A knobbed child seat support leg

Abstract

The application discloses a knob type child seat supporting leg, which comprises an adjusting gear, a supporting leg, an adjusting mechanism and a locking mechanism. The supporting leg is located at the bottom of the child seat and is composed of a fixed leg and a moving leg which are integrally formed. The moving leg is provided with a gear on one side, and the gear is in meshing transmission with the adjusting gear. The adjusting mechanism is arranged at the center of one end surface of the adjusting gear and is used for driving the adjusting gear to rotate, so that the height of the child seat is adjusted. The locking mechanism is arranged at the other end surface of the adjusting gear and is connected with the adjusting mechanism, and is used for locking the adjusting gear, so that the height of the child seat is fixed. The application realizes stepless adjustment of the child seat supporting leg, improves the stability of the seat, and makes the supporting leg more closely combined with the floor, thereby improving the compatibility.

Description

Technical Field

[0001] This invention relates to the field of car child seats, and more specifically, to a knob-type child seat support leg. Background Technology

[0002] The current child seat support legs use a guide rail and a guide groove. The guide rail is connected to the guide groove by a pin, and the pin is connected to a button by an oval iron ring. Pushing the button causes the pin to be pulled out and inserted through the action of the spring and the oval iron ring. This method is cumbersome and requires both hands to operate at the same time.

[0003] Figure 11 The image shows a height adjustment device for a child seat support leg. When in operation, a finger applies force to the ring buckle 103, and the pin 102 is pushed out of the slot 105 under the constraint of the spring 104 and the ring buckle 103. The guide rail 101 can be adjusted up and down. When the force applied to the ring buckle 103 is released, the pin 102 is pushed into the slot 105 by the force of the spring 104 applied to the ring buckle 103, thus fixing the guide rail 101.

[0004] Insufficient existing patents:

[0005] 1. The operation is not convenient enough. It requires two hands to adjust the length of the support leg. When one hand presses the button, the other hand needs to pull out the guide rail or push it into the guide groove. Therefore, it is difficult to adjust the posture of the child seat and match the seat support leg with the floor at the same time.

[0006] 2. It cannot be steplessly adjusted, so its applicability is not high and it is difficult to be well compatible with the actual needs of different car models.

[0007] Therefore, how to provide a child seat support leg that can effectively achieve stepless adjustment, improve seat stability, and make the support leg fit more closely to the floor has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0008] The purpose of this invention is to provide a knob-type child seat support leg, which enables stepless adjustment of the child seat support leg, improves seat stability, and allows the support leg to fit more closely to the floor, thus improving compatibility.

[0009] According to one aspect of the present invention, a rotary child seat support leg is provided, comprising an adjustment gear, a support leg, an adjustment mechanism, and a locking mechanism;

[0010] The support leg is located at the bottom of the child seat and consists of an integrally formed fixed leg and a movable leg. One side of the movable leg is provided with a gear tooth, which meshes with the adjusting gear for transmission.

[0011] The adjustment mechanism is located at the center of one end face of the adjustment gear, and is used to drive the adjustment gear to rotate so that the height of the child seat can be adjusted.

[0012] The locking mechanism is located on the other end face of the adjusting gear and connected to the adjusting mechanism. It is used to lock the adjusting gear so that the height of the child seat is fixed.

[0013] Optionally, in the rotary child seat support leg according to the present invention, the adjustment mechanism includes a handle and a hexagonal base, a hexagonal hole is provided at the center of the adjustment gear, the hexagonal base is disposed in the hexagonal hole, the handle is connected to the hexagonal base, and the handle can drive the hexagonal base and the adjustment gear to rotate.

[0014] Optionally, in the rotary child seat support leg according to the present invention, the handle includes a handle portion, a support shaft, and a central rod. A through hole is provided at the center of the hexagonal base. One end of the central rod is connected to the center of the handle portion, and the other end extends into the through hole and is connected to the locking mechanism. The support shaft is disposed on both sides of the handle portion and is symmetrically arranged relative to the central rod.

