Retractable support leg of child safety seat

Abstract

This utility model discloses a retractable support leg for a child safety seat, including an outer tube, an inner tube, a fixing cover, and a locking mechanism. The upper end of the inner tube extends into the outer tube, and the fixing cover is installed at the lower end of the outer tube. The inner wall of the outer tube has a positioning groove, and the inner wall of the inner tube has multiple shift grooves arranged along its length. The locking mechanism includes a first adjustment button and a locking piece. The fixing cover provides a mounting cavity for accommodating the locking mechanism. The locking piece is inserted into the positioning groove on the inner wall of the outer tube. The first adjustment button includes an integrated button part and an actuating part, with at least a portion of the button part protruding from the outer wall of the fixing cover. The locking piece is connected to the actuating part through a drive assembly, and the actuating part moves linearly to drive the locking piece into or out of the shift groove. This achieves locking or unlocking of the inner tube relative to the outer tube. The mechanism is easy to operate, has a reliable structure, and can adapt to various usage scenarios, providing strong protection for children's safety while traveling in vehicles.

Description

Technical Field

[0001] This utility model relates to a child safety seat, and more particularly to a retractable support leg for a child safety seat. Background Technology

[0002] To ensure children's safety while traveling in vehicles, child safety seats are widely used in daily travel. A child safety seat consists of a seat body and a base for mounting the seat. The rear of the base usually has an ISOFIX assembly, which is connected to the ISOFIX connectors on the car seat to secure the child safety seat.

[0003] However, considering the enormous forces exerted on child safety seats due to inertia during collisions or sudden deceleration at high speeds, support legs are added to the base to support the car's floor. Due to variations in vehicle size and seat height, these support legs are typically designed to be extendable.

[0004] CN113352965B describes a telescopic support leg and child safety seat with a shift mechanism, comprising an outer tube and an inner tube. The outer tube has a mounting groove for accommodating an actuator and a shift pin. The press-on end of the actuator has an operable button, which protrudes from the outer surface of the cover. The button is located inside the support leg, making operation somewhat inconvenient, and the actuator mechanism is relatively complex. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a retractable support leg for a child safety seat that is easy to operate and has a simple mechanism.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a retractable support leg for a child safety seat, including an outer tube, an inner tube, a fixing cover and a locking mechanism; the upper end of the inner tube extends into the outer tube, and the fixing cover is installed at the lower end of the outer tube; the inner wall of the outer tube is provided with a positioning groove, and the inner wall of the inner tube is provided with multiple positioning grooves arranged in the length direction.

[0007] The locking mechanism includes a first adjustment button and a locking piece; the fixing cover provides a mounting cavity for accommodating the locking mechanism; the first adjustment button includes an integral button part and an actuating part, the actuating part includes two support walls forming the receiving cavity, and the two support walls are provided with a pair of inclined grooves; the locking piece is provided with a through hole in the middle, the locking piece is placed in the receiving cavity, the two ends of a shaft are located on the pair of inclined grooves, and the middle of the shaft passes through the through hole of the locking piece;

[0008] The mounting cavity of the fixing cover includes a side cavity located outside the side wall of the outer tube and an inner cavity located outside the inner wall of the outer tube. The button part is located in the side cavity and its outer end protrudes from the fixing cover. The actuating part is located in the inner cavity.

[0009] The first adjustment button can control the locking piece to switch between a first position and a second position; in the first position, the locking piece passes through the positioning groove of the outer tube and enters any position groove of the inner tube, and the position of the inner tube is locked; in the second position, the locking piece exits the position groove of the inner tube, and the inner tube can extend and retract relative to the outer tube.

[0010] A further preferred embodiment of this utility model is that a first spring is disposed between the first adjustment button and the fixed cover.

[0011] A further preferred embodiment of this utility model is that the first adjustment button is located on the first side of the fixed cover;

[0012] A second adjustment button is provided on the second side of the fixed cover, and a second spring is configured to allow the second adjustment button to be pressed.

[0013] A further preferred embodiment of this utility model is as follows: the fixing cover includes a front shell and a rear cover; the front shell and the rear cover are fixed to each other by a screw assembly;

[0014] The front shell is fixed to the inner wall of the outer tube by pins.

