Pull handle mounting structure for tool box, and tool box

Abstract

A pull handle mounting structure for a tool box, the pull handle mounting structure comprising a box body (10), a pull handle (20), a fixing plate (30) and a locking device (L), wherein guide slideways (50) are provided between the fixing plate (30) and the rear side wall of the box body (10). The locking device (L) comprises: a locking pin (40) having a locking portion (41), and an elastic member (44), wherein the locking pin (40) can move towards the position of the pull handle (20) until the locking portion (41) thereof forms a locking fit with a corresponding lock fastening position (23) provided on the pull handle (20), and can also move towards the side away from the pull handle (20) to unlock the locking portion (41) of the locking pin (40) from the lock fastening position (23) on the pull handle (20); and the elastic member (44) enables the locking pin (40) to always have a tendency to move towards the position of the lock fastening position (23) of the pull handle (20). Further provided is a tool box which comprises the pull handle mounting structure. The pull handle may be locked reliably, and allows a user to easily apply force to unlock the pull handle.

Description

Tool box pull rod installation structure and tool box Technical Field

[0001] The present invention relates to the technical field of tool boxes, and in particular to a pull rod installation structure of a tool box and the tool box. Background Art

[0002] Toolboxes are often equipped with a pull rod so that users can drag it when carrying it outside. Existing pull rod toolboxes, such as conventional suitcases, have a pull rod device connected to one side of the box body. The pull rod device includes a pull handle, and retractable sleeve pull rods are connected to both ends of the pull handle. The other ends of the two sleeve pull rods extend into the inner surface of one side of the box body and are fixed to the box body. For example, Chinese invention patent CN102754986A (application number CN201210274037.4) discloses such a pull rod toolbox. The lower parts of the two sleeve pull rods of the toolbox are fixed to the inner surface of one side of the box body, protruding from the bottom surface of the box body, causing the bottom surface of the box body to be uneven, affecting the use effect. In order to keep the inside of the box body flat, another way is to fix the sleeve pull rods to the outer surface of one side of the box body, but the fixing bracket and the lower part of the sleeve pull rods are exposed on the outer surface of one side of the box body, affecting its aesthetics. On the other hand, in addition to the above problems, the above-mentioned pull rod device has another disadvantage when used on a tool box: since tool boxes are mostly used to store heavy items such as metal tools, the twisting force generated during the pulling of the box body during use is also relatively large. The telescopic connector of the telescopic sleeve pull rod is often prone to wear and loosening under the action of the large twisting force, resulting in premature damage, which directly affects the service life of the pull rod tool box.

[0003] To this end, Chinese invention patent application CN104209939A (application number 201410447451.X) discloses a drawbar toolbox, which includes a box body and a retractable drawbar device fixed to the bottom of the box body by screws, and the retractable drawbar device includes a guide fixing plate and a drawbar connected to the guide fixing plate. In this patent application, the retractable drawbar device connected to the drawbar toolbox is structurally designed to be flat, parallel to the outer bottom surface of the toolbox box body, firmly connected to the box body, and has an aesthetic appearance. It also maintains the flatness of the inner bottom surface of the toolbox, thereby improving the use effect of the toolbox. At the same time, the drawbar is easy to pull out and insert during use, and can withstand large torsional forces, thereby increasing the service life of the drawbar toolbox. The drawbar toolbox is provided with an opening at the upper end of the guide fixing plate, and the bottom edge of the opening is provided with opening grooves on both sides along the central axis, a stop plate is provided in the middle, and a positioning protrusion and a toggle tongue are provided at the head end of the stop plate. Among them, the pull rod is locked and limited by the toggle tongue set at the head end of the stop plate and the pull rod. Specifically, if the pull rod is to be pulled out from the guide fixing plate of the retractable pull rod device connected to the box body, just use your fingers to push the toggle tongue set at the head end of the stop plate downward to make the positioning protrusion break away from the limiting effect on the pull rod. When the pull rod is pulled out to the position where the positioning through hole set at its lower end is aligned with the position of the positioning protrusion, the elastic reset effect generated by the stop plate pushes the positioning protrusion into the positioning through hole, so that the pull rod is positioned and fixed.

[0004] The toolbox lever mounting structure of the aforementioned patent application also has certain drawbacks. To unlock the lever, the user must pull the lever in a direction perpendicular to the guide plate of the toolbox. Due to the small spacing between the guide plate and the sidewall of the toolbox, there is insufficient operating space, making it inconvenient for the user to apply force, significantly impacting the user experience. Furthermore, the aforementioned locking structure can easily cause deformation of the lever on the guide plate after prolonged use. In severe cases, the positioning protrusion on the plate cannot be effectively reset to the set position, causing the lever to fail to lock.

