CN103799765B - Foldable high chair - Google Patents

Abstract

A foldable high chair comprises a supporting leg frame and a seat assembly connected to the supporting leg frame, wherein the supporting leg frame comprises a front leg frame and a rear leg frame, the upper ends of the front leg frame and the rear leg frame are pivoted with each other, the front leg frame and the rear leg frame can be relatively close to each other to be folded, the seat assembly comprises a seat plate pivoted between the front leg frame and the rear leg frame and a backrest pivoted with the seat plate, the foldable high chair further comprises a backrest supporting device, the backrest supporting device comprises a connecting rod and an adjusting seat, the adjusting seat is arranged on the supporting leg frame, the connecting rod is arranged on the rear side of the backrest, the lower end of the connecting rod is detachably connected with the adjusting seat, and when the lower end of the connecting rod is separated from the adjusting seat, the backrest can pivot relative to the seat plate.

Description

foldable high chair

technical field

The invention relates to a foldable high chair, in particular to a foldable high chair which is beneficial to be folded into a smaller volume.

Background technique

Children's high chairs are generally used to provide young children with meals to facilitate adults to feed young children. US Patent No. US2005/0242646A1 discloses a foldable high chair frame. The rear bracket is moved away from each other due to the rotation of the pivot joint for supporting and positioning on the ground, and the seat portion and the backrest pivotally connected with the front bracket and the rear bracket are launched for riding; The brackets move closer to each other due to the rotation of the pivot joints, and the seat part and the backrest part are folded closer to the direction opposite to the folding direction of the front and rear brackets. This folding method will occupy a larger volume, so that a larger storage space is required.

Contents of the invention

The purpose of the present invention is to provide a collapsible high chair which is different from the conventional structure and can reduce the occupied volume after being folded.

The foldable highchair of the present invention comprises a supporting frame and a seat assembly connected to the supporting frame, and the supporting frame includes a front frame and a rear frame whose upper ends are pivotally connected to each other and can be relatively close to each other. frame, the seat assembly includes a seat panel pivotally connected between the front frame and the rear frame and a backrest pivotally connected to the seat panel, and the foldable high chair also includes a backrest support device , the backrest support device includes a connecting rod and an adjustment seat, the adjustment seat is arranged on the supporting foot frame, the connecting rod is arranged on the rear side of the backrest and its lower end is detachably engaged with the adjustment seat, when the When the lower end of the connecting rod is separated from the adjustment seat, the backrest can pivot relative to the seat board.

Preferably, the adjustment seat has a first end adjacent to the front frame and a second end far away from the front frame, a plurality of positioning holes are defined between the first end and the second end, and a communication channel connecting the plurality of Adjustment slots for positioning holes.

Preferably, the adjustment groove is arranged on the upper edge of the plurality of positioning holes and communicates with the plurality of positioning holes. When the high chair is unfolded, the lower end of the connecting rod is inserted into one of the plurality of positioning holes. An optional positioning hole is provided to provide a specific angle of inclination of the backrest.

Preferably, the adjustment seat is arranged on the rear foot frame, and the back support device further includes a return spring, and the return spring is arranged between the connecting rod and the seat assembly.

Preferably, the second end of the adjustment seat is provided with a stop block, and the top surface of the stop block is higher than the bottom edge of the adjustment groove.

Preferably, the second end of the adjustment seat has a mounting hole, the stopper is accommodated in the installation hole and is elastically biased so that the top surface of the stopper is higher than the bottom edge of the adjustment slot.

Preferably, a guiding slope is formed on the top surface of the stop block.

Preferably, the lower end of the connecting rod protrudes to form a hook portion, and the inner side of the stop block is recessed to form a concave hole for the hook portion of the connecting rod to engage with.

Preferably, a limiting hole is formed above the recessed hole of the stop block.

Preferably, the connecting rod is an inverted U-shaped rod, and the back support device further includes an operating part, and the connecting rod is separated from the adjustment seat by a height direction displacement through the operating part in conjunction with the connecting rod.

Preferably, the operating member has a casing, the horizontal section of the connecting rod runs through the casing, and a guide groove for receiving the horizontal section of the connecting rod is defined on the side wall of the casing. The guiding groove has an upper edge and a lower edge in the height direction.

Preferably, when the lower end of the connecting rod abuts against the surface of the adjustment seat, the horizontal segment of the connecting rod is elastically biased to slide between the upper edge and the lower edge of the guiding groove.