[0015] A further preferred embodiment of this utility model is that both the outer tube and the inner tube are square tubes.

[0016] A further preferred embodiment of this utility model is: the bottom of the inner tube is provided with a positioning display device;

[0017] The display device includes a mounting housing, a movable bracket, an elastic element, and two indicator plates with different indication contents;

[0018] The mounting housing includes a top cover and a housing, the movable bracket is movably mounted inside the housing, and the elastic element is provided between the top cover and the movable bracket;

[0019] The movable support is provided with an indicator arm on its side, and two indicator plates are installed on the indicator arm in a vertically distributed manner.

[0020] The housing has a viewing slot on its side, through which at least one indicator piece on the movable support indicator arm is exposed.

[0021] Another preferred subject: a retractable support leg for a child safety seat, comprising an outer tube, an inner tube, a fixing cover, and a locking mechanism; the upper end of the inner tube extends into the outer tube, and the fixing cover is installed at the lower end of the outer tube; the inner wall of the outer tube is provided with a positioning groove, and the inner wall of the inner tube is provided with multiple positioning grooves arranged in the length direction;

[0022] The locking mechanism includes a first adjustment button and a locking piece; the fixing cover provides a mounting cavity for accommodating the locking mechanism; the locking piece is inserted into a positioning groove on the inner wall of the outer tube;

[0023] The first adjustment button includes an integral button part and an actuation part, with at least a portion of the button part protruding from the outer wall of the fixed cover;

[0024] The locking piece is connected to the actuator via a drive assembly. The actuator moves linearly to drive the locking piece into or out of the gear slot, thereby locking or unlocking the inner tube relative to the outer tube.

[0025] A further preferred embodiment of this utility model is: the drive assembly includes an inclined groove and a shaft formed on the support wall of the actuator;

[0026] The actuator includes two support walls to form a receiving cavity, and a pair of inclined grooves are provided on the two support walls; a through hole is provided in the middle of the locking piece, the locking piece is placed in the receiving cavity, the two ends of the shaft are located on the pair of inclined grooves, and the middle of the shaft passes through the through hole of the locking piece;

[0027] The mounting cavity of the fixing cover includes a side cavity located outside the side wall of the outer tube and an inner cavity located outside the inner wall of the outer tube. The button part is located in the side cavity and its outer end protrudes from the fixing cover. The actuating part is located in the inner cavity.

[0028] The first adjustment button can control the locking piece to switch between a first position and a second position; in the first position, the locking piece passes through the positioning groove of the outer tube and enters any position groove of the inner tube, and the position of the inner tube is locked; in the second position, the locking piece exits the position groove of the inner tube, and the inner tube can extend and retract relative to the outer tube.

[0029] A first spring is provided between the first adjustment button and the fixed cover, and the first adjustment button is located on the first side of the fixed cover.

[0030] A further preferred embodiment of this invention is: a second adjustment button is provided on the second side of the fixed cover, and a second spring is provided to enable the second adjustment button to be pressed.

[0031] A further preferred technical solution of this utility model is: the bottom of the inner tube is provided with a positioning display device, the display device including a mounting shell, a movable bracket, an elastic element and two indicator pieces with different indication contents;

[0032] The mounting housing includes a top cover and a housing, the movable bracket is movably mounted inside the housing, and the elastic element is provided between the top cover and the movable bracket;

[0033] The movable support is provided with an indicator arm on its side, and two indicator plates are installed on the indicator arm in a vertically distributed manner.

[0034] The housing has a viewing slot on its side so that at least one indicator piece on the movable support indicator arm can be exposed from the viewing slot;

[0035] When the bottom of the inner tube is supported to the car floor, the movable bracket of the display device moves upward to compress the elastic element, and the indicator piece displaying the red mark is exposed in the viewing slot.

[0036] When the bottom of the inner tube does not contact the car floor, the movable bracket of the display device is in its initial state under the elastic force of the elastic element, and the indicator piece displaying the green mark is exposed in the viewing slot.

