CN210912336U

CN210912336U - Self-locking spring bolt of safety belt

Info

Publication number: CN210912336U
Application number: CN201921545670.6U
Authority: CN
Inventors: 杜恒; 徐俊
Original assignee: Yanfeng Automotive Safety Systems Co Ltd
Current assignee: Yanfeng Automotive Safety Systems Co Ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2020-07-03
Anticipated expiration: 2029-09-18

Abstract

The utility model discloses a safety belt auto-lock spring bolt includes: a tongue body having a horizontal opening through which a webbing passes; a rotation body supported near a horizontal opening of the bolt body and capable of rotating between an initial position and a lock position, the rotation body having a through hole therein, the through hole being opened only from a left side surface and a right side surface of the rotation body; and a reset member disposed within the through hole of the rotator and configured to bias the rotator to an initial position. The self-locking spring bolt of the safety belt can realize the locking function of the belt webbing.

Description

Self-locking spring bolt of safety belt

Technical Field

The disclosure relates to the field of automobile safety, in particular to a self-locking spring bolt of a safety belt.

Background

At present, three-point safety belts are widely used in vehicles, and a slidable bolt is arranged on a braid of the three-point safety belt. When a passenger wears the safety belt, the lock tongue is inserted into the mortise lock, and then the passenger can be restrained on the vehicle seat. The lock tongue divides the webbing into a shoulder belt section for limiting the forward movement of the upper body of the passenger and a waist belt section for limiting the forward movement of the waist of the passenger.

Conventional seat belt latches do not have the ability to lock the webbing and therefore the length of the shoulder and lap belt sections can vary as the occupant's body moves. Under normal vehicle conditions, the webbing can be freely withdrawn from and retracted into the retractor to secure the occupant in a prescribed position. When the vehicle collides and other emergency situations occur, the retractor locks the total length of the webbing due to the inertia mechanism, the waist of the passenger can be displaced greatly, and the waist belt segment of the webbing is stretched, so that the shoulder belt segment is shortened. Shortening of the shoulder strap segment may compress the chest of the passenger, causing injury to the chest of the passenger.

A seat belt latch with a locking function has been developed to reduce injury to the chest of a passenger by limiting mutual movement between a lap belt segment and a shoulder belt segment by applying a locking force to a webbing belt. The lock tongue is provided with a revolving body supported by a rotating shaft, and the revolving body can rotate from an initial position to a locking position to lock the mesh belt and can be reset from the locking position to the initial position through a resetting piece. The existing safety belt lock tongue is characterized in that a reset piece is arranged in a revolving body from the front surface of the revolving body and is shielded by a side cover, or the reset piece is embedded into a plastic-coated part of a lock tongue main body.

However, the use of the shaft as a support or guide for the swivel increases the difficulty of assembly and complexity of the bolt. The front surface of the reset piece is assembled into the revolving body, an additional side cover is needed, and the side cover is easy to loosen from the revolving body when the load applied to the braid is overlarge; and the reset piece is embedded in the plastic-coated part, so that the process difficulty is increased, and the stability of the part is reduced.

SUMMERY OF THE UTILITY MODEL

It is an object of the present disclosure to provide a seat belt deadbolt that overcomes at least one of the deficiencies of the prior art.

The subject technology of the present disclosure is illustrated in accordance with aspects described below. For convenience, various examples of aspects of the subject technology are described as clauses (1, 2, 3, etc.) of the reference numerals. These terms are provided as examples and do not limit the subject technology of the present disclosure.

1. A seat belt deadbolt, wherein the seat belt deadbolt comprises:

a tongue body having a horizontal opening through which a webbing passes;

a rotation body supported near a horizontal opening of the bolt body and capable of rotating between an initial position and a lock position, the rotation body having a through hole therein, the through hole being opened only from a left side surface and a right side surface of the rotation body; and

a reset member disposed within the through-hole of the rotator and configured to bias the rotator to an initial position.

2. The seatbelt self-locking tongue according to clause 1, wherein the tongue main body is provided with a left support portion and a right support portion on left and right sides of the horizontal opening, respectively, and the left support portion and the right support portion are configured to support a rotation body.

