Tether structure and portable tethered device

Abstract

The utility model discloses a kind of pull rod structure and portable pull rod equipment, it is related to hand-carrying article technical field, wherein, pull rod structure includes outer tube, inner tube, crossbar and transmission assembly, and positioning rod is arranged in the axial direction of outer tube in outer tube;Inner tube is slidably contained in outer tube;Crossbar is connected with the end of inner tube away from outer tube, and crossbar is equipped with button piece;Transmission assembly includes transmission rod, push rod and limit block contained in inner tube, one end of transmission rod is connected with button piece, and other end is elastically connected with push rod, limit block is elastically connected with inner tube, push rod forms limit strip, limit strip and limit block abut and limit, to make limit block extend inner tube and positioning rod clamping limit;Wherein, when pressing button piece, transmission rod drives push rod to press down, limit strip and limit block are separated, and push rod pushes limit block to move horizontally and is separated with positioning rod.

Description

Technical Field

[0001] This utility model relates to the field of hand-held items technology, and in particular to a pull rod structure and a portable pull rod device. Background Technology

[0002] A telescopic rod is a device that adjusts its length through a mechanical structure, widely used in scenarios requiring portability or high adaptability. In related technologies, the specific structure of a telescopic rod typically includes components such as an outer tube, an inner tube, a positioning rod, a push rod, a connector, a limiting block, a pin, and a spring. In use, pressing the button moves the push rod via a fiberglass cable or other transmission rod. The push rod then pushes the limiting block away from the positioning rod, enabling the inner tube to extend or retract.

[0003] However, since the limiting block is usually supported by only one spring in the horizontal direction, the support strength is insufficient. When the user lifts the equipment connected to the pull rod structure by pulling the crossbar, the crossbar and the inner tube are pulled up quickly at the same time. The limiting block may move horizontally due to sudden force, causing the limiting block to detach from the positioning rod and the inner tube to come out quickly, which may cause the equipment to fall, posing a safety hazard of injuring the user or damaging the product. Utility Model Content

[0004] The main purpose of this utility model is to propose a tie rod structure and a portable tie rod device, which aims to supplement the horizontal support strength of the limit block by the contact and limiting of the limit strip and the limit block. Combined with the elastic connection between the limit block and the inner tube, a double protection is formed, eliminating the safety hazard of the inner tube quickly falling out due to the accidental movement of the limit block.

[0005] To achieve the above objectives, the present invention proposes a tie rod structure comprising: An outer tube, wherein a positioning rod is provided inside the outer tube along the axial direction of the outer tube; An inner tube, which is slidably accommodated within the outer tube; A crossbar is connected to the end of the inner tube away from the outer tube, and the crossbar is equipped with a button. A transmission assembly includes a transmission rod, a push rod, and a limiting block housed within the inner tube. One end of the transmission rod is connected to the button, and the other end is elastically connected to the push rod. The limiting block is elastically connected to the inner tube. The push rod forms a limiting strip, which abuts against the limiting block to limit its movement, causing the limiting block to extend out of the inner tube and engage with the positioning rod for limitation. When the button is pressed, the transmission rod drives the push rod to press down, the limiting strip disengages from the limiting block, and the push rod pushes the limiting block to move horizontally and disengage from the positioning rod.

[0006] This utility model also proposes a portable pull rod device, including the pull rod structure described above. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0008] Figure 1 A schematic diagram of an embodiment of the tie rod structure provided by this utility model; Figure 2 A cross-sectional view of an embodiment of the tie rod structure provided by this utility model; Figure 3 for Figure 2 Enlarged view of section A in the middle; Figure 4 for Figure 2 Enlarged view of section B in the middle; Figure 5 A schematic diagram of a transmission component according to an embodiment of this utility model is provided; Figure 6 A cross-sectional view of an embodiment of the transmission component provided by this utility model; Figure 7 A schematic diagram of a limiting block according to an embodiment of the present invention is provided; Figure 8 A schematic diagram of a connector embodiment provided by this utility model; Figure 9 A schematic diagram of an embodiment of the push rod provided by this utility model.

[0009] Explanation of icon numbers: 100. Pull rod structure; 1. Outer tube; 11. Positioning rod; 111. Slot; 2. Inner tube; 3. Crossbar; 31. Button component; 41. Transmission rod; 42. Push rod; 421. Limiting strip; 421a. Abutting part; 421b. Clearance space; 421c. Slot hole; 422. Guide block; 422a. First guide slope surface; 423. Limiting plate; 424. Slot hole; 425. Limiting part; 43. Limiting block; 431. Guide groove; 431a. Second guide surface; 432. Snap-fit ​​protrusion; 433. Limiting groove; 5. Connector; 51. First mounting groove; 511. Limiting hole; 52. Second mounting groove; 521. Through hole; 522. First limiting post; 53. Second limiting post; 6. First spring; 7. Second spring; 8. First pin; 9. Second pin; 110. Pipe plug.

[0010] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0012] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0013] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0014] This utility model proposes a tie rod structure 100.

[0015] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 as well as Figure 6In one embodiment of this utility model, the pull rod structure 100 includes an outer tube 1, an inner tube 2, a crossbar 3, and a transmission assembly. A positioning rod 11 is provided inside the outer tube 1 along its axial direction. The inner tube 2 is slidably accommodated inside the outer tube 1. The crossbar 3 is connected to the end of the inner tube 2 away from the outer tube 1, and a button 31 is provided on the crossbar 3. The transmission assembly includes a transmission rod 41, a push rod 42, and a limiting block 43 accommodated inside the inner tube 2. One end of the transmission rod 41 is connected to the button 31. The other end is elastically connected to the push rod 42, and the limiting block 43 is elastically connected to the inner tube 2. The push rod 42 forms a limiting strip 421, which abuts against the limiting block 43 to limit the position, so that the limiting block 43 extends out of the inner tube 2 and engages with the positioning rod 11. When the button 31 is pressed, the transmission rod 41 drives the push rod 42 to press down, the limiting strip 421 disengages from the limiting block 43, and the push rod 42 pushes the limiting block 43 to move horizontally and disengage from the positioning rod 11.

