CN102727002A - Folding baby seat with adjustable backrest - Google Patents

Abstract

The invention discloses a folding baby chair capable of adjusting the inclination of a chair back, which comprises a chair seat, the chair back, a crus backrest, armrests arranged on two sides of the chair seat and a locking mechanism for adjusting the inclination of the chair back, wherein one end of the chair seat is pivoted at the lower end of the chair back and forms a first pivoting point, the other end of the chair seat is pivoted at the crus backrest and forms a third pivoting point, one end of each armrest is pivoted on the chair back and forms a second pivoting point, the second pivoting point is positioned above the first pivoting point, the other end of each armrest is pivoted at the upper end of the crus backrest and forms a fourth pivoting point, and the fourth pivoting point is positioned above the third pivoting point, so that the baby chair forms a four-bar linkage mechanism, and the chair back can drive the crus backrest to rotate and; the locking mechanism is arranged between any two of the seat, the chair back, the crus rest and the armrests to lock the seat, the chair back, the crus rest and the armrests, and the locking mechanism can release the locking between the seat, the chair back, the crus rest and the armrests. The baby chair is not only simple and practical, but also has good stability when leaning backwards, and can be optimally folded when being folded.

Description

Folding baby seat with adjustable backrest

technical field

The invention relates to a baby article, more particularly to a foldable baby seat with adjustable seat back inclination.

Background technique

At present, in the research and development of some baby products, in order to minimize the occupancy rate of space, the design of folding and collapsing is adopted. For example, the baby stroller, when in use, is stretched and opened, and when placed, it is folded and collapsible. On some baby strollers, in order to achieve a further folding effect, the baby seat is also designed to be foldable and foldable, and can be dismantled for easy storage and transportation. For example, a front seat of a baby carriage disclosed on June 24, 2009, the patent number is ZL200820094975.5, the seat part in this patent includes a seat frame tube, a seat fixing tube connected with the seat frame tube, a seat segment seat , the armrest part and the footrest part, there are at least two installation positions on the seat fixing pipe, the seat segment seat is connected to the seat fixing pipe at any installation position and connected to the other end of the support part, the armrest part and the footrest part are folded The adjusting seat is connected with the seat frame pipe respectively. However, after the inclination adjustment of the backrest part is completed, the angle of the foot part needs to be adjusted additionally. This often requires an adjustment mechanism for the calf part, which virtually increases the cost input, and the independent foot part Design, when the seat is reclined, it will affect the stability of the seat, and when the seat is folded, it will not only affect the convenience of folding, but also affect the degree of folding and folding. In addition, the adjustment mechanism of the backrest part includes seat segment seat, seat fixing tube, seat frame tube pin and escape hole. The adjustment operation mainly uses the seat segment seat to slide on the seat fixing tube and seat frame tube to adjust the angle, and then Cooperating and fixing through the seat bolt and the escape hole, its structure is relatively complicated and consumable, which is not conducive to production and promotion.

Therefore, it is necessary to provide a foldable baby seat with simple structure, practicality and convenience, which can adjust the inclination of the seat back to solve the above-mentioned defects. , to meet the comfort of the baby when lying flat to sleep, and it is folded more compactly to reduce the space occupied.

Contents of the invention

The purpose of the present invention is to provide a foldable baby seat with adjustable chair back slope, which not only can be stretched and folded, is simple and saves materials, but also has good stability when the back of the chair is reclined, and satisfies the comfort of the baby when lying flat and sleeping. When folded, it can be optimally folded to reduce space occupation.