[0015] The hexagonal base has multiple grooves on one end facing the handle, and the support shaft is embedded in the grooves and slidably connected by a support pin.

[0016] Optionally, in the rotary child seat support leg according to the present invention, the hexagonal base is further provided with a circumferentially protruding skirt at one end away from the handle portion, and a limiting groove that cooperates with the skirt is recessed on the inner side of the hexagonal hole, so that the hexagonal base is restricted within the hexagonal hole.

[0017] Optionally, in the rotary child seat support leg according to the present invention, the locking mechanism includes a first push rod, a second push rod, a first rotating plate, a second rotating plate, and a locking rod. The first push rod is slidably connected in the through hole and abuts against the intermediate rod. One end of the second push rod is slidably connected in the through hole and abuts against the first push rod, and the other end passes through the bottom surface of the hexagonal hole and is provided with a connecting rod bent into a vertical shape.

[0018] The first rotating plate and the second rotating plate are provided with a rotating joint for rotational connection along the width direction. The rotating joint is fixed on the fixed leg and located on the side of the gear teeth near the moving leg. One end of the first rotating plate is rotatably connected to one end of the second rotating plate by a locking buckle. The other end of the first rotating plate is rotatably connected to the connecting rod. The end of the second rotating plate away from the first rotating plate is rotatably connected to the locking rod. The locking rod faces the end face of the adjusting gear, and the end face of the adjusting gear is provided with a plurality of locking holes that cooperate with the locking rod. When the handle is pressed, the locking rod can be pulled out from the locking holes. When the handle is pulled up, the locking rod can be inserted into different locking holes to lock the adjusting gear.

[0019] Optionally, in the rotary child seat support leg according to the present invention, the fixed leg is further provided with a guide rod, the guide rod is parallel to the rotary joint, and the end of the guide rod is provided with a guide ring, the guide ring being sleeved on the locking rod so that the locking rod is precisely aligned with the locking hole.

[0020] Optionally, in the rotary child seat support leg according to the present invention, both ends of the first rotating plate and the second rotating plate are further provided with waist-shaped holes, and the connecting rod, the locking mechanism and the rotating part of the locking rod are respectively sleeved in the corresponding waist-shaped holes.

[0021] Optionally, in the rotary child seat support leg according to the present invention, the first push rod includes a stop plate, a first slide rod, and a push rod body. A first fixing plate is provided in the through hole of the hexagonal base, and a first through hole is provided on the first fixing plate. The first slide rod is slidably connected in the first through hole. The stop plate is disposed at one end of the first slide rod and abuts against the intermediate rod. The push rod body is disposed at the other end of the first slide rod and abuts against the second push rod. A first spring is also provided between the stop plate and the first fixing plate. The first spring is sleeved on the first slide rod so that the handle is reset when no force is applied.

[0022] Optionally, in the rotary child seat support leg according to the present invention, the end of the second push rod away from the bending part is further provided with a limiting boss, and a second spring is further provided between the limiting boss and the bottom surface of the hexagonal hole. The second spring is sleeved on the second push rod, and the second spring cooperates with the first spring to make the handle quickly reset, and the locking rod quickly locks the adjusting gear.

[0023] Optionally, in the rotary child seat support leg according to the present invention, the hexagonal base is further provided with a side hole perpendicular to the through hole. A third push rod is provided in the side hole. The third push rod includes a fixed rod, a second sliding rod, and a moving rod. A second fixed plate is provided in the side hole. A second through hole is provided on the second fixed plate. The second sliding rod is slidably connected in the second through hole. The fixed rod is disposed at one end of the second sliding rod and is opposite to one of the inner sidewalls of the hexagonal hole. The moving rod is disposed at the other end of the second sliding rod and is opposite to the first push rod. The push rod body of the first push rod has an inclined surface facing the end of the moving rod, and the end of the moving rod has an arc surface structure, so that when the first push rod slides toward the second push rod, the second push rod moves toward the inner sidewall of the hexagonal hole and can be engaged in the limiting groove of the hexagonal hole.