[0016] In this technical solution, when the user presses the button 31, the button 31 is subjected to axial pressure and transmits the force to the transmission rod 41 connected to it. The transmission rod 41 moves downward along the axial direction of the inner tube 2. Since the other end of the transmission rod 41 is elastically connected to the push rod 42, the downward action of the transmission rod 41 drives the push rod 42 to move downward along the axial direction of the inner tube 2 simultaneously. At this time, the elastic connecting component between the transmission rod 41 and the push rod 42 is compressed, buffering the impact force during the pressing process. As the push rod 42 presses down, the limiting strip 421 formed on the push rod 42 moves downward synchronously with the push rod 42. The limiting strip 421, which was originally in contact with the limiting block 43, gradually separates from the contact surface of the limiting block 43, releasing the horizontal constraint on the limiting block 43. As the limiting strip 421 disengages, the lower end face of the push rod 42 contacts the force-bearing surface of the limiting block 43 and applies a horizontal pushing force, forcing the limiting block 43 to overcome the elastic connection force with the inner tube 2 and move horizontally into the inner tube 2. The limiting block 43 gradually retracts into the inner tube 2 and eventually disengages from the positioning rod 11 inside the outer tube 1. At this time, the inner tube 2 loses the locking and limiting effect of the positioning rod 11 and the limiting block 43, and can freely extend and retract along the axial direction of the outer tube 1 under the user's pulling or pressing force, realizing the adjustment of the pull rod length.

[0017] When the user releases button 31, the pressing force disappears, and the elastic connecting component between transmission rod 41 and push rod 42 releases elastic potential energy, pushing transmission rod 41 to return to its axial position along the inner tube 2. Transmission rod 41 drives button 31 to move upward synchronously until button 31 returns to its initial unpressed state. As transmission rod 41 and push rod 42 return to their upward position, push rod 42 moves upward synchronously along the inner tube 2. The limiting strip 421 on push rod 42 returns to its original position and gradually approaches limiting block 43. At the same time, the elastic connecting component between limiting block 43 and inner tube 2 also releases elastic potential energy, generating a force that pushes limiting block 43 to move horizontally outward. Under the action of this elastic force, limiting block 43 extends horizontally outward from the inner tube 2. When push rod 42 is fully reset, limit strip 421 re-engages with limit block 43 to form a limit, restricting limit block 43 from moving outward. At this time, the portion of limit block 43 extending out of inner tube 2 precisely engages with positioning rod 11 inside outer tube 1, thus restoring the relative fixation of inner tube 2 and outer tube 1. Throughout the process, under the engagement and limitation of positioning rod 11 and limit block 43, inner tube 2 maintains a stable current extension length and no longer slides arbitrarily.

[0018] This solution supplements the horizontal support strength of the limiting block 43 by the contact limiting strip 421 and the limiting block 43. Combined with the elastic connection between the limiting block 43 and the inner tube 2, it forms double protection, eliminating the safety hazard of the inner tube 2 quickly detaching due to accidental movement of the limiting block 43. At the same time, the elastic connection design and smooth transmission of the transmission component ensure the convenience and stability of the telescopic operation of the pull rod, which not only improves the safety of use but also extends the service life of the components.

[0019] Specifically, the outer tube 1 serves as the basic load-bearing component. Its internal positioning rod 11, arranged axially, provides a locking point for the limiting block 43. Through its cooperation with the limiting block 43, it locks the inner tube 2 after extension and retraction, ensuring that the inner tube 2 maintains a fixed length during use and does not slide arbitrarily. The inner tube 2 is slidably housed within the outer tube 1, serving as the main body for the extension and retraction of the pull rod, undertaking the functions of length adjustment and force transmission. Its sliding fit provides the basis for the extension and retraction characteristics of the pull rod. The crossbar 3 connects to the end of the inner tube 2 furthest from the outer tube 1, serving both as a carrier for the user's grip and providing mounting support for the button 31. The button 31 acts as a trigger component, providing the user with a convenient extension and retraction control interface, initiating the transmission process through a pressing action.

[0020] The transmission assembly is the core component for controlling the extension and retraction of the lever. The transmission rod 41 is housed within the inner tube 2, with one end connected to the button 31 and the other end elastically connected to the push rod 42. Its function is to transmit the pressing force of the button 31 to the push rod 42. When no pressing force is applied to the button 31, the push rod 42 returns to its uncontacted state under the action of the elastic restoring force. Simultaneously, the elastic connection design buffers the impact force during pressing, preventing damage from rigid collisions. The push rod 42, as an intermediate transmission component, forms a limiting strip 421 that abuts against the limiting block 43 for positioning. When button 31 is not pressed, the limiting strip 421, through its contact with the limiting block 43, can restrict the limiting block 43 from moving horizontally even if the user quickly pulls up the inner tube 2. When button 31 is pressed, the limiting strip 421 disengages from the limiting block 43, meaning the limiting block 43 can stably extend out of the inner tube 2 and engage with the positioning rod 11. This solves the problem of insufficient support strength of the limiting block 43 caused by relying on a single spring in traditional technology. The limiting strip 421 and the spring form a double constraint, so even if the user quickly pulls up the inner tube 2, the limiting block 43 will not easily move horizontally due to sudden force. The limiting block 43 is elastically connected to the inner tube 2. Its elastic reset characteristic ensures that it can always remain extended from the inner tube 2 and stably engage with the positioning rod 11 when not pushed by the push rod 42. When the button 31 is pressed, the transmission rod 41 drives the push rod 42 to press down, the limiting strip 421 disengages from the limiting block 43, and the constraint on the limiting block 43 is released. At this time, the push rod 42 pushes the limiting block 43 to move horizontally through the downward pressing force, so that it disengages from the positioning rod 11. The inner tube 2 can then freely extend and retract along the axial direction of the outer tube 1 to achieve length adjustment.

