CN220645570U - Box auto-lock pull rod mechanism - Google Patents

Abstract

The utility model relates to the field of automotive interiors, and discloses a box self-locking pull rod mechanism, wherein the box comprises a storage box, the storage box comprises a box cover and a bottom plate, the box cover is buckled on the bottom plate to form a storage space, the box cover comprises a box cover main body and a shell buckled on the box cover main body, one side of the box cover main body is provided with a handle for controlling the opening and closing of the box cover main body, the box cover main body is also provided with a pull rod mechanism connected with the handle, the pull rod mechanism comprises a long connecting rod and a short connecting rod which are respectively connected with two sides of the handle, the long connecting rod and the short connecting rod are respectively connected with the inner side wall of the box cover main body, and a telescopic mechanism is arranged at the long connecting rod and is positioned at one end of the long connecting rod far away from the handle and connected with the inner side wall of the box cover main body. Through the cooperation of telescopic machanism and long connecting rod, realize long-range tensile closure, solved when the storage tank handle is located one side, the inhomogeneous problem that influences the closure of box atress to guarantee the lid of case lid main part and close stably.

Description

Box auto-lock pull rod mechanism

Technical Field

The utility model relates to the field of automotive interiors, in particular to a box self-locking pull rod mechanism.

Background

The automobile storage box is provided with the handle for opening and closing the edges, the requirements of users on attractiveness and practicability are improved, the handle is arranged on one side of the storage box body, particularly, the handle is arranged on one side close to a driving position, the handle is not arranged in the central position, on one hand, the appearance uniqueness is enhanced, on the other hand, the handle is arranged on one side close to the driving position, so that the automobile storage box meets the homeopathic opening and closing habit of a secondary driving position, and can be conveniently opened and closed by the driving position.

However, when the handle is positioned on one side of the storage box, when the storage box is opened by pulling or pushing back the handle, the handle is positioned on the side part of the storage box, the distances between the handle and the two ends of the storage box are unequal, the stress of the box body is uneven, and the closing delay or the closing unclamping of the far end is easy to occur.

Disclosure of Invention

In order to solve one or more technical problems in the prior art, or at least provide an advantageous choice, the utility model provides a box self-locking pull rod mechanism, which solves the problem that when a storage box handle is positioned at one side, the closing is affected by uneven stress of the box.

According to the technical scheme, the box body comprises a storage box, the storage box comprises a box cover and a bottom plate, the box cover is buckled on the bottom plate to form a storage space, the box cover comprises a box cover main body and a shell buckled on the box cover main body, a handle for controlling the box cover main body to open and close is arranged on one side of the box cover main body, the box cover main body is further provided with a pull rod mechanism connected with the handle, the pull rod mechanism comprises a long connecting rod and a short connecting rod which are respectively connected with two sides of the handle, the long connecting rod and the short connecting rod are respectively connected with the inner side wall of the box cover main body, and a telescopic mechanism is arranged at the long connecting rod and is positioned at one end of the long connecting rod far away from the handle and is connected with the inner side wall of the box cover main body.

In a preferred implementation mode of the box self-locking pull rod mechanism, the telescopic mechanism is provided with a limiting piece, the limiting piece comprises a limiting protrusion and a movable pulling piece connected with the limiting protrusion, the inner side wall of the box cover main body is provided with a clamping part communicated to the bottom plate, and the movable pulling piece moves along the telescopic mechanism in the horizontal direction so that the limiting protrusion is clamped or separated from the clamping part.

In a preferred implementation of the box self-locking pull rod mechanism, the telescopic mechanism is provided with a vacancy cavity, the limiting piece is arranged in the vacancy cavity, and the movable pulling piece and the limiting protruding part are exposed out of the vacancy cavity.

In a preferred implementation of the box self-locking pull rod mechanism, a jaw moving along with the long connecting rod is arranged at one end of the long connecting rod, which is far away from the handle, and the jaw is clamped to the outer wall of the vacancy cavity and moves along the outer wall of the vacancy cavity.