[0005] Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide a pull rod installation structure for a tool box in view of the current status of the existing technology, which has reliable locking of the pull rod and is convenient for the user to apply force to unlock the pull rod.

[0007] The second technical problem to be solved by the present invention is to provide a tool box using the above-mentioned pull rod installation structure.

[0008] The technical solution adopted by the present invention to solve the first technical problem is: a tool box pull rod installation structure, comprising: a box body; a pull rod; a fixing plate, which is arranged on the rear side wall of the tool box body, and a guide slide is defined between the fixing plate and the rear side wall of the box body for the pull rod to be movably restrained in the upward and downward directions;

[0009] The box further includes a locking device for locking the pull rod relative to the box body and unlocking the lock rod, the locking device including:

[0010] A lock pin is limited on the fixed plate or the rear side wall of the box body or between the fixed plate and the rear side wall of the box body in a manner that can move in the left and right directions. The lock pin has a locking portion. The lock pin can move toward the position of the pull rod until its locking portion forms a locking fit with a corresponding locking position on the pull rod, and can move toward a side away from the pull rod (20) to release the lock between the locking portion of the lock pin and the locking position on the pull rod;

[0011] The elastic member acts on the locking pin and makes the locking pin always have a tendency to move toward the locking position of the pull rod.

[0012] In order to achieve secure limitation of the pull rod and the locking pin in the extension direction of the pull rod, the pull rod has a limiting groove on the side facing the locking pin as the locking position, and the locking pin has a protrusion protruding outward from the main body of the lock pin and adapted to the limiting groove. The protrusion constitutes the locking part of the lock pin.

[0013] In order to facilitate the user to unlock the lock pin, the main body of the lock pin is further provided with a toggle button protruding outward for the user to apply force, and the fixing plate is provided with a clearance opening for the toggle button to be exposed.

[0014] To facilitate the user to pick up the toggle button of the lock pin, when the lock pin and the pull rod are in the locked state, the toggle button is located in the middle position of the clearance opening in the left and right directions; or

[0015] When the locking pin and the pull rod are in a locked state, the toggle button abuts against the edge of the clearance opening, and the fixed plate also has an inwardly recessed clearance area at the edge adjacent to the clearance opening and the toggle button.

[0016] In order to ensure that the pull rod can be firmly maintained in the expanded state and the folded state, the pull rod has an expanded state in which it is extended relative to the box body and a folded state in which it is folded relative to the box body. The pull rod has at least two locking positions arranged in sequence along the extension direction of the pull rod. When the pull rod is in the expanded state and the folded state, it is locked with the locking pin through the locking positions in different positions respectively.

[0017] In order to hide the pull rod in the folded state to avoid damage due to contact with foreign objects, and to facilitate the user to pick up the pull rod in the folded state and pull it out, the end of the pull rod has a handle for the user to hold. When the pull rod is in the folded state, the handle of the pull rod is adjacent to the top wall of the box body, and a picking recessed area facing the inside of the box body is provided on the top wall of the box body corresponding to the handle of the pull rod.

[0018] To form the above-mentioned guide slide, a groove can be formed on the rear side wall of the box or the side wall of the fixed plate according to actual needs. Specifically, the rear side wall of the box is partially recessed into the box to form a first groove extending in the up-down direction, and the cover plate is covered on the first groove of the box, thereby defining the above-mentioned guide slide; or

[0019] The side wall of the fixing plate facing the box body is recorded as the inner wall. The inner wall of the fixing plate also has a second groove that is recessed away from the box body and extends in the up and down directions. The guide slide is formed at the second groove between the fixing plate and the rear side wall of the box body.

[0020] In order to improve the overall strength of the pull rod, the main body of the pull rod is a plate-shaped structure, and a handle for the user to hold is formed at the upper end.

[0021] In order to be compatible with the plate-shaped pull rod, the locking device is located on the left or right side of the pull rod on the fixing plate.

[0022] In order to make the pull rod fit into the second groove provided on the fixed plate, the pull rod includes two vertical rod parts arranged side by side and a horizontal rod part connected between the two vertical rod parts, and the second groove on the inner side wall of the fixed plate has two vertical rod parts arranged side by side in the left and right directions, and the two vertical rod parts of the pull rod are correspondingly slidably limited in the two second grooves; or

[0023] In order to make the pull rod adapt to the first groove provided on the rear side wall of the box body, the pull rod includes two vertical rod parts arranged side by side and a horizontal rod part connected between the two vertical rod parts. The first groove on the rear side wall of the box body has two vertical rod parts arranged side by side in the left and right directions, and the two vertical rod parts of the pull rod are correspondingly slidably limited in the two first grooves.

