A support leg telescopic mechanism and a child safety seat

Abstract

A leg extension mechanism and a child safety seat are disclosed, relating to the field of child safety seat technology. The mechanism includes a housing, an inner tube, an outer tube, a release element, and a locking element. The inner tube is fixedly disposed inside the housing, and a receiving space exists between the outer wall of the inner tube and the inner wall of the housing. The outer tube is slidably disposed within this receiving space. The release element and the locking element are respectively disposed between the outer tube and the inner tube. The release element abuts against the outer tube, and its movement along the extension direction of the outer tube can cause the locking element to be fixed or separated from the inner tube, thereby adjusting the relative position between the outer tube and the housing. This leg extension mechanism and child safety seat facilitate extension and retraction operations, improving the user experience of the child safety seat.

Description

Technical Field

[0001] This invention relates to the field of child safety seat technology, and more specifically, to a support leg telescopic mechanism and a child safety seat. Background Technology

[0002] A child safety seat is a car accessory that is attached to a vehicle seat and provides restraint and protection. It is specifically designed for children of different weights and ages and effectively improves child passenger safety. In the event of a car collision or sudden deceleration, it reduces the impact force on the child and restricts their body movement, thereby mitigating injury.

[0003] Generally, child safety seats have support legs underneath to brace against the vehicle floor, increasing the seat's stability and thus improving its safety. However, existing support leg structures are relatively complex and inconvenient to extend or retract. Summary of the Invention

[0004] The purpose of this invention is to provide a support leg telescopic mechanism and a child safety seat, which facilitates telescopic operation and improves the user experience of the child safety seat.

[0005] The embodiments of the present invention are implemented as follows:

[0006] In one aspect, this invention provides a retractable support leg mechanism, including a housing, an inner tube, an outer tube, a release element, and a locking element. The inner tube is fixedly disposed inside the housing, and a receiving space exists between the outer wall of the inner tube and the inner wall of the housing. The outer tube is slidably disposed within the receiving space. The release element and the locking element are respectively disposed between the outer tube and the inner tube. The release element abuts against the outer tube. The release element moves along the extension direction of the outer tube, which can cause the locking element to be fixed or separated from the inner tube, thereby adjusting the relative position between the outer tube and the housing. This retractable support leg mechanism facilitates retraction and extension operations, improving the user experience of the child safety seat.

[0007] Optionally, it also includes a limiting block, which is fixedly disposed inside the outer tube and located between the release member and the inner tube. The limiting block is provided with a guide channel, and the first end of the locking member is slidably disposed in the guide channel. The release member moves along the extension direction of the outer tube and can be fixed or separated from the inner tube by the second end of the locking member.

[0008] Optionally, the unlocking member is provided with a sliding groove, and the second end of the locking member is provided with a protrusion, which can slide along the sliding groove to make the first end of the locking member approach or move away from the inner tube.

[0009] Optionally, a first gear rack is arranged on the outer wall of the inner tube along the extending direction of the outer tube, and the locking member is arranged with a second gear rack close to the side wall of the inner tube, the second gear rack and the first gear rack are engaged with each other to fix the locking member and the inner tube.

[0010] Optionally, the releasing member is in a U-shaped structure, two side arms of the U-shaped structure are respectively located on opposite sides of the inner tube, and a connecting arm connecting the two side arms of the U-shaped structure abuts against the outer tube, the locking member, the limiting block and the first gear rack each include two, and the two locking members, the two limiting blocks and the two first gear racks are respectively located on opposite sides of the inner tube.

[0011] Optionally, a cover plate is further included, the cover plate is fixedly covered on the outer tube, a through hole is arranged on the cover plate, a handle is arranged on the connecting arm of the U-shaped structure, and the handle can extend out of the cover plate through the through hole.

[0012] Optionally, an elastic member is arranged between the cover plate and the side arm of the U-shaped structure, and the extending direction of the elastic member is parallel to the extending direction of the outer tube.

[0013] Optionally, a limiting cover is further included, the limiting cover is fixedly covered on the inner tube, a limiting portion is arranged on the limiting cover, and the limiting portion abuts against the limiting block to limit the relative position between the outer tube and the shell.

[0014] Optionally, a fixing member is further included, the fixing member is fixedly arranged in the shell, a clamping portion is arranged on the side wall of the inner tube towards the fixing member, a clamping groove is arranged on the outer wall of the inner tube, and the clamping portion is accommodated in the clamping groove to clamp the fixing member and the inner tube.