In a preferred implementation mode of the box self-locking pull rod mechanism, an elastic reset piece is fixedly arranged in the empty cavity and is connected with one end, far away from the limiting protrusion, of the limiting piece.

In a preferred implementation mode of the box self-locking pull rod mechanism, a boss is arranged in the vacancy cavity, a clamping part which is in butt joint with the side wall of the limiting bulge is arranged on the telescopic mechanism, a first step surface is arranged on the boss to resist the moving pulling piece, and a second step surface is arranged on the clamping part corresponding to the first step surface to resist the clamping jaw.

In a preferred implementation mode of the box self-locking pull rod mechanism, the clamping part is provided with an inclined table, the inclined table extends along the direction of the inner side wall of the clamping part towards the limiting protrusion to form a guide inclined plane, and when the limiting protrusion is clamped with the clamping part, the extending end part of the guide inclined plane is abutted against the limiting protrusion.

In a preferred implementation of the box self-locking tie rod mechanism, the stop member is provided with a hollow region.

In a preferred implementation mode of the self-locking pull rod mechanism of the box body, the pull handle is provided with an elastic piece, and the elastic piece is pulled to stretch so that the long connecting rod drives the clamping jaw to push the movable pulling piece to be pressed to the first step surface; the handle is loosened, and the elastic piece resets to enable the long connecting rod to drive the clamping jaw to reset to press the second step surface.

In a preferred implementation of the self-locking pull rod mechanism of the case, the housing is provided with an operating opening through which the handle is exposed.

The utility model has the beneficial effects that:

(1) The long connecting rod is used as a pulling piece, the handle is connected with the inner side wall of the box cover main body at the end far away from the handle, the telescopic mechanism plays a role in conversion connection between the long connecting rod and the box cover main body, and the long connecting rod is connected or disconnected with the inner side wall of the box cover main body through the telescopic mechanism. In the prior structure setting, the long connecting rod and the short connecting rod are directly locked with the inner side wall of the box cover main body, because the long connecting rod and the short connecting rod are connected with the handle, when the box cover main body is closed, the distance between the short connecting rod and the handle is short, the stress is small, the locking position of the long connecting rod and the inner side wall of the box cover main body is far away from the handle, the end part of the long connecting rod is inconvenient to be firmly locked with the inner side wall when the box cover main body is closed, the telescopic mechanism is changed along with the stress of the long connecting rod, and stretches out or retracts between the long connecting rod and the inner side wall of the box cover main body, thereby realizing the connection or separation between the inner side wall of the box cover main body and the telescopic mechanism, changing the original conversion effect and the pulling effect into only play, and realizing the conversion effect by the telescopic mechanism, thereby avoiding the problem that the long connecting rod is difficult to realize long-distance stretching due to the fact that the stress is too big when the inner side of the box cover main body is closed, so that the long connecting rod is difficult to be connected with the inner side of the box cover main body, and the box cover main body is difficult to be closed. The telescopic mechanism is matched with the long connecting rod to realize long-distance stretching locking, so that the cover of the box cover main body is ensured to be stable.

(2) The telescopic mechanism is connected with and disconnected from the inner side wall of the box cover main body through the limiting piece. The limiting bulge is matched with the movable pulling piece, and the movable pulling piece drives the limiting bulge connected with the movable pulling piece to move in the horizontal direction in the moving process along the telescopic mechanism, so that the connection state of the limiting bulge and the clamping part is changed. When the case cover main body is buckled, the movable pulling piece horizontally moves towards the inner side wall direction of the case cover main body, and the limiting protrusion is driven to move to the clamping part for clamping, so that the case cover main body and the bottom plate are buckled.