3. The seatbelt self-locking tongue according to

clause

1 or 2, wherein the restoring member is provided to pass through the through hole of the left support portion, the through hole of the rotation body, and the through hole of the right support portion.

4. The seatbelt latching tongue of clause 2, wherein the reset piece is substantially linear and the central portion has one or more undulations.

5. The seatbelt self-locking tongue according to clause 4, wherein the height of the wave portion is larger than the height of the through hole of the rotator, and the wave portion is fitted in the through hole of the rotator in a pre-compressed manner.

6. The seatbelt self-locking tongue according to clause 4, wherein one of the end portions of the returning piece has a stopper portion configured to be fitted with a stopper groove on one of the left and right support portions.

7. The seatbelt self-locking tongue of clause 6, wherein the stopper portion is substantially hook-shaped.

8. The safety belt self-locking tongue according to clause 6, wherein the stopper groove is provided on the outer side of the through hole of the one support portion in the horizontal direction.

9. The seatbelt self-locking tongue according to clause 6, wherein the wavy part of the returning member and the stopper part form an angle, and the stopper groove of the one support part and the through hole of the one support part form the same angle.

10. The seatbelt self-locking tongue according to clause 6, wherein the through hole of the one support portion and the through hole of the rotator are identical in shape.

11. The seatbelt latching tongue of clause 2, wherein the rotator is substantially C-shaped and includes an upper curved surface, a lower curved surface, a front surface, a rear surface, and the left and right side surfaces connecting the upper curved surface, the lower curved surface, the front surface and the rear surface.

12. The seatbelt self-locking tongue according to clause 11, wherein the through hole of the rotator is located at a rear side portion of the rotator and is substantially kidney-shaped.

13. The seatbelt self-locking tongue according to clause 12, wherein in a cross section in a front-rear direction, a curvature of an outer contour of the through hole of the rotator is kept substantially the same as a curvature of the upper curved surface of the rotator.

14. The seatbelt self-locking tongue according to clause 11, wherein the through hole of the revolving body is located at a front side portion of the revolving body, and is substantially kidney-shaped having a branch portion at an end portion.

15. The seatbelt self-locking tongue according to clause 14, wherein, in a cross section in the front-rear direction, a curvature of an outer contour of the branch portion of the through hole of the rotator is substantially the same as an upper curved surface of the rotator.

16. The seatbelt self-locking tongue according to clause 11, wherein the left and right support portions are provided with arc-shaped projections projecting inward in a horizontal direction, and the swivel body is supported on and rotatable about the arc-shaped projections.

17. The seatbelt latching tongue of clause 16, wherein the lower curved surface of the rotator abuts the upper surface of the arc-shaped protrusion such that the lower curved surface of the rotator is rotatable about the upper surface of the arc-shaped protrusion between the initial position and the locked position.

18. The seat belt latch bolt of clause 16, wherein the upper curved surface of the rotator and the upper surface of the horizontal opening are in abutment such that the upper curved surface of the rotator is able to slide along the upper surface of the horizontal opening as the rotator rotates about the arcuate projection between the initial position and the locked position.

19. The seat belt self-locking tongue of clause 18, wherein the upper surface of the horizontal opening is convexly curved.

20. The seatbelt latching tongue of clause 16, wherein the swivel body is configured to rotate within a channel formed by an upper surface of the horizontal opening and an upper surface of the arcuate projection.

21. The seatbelt latching tongue of clause 11, wherein the rear surface of the rotator abuts against the seatbelt webbing so that movement of the seatbelt webbing causes the rotator to rotate from the initial position to the locked position.

22. The seatbelt self-locking tongue according to clause 11, wherein a webbing passage through which the seatbelt webbing passes is formed between the front surface of the rotator and the lower surface of the horizontal opening, wherein the front surface of the rotator and the lower surface of the horizontal opening are spaced apart by a distance when the rotator is in the initial position, and the front surface of the rotator and the lower surface of the horizontal opening together clamp the seatbelt webbing when the rotator is in the locked position.

23. The seatbelt latching tongue of clause 22, wherein the front surface of the rotator and/or the lower surface of the horizontal opening is provided with one or more teeth.