In order to achieve the above object, the present invention provides a foldable baby seat with adjustable seatback inclination, which includes a seat, a chair back, calf rests, armrests on both sides of the seat and a seat for adjusting the inclination of the seatback. One end of the seat is pivotally connected to the lower end of the chair back to form a first pivot point, the other end is pivotally connected to the lower leg rest to form a third pivot point, and one end of the armrest is pivotally connected to the chair back and form a second pivot point, and the second pivot point is located above the first pivot point, the other end of the armrest is pivotally connected to the upper end of the calf rest and forms a fourth pivot point pivot point, and the fourth pivot point is located above the third pivot point, so that the baby seat forms a four-bar linkage mechanism, and the seat back can drive the legrest to rotate and simultaneously stretch or When folded, the seat can move up in parallel with the movement of the back of the chair, and the seat pulls the lower legs to rotate close to the seat, so that the lower legs can be folded under the seat by folding; The locking mechanism is arranged between any two of the seat seat, the chair back, the calf rest and the armrest to lock the two, and the locking mechanism is operable to release the locking between the two. Since the main body of the baby seat is a four-link mechanism, when it is stretched, opened or folded, the seat back can simultaneously drive the calf to extend or retract, which is equivalent to eliminating the adjustment mechanism for adjusting the angle of the calf, and the foldable More compact when folded.

Preferably, the distance between the first pivot point and the second pivot point is equal to the distance between the third pivot point and the fourth pivot point, and the distance between the first pivot point and the third pivot point The distance is equal to the distance between the second pivot point and the fourth pivot point, so that the baby seat forms a parallelogram four-bar linkage mechanism, so that the seat back can drive the calf to stretch simultaneously Or folded, eliminating the need to add an adjustment mechanism to adjust the angle of rotation of the calf, and when the baby seat is reclined, because the armrests are relatively fixed, the chair is tilted backward, and the seat and the calf are tilted forward. The force and the forward force are balanced and offset each other, so that the center of gravity remains unchanged, thereby ensuring the stability of the seat.

Preferably, there are seat back retaining walls protruding from both sides of the surface of the chair back, and through holes are respectively opened on both sides of the seat seat, and the seat back retaining walls can pass through the through holes to enable folding and stowing. When the back of the chair and the seat are facing each other, by setting the back retaining wall, the activity space of the baby in the baby seat is increased, which not only increases the comfort of the baby when lying down and sleeps, but also forms a A protective space, and the opened through hole can correspond to the seat back wall to ensure that the baby seat is completely folded and folded, so that the height of the folded baby seat is equivalent to the height of the seat back, reducing the space requirement. occupy.

Preferably, the locking mechanism includes an operating part, a guide, a pulling wire and several locking pieces, and the guide is movably arranged in the seat, the back of the chair, the calf rest and the armrest Any one of them, the pulling wire is connected between the operation part and the guide piece, and the first end of the lock piece is telescopically connected to the seat, chair The second end of any one of the back, calf rest and armrest is connected to the guide, the lock has a locked position and an unlocked position on the guide, and Both the locked position and the unlocked position can be switched by movement of the guide.

Preferably, the guide is arranged at the bottom of the seat so that the formed locking mechanism does not affect the folding and folding of the baby seat.

Preferably, the first end of the locking member is telescopically connected to the armrest, and the second end is connected to the seat through the guide, so that the locking mechanism locks the seat between and operable to unlock the armrest.

Preferably, the locking mechanism includes two locking pieces, and each locking piece is arranged between one side of the guide piece and the corresponding side end of the armrest, so as to facilitate the connection between the seat and the armrest. Locking between armrests.

Preferably, two sides of the guide member are respectively provided with guide holes with inclined surfaces, the second ends of the two lock members are respectively connected to the corresponding guide holes, and the lock members The second end slides on the inclined surface of the guide hole to switch between the locking position and the unlocking position. Through the setting of the inclined surface, the second end of the locking member can be effectively placed between the locking position and the unlocking position Sliding conversion achieves the effect of the cam principle, cleverly controls the expansion and contraction of the locking piece to lock the seat back and can unlock it.

Preferably, the guide has an inclined portion that gradually shrinks from the back to the front, and the guide holes are opened on both sides of the inclined portion, so that the guide can move up and down smoothly without hindrance. Parts on both sides rub against each other.