[0021] The transmission rod 41 and the push rod 42 are elastically connected. One option is to have a first end plate with a first positioning post at the end of the transmission rod 41 near the push rod 42, and a second end plate with a second positioning post at the end of the push rod 42 near the transmission rod 41, with a spring fitted onto the first and second positioning posts. Alternatively, the first end plate with a positioning post at the end of the transmission rod 41 near the push rod 42, and a second end plate with a positioning groove at the end of the push rod 42 near the transmission rod 41, with the spring fitted onto the positioning post and confined within the positioning groove. No restriction is placed on either option. The limiting block 43 is elastically connected to the inner tube 2. It can be that a positioning groove is provided on the side of the limiting block 43 facing the inner tube 2, and a positioning post is provided on the side of the inner tube 2 facing the limiting block 43, with the spring sleeved on the positioning post and limited within the positioning groove. Alternatively, positioning grooves can be provided on both the side of the limiting block 43 facing the inner tube 2 and the side of the inner tube 2 facing the limiting block 43, with the spring limited within both grooves. There is no restriction on this. Similarly, the button 31 is elastically connected to the inside of the crossbar 3. When pressed, the button 31 compresses the internal elastic structure, driving the transmission rod 41 to trigger subsequent transmission. When released, the elastic structure releases potential energy, pushing the button. The button 31 automatically resets without additional operation. This elastic connection ensures the timely reset of the button 31 and buffers the impact of pressing, optimizing the operating feel. At the same time, a guide slide can be set inside the inner tube 2, and a guide sleeve can be set on the transmission rod 41. The guide slide and the guide sleeve are slidably connected, providing precise guidance and constraint for the axial movement of the transmission rod 41. This prevents the transmission rod 41 from radially offset or rotating when moving up and down, ensuring that the transmission rod 41 can stably drive the push rod 42 to move. This ensures the precise synchronization of actions such as the transmission of force on the guide slope and the contact and disengagement of the limit strip 421, further improving the smoothness and stability of the transmission component's movement.

[0022] Please see Figure 4 , Figure 5 , Figure 6 as well as Figure 8In one embodiment, the pull rod structure 100 includes a connector 5, which is connected to the end of the inner tube 2 away from the crossbar 3 and closes the port of the inner tube 2; the connector 5 has a first mounting groove 51 and a second mounting groove 52 that are connected to each other; a part of the push rod 42 is movable along its height direction and accommodated in the first mounting groove 51, and is elastically connected to the periphery of the groove opening of the second mounting groove 52; the limiting block 43 is movable along its length direction and accommodated in the second mounting groove 52; one end of the limiting block 43 is elastically connected to the bottom wall of the second mounting groove 52, and the other end is exposed in the groove opening of the second mounting groove 52 and is engaged and limited by the positioning rod 11; the limiting strip 421 can extend into the second mounting groove 52 and abut against the limiting block 43. The core function of connector 5 is to provide a precise mounting carrier and protective barrier for push rod 42 and limit block 43. It connects to the end of inner tube 2 away from crossbar 3 and seals the port of inner tube 2, preventing dust and impurities from entering the inner tube 2 and contaminating the transmission components. At the same time, the integrally formed first mounting groove 51 and second mounting groove 52 clearly define the assembly position of push rod 42 and limit block 43, ensuring that their movement trajectories correspond precisely. The first mounting groove 51 provides movable accommodation space for part of the push rod 42 structure, limiting push rod 42 to move only up and down in the height direction, preventing push rod 42 from deviating and causing transmission failure. The push rod 42 is elastically connected to the periphery of the groove opening of the second mounting groove 52. This elastic connection provides power for the push rod 42 to reset and also buffers the impact force when push rod 42 is pressed down, ensuring the smoothness of transmission. The second mounting groove 52 provides a moving channel for the limiting block 43 along its length. Its groove wall can restrict the moving direction of the limiting block 43 and prevent the limiting block 43 from shifting horizontally. One end of the limiting block 43 is elastically connected to the bottom wall of the second mounting groove 52. This elastic structure can continuously provide an outward pushing force to the limiting block 43, ensuring that the limiting block 43 always remains exposed in the groove opening when not subjected to the push rod 42, and is stably engaged with the positioning rod 11. The limiting strip 421 can extend into the second mounting groove 52 and abut against the limiting block 43. This design makes the constraint effect of the limiting strip 421 more precise. By surrounding and limiting the groove, the limiting strip 421 is prevented from slipping off when it abuts against the limiting block 43. The interconnected design of the first mounting groove 51 and the second mounting groove 52 enables spatial linkage between the movement of the push rod 42 and the movement of the limiting block 43. When the push rod 42 moves down along the first mounting groove 51, the limiting strip 421 can directly extend into the second mounting groove 52 and act on the limiting block 43 without the need for an additional guide structure. The push rod 42 is elastically connected to the periphery of the groove opening of the second mounting groove 52, and the elastic force is used to realize the automatic reset of the push rod 42, replacing the traditional distributed elastic components, simplifying the structure and improving the reset reliability. The limiting block 43 is elastically connected to the bottom wall of the second mounting groove 52, and combined with the length direction limitation of the second mounting groove 52, the horizontal movement of the limiting block 43 is smoother. The continuous action of the elastic force avoids the problem of the limiting block 43 being unable to reset due to jamming.The limiting strip 421 extends into the second mounting groove 52 and abuts against the limiting block 43. The enveloping effect of the groove increases the contact stability between the two. Compared with the abutment without groove constraint, it can effectively resist the radial impact force generated when the user quickly pulls up the inner tube 2, further strengthening the horizontal support strength of the limiting block 43. The sealing and protective function of the connector 5 extends the service life of the transmission component. The positioning function of the first mounting groove 51 and the second mounting groove 52 ensures that the movement of the push rod 42 and the limiting block 43 is accurately matched. The elastic connection structure provides stable power for component reset. The abutment of the limiting strip 421 and the limiting block 43 in the groove makes the constraint more reliable. The setting of the connector 5 not only solves the problem of insufficient support strength of the limiting block 43 and easy accidental movement in the traditional technology, but also reduces the risk of component displacement through groove positioning, making the transmission when pressing the button 31 smoother. At the same time, the integrated design of the connector 5 simplifies the assembly process and improves the overall rigidity and durability of the pull rod structure 100.