24. The seatbelt self-locking tongue according to

clause

1 or 2, wherein the tongue main body, the returning member and the rotator are made of metal.

Additional features and advantages of the disclosed subject technology will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosed subject technology. The advantages of the subject technology of the present disclosure will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the subject technology of the present disclosure as claimed.

Drawings

Various aspects of the disclosure will be better understood upon reading the following detailed description in conjunction with the drawings in which:

fig. 1 is an assembled perspective view of a seat belt deadbolt according to a first embodiment of the present disclosure;

fig. 2 is an exploded perspective view of a seat belt deadbolt according to a first embodiment of the present disclosure;

fig. 3 is a cross-sectional view of the seat belt latch bolt shown in fig. 1 in an initial position;

fig. 4 is a cross-sectional view of the seat belt latching strike shown in fig. 1 in a locked position;

fig. 5 is an enlarged partial view of a limit groove of the seatbelt latching tongue shown in fig. 1;

fig. 6 is a schematic view of an assembly operation of the seatbelt latching tongue shown in fig. 1;

fig. 7 is a cross-sectional view of a seat belt deadbolt in an initial position according to a second embodiment of the present disclosure; and

fig. 8 is a cross-sectional view of the belt latching tongue shown in fig. 7 in a locked position.

Detailed Description

The present disclosure will now be described with reference to the accompanying drawings, which illustrate several embodiments of the disclosure. It should be understood, however, that the present disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, the embodiments described below are intended to provide a more complete disclosure of the present disclosure, and to fully convey the scope of the disclosure to those skilled in the art. It is also to be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

It should be understood that like reference numerals refer to like elements throughout the several views. In the drawings, the size of some of the features may be varied for clarity.

It is to be understood that the terminology used in the description is for the purpose of describing particular embodiments only, and is not intended to be limiting of the disclosure. All terms (including technical and scientific terms) used in the specification have the meaning commonly understood by one of ordinary skill in the art unless otherwise defined. Well-known functions or constructions may not be described in detail for brevity and/or clarity.

As used in this specification, the singular forms "a", "an" and "the" include plural referents unless the content clearly dictates otherwise. The terms "comprising," "including," and "containing" when used in this specification specify the presence of stated features, but do not preclude the presence or addition of one or more other features. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items. The terms "between X and Y" and "between about X and Y" as used in the specification should be construed to include X and Y. The term "between about X and Y" as used herein means "between about X and about Y" and the term "from about X to Y" as used herein means "from about X to about Y".

In the description, when an element is referred to as being "on," "attached" to, "connected" to, "coupled" to, or "contacting" another element, etc., another element may be directly on, attached to, connected to, coupled to, or contacting the other element, or intervening elements may be present. In contrast, when an element is referred to as being "directly on," "directly attached to," directly connected to, "directly coupled to," or "directly contacting" another element, there are no intervening elements present. In the description, one feature is disposed "adjacent" another feature, and may mean that one feature has a portion overlapping with or above or below an adjacent feature.

In the specification, spatial relations such as "upper", "lower", "left", "right", "front", "rear", "high", "low", and the like may explain the relation of one feature to another feature in the drawings. It will be understood that the spatial relationship terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, features originally described as "below" other features may be described as "above" other features when the device in the figures is inverted. The device may also be otherwise oriented (rotated 90 degrees or at other orientations) and the relative spatial relationships may be interpreted accordingly.

Fig. 1 and 2 show an assembled perspective view and an exploded perspective view, respectively, of a seatbelt latching tongue 1 according to a first embodiment of the present disclosure. As shown in the figure, the safety belt self-locking bolt 1 comprises a bolt body 2, and a revolving body 3 and a resetting piece 4 which are arranged on the bolt body 2. The tongue body 2 is slidably connected to the belt webbing 5 and is removably insertable into a belt latch (not shown). The rotation body 3 is rotatably supported on the tongue main body 2 and can rotate from an initial position to a lock position to clamp and lock the webbing 5 together with the tongue main body 2. The returning member 4 is provided in the rotation body 3, and serves to return the rotation body 3 from the lock position to the initial position.