[0024] In order to rationally utilize the space area between the two vertical rod parts of the pull rod on the rear side wall of the fixed plate or the box body, so that the installation structure of the pull rod is more compact, the locking device is located in the middle area between the two vertical rod parts of the pull rod, and at least one of the two vertical rod parts of the pull rod is provided with the locking position.

[0025] In order to facilitate the user to apply force when unlocking, such as unlocking by simultaneously pushing two locking pins with one hand, the two vertical rods of the pull rod are provided with the aforementioned locking positions on the rear side walls opposite to each other in the left and right directions, and the locking device includes two locking pins arranged in sequence in the left and right directions, and the two locking pins can move in opposite directions in the left and right directions to lock or unlock with the locking positions on the corresponding vertical rods of the pull rod.

[0026] Generally speaking, two elastic members can be provided, that is, corresponding one to one with the two locking pins. However, considering that the space area between the two vertical rod parts of the pull rod is limited, one elastic member can also be used. Specifically, the elastic member is provided between the two locking pins, so that the two locking pins always tend to move away from each other.

[0027] When the second groove for placing the pull rod is provided on the fixed plate, the fixed plate is adapted to have an installation chamber for accommodating the locking pin, and the installation chamber is also provided with a first opening that is connected to the guide slide. The locking portion of the locking pin extends through the first opening into the guide slide to form a locking fit with the locking position of the pull rod.

[0028] Preferably, the inner sidewall of the fixing plate is affixed to the rear sidewall of the box body and has a third groove recessed away from the box body and a cover plate covering the open portion of the third groove, wherein the cover plate and the inner wall of the third groove together define the installation chamber. When assembling the locking device, the locking pin and elastic member can be first installed in the third groove of the fixing plate, and then the cover body is closed, thereby forming an independent unit assembly with the fixing plate. Finally, the unit assembly can be assembled to the rear sidewall of the box body.

[0029] The above-mentioned elastic part can adopt various existing technologies and may include various elastic elements such as compression springs, torsion springs, and spring leaves. However, in order to better cooperate with the above-mentioned lock pin, the elastic part is a spring, and a positioning groove is provided on the main body of the lock pin. The spring is arranged in the positioning groove and rests between the main body of the lock pin and the inner wall of the installation chamber.

[0030] In order to adapt to the pull rod in the first groove on the rear side wall of the box, the locking device also needs to be reasonably arranged on the rear side wall of the box. The rear side wall of the box is provided with two first grooves arranged at intervals in the left and right directions. A boss is formed on the part of the rear side wall of the box corresponding to the part between the two first grooves. A corresponding accommodating chamber is formed on the boss for placing the locking device therein. The accommodating chamber is also provided with a second opening that is connected to the guide slide. The locking part of the locking pin extends through the second opening into the guide slide to form a locking fit with the locking position of the pull rod.

[0031] The technical solution adopted by the present invention to solve the second technical problem is: a tool box, including a box body and a pull rod provided on the box body, the pull rod is connected to the rear side wall of the box body through the above-mentioned pull rod installation structure.

[0032] In order to facilitate the movement of the toolbox, rollers are often provided at the bottom of the toolbox. In order to facilitate the assembly of the rollers and prevent the roller mounting structure from occupying the storage space of the box, the bottom of the fixed plate extends to the position of the bottom wall of the box, and rollers are also provided at the bottom of the fixed plate.

[0033] Compared with the existing technology, the advantages of the present invention are as follows: because the locking pin of the locking device moves in the left-right direction relative to the box body to lock and unlock, that is, the movement direction of the locking pin is substantially parallel to the extension direction of the rear side wall of the box body, the user has sufficient operating space when moving the locking pin, which facilitates the application of force and reduces the effort during the unlocking process. In addition, after the locking pin is moved into place, the locking portion of the locking pin can lock with the locking position on the pull rod, forming a limit in the vertical direction, ensuring the reliable locking of the pull rod. Because the locking pin is provided separately from the fixing plate, the locking effect will not be affected by deformation of the fixing plate even after long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1 is a schematic diagram of the three-dimensional structure of a tool box according to Example 1 of the present invention (the pull rod is in a retracted state);

[0035] FIG2 is a schematic diagram of the three-dimensional structure of the tool box according to Example 1 of the present invention (the pull rod is in an extended state);

[0036] FIG3 is an exploded view of the pull rod mounting structure of the tool box according to embodiment 1 of the present invention;

[0037] FIG4 is a schematic diagram of the three-dimensional structure of the back side of the pull rod mounting structure of the tool box according to Example 1 of the present invention;

[0038] FIG5 is a schematic diagram of the three-dimensional structure of the portion A in FIG4 without the cover plate;

[0039] FIG6 is a schematic diagram of the three-dimensional structure of the pull rod in FIG5 in an extended state;