[0024] The rotary child seat support leg disclosed in this invention achieves height adjustment and locking via a handle, gear and rack mechanism, rotary joint, and guide rail and groove mechanism. This enables convenient adjustment of the child seat's posture and position. Proper adjustment of the child seat also plays a beneficial role in child protection. The adjustment mechanism, composed of the handle and hexagonal base, allows the adjustment gear to rotate effectively. The locking mechanism, composed of the first and second rotating plates, effectively locks the adjustment gear. Combined with the first and second push rods, the adjustment mechanism and locking mechanism are connected, effectively achieving stepless adjustment of the child seat support leg—meaning it can be adjusted without locking and locked without adjustment. This improves seat stability and allows the support leg to fit more closely to the floor, enhancing compatibility.

[0025] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0027] Figure 1 This is a front structural diagram of the knob-type child seat support leg disclosed in this invention;

[0028] Figure 2 This is a schematic diagram of the rear structure of the knob-type child seat support leg disclosed in this invention;

[0029] Figure 3 This is an exploded view of the knob-type child seat support leg disclosed in this invention;

[0030] Figure 4 This is a cross-sectional view of the hexagonal base disclosed in this invention;

[0031] Figure 5 This is a schematic diagram showing the connection between the adjusting mechanism and the locking mechanism disclosed in this invention;

[0032] Figure 6 This is a schematic diagram of the structure of the first push rod disclosed in this invention;

[0033] Figure 7 This is a cross-sectional view of the third push rod disclosed in this invention;

[0034] Figure 8 This is a schematic diagram of the locking portion of the locking mechanism disclosed in this invention;

[0035] Figure 9 This is a schematic diagram illustrating the use of the locking rod and adjusting gear disclosed in this invention;

[0036] Figure 10 This is another structural schematic diagram of the locking portion of the locking mechanism disclosed in this invention;

[0037] Figure 11 This refers to the height adjustment device for the support leg of a child seat in the existing technology.

[0038] Explanation of reference numerals in the attached drawings: 1-Fixed leg; 2-Moving leg; 3-Gear tooth; 4-Adjusting gear; 41-Locking hole; 42-Cap; 43-Hexagonal hole; 5-Hexagonal base; 51-Groove; 52-Skirt; 53-Through hole; 54-Side hole; 55-First fixing plate; 56-Second fixing plate; 6-Handle handle; 61-Handle part; 62-Support shaft; 63-Intermediate rod; 64-Support pin; 7-Locking mechanism; 71-First push rod; 711-Butt plate; 712- 713-Push rod body; 714-First spring; 72-Second push rod; 721-Limiting boss; 722-Connecting rod; 723-Second spring; 73-Oval hole; 74-First rotating plate; 75-Second rotating plate; 76-Locking rod; 77-Rotating pair; 771-Connecting lever; 78-Guide rod; 781-Guide ring; 79-Lock; 8-Third push rod; 81-Third spring; 82-Fixing rod; 83-Moving rod; 84-Second slide rod. Detailed Implementation

[0039] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0040] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0041] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0042] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0043] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0044] according to Figures 1 to 10 As shown, the present invention provides a knob-type child seat support leg, including an adjustment gear 4, a support leg, an adjustment mechanism, and a locking mechanism 7.

[0045] The support leg is located at the bottom of the child seat and consists of a fixed leg 1 and a movable leg 2 formed in one piece. The movable leg 2 has a tooth 3 on one side, which meshes with the adjusting gear 4 for transmission.

[0046] The adjustment mechanism is located at the center of one end face of the adjustment gear 4, and it is used to drive the adjustment gear 4 to rotate so that the height of the child seat can be adjusted.