The tongue body 2 includes a lower latch portion 22 and an upper webbing portion 21. The latch portion 22 is connected to the webbing portion 21, and both may be integrally formed. The latch portion 22 projects downward from the webbing portion 21, and is elongated. The latch portion 22 can be inserted into a belt latch so that the belt webbing 5 can restrain the occupant on the vehicle seat.

The webbing portion 21 has a substantially rectangular plate shape, and four corners of the rectangle may have rounded. The webbing portions 21 may have a certain curvature in the vertical direction. The outer convex side of the webbing portion 21 is referred to herein as the front side, and the inner concave side is referred to as the rear side. The base plate 211 of the webbing portion 21 is provided with a horizontal opening 212 through which the webbing 5 is passed. The horizontal opening 212 may be elongated and located approximately at the center of the base plate 211. As shown in fig. 3 and 4, the horizontal opening 212 includes an upper surface 212T, a lower surface 212B, and two side surfaces connecting the upper surface 212T and the lower surface 212B. Upper surface 212T is convexly curved for contacting revolving body 3 and guiding revolving body 3 to slide thereon. The lower surface 212B is substantially flat and opposed to the rotor 3 to form a webbing passage 212C therebetween through which the webbing 5 passes. When the rotor 3 is in the initial position (see fig. 3), the lower surface 212B is spaced apart from the rotor 3 by a distance, the webbing passage 212C is open, and the webbing 5 can move freely therethrough. When the rotation body 3 rotates from the initial position to the lock position (see fig. 4), the webbing passage 212C is closed, and the rotation body 3 and the lower surface 212B sandwich the webbing 5, thereby locking the webbing 5 in place.

Returning to fig. 2, the webbing portion 21 is provided with left and right support portions 213 on both left and right sides of the horizontal opening 212 to rotatably support the rotation body 3 on the tongue main body 2. Each support 213 includes a support main body 214 protruding rearward perpendicular to the base plate 211. The outer side surface of the support main body 214 may be disposed flush with the side surface of the substrate 211 or spaced inward from the side surface of the substrate 211. The inner side surface of the support main body 214 is provided with an arc-shaped protrusion 215 protruding inward in the horizontal direction. The rotator 3 may be supported on the arc-shaped projection 215 and rotate around the arc-shaped projection 215. The inner side surface of the support main body 214 can prevent the rotation body 3 from being displaced in the horizontal direction. Each support 213 is also provided with a horizontal through hole 216 through which the return element 4 passes. In addition, referring to fig. 5, an outer portion of the horizontal through hole 216 of the left support portion 213 is provided with a stopper groove 217 to control the fitting angle of the reset element 4 and to prevent the reset element 4 from being over-fitted to completely protrude into the horizontal through hole 216 of the right support portion 213.

The revolving body 3 is engaged with the tongue main body 2 for holding and locking the webbing 5 in the event of an emergency in the vehicle. As shown in fig. 2, the rotator 3 has a substantially C-shape and includes an upper curved surface 3T, a lower curved surface 3B, a front surface 3F, a rear surface 3R, and two side surfaces 3S connecting the above four surfaces. The lower curved surface 3B rests on the arc-shaped projections 215 of the left and right support portions 213. The lower curved surface 3B is fitted to the upper surface of the arc projection 215 so that the lower curved surface 3B can rotate about the arc projection 215 between the initial position and the lock position. The upper curved surface 3T is fitted to the upper surface 212T of the horizontal opening 212 of the latch body 2 or has the same radius of curvature so that the upper curved surface 3T can slide along the upper surface 212T of the horizontal opening 212 when the lower curved surface 3B rotates about the arc-shaped projection 215 between the initial position and the locked position. That is, the rotation body 3 rotates in the passage formed by the upper surface 212T of the horizontal opening 212 of the bolt body 2 and the upper surface of the arc-shaped projection 215, so that the rotation body 3 can omit the rotation shaft for supporting, and the weight of the parts is reduced.