[0040] FIG7 is a rear view of the tool box according to embodiment 1 of the present invention;

[0041] FIG8 is a cross-sectional view of the section AA in FIG7;

[0042] FIG9 is a schematic diagram of the three-dimensional structure of the tool box according to Example 2 of the present invention (the pull rod is in a retracted state);

[0043] FIG10 is a schematic diagram of the three-dimensional structure of the tool box according to Example 2 of the present invention (the pull rod is in an extended state);

[0044] FIG11 is an exploded view of the pull rod mounting structure of the tool box according to embodiment 2 of the present invention;

[0045] FIG12 is a rear view of the tool box according to embodiment 2 of the present invention;

[0046] FIG13 is a cross-sectional view of the section AA in FIG12;

[0047] FIG14 is a schematic diagram of the three-dimensional structure of the tool box according to Example 3 of the present invention (the pull rod is in a retracted state);

[0048] FIG15 is a schematic diagram of the three-dimensional structure of the tool box according to Example 3 of the present invention (the pull rod is in an extended state);

[0049] FIG16 is an exploded view of the pull rod mounting structure of the tool box of Example 3 of the present invention;

[0050] FIG17 is a rear view of the tool box according to embodiment 3 of the present invention;

[0051] FIG18 is a schematic diagram of the structure of FIG17 without the fixing plate.

[0052] FIG19 is a cross-sectional view taken along line AA in FIG17 . DETAILED DESCRIPTION

[0053] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0054] Example 1

[0055] Figures 1 to 8 show a preferred embodiment of the pull rod mounting structure of the present invention and a toolbox with the pull rod mounting structure. The toolbox includes a box body 10 and a pull rod 20 installed on the rear side wall of the box body 10. The "rear side wall" in the present invention is only defined for the convenience of description based on the accompanying drawings, and it can be understood that it can also be the left and right side walls or the front side wall. Taking the functional use state of the pull rod 20 of the toolbox as a reference, the box body 10 includes a top wall 11 and a bottom wall 12 opposite to each other up and down, and side walls 13 arranged on all sides and extending vertically. When the box body 10 has a cover body, the cover body also constitutes a side wall 13 of the box body 10. The bottom of the box body 10 is generally provided with a roller 14, and the roller 14 can be directly installed on the bottom wall 12 of the box body 10, or it can be installed on the fixing plate 30 of the pull rod mounting structure. A handle is often provided on the top of the box body 10 for conveniently lifting the tool box. Of course, the pull rod 20 of this embodiment can also be used as a handle when it is in the folded state because it is securely locked.

[0056] The pull rod installation structure includes a fixing plate 30 and a locking device L for locking the pull rod 20 relative to the box body 10 . The locking device L includes a locking pin 40 and an elastic member 44 .

[0057] The fixing plate 30 is mounted on the rear side wall 13 of the box body 10 by screws. The fixing plate 30 has an inner side wall 311 facing the rear side wall of the box body 10 and an outer side wall 312 facing away from the box body 10. A guide slide 50 is defined between the inner side wall 311 of the fixing plate 30 and the rear side wall of the box body 10, in which the pull rod 20 is positioned so as to move up and down. Specifically, the outer wall surface of the rear side wall of the box body 10 in this embodiment is a substantially flat planar structure, while the inner side wall 311 of the fixing plate 30 has a second groove 310 that is recessed in a direction away from the box body 10 and extends in the vertical direction. After the fixing plate 30 is mounted on the rear side wall of the box body 10, the above-mentioned guide slide 50 is formed at the second groove 310 between the inner side wall 311 of the fixing plate 30 and the rear side wall of the box body 10. 6 and 8 , the pull rod 20 is a plate-like structure as a whole, with only a handle portion 2220 formed at the upper end for the user to hold, which is adapted to the plate-like structure of the pull rod 20 . The second groove 310 on the fixing plate 30 is also a groove with a relatively wide lateral dimension.

[0058] The inner sidewall 311 of the fixing plate 30 also has an installation chamber 34 for accommodating the locking pin 40 and the elastic member 44. The installation chamber 34 is located adjacent to the top wall 11 of the housing 10. The installation chamber 34 and the guide slide 50 are arranged in sequence in the left-right direction. Specifically, the inner sidewall 311 of the fixing plate 30 has a third groove 340 that is recessed away from the housing 10, and a cover plate 342 that covers the open portion of the third groove 340. The cover plate 342 can be connected to the inner sidewall 311 of the fixing plate 30 by screws. After the cover plate 342 is installed in place, the cover plate 342 and the inner wall of the third groove 340 on the fixing plate 30 together define the installation chamber 34. A first opening 341 is provided on the portion of the fixing plate 30 located between the third groove 340 and the second groove 310. The first opening 341 connects the third groove 340 and the second groove 310. The lock pin 40 has a locking portion 41 adjacent to the first opening 341. Specifically, the locking portion 41 is a protrusion extending outward from the main body of the lock pin 40. The main body of the lock pin 40 is limited in the installation chamber 34 and can move left and right in the installation chamber 34. The pull rod 20 has a limiting groove on the side facing the lock pin 40. The limiting groove constitutes a locking position 23 for the protrusion of the lock pin 40 to be inserted into. Referring to Figures 5 and 6, when the pull rod 20 needs to be locked, the locking portion 41 of the lock pin 40 can be inserted into the limiting groove of the pull rod 20 through the first opening 341, thereby limiting the pull rod 20 in the upper and lower directions relative to the box body 10.