[0047] The locking mechanism 7 is located on the other end face of the adjusting gear 4 and is connected to the adjusting mechanism. It is used to lock the adjusting gear 4 so that the height of the child seat is fixed.

[0048] Furthermore, the adjustment mechanism includes a handle 6 and a hexagonal base 5. A hexagonal hole 43 is provided at the center of the adjustment gear 4, and the hexagonal base 5 is disposed within the hexagonal hole 43. The handle 6 is connected to the hexagonal base 5, and the handle 6 can drive the hexagonal base 5 and the adjustment gear 4 to rotate. In this embodiment, the hexagonal base 5 and the hexagonal hole 43 are tightly fitted, thereby ensuring that the hexagonal base 5 can drive the adjustment gear 4 to rotate. Additionally, during installation, a cover 42 is provided at the bottom of the hexagonal hole 43. The cover 42 can be used to rotatably connect the adjustment gear 4 to the side of the support leg to ensure that the gear teeth 3 between the adjustment gear 4 and the moving leg 2 mesh.

[0049] Furthermore, the handle 6 includes a handle portion 61, a support shaft 62, and a central rod 63. A through hole 53 is provided at the center of the hexagonal base 5. One end of the central rod 63 is connected to the center of the handle portion 61, and the other end extends into the through hole 53 and connects to the locking mechanism 7. The support shaft 62 is arranged on both sides of the handle portion 61, symmetrically with respect to the central rod 63. The end of the hexagonal base 5 facing the handle portion 61 also has multiple grooves 51. The support shaft 62 is embedded in the grooves 51 and slidably connected by a support pin 64. In implementation, the support pin 64 connects the support rod to the grooves 51 on the hexagonal base 5 to prevent the handle 6 from falling off. Simultaneously, the grooves 51 guide and restrict the movement of the handle 6. In the unlocked state, the support shaft 62 moves towards the groove 51; in the locked state, the end of the support shaft 62 is not at the bottom of the groove 51.

[0050] Furthermore, the hexagonal base 5 is provided with a circumferentially protruding skirt 52 at the end away from the handle part 61. The inner side of the hexagonal hole 43 is recessed with a limiting groove (not shown in the figure) that cooperates with the skirt 52, so that the hexagonal base 5 is restricted within the hexagonal hole 43 to prevent the hexagonal base 5 from disengaging from the adjusting gear 4, and the skirt 52 has a vertical movement space within the limiting groove.

[0051] Furthermore, the locking mechanism 7 includes a first push rod 71, a second push rod 72, a first rotating plate 74, a second rotating plate 75, and a locking rod 76. The first push rod 71 is slidably connected in the through hole 53 and abuts against the intermediate rod 63. One end of the second push rod 72 is slidably connected in the through hole 53 and abuts against the first push rod 71, while the other end passes through the bottom surface of the hexagonal hole 43 and is provided with a connecting rod 722 bent into a vertical shape.

[0052] The first rotating plate 74 and the second rotating plate 75 are provided with a rotating joint 77 rotatably connected along the width direction. The rotating joint 77 is fixed on the fixed leg 1 and located on the side of the gear tooth 3 near the moving leg 2. One end of the first rotating plate 74 is rotatably connected to one end of the second rotating plate 75 through a latch 79. The other end of the first rotating plate 74 is rotatably connected to the connecting rod 722. The end of the second rotating plate 75 away from the first rotating plate 74 is rotatably connected to the locking rod 76. The locking rod 76 faces the end face of the adjusting gear 4, and the end face of the adjusting gear 4 is provided with a plurality of locking holes 41 that cooperate with the locking rod 76. When the handle 6 is pressed, the locking rod 76 can be pulled out from the locking holes 41. When the handle 6 is pulled up, the locking rod 76 can be inserted into different locking holes 41 so that the adjusting gear 4 is locked.

