Child chair support wheel with brake function

Abstract

The utility model relates to a children's chair supporting wheel with brake function, characterized in that it comprises a shell, a cavity is arranged in the shell, an opening is arranged on the shell and communicates with the cavity, a liftable footrest is arranged at the opposite position of the opening, a rotatable wheel body is arranged on the shell, a lock groove is arranged on the inner side of the wheel body, a lock block capable of being clamped into the lock groove is arranged in the cavity, the lock block is matched with the lock groove, a transmission assembly is arranged in the cavity, the lock block is driven to be pushed out or retracted under the action of the transmission assembly through treading the footrest, and the locking or unlocking of the wheel body is realized. The utility model has the following advantages and effects: the supporting wheel can be actively unlocked or locked to facilitate the movement of the children's chair when the user leans on the seat.

Description

Technical Field

[0001] This utility model relates to the field of children's chair technology, specifically to a children's chair support wheel with a braking function. Background Technology

[0002] A children's chair, also known as a study chair, is a type of seating used to accompany children during their studies and plays a very important role in their growth and learning process. Some children's chairs are equipped with casters to facilitate movement, and to ensure safety, a braking mechanism is added to lock the casters.

[0003] For example, Chinese patent document CN212124744U discloses an adjustable brake chair wheel. It includes a wheel frame assembly, a wheel axle horizontally mounted through the wheel frame assembly, traveling wheels fixedly mounted at both ends of the wheel axle, and a pivot for connecting to the seat legs. The wheel frame assembly includes an arc-shaped wheel cover and a support column located below the wheel cover. A brake groove is provided at the end of the support column away from the wheel cover, and a brake element is disposed within the brake groove. A compression spring is disposed between the brake element and the support column. The wheel axle passes through the brake element and the support column. The traveling wheels are located on both sides of the support column, and the brake element is stepped.

[0004] In the above technical solution, the wheels are locked by the gravity applied by the user when leaning against the seat, so that the seat will not move at will. However, the gravity self-locking method will prevent the child chair from moving normally when the user leans against the seat. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a child chair support wheel with a braking function, which can actively unlock or lock the support wheel so that the child chair can be moved when the user leans on the seat.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a child chair support wheel with a braking function, comprising a housing, a cavity inside the housing, an opening communicating with the cavity on the housing, a height-adjustable foot pedal located opposite the opening in the cavity, a rotatable wheel on the housing, a locking groove inside the wheel, a locking block that can be engaged with the locking groove in the cavity, the locking block being adapted to the locking groove, and a transmission component in the cavity. By stepping on the foot pedal, the locking block is pushed out or retracted under the action of the transmission component, thereby locking or unlocking the wheel.

[0007] The present invention is further configured such that: the transmission assembly includes a base and two spaced-apart movable blocks; the base is fixed to the foot pedal at the opening; a first return spring is provided between the two movable blocks; one side of the locking block is fixed to the outside of the movable block; by stepping on the foot pedal, the base is moved downward to push the movable block back; when the foot pedal moves upward, the first return spring pushes the movable block out; a locking module is provided between the base and the housing; the locking module is used to lock the position of the base when the locking block retracts.

[0008] The present invention is further configured such that: the locking module includes a transmission rod, one end of which is rotatably connected to the housing, and the other end is provided with a guide rod; the base is provided with a connecting groove, one end of which is provided with a guide groove communicating with the connecting groove; a guide block integrally formed with the base is provided in the guide groove; a guide channel is formed between the outer periphery of the guide block and the guide groove; a guide sidewall and a locking port are respectively provided on the lower and upper outer peripheries of the guide block; when the base moves down, the guide rod contacts the guide sidewall and enters the locking port along the guide channel to form a limiting fit between the two; when the base moves down again, the guide rod disengages from the locking port and re-enters the connecting groove along the guide channel.

[0009] The present invention is further configured such that: a positioning pin is provided in the cavity and integrally formed with the housing; a second return spring is fixedly fitted around the outer periphery of the positioning pin; a receiving groove is provided on the base opposite to the second return spring; and one side of the second return spring extends into the receiving groove.

[0010] The present invention is further configured such that the height of the top of the movable block decreases sequentially from the inner side to the outer side to form an inclined coupling sidewall.

