Seat mechanism and carrier

Abstract

The seat mechanism comprises a seat, a backrest and armrests, the seat, the backrest and the armrests are rotationally connected through rotating joints, the seat mechanism further comprises a first locking mechanism arranged between the armrests and the seat, the first locking mechanism is arranged outside the rotating joints, an unlocking part is arranged on the backrest, and the first locking mechanism is arranged outside the rotating joints. When the folding backrest of the seat mechanism rotates to be close to the seat, the unlocking part can be matched with the first locking mechanism so as to drive the first locking mechanism to be unlocked. In the seat mechanism, the first locking mechanism is arranged outside the rotating joint, and the width size of the rotating joint in the left-right direction can be reduced, so that the width size of the seat mechanism in the left-right direction is reduced, or the sitting space of a child is increased. Besides, when the seat mechanism is folded and the backrest rotates to be close to the seat, the first locking mechanism can be unlocked, so that the first locking mechanism does not need to be unlocked by independent operation, and the folding operation of the seat mechanism is very convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to children's products technical field, concretely relates to a seat mechanism and carrier. BACKGROUND

[0002] The seat mechanism generally includes a seat, a backrest and an armrest, and the seat, the backrest and the armrest are rotatably connected through a rotary joint. In the prior art, the rotary joint has a large width in the left-right direction, so that the seat mechanism has a large width size in the left-right direction. In addition, the seat mechanism in the prior art also has the problem of inconvenient folding. SUMMARY

[0003] The utility model discloses to aim at the deficiency in the prior art, provide a seat mechanism that structure size is small and folding is convenient.

[0004] To achieve the above object, the utility model adopts the technical scheme that:

[0005] A seat mechanism has an unfolded state and a folded state, comprising a seat, a backrest and an armrest, the seat, the backrest and the armrest are rotatably connected through a rotary joint, the seat mechanism further comprises a first locking mechanism arranged between the armrest and the seat to lock the relative position of the two, the first locking mechanism is arranged outside the rotary joint, an unlocking portion is arranged on the backrest, when the backrest of the seat mechanism is folded and rotated relative to the seat and is close to the seat, the unlocking portion can cooperate with the first locking mechanism to drive the first locking mechanism to unlock.

[0006] In some embodiments, the first locking mechanism includes a locking piece movably arranged on one of the seat and the armrest and a locking slot arranged on the other and adapted to the locking piece; when the first locking mechanism is in the locked state, the locking piece is inserted in the locking slot; when the first locking mechanism is in the unlocked state, the locking piece is out of the locking slot; the unlocking portion cooperates with the locking piece.

[0007] In some embodiments, the rotary joint includes a first joint seat fixedly arranged on the backrest, and the unlocking portion is arranged outside the first joint seat.

[0008] A first protrusion is arranged on the first joint seat and protrudes outward from the outer contour surface thereof, the unlocking portion is a first inclined surface arranged on the first protrusion, and a second inclined surface adapted to the first inclined surface is arranged on the locking piece; when the seat mechanism is folded and the backrest is rotated in the direction of close to the seat, the first inclined surface can cooperate with the second inclined surface; when the seat mechanism is in the folded state, the first inclined surface is away from the second inclined surface.

[0009] In some embodiments, a third inclined surface is further arranged on the first protrusion, and a fourth inclined surface is further arranged on the locking member; when the seat mechanism is unfolded and the backrest is rotated away from the seat, the third inclined surface can be in abutting engagement with the fourth inclined surface; when the seat mechanism is in the unfolded state, the third inclined surface is away from the fourth inclined surface.

[0010] In some embodiments, the fourth inclined surface and the second inclined surface are symmetrically arranged on opposite sides of the locking member.

[0011] In some embodiments, a connecting section is further arranged on the first protrusion, and the connecting section is arranged between the first inclined surface and the third inclined surface.

[0012] When the first inclined surface is disengaged from the second inclined surface, or the third inclined surface is disengaged from the fourth inclined surface, the connecting section can be in abutting engagement with the locking member.