[0023] Please see Figure 4 , Figure 5 as well as Figure 6In one embodiment, through holes 521 are provided on both opposite side walls of the second mounting groove 52. The limiting strip 421 passes through one through hole 521 and abuts against the limiting block 43. When the button 31 is pressed, the limiting strip 421 can pass through the other through hole 521 and disengage from the limiting block 43. The core function of the through holes 521 on both side walls of the second mounting groove 52 is to provide a precise insertion channel and movement guide for the limiting strip 421. The top through hole 521 serves as a positioning channel when the limiting strip 421 abuts against the limiting block 43, while the bottom through hole 521 serves as a clearance channel when the limiting strip 421 disengages. The diameter of the through hole 521 is adapted to the size of the limiting strip 421 to form a clearance fit, which not only ensures that the limiting strip 421 can pass through smoothly, but also forms a circumferential constraint on the limiting strip 421 through the hole wall, eliminating the radial offset of the limiting strip 421 during the contact or disengagement process. When the limiting strip 421 passes through the through hole 521 at the top and abuts against the limiting block 43, the hole wall of the through hole 521 provides lateral support for the limiting strip 421, which greatly enhances the bending resistance of the limiting strip 421 and makes the abutment force on the limiting block 43 more uniform. The through hole 521 disperses the force on the limiting strip 421 through the wrapping support, making the constraint of the limiting strip 421 on the limiting block 43 more stable. Even if it is subjected to the impact force generated by the user quickly lifting the inner tube 2, it can maintain the abutment state and prevent the limiting block 43 from moving accidentally. When button 31 is pressed, transmission rod 41 drives push rod 42 to move downward along first mounting groove 51. Limiting strip 421 moves synchronously with push rod 42. At this time, the through hole 521 at the bottom provides a smooth avoidance path for limiting strip 421, allowing limiting strip 421 to smoothly pass through the through hole 521 at the bottom and disengage from limiting block 43. This avoids limiting strip 421 getting stuck or rubbing against the wall of second mounting groove 52 due to lack of avoidance space. The through hole 521 opens up the two side walls of second mounting groove 52, allowing the movement of limiting strip 421 to be unobstructed by the groove wall, ensuring that the downward pressure of push rod 42 can be completely converted into the movement of limiting strip 421, ensuring the continuity of transmission. Limiting strip 421 achieves precise contact and smooth disengagement with limiting block 43 through through hole 521. Combined with the elastic connection between limiting block 43 and bottom wall of second mounting groove 52, the entire transmission process is smoother and the constraint is more reliable. At the same time, the opening of the through hole 521 does not weaken the protective function of the second mounting groove 52, and can still work with the connector 5 to block the intrusion of dust and impurities, so that the safety, stability and durability of the pull rod structure 100 can be further improved.

[0024] Please see Figure 5 , Figure 6 as well as Figure 9In one embodiment, the end of the limiting strip 421 furthest from the push rod 42 has an abutting portion 421a, which abuts against the limiting block 43. The limiting strip 421 and the abutting portion 421a enclose a clearance space 421b, which is used to allow the limiting block 43 to move along its length direction to avoid being pressed when the button 31 is pressed. The core function of the abutting portion 421a is to increase the contact area between the limiting strip 421 and the limiting block 43, and optimize the force transmission effect. Compared with the limiting strip 421 directly contacting the limiting block 43 in a line or point, the abutting portion 421a expands the contact area, evenly distributing the constraint force of the limiting strip 421 on the force-bearing surface of the limiting block 43, avoiding wear or deformation of the limiting block 43 caused by local stress concentration, and improving the stability of the abutment, making the horizontal constraint on the limiting block 43 more reliable. The clearance space 421b formed by the limiting strip 421 and the abutting part 421a provides a dedicated area for the movement of the limiting block 43 when the button 31 is pressed, as the limiting block 43 needs to move inward along its length direction. This avoids interference between the limiting block 43 and the limiting strip 421, ensuring smooth movement. When the button 31 is pressed, the transmission rod 41 drives the push rod 42 to move down along the first mounting groove 51. The limiting strip 421 moves synchronously with the push rod 42 and passes through the through hole 521 on the other side. At this time, the limiting block 43 moves along its length direction under the pushing force of the push rod 42. The clearance space 421b provides an unobstructed channel for the movement of the limiting block 43, avoiding friction or jamming between the limiting block 43 and the limiting strip 421. This ensures that the limiting block 43 can retract smoothly and disengage from the positioning rod 11, making the extension and retraction adjustment of the inner tube 2 smoother. The through hole 521 ensures the directional movement and rigid support of the limiting strip 421, the abutment part 421a optimizes the force transmission between the limiting strip 421 and the limiting block 43, and the clearance space 421b eliminates the interference risk when the limiting block 43 moves. It forms a stable cooperation with the connecting piece 5, the first mounting groove 51, the second mounting groove 52 and other components, which not only improves the safety performance of the pull rod structure 100, but also optimizes the user operation experience, making the extension and retraction control of the pull rod more precise and durable, and further reducing the safety risk of the inner tube 2 accidentally coming out.