The rear surface 3R abuts on the webbing 5 so that the movement of the webbing 5 can rotate the rotation body 3 from the initial position to the lock position in the event of an emergency of the vehicle. When the rotator 3 is in the locked position, the front surface 3F can clamp and lock the webbing 5 together with the lower surface 212B of the horizontal opening 212 of the tongue body 2, as shown in fig. 4. In some embodiments, the front surface 3F of the rotator 3 and/or the lower surface 212B of the horizontal opening 212 have one or more teeth that function to increase friction so that slippage does not occur when the webbing 5 is clamped and locked.

The rotator 3 further includes a through hole 31 penetrating both side surfaces 3S thereof for accommodating the restoring member 4. The through hole 31 is opened only on both side surfaces 3S, and is not opened and exposed on the other surface of the rotation body 3. In the cross section along the front-back direction, the curvature of the outer contour of the through hole 31 is substantially the same as the upper curved surface 3T of the rotation body 3, so that the movement locus of the reset piece 4 and the rotation body 3 is kept consistent, which is beneficial for the reset piece 4 to smoothly return to the initial position. The through hole 31 may be located at a rear side portion of the rotator 3. In some embodiments, the through-hole 31 is substantially kidney-shaped.

The returning member 4 serves to hold the rotation body 3 on the bolt body 2 and bias it to the initial position, and to return the rotation body 3 from the locked position to the initial position when the rotation body 3 is in the locked position. As shown in fig. 2, the restoring member 4 has a substantially linear shape. The restoring member 4 has one or more wavy parts 41 at its center, the height of the wavy part 41 being greater than the height of the through hole 31 of the rotation body 3, so that the restoring member 4 can be fitted in the through hole 31 in a pre-compressed manner. The right end of the restoring member 4 is formed in a straight line shape for being inserted into the horizontal through hole 216 of the right support portion 213. The left end portion of the restoring member 4 is inserted into the horizontal through hole 216 of the left support portion 213, and the distal end has a substantially hook-shaped stopper portion 42 for cooperating with the stopper groove 217 of the left support portion 213 to control the fitting angle of the restoring member 4 and to prevent the restoring member 4 from being over-fitted to completely protrude into the horizontal through hole 216 of the right support portion 213.

The stopper portion 42 and the wavy portion 41 are at an angle, and the stopper groove 217 in the left support portion 213 is at the same angle as the horizontal through hole 216. The horizontal through hole 216 of the left support portion 213 is formed in conformity with the through hole 31 of the rotation body 3, thereby facilitating smooth fitting of the wavy portion 41 of the restoring member 4 through the two through holes and controlling the angle of the restoring member 4 after fitting. The stopper groove 217 contacts the terminal surface of the stopper portion 42 of the reset element 4 to prevent the reset element 4 from being over-fitted to completely protrude into the horizontal through hole 216 of the right support portion 213.

As shown in fig. 6, the reset piece 4 passes through the horizontal through hole 216 of the left support part 213 of the latch body 2, the through hole 31 of the rotation body 3, and the horizontal through hole 216 of the right support part 213 of the latch body 2 in this order, thereby fitting the rotation body 3 on the latch body 2 and maintaining the initial position. The horizontal through hole 216 of the right support portion 213 may not only support the restoring member 4 but also facilitate the insertion of a removal tool therein to remove the restoring member 4.

The operation of the seat belt self-locking tongue 1 according to the first embodiment of the present disclosure will be described with reference to fig. 3 and 4. In an emergency such as a vehicle collision, the load applied to the webbing 5 exceeds a predetermined load, and the webbing 5 tends to move from the shoulder belt segment 52 toward the lap belt segment 51 through the webbing passage 212C. The lap belt portion 51 of the webbing 5 is brought into close contact with the rear surface 3R of the rotation body 3 and generates sliding friction, thereby pushing the rotation body 3 to rotate counterclockwise (see arrow a) about the arc-shaped projection 215 of the latch body 2 from the initial position to the lock position against the returning force of the returning member 4.

In the lock position, the webbing passage 212C is closed, and the front surface 3F of the rotation body 3 presses the webbing 5 onto the lower surface 212B of the horizontal opening 212 until deformed, thereby clamping and locking the webbing 5. Thereby, the lap belt segment 51 and the shoulder belt segment 52 of the webbing 5 cannot move relative to each other, so that the displacement of the waist of the passenger is reduced, and the injury to the chest of the passenger is reduced. At this time, the restoring member 4 is in an elastically deformed state.