Preferably, the inner side of the armrest is respectively provided with locking blocks, and the two locking blocks are provided with an equal number of radially distributed locking holes inwardly, and the locking holes on the two locking blocks are opposite to each other. setting, the locking piece locks the armrest through the connection with the locking hole, and the equal setting on both sides of the armrest not only ensures that the seat back can be accurately adjusted to the required angle, but also makes the seat back better locked .

Preferably, two sides of the bottom of the seat are oppositely provided with positioning portions for positioning the locking member, the positioning portion includes a first positioning portion and a second positioning portion, the first end of the locking member passes through The first positioning part is connected to the armrest, and the second end of the locking part is connected to the guide part through the second positioning part, so that the first end of the locking part can be vertically connected to the Lock on the block to ensure its locking effect.

Preferably, the locking part has a convex part, and the locking part is covered with an elastic part, and the elastic part is arranged between the convex part and the second positioning part, so that the locking part is telescopically connected on the armrest.

Preferably, several installation holes are opened on the guide piece, and the guide piece is fixed on any one of the seat seat, chair back, calf rest and armrest through the cooperation of the fixing piece and the installation hole. one.

Preferably, the installation hole is elongated, and the fixing member can move in the installation hole, so that the guide member is movably arranged, thereby driving the locking member to perform locking and unlocking operations.

Preferably, the operating part is movably arranged on the back of the seat back, so as to facilitate the user to operate the locking mechanism and avoid affecting the folding of the baby seat.

Compared with the prior art, the foldable baby seat with adjustable seatback inclination of the present invention has simple structure, smooth operation, compact folding and less space occupation, which is favorable for popularization and use in industrial production.

Description of drawings

Fig. 1 is a perspective view of the infant seat of the present invention.

Fig. 2 is a schematic diagram of the structure of the infant seat of the present invention.

Fig. 3 is a state view of the baby seat of the present invention when it is folded and closed.

Fig. 4 is a schematic diagram of the folding process of the baby seat of the present invention.

Fig. 5 is a state diagram when the baby seat of the present invention is reclined.

Fig. 6 is a schematic diagram of the baby seat unfolding and reclining process of the present invention.

Fig. 7 is a schematic diagram of the upright state and the reclined state of the infant seat of the present invention.

8 is a perspective view of another angle of the baby seat of the present invention, showing the locking mechanism of the baby seat of the present invention in detail.

Fig. 9 is a partially exploded perspective view of the locking mechanism of the baby seat of the present invention.

Fig. 10 is a schematic diagram of the movement of the locking mechanism of the baby seat of the present invention when the seat back is released.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and preferred embodiments, but the embodiments of the present invention are not limited thereto.

Please refer to Fig. 1 and Fig. 2, a foldable baby seat with an adjustable seat back gradient provided by the present invention includes a seat seat 3, a seat back 2, a calf rest 5, and armrests on both sides of the seat seat. 4 and the locking mechanism 6 for adjusting the inclination of the chair back, wherein the seat 3 is used to accommodate the baby's buttocks, the chair back 2 is used to lean against and support the baby's back, and the armrest 4 can not only be used as a baby's hand Stopping, also enclosing the activity space of the baby seat 1, one end of the seat 3 is pivotally connected to the lower end of the seat back 2 to form the first pivot point 7, and the other end is pivotally connected to the calf rest 5 to form the third pivot point 9 One end of the armrest 4 is pivotally connected to the chair back 2 to form a second pivot point 8, and the second pivot point 8 is located above the first pivot point 7, and the other end is pivotally connected to the upper end of the calf rest 5 to form a fourth pivot point contact point 10, and the fourth pivot point 10 is located above the third pivot point 9, so that the baby seat 1 forms a four-bar linkage mechanism, the seat back 2 can drive the calf rest 5 to rotate and simultaneously stretch or retract, and the seat 3 can move up in parallel with the movement of the seat back 2, and the seat 3 pulls the calf rest 5 to rotate close to the seat 3, so that the calf rest 5 is folded and folded under the seat 3; the locking mechanism 6 is arranged on the seat 3, the seat Between any two of the back 2 , calf rest 5 and armrest 4 , the two are locked, and the locking mechanism 6 is operable to release the locking between the two. Since the main body of the baby seat 1 is a four-bar linkage mechanism, when stretched, opened or folded, the seat back 2 can simultaneously drive the calf rest 5 to stretch or retract, which is equivalent to eliminating the adjustment mechanism for adjusting the angle of the calf rest , and make it more compact when folded and folded.