(3) When the handle is loosened, the shifting piece is moved to drive the limiting protrusion to move, so that the limiting protrusion extends out of the vacancy cavity, when the box body is covered, the guiding inclined plane abuts against the limiting protrusion, the limiting protrusion is pressed into the clamping portion, the elastic reset piece connected with the limiting protrusion rebounds, and further abutting and positioning is performed on the limiting protrusion.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:

fig. 1 is a schematic structural view of a case cover and a base plate according to an embodiment of the present utility model.

FIG. 2 is a schematic view of a main body of a case cover according to an embodiment of the utility model;

FIG. 3 is a schematic structural view of a clamping portion according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a pull rod mechanism according to an embodiment of the present utility model;

FIG. 5 is a schematic view of the external structure of the telescopic mechanism according to an embodiment of the present utility model;

FIG. 6 is a schematic view illustrating an internal structure of a telescopic mechanism according to an embodiment of the present utility model;

reference numerals illustrate:

1-a box cover;

11-a case cover main body; 12-a housing, 121-an operation port; 13-handle; 14-pull rod mechanism, 141-long connecting rod, 1411-claw and 142-short connecting rod; 15-telescopic mechanisms, 151-limiting protrusions, 152-movable pulling sheets, 153-vacancy cavities, 154-bosses, 1541-first step surfaces, 155-clamping parts, 1551-second step surfaces and 156-hollow areas; 16-clamping part, 161-inclined table and 1611-guiding inclined plane;

2-a bottom plate.

Detailed Description

In order to more clearly illustrate the general inventive concept, reference will be made in the following detailed description, by way of example, to the accompanying drawings.

In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

It should be noted that in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced in other ways than as described herein, and therefore the scope of the present utility model is not limited by the specific embodiments disclosed below.

In addition, in the description of the present utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. However, it is noted that direct connection indicates that two connected bodies are not connected through a transition structure, but are connected through a connection structure to form a whole. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The scheme adopted is as follows:

1-6, the box is including the storage tank, the storage tank includes case lid 1 and bottom plate 2, case lid 1 lock is in bottom plate 2 in order to form the storing space, case lid 1 includes case lid main part 11 and lock in the shell 12 of case lid main part 11, one side of case lid main part 11 is equipped with the handle 13 that control case lid main part 11 opened and shut, case lid main part 11 still is equipped with the pull rod mechanism 14 of being connected with handle 13, pull rod mechanism 14 includes long connecting rod 141 and the short connecting rod 142 of being connected with the both sides of handle 13 respectively, long connecting rod 141 is connected with the inside wall of case lid main part 11 respectively with short connecting rod 142, long connecting rod 141 department is equipped with telescopic machanism 15, telescopic machanism 15 is located the one end that long connecting rod 141 kept away from handle 13 and is connected with the inside wall of case lid main part 11.

In this scheme, long connecting rod 141 is as the pulling piece, forms the connection with the inside wall of handle 13 and the case lid main part 11 of the more remote one end of handle 13, and telescopic machanism 15 plays the conversion connection effect between long connecting rod 141 and the case lid main part 11, and long connecting rod 141 realizes the connection or disconnection between the inside wall with case lid main part 11 through telescopic machanism 15. In the prior structure setting, the long connecting rod 141 and the short connecting rod 142 are directly locked with the inner side wall of the box cover main body 11, because the long connecting rod 141 and the short connecting rod 142 are connected with the handle 13, when the box cover main body 11 is closed, the distance between the short connecting rod 142 and the handle 13 is short, the stress is small and the locking is easy, but the locking position of the long connecting rod 141 and the inner side wall of the box cover main body 11 is far away from the handle 13, the end part of the long connecting rod 141 is inconvenient to be firmly locked with the inner side wall when the box cover main body 11 is covered, the telescopic mechanism 15 is changed along with the stress of the long connecting rod 141, and the long connecting rod 141 stretches out or retracts between the long connecting rod 141 and the inner side wall of the box cover main body 11, so that the connection or separation between the long connecting rod 141 and the inner side wall of the box cover main body 11 is realized, the long connecting rod 141 is changed into only to have the pulling effect from the original converting effect, and the telescopic mechanism 15 realizes the converting effect, so that when the box cover main body 11 is closed, the long connecting rod 141 is difficult to realize long-distance stretching due to the fact that the stress is too big to be difficult to be connected with the inner side wall of the box cover main body 11, and the side of the box cover main body 11 is difficult to be closed. By the cooperation of the telescopic mechanism 15 and the long connecting rod 141, the long-distance stretching locking is realized, so that the cover of the box cover main body 11 is ensured to be stable.