[0013] In some embodiments, the seat mechanism further comprises a resilient member, one end of the resilient member is arranged on a component of the seat and the armrest on which the locking member is arranged, and the other end of the resilient member is arranged on the locking member.

[0014] In some embodiments, the rotary joint further comprises a second joint seat fixedly arranged on the rear portion of the seat, the second joint seat extends upward from the rear portion of the seat, and the locking member is slidably arranged on the rear portion of the seat.

[0015] The rotary joint further comprises a third joint seat fixedly arranged on the armrest, the third joint seat is provided with a second protrusion protruding outward from the outer contour surface thereof, and the locking slot is arranged on the second protrusion.

[0016] In some embodiments, the seat mechanism further comprises a second locking mechanism arranged between the backrest and the seat to lock the relative positions of the backrest and the seat, and the second locking mechanism is arranged in the rotary joint.

[0017] In some embodiments, the rotary joint comprises a first joint seat fixedly arranged on the backrest, a second joint seat fixedly arranged on the rear portion of the seat, and a third joint seat fixedly arranged on the armrest, the first joint seat and the third joint seat are respectively rotationally connected with the second joint seat, and the axis of rotation of the first joint seat and the second joint seat and the axis of rotation of the third joint seat and the second joint seat extend along the same straight line.

[0018] This utility model also provides a seating mechanism having an unfolded state and a folded state, including a seat, a backrest, and armrests. The seat, the backrest, and the armrests are rotatably connected by a rotating joint. The seating mechanism also includes a first locking mechanism disposed between the armrests and the seat to lock their relative positions. The first locking mechanism is disposed outside the rotating joint. When the seating mechanism is in the folded state, the first locking mechanism is in the locked state. The backrest is provided with an unlocking part. When the seating mechanism unfolds the backrest and rotates away from the seat, the unlocking part can cooperate with the first locking mechanism to drive the first locking mechanism to unlock.

[0019] The present invention also provides a carrier, the carrier including a base frame and a seating mechanism as described in any of the preceding claims disposed on the base frame.

[0020] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: In the seat mechanism of this utility model, the first locking mechanism is set outside the rotating joint, which reduces the width of the rotating joint in the left-right direction, thereby correspondingly reducing the width of the seat mechanism in the left-right direction. Alternatively, when the width of the seat mechanism in the left-right direction is constant, reducing the width of the rotating joint in the left-right direction increases the size of the seating space for children, thus increasing the comfort of children. In addition, when the seat mechanism is folded, when the backrest rotates to approach the seat, the unlocking part acts on the first locking mechanism, thereby unlocking the first locking mechanism. This eliminates the need for separate operation to unlock the first locking mechanism; after the first locking mechanism is unlocked, the armrests can rotate downwards under their own weight to approach the seat, making the folding operation of the seat mechanism very convenient and easy to use. Attached Figure Description

[0021] Appendix Figure 1 This is a three-dimensional schematic diagram of the seat mechanism in the unfolded state of Embodiment 1.

[0022] Appendix Figure 2 This is a side view of the seat mechanism in the unfolded state in Embodiment 1.

[0023] Appendix Figure 3 This is one of the cross-sectional schematic diagrams of the seating mechanism in the unfolded state of Embodiment 1;

[0024] Appendix Figure 4 This is a second cross-sectional view of the seating mechanism in the unfolded state of Embodiment 1.