Preferably, the backrest supporting device further includes a first return spring arranged on the backrest rear wall and a second return spring arranged between the backrest rear wall and the operating member housing, the first return spring A return spring and a second return spring respectively provide elastic return force to the connecting rod and the operating member.

The beneficial effects of the present invention are: to provide a different structural style from the past, through the jointable and detachable design of the connecting rod and the adjustment seat, when folded, the back rest and the seat plate are close to each other, and the front leg frame and the rear leg frame The frames are folded in the same direction, reducing the occupied volume after folding and reducing the storage space.

Description of drawings

Fig. 1 is a perspective view of the first preferred embodiment of the foldable high chair of the present invention;

Fig. 2 is a partial perspective view of the first preferred embodiment;

Fig. 3 is a partial perspective exploded view of the back support device of the first preferred embodiment;

Fig. 4 is a schematic cross-sectional view of the back support device in the state of high chair deployment;

Fig. 5 is a schematic cross-sectional view of the back support device of the first preferred embodiment;

Fig. 6 is a rear perspective schematic view of the back support device of the first preferred embodiment;

Figure 7 is a partial enlarged view of the first preferred embodiment;

Fig. 8 is a perspective view of the folded state of the foldable high chair of the first preferred embodiment;

9 and 10 are perspective views of the unfolding process of the foldable high chair of the first preferred embodiment;

Figure 11 and Figure 12 are schematic cross-sectional views of the first preferred embodiment when the back support device is deployed;

Fig. 13 is a schematic cross-sectional view of a stop block of the second preferred embodiment of the foldable high chair of the present invention;

Fig. 14 is a perspective view of the third preferred embodiment of the collapsible highchair of the present invention;

Fig. 15 is a three-dimensional exploded view of the back support device of the third preferred embodiment;

Fig. 16 is a schematic cross-sectional view of the third preferred embodiment of the collapsible highchair of the present invention when it is unfolded; and

Fig. 17 is a schematic cross-sectional view of the third preferred embodiment of the foldable high chair of the present invention from folding to unfolding.

detailed description

Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:

In the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 1 and FIG. 2 , the first preferred embodiment of the foldable highchair includes a support frame 1 , a seat assembly 2 , a dinner plate 3 , and a back support device 4 .

The supporting foot frame 1 includes a U-shaped front foot frame 11 and a U-shaped rear foot frame 12 whose upper ends are pivotally connected to each other and can be folded relatively close to each other, a pedal 13 arranged between the front foot frames 11, two respectively An armrest 14 is provided at the pivot joint between the front frame 11 and the rear frame 12 , and a seat tube 15 whose front and rear ends are pivotally connected to the front frame 11 and the rear frame 12 respectively.

The seat assembly 2 includes a seat panel 21 pivotally connected between the front frame 11 and the rear frame 12 , and a backrest 22 pivotally connected to the seat panel 21 . Both sides of the seat plate 21 are connected with the seat tube 15 pivotally connected between the upright rod sections 111, 121 of the front foot frame 11 and the rear foot frame 12 respectively, and the seat tube 15 is connected by the front and rear pipe sections (not shown in the figure) pivotally connected to each other. In the figure), one end of the front and rear pipe sections is pivotally connected to the upright rod sections 111, 121 of the front foot frame 11 and the rear foot frame 12 respectively, wherein the front pipe section is fixedly connected to the seat plate 21, and the rear pipe section is only connected to the other end of the front pipe section. One ends are pivotally connected to each other. The dinner tray 3 is detachably arranged on the upper surfaces of the two armrests 14 . When a young child sits on the seat assembly 2, both feet can step on the pedals 13, and the dining tray 3 can place related items for the young child to eat.

Referring to FIG. 2 , FIG. 3 and FIG. 4 , the backrest support device 4 enables the backrest 22 of the seat assembly 2 to adjust the inclination angle relative to the seat plate 21 or to fold it. The backrest supporting device 4 includes an inverted U-shaped connecting rod 41 arranged on the rear side of the backrest 22, and two straight rod sections 410 of the connecting rod 41 pass through bolts and are fixed on the cover plates 43 on both sides of the backwall of the backrest 22. Rear foot frame 12 movably extends, and is arranged on two adjustment seats 44 on the rear foot frame 12 and detachably engages, and a pair of back-moving springs 42 is sleeved on the two straight bar sections 410 respectively, and each back-moving spring 42 The lower end is connected and fixed to the corresponding cover plate 43 or the rear wall of the backrest 22 , and the upper end is connected and fixed to the corresponding straight section 410 of the connecting rod 41 so as to provide restoring elastic force when the connecting rod 41 is displaced relative to the backrest 22 . In this embodiment, each return spring 42 is a tension spring.