[0037] Compared with the prior art, the advantages of this utility model are: the first adjustment button, by exposing the outer end of the button portion to the fixed cover and integrally molding the button portion with the actuator, allows the user to easily control the operation of the locking mechanism by pressing with their finger. This technical means not only simplifies the operation steps but also works closely with the internal structure of the locking mechanism. When the user presses the button portion, the linear movement of the actuator, through the cooperation of the inclined groove and the shaft, precisely drives the locking piece to switch between the first and second positions.

[0038] The mounting cavity of the fixed cover is divided into a side cavity and an inner cavity, providing a stable mounting space for the locking mechanism. The button is located in the side cavity, ensuring convenient operation for the user; while the actuator is located in the inner cavity, preventing external factors from interfering with the locking mechanism.

[0039] The inner wall of the inner tube has multiple slots arranged along its length, allowing users to flexibly select the appropriate locking position according to different car models and seat heights. This multi-position design enables the support leg to adapt to various usage scenarios, ensuring the stability and safety of the child safety seat in both small cars and large SUVs. Attached Figure Description

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0041] Figure 1 A schematic diagram of the overall structure of a child safety seat;

[0042] Figure 2 Schematic diagram of the overall structure of the retractable support leg Figure 1 ;

[0043] Figure 3 Schematic diagram of the overall structure of the retractable support leg Figure 2 ;

[0044] Figure 4 This is a disassembled diagram of the retractable support leg structure;

[0045] Figure 5 This is a partial structural diagram of the retractable support leg;

[0046] Figure 6 This is a schematic diagram showing the assembly state of the fixed cover and the outer tube;

[0047] Figure 7 A schematic diagram of the locking mechanism and two adjustment buttons;

[0048] Figure 8 A schematic diagram of the overall structure of the front shell of the fixed cover;

[0049] Figure 9 This is a schematic diagram of the structure of the first and second adjustment buttons;

[0050] Figure 10 This is a schematic diagram of the structure with a display device at the bottom of the inner tube;

[0051] Figure 11 A disassembled diagram of the inner tube and display device structure;

[0052] Figure 12 Schematic diagram of the internal structure of the display device Figure 1 ;

[0053] Figure 13 Schematic diagram of the internal structure of the display device Figure 2 ;

[0054] Figure 14 This is a schematic diagram showing the connection status between the inner tube and the top cover. Detailed Implementation

[0055] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0056] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it will not be further defined and explained in subsequent figures.

[0057] like Figures 1 to 5As shown, the retractable support leg 100 of the child safety seat is connected to the middle of the front side of the child safety seat and extends vertically. It is a key component used to enhance the stability and safety of the child safety seat. The support leg 100 mainly includes: an outer tube 10, an inner tube 20, a fixing cover 30, and a locking mechanism 40.

[0058] The inner tube 20 is the movable part of the support leg, which can extend into the outer tube 10. This telescopic design allows the support leg to be flexibly adjusted according to different vehicle models and seat heights, thereby ensuring that the child safety seat achieves optimal support in various vehicle environments.

[0059] like Figure 6 As shown, the outer tube 10 serves to fix and guide, and its inner wall is provided with a positioning groove 11. This positioning groove 11 is a key mating component of the locking mechanism 40, used to guide the movement direction of the locking piece 42, and to ensure the accuracy and stability of the locking and unlocking operations.

[0060] The inner wall of the inner tube 20 is provided with multiple positioning slots 21, which are evenly arranged along the length of the inner tube. Each positioning slot 21 corresponds to a specific telescopic length. When the locking piece 42 of the locking mechanism 40 is inserted into a certain positioning slot 21, the inner tube 20 is fixed in that position, thereby realizing the length adjustment function of the support leg. This multi-position design not only improves the adaptability of the support leg, but also ensures a stable locking state at different telescopic lengths.

[0061] The fixing cover 30 is installed at the lower end of the outer tube 10. It not only protects and fixes the locking mechanism 40, but also provides installation space for the locking mechanism 40. The fixing cover 30 has a reasonable structural design, which can ensure the stability and reliability of the locking mechanism 40 during operation, while providing a convenient operating interface for users.