As shown in fig. 4 and 5, in one embodiment, the telescopic mechanism 15 is provided with a limiting member, the limiting member includes a limiting protrusion 151 and a movable pulling piece 152 connected to the limiting protrusion 151, the inner side wall of the case cover main body 11 is provided with a clamping portion 16 connected to the bottom plate 2, and the movable pulling piece 152 moves along the telescopic mechanism 15 in a horizontal direction to enable the limiting protrusion 151 to be clamped or separated from the clamping portion 16.

The telescopic mechanism 15 is connected to and disconnected from the inner side wall of the box cover main body 11 by a stopper. The limiting protrusion 151 is matched with the movable pulling piece 152, and the movable pulling piece 152 drives the limiting protrusion 151 connected with the movable pulling piece 152 to move in the horizontal direction in the process of moving along the telescopic mechanism 15, so that the connection state of the limiting protrusion 151 and the clamping part 16 is changed. When the case cover main body 11 is buckled, the movable pulling piece 152 moves horizontally towards the direction of the inner side wall of the case cover main body 11, and drives the limiting protrusion 151 to move to the clamping part 16 to be clamped, so that the case cover main body 11 and the bottom plate 2 are buckled.

Preferably, the movable pulling piece 152 and the limiting protrusion 151 are integrally formed, so that assembly errors are avoided, and a stable matching relationship between the movable pulling piece 152 and the limiting protrusion is maintained.

The telescopic mechanism 15 is always connected to the cover main body 11 to limit the movement range of the stopper, and the engagement and disengagement of the stopper projection 151 is a state change with the inner side wall of the cover main body 11.

Further, the telescopic mechanism 15 is provided with a vacancy cavity 153, the limiting piece is installed in the vacancy cavity 153, and the movable pulling piece 152 and the limiting protrusion 151 are partially exposed out of the vacancy cavity 153.

The void cavity 153 provides a mounting space for the stopper on the one hand and limits the movement range of the stopper on the other hand. The movable pulling piece 152 and the limiting protrusion 151 are connected in the vacancy cavity 153, the connection parts are mutually perpendicular, the movable pulling piece 152 extends out of the top and the bottom of the vacancy cavity 153, the limiting protrusion 151 extends out of the side part of the vacancy cavity 153, and the part of the movable pulling piece 152 extending out of the vacancy cavity 153 moves transversely along the top and the bottom of the vacancy cavity 153 to drive the limiting protrusion 151 to change the extending length of the side part, so that the clamping or separating of the limiting protrusion 151 and the clamping part 16 is realized.

Further, the end of the long link 141 remote from the pull handle 13 is provided with a jaw 1411 moving with the long link 141, and the jaw 1411 is engaged to the outer wall of the empty cavity 153 and moves along the outer wall of the empty cavity 153.

The claw 1411 is clamped to the top and the bottom of the vacancy cavity 153, the claw 1411 is contacted with the movable pulling piece 152 in the moving process, when the handle 13 is pulled, the long connecting rod 141 is stressed to pull the claw 1411 to horizontally move along the outer wall of the vacancy cavity 153 in the direction close to the handle 13, and when the claw 1411 moves, the movable pulling piece 152 is pushed to move in the direction close to the handle 13, so that the limiting protrusion 151 is driven to leave the clamping part 16, the limiting protrusion 151 is separated from the clamping part 16, and the separation of the box cover main body 11 and the bottom plate 2 is realized. When the handle 13 is released, the pulling force of the handle 13 on the long connecting rod 141 is gradually reduced, the long connecting rod 141 is gradually restored to the original state, the claw 1411 is retracted to the original position, and no pressing action is exerted on the movable pulling piece 152.