[0025] Please see Figure 5 , Figure 6 , Figure 7 as well as Figure 9In one embodiment, a guide block 422 is formed at one end of the push rod 42 near the limiting block 43. The guide block 422 has a first guide surface 422a. The limiting block 43 has a guide groove 431. The guide groove 431 has a second guide surface 431a. The guide block 422 is inserted into the guide groove 431. When the button 31 is pressed, the first guide surface 422a abuts against the second guide surface 431a to drive the limiting block 43 away from the positioning rod 11 and disengage from the positioning rod 11. The core function of the guide block 422 and guide groove 431 is to construct an efficient force transmission and conversion structure. The push rod 42 moves along its height (axial direction), while the limiting block 43 moves along its length (horizontal direction). By matching the inclination angles of the two guide surfaces, the axial downward force of the push rod 42 can be converted into a lateral force that pushes the limiting block 43 to move horizontally, achieving precise conversion of the direction of motion. At the same time, the inclined surface contact reduces force loss, achieving a force-saving transmission effect. The design of the guide block 422 being inserted into the guide groove 431 also provides pre-positioning for the cooperation between the push rod 42 and the limiting block 43, ensuring that the first guide surface 422a and the second guide surface 431a always maintain precise contact, avoiding misalignment during transmission. When the button 31 is not pressed, the guide block 422 is stably inserted into the guide groove 431. The first guide surface 422a and the second guide surface 431a are slightly in contact or not in contact, which does not affect the engagement state between the limiting block 43 and the positioning rod 11, and can further limit the relative position between the push rod 42 and the limiting block 43 through the insertion and engagement, thereby enhancing the overall stability of the structure. When the button 31 is pressed, the transmission rod 41 drives the push rod 42 to move downward along the axial direction of the push rod 42. The guide block 422 moves downward synchronously with the push rod 42. At this time, the first guide surface 422a and the second guide surface 431a are in close contact. The axial pressure of the push rod 42 is decomposed into a lateral component force along the tangent direction of the second guide surface 431a. The direction of this component force is consistent with the horizontal movement direction of the limiting block 43, which can efficiently push the limiting block 43 to overcome the elastic connection force with the bottom wall of the second mounting groove 52 and move away from the positioning rod 11 along the length direction of the limiting block 43. Compared to traditional rigid straight-face pushing, the guide slope reduces pushing resistance through force decomposition, making the movement of the limit block 43 smoother and more stable. This avoids component damage caused by jamming or uneven force distribution, while precisely controlling the movement trajectory of the limit block 43 to ensure it can completely disengage from the positioning rod 11. The abutment part 421a and the through hole 521 ensure stable engagement of the limit block 43 when no force is applied. The inclined surface cooperation between the guide slope block 422 and the guide slope groove 431 optimizes the force transmission efficiency during pressing, while the clearance space 421b provides ample clearance space for the movement of the limit block 43.This solves the problems of high force loss and easy jamming in traditional direct push transmission, making it easier for users to press the button 31 and providing a smoother operating feel. At the same time, the insertion and cooperation between the guide block 422 and the guide groove 431 further improves the matching accuracy of the transmission components, avoiding transmission failure caused by misalignment between the push rod 42 and the limit block 43.

[0026] Please see Figure 5 and Figure 6 In one embodiment, the pull rod structure 100 includes a first spring 6, a first limiting post 522 is formed on the bottom wall of the second mounting groove 52, and a limiting groove 433 is opened on the side of the limiting block 43 facing the bottom wall of the second mounting groove 52. One end of the first spring 6 is accommodated in the limiting groove 433, and the other end is sleeved on the first limiting post 522. The limiting strip 421 has a strip hole 421c, and the first limiting post 522 passes through the strip hole 421c. The core function of the first spring 6 is to provide a stable elastic restoring force for the limiting block 43, ensuring that the limiting block 43 can continue to extend and engage with the positioning rod 11 when it is not pushed by the push rod 42. The first spring 6 achieves precise positioning at both ends by accommodating the limiting groove 433 at one end and sleeved on the first limiting post 522 at the other end, avoiding the first spring 6 from shifting or twisting during the extension and retraction process, and ensuring that the direction of the elastic force is always consistent with the movement direction of the limiting block 43. The cooperation between the first limiting post 522 and the limiting groove 433 not only limits the installation position of the first spring 6, but also provides guidance for the movement of the limiting block 43, preventing the limiting block 43 from tilting when moving horizontally; while the slot 421c of the limiting strip 421 allows the first limiting post 522 to pass through. The length direction of the slot 421c is adapted to the vertical movement trajectory of the limiting strip 421, which not only prevents the first limiting post 522 from blocking the rise and fall of the limiting strip 421, but also indirectly enhances the movement stability of the limiting strip 421 by laterally limiting the first limiting post 522 through the hole wall of the slot 421c. When the button 31 is not pressed, the first spring 6 is in a naturally extended or slightly compressed state. Through the elastic force, it continuously pushes the limiting block 43 to move away from the bottom wall of the second mounting groove 52, so that the limiting block 43 is stably exposed in the groove of the second mounting groove 52 and engaged with the positioning rod 11. Combined with the surface contact constraint of the abutment part 421a, even if subjected to instantaneous impact force, the buffering effect of the first spring 6 can offset part of the stress, further reducing the risk of the limiting block 43 moving accidentally. When the button 31 is pressed, the limiting block 43 moves towards the bottom wall of the second mounting groove 52 under the pushing force of the push rod 42. The first spring 6 is compressed and stores elastic potential energy. When the slot 421c moves down with the limiting strip 421, it provides sufficient clearance space for the first limiting post 522 to avoid interference between the two. After the press is canceled, the first spring 6 releases elastic potential energy and pushes the limiting block 43 to quickly reset. At the same time, the guiding cooperation between the first limiting post 522 and the limiting groove 433 ensures that the limiting block 43 accurately returns to the snap-fit ​​position and re-forms the limiting position with the abutting part 421a of the limiting strip 421.