[0062] like Figure 7 , Figure 9 As shown, the locking mechanism 40 is the core component of the support leg. It cooperates with the positioning groove 11 of the outer tube 10 and the stop groove 21 of the inner tube 20 to achieve the locking and unlocking functions of the inner tube 20 relative to the outer tube 10. This locking mechanism is both simple and efficient, ensuring the stability of the support leg during vehicle operation, while also allowing users to make quick adjustments when needed.

[0063] Specifically, the locking mechanism 40 is a key component of the support leg 100, used to achieve the locking and unlocking functions between the inner tube 20 and the outer tube 10. The locking mechanism 40 mainly includes a first adjustment button 41 and a locking piece 42. To accommodate the locking mechanism 40, the fixing cover 30 has a specially provided mounting cavity 31, the structure and size of which match the locking mechanism 40, ensuring that the locking mechanism 40 can operate stably during operation. The locking piece 42 is one of the core components of the locking mechanism 40. It is inserted into the positioning groove 11 on the inner wall of the outer tube 10, and through its cooperation with the positioning groove 11, it achieves the locking function of the inner tube 20.

[0064] The first adjustment button 41 consists of an integrally formed button part d1 and an actuator part d2. At least a portion of the button part d1 protrudes from the outer wall of the fixed cover 30, allowing the user to easily control the operation of the locking mechanism 40 by pressing or flicking the button part d1 with their finger. When the user presses the button part d1, the actuator part d2 will move linearly accordingly. The actuator part d2 is connected to the locking piece 42 through a drive assembly 50. The function of the drive assembly 50 is to convert the linear movement of the actuator part d2 into the lateral movement of the locking piece 42, thereby enabling the locking piece 42 to enter or leave the stop slot 21 on the inner tube 20.

[0065] When the locking piece 42 enters the positioning slot 21, the inner tube 20 is locked within the outer tube 10 and cannot extend or retract, thus ensuring the stability of the support leg during use. When the locking piece 42 leaves the positioning slot 21, the inner tube 20 can extend and retract freely, allowing the user to adjust the length of the support leg as needed. This locking and unlocking mechanism is simple and efficient, easy to operate, and structurally reliable, effectively meeting the needs of child safety seats in different usage scenarios.

[0066] To achieve precise movement of the locking piece 42, the drive assembly 50 employs a specific mechanical structure. Specifically, the drive assembly 50 includes two key components: a slant groove 52 and a shaft 51. This technique not only has a simple structure but also efficiently converts the lateral linear motion of the actuator d2 into the forward and backward linear motion of the locking piece 42, thereby achieving locking and unlocking functions.

[0067] The actuator d2 of the first adjustment button 41 consists of two support walls d3, which together form a receiving cavity d4. The internal space of the receiving cavity d4 can precisely accommodate the locking piece 42, ensuring that the locking piece 42 remains stable and does not shift during movement. A pair of symmetrical inclined slots 52 are formed on each of the two support walls d3. These inclined slots 52 are key structures of the drive assembly 50; their tilt angle and position are specifically set to ensure that the locking piece 42 can move smoothly along a predetermined trajectory.

[0068] The locking piece 42 has a through hole 43 in the middle, the size and shape of which precisely match the shaft 51. The locking piece 42 is placed in the receiving cavity d4, and its through hole 43 is located exactly between the two support walls d3. Preferably, the shaft 51 is a slender metal or high-strength plastic shaft, with its two ends embedded in the inclined grooves 52 on the two support walls d3 respectively. When the actuator d2 moves linearly, the shaft 51 slides in the inclined grooves 52. Due to the inclination angle of the inclined grooves 52, the movement of the shaft 51 will drive the locking piece 42 to move linearly in the front-back direction.

[0069] When the user presses the button d1 of the first adjustment button 41, the actuator d2 moves in a straight line. Since both ends of the shaft 51 are located in the inclined groove 52 and the shaft 51 passes through the through hole 43 of the locking piece 42, the linear movement of the actuator d2 is converted into the back-and-forth linear movement of the locking piece 42 through the cooperation of the shaft 51 and the inclined groove 52. When the locking piece 42 moves laterally and enters the gear slot 21 of the inner tube 20, the inner tube 20 is locked; and when the locking piece 42 moves laterally and leaves the gear slot 21, the inner tube 20 is unlocked.