[0025] Appendix Figure 5 For the appendix Figure 4 Enlarged view of a portion of point A in the middle;

[0026] Fig. 2 is a side view of the seat mechanism of the present embodiment 1 in the folding process (the backrest is turned forward to unlock the first locking mechanism) ; Figure 6 Fig. 3 is a sectional view of the seat mechanism of the present embodiment 1 in the folding process (the backrest is turned forward to unlock the first locking mechanism) ;

[0027] Fig. 4 is a side view of the seat mechanism of the present embodiment 1 in the folded state; Figure 7 Fig. 5 is a sectional view of the seat mechanism of the present embodiment 1 in the folded state;

[0028] Fig. 6 is a perspective view of the backrest of the present embodiment 1; Figure 8 Fig. 7 is a partial enlarged view of Fig. 6 at A; Figure 7 Fig. 8 is a perspective view of the seat and footrest of the present embodiment 1;

[0029] Fig. 9 is a perspective view of the armrest of the present embodiment 1; Figure 9 Fig. 10 is a side view of the seat mechanism of the present embodiment 1 in the folded state;

[0030] Fig. 11 is a sectional view of the seat mechanism of the present embodiment 1 in the folded state; Figure 10 Fig. 12 is a perspective view of the backrest of the present embodiment 1;

[0031] Fig. 13 is a partial enlarged view of Fig. 12 at A; Figure 11 Fig. 14 is a perspective view of the seat and footrest of the present embodiment 1; Figure 10 Fig. 15 is a partial enlarged view of Fig. 14 at A;

[0032] Fig. 16 is a perspective view of the armrest of the present embodiment 1; Figure 12 Fig. 17 is a partial enlarged view of Fig. 16 at A;

[0033] Fig. 18 is a perspective view of the locking member and elastic member of the present embodiment 1 (enlarged view). Figure 13 Fig. 19 is a sectional view of the locking member and elastic member of the present embodiment 1 (enlarged view).

[0034] Fig. 20 is a perspective view of the locking member and elastic member of the present embodiment 1 (enlarged view). Figure 14 Fig. 21 is a partial enlarged view of Fig. 20 at A. Figure 13 Fig. 22 is a sectional view of the locking member and elastic member of the present embodiment 1 (enlarged view).

[0035] Fig. 23 is a perspective view of the locking member and elastic member of the present embodiment 1 (enlarged view). Figure 15 Fig. 24 is a sectional view of the locking member and elastic member of the present embodiment 1 (enlarged view).

[0036] Wherein: 1, seat; 11, second joint seat; 2, backrest; 21, first joint seat; 211, first convex part; 211a, first inclined surface; 211b, third inclined surface; 211c, connecting section; 3, armrest; 31, third joint seat; 311, second convex part; 311a, locking groove; 4, locking member; 41, locking part; 42, second inclined surface; 43, fourth inclined surface; 5, elastic member; 6, footrest. DETAILED DESCRIPTION

[0037] The technical scheme of the present utility model will be further described below in combination with the drawings and specific embodiments.

[0038] In the following description, the directions of "front", "rear", "left", "right", "upper", "lower" and the like are all according to the directions shown in the drawings. Figure 2In the figure, the left direction is "front", the right direction is "back", the top direction is "up", and the bottom direction is "down". The directions perpendicular to the paper are "left" and "right". The above definitions of directions are only for the convenience of describing the present invention and 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, and therefore should not be construed as limiting the present invention.

[0039] Example 1

[0040] like Figures 1-9 As shown, the seating mechanism of this utility model includes a seat 1, a backrest 2, and an armrest 3, which are connected by a rotating joint.

[0041] The rotary joint includes a first joint seat 21, a second joint seat 11, and a third joint seat 31. For example... Figures 8-14 As shown, the first joint seat 21 is fixedly installed at the end of the backrest 2, the second joint seat 11 is fixedly installed at the rear of the seat 1, and the third joint seat 31 is fixedly installed at the end of the armrest 3. The first joint seat 21 and the third joint seat 31 are rotatably connected to the second joint seat 11, and the axis of rotation connecting the first joint seat 21 and the second joint seat 11, and the axis of rotation connecting the third joint seat 31 and the second joint seat 11, extend in the same straight line direction.