[0059] In this embodiment, the elastic member 44 is a spring. To accommodate the spring, a positioning groove 43 extending left and right is provided on the main body of the locking pin 40, facing the cover plate 342. A portion of the spring is positioned within the positioning groove 43 and abuts against the inner wall of the positioning groove 43. The other portion of the spring is exposed outside the positioning groove 43 and abuts against the inner wall of the mounting chamber 34. To unlock the lock, the user moves the locking pin 40 so that the projection on the locking pin 40 disengages the retaining groove of the pull rod 20. During this process, the spring is compressed and accumulates potential energy. When the external force acting on the locking pin 40 is released, the spring's elastic action automatically resets the locking pin 40, allowing its projection to reenter the retaining groove of the pull rod 20.

[0060] As shown in FIG3 , the locking pin 40 further includes an outwardly protruding toggle button 42 on the side away from the cover plate 342. The toggle button 42 is located in the middle of the locking pin 40 in the left-right direction. Correspondingly, the fixing plate 30 defines a clearance opening 32 through which the toggle button 42 is exposed. The clearance opening 32 is of sufficient size in the left-right direction to facilitate the user's ability to move the locking pin 40 leftward or rightward to its limit position by toggling the toggle button 42, thereby locking and unlocking the pull rod 20. To facilitate access to the toggle button 42 of the locking pin 40, in this embodiment, when the locking pin 40 and the pull rod 20 are locked at the locking position 23, the toggle button 42 of the locking pin 40 is located in the middle of the clearance opening 32 in the left-right direction. This allows a certain gap between the toggle button 42 of the locking pin 40 and the edge of the clearance opening 32, allowing the user's fingers to easily reach into the gap and grasp the toggle button 42 of the locking pin 40.

[0061] Referring to Figure 4 , at least two locking positions 23 are sequentially provided on the side of the pull rod 20 along its extension direction. In this embodiment, there are two locking positions 23. Accordingly, the pull rod 20 has an extended state relative to the box body 10 and a retracted state relative to the box body 10. When the pull rod 20 is in the extended state, the locking pin 40 locks with a corresponding locking position 23 on the pull rod 20. When the pull rod 20 is in the retracted state, the locking pin 40 locks with the other corresponding locking position 23 on the pull rod 20.

[0062] Because the locking pin 40 of the locking device L moves left and right relative to the housing 10 to lock and unlock, that is, the movement direction of the locking pin 40 is substantially parallel to the extension direction of the rear side wall of the housing 10, the user has ample space to move the locking pin 40, making unlocking more labor-saving. Furthermore, after the locking pin 40 is moved into position, the locking portion 41 of the locking pin 40 can lock with the locking portion 23 on the pull rod 20, forming a limit in the vertical direction, ensuring the secure locking of the pull rod 20. Because the locking pin 40 is provided separately from the fixing plate 30, deformation of the fixing plate 30 will not affect its locking effect even after prolonged use.

[0063] Example 2

[0064] Referring to Figures 9-13, this embodiment differs from Example 1 in the structure of the pull rod 20 and the guide rail structure formed between the fixed plate 30 and the rear side wall of the box body 10. Specifically, the pull rod 20 of this embodiment includes two vertical rods 21 arranged side by side and a crossbar 22 connected between the two vertical rods 21. The crossbar 22 of the pull rod 20 also corresponds to the handle portion 2220 of the pull rod 20. The inner side wall 311 of the fixed plate 30 also has two second grooves 310 spaced apart and sized to match the two vertical rods 21 of the pull rod 20. After the fixed plate 30 is installed on the rear side wall of the box body 10, two guide rails are formed between the inner side wall 311 of the fixed plate 30 and the rear side wall of the box body 10 at the locations of the two second grooves 310. The two vertical rods 21 of the pull rod 20 are respectively disposed in the two second grooves 310 for vertical movement.