Each adjustment seat 44 has a first end 440 adjacent to the front foot frame 11 and a second end 441 far away from the front foot frame 11, a plurality of positioning holes 442 are defined between the first end 440 and the second end 441, and are located in a plurality of The height position of the positioning hole 442 is above and communicates with the adjustment slots 443 of the plurality of positioning holes 442 . In this embodiment, the number of positioning holes 442 is three, so that the position of the backrest 22 relative to the seat plate 21 can be changed between three different angles of inclination. In actual implementation, the number of positioning holes 442 can be increased or decreased depending on the actual situation. . In addition, in order to facilitate the user to adjust the angle of the backrest 22 , the backrest support device 4 further includes an operating member 45 sleeved on the horizontal section 412 of the connecting rod 41 . When wanting to adjust the angle of inclination of the backrest 22, you can hold the operating piece 45 and move it up to link the connecting rod 41, so that the lower ends of the two straight rod sections 410 of the connecting rod 41 move upwards out of the corresponding positioning holes 442 and move along the corresponding The adjustment groove 443 slides to another required positioning hole 442, and after the lower end of the two straight rod sections 410 of the connecting rod 41 moves to the appropriate positioning hole 442, the operating member 45 is released, so that the two straight rod sections 410 of the connecting rod 41 The lower ends are respectively engaged with the positioning holes 442 corresponding to the selection due to the restoring elastic force of the two restoring springs 42 . The user will know that the operating member 45 can be released, so that the two straight rod sections 410 of the connecting rod 41 are engaged with the corresponding positioning holes 442 due to the return elastic force of the corresponding two return springs 42, so that the seat plate 21 and the backrest 22 are in the same position. Change positioning between three different angles.

The second end 441 of each adjustment seat 44 has an installation hole 444 communicating with the adjustment groove 443 , a stop block 446 , and an elastic element 445 accommodated in the installation hole 444 and biasing the stop block 446 . When each stop block 446 is accommodated in the corresponding installation hole 444, the top surface of each stop block 446 is higher than the bottom edge of each adjustment groove 443, and when the two connecting rods 41 are respectively inserted into the adjustment seat 44, the stop The block 446 acts as a limit to the displacement stroke of the connecting rod 41 in the height direction. In more detail, when the position of the backrest 22 is adjusted between the first end 440 and the second end 441 of the two adjustment seats 44, the lower ends of the two straight sections 410 of the connecting rod 41 will not be higher than the upper ends of the two adjustment grooves 443 respectively. The surface, that is, the lower ends of the two straight bar sections 410 of the connecting rod 41 will not break away from the scope of the two adjustment grooves 443 respectively, so the connecting rod 41 will be affected by the two stoppers when moving to the second end 441 along the two adjustment grooves 443. The restriction of the block 446 will not break away from the corresponding positioning hole 442 or the adjustment slot 443 . Preferably, the lower ends of the two straight rod sections 410 of the connecting rod 41 respectively protrude to form a hook portion 411, and an inner side of each stop block 446 facing the adjustment groove 443 is recessed to form a hook portion 411 that can be connected with the corresponding connecting rod 41. Engagement recess 447 . Referring to Fig. 5, when the backrest 22 is adjusted to be close to the second end 441, the two concave holes 447 can respectively engage with the two hooks 411, thereby enhancing the restriction on the connecting rod 41 and preventing young children from sitting on the seat assembly 2, If adjust backrest 22 possible dangers. In addition, referring to FIG. 3 and FIG. 4 , the top surface of each stop block 446 is formed with a guide inclined surface 448 facing the outside of the adjustment seat 44, and the top surface of the stop block 446 is flush with the upper surface of the adjustment groove 443, so that each connection After the rod 41 is separated from the corresponding adjustment seat 44 , it is easier to slide into each connecting rod 41 to guide and slide into the corresponding adjustment seat 44 . This means that when the lower ends of the two straight sections 410 of the connecting rod 41 abut against the two guiding slopes 448 respectively, the lower ends of the two straight sections 410 of the connecting rod 41 can be guided into the two adjustment grooves 443 respectively. In this embodiment, each elastic element 445 is a compression spring.