[0027] Please see Figure 5 and Figure 6 In another embodiment, the pull rod structure 100 includes a second spring 7. A limiting plate 423 is formed at the end of the push rod 42 away from the connecting member 5. A second limiting post 53 is formed at the end of the connecting member 5 near the transmission rod 41. One end of the second spring 7 is sleeved on the second limiting post 53, and the other end is connected to the limiting plate 423. The core function of the second spring 7 is to provide elastic reset power for the push rod 42, while simultaneously buffering the impact force when the button 31 is pressed. The second spring 7 is sleeved on the second limiting post 53, achieving precise positioning at one end, and the other end is connected to the limiting plate 423 of the push rod 42, ensuring that the extension and retraction direction of the second spring 7 is consistent with the lifting and lowering direction of the push rod 42, thus preventing reset failure caused by the offset of the second spring 7. The function of the limiting plate 423 is to increase the contact area between the second spring 7 and the push rod 42, so that the elastic force is evenly transmitted to the push rod 42, while limiting the axial displacement of the second spring 7 and preventing the second spring 7 from falling off the end of the push rod 42. The second limiting post 53 provides a stable installation reference for the second spring 7, enhances the rigidity of the second spring 7 during extension and retraction, and avoids bending deformation. When the button 31 is not pressed, the second spring 7 is in a naturally extended state. The elastic force pushes the limiting plate 423 to drive the push rod 42 to return to its original position, so that the abutting part 421a of the limiting strip 421 is in tight contact with the limiting block 43, ensuring the stability of the limiting structure. When button 31 is pressed, transmission rod 41 drives push rod 42 to move downward, limit plate 423 compresses second spring 7. Second spring 7 buffers the pressing force through elastic deformation, avoiding rigid collision between push rod 42 and connecting piece 5, and stores reset potential energy at the same time. After the press is released, the elastic potential energy of second spring 7 is quickly released, pushing limit plate 423 and push rod 42 to reset upward in sync, driving limit strip 421 to re-extend into second mounting groove 52 and abut against limit block 43. The whole reset process is smooth and efficient, without the need for additional operation.

[0028] The first spring 6 ensures the horizontal reset and pre-tightening of the limiting block 43, while the second spring 7 ensures the axial reset and pressing buffer of the push rod 42. In deep coordination with the original abutment part 421a, clearance space 421b, through hole 521 and other structures, it not only enhances the snap-fit ​​reliability of the limiting block 43 and solves the safety hazard of the inner tube 2 accidentally coming out, but also optimizes the operating feel and reset accuracy of the push rod 42, making the extension and retraction control of the pull rod smoother and less effort.

[0029] Please see Figure 3 , Figure 4 , Figure 5 and Figure 6In one embodiment, the pull rod structure 100 includes a first pin 8. The push rod 42 has a strip hole 424 along its height direction. The first pin 8 passes through the inner tube 2, the connector 5, and the transmission rod 41, and passes through the strip hole 424 to connect the inner tube 2, the connector 5, and the transmission rod 41. The core function of the first pin 8 is to establish a multi-component integrated connection benchmark, and at the same time provide guiding constraints for the movement of the push rod 42. By passing through the inner tube 2, the connector 5, and the transmission rod 41, the first pin 8 axially fixes the three key components to form a unified assembly benchmark, avoiding transmission misalignment caused by relative offset of each component, and ensuring the assembly accuracy of the overall structure. At the same time, the first pin 8 passes through the strip hole 424 of the push rod 42. By using the cooperation between the pin and the strip hole 424, the push rod 42 is limited to moving only along the length direction of the strip hole 424 (i.e., the height direction of the push rod 42), preventing the push rod 42 from radially rotating or horizontally offsetting, and ensuring that the movement trajectory of the push rod 42 is completely consistent with the guiding direction of the first mounting groove 51. The function of the strip-shaped hole 424 is to provide a movement clearance channel for the first pin 8. Its length direction is adapted to the lifting stroke of the push rod 42, which not only meets the stroke requirement of the push rod 42 moving downward when the button 31 is pressed, but also reduces the movement resistance through the clearance fit between the hole 521 wall and the first pin 8, ensuring smooth movement of the push rod 42. The length direction constraint of the strip-shaped hole 424 ensures that the push rod 42 only moves axially, avoiding misalignment between the guide block 422 and the guide groove 431, and disengagement between the first guide surface 422a and the second guide surface 431a due to the push rod 42 offset. This ensures the continuity and accuracy of force transmission. The axial downward pressure of the push rod 42 can be stably converted into the horizontal movement force of the limit block 43 through the guide surface, avoiding transmission failure. At the same time, the first pin 8 firmly connects the inner tube 2, the connecting piece 5 and the transmission rod 41, making the three form a force-bearing unit. The force during pressing can be evenly transmitted, reducing stress concentration in individual components and reducing the risk of component deformation.