[0042] The seating mechanism has an unfolded state and a folded state. When the seating mechanism is in the unfolded state, both the backrest 2 and the armrests 3 rotate backward and away from the seat 1, as shown. Figures 1-4 As shown. When the seat mechanism is in the folded state, both the backrest 2 and the armrest 3 rotate forward and move closer to the seat 1, as shown. Figure 9 As shown. By rotating the first joint seat 21 and the third joint seat 31 relative to the second joint seat 11, the seat mechanism can be switched between an unfolded state and a folded state.

[0043] The seating mechanism also includes a first locking mechanism and a second locking mechanism. The first locking mechanism is disposed between the seat 1 and the armrest 3 to lock their relative positions, and the second locking mechanism is disposed between the seat 1 and the backrest 2 to lock their relative positions. When the seating mechanism is in the unfolded state, both the first and second locking mechanisms are locked. When the first and second locking mechanisms are unlocked, the backrest 2 can rotate relative to the seat 1 and move closer to it, and the armrest 3 can rotate relative to the seat 1 and move closer to it under its own weight, thereby folding the seating mechanism from the unfolded state. In this embodiment, when the seating mechanism is in the folded state, the first locking mechanism is unlocked.

[0044] The second locking mechanism is located inside the rotating joint, while the first locking mechanism is located outside the rotating joint. This allows the width of the rotating joint in the left-right direction to be reduced, thereby correspondingly reducing the width of the seat mechanism in the left-right direction. Alternatively, when the width of the seat mechanism in the left-right direction is constant, reducing the width of the rotating joint in the left-right direction increases the size of the seating space for children within the seat mechanism, thus increasing the comfort of children.

[0045] The first locking mechanism includes a locking element 4 movably disposed on one of the seat 1 and the armrest 3, and a locking groove 311a disposed on the other and adapted to the locking element 4. When the first locking mechanism is in the locked state, the locking element 4 is partially inserted into the locking groove 311a, thereby locking the relative position between the seat 1 and the armrest 3, preventing the armrest 3 from rotating relative to the seat 1. Figure 4 and Figure 5 As shown. When the first locking mechanism is in the unlocked state, the locking element 4 is completely disengaged from the lock groove 311a, and the armrest 3 can rotate relative to the seat 1, as shown. Figure 7 and Figure 8 As shown.

[0046] Specifically, such as Figure 15 As shown, a locking part 41 is provided at one end of the locking member 4. When the first locking mechanism is in the locked state, the locking part 41 is inserted into the lock groove 311a, as shown. Figure 4 and Figure 5 As shown. When the first locking mechanism is in the unlocked state, the locking part 41 disengages from the lock groove 311a, as... Figure 7 and Figure 8 As shown.

[0047] In this embodiment, the second joint seat 11 extends upward from the rear of the seat 1, and the locking member 4 is slidably disposed at the rear of the seat 1. The third joint seat 31 has a second protrusion 311 protruding outward from its outer contour surface, and a locking groove 311a is disposed on the second protrusion 311. This arrangement positions the first locking mechanism outside the rotating joint, such as... Figures 3-5 , Figure 7 and Figure 8 As shown.

[0048] The seat mechanism further comprises a resilient member 5, one end of the resilient member 5 is arranged on the part of the seat 1 and the armrest 3 where the locking member 4 is arranged, in this embodiment, the one end of the resilient member 5 is arranged on the seat 1, and the other end of the resilient member 5 is arranged on the locking member 4. The elastic force of the resilient member 5 is used to drive the locking member 4 to automatically slide in the direction of inserting the locking part 41 into the locking groove 311a. In this embodiment, the first locking mechanism is unlocked when the locking member 4 slides leftward or rightward and inward of the seat 1 in the locked state, and the elastic force of the resilient member 5 drives the locking member 4 to slide leftward or rightward and outward of the seat 1 to lock the first locking mechanism.