It should be noted that Fig. 4, Fig. 5, Fig. 9 and Fig. 10 mainly illustrate the process of unfolding and collapsing the foldable high chair, so the dinner plate 3 is not shown (see Fig. 1). The relevant existing construction part of the high chair shown in the figure is also omitted and not described herein.

Referring to Figure 1, Figure 4 and Figure 5, when the high chair is unfolded, the front foot frame 11 and the rear foot frame 12 of the supporting foot frame 1 are far away from each other, and the seat tube 15 extends horizontally between the front foot frame 11 and the rear foot frame 12 and supports The seat plate 21 and the connecting rod 41 are placed in the required positioning holes 442 according to the needs of the user, so that the angle between the seat plate 21 and the backrest 22 is suitable for the needs of young children when riding. It should be noted that the positioning hole 442 adjacent to the second end 441 of the second adjustment seat 44 communicates with the concave hole 447 of the second stopper 446, so the concave hole 447 of the second stopper 446 can avoid the two The hook portion 411 is pulled up excessively by the user and disengages from the two adjustment slots 443 respectively.

Referring to Fig. 6 and Fig. 7, when the foldable high chair of the present invention is to be folded, the lock between the seat plate 21 and the supporting leg frame 1 is first released, and then the seat plate 21 is pulled upwards, and at the same time, the backrest is driven. The backrest 22 moves upwards, or directly pulls the backrest 22 to move upwards, driving the seat plate 21 to move upwards, so that the front seat tube section and the rear seat tube section of the seat tube 15 are relatively pivoted and approach each other, and the front frame 11 and the rear frame 12 are driven to rotate mutually Close, and the front foot frame 11 and the rear foot frame 12 move down due to gravity respectively, and the adjustment seat 44 subsequently rotates the foot frame 12 clockwise and moves down, resulting in the lower ends of the two straight rod sections 410 and the two hook parts 411 of the connecting rod 41 respectively Break away from the two adjustment seats 44, so that the backrest 22 loses the supporting positioning of the corresponding positioning hole 442 (see Figure 5) and can be turned down freely. Therefore, it can reduce the storage space occupied after folding.

Referring to Figure 9, when the user wants to unfold the foldable high chair from the folded state, he can directly pull the front leg frame 11 and the rear leg frame 12 away from each other with both hands first, so as to drive the seat tube 15 and the seat plate 21 is horizontally deployed between the front foot frame 11 and the rear foot frame 12. At this moment, the back rest 22 hangs below the seat plate 21 due to its own weight. Next, as shown in FIG. 10 , FIG. 11 and FIG. 12 , the backrest 22 is pulled counterclockwise to turn over in the direction above the seat plate 21 . During the overturning process, the lower ends of the two straight bar sections 410 of the connecting rod 41 of the support device 4 will abut against the two stop blocks 446 respectively, and press down the two stop blocks 446 and compress the two elastic elements 445 respectively, so that The two stop blocks 446 move down respectively along the two mounting holes 444, and the lower ends of the two straight rod sections 410 of the connecting rod 41 are introduced into the two adjustment grooves 443 along the guide slopes 448 of the two stop blocks 446 respectively, and the two straight rods of the connecting rod 41 The segments 410 are respectively affected by the elastic restoring force of the two elastic elements 445 to push the two hooks 411 of the connecting rod 41 into the corresponding concave holes 447 or the lower ends of the two straight rod segments 410 of the connecting rod 41 enter the corresponding positioning holes 442 to complete Back against 22 positioning.

Referring to Fig. 2 and Fig. 4, it should be noted that although in this embodiment, the back support device 4 includes a connecting rod 41, two return springs 42, two cover plates 43, and two adjustment seats 44 are assembled and matched. However, it is not limited thereto, the return spring 42, the cover plate 43 and the adjustment seat 44 of the support device 4 can only be arranged on one side of the two straight rod sections 410 of the connecting rod 41, that is to say, only the connecting rod 41 and the unilateral engagement and adjustment positioning of the adjustment seat 44 can also achieve the effect of the present invention.

Referring to FIG. 13 , it is the second preferred embodiment of the foldable high chair of the present invention, which is roughly the same as the first preferred embodiment, the main difference lies in the style of each stop block 446 . A limit hole 449 is formed above the recessed hole 447 of each stop block 446. The foldable high chair is in an unfolded state. The position holes 449 can be respectively engaged with the two hooks 411 of the connecting rod 41. In addition to restricting the excessive backward movement of the backrest 22 by the stop block 446, the two straight rod sections 410 of the connecting rod 41 can also be restricted from moving upwards, allowing users to The person knows that the backrest 22 can no longer be moved, and releases the external force applied to the connecting rod 41 to form the function of preventing detachment.