Further, an elastic reset member is fixedly disposed in the vacancy cavity 153, and the elastic reset member is connected with one end of the limiting member away from the limiting protrusion 151.

In this embodiment, the elastic restoring member adopts a spring, when the handle 13 is pulled, the movement of the limiting protrusion 151 compresses the elastic restoring member, when the handle 13 is released, the pressure applied to the elastic restoring member is cancelled, and the elastic restoring member tends to restore to the original state, and the limiting protrusion 151 extends out from the empty cavity 153, so that the limiting protrusion 151 and the clamping portion 16 are clamped when the case cover 1 is closed.

It will be appreciated that the resilient return member may be of other conventional construction or materials, and is not particularly limited.

Further, a boss 154 is provided in the cavity 153, the telescopic mechanism 15 is provided with a clamping portion 155 abutting against a side wall of the limiting boss 151, the boss 154 is provided with a first step surface 1541 for resisting the moving pulling piece 152, and the clamping portion 155 is provided with a second step surface 1551 corresponding to the first step surface 1541 for resisting the claw 1411.

When the handle 13 is pulled, the claw 1411 moves to press the movable pulling piece 152 to the first step surface 1541, the first step surface 1541 resists further movement of the movable pulling piece 152, so that the claw 1411 and the movable pulling piece 152 are prevented from exceeding the movement range and separating from the telescopic mechanism 15; the clamping part 155 cooperates with the vacancy chamber 153 on the one hand to form the centre gripping to the spacing protruding 151 that stretches out vacancy chamber 153, avoids spacing protruding 151 to appear shifting and lead to the block inaccurate, and second step face 1551 forms the fender when jack catch 1411 and removal plectrum 152 reset, avoids jack catch 1411 excessive movement to appear breaking away from or driving the locating part excessive movement to guarantee to carry out the range of movement restriction to it, guarantee that the block of locating part is accurate.

As shown in fig. 3, in one embodiment, the locking portion 16 is provided with a ramp 161, and the ramp 161 is provided with a guide inclined surface 1611 extending along the inner sidewall of the locking portion 16 toward the limiting protrusion 151, and when the limiting protrusion 151 is locked with the locking portion 16, an extending end portion of the guide inclined surface 1611 abuts against the limiting protrusion 151.

When the handle 13 is released, the moving pulling piece 152 drives the limiting protrusion 151 to move, so that the limiting protrusion 151 extends out of the empty space cavity 153, and when the box body is covered, the guide inclined surface 1611 abuts against the limiting protrusion 151, the limiting protrusion 151 is pressed into the clamping portion 16, an elastic reset piece connected with the limiting protrusion 151 rebounds, and further abutting and positioning is formed on the limiting protrusion 151.

In one embodiment, as shown in FIG. 6, the stop member is provided with a hollow region 156. The weight of the limiting piece is reduced, and the movement of the limiting piece is easy to realize.

In one embodiment, the pull handle 13 is provided with an elastic member (not shown in the figure), and the pull handle 13 is pulled, and the elastic member stretches to enable the long connecting rod 141 to drive the claw 1411 to push the movable pulling piece 152 to be pressed against the first step surface 1541; the handle 13 is released, and the elastic member resets to enable the long connecting rod 141 to drive the claw 1411 to reset to press the second step surface 1551.

When pulling handle 13, the elastic component is pressed in handle 13 and tightens up, drives jack catch 1411 to the direction that is close to handle 13 to the pulling force of long connecting rod 141, and when unclamping handle 13, the elastic component resets and makes long railing pulling force eliminate, realizes jack catch 1411 and resets to second step face 1551, and spacing protruding 151 stretches out from vacancy chamber 153, and jack catch 1411 can not influence the block of spacing protruding 151 to the pulling force that the elastic component produced to guarantee the block of case lid 1 and bottom plate 2.