[0049] The second locking mechanism can adopt the structure in the prior art, for example, the second locking mechanism comprises a locking tooth which is slidably arranged between the first joint seat 21 and the second joint seat 11, and the first joint seat 21 and the second joint seat 11 are both provided with a tooth groove which is engaged with the locking tooth. When the second locking mechanism is in the locked state, the locking tooth is engaged with the tooth grooves on the first joint seat 21 and the second joint seat 11 respectively. When the second locking mechanism is in the unlocked state, the locking tooth is engaged with the tooth groove on the first joint seat 21 and disengaged with the tooth groove on the second joint seat 11, or the locking tooth is engaged with the tooth groove on the second joint seat 11 and disengaged with the tooth groove on the first joint seat 21.

[0050] The seat mechanism further comprises an unlocking mechanism, which can unlock the second locking mechanism when the unlocking mechanism is operated in the locked state of the second locking mechanism. The unlocking mechanism can adopt the structure in the prior art, for example, the unlocking mechanism comprises an unlocking operating member, an unlocking driving member and a traction cable. The unlocking operating member is slidably arranged on the backrest 2. The unlocking driving member is rotatably or slidably arranged in the first joint seat 21, and the unlocking driving member is matched with the locking tooth. One end of the traction cable is arranged on the unlocking operating member, and the other end of the traction cable is arranged on the unlocking driving member. When the unlocking operating member is operated, the unlocking driving member is pulled by the traction cable to rotate or slide in the first joint seat 21, and the unlocking driving member acts on the locking tooth, thereby driving the locking tooth to slide and unlocking the second locking mechanism.

[0051] In the folding process of the seat mechanism, when the backrest 2 rotates towards the seat 1 after the second locking mechanism is unlocked, the first locking mechanism can be unlocked. In this way, the first locking mechanism does not need to be separately operated in the folding process of the seat mechanism, and the unlocking of the first locking mechanism can be achieved through the rotation of the backrest 2, so that the unlocking operation of the first locking mechanism is convenient, and the folding operation of the seat mechanism is convenient.

[0052] Specifically, as Figure 10 and Figure 11As shown, the backrest 2 is provided with an unlocking part, when the seat mechanism is folded from the unfolded state, the backrest 2 is rotated to close to the seat 1, the unlocking part can cooperate with the locking part 4, so that the unlocking part acts on the locking part 4, and the locking part 4 slides to the left or right and to the inner side of the seat 1, so as to be separated from the locking groove 311a, that is, the first locking mechanism is unlocked.

[0053] In this embodiment, the first joint seat 21 is provided with a first protruding part 211 protruding outward from the outer contour surface thereof, and the unlocking part is a first inclined surface 211a provided on the first protruding part 211. The locking part 4 is provided with a second inclined surface 42 matched with the first inclined surface 211a, as shown in Figure 10 、 Figure 11 and Figure 15 .

[0054] When the seat mechanism is in the unfolded state, the first protruding part 211 is located at the lower part of the first joint seat 21 and in front of the locking part 4, and the first inclined surface 211a is in abutting engagement with the second inclined surface 42. When the backrest 2 is rotated to close to the seat 1, the locking part 4 slides to the left or right and to the inner side of the seat 1 by the action of the first inclined surface 211a and the second inclined surface 42, so as to unlock the first locking mechanism. When the seat mechanism is in the unfolded state, the first inclined surface 211a and the second inclined surface 42 can also be in a disengaged state, but when the backrest 2 is rotated to a certain angle in the direction of closing to the seat 1, the first inclined surface 211a and the second inclined surface 42 can also be in abutting engagement.

[0055] When the seat mechanism is in the folded state, the first inclined surface 211a is away from the second inclined surface 42.

[0056] When the seat mechanism is in the folded state, the locking part 4 slides to the left or right and to the outer side of the seat 1 by the elastic force of the elastic part 5, and the first protruding part 211 is located behind the locking part 4, so as to block the first protruding part 211 by the locking part 4, so that the backrest 2 is not easy to rotate away from the seat 1 without external force, so as to keep the seat mechanism in the folded state.