2 to 6, specifically, the distance between the first pivot point 7 and the second pivot point 8 is equal to the distance between the third pivot point 9 and the fourth pivot point 10, and the first pivot point The distance between 7 and the third pivot point 9 is equal to the distance between the second pivot point 8 and the fourth pivot point 10, so that the baby seat 1 is formed as a parallelogram four-bar linkage mechanism, so that the seat back 2 It can drive the calf rest 5 to rotate and simultaneously stretch or retract, eliminating the need to add an adjustment mechanism to adjust the rotation angle of the calf rest 5, simplifying the design and operation, and saving production costs, and when the baby seat 1 is reclined At this time, because the armrest 4 is relatively fixed, the chair back 2 is tilted backward, and the seat 3 and the calf rest 5 are tilted forward. stability, and when the baby seat 1 is folded forward, the seat back 2 is pushed close to the seat 3, and the lower leg rest 5 is also rotated and close to the seat 3. The whole operation is convenient to fold and can achieve better The collapse effect.

Please refer to Fig. 1, specifically, the two sides of the surface of the chair back 2 protrude from the back wall 21, and the two sides of the seat 3 are respectively provided with through holes 31, and the seat back wall 21 can pass through the through hole 31. In order to make the seat back 2 and the seat 3 face to face when folded and folded, by setting the seat back retaining wall 21, the activity space of the baby in the baby seat 1 is increased, which not only increases the comfort of the baby when lying down and sleeping degree, and also forms a protective space, and the opened through hole 31 can correspond to the seat back wall 21 provided to ensure that the baby seat 1 is completely folded and folded, so that the height of the folded baby seat 1 is equivalent to Due to the height of the chair back 2, the occupation of space is reduced.

Please refer to Fig. 8 and Fig. 9, the locking mechanism 6 includes an operating part 64, a guide 61, a pulling wire 63 and several locking members 62, and the guide 61 is movably arranged on the seat 3 and the back 2 Any one of the four, the calf rest 5 and the armrest 4, the pulling wire 63 is connected between the operation part 64 and the guide 61, and the first end 621 of the locking member 62 is telescopically connected to the guide 61 relative to the guide 61. The second end 622 of any one of the seat 3 , the chair back 2 , the calf rest 5 and the armrest 4 is connected to the guide 61 , and the locking member 62 has a locking position on the guide 61 and the unlocked position, and both the locked position and the unlocked position can be switched by the movement of the guide 61 . Wherein, the locking member 62 can be a bolt.

Specifically, the guide member 61 is disposed at the bottom of the seat 3 to avoid affecting the folding effect of the baby seat 1 . Specifically, the first end 621 of the locking member 62 is telescopically connected to the armrest 4, and the second end 622 is connected to the seat 3 through the guide 61, so that the locking mechanism 6 locks between the seat 3 and the armrest 4 and operable to unlock it. Specifically, the locking mechanism 6 includes two locking pieces 62, and each locking piece 62 is arranged between one side of the guide piece 61 and the side end of the corresponding armrest 4, so as to facilitate the connection between the seat 3 and the armrest 4. between locks. More specifically, guide holes 611 with inclined surfaces 6111 are respectively opened on both sides of the guide member 61, the second ends 622 of the two locking members 62 are respectively connected to the corresponding guide holes 611, and the second ends 622 of the locking members 62 The two ends 622 slide on the inclined surface 6111 of the guide hole 611 to switch both the locked position and the unlocked position; through the inclined surface 6111, the second end 622 of the locking member 62 can be effectively positioned at the locked position and the unlocked position Sliding conversion between them, to achieve the effect of the cam principle, cleverly control the expansion and contraction of the locking member 62 to lock the seat back 2 and can unlock it. Preferably, the guide 61 has an inclined portion 613 that gradually shrinks from the back to the front, and the guide holes 611 are opened on both sides of the inclined portion 613. By providing the inclined portion 613, when the guide 61 moves up and down, it can Smooth and unobstructed, avoiding contact friction with parts on both sides.