[0053] In this embodiment, the downward pressure of the handle 6 pushes the hexagonal base 5 downward until the skirt 52 is engaged with the lower edge of the limiting groove in the hexagonal hole 43 of the adjusting gear 4. Simultaneously, the downward pressure of the middle rod 63 of the handle 6 pushes the first push rod 71 downward. Due to the pressure of the handle, the hexagonal base 5 moves downward, further pushing the second push rod 72 axially a certain distance. Both the first rotating plate 74 and the second rotating plate 75 are fixed to the fixed leg 1 via a rotating joint 77. Therefore, both the first rotating plate 74 and the second rotating plate 75 can only rotate around their corresponding rotating joints 77. When the second push rod 72 pushes one end of the first rotating plate 74, the other end of the first rotating plate 74 rotates accordingly, causing the second rotating plate 75 to rotate accordingly. Finally, this causes the end of the locking rod 76 to rotate, disengaging the locking rod 76 from the locking hole 41, thus unlocking it. When locking, the second rotating plate 75 presses the locking rod 76 down towards the adjusting gear 4, inserting the locking rod 76 into the locking hole 41, thus locking the adjusting gear 4.

[0054] Furthermore, in implementation, since the locking rod 76 is rotatably connected to the second rotating plate 75, in order to ensure that the locking rod 76 can accurately enter the corresponding locking hole 41, the present invention also provides a guide rod 78 on the fixed leg 1. The guide rod 78 is parallel to the rotating pair 77, and the end of the guide rod 78 is provided with a guide ring 781, which is sleeved on the locking rod 76 so that the locking rod 76 corresponds precisely to the locking hole 41. In addition, the locking holes 41 of the present invention are arranged in a ring array on the cross-section of the adjusting gear 4 with the center of the adjusting gear 4 as the center. The locking holes 41 can be blind holes or through holes 53.

[0055] Furthermore, both ends of the first rotating plate 74 and the second rotating plate 75 are provided with oblong holes 73, and the rotating parts of the connecting rod 722, the lock, and the locking rod 76 are respectively fitted into the corresponding oblong holes 73. In implementation, since the positions of the first rotating plate 74 and the second rotating plate 75 are restricted by the rotary joint 77, when they rotate, there will inevitably be some adjustment in the horizontal distance. In order to compensate for the distance deviation caused by the rotation, corresponding oblong holes 73 are provided on the first rotating plate 74 and the second rotating plate 75 so that when they rotate, the connecting rod 722, the latch 79, and the locking rod 76 of the second push rod 72 will not be offset.

[0056] Furthermore, the first push rod 71 includes a stop plate 711, a first slide rod 712, and a push rod body 713. A first fixing plate 55 is provided within the through hole 53 of the hexagonal base 5. The first fixing plate 55 has a first through hole. The first slide rod 712 is slidably connected within the first through hole. The stop plate 711 is located at one end of the first slide rod 712 and abuts against the intermediate rod 63. The push rod body 713 is located at the other end of the first slide rod 712 and abuts against the second push rod 72. A first spring 714 is also provided between the stop plate 711 and the first fixing plate 55. The first spring 714 is sleeved on the first slide rod 712 so that the handle 6 returns to its original position when no force is applied. In implementation, the position of the first push rod 71 is restricted by the first fixing plate 55, allowing it to slide only within the through hole 53.

[0057] Furthermore, the end of the second push rod 72 furthest from the bend is provided with a limiting boss 721. The shape of the bottom of the hexagonal base 5 matches the limiting boss 721 to restrict the position of the second push rod 72. A second spring 723 is also provided between the limiting boss 721 and the bottom surface of the hexagonal hole 43. The second spring 723 is sleeved on the second push rod 72. The second spring 723 cooperates with the first spring 714 to allow the handle 6 to quickly return to its original position, and the locking rod 76 to quickly lock the adjusting gear 4. In this configuration, the bottom surface of the hexagonal hole 43 is provided with a cover 42, and the second spring 723 can be positioned between the cover 42 and the limiting boss 721.