[0070] In addition, such as Figure 7 , Figure 8 As shown, in order to better accommodate and secure the locking mechanism 40, the mounting cover 30 has a unique mounting cavity 31 inside, which consists of two parts: a side cavity 311 and an inner cavity 312. This split layout not only provides sufficient space for the locking mechanism 40, but also ensures its stability and reliability during operation.

[0071] The side cavity 311 is located outside the side wall of the outer tube 10 and is mainly used to accommodate the button part d1 of the first adjustment button 41. The outer end of the button part d1 is cleverly exposed on the outer wall of the fixed cover 30, so that the user can easily operate the locking mechanism 40 by pressing or flicking with his / her finger.

[0072] The inner cavity 312 is located outside the inner wall of the outer tube 10 and is mainly used to accommodate the actuator d2 of the first adjustment button 41. The actuator d2 is located in the inner cavity 312 and is connected to the button part d1 through an integral structure. When the user operates the button part d1, the actuator d2 will move linearly in the inner cavity 312, thereby driving the locking piece 42 to achieve the locking or unlocking function. The design of the inner cavity 312 provides a stable movement space for the actuator d2, ensuring that it can move smoothly and accurately during operation.

[0073] The first adjustment button 41 is the core operating component of the locking mechanism 40, used to precisely control the switching of the locking piece 42 between two key positions. These two positions are the locked position (first position) and the unlocked position (second position).

[0074] When the first adjustment button 41 is pressed, the locking piece 42 is driven to the first position. In this position, the locking piece 42 passes through the positioning groove 11 on the inner wall of the outer tube 10 and is precisely inserted into any of the position grooves 21 of the inner tube 20. This securely locks the inner tube 20 inside the outer tube 10, preventing it from extending or retracting, thus ensuring the stability of the support leg during use.

[0075] Conversely, when the first adjustment button 41 is released, the locking piece 42 is driven to the second position. At this time, the locking piece 42 exits from the stop groove 21 of the inner tube 20, and the inner tube 20 can extend and retract freely. The user can adjust the length of the support leg as needed.

[0076] To ensure the operational stability and reset function of the first adjustment button 41, a first spring f1 is configured between it and the fixed cover 30. The function of the first spring f1 is to automatically return the first adjustment button 41 to its initial position when the user releases the button, thereby ensuring that the locking piece 42 can accurately disengage from the position slot 21 and achieve the unlocking function. The first adjustment button 41 is located on the first side of the fixed cover 30, a position that is convenient for user operation and also provides sufficient space for the internal components of the locking mechanism 40.

[0077] In addition, such as Figure 9 As shown, a second adjustment button 60 is disposed on the second side of the fixed cover 30. Similar to the first adjustment button 41, the second adjustment button 60 is also equipped with a second spring f2. The function of the second spring f2 is to provide pressing feedback for the second adjustment button 60 and ensure that it can automatically reset after operation.

[0078] This dual-button design significantly improves the user's balance during operation, allowing for more natural hand-eye coordination. When operating the support leg, users typically need both hands to ensure stability and accuracy. Although the second adjustment button 60 is not directly involved in the locking or unlocking mechanism, its presence allows the user to place their other hand on the second side of the fixing cover 30 and press the second adjustment button 60 to balance the operation. This two-handed operation method significantly improves the user's balance and stability during operation.

[0079] Preferably, the fixing cover 30 includes a front shell 32 and a rear cover 33; the front shell 32 and the rear cover 33 are fixed to each other by a screw assembly, which facilitates the assembly and disassembly of the product. The front shell 32 is fixed to the inner wall of the outer tube 10 by a pin v to prevent the fixing cover 30 from rotating or shifting during use. Moreover, it is preferable that both the outer tube 10 and the inner tube 20 are square tubes.

[0080] like Figure 10 and Figure 11As shown, in order to intuitively indicate whether the inner tube 20 is in contact with the car floor, a positioning display device 70 is provided at the bottom of the inner tube 20. The display device 70 consists of a mounting housing 71, a movable bracket 72, an elastic element 73, and two indicator plates t with different indication content, which can clearly provide feedback to the user on the support status of the support leg.