When the load applied to the webbing 5 is released, the lap belt section 51 of the webbing 5 comes out of contact with the rear surface 3R of the rotation body 3, and the return force of the return member 4 returns the rotation body 3 from the locked position to the initial position. Whereby the front surface 3F of the rotator 3 moves away from the lower surface 212B of the horizontal opening 212 and the webbing passage 212C is opened. The seatbelt webbing 5 is free to move through the webbing passage 212C.

A seatbelt self-locking tongue 1001 according to a second embodiment of the present disclosure will be described below with reference to fig. 7 and 8. Belt latching tongue 1001 will be referred to with the same or similar structure as the belt latching tongue 1 with reference numerals increased by 1000.

As shown in fig. 7 and 8, a belt self-locking tongue 1001 includes a tongue body 1002, and a rotator 1003 and a restoring member 1004 provided on the tongue body 1002. The webbing portion 1021 of the tongue body 1002 is slidably connected to the seatbelt webbing 5, and the latch portion 1022 can be removably inserted into a seatbelt latch (not shown). The lower surface 1003B of the rotator 1003 is rotatably supported on the arc-shaped projection 1215 of the tongue main body 1002, and the upper surface 1003T can slide along the upper surface 1212T of the horizontal opening 1212 of the webbing portion 1021 to rotate from the initial position to the lock position, thereby clamping and locking the webbing 5 together with the lower surface 1212B of the horizontal opening 1212. The returning member 1004 is provided in the through hole 1031 of the rotation body 1003, and serves to return the rotation body 1003 from the locked position to the initial position.

The difference between the belt self-locking tongue 1001 and the belt self-locking tongue 1 is that: the position and shape of the through hole 1031 of the rotation body 1003. The through hole 1031 is located at the front side portion of the latch bolt body 1002, not the rear side portion. The shape of the through hole 1031 is not regular waist shape, compared with the through hole 31 of the belt self-locking bolt 1, a relatively short branch part 1031A forming a certain angle (for example, 15 degrees) with the main waist is added at the end part of the waist shape, the curvature of the outer contour of the branch part 1031A is approximately the same as the upper curved surface 1003T of the rotator 1003, so that the reset piece 1004 is ensured to have enough space compression in the process of rotating the rotator from the initial position to the locking position, the movement track of the reset piece 1004 is ensured to be consistent with the movement track of the rotator 1003, and the clamping stagnation in the movement process is prevented.

In an embodiment, the bolt body, the reset piece and the rotator may be made of metal.

According to the embodiment of the disclosure, a self-locking bolt of a safety belt with a locking function is provided, which can realize the locking function of a safety belt mesh belt.

According to the safety belt self-locking bolt disclosed by the embodiment of the disclosure, the arc-shaped bulge is used for replacing the rotating shaft to support the revolving body, and the safety belt self-locking bolt is simple in structure and convenient to process and assemble.

According to the safety belt self-locking spring bolt disclosed by the embodiment of the disclosure, the reset piece is arranged in the revolving body from the side surface, and a side cover is omitted, so that the number of parts is reduced, the weight of a product is reduced, the safety belt self-locking spring bolt is convenient to process and assemble, and the product has market competitiveness in the like products.

Although exemplary embodiments of the present disclosure have been described, it will be understood by those skilled in the art that various changes and modifications can be made to the exemplary embodiments of the present disclosure without substantially departing from the spirit and scope of the present disclosure. Accordingly, all changes and modifications are intended to be included within the scope of the present disclosure as defined in the appended claims. The disclosure is defined by the following claims, with equivalents of the claims to be included therein.

Claims

1. A seat belt latch bolt, the seat belt latch bolt comprising:

a tongue body having a horizontal opening through which a webbing passes;

2. The seatbelt self-locking tongue according to claim 1, wherein the tongue body is provided with a left support portion and a right support portion on left and right sides of the horizontal opening, respectively, and the left support portion and the right support portion are configured to support a rotation body.