[0058] In this embodiment, when the handle part 61 is pulled upward, the force exerted by the middle rod 63 of the handle handle 6 on the first push rod 71 is weakened, and then the first push rod 71 is axially pulled back under the action of the first spring 714. Since the first fixing plate 55 is integrated with the hexagonal base 5 of the handle, the force compressed by the first spring 714 during operation is released, and the first push rod 71 and the second push rod 72 can move axially. Since the first push rod 71 is axially pulled back, the hexagonal base 5 can move axially within the limiting groove of the adjusting gear 4. The pressure exerted by the hexagonal base 5 on the second push rod 72 disappears, and the handle handle 6 retracts. The second push rod 72 is axially pulled back by the elastic force released by the second spring 723.

[0059] Furthermore, the hexagonal base 5 is also provided with a side hole 54 perpendicular to the through hole 53. A third push rod 8 is provided in the side hole 54. The third push rod 8 includes a fixed rod 82, a second sliding rod 84, and a moving rod 83. A second fixed plate 56 is provided in the side hole 54. A second through hole is provided on the second fixed plate 56. The second sliding rod 84 is slidably connected in the second through hole. The fixed rod 82 is located at one end of the second sliding rod 84 and is opposite to one of the inner sidewalls of the hexagonal hole 43. The moving rod 83 is located at the other end of the second sliding rod 84 and is opposite to the first push rod 71. The end of the push rod body 713 of the first push rod 71 facing the moving rod 83 is inclined, and the end of the moving rod 83 is arc-shaped, so that when the first push rod 71 slides toward the second push rod 72, the second push rod 72 moves toward the inner sidewall of the hexagonal hole 43 and can be locked into the limiting slot of the hexagonal hole 43. A third spring 81 is also provided between the moving rod 83 and the second fixed plate 56. The third spring 81 is sleeved on the second sliding rod 84 so that when the handle 6 is not under force, the third push rod 8 can quickly return to its original position, and the hexagonal base 5 can retract to the upper edge of the limit slot.

[0060] In this embodiment, due to the pressing force of the handle 61, the hexagonal base 5 moves downward, further pushing the second push rod 72 to move axially a certain distance. Under the action of the inclined surface of the first push rod 71 and the arc surface of the third push rod 8, the third push rod 8 is pushed forward into the limiting slot of the adjusting gear 4, realizing the fixed connection between the hexagonal base 5 and the adjusting gear 4. Lifting the adjusting gear 4 and rotating the handle at this time can drive the adjusting gear 4 to rotate effectively.

[0061] For example Figure 10 As shown, in order to improve the connection strength between the locking mechanism 7 and the fixed leg 1, the rotary joint 77 and the guide rod 78 are also fixedly connected by a connecting lever 771, so that they form an integral structure.

