange (1) and lower pterygoid lamina (2) of relative parallel to and set up guide post (3) at pull head main part front end side, guide post (3) are used for linking upper flange (1) and lower pterygoid lamina (2), upper flange (1) left and right sides is equipped with deflector (4) towards the direction extension of lower pterygoid lamina (2), upper deflector (4) with form the interlock clearance that is used for interlock fastener strip between lower pterygoid lamina (2), upper flange (1), lower pterygoid lamina (2), upper deflector (4) enclose into and are used for supplying spout (7) that the tooth slided and pass, its characterized in that:

the front end of the upper wing plate (1) is provided with at least two upper wing sliding parts with inner side surfaces in different planes so as to form a ladder structure at the front end of the upper wing plate (1);

the front end of the lower wing plate (2) is provided with at least two lower wing sliding parts with inner side surfaces in different planes so as to form a ladder structure at the front end of the lower wing plate (2);

the height of the inner side surface of the upper wing sliding part close to the front port of the sliding groove (7) is higher than that of the inner side surface of the upper wing sliding part far away from the front port of the sliding groove (7), and the height of the inner side surface of the lower wing sliding part close to the front port of the sliding groove (7) is lower than that of the inner side surface of the lower wing sliding part far away from the front port of the sliding groove (7), so that the height distance formed by the sliding groove (7) at the front port is the largest.

2. The lock-free pull tab slider according to claim 1, wherein the upper wing sliding part includes a first upper wing sliding part (11) provided near a front port of the slide groove (7) and a second upper wing sliding part (12) connected to the first upper wing sliding part (11), and a height of an inner side surface of the first upper wing sliding part (11) is higher than a height of an inner side surface of the second upper wing sliding part (12) in a height direction of the slider, and the first upper wing sliding part (11) extends inward in a length direction of the upper wing plate (1) to not more than a rear end of the guide post (3);

the lower wing sliding part comprises a first lower wing sliding part (21) which is arranged close to the front port of the sliding groove (7) and a second lower wing sliding part (22) which is connected with the first lower wing sliding part (21), the height of the inner side surface of the first lower wing sliding part (21) is lower than that of the inner side surface of the second lower wing sliding part (22) along the height direction of the pull head, and the first lower wing sliding part (21) extends inwards to be not more than the rear end of the guide column (3) along the length direction of the lower wing plate (2).

3. The lock-free pull tab slider as claimed in claim 2, wherein the first upper wing sliding portion (11) extends to a side edge of the upper wing plate (1) in a width direction of the slider body, and the side edge of the first upper wing sliding portion (11) is an arc-shaped edge (8); along the width direction of the slider body, the first lower wing sliding part (21) extends to the side edge of the lower wing plate (2), and the side edge of the first lower wing sliding part (21) is an arc-shaped edge (8).

4. The lock-free pull tab slider as claimed in claim 2, wherein a side of the first upper wing slider (11) close to the guide post (3) extends inward in a length direction of the upper wing plate (1) to 1/5 to 2/3 of a distance from a front end side of the guide post (3);

one side of the first lower wing sliding part (21) close to the guide column (3) extends inwards to a position which is 1/5-2/3 away from the front end side of the guide column (3) along the length direction of the lower wing plate (2).

5. The lock-free pull tab slider according to any one of claims 2 to 4, wherein lengths extending to a rear end side of the slider body at different positions of the first upper wing sliding portion (11) are different along a side of the first upper wing sliding portion (11) near the guide post (3) to a side of the first upper wing sliding portion (11) near a side edge of the upper wing plate (1);

the lengths of the first lower wing sliding parts (21) extending to the rear end side of the slider main body at different positions are different along the side, close to the guide column (3), of the first lower wing sliding parts (21) to the side, close to the side edge of the lower wing plate (2), of the first lower wing sliding parts (21).

6. The lock-free pull tab according to any one of claims 2 to 4, wherein the lengths of the respective regions of the first upper wing slider (11) extending toward the rear end side of the slider body are gradually increased in a direction from a side of the first upper wing slider (11) near the guide post (3) to a side of the first upper wing slider (11) near the side edge of the upper wing plate (1) so that a curved wall (221) curved rearward is formed at a junction of the first upper wing slider (11) and the second upper wing slider (12);

along the direction from one side of the first lower wing sliding part (21) close to the guide post (3) to one side of the first lower wing sliding part (21) close to the side edge of the lower wing plate (2), the length of each region of the first lower wing sliding part (21) extending towards the rear end side of the slider main body is gradually increased, so that an arc-shaped wall (221) bending backwards is formed at the joint of the first lower wing sliding part (21) and the second lower wing sliding part (22).

7. The lock-free pull tab slider as claimed in claim 2, wherein the second upper wing sliding portion (12) extends to a rear end side of the upper wing plate (1) in a longitudinal direction of the upper wing plate (1), the upper guide plate (4) being provided in a partial region of the second upper wing sliding portion (12) near the rear end side of the upper wing plate (1);

the second lower wing sliding part (22) extends to the rear end side of the lower wing plate (2) along the length direction of the lower wing plate (2), and a lower guide strip (5) corresponding to the upper guide plate (4) is arranged in a partial area of the second lower wing sliding part (22) close to the rear end side of the lower wing plate (2).

8. The lock-free pull tab slider according to claim 1, wherein the slide groove (7) has a greater height near the front end side of the slider body than near the rear end side of the slider body in the height direction of the slider body.

9. The lock-free pull tab slider according to claim 1, wherein the outer surface of the upper wing plate (1) and the outer surface of the lower wing plate (2) are both curved surfaces.

10. A slide fastener comprising a first fastener tape, a second fastener tape, and a slider for slide fastener for manipulating the element on the first fastener tape and the element on the second fastener tape to be engaged with or disengaged from each other, characterized in that the slider for slide fastener is the lock-free pull tab as claimed in any one of claims 1 to 9.