As shown in fig. 1, in one embodiment, the housing 12 is provided with an operation opening 121 through which the handle 13 is exposed. The handle 13 is conveniently operated through the operation port 121.

The shape of the operation port 121 is not particularly limited.

The technical solution protected by the present utility model is not limited to the above embodiments, and it should be noted that, the combination of the technical solution of any one embodiment with the technical solution of the other embodiment or embodiments is within the scope of the present utility model. While the utility model has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the utility model and are intended to be within the scope of the utility model as claimed.

Claims (10)

1. The utility model provides a box auto-lock pull rod mechanism, the box includes the storage tank, the storage tank includes case lid and bottom plate, the case lid lock in the bottom plate is in order to form the storing space, the case lid include the case lid main part with the lock in the shell of case lid main part, its characterized in that, one side of case lid main part is equipped with the control the handle that the case lid main part opened and shut, the case lid main part still be equipped with the pull rod mechanism that the handle is connected, the pull rod mechanism include respectively with long connecting rod and the short connecting rod that the both sides of handle are connected, long connecting rod with the short connecting rod respectively with the inside wall of case lid main part is connected, long connecting rod department is equipped with telescopic machanism, telescopic machanism be located long connecting rod keep away from the one end of handle and with the inside wall of case lid main part is connected.

2. The self-locking pull rod mechanism of claim 1, wherein the telescopic mechanism is provided with a limiting piece, the limiting piece comprises a limiting protrusion and a movable pulling piece connected with the limiting protrusion, the inner side wall of the box cover main body is provided with a clamping part communicated to the bottom plate, and the movable pulling piece moves along the telescopic mechanism in the horizontal direction so that the limiting protrusion is clamped with or separated from the clamping part.

3. The self-locking box pull rod mechanism according to claim 2, wherein the telescopic mechanism is provided with a vacancy cavity, the limiting piece is mounted in the vacancy cavity, and the movable pulling piece and the limiting protruding portion are exposed out of the vacancy cavity.

4. A self-locking pull rod mechanism of claim 3, wherein the end of the long connecting rod away from the pull handle is provided with a claw moving along with the long connecting rod, and the claw is clamped to and moves along the outer wall of the vacancy cavity.

5. A self-locking pull rod mechanism of a box body according to claim 3, wherein an elastic reset piece is fixedly arranged in the cavity of the empty space and is connected with one end of the limiting piece far away from the limiting protrusion.

6. The self-locking pull rod mechanism of claim 4, wherein a boss is arranged in the vacancy cavity, the telescopic mechanism is provided with a clamping part which is abutted against the side wall of the limiting boss, the boss is provided with a first step surface to resist the movable pulling piece, and the clamping part is provided with a second step surface corresponding to the first step surface to resist the clamping jaw.

7. The self-locking pull rod mechanism of claim 2, wherein the clamping portion is provided with an inclined table, the inclined table extends along the inner side wall of the clamping portion towards the direction of the limiting protrusion to form a guide inclined plane, and when the limiting protrusion is clamped with the clamping portion, the extending end portion of the guide inclined plane abuts against the limiting protrusion.

8. The self-locking box pull rod mechanism of claim 2, wherein the limiting member is provided with a hollow area.

9. The self-locking pull rod mechanism of claim 6, wherein the pull handle is provided with an elastic piece, and the elastic piece is pulled to stretch so that the long connecting rod drives the clamping jaw to push the movable pulling piece to be pressed against the first step surface; and loosening the handle, and resetting the elastic piece to enable the long connecting rod to drive the clamping jaw to reset to press the second step surface.

10. The self-locking pull rod mechanism of claim 1, wherein the housing is provided with an operating opening exposing the handle.