Specifically, the two locking blocks 68 are respectively fixedly connected to the inner side of the armrest 4, that is, between the armrest 4 and the seat 3, and the two locking blocks 68 are respectively inwardly provided with an equal number of radially distributed locking holes 681. , and the locking holes 681 on the two locking blocks 68 are arranged oppositely, the locking member 62 is connected with the locking holes 681 to lock the relative position of the armrest 4 and the seat 3, thereby fixing the inclination angle of the seat back 2 or the seat 1 In the state of use, the equivalence on both sides of the armrest 4 not only ensures that the seat back 2 can be accurately adjusted to a desired angle, but also enables better locking of the seat back 2 .

Specifically, the two sides of the bottom of the seat 3 are oppositely provided with a positioning portion 66 for positioning the locking member 62. The positioning portion 66 includes a first positioning portion 661 and a second positioning portion 662, and the first end 621 of the locking member 62 passes through. The first positioning part 661 is connected with the armrest 4 and the locking block 68, and the second end 622 of the locking part 62 passes through the second positioning part 662 and is connected with the guide part 61, so that the first end 621 of the locking part 62 can be vertically connected. In the locking block 68, its locking effect is guaranteed. More specifically, the locking member 62 has a convex portion 623, and the locking member 62 is sleeved with an elastic member 65, and the elastic member 65 is disposed between the convex portion 623 and the second positioning portion 662, so that the locking member 62 is telescopically connected to the armrest. 4, wherein the elastic member 65 is a compression spring.

Please continue to refer to Figure 9, the guide piece 61 is provided with several installation holes 612, and the guide piece 61 is fixed on the seat seat 3, the chair back 2, the calf rest 5 and the Any one of the four four handrails. More specifically, the mounting hole 612 is elongated, and the fixing member 67 can move in the mounting hole 612 so that the guiding member 61 is movably disposed, thereby driving the locking member 62 to perform locking and unlocking operations.

Specifically, the operating portion 64 is movably disposed on the back of the seat back 2 to facilitate the user to operate the locking mechanism 6 and avoid affecting the folding of the baby seat.

The locking and unlocking operations of the locking mechanism 6 of the baby seat 1 of the present invention will be further described below with reference to the drawings.

Please refer to Fig. 8, when the locking mechanism fixes the seat back 2, the first ends 621 of the two locking pieces 62 are plugged into the locking holes 681 on the locking block 68 through the corresponding first positioning portions 661, and the second The end 622 engages with the guide hole 611 on the guide member 61 through the corresponding second positioning portion 662, and the second end 622 is in the first position of the guide hole 611, and is sleeved on the two locking members 62. The spring 65, because it is arranged between the convex portion 623 and the second positioning portion 662 of the corresponding locking member 62, its elastic pressure impels it to push the convex portion 623 and the second positioning portion 662 to the respective two ends, thereby pushing the corresponding The first end 621 of the locking member 62 is firmly inserted into the locking hole 681 , and the second end 622 tightens the guiding member 61 . At this time, the fixing member 67 is at the rear end of the installation hole 612 .