[0015] In another aspect of the embodiment of the present application, a safety seat is provided, which comprises the support leg telescopic mechanism. The support leg telescopic mechanism can facilitate telescopic operation and improve the use experience of the safety seat.

[0016] The beneficial effects of the embodiment of the present application include:

[0017] The support leg telescopic mechanism comprises a shell, an inner tube, an outer tube, a release lock and a locking piece. The inner tube is fixedly arranged in the shell, and a containing space is formed between the outer wall of the inner tube and the inner wall of the shell. The outer tube is slidingly arranged in the containing space, so that the outer tube can move relative to the shell, i.e., the outer tube and the shell can have relative displacement, so that the outer tube and the shell can be adjusted in length. Specifically, when the outer tube moves relative to the shell in a direction away from the shell, the length of the support leg telescopic mechanism gradually increases, until the outer tube reaches the farthest position relative to the shell, and the length of the support leg telescopic mechanism reaches the maximum. When the outer tube moves relative to the shell in a direction close to the shell, the length of the support leg telescopic mechanism gradually decreases, until the outer tube reaches the closest position relative to the shell, and the length of the support leg telescopic mechanism reaches the minimum. In order to control the adjustment of the relative position between the outer tube and the shell, the release lock and the locking piece are arranged between the outer tube and the inner tube. The release lock and the outer tube abut each other, and the release lock moves along the extension direction of the outer tube to drive the locking piece to be fixed or separated from the inner tube, so as to adjust the relative position between the outer tube and the shell. Specifically, when the locking piece is fixed to the inner tube, the outer tube and the shell are relatively fixed, so that the length of the support leg telescopic mechanism is fixed. When the locking piece is separated from the inner tube, the outer tube and the shell can slide freely, so that the length of the support leg telescopic mechanism can be changed. The support leg telescopic mechanism can drive the locking piece to be fixed or separated from the inner tube by pulling the release lock, so as to adjust the relative position between the outer tube and the shell, thereby changing the length of the support leg telescopic mechanism. The support leg telescopic mechanism has the advantages of simple structure and convenient operation, and can improve the use experience of the safety seat. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0019] Figure 1 One of the structural schematic diagrams of the support leg telescopic mechanism provided by the embodiments of the present application;

[0020] Figure 2 The second structural schematic diagram of the support leg telescopic mechanism provided by the embodiments of the present application;

[0021] Figure 3 The third structural schematic diagram of the support leg telescopic mechanism provided by the embodiments of the present application;

[0022] Figure 4 Figure 4 is a structural schematic view of a support leg telescopic mechanism according to an embodiment of the present application;

[0023] Figure 5 Figure 5 is a structural schematic view of a support leg telescopic mechanism according to an embodiment of the present application;

[0024] Figure 6 Figure 6 is a structural schematic view of a support leg telescopic mechanism according to an embodiment of the present application.

[0025] Figure: 100 - support leg telescopic mechanism; 10 - shell; 20 - inner tube; 21 - first rack; 22 - clamping groove; 30 - outer tube; 40 - release lock; 41 - sliding groove; 42 - handle; 43 - elastic member; 50 - locking member; 51 - protrusion; 52 - second rack; 60 - limiting block; 61 - guide channel; 70 - cover plate; 71 - through hole; 80 - limiting cover; 90 - fixing member; 91 - clamping portion. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor fall within the scope of protection of the present application.

[0028] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0029] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed during use, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0030] In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0031] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the connection between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] Please refer to Figures 1 to 6 The embodiment provides a support leg telescopic mechanism 100, which comprises a shell 10, an inner tube 20, an outer tube 30, a release lock piece 40 and a locking piece 50. The inner tube 20 is fixedly arranged inside the shell 10, and the outer wall of the inner tube 20 and the inner wall of the shell 10 have an accommodation space. The outer tube 30 is slidingly arranged in the accommodation space. The release lock piece 40 and the locking piece 50 are arranged between the outer tube 30 and the inner tube 20, respectively. The release lock piece 40 and the outer tube 30 abut each other, and the release lock piece 40 moves along the extension direction of the outer tube 30, which can drive the locking piece 50 to be fixed or separated from the inner tube 20, so as to adjust the relative position between the outer tube 30 and the shell 10. The support leg telescopic mechanism 100 can facilitate telescopic operation and improve the use experience of the safety seat.

