A movable backrest conversion mechanism with massage function

Abstract

The present invention provides a movable backrest conversion mechanism with a massage function, comprising a backrest bracket and a backrest, wherein the backrest is placed on the backrest bracket, and the backrest is extended along the length extension direction of the backrest bracket to form a support surface, and the backrest has a support state, a contraction state and a motion state, and the backrest also has an offset motion path, when the backrest is in the support state, the backrest and the support surface are in the same plane, when the backrest is in the motion state, the backrest is offset from the support surface and away from the side of the backrest contacting the back of the human body, and the support state and the motion state of the backrest are switched with each other through the offset motion path. By switching the position of the backrest in different states, the backrest will not contact the back of the human body during the motion process, the backrest will not be subject to resistance from the back of the human body when in motion, and the back of the human body will not feel uncomfortable due to the motion of the backrest, and the state is switched by the switching mechanism, the structure is simple, and the practicality and service life of the product are improved.

Description

Technical Field

[0001] The invention relates to a movable backrest providing support for a massage chair or a massage bed, and in particular to a movable backrest conversion mechanism with massage function. Background Art

[0002] At present, the existing movable massage backrests for massage chairs or massage beds have very good effects, but still have shortcomings;

[0003] Patent publication number "CN 109259999 A" discloses a function conversion mechanism of a movable massage backrest, which is applied to a massage chair or a massage bed, so that the massage chair or the massage bed can support the back of the human body when the massage function is not in use. According to actual use and user feedback, it is found that the product still has shortcomings. When the backrest switches between the contracted state and the extended state, the backrest has increased resistance during movement due to the backrest of the human body, which makes the product easy to damage and affects the service life of the product. In addition, when the backrest of the human body leans on the backrest, the backrest can also feel a noticeable scratching feeling, which makes the back of the human body uncomfortable. Therefore, improvements are still needed;

[0004] In view of the above defects, this case provides a movable backrest conversion mechanism with massage function to solve the above problems. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a backrest switching mechanism for a movable massage backrest which will not be subject to resistance from the back of a human body when switching states and will not cause discomfort to the back of the user.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a movable backrest conversion mechanism with massage function, including a backrest bracket and a backrest, the backrest is placed on the backrest bracket, the backrest is extended along the length extension direction of the backrest bracket to form a support surface, the backrest has a supporting state, a contracted state and a moving state, the backrest also has an offset active path, when the backrest is in the supporting state, the backrest and the supporting surface are in the same plane, when the backrest is in the moving state, the backrest is offset from the supporting surface and away from the side of the backrest contacting the human back, and the supporting state and the moving state of the backrest are switched with each other through the offset active path.

[0007] A switching mechanism is also included, and the switching mechanism forms an offset active path of the backrest through movement.

[0008] It also includes a massage component that moves up and down relative to the backrest bracket, the massage component has a first lock and a first lock head, the backrest has a second lock head that cooperates with the first lock, and the switching mechanism has a second lock buckle that cooperates with the first lock head. The first lock buckle and the first lock head move synchronously. When the first lock buckle of the massage component cooperates and locks with the second lock head of the backrest, the massage component drives the backrest to rise until the first lock head of the massage component cooperates and locks with the second lock buckle of the switching mechanism, and the backrest component is switched from the moving state to the supporting state along the offset active path through the switching mechanism.

[0009] The switching mechanism includes a support member arranged along the length extension direction of the backrest bracket, and also includes a pushing member that cooperates with the support member to push the backrest to move along the offset active path to switch to the supporting state. The support member is supported on the side of the backrest away from the human back.

[0010] The backrest bracket has a guide groove for the support member to perform linear displacement movement, the support member has a guide column, and the push member has a push groove for pushing the guide column to perform linear reciprocating movement relative to the guide column. The guide column of the support member passes through the guide groove of the backrest bracket and cooperates with the push groove of the push member.

[0011] The massage component is provided with a driving motor for controlling the synchronous movement of the first lock and the first lock head. The driving motor is connected to a rotating disk. The first lock head is assembled with the rotating disk through a linkage rod. When the driving motor rotates, the rotating disk drives the first lock head to retract and cooperate with or separate from the second lock of the switching mechanism.

[0012] An eccentric shaft is fixedly provided at the bottom of the rotating disk, and the first lock includes a fixed lock plate and a movable lock plate. Both the fixed lock plate and the movable lock plate are provided with lock holes for inserting the second lock head on the backrest, and the movable lock plate has an axial hole for inserting and rotating the eccentric shaft. The driving motor drives the eccentric shaft to rotate, and the eccentric shaft drives the movable lock plate to move left and right relative to the fixed lock plate to lock or unlock with the second lock head.

[0013] A moving slide plate is provided at the lock hole of the first lock buckle. When the second lock head is inserted into the lock hole, the second lock head buckles the moving slide plate to make a linear reciprocating motion in the lock hole.

[0014] The second lock buckle includes a lock shell, in which a flip lock core cooperating with the first lock head is provided. The lock shell is also provided with an elastic buckle for limiting the flip lock core from flipping when cooperating with the first lock head. It also includes a release plate. When the elastic buckle is in contact and pressed with the release plate, the elastic buckle and the flip lock core perform a release movement, and the flip lock core flips and separates from the first lock head to be unlocked.

[0015] The flip lock core is rotatably assembled in the lock shell through a pin shaft, and a torsion spring is provided between the flip lock core and the lock shell. The elastic buckle is rotatably matched with the lock shell through a pin shaft, and a reset spring is provided between the lock shell and the elastic buckle.