Referring to FIG. 14 , FIG. 15 and FIG. 16 , it is the third preferred embodiment of the foldable high chair of the present invention, which is roughly the same as the first preferred embodiment, the main difference lies in the style of the back support device 4 . Each adjustment seat 44 of this embodiment omits the stop block 446 (see FIG. 12 ) of each adjustment seat 44 of the first preferred embodiment, and the connecting rod 41 is operated by a different operating member 45 .

The operating member 45 has a housing 451 joined to the backrest 22, and a pair of elongated slot holes 221 are formed on the backrest 22 so that the housing 451 partially passes through the slot holes 221 and can be displaced along the slot holes 221. A guide groove 452 is defined on the side wall of 451 for receiving the horizontal bar section 412 of connecting rod 41, and this guide groove 452 has an upper edge 453 and a lower edge 454 in the height direction, when the operation member 45 is moved The connecting rod 41 is linked, and the lower ends of the two straight sections 410 of the connecting rod 41 are separated from the two adjustment seats 44 by the displacement of the connecting rod 41 in the height direction. On the rear wall of the backrest 22, a first return spring 46 is arranged relative to the connecting rod 41 to provide an elastic return force to the connecting rod 41. In addition, a second return spring 46 is arranged between the rear wall of the backrest 22 and the housing 451 of the operating member 45. The spring 47 provides elastic restoring force to the operating member 45 . In this embodiment, both the first return spring 46 and the second return spring 47 are compression springs.

In the third preferred embodiment, the unfolding and folding of the high chair is roughly the same as that of the first preferred embodiment, only the adjustment of the angle of the seat plate 21 and the backrest 22 and the operation of the folding and unfolding of the high chair are slightly different. There are different.

Referring to Fig. 16, when the high chair is unfolded, if the angle between the seat plate 21 and the backrest 22 is to be adjusted, at this time, by pushing the operating part 45 upwards, it is formed along the elongated slot 221 (see Fig. 15 ). The predetermined displacement causes the two hooks 411 of the connecting rod 41 to leave the corresponding positioning holes 442 and move up to the corresponding adjustment grooves 443, and then an appropriate positioning hole 442 can be selected so that the two hooks 411 of the connecting rod 41 correspond to the selected ones. The positioning hole 442 engages the positioning. In actual manufacturing, the two hook portions 411 of the connecting rod 41 can also be omitted, that is, the lower ends of the two straight rod sections 410 of the connecting rod 41 can be directly engaged with the corresponding positioning holes 442 for positioning.

Referring to Fig. 17, when the high chair is unfolded from the folded state, first use both hands to directly pull the front frame 11 and the rear frame 12 away from each other, and drive the seat tube 15 and the seat plate 21 to unfold horizontally on the front frame 11 and the rear Between the frames 12, the backrest 22 is pulled by hand to turn over toward the direction above the seat plate 21, that is, to turn counterclockwise. In more detail, during the overturning process, the lower ends of the two straight bar sections 410 of the connecting rod 41 of the supporting device 4 will abut against the outer surface of the second end 441 of the adjustment seat 44 respectively, and the connecting rod 41 of the supporting device 4 The two straight rod sections 410 are respectively pushed up to move up, and the horizontal rod section 412 of the connecting rod 41 slides to the upper edge 453 of the guide groove 452 and compresses the second return spring 47 . Now continue to turn over the backrest 22, so that the lower ends of the two straight bar sections 410 of the connecting rod 41 are respectively introduced into the two adjustment grooves 443 along the outer surfaces of the second ends 441 of the two adjustment seats 44, and the connecting rod 41 is supported by the second return spring 47 The horizontal bar section 412 of the connecting rod 41 is reset to the lower edge 454 of the guide groove 452 under the action of the elastic restoring force of the connecting rod 41, and the lower ends of the two straight bar sections 410 of the connecting rod 41 are pushed into the corresponding positioning holes 442, so that the two hook parts 411 Engaged with the corresponding positioning hole 442, that is the unfolded state as shown in FIG. 16 .

It should be added that the second embodiment shown in FIG. 13 and the third embodiment shown in FIG. 17 are similar to the back support device 4 of the first embodiment shown in FIG. The unilateral joint and adjustment positioning of the adjustment seat 44 can also achieve the effect of the present invention.