[0057] The first protruding part 211 is further provided with a third inclined surface 211b, and the locking part 4 is further provided with a fourth inclined surface 43 matched with the third inclined surface 211b, as shown in Figure 10 、 Figure 11 and Figure 15When the seat mechanism is in the folded state, the third inclined surface 211b abuts against the fourth inclined surface 43, so that when the seat mechanism is unfolded, the third inclined surface 211b acts on the fourth inclined surface 43, and the locking member 4 slides leftward or rightward and toward the inner side of the seat 1 gradually away from the first protrusion 211, so that the backrest 2 can rotate away from the seat 1 to unfold the seat mechanism. When the seat mechanism is in the unfolded state, the third inclined surface 211b is away from the fourth inclined surface 43.

[0058] The first protrusion 211 further has a connecting section 211c arranged between the first inclined surface 211a and the third inclined surface 211b. When the seat mechanism is folded and the backrest 2 rotates relative to the seat 1 to make the first inclined surface 211a disengage from the second inclined surface 42, the connecting section 211c abuts against the locking member 4, so that when the first locking mechanism is unlocked but the armrest 3 has not started to rotate, the locking member 4 can be prevented from sliding leftward or rightward and toward the outer side of the seat 1 under the elastic force of the elastic member 5, i.e. the first locking mechanism can be prevented from being locked again. When the seat mechanism is unfolded and the backrest 2 rotates relative to the seat 1 to make the third inclined surface 211c disengage from the fourth inclined surface 43, the connecting section 211c also abuts against the locking member 4.

[0059] In this embodiment, the fourth inclined surface 43 and the second inclined surface 42 are symmetrically arranged on opposite sides of the locking member 4, which makes the structure of the locking member 4 simple and facilitates the manufacture.

[0060] As shown in Figs. 1, 2 and 3, the seat mechanism can further include a footrest 6, one end of which is rotatably connected to the front of the seat 1. When the seat mechanism is in the unfolded state, the footrest 6 extends forward and downward from the connection with the seat 1. When the seat mechanism is folded, the footrest 6 can be rotated upward to be located in front of the seat 1. Figures 1-3 , Figure 6 , Figure 9 and Figure 12 As shown in Figs. 1, 2 and 3, the seat mechanism can further include a footrest 6, one end of which is rotatably connected to the front of the seat 1. When the seat mechanism is in the unfolded state, the footrest 6 extends forward and downward from the connection with the seat 1. When the seat mechanism is folded, the footrest 6 can be rotated upward to be located in front of the seat 1.

[0061] This embodiment further provides a carrier, such as a stroller, a trailer, a dining chair, etc. Specifically, the carrier includes a chassis, and the seat mechanism is arranged on the chassis. For example, when the carrier is a stroller, the chassis is the stroller frame. The seat mechanism can be connected to the chassis in a fixed manner, a rotatable manner, a detachable manner, etc.

[0062] Embodiment 2

[0063] In this embodiment, when the seat mechanism is in the folded state, the first locking mechanism is in the locked state. The backrest 2 is also provided with an unlocking portion, which can cooperate with the locking piece 4 when the seat mechanism is unfolded from the folded state and the backrest 2 is rotated away from the seat 1, so that the unlocking portion acts on the locking piece 4, and the locking piece 4 slides to the left or right and to the inner side of the seat 1, thereby unlocking the first locking mechanism.

[0064] The cooperation between the unlocking portion and the locking piece 4 can adopt the cooperation between the third inclined surface 211c and the fourth inclined surface 43 in Embodiment 1, or other ways.

[0065] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A seating mechanism characterized by: The seat mechanism has an unfolded state and a folded state, and comprises a seat, a backrest and an armrest, the seat, the backrest and the armrest are connected through a rotating joint, the seat mechanism further comprises a first locking mechanism arranged between the armrest and the seat to lock the relative position of the armrest and the seat, the first locking mechanism is arranged outside the rotating joint, an unlocking part is arranged on the backrest, when the seat mechanism folds the backrest relative to the seat and the backrest is close to the seat, the unlocking part can cooperate with the first locking mechanism to drive the first locking mechanism to be unlocked.