[0062] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A knob-type child seat support leg, characterized in that, Includes adjusting gears, support legs, adjusting mechanism, and locking mechanism; The support leg is located at the bottom of the child seat and consists of an integrally formed fixed leg and a movable leg. One side of the movable leg is provided with a gear tooth, which meshes with the adjusting gear for transmission. The adjustment mechanism is located at the center of one end face of the adjustment gear, and is used to drive the adjustment gear to rotate so that the height of the child seat can be adjusted. The locking mechanism is disposed on the other end face of the adjusting gear and connected to the adjusting mechanism. It is used to lock the adjusting gear so that the height of the child seat is fixed. The adjustment mechanism includes a handle and a hexagonal base. The center of the adjustment gear is provided with a hexagonal hole, and the hexagonal base is disposed in the hexagonal hole. The handle is connected to the hexagonal base, and the handle can drive the hexagonal base and the adjustment gear to rotate. The handle includes a handle portion, a support shaft, and a central rod. A through hole is provided at the center of the hexagonal base. One end of the central rod is connected to the center of the handle portion, and the other end extends into the through hole and is connected to the locking mechanism. The support shaft is arranged on both sides of the handle portion and is symmetrically arranged with respect to the central rod. The hexagonal base is provided with multiple grooves at one end facing the handle, and the support shaft is embedded in the grooves and slidably connected by a support pin. The hexagonal base is further provided with a circumferentially protruding skirt at one end away from the handle, and a limiting groove that mates with the skirt is recessed on the inner side of the hexagonal hole, so that the hexagonal base is confined within the hexagonal hole; The locking mechanism includes a first push rod, a second push rod, a first rotating plate, a second rotating plate, and a locking rod. The first push rod is slidably connected in the through hole and abuts against the intermediate rod. One end of the second push rod is slidably connected in the through hole and abuts against the first push rod, and the other end passes through the bottom surface of the hexagonal hole and is provided with a connecting rod bent into a vertical shape. The first rotating plate and the second rotating plate are provided with a rotating joint for rotational connection along the width direction. The rotating joint is fixed on the fixed leg and located on the side of the gear teeth near the moving leg. One end of the first rotating plate is rotatably connected to one end of the second rotating plate by a locking buckle. The other end of the first rotating plate is rotatably connected to the connecting rod. The end of the second rotating plate away from the first rotating plate is rotatably connected to the locking rod. The locking rod faces the end face of the adjusting gear, and the end face of the adjusting gear is provided with a plurality of locking holes that cooperate with the locking rod. When the handle is pressed, the locking rod can be pulled out from the locking holes. When the handle is pulled up, the locking rod can be inserted into different locking holes to lock the adjusting gear.

2. The knob-type child seat support leg according to claim 1, characterized in that, The fixed leg is also provided with a guide rod, which is parallel to the rotary joint, and the end of the guide rod is provided with a guide ring, which is sleeved on the locking rod so that the locking rod and the locking hole are precisely aligned.

3. The knob-type child seat support leg according to claim 2, characterized in that, Both ends of the first rotating plate and the second rotating plate are provided with waist-shaped holes, and the rotating parts of the connecting rod, the lock and the locking rod are respectively fitted into the corresponding waist-shaped holes.

4. The knob-type child seat support leg according to claim 3, characterized in that, The first push rod includes a stop plate, a first slide rod, and a push rod body. A first fixing plate is provided in the through hole of the hexagonal base. A first through hole is provided on the first fixing plate. The first slide rod is slidably connected in the first through hole. The stop plate is provided at one end of the first slide rod and abuts against the intermediate rod. The push rod body is provided at the other end of the first slide rod and abuts against the second push rod. A first spring is also provided between the stop plate and the first fixing plate. The first spring is sleeved on the first slide rod so that the handle is reset when no force is applied.

5. The knob-type child seat support leg according to claim 4, characterized in that, The second push rod is provided with a limiting boss at the end away from the bending part. A second spring is provided between the limiting boss and the bottom surface of the hexagonal hole. The second spring is sleeved on the second push rod. The second spring cooperates with the first spring to make the handle quickly return to its original position, and the locking rod quickly locks the adjusting gear.

6. The knob-type child seat support leg according to claim 1, characterized in that, The hexagonal base also has a side hole perpendicular to the through hole. A third push rod is provided in the side hole. The third push rod includes a fixed rod, a second sliding rod, and a moving rod. A second fixed plate is provided in the side hole. The second fixed plate has a second through hole. The second sliding rod is slidably connected in the second through hole. The fixed rod is located at one end of the second sliding rod and is opposite to one of the inner sidewalls of the hexagonal hole. The moving rod is located at the other end of the second sliding rod and is opposite to the first push rod. The push rod body of the first push rod has an inclined surface facing the end of the moving rod, and the end of the moving rod has an arc surface structure, so that when the first push rod slides toward the second push rod, the second push rod moves toward the inner sidewall of the hexagonal hole and can be locked into the limiting groove of the hexagonal hole.

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