[0033] It should be noted that, as Figures 1 to 6As shown, the support leg telescopic mechanism 100 comprises a housing 10, an inner tube 20 and an outer tube 30, the inner tube 20 is fixedly arranged inside the housing 10, and the outer tube 30 is slidably arranged in the accommodating space between the outer wall of the inner tube 20 and the inner wall of the housing 10. Therefore, the outer tube 30 can move relative to the housing 10, or in other words, the outer tube 30 and the housing 10 can have relative displacement, so that the outer tube 30 and the housing 10 can be adjusted in length. Specifically, when the outer tube 30 moves relative to the housing 10 in a direction away from the housing 10, the length of the support leg telescopic mechanism 100 gradually increases, and when the outer tube 30 reaches the farthest position relative to the housing 10, the length of the support leg telescopic mechanism 100 reaches the maximum; when the outer tube 30 moves relative to the housing 10 in a direction towards the housing 10, the length of the support leg telescopic mechanism 100 gradually decreases, and when the outer tube 30 reaches the closest position relative to the housing 10, the length of the support leg telescopic mechanism 100 reaches the minimum.

[0034] In order to control the adjustment of the relative position between the outer tube 30 and the housing 10, as shown, Figures 1 to 6 The support leg telescopic mechanism 100 comprises a release lock 40 and a locking piece 50, which are arranged between the outer tube 30 and the inner tube 20, respectively. The release lock 40 and the outer tube 30 abut each other, and the release lock 40 moves along the extension direction of the outer tube 30, which can drive the locking piece 50 to fix or separate from the inner tube 20, so as to adjust the relative position between the outer tube 30 and the housing 10. Among them, pulling the release lock 40 to move along the extension direction of the outer tube 30 can drive the locking piece 50 to fix or separate from the inner tube 20, and since the release lock 40 and the outer tube 30 abut each other, the inner tube 20 is fixedly connected with the housing 10, so as to adjust the relative position between the outer tube 30 and the housing 10. Specifically, when the locking piece 50 and the inner tube 20 are fixed, the outer tube 30 and the housing 10 are relatively fixed, so the length of the support leg telescopic mechanism 100 is fixed; when the locking piece 50 and the inner tube 20 are separated, the outer tube 30 and the housing 10 can slide freely, so the length of the support leg telescopic mechanism 100 can be changed.

[0035] The specific structure and actual shape of the housing 10, the inner tube 20, the outer tube 30, the release lock 40 and the locking piece 50 are not limited here, and those skilled in the art can make reasonable choices and designs according to actual conditions. For example, Figure 1 and Figure 2As shown, in this embodiment, the housing 10 includes a first sub-housing 10 and a second sub-housing 10 that are fixedly connected (may be integrally formed). The first sub-housing 10 has a rectangular structure with open ends, and the second sub-housing 10 has a trapezoidal structure with an open top and a closed bottom. In this way, the inner tube 20 and the outer tube 30 can be respectively disposed inside the housing 10. In addition, the bottom of the housing 10 (i.e., the end where the second sub-housing 10 is located) has a larger contact surface with the external environment, thereby making the support leg telescopic mechanism 100 more stable and firm.