3. The seatbelt buckle latch tongue according to claim 1 or 2, wherein the restoring member is provided to pass through the through hole of the left support portion, the through hole of the rotation body, and the through hole of the right support portion.

4. The seatbelt buckle latch tongue of claim 2, wherein the reset member is substantially linear and the central portion has one or more undulations.

5. The seatbelt buckle latch tongue according to claim 4, wherein the height of the wave portion is larger than the height of the through hole of the rotator, and the wave portion is fitted in the through hole of the rotator in a pre-compressed manner.

6. The seatbelt buckle latch tongue of claim 4, wherein one of the ends of the reset piece has a stopper portion configured to engage with a stopper groove on one of the left and right support portions.

7. The seatbelt buckle latch tongue of claim 6, wherein the limiting portion is substantially hook-shaped.

8. The safety belt self-locking tongue as claimed in claim 6, wherein the stopper groove is provided at a horizontal outer side of the through hole of the one support part.

9. The seatbelt buckle latch tongue according to claim 6, wherein the wave portion of the returning member and the stopper portion form an angle, and the stopper groove of the one support portion and the through hole of the one support portion form the same angle.

10. The seatbelt buckle latch tongue of claim 6, wherein the through hole of the one support portion and the through hole of the rotator are identical in shape.

11. The seatbelt buckle latch tongue of claim 2, wherein the body of revolution is generally C-shaped and includes an upper curved surface, a lower curved surface, a front surface, a rear surface, and the left and right side surfaces connecting the upper curved surface, the lower curved surface, the front surface and the rear surface.

12. The seatbelt buckle latch tongue of claim 11, wherein the through hole of the rotator is located at a rear side portion of the rotator and is substantially kidney-shaped.

13. The seatbelt buckle latch tongue according to claim 12, wherein in a cross section in a front-rear direction, a curvature of an outer contour of the through hole of the rotator is kept substantially the same as a curvature of the upper curved surface of the rotator.

14. The seatbelt buckle latch tongue of claim 11, wherein the through hole of the rotator is located at a front side portion of the rotator and has a substantially kidney shape having a branched portion at an end thereof.

15. The seatbelt buckle latch tongue according to claim 14, wherein in a cross section in a front-rear direction, a curvature of an outer contour of the branch portion of the through hole of the revolving body is substantially the same as an upper curved surface of the revolving body.

16. The seatbelt buckle latch tongue according to claim 11, wherein the left and right support portions are provided with arc-shaped projections projecting inward in a horizontal direction, and the swivel body is supported on and rotatable about the arc-shaped projections.

17. The belt latch according to claim 16, wherein the lower curved surface of the rotator abuts the upper surface of the arc-shaped protrusion, so that the lower curved surface of the rotator can rotate around the upper surface of the arc-shaped protrusion between the initial position and the locked position.

18. The seatbelt latching tongue of claim 16, wherein the upper curved surface of the rotator abuts the upper surface of the horizontal opening such that the upper curved surface of the rotator is slidable along the upper surface of the horizontal opening when the rotator rotates about the arcuate projection between the initial position and the locked position.

19. The belt latch according to claim 18, wherein the upper surface of the horizontal opening is convexly curved.

20. The seatbelt latching tongue of claim 16, wherein the swivel body is configured to rotate within a channel formed by an upper surface of the horizontal opening and an upper surface of the arcuate projection.

21. The belt latch according to claim 11, wherein the rear surface of the rotator abuts against the webbing so that movement of the webbing causes the rotator to rotate from the initial position to the locked position.

22. The seatbelt buckle latch tongue of claim 11, wherein a webbing passage through which the seatbelt webbing passes is formed between the front surface of the rotator and the lower surface of the horizontal opening, wherein the front surface of the rotator and the lower surface of the horizontal opening are spaced apart by a distance when the rotator is in the initial position, and the front surface of the rotator and the lower surface of the horizontal opening together clamp the seatbelt webbing when the rotator is in the locked position.

23. The seatbelt latching tongue of claim 22, wherein the front surface of the rotator and/or the lower surface of the horizontal opening is provided with one or more teeth.

24. The seatbelt self-locking tongue according to claim 1 or 2, wherein the tongue main body, the returning member and the rotator are made of metal.