[0030] Please see Figure 5 , Figure 6 as well as Figure 9In one embodiment, the push rod 42 forms a limiting part 425, and a limiting hole 511 is formed on one side wall of the first mounting groove 51. The limiting part 425 can abut against the top wall of the limiting hole 511 for limiting. The core function of the limiting part 425 is to provide precise mechanical limiting for the reset stroke of the push rod 42, avoiding excessive upward movement of the push rod 42 which could lead to structural interference or assembly failure. As an integrally formed structure of the push rod 42, the limiting part 425 has stable structural strength. By directly abutting against the top wall of the limiting hole 511, a clear reset endpoint constraint is formed, ensuring that the push rod 42 is in a uniform initial position after each reset, and ensuring the fitting accuracy of the abutting part 421a of the limiting strip 421 with the limiting block 43, and the guide block 422 with the guide groove 431. The function of the limiting hole 511 is to provide a dedicated limiting space for the limiting part 425. Its opening position is precisely matched with the maximum reset stroke of the push rod 42, providing a reliable support surface for the abutment of the limiting part 425, and avoiding direct friction between the limiting part 425 and the wall of the first mounting groove 51 through the structure of the hole 521, thus reducing movement loss. When the button 31 is not pressed, the push rod 42 resets upward under the elastic force of the second spring 7. When the push rod 42 moves to the initial working position, the limiting part 425 of the push rod 42 abuts tightly against the top wall of the limiting hole 511 of the first mounting groove 51, preventing the push rod 42 from moving upward further. This avoids excessive pressure between the abutting part 421a of the limiting strip 421 and the limiting block 43, or hard collision between the guide block 422 and the guide groove 431 due to excessive reset. This protects the surface accuracy of the mating parts and ensures that the abutting pressure between the limiting strip 421 and the limiting block 43 is within a reasonable range, ensuring the stability of the engagement.

[0031] Please see Figure 2 and Figure 4 In one embodiment, the end of the limiting block 43 facing the positioning rod 11 has a snap-fit ​​protrusion 432. The positioning rod 11 has multiple slots 111 spaced apart along its axial direction, and the snap-fit ​​protrusion 432 can snap into any slot 111. The core function of the snap-fit ​​protrusion 432 is to enhance the connection stability between the limiting block 43 and the positioning rod 11 through precise engagement with the slot 111. The snap-fit ​​protrusion 432 is integrally formed with the limiting block 43, possessing sufficient structural strength. Its contour matches the groove shape of the slot 111, forming a surface contact engagement. Compared with traditional planar contact engagement, the contact area is larger and the locking force is stronger, effectively resisting axial tensile force. Multiple slots 111 are spaced axially on the positioning rod 11. The spacing of the slots 111 is designed according to the preset telescopic positions of the pull rod, providing multiple fixed length options for the inner tube 2 to meet the height requirements of different usage scenarios. At the same time, the uniform distribution of the slots 111 along the axial direction of the positioning rod 11 ensures that the force state of the locking protrusion 432 is consistent at different positions, ensuring the smoothness and stability of the adjustment process. This design not only achieves flexible adjustment at multiple positions, but also improves the locking reliability through the interlocking locking structure, making the inner tube 2 more securely fixed and preventing accidental slippage.

[0032] Please see Figure 2 and Figure 4 In another embodiment, the pull rod structure 100 includes a second pin 9 and a pipe plug 110. The pipe plug 110 is connected to the end of the outer tube 1 away from the crossbar 3. The second pin 9 passes through the positioning rod 11, the pipe plug 110, and the outer tube 1 to connect the positioning rod 11, the pipe plug 110, and the outer tube 1. The core function of the pipe plug 110 is to seal the port of the outer tube 1 and provide installation support for the positioning rod 11. The pipe plug 110 is connected to the end of the outer tube 1 away from the crossbar 3, which not only prevents dust and impurities from entering the interior of the outer tube 1 and protects the mating surface between the positioning rod 11 and the inner tube 2, but also provides radial positioning for the positioning rod 11 through its own structural precision, ensuring the coaxiality of the positioning rod 11 and the outer tube 1 and avoiding the positioning rod 11 from shifting and causing jamming failure. At the same time, the pipe plug 110 at the bottom of the outer tube 1 is used to insert into the mounting hole of the equipment to realize the connection between the pull rod structure 100 and the equipment. The function of the second pin 9 is to achieve a rigid connection between the positioning rod 11, the pipe plug 110 and the outer tube 1. The second pin 9 passes through the positioning rod 11, the pipe plug 110 and the outer tube 1 in sequence, fixing the three independent components into a whole, forming a force-bearing community, and preventing the positioning rod 11 from loosening or shifting due to vibration or tension during use. At the same time, the pin connection method has a simple structure, is easy to assemble, and can withstand a large axial force, ensuring the long-term stability of the connection.

[0033] The interlocking of the snap-fit ​​protrusion 432 and the slot 111 securely fixes the inner tube 2 to multiple positions. The connection between the second pin 9 and the pipe plug 110 ensures accurate installation of the positioning rod 11. This, combined with the original limiting part 425 and the first pin 8, solves the problems of easy slippage of the inner tube 2 during snap-fit ​​and the limited adjustment range. The pipe plug 110 and the second pin 9 address the issues of misalignment of the positioning rod 11 and insufficient protection at the outer tube 1 port. When used in combination, the positioning rod 11 is securely installed on the outer tube 1 via the second pin 9 and the pipe plug 110. The slot 111 and the snap-fit ​​protrusion 432 are precisely aligned. Users can smoothly adjust to multiple positions by pressing the button 31. Each position is securely and reliably engaged, improving the flexibility of the pull rod, enhancing structural stability and safety, further reducing the risk of accidental dislodgement of the inner tube 2, and extending the overall service life of the pull rod.