[0081] The mounting housing 71 is the main structure of the display device 70, consisting of a top cover 711 and a housing 712. A movable bracket 72 is vertically movably mounted inside the housing 712, and an elastic element 73 is provided between the top cover 711 and the movable bracket 72. The function of the elastic element 73 is to provide elastic force to the movable bracket 72, enabling it to return to its original position, and also to maintain the movable bracket 72 in a stable state under different conditions.

[0082] like Figure 12 , Figure 13 As shown, the movable support 72 has an indicator arm 721 on its side, and two indicator pieces t (t1 and t2, respectively) are mounted vertically on the indicator arm 721. The housing 712 has a viewing slot c on its side to expose the indicator pieces t on the indicator arm 721 of the movable support 72, thereby showing the user the current support status.

[0083] When the bottom of the inner tube 20 is supported against the car floor, the movable bracket 72 of the display device 70 moves upward, thereby compressing the elastic element 73. At this time, the indicator t1 with the red mark will be exposed from the viewing slot c, indicating to the user that the support leg has made contact with the car floor.

[0084] Conversely, when the bottom of the inner tube 20 does not contact the car floor, the movable bracket 72 will return to its initial state under the elastic force of the elastic element 73. At this time, the indicator t2 with the green mark will be exposed from the viewing slot c, indicating that the support leg has not yet contacted the floor and further adjustment is required.

[0085] To ensure the structural stability of the display device 70, such as Figure 14 As shown, the top cover 711 is fixedly connected to the inner tube 20 by self-tapping screws, and the top cover 711 and the housing 712 are fixedly connected by a screw assembly.

[0086] Furthermore, to guide the compression and extension path of the elastic element 73, guide posts are symmetrically arranged on the bottom wall of the top cover 711, and the elastic element 73 is a spring sleeved on the guide posts. This technical means not only improves the working stability of the elastic element 73, but also ensures that the up and down movement of the movable bracket 72 is more stable and accurate.

[0087] In the description of this utility model, it should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Similarly, "first" and "second" are only for ease of understanding and have no other directional meaning, and cannot be considered as limitations on this utility model.

[0088] This invention describes the retractable support leg of a child safety seat. Specific examples are used to illustrate the principle and implementation of this invention. The descriptions of these embodiments are merely for the purpose of helping to understand this invention and its core concepts. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A retractable support leg for a child safety seat, characterized in that: It includes an outer tube, an inner tube, a fixing cover, and a locking mechanism; the upper end of the inner tube extends into the outer tube, and the fixing cover is installed at the lower end of the outer tube; the inner wall of the outer tube is provided with a positioning groove, and the inner wall of the inner tube is provided with multiple positioning grooves arranged in the length direction. The locking mechanism includes a first adjustment button and a locking piece; the fixing cover provides a mounting cavity for accommodating the locking mechanism; the first adjustment button includes an integral button part and an actuating part, the actuating part includes two support walls forming the receiving cavity, and the two support walls are provided with a pair of inclined grooves; the locking piece is provided with a through hole in the middle, the locking piece is placed in the receiving cavity, the two ends of a shaft are located on the pair of inclined grooves, and the middle of the shaft passes through the through hole of the locking piece; The mounting cavity of the fixing cover includes a side cavity located outside the side wall of the outer tube and an inner cavity located outside the inner wall of the outer tube. The button part is located in the side cavity and its outer end protrudes from the fixing cover. The actuating part is located in the inner cavity. The first adjustment button can control the locking piece to switch between a first position and a second position; in the first position, the locking piece passes through the positioning groove of the outer tube and enters any position groove of the inner tube, and the position of the inner tube is locked; in the second position, the locking piece exits the position groove of the inner tube, and the inner tube can extend and retract relative to the outer tube.

2. The retractable support leg of the child safety seat according to claim 1, characterized in that: A first spring is provided between the first adjustment button and the fixed cover.