2. The seating mechanism of claim 1, wherein: The first locking mechanism comprises a locking piece movably arranged on one of the seat and the armrest and a locking slot arranged on the other and matched with the locking piece; when the first locking mechanism is in a locked state, the locking piece is inserted in the locking slot; When the first locking mechanism is in an unlocked state, the locking piece is separated from the locking slot; the unlocking part cooperates with the locking piece.

3. The seating mechanism of claim 2, wherein: The rotating joint comprises a first joint seat fixedly arranged on the backrest, and the unlocking part is arranged outside the first joint seat; The first joint seat is provided with a first protrusion protruding outward from the outer profile thereof, the unlocking part is a first inclined surface arranged on the first protrusion, and the locking piece is provided with a second inclined surface matched with the first inclined surface; when the seat mechanism is folded and the backrest is rotated towards the seat, the first inclined surface can cooperate with the second inclined surface; when the seat mechanism is in the folded state, the first inclined surface is away from the second inclined surface.

4. The seating mechanism of claim 3, wherein: The first protrusion is further provided with a third inclined surface, and the locking piece is further provided with a fourth inclined surface matched with the third inclined surface; when the seat mechanism is unfolded and the backrest is rotated away from the seat, the third inclined surface can cooperate with the fourth inclined surface; when the seat mechanism is in the unfolded state, the third inclined surface is away from the fourth inclined surface.

5. The seating mechanism of claim 4, wherein: The fourth inclined surface and the second inclined surface are symmetrically arranged on opposite sides of the locking piece; And / or, the first protrusion is further provided with a connecting section arranged between the first inclined surface and the third inclined surface; When the first inclined surface is separated from the second inclined surface or the third inclined surface is separated from the fourth inclined surface, the connecting section can abut against the locking piece.

6. The seating mechanism of claim 2, wherein: The seat mechanism further comprises a resilient piece, one end of the resilient piece is arranged on a part of the seat and the armrest where the locking piece is arranged, and the other end of the resilient piece is arranged on the locking piece.

7. The seating mechanism according to any one of claims 2-6, characterized in that: The rotating joint further comprises a second joint seat fixedly arranged on the rear part of the seat, the second joint seat extends upward from the rear part of the seat, and the locking piece is slidably arranged on the rear part of the seat; The rotating joint further comprises a third joint seat fixedly arranged on the armrest, and the third joint seat is provided with a second protrusion protruding outward from the outer profile thereof, and the locking slot is arranged on the second protrusion.

8. The seating mechanism of claim 1, wherein: The seat mechanism further comprises a second locking mechanism arranged between the backrest and the seat to lock the relative position of the two, the second locking mechanism being arranged in the rotary joint; And / or, the rotary joint comprises a first joint seat fixedly arranged on the backrest, a second joint seat fixedly arranged on the rear part of the seat, and a third joint seat fixedly arranged on the armrest, the first joint seat and the third joint seat being respectively rotatably connected with the second joint seat, the axis of rotation of the first joint seat and the second joint seat and the axis of rotation of the third joint seat and the second joint seat extending along the same straight line.

9. A seating mechanism characterized by: Has an unfolded state and a folded state, including a seat, a backrest and an armrest, the seat, the backrest and the armrest are rotatably connected by a rotary joint, the seat mechanism further comprises a first locking mechanism arranged between the armrest and the seat to lock the relative position of the two, the first locking mechanism is arranged outside the rotary joint, when the seat mechanism is in the folded state, the first locking mechanism is in the locked state, the backrest is provided with an unlocking part, when the seat mechanism unfolds the backrest and rotates away from the seat, the unlocking part can cooperate with the first locking mechanism to drive the first locking mechanism to unlock.

10. A vehicle characterized by: Comprise a chassis and a seat mechanism arranged on the chassis, the seat mechanism is as claimed in any one of claims 1-9.

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