To sum up, the foldable high chair of the present invention provides a structural style different from that of the past. The connecting rod 41 and the adjustment seat 44 are detachably engaged so that when folded, the backrest 22 and the The seat boards 21 are close to each other with their backs, which reduces the occupied volume after being folded and reduces the storage space, so the purpose of the present invention can indeed be achieved.

The above descriptions are only preferred embodiments of the present invention, and cannot limit the scope of the present invention with this. That is, all simple equivalent changes and modifications made according to the claims of the present invention and the content of the description of the invention still belong to the present invention. covered by the patent.

Claims (13)

1. A collapsible high chair, comprising a supporting foot frame and a seat assembly connected to the supporting foot frame, the supporting foot frame includes a front foot frame whose upper ends are pivotally connected to each other and can be folded relatively close to each other With a rear foot frame, the seat assembly includes a seat plate pivotally connected between the front foot frame and the rear foot frame and a backrest pivotally connected with the seat plate, characterized in that; The foldable high chair also includes a backrest support device, the backrest support device includes a connecting rod and an adjustment seat, the adjustment seat is arranged on the supporting foot frame, and the connecting rod is arranged on the backrest The rear side and the lower end are detachably engaged with the adjustment seat, The adjustment seat has a first end adjacent to the front frame and a second end far away from the front frame, a plurality of positioning holes are defined between the first end and the second end; When the high chair is unfolded, the lower end of the connecting rod is inserted into one of the plurality of positioning holes to provide a specific angle of inclination of the backrest; The two sides of the seat plate are connected to the seat tube which is respectively pivotally connected between the front frame and the rear frame. The seat tube is composed of a front tube section and a rear tube section which are pivotally connected to each other. On the frame and the rear foot frame, the front tube section is fixedly connected with the seat plate, and the rear tube section is only pivotally connected with the other end of the front tube section. When the high chair is folded, the front tube section and the rear tube section of the seat tube are relatively pivoted. Turn to approach each other, drive the front foot frame and the rear foot frame to rotate and approach each other, when the lower end of the connecting rod is separated from the adjustment seat, the backrest can pivot relative to the seat plate. 2 . The foldable high chair according to claim 1 , wherein an adjustment slot communicating with the plurality of positioning holes is defined between the first end and the second end. 3. The foldable high chair as claimed in claim 2, wherein the adjustment groove is disposed on the upper edge of the plurality of positioning holes and communicates with the plurality of positioning holes. 4. The foldable high chair according to claim 3, wherein the adjustment seat is arranged on the rear foot frame, and the back support device further includes a return spring, and the return spring is arranged on the connecting rod and the seat assembly. 5 . The foldable high chair as claimed in claim 2 , wherein a stop block is provided at the second end of the adjustment seat, and the top surface of the stop block is higher than the bottom edge of the adjustment slot. 6 . 6. The foldable high chair according to claim 5, wherein the second end of the adjustment seat has a mounting hole, and the stopper is accommodated in the mounting hole and is elastically biased to make it The top surface of the stop block is higher than the bottom edge of the adjustment slot. 7. The foldable high chair as claimed in claim 5, wherein a guiding slope is formed on the top surface of the stop block. 8. The foldable high chair according to claim 5, wherein the lower end of the connecting rod protrudes to form a hook portion, and the inner side of the stop block is recessed to form a hook portion for the connecting rod Engaged pockets. 9. The foldable high chair according to claim 8, wherein a limiting hole is formed above the concave hole of the stop block. 10. The foldable high chair according to claim 1, characterized in that: the connecting rod is an inverted U-shaped rod, and the back support device further includes an operating part, and the operating part is linked The connecting rod is separated from the adjusting seat by a displacement in the height direction. 11. The foldable high chair according to claim 10, characterized in that: the operating member has a housing, the horizontal section of the connecting rod runs through the housing, and a side wall of the housing defines a The guide groove for receiving the horizontal bar section of the connecting rod has an upper edge and a lower edge in the height direction. 12. The foldable high chair according to claim 10, wherein when the lower end of the connecting rod abuts against the surface of the adjusting seat, the horizontal section of the connecting rod is elastically biased to slide on the Between the upper edge and the lower edge of the guide groove. 13. The foldable high chair according to claim 12, characterized in that: the backrest support device further comprises a first return spring arranged on the back wall of the backrest and a first return spring arranged on the rear wall of the backrest The second return spring between the wall and the housing of the operation member, the first return spring and the second return spring respectively provide elastic return force to the connecting rod and the operation member.