3. The retractable support leg of the child safety seat according to claim 1, characterized in that: The first adjustment button is located on the first side of the fixed cover; A second adjustment button is provided on the second side of the fixed cover, and a second spring is configured to allow the second adjustment button to be pressed.

4. The retractable support leg of claim 1, wherein: The fixing cover includes a front shell and a rear cover; the front shell and the rear cover are fixed together by a screw assembly. The front shell is fixed to the inner wall of the outer tube by pins.

5. The retractable support leg of claim 1, wherein: Both the outer and inner tubes are square tubes.

6. The retractable support leg of claim 1, wherein: The bottom of the inner tube is equipped with a positioning display device; The display device includes a mounting housing, a movable bracket, an elastic element, and two indicator plates with different indication contents; The mounting housing includes a top cover and a housing, the movable bracket is movably mounted inside the housing, and the elastic element is provided between the top cover and the movable bracket; The movable support is provided with an indicator arm on its side, and two indicator plates are installed on the indicator arm in a vertically distributed manner. The housing has a viewing slot on its side, through which at least one indicator piece on the movable support indicator arm is exposed.

7. The retractable support leg of a child safety seat, characterized in that: It includes an outer tube, an inner tube, a fixing cover, and a locking mechanism; the upper end of the inner tube extends into the outer tube, and the fixing cover is installed at the lower end of the outer tube; the inner wall of the outer tube is provided with a positioning groove, and the inner wall of the inner tube is provided with multiple positioning grooves arranged in the length direction. The locking mechanism includes a first adjustment button and a locking piece; the fixing cover provides a mounting cavity for accommodating the locking mechanism; the locking piece is inserted into a positioning groove on the inner wall of the outer tube; The first adjustment button includes an integral button part and an actuation part, with at least a portion of the button part protruding from the outer wall of the fixed cover; The locking piece is connected to the actuator via a drive assembly. The actuator moves linearly to drive the locking piece into or out of the gear slot, thereby locking or unlocking the inner tube relative to the outer tube.

8. A retractable support leg for a child safety seat according to claim 7, wherein: The drive assembly includes an inclined groove and a shaft formed on the support wall of the actuator; The actuator includes two support walls to form a receiving cavity, and a pair of inclined grooves are provided on the two support walls; a through hole is provided in the middle of the locking piece, the locking piece is placed in the receiving cavity, the two ends of the shaft are located on the pair of inclined grooves, and the middle of the shaft passes through the through hole of the locking piece; The mounting cavity of the fixing cover includes a side cavity located outside the side wall of the outer tube and an inner cavity located outside the inner wall of the outer tube. The button part is located in the side cavity and its outer end protrudes from the fixing cover. The actuating part is located in the inner cavity. The first adjustment button can control the locking piece to switch between a first position and a second position; in the first position, the locking piece passes through the positioning groove of the outer tube and enters any position groove of the inner tube, and the position of the inner tube is locked; in the second position, the locking piece exits the position groove of the inner tube, and the inner tube can extend and retract relative to the outer tube. A first spring is provided between the first adjustment button and the fixed cover, and the first adjustment button is located on the first side of the fixed cover.

9. The retractable support leg of claim 7, wherein: A second adjustment button is provided on the second side of the fixed cover and is equipped with a second spring so that the second adjustment button can be pressed.

10. The retractable support leg of claim 7, wherein: The bottom of the inner tube is provided with a positioning display device, which includes a mounting shell, a movable bracket, an elastic element, and two indicator plates with different indication contents. The mounting housing includes a top cover and a housing, the movable bracket is movably mounted inside the housing, and the elastic element is provided between the top cover and the movable bracket; The movable support is provided with an indicator arm on its side, and two indicator plates are installed on the indicator arm in a vertically distributed manner. The housing has a viewing slot on its side so that at least one indicator piece on the movable support indicator arm can be exposed from the viewing slot; When the bottom of the inner tube is supported to the car floor, the movable bracket of the display device moves upward to compress the elastic element, and the indicator piece displaying the red mark is exposed in the viewing slot. When the bottom of the inner tube does not contact the car floor, the movable bracket of the display device is in its initial state under the elastic force of the elastic element, and the indicator piece displaying the green mark is exposed in the viewing slot.

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