[0065] Since the pull rod 20 of this embodiment has a U-shaped structure as a whole, the locking device L can be arranged on the fixing plate 30 in the middle area corresponding to the positions of the two vertical rod portions 21 of the pull rod 20. Specifically, a limiting groove is provided on one of the vertical rod portions 21 of the pull rod 20 as a locking position 23. As shown in Figure 11, two limiting grooves are provided on the vertical rod portion 21 of the pull rod 20 along its extension direction. In this way, when the pull rod 20 is in the folded state and the expanded state, the protrusions of the locking pin 40 can be respectively inserted into the limiting grooves at different positions of the pull rod 20.

[0066] The crossbar portion 22 of the pull rod 20 forms a handle portion 2220 for the user to grasp. Generally, in order to hide the pull rod 20 in the folded state and prevent it from being damaged by foreign objects, when the pull rod 20 is in the folded state, the crossbar portion 22 of the pull rod 20 is adjacent to the top wall 11 of the box body 10. To facilitate the user to pick up the pull rod 20 in the folded state and pull it out, a picking-up recess 110 is provided on the top wall 11 of the box body 10, which is adjacent to the crossbar portion 22 of the pull rod 20 and is recessed toward the interior of the box body 10.

[0067] Referring to Figure 13 , compared to Example 1, this embodiment omits the cover plate 342 that covers the opening of the third groove 340 of the fixing plate 30 in Example 1. That is, after the fixing plate 30 is mounted on the rear sidewall of the box body 10, the rear sidewall of the box body 10 covers the opening of the third groove 340 of the fixing plate 30.

[0068] 9 , there are two rollers 14 in this embodiment, and both rollers 14 are disposed at the bottom of the fixing plate 30 .

[0069] Example 3

[0070] Referring to Figures 14-19 , this embodiment differs from Example 1 in the following: the locking device L, the structure of the pull rod 20, and the guide rail structure formed between the fixed plate 30 and the rear side wall of the box body 10. Specifically, the pull rod 20 of this embodiment includes two vertical rods 21 arranged side by side and a crossbar 22 connected between the two vertical rods 21, resulting in an overall U-shape. The crossbar 22 of the pull rod 20 also serves as the handle 2220 of the pull rod 20. A first groove 130, recessed toward the interior of the box body 10, is provided on the rear side wall of the box body 10. Two second grooves 310 are spaced apart on the left and right sides, and their dimensions are compatible with the two vertical rods 21 of the pull rod 20. After the fixed plate 30 is installed on the rear side wall of the box body 10, two guide rails are formed between the inner side wall 311 of the fixed plate 30 and the rear side wall of the box body 10, corresponding to the locations of the two first grooves 130. The two vertical rod portions 21 of the pull rod 20 are respectively disposed in the two first grooves 130 to be movably moved up and down.

[0071] Both vertical rods 21 of the pull rod 20 are provided with retaining grooves that serve as locking positions 23. Specifically, each vertical rod 21 of the pull rod 20 is provided with two retaining grooves. When the pull rod 20 is in the folded state and the extended state, the protrusions of the locking pin 40 can be inserted into the retaining grooves at different positions on the pull rod 20.

[0072] A boss 131 is formed on the rear side wall of the housing 10 at a position corresponding to the portion between the two first grooves 130. A housing chamber 132 is formed on the boss 131 at a position adjacent to the top wall 11 of the housing 10. The locking pin 40 and the elastic member 44 of the locking device L are correspondingly arranged in the housing chamber 132. That is, the locking device L is arranged on the rear side wall of the housing 10 at a position corresponding to the middle area where the two vertical rod portions 21 of the pull rod 20 are located. The locking device L includes two locking pins 40 and an elastic member 44 arranged in sequence in the left and right directions. The elastic member 44 is a spring that presses between the two locking pins 40, causing the two locking pins 40 to have a tendency to move in opposite directions. Second openings 133 that are in communication with the first grooves 130 (i.e., the guide slide 50) are also provided on the left and right sides of the housing chamber 132. The locking portions 41 of the two locking pins 40 are opposite to the two second openings 133. The two locking pins 40 can move in opposite directions in the left-right direction and extend into the first groove 130 through the two second openings 133 to lock or unlock with the locking positions 23 on the corresponding vertical rod portion 21 of the pull rod 20 .