Please refer to Fig. 10, when the locking mechanism 6 adjusts the inclination of the seat back 2, the operating part 64 is pulled upwards in the direction of the arrow, and the traction wire 63 connected between the operating part 64 and the guide 61 is operated. The applied force of part 64 moves upward along the pulling force, and it also acts on guide piece 61, so that guide piece 61 also moves backward, while fixing piece 67 moves relative to installation hole 612 and gradually approaches installation hole 612 Front end. At the same time, due to the movement of the guide piece 61 toward the rear seat back, the second ends 622 of the two locking pieces 62 gradually move toward the side of the guide hole 611 along the following surface 6111 on the corresponding guide hole 611. In the second position, the corresponding first end 621 is pulled out of the locking hole 681 , so that the locking mechanism 6 releases the locking between the seat 3 and the armrest 4 , and the inclination of the seat back 2 can be operatively adjusted. At this time, the two springs 65 are pressed by the inward movement of the corresponding convex portion 623 and the second positioning portion 662 . If the baby seat 1 is to be folded, as shown in FIG. 2 , as long as the seat back 2 and the seat 3 are folded, the calf rest will be folded together. After the inclination adjustment is completed, the operating part 64 is released, and the two springs 65 return elastically, pushing against the convex part 623 and the second positioning part 662 at both ends, so that the second ends 622 of the two locking parts 62 are pulled and guided member 61, and return to the first position of the guide hole 611 along the corresponding following surface 6111, while the fixing member 67 moves upward relative to the mounting hole 612 and gradually approaches the upper end of the mounting hole 612. At this time, the locking member 62 The first end 622 is plugged into the corresponding locking hole to lock the seat back 2 .

The folding, folding, opening and stretching of the baby seat 1 of the present invention will be further described below with reference to the drawings.

Please refer to FIG. 3 and FIG. 4 , when it is folded, if the armrest 4 is used as a fixed reference object, the seat back 2 rotates toward the fourth pivot point 10 with the second pivot point 8 as the pivot axis. And gradually leaning towards the armrest 4, the seat 3 moves with the chair back 2 due to the first pivot point 7 and folds upwards parallel to the armrest 4, and the seat 3 pulls the calf by the connection of the third pivot point 9 at the same time. It also moves along with the chair back 2, and the calf rest 5 takes the fourth pivot point 10 as a pivot axis and gradually turns to lean against the seat 3. Finally, the seat 3 and the chair back 2 lean against each other face to face, and the calf rest 5 It is also folded and folded under the seat 3, and the height of the folded baby seat 1 is equivalent to the height of the seat back 2.

Please refer to Fig. 5 and Fig. 6, when it is opened and stretched, if the armrest 4 is used as a fixed reference object, as the chair back 2 is unfolded with the second pivot point 8 as the pivot axis, the chair back 2 passes through the second pivot point 8. A pivot point 7 pushes the seat 3, so that the seat 3 moves forward in a direction parallel to the armrest 4, and the seat 3 pushes the calf rest 5 through the third pivot point 9, so that the calf rest 5 is connected to the fourth pivot point. 10 is a pivot shaft and is launched upwards simultaneously until the chair back 2 reclines to the desired position.

Please refer to shown in Fig. 7, since the baby seat 1 of the present invention is a parallelogram four-bar linkage mechanism, when the seat 1 is reclined, the armrest 4 is relatively fixed, the chair back 2 is reclined, the seat 3 moves forward and the calf rests 5. Forward leaning, the generated backward leaning force and forward leaning force balance and cancel each other, so that the center of gravity remains unchanged, thereby ensuring the stability of the seat 1 .

The present invention has been described above in conjunction with the best embodiments, but the present invention is not limited to the above-disclosed embodiments, but should cover various modifications and equivalent combinations made according to the essence of the present invention.