[0011] The present invention is further configured such that the locking groove is multiple and evenly distributed around the circumference.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] Because a transmission component is installed inside the cavity, stepping on the foot pedal causes the locking block to be pushed out or retracted by the transmission component. Once the locking block is pushed out and inserted into the locking groove, the wheel can be locked. Once the locking block is retracted and disengaged from the locking groove, the wheel can rotate normally, thus unlocking the wheel. Therefore, stepping on the foot pedal allows the wheel to be actively unlocked or locked, making it convenient for the user to move the child chair while leaning on the seat. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is an exploded view of the present invention;

[0016] Figure 3 This is a schematic cross-sectional view of the present invention.

[0017] Figure 4 This is a schematic diagram of the wheel body in this utility model.

[0018] In the figure: 1. Housing; 2. Cavity; 3. Foot pedal; 4. Wheel; 41. Lock groove; 5. Lock block; 61. Movable block; 611. Coupling sidewall; 62. Base; 621. Connecting groove; 622. Guide groove; 623. Guide block; 623a. Guide sidewall; 623b. Receiving groove; 624. First return spring; 63. Transmission rod; 641. Guide rod; 642. Positioning pin; 7. Second return spring; 8. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] like Figures 1 to 4As shown, this utility model discloses a child chair support wheel with a braking function, including a housing 1, a connecting shaft for connecting the child chair legs on the housing 1, a cavity 2 inside the housing 1, an opening on the housing 1 communicating with the cavity 2, a height-adjustable foot pedal 3 located opposite the opening in the cavity 2, a rotatable wheel 4 on the housing 1, a locking groove 41 inside the wheel 4, and a locking block 5 inside the cavity 2 that can be engaged with the locking groove 41. The locking block 5 is adapted to the locking groove 41 to ensure that the locking block 5 is engaged with the locking groove 41. The latter two constitute the stability of the limiting fit. The cavity 2 is equipped with a transmission component. By stepping on the foot pedal 3, the locking block 5 is driven to push out or retract under the action of the transmission component. After the locking block 5 is pushed out and inserted into the locking groove 41, the wheel 4 can be locked. After the locking block 5 is retracted and disengaged from the locking groove 41, the wheel 4 can rotate normally, thus unlocking the wheel 4. Therefore, by stepping on the foot pedal 3, the wheel 4 can be actively unlocked or locked, so that the child chair can be moved when the user leans on the seat.

[0022] In this embodiment, the transmission assembly includes a base 62 and two spaced movable blocks 61. The base 62 is fixedly embedded in the foot pedal 3 at the opening. A first return spring 63 is provided between the two movable blocks 61. Corresponding grooves are provided on the opposite sides of the two movable blocks 61. The two ends of the first return spring 63 are respectively embedded in the two grooves. One side of the locking block 5 is fixed to the outside of the movable block 61. By stepping on the foot pedal 3, the base 62 is moved down to push the movable block 61 to retract, thereby driving the locking block 5 to disengage from the locking groove 41. When the foot pedal 3 moves up, the first return spring 63, which was compressed when the movable block 61 retracted, can push the movable block 61 out, driving the locking block 5 to insert into the corresponding locking groove 41. The locking groove 41 is provided in multiple ways and evenly distributed around the circumference, so that the locking groove 41 corresponds to the locking block 5 when the wheel 4 rotates at different angles, thus facilitating the insertion or disengagement of the locking block 5 into or out of the locking groove 41.

[0023] Specifically, the structure that facilitates the retraction of the movable block 61 by lowering the base 62 is such that the height of the movable block 61 decreases sequentially from the inner side to the outer side at the top of the movable block 61 to form an inclined coupling sidewall 611. Therefore, during the downward movement of the base 62, the base 62 can gradually come into full contact with the movable block 61 through the guidance of the coupling sidewall 611, thereby facilitating the retraction of the movable block 61 and improving the smoothness of unlocking or locking the wheel 4.

[0024] In addition, a locking module is provided between the base 62 and the housing 1. The locking module is used to lock the position of the base 62 when the locking block 5 is retracted, thereby preventing the movable block 61 from moving accidentally and improving the stability when unlocking or locking the wheel 4.