[0073] The locking pin 40 also has an outwardly protruding toggle button 42 on the side facing the fixed plate 30. The toggle button 42 is located in the middle of the locking pin 40 in the left-right direction. Correspondingly, the fixed plate 30 has an opening 32 for the toggle button 42 to be exposed. This opening 32 is large enough in the left-right direction to facilitate the user's ability to move the locking pin 40 leftward or rightward to the extreme position by toggling the toggle button 42, thereby locking and unlocking the pull rod 20. When the locking pin 40 and the locking portion 23 of the pull rod 20 are locked, the toggle button 42 on the locking pin 40 abuts against the edge of the clearance opening 32 near the pull rod 20. To facilitate the user's access to the toggle button 42 of the locking pin 40, the fixed plate 30 also has an inwardly recessed clearance area 33 at the edge adjacent to the clearance opening 32 where the toggle button 42 abuts. This prevents the toggle button 42 on the locking pin 40 from being excessively exposed relative to the outer wall of the fixed plate 30 from the clearance opening 32, thereby preventing damage from being squeezed by foreign objects. In addition, in this embodiment, since the locking device L uses two locking pins 40 arranged in sequence on the left and right, it is also convenient for the user to apply force when unlocking. For example, the two locking pins 40 can be simultaneously toggled toward each other by one hand to achieve unlocking.

[0074] Referring to Figure 14, under normal circumstances, in order to hide the pull rod 20 in the folded state and avoid damage due to contact with foreign objects, when the pull rod 20 is in the folded state, the cross bar portion 22 of the pull rod 20 is adjacent to the top wall 11 of the box body 10. In order to facilitate the user to pick up the pull rod 20 in the folded state and pull it out, a picking recessed area 110 recessed toward the interior of the box body 10 is provided on the top wall 11 of the box body 10 adjacent to the cross bar portion 22 of the pull rod 20.

[0075] In order to ensure the flatness of the side of the box body 10 on which the fixing plate 30 is installed, the outer wall surface of the fixing plate 30 installed on the rear side wall of the box body 10 is substantially flush with the rest of the rear side wall of the box body 10 .

Claims

1. A pull rod installation structure for a tool box, comprising: Box body (10); Tie rod (20); A fixing plate (30) is arranged on the rear side wall of the tool box body (10), and a guide slideway (50) is defined between the fixing plate (30) and the rear side wall of the box body (10) for the pull rod (20) to be movably limited in the upper and lower directions; The invention is characterized in that it also comprises a locking device (L) for locking the pull rod (20) relative to the box body (10) and being unlockable, the locking device (L) comprising: A lock pin (40) is limited on the fixed plate (30) or on the rear side wall of the box body (10) or between the fixed plate (30) and the rear side wall of the box body (10) in a manner that it can move in the left-right direction. The lock pin (40) has a locking portion (41). The lock pin (40) can move toward the position of the pull rod (20) until its locking portion (41) forms a locking fit with a corresponding locking position (23) on the pull rod (20), and can move toward a side away from the pull rod (20) to release the lock between the locking portion (41) of the lock pin (40) and the locking position (23) on the pull rod (20); The elastic member (44) acts on the locking pin (40) and makes the locking pin (40) always have a tendency to move toward the position where the locking position (23) of the pull rod (20) is located.

2. The tool box pull rod installation structure according to claim 1, characterized in that: The pull rod (20) has a limiting groove on one side facing the locking pin (40) as the locking position (23), and the locking pin (40) has a protrusion protruding outward from the main body of the locking pin (40) and matching the limiting groove, and the protrusion constitutes the locking portion (41) of the locking pin (40).

3. The tool box pull rod installation structure according to claim 2, characterized in that: The main body of the lock pin (40) also has a toggle button (42) protruding outwards for a user to apply force, and the fixing plate (30) is provided with a clearance opening (32) for the toggle button (42) to be exposed.

4. The tool box pull rod installation structure according to claim 3, characterized in that: When the locking pin (40) and the locking position (23) of the pull rod (20) are in a locked state, the toggle button (42) is located in the middle of the clearance opening (32) in the left-right direction; or When the locking pin (40) and the locking position (23) of the pull rod (20) are in a locked state, the toggle button (42) abuts against the edge of the clearance opening (32), and the fixed plate (30) also has an inwardly recessed clearance area (33) at the edge position adjacent to the clearance opening (32) where the toggle button (42) abuts.

5. The tool box pull rod installation structure according to claim 1, characterized in that: The pull rod (20) has an extended state in which it is stretched out relative to the box body (10) and a retracted state in which it is retracted relative to the box body (10). The pull rod (20) has at least two locking positions (23) arranged in sequence along the extension direction of the pull rod (20). When the pull rod (20) is in the extended state and the retracted state, it is locked with the locking pin (40) through the locking positions (23) at different positions.

6. The tool box pull rod installation structure according to claim 5, characterized in that: The end of the pull rod (20) has a handle portion (2220) for the user to hold. When the pull rod (20) is in a folded state, the handle portion (2220) of the pull rod (20) is adjacent to the top wall (11) of the box body (10). A picking-up recess (110) recessed toward the interior of the box body (10) is provided at a position on the top wall (11) of the box body (10) corresponding to the handle portion (2220) of the pull rod (20).