Claims (15)

1. A foldable baby seat with adjustable seat back inclination, comprising a seat, seat back, calf rest, armrests on both sides of the seat and a locking mechanism for adjusting the seat back inclination, its features In that: one end of the seat is pivotally connected to the lower end of the chair back to form a first pivot point, the other end is pivotally connected to the lower leg rest to form a third pivot point, and one end of the armrest is pivotally connected to the and form a second pivot point on the back of the chair, and the second pivot point is located above the first pivot point, and the other end of the armrest is pivotally connected to the upper end of the calf rest to form a fourth pivot point, And the fourth pivot point is located above the third pivot point, so that the baby seat forms a four-bar linkage mechanism, and the seat back can drive the calf to rotate and simultaneously stretch or retract, The seat can move up in parallel with the movement of the seat back, and the seat pulls the lower legs to rotate close to the seat, so that the lower legs can be folded under the seat by folding; the locking mechanism is set Between any two of the seat, the chair back, the calf rest and the armrest, the two are locked, and the locking mechanism is operable to release the locking between the two. 2. The baby seat according to claim 1, wherein the distance between the first pivot point and the second pivot point is equal to the distance between the third pivot point and the fourth pivot point, and The distance between the first pivot point and the third pivot point is equal to the distance between the second pivot point and the fourth pivot point, so that the baby seat forms a parallelogram four-bar linkage mechanism. 3. The baby seat as claimed in claim 1, characterized in that: the two sides of the surface of the back of the seat protrude from the back of the seat, and the two sides of the seat are respectively provided with through holes, when folded and folded, The seat back blocking wall passes through the through hole so that the seat back and the seat seat face to face against each other. 4. The baby seat according to claim 1, characterized in that: the locking mechanism includes an operating part, a guide, a pulling wire and several locking pieces, and the guide is movably arranged on the Any one of the seat, seat back, calf rest and armrest, the traction line is connected between the operation part and the guide, and the first end of the lock is opposite to the guide The guide piece is telescopically connected to the other one of any one of the seat, the chair back, the calf rest and the armrest, the second end is connected to the guide piece, and the locking piece is connected to the guide piece. The guide part has a locking position and an unlocking position, and the locking position and the unlocking position can be switched by moving the guide part. 5. The infant seat as claimed in claim 4, wherein the guide member is arranged at the bottom of the seat. 6. The baby seat according to claim 5, wherein the first end of the locking member is telescopically connected to the armrest, and the second end is connected to the seat through the guide member . 7. The baby seat as claimed in claim 6, wherein the locking mechanism comprises two locking pieces, each of the locking pieces is arranged on one side of the guide piece and corresponds to the corresponding between the side ends of the armrest. 8. The baby seat according to claim 7, wherein guide holes with inclined surfaces are opened on both sides of the guide piece, and the second ends of the two lock pieces are respectively connected to corresponding The guide hole, and the second end of the locking member slides on the inclined surface of the guide hole to switch between the locked position and the unlocked position. 9. The baby seat according to any one of claims 4 to 8, wherein the guide has an inclined portion that gradually decreases from the rear to the front, and the guide hole is opened in the inclined portion. sides. 10. The baby seat according to claim 4 or 6, characterized in that: the inner side of the armrests are respectively provided with locking blocks, and two of the locking blocks are respectively inwardly provided with an equal number of radially distributed locking holes, and the locking holes on the two locking blocks are oppositely arranged, and the locking piece locks the armrest by cooperating with the locking holes. 11. The baby seat according to claim 5 or 6, characterized in that: the two sides of the bottom of the seat are oppositely provided with positioning parts for positioning the locking member, and the positioning parts include a first positioning part and a second positioning part, the first end of the locking part passes through the first positioning part and is connected to the armrest, and the second end of the locking part passes through the second positioning part and the guide part connect. 12. The baby seat according to claim 11, wherein the locking part has a convex part, and the locking part is covered with an elastic part, and the elastic part is arranged on the convex part and the second positioning part between, so that the locking member is telescopically connected to the armrest. 13. The baby seat according to claim 4, characterized in that: several installation holes are opened on the guide piece, and the guide piece is fixed on the seat seat through the cooperation of the fixing piece and the installation hole. , chair back, calf rest and armrest any one of four. 14. The baby seat according to claim 13, wherein the installation hole is elongated, and the fixing member can move in the installation hole. 15. The baby seat as claimed in claim 4, wherein the operating part is movably arranged behind the seat back.

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