[0025] Specifically, the locking module includes a transmission rod 641, one end of which is rotatably connected to the housing 1, and the other end is provided with a guide rod 642, which is vertically fixed to one side of the transmission rod 641. A connecting groove 621 is provided on the base 62, and a guide groove 622 communicating with the connecting groove 621 is provided at one end of the connecting groove 621. A guide block 623 integrally formed with the base 62 is provided within the guide groove 622, and a guide channel is formed between the outer periphery of the guide block 623 and the guide groove 622. A guide sidewall 623a is provided on the lower outer periphery of the guide block 623, and a locking port 623b is provided on the upper outer periphery. By stepping on the foot pedal 3, the base 62 moves downward. As the base 62 moves downward, the guide rod 642 moves upward relative to the base 62, thus engaging with the guide sidewall. When the guide rod 623a contacts the base 62, it can enter the locking slot 623b clockwise along the guide channel under the push of the guide side wall 623a, so as to form a limiting fit between the two, thereby locking the base 62. This ensures that the locking block 5 can stably disengage from the locking groove 41. When it is necessary to reinsert the locking block 5 into the locking groove 41, the base 62 is moved down by stepping on the foot pedal 3 again. At this time, the guide rod 642 can move up relative to the base 62 again, so that it can disengage from the locking slot 623b. The base 62 can also be reset and moved up. In this way, the guide rod 642 can re-enter the communicating groove 621 clockwise along the guide channel. At this time, the push on the movable block 61 can be released, so that under the reset action of the first reset spring 63, the locking block 5 is driven to re-insert into the locking groove 41.

[0026] The structure for the base 62 to reset and move upward is as follows: a positioning pin 7 is provided in the cavity 2 and is integrally formed with the housing 1. A second reset spring 8 is fixedly fitted around the outer periphery of the positioning pin 7. The base 62 is provided with a receiving groove 624 opposite to the second reset spring 8. One side of the second reset spring 8 extends into the receiving groove 624. Therefore, when the base 62 moves downward, the second reset spring 8 can be compressed. When the downward force on the base 62 is released, the compressed second reset spring 8 can push the base 62 to reset.

[0027] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A child chair support wheel with a braking function, characterized in that, The device includes a housing with a cavity inside. The housing has an opening communicating with the cavity. A height-adjustable foot pedal is located in the cavity opposite to the opening. The housing has a rotatable wheel with a locking groove inside. A locking block that can be engaged with the locking groove is located in the cavity. The locking block is adapted to the locking groove. A transmission component is located in the cavity. By stepping on the foot pedal, the locking block is pushed out or retracted under the action of the transmission component to lock or unlock the wheel.

2. A child chair support wheel with braking function according to claim 1, characterized in that, The transmission assembly includes a base and two spaced-apart movable blocks. The base is fixed to the foot pedal at the opening. A first return spring is provided between the two movable blocks. One side of the locking block is fixed to the outside of the movable block. Stepping on the foot pedal moves the base downward to push the movable block back. When the foot pedal moves upward, the first return spring pushes the movable block out. A locking module is provided between the base and the housing. The locking module is used to lock the position of the base when the locking block retracts.

3. A child chair support wheel with braking function according to claim 2, characterized in that, The locking module includes a transmission rod, one end of which is rotatably connected to the housing, and the other end is provided with a guide rod. The base is provided with a connecting groove, and one end of the connecting groove is provided with a guide groove communicating with the connecting groove. A guide block integrally formed with the base is provided in the guide groove. A guide channel is formed between the outer periphery of the guide block and the guide groove. The lower outer periphery and the upper outer periphery of the guide block are respectively provided with guide sidewalls and locking ports. When the base moves down, the guide rod contacts the guide sidewall and enters the locking port along the guide channel to form a limiting fit between the two. When the base moves down again, the guide rod disengages from the locking port and re-enters the connecting groove along the guide channel.

4. A child chair support wheel with braking function according to claim 3, characterized in that, The cavity is provided with a positioning pin integrally formed with the housing. A second return spring is fixedly fitted around the outer periphery of the positioning pin. The base is provided with a receiving groove opposite to the second return spring, and one side of the second return spring extends into the receiving groove.

5. A child chair support wheel with braking function according to claim 2, characterized in that, The height of the top of the movable block decreases sequentially from the inside to the outside to form an inclined coupling sidewall.

6. A child chair support wheel with braking function according to claim 1, characterized in that, The locking grooves are multiple and evenly distributed around the circumference.

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