[0036] As described above, the support leg telescopic mechanism 100 includes a housing 10, an inner tube 20, an outer tube 30, a release element 40, and a locking element 50. The inner tube 20 is fixedly disposed inside the housing 10, and there is a receiving space between the outer wall of the inner tube 20 and the inner wall of the housing 10. The outer tube 30 is slidably disposed within the receiving space. Therefore, the outer tube 30 can move relative to the housing 10, that is, relative displacement can occur between the outer tube 30 and the housing 10, so that the extension and retraction adjustment between the outer tube 30 and the housing 10 can be performed. Specifically, when the outer tube 30 moves away from the housing 10 relative to the housing 10, the length of the support leg telescopic mechanism 100 gradually increases until the outer tube 30 reaches its farthest position relative to the housing 10, at which point the length of the support leg telescopic mechanism 100 reaches its maximum. When the outer tube 30 moves closer to the housing 10 relative to the housing 10, the length of the support leg telescopic mechanism 100 gradually decreases until the outer tube 30 reaches its closest position relative to the housing 10, at which point the length of the support leg telescopic mechanism 100 reaches its minimum. To control the adjustment of the relative position between the outer tube 30 and the housing 10, a release element 40 and a locking element 50 are respectively disposed between the outer tube 30 and the inner tube 20. The release element 40 abuts against the outer tube 30. The release element 40 moves along the extension direction of the outer tube 30, causing the locking element 50 to be fixed or separated from the inner tube 20, thereby adjusting the relative position between the outer tube 30 and the housing 10. Specifically, pulling the release element 40 along the extension direction of the outer tube 30 can cause the locking element 50 to be fixed or separated from the inner tube 20. Since the release element 40 abuts against the outer tube 30 and the inner tube 20 is fixedly connected to the housing 10, the relative position between the outer tube 30 and the housing 10 can be adjusted. Specifically, when the locking member 50 is fixed to the inner tube 20, the outer tube 30 is relatively fixed to the housing 10, thus the length of the support leg telescopic mechanism 100 remains constant. When the locking member 50 is separated from the inner tube 20, the outer tube 30 can slide freely to the housing 10, thus the length of the support leg telescopic mechanism 100 can be changed. This support leg telescopic mechanism 100 can adjust the relative position between the outer tube 30 and the housing 10 by pulling the release member 40 to fix or separate the locking member 50 from the inner tube 20, thereby changing the length of the support leg telescopic mechanism 100. It has the advantages of simple structure and convenient operation, and can improve the user experience of the child safety seat.

[0037] like Figures 1 to 6 As shown, in this embodiment, the support leg telescopic mechanism 100 further includes a limiting block 60, which is fixedly disposed inside the outer tube 30 and located between the release member 40 and the inner tube 20. The limiting block 60 is provided with a guide channel 61, and the first end of the locking member 50 is slidably disposed in the guide channel 61. The release member 40 moves along the extension direction of the outer tube 30, and the first end of the locking member 50 can be fixed or separated from the inner tube 20 by the second end of the locking member 50.

[0038] It should be noted that the limiting block 60 is fixedly installed inside the outer tube 30, and the limiting block 60 is located between the release member 40 and the inner tube 20. The limiting block 60 is provided with a guide channel 61. The first end of the locking member 50 is slidably installed in the guide channel 61, and the second end of the locking member 50 extends out of the guide channel 61. That is, the first end of the locking member 50 is located on the side closer to the inner tube 20, and the second end of the locking member 50 is located on the side closer to the release member 40. Therefore, the locking member 50 can move relative to the limiting block 60 along the guide channel 61. In this way, pulling the release member 40 to move along the extension direction of the outer tube 30 can drive the first end of the locking member 50 to move through the second end of the locking member 50. When the locking member 50 moves along the guide channel 61 relative to the limiting block 60 toward the direction closer to the inner tube 20, the first end of the locking member 50 can be fixed with the inner tube 20, so that the outer tube 30 and the shell 10 are relatively fixed; when the locking member 50 moves along the guide channel 61 relative to the limiting block 60 toward the direction away from the inner tube 20, the first end of the locking member 50 can be separated from the inner tube 20, so that the outer tube 30 and the shell 10 can slide freely.

[0039] The specific structure and actual shape of the limiting block 60 are not specifically limited here, and those skilled in the art should be able to make reasonable selections and designs based on the actual situation. For example, in this embodiment, the limiting block 60 is provided with at least one first through hole 71, and the outer tube 30 is provided with at least one second through hole 71. The limiting block 60 is disposed inside the outer tube 30, and the second through hole 71 and the first through hole 71 are arranged in a one-to-one correspondence. Fasteners (such as bolts, screws, etc.) pass through the second through hole 71 and the first through hole 71 in sequence to fix the limiting block 60 to the outer tube 30.

[0040] like Figures 1 to 6 As shown, in this embodiment, the release member 40 is provided with a groove 41, and the second end of the locking member 50 is provided with a protrusion 51. The protrusion 51 can slide along the groove 41 so that the first end of the locking member 50 is close to or away from the inner tube 20.

[0041] Specifically, when the release member 40 is pulled to move along the extension direction of the outer tube 30, the protrusion 51 can abut against the slide groove 41 and slide along the slide groove 41. At this time, the release member 40 will generate a horizontal force on the locking member 50. This horizontal force can cause the first end of the locking member 50 to move closer to or away from the inner tube 20 by acting on the second end of the locking member 50.