7. The tool box pull rod installation structure according to any one of claims 1 to 6, characterized in that: The rear side wall of the box body (10) is partially recessed toward the inside of the box body (10), thereby forming a first groove (130) extending in the up-down direction, and the cover plate (342) covers the first groove (130) of the box body (10), thereby defining the guide slideway (50); or The side wall of the fixing plate (30) facing the box body (10) is referred to as an inner side wall (311), and the inner side wall (311) of the fixing plate (30) also has a second groove (310) which is recessed in a direction away from the box body (10) and extends in an up-down direction, and the guide slideway (50) is formed between the fixing plate (30) and the side wall of the box body (10) at the second groove (310).

8. The tool box pull rod installation structure according to claim 7, characterized in that: The main body of the pull rod (20) is a plate-shaped structure, and a handle portion (2220) is formed at the upper end for the user to hold.

9. The tool box pull rod installation structure according to claim 8, characterized in that: The locking device (L) is located on the left or right side of the position of the pull rod (20) on the fixing plate (30).

10. The tool box pull rod installation structure according to claim 7, characterized in that: The pull rod (20) comprises two vertical rod portions (21) arranged side by side and a horizontal rod portion (22) connected between the two vertical rod portions (21); the inner side wall (311) of the fixing plate (30) has two second grooves (310) arranged side by side in the left-right direction; the two vertical rod portions (21) of the pull rod (20) are correspondingly slidably limited in the two second grooves (310); or The pull rod (20) comprises two vertical rod portions (21) arranged side by side and a horizontal rod portion (22) connected between the two vertical rod portions (21); the first grooves (130) on the rear side wall of the box body (10) have two vertical rod portions (21) arranged side by side in the left-right direction; the two vertical rod portions (21) of the pull rod (20) are correspondingly slidably limited in the two first grooves (130).

11. The tool box pull rod installation structure according to claim 10, characterized in that: The locking device (L) is located in the middle area between the two vertical rods (21) of the pull rod (20), and the locking position (23) is provided on at least one of the two vertical rods (21) of the pull rod (20).

12. The tool box pull rod installation structure according to claim 11, characterized in that: The two vertical rod portions (21) of the pull rod (20) are provided with the locking positions (23) on the side walls opposite to each other in the left-right direction. The locking device (L) comprises two locking pins (40) arranged in sequence in the left-right direction. The two locking pins (40) can move in opposite directions in the left-right direction to lock or unlock with the locking positions (23) on the corresponding vertical rod portions (21) of the pull rod (20).

13. The tool box pull rod installation structure according to claim 12, characterized in that: The elastic member (44) is arranged between the two locking pins (40), so that the two locking pins (40) always tend to move away from each other.

14. The tool box pull rod installation structure according to claim 7, characterized in that: The fixing plate (30) has an installation chamber (34) for accommodating the locking pin (40), and the installation chamber (34) is also provided with a first opening (341) which is in communication with the guide slide (50). The locking portion (41) of the locking pin (40) passes through the first opening (341) and extends into the guide slide (50) to form a locking fit with the locking position (23) of the pull rod (20).

15. The tool box pull rod installation structure according to claim 14, characterized in that: The inner side wall (311) of the fixing plate (30) is attached to the rear side wall of the box body (10), and has a third groove (340) recessed in a direction away from the box body (10) and a cover plate (342) covering the open part of the third groove (340), and the cover plate (342) and the inner wall of the third groove (340) together define the installation chamber (34).

16. The tool box pull rod installation structure according to claim 15, characterized in that: The elastic member (44) is a spring. A positioning groove (43) is provided on the main body of the lock pin (40). The spring is arranged in the positioning groove (43) and abuts between the main body of the lock pin (40) and the inner wall of the installation chamber (34).

17. The tool box pull rod installation structure according to claim 7, characterized in that: The rear side wall of the box body (10) is provided with two first grooves (130) arranged at intervals in the left-right direction, and the portion of the rear side wall of the box body (10) corresponding to the portion between the two first grooves (130) forms a boss (131), and the boss (131) is correspondingly provided with a receiving chamber (132) for placing the locking device (L) therein, and the receiving chamber (132) is also provided with a second opening (133) which is connected with the guide slide (50), and the locking portion (41) of the locking pin (40) passes through the second opening (133) and extends into the guide slide (50) to form a locking fit with the locking position (23) of the pull rod (20).

18. A tool box, comprising a box body (10) and a pull rod (20) arranged on the box body (10), characterized in that: The pull rod (20) is connected to the rear side wall of the box body (10) through the pull rod installation structure of the tool box according to any one of claims 1 to 17.

19. The tool box according to claim 18, characterized in that: The bottom of the fixing plate (30) extends to the position where the bottom wall (12) of the box body (10) is located, and a roller (14) is also provided at the bottom of the fixing plate (30).

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