[0034] This utility model also proposes a portable pull rod device, which includes a pull rod structure 100. The specific structure of the pull rod structure 100 is as described in the above embodiments. Since this portable pull rod device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described in detail here. Specifically, the device can be a pull rod speaker, a suitcase, a portable storage cart, etc., and has a wide range of applicable scenarios. Thanks to the optimized design of the pull rod structure 100, the device has a multi-level length adjustment function to adapt to users of different heights and usage needs. The stable cooperation between the snap-fit ​​protrusion 432 and the slot 111 and the multiple limiting structure completely avoid the risk of the device falling due to the accidental dislodgement of the inner tube 2, thus improving the safety of use. The precise assembly and elastic reset design of each component make the pull rod extension and retraction operation smooth and effortless, and convenient for disassembly and maintenance. At the same time, the port protection and rigid connection structure enhance the durability of the device, which can resist the vibration and wear in daily use, taking into account both portability and reliability, and bringing users a stable and convenient user experience.

[0035] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A tie rod structure, characterized in that, include: An outer tube, wherein a positioning rod is provided inside the outer tube along the axial direction of the outer tube; An inner tube, which is slidably accommodated within the outer tube; A crossbar is connected to the end of the inner tube away from the outer tube, and the crossbar is equipped with a button. A transmission assembly includes a transmission rod, a push rod, and a limiting block housed within the inner tube. One end of the transmission rod is connected to the button, and the other end is elastically connected to the push rod. The limiting block is elastically connected to the inner tube. The push rod forms a limiting strip, which abuts against the limiting block to limit its movement, causing the limiting block to extend out of the inner tube and engage with the positioning rod for limitation. When the button is pressed, the transmission rod drives the push rod to press down, the limiting strip disengages from the limiting block, and the push rod pushes the limiting block to move horizontally and disengage from the positioning rod.

2. The tie rod structure as described in claim 1, characterized in that, The pull rod structure includes a connector, which is connected to the end of the inner tube away from the crossbar and closes the port of the inner tube; the connector has a first mounting groove and a second mounting groove that are connected to each other; a portion of the push rod is movable along its height direction and accommodated in the first mounting groove, and is elastically connected to the periphery of the opening of the second mounting groove; the limiting block is movable along its length direction and accommodated in the second mounting groove, one end of the limiting block is elastically connected to the bottom wall of the second mounting groove, and the other end is exposed in the opening of the second mounting groove and engages with the positioning rod for limiting; the limiting strip can extend into the second mounting groove and abut against the limiting block.

3. The tie rod structure as described in claim 2, characterized in that, The second mounting groove has through holes on both opposite side walls. The limiting strip passes through one of the through holes and abuts against the limiting block. When the button is pressed, the limiting strip can pass through the other through hole and disengage from the limiting block.

4. The tie rod structure as described in claim 3, characterized in that, The end of the limiting strip away from the push rod has an abutting portion, which abuts against the limiting block; the limiting strip and the abutting portion enclose a clearance space, which is used to allow the limiting block to move along its length direction to avoid being pressed when the button is pressed.

5. The tie rod structure as described in any one of claims 2 to 4, characterized in that, A guide block is formed at one end of the push rod near the limiting block. The guide block has a first guide surface, the limiting block has a guide groove, and the guide groove has a second guide surface. The guide block is inserted into the guide groove. When the button is pressed, the first guide surface abuts against the second guide surface to move the limiting block away from the positioning rod and disengage from the positioning rod.

6. The tie rod structure as described in any one of claims 2 to 4, characterized in that, The pull rod structure includes a first spring; a first limiting post is formed on the bottom wall of the second mounting groove; a limiting groove is formed on the side of the limiting block facing the bottom wall of the second mounting groove; one end of the first spring is accommodated in the limiting groove, and the other end is sleeved on the first limiting post; the limiting strip has a slot, and the first limiting post passes through the slot; and / or The pull rod structure includes a second spring, a limiting plate is formed at the end of the push rod away from the connector, a second limiting post is formed at the end of the connector near the transmission rod, one end of the second spring is sleeved on the second limiting post, and the other end is connected to the limiting plate.

7. The tie rod structure as described in any one of claims 2 to 4, characterized in that, The pull rod structure includes a first pin, and the push rod has a strip-shaped hole along its height direction. The first pin passes through the inner tube, the connector, and the transmission rod, and passes through the strip-shaped hole to connect the inner tube, the connector, and the transmission rod.

8. The tie rod structure as described in any one of claims 2 to 4, characterized in that, The push rod forms a limiting part, and a limiting hole is opened on one side wall of the first mounting groove. The limiting part can abut against the top wall of the limiting hole for limiting.

9. The tie rod structure as described in any one of claims 1 to 4, characterized in that, The limiting block has a locking protrusion at one end facing the positioning rod, and the positioning rod has multiple locking slots spaced apart along its axial direction, with the locking protrusion capable of engaging with any of the slots; and / or The pull rod structure includes a second pin and a tube plug. The tube plug is connected to the end of the outer tube away from the crossbar. The second pin passes through the positioning rod, the tube plug, and the outer tube to connect the positioning rod, the tube plug, and the outer tube.

10. A portable lever device, characterized in that, Includes the tie rod structure as described in any one of claims 1 to 9.

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