[0042] To improve the stability of the locking member 50 when it is fixed to the inner tube 20, such as Figure 3 and Figure 6 As shown, in this embodiment, a first rack 21 is provided on the outer wall of the inner tube 20 along the extension direction of the outer tube 30, and a second rack 52 is provided on the side wall of the locking member 50 near the inner tube 20. The second rack 52 and the first rack 21 mesh with each other so that the locking member 50 is fixedly connected to the inner tube 20.

[0043] Specifically, the second rack 52 meshes with the first rack 21 to fix the locking member 50 to the inner tube 20. At this time, the outer tube 30 is relatively fixed to the housing 10, and the length of the support leg telescopic mechanism 100 remains unchanged. The second rack 52 disengages from the first rack 21 to separate the locking member 50 from the inner tube 20. At this time, the outer tube 30 can slide freely with the housing 10, and the length of the support leg telescopic mechanism 100 can be changed.

[0044] like Figures 1 to 6 As shown, in this embodiment, the release member 40 has a U-shaped structure. The two side arms of the U-shaped structure are located on opposite sides of the inner tube 20. The connecting arm connecting the two side arms of the U-shaped structure abuts against the outer tube 30. The locking member 50, the limiting block 60 and the first rack 21 are all included in two. The two locking members 50, the two limiting blocks 60 and the two first racks 21 are located on opposite sides of the inner tube 20.

[0045] It should be noted that the release member 40 has a U-shaped structure, which includes two side walls and a connecting arm connecting the two side walls. The two side arms of the U-shaped structure are located on opposite sides of the inner tube 20, and the connecting arm of the U-shaped structure abuts against the outer tube 30. In addition, there are two locking members 50, two limiting blocks 60, and two first racks 21. The two locking members 50, two limiting blocks 60, and two first racks 21 are located on opposite sides of the inner tube 20, so that the components of the support leg telescopic mechanism 100 are symmetrically distributed, thereby improving the uniformity of force on the support leg telescopic mechanism 100 and preventing the outer tube 30 from being loosely fixed to the housing 10 or from swaying left and right during the telescopic adjustment of the support leg telescopic mechanism 100.

[0046] like Figures 1 to 6As shown, in this embodiment, the support leg telescopic mechanism 100 further includes a cover plate 70, which is fixedly fitted onto the outer tube 30. The cover plate 70 has a through hole 71, and the U-shaped connecting arm is provided with a handle 42. Figure 4 and Figure 5 As shown, the handle 42 can extend out of the cover plate 70 through the through hole 71, so that the user can pull the release member 40 by simply pulling the handle 42, thereby making the support leg telescopic mechanism 100 easy to operate.

[0047] To further improve the ease of operation of the support leg telescopic mechanism 100, such as Figures 1 to 6 As shown, in this embodiment, an elastic element 43 is provided between the cover plate 70 and the side arm of the U-shaped structure, and the extending direction of the elastic element 43 is parallel to the extending direction of the outer tube 30. Corresponding to the elastic element 43, along the extending direction of the outer tube 30, there is a certain distance between the protrusion 51 of the locking element 50 and the sliding groove 41 of the releasing element 40.

[0048] Specifically, such as Figure 3 and Figure 4 As shown, when the user pulls the release element 40 to move it away from the housing 10, the distance between the slide groove 41 and the protrusion 51 gradually decreases until the protrusion 51 and the slide groove 41 abut against each other. At the same time, the resisting force provided by the cover plate 70 and the U-shaped side arm at both ends of the elastic element 43 gradually increases, thereby causing the elastic element 43 to gradually compress and accumulate elastic potential energy; Figure 5 and Figure 6 As shown, when the user releases the release member 40 (for example, after adjusting the relative position between the outer tube 30 and the housing 10 to the desired position), the supporting force provided by the cover plate 70 and the U-shaped structure side arm at both ends of the elastic member 43 gradually decreases, thereby causing the elastic member 43 to release elastic potential energy and gradually elongate. In this way, the release member 40 will move towards the side closer to the housing 10 under the action of the elastic member 43. At this time, the distance between the slide groove 41 and the protrusion 51 gradually increases until it returns to the distance between the two in the natural state.

[0049] In order to limit the farthest position that the outer tube 30 can reach relative to the shell 10, such as Figures 1 to 6 As shown, in this embodiment, the support leg telescopic mechanism 100 further includes a limiting cover 80, which is fixedly attached to the inner tube 20. The limiting cover 80 has a limiting portion that abuts against the limiting block 60 to limit the relative position between the outer tube 30 and the housing 10. Specifically, when the outer tube 30 moves relative to the housing 10 towards the side away from the housing 10 until the limiting portion abuts against the limiting block 60, the outer tube 30 can no longer move relative to the housing 10 towards the side away from the housing 10, thereby preventing the outer tube 30 from completely detaching from the housing 10.

[0050] like Figures 4 to 6 As shown, in this embodiment, the support leg telescopic mechanism 100 further includes a fixing member 90, which is fixedly disposed inside the housing 10. The fixing member 90 has a snap-fit ​​part 91 on its side wall facing the inner tube 20, and a slot 22 is provided on the outer wall of the inner tube 20. The snap-fit ​​part 91 is accommodated in the slot 22 so that the fixing member 90 is snapped into the inner tube 20. That is, the inner tube 20 is fixedly connected to the housing 10 through the fixing member 90. In this way, when the inner tube 20 or the housing 10 needs to be replaced, the user can easily replace the damaged parts individually, thereby avoiding the waste of functional parts as much as possible.

[0051] Of course, in other embodiments, the inner tube 20 can also be fixedly connected to the shell 10 by welding, screwing or other methods. No specific restrictions are made here. Those skilled in the art should be able to make reasonable choices and designs according to the actual situation.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A support leg extension mechanism, characterized by, The support leg telescopic mechanism comprises a shell, an inner tube, an outer tube, a release lock and a lock piece, the inner tube is fixedly arranged in the shell, a containing space is formed between the outer wall of the inner tube and the inner wall of the shell, the outer tube is slidably arranged in the containing space, the release lock and the lock piece are arranged between the outer tube and the inner tube, the release lock and the outer tube abut against each other, the release lock moves along the extension direction of the outer tube, and the lock piece is fixed or separated from the inner tube, so that the relative position between the outer tube and the shell is adjusted; a first gear rack is arranged on the outer wall of the inner tube along the extension direction of the outer tube, a second gear rack is arranged on the side wall of the inner tube close to the lock piece, the second gear rack and the first gear rack abut against each other, so that the lock piece is fixedly connected with the inner tube; the release lock is in a U-shaped structure, two side arms of the U-shaped structure are located on opposite sides of the inner tube, and a connecting arm connecting the two side arms abuts against the outer tube.

2. The support leg extension mechanism of claim 1, wherein, Further comprising a limiting block, the limiting block is fixedly arranged in the outer tube, and the limiting block is located between the release lock and the inner tube, a guide channel is arranged on the limiting block, a first end of the lock piece is slidably arranged in the guide channel, and the release lock moves along the extension direction of the outer tube, so that the first end of the lock piece is fixed or separated from the inner tube through the second end of the lock piece.

3. The support leg extension mechanism of claim 2, wherein, A sliding groove is arranged on the release lock, a protrusion is arranged on the second end of the lock piece, the protrusion can slide along the sliding groove, so that the first end of the lock piece is close to or away from the inner tube.

4. The support leg extension mechanism of claim 2, wherein, The lock piece, the limiting block and the first gear rack each comprise two, and the two lock pieces, the two limiting blocks and the two first gear racks are located on opposite sides of the inner tube.

5. The support leg extension mechanism of claim 4, wherein, Further comprising a cover plate, the cover plate is fixedly covered on the outer tube, a through hole is arranged on the cover plate, a handle is arranged on the connecting arm of the U-shaped structure, and the handle can protrude out of the cover plate through the through hole.

6. The support leg extension mechanism of claim 5, wherein, A resilient member is arranged between the cover plate and the side arm of the U-shaped structure, and the extension direction of the resilient member is parallel to the extension direction of the outer tube.

7. The support leg extension mechanism of claim 2, wherein, Further comprising a limiting cover, the limiting cover is fixedly covered on the inner tube, a limiting portion is arranged on the limiting cover, and the limiting portion abuts against the limiting block, so as to limit the relative position between the outer tube and the shell.

8. The support leg extension mechanism of claim 1, wherein, Further comprising a fixing piece, the fixing piece is fixedly arranged in the shell, a clamping portion is arranged on the side wall of the inner tube towards the fixing piece, a clamping groove is arranged on the outer wall of the inner tube, and the clamping portion is accommodated in the clamping groove, so that the fixing piece is clamped with the inner tube.

9. A safety seat, characterized by The support leg telescopic mechanism comprises the support leg telescopic mechanism according to any one of claims 1-8.

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