[0016] The elastic clip has a locking tooth, and correspondingly, the flip lock core is provided with a locking groove. The locking tooth of the elastic clip is elastically clamped in the locking groove of the flip lock core by a return spring. When the elastic clip is in contact and pressed with the release plate, the locking tooth of the elastic clip disengages from the locking groove of the flip lock core, and the flip lock core is flipped and separated from the first lock core and unlocked by the elastic action of the torsion spring and the external force of the first lock core.

[0017] The flip lock core has a first protrusion and a second protrusion, and a lock groove for the first lock head to be embedded is formed between the first protrusion and the second protrusion. The inner wall of the end of the first protrusion is provided with an arc surface that is convenient for contact and cooperation with the first lock head. When the first lock head rises to contact the first protrusion of the flip lock core, the upper surface of the first lock head contacts the arc surface of the first protrusion and drives the flip lock core to rotate until the flip lock core is clamped and locked with the elastic buckle. After the first lock head is locked with the flip lock core, it drives the entire switching mechanism to move up and down.

[0018] Beneficial effects of the present invention: The present invention provides a movable backrest conversion mechanism with a massage function, which can prevent the backrest from contacting the human back during movement by switching the position of the backrest in different states, and the backrest will not be resisted by the human back during movement, and the human back will not feel uncomfortable due to the movement of the backrest. The state is switched by a switching mechanism, the structure is simple, and the practicability and service life of the product are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the backrest of the present invention in a supporting state;

[0020] Figure 2 It is a structural schematic diagram of the backrest of the present invention in a retracted state;

[0021] Figure 3 It is a schematic structural diagram of the first lock buckle and the first lock head in the unlocked state of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the first lock buckle and the second lock head in a locked state of the present invention;

[0023] Figure 5 It is a schematic diagram of the exploded structure of the first lock buckle and the second lock head of the present invention;

[0024] Figure 6 The driving mechanism structure of the present invention is shown in FIG. Figure 1 ;

[0025] Figure 7The driving structure of the present invention is schematically shown in FIG. Figure 2 ;

[0026] Figure 8 for Figure 1 A magnified view of part A;

[0027] Fig. 9 It is a schematic diagram of the structure of the rotating disk of the present invention;

[0028] Fig.10 It is a cross-sectional view of the second lock buckle in a locked state of the present invention;

[0029] Fig.11 It is a schematic diagram of the structure of the second lock release state of the present invention;

[0030] Fig.12 It is a cross-sectional view of the second lock release state of the present invention. DETAILED DESCRIPTION

[0031] like Figures 1 to 12 As shown, in order to solve the problem that the backrest 200 of the massage chair will not contact the back of the human body and be subject to resistance during the activity, and will not make the back of the human body feel uncomfortable, a movable backrest conversion mechanism with a massage function is provided, including a backrest bracket 100 and a backrest 200, the backrest 200 is placed on the backrest bracket 100, and the backrest 200 is extended along the length extension direction of the backrest bracket 100 to form a support surface. The backrest 200 has a supporting state, a contracted state and a moving state. The backrest 200 also has an offset moving path. When the backrest 200 is in the supporting state, the backrest 200 and the supporting surface are in the same plane. When the backrest 200 is in the moving state, the backrest 200 is offset from the supporting surface and away from the side of the backrest 200 that contacts the back of the human body. The supporting state and the moving state of the backrest 200 are switched with each other through the offset moving path, and the supporting surface does not refer to The backrest 200 is not a surface of the backrest 200, but a reference surface. The height surface of the backrest 200 that supports the back of the human body when the backrest 200 moves along the backrest bracket 100 and unfolds to the supporting state is the supporting surface; the supporting state of the backrest 200 refers to the state in which the backrest 200 is fully extended to support the back of the human body; the contracted state refers to the state in which the backrest 200 is fully stored to leave space for the massage component 400 to move; the movement state of the backrest 200 refers to the movement state of the backrest 200 when switching between the contracted state and the supporting state, and the offset movement path refers to the position offset that occurs when the backrest 200 moves from the active state to the supporting state. The backrest 200 achieves its surface and the supporting surface in the same plane through its position offset, thereby supporting the back of the human body, or the surface of the backrest 200 is lower than the supporting surface so that it does not touch the back of the human body during movement.

[0032] In order to ensure that the backrest 200 can be switched from the active state to the supporting state, a switching mechanism 300 is also included. The switching mechanism 300 forms an offset active path of the backrest 200 through movement. The switching mechanism 300 uses a mechanical mechanism to move the backrest 200, thereby realizing mutual switching between the active state and the supporting state of the backrest 200.

[0033] In order to make the backrest 200 reciprocate along the backrest bracket 100, a massage component 400 is also included that moves up and down relative to the backrest bracket 100, the massage component 400 has a first lock 500 and a first lock head 600, the backrest 200 has a second lock head 700 that cooperates with the first lock 500, the switching mechanism 300 has a second lock 800 that cooperates with the first lock head 600, the first lock 500 moves synchronously with the first lock head 600, when the first lock 500 of the massage component 400 cooperates and locks with the second lock head 700 of the backrest 200, the massage component 400 drives the backrest 200 to rise until the first lock head 600 of the massage component 400 cooperates and locks with the second lock 800 of the switching mechanism 300, the backrest 200 component passes The massage component 400 is a prior art that switches from the moving state to the supporting state along the offset active path through the switching mechanism 300. The massage component 400 cooperates and links with the backrest 200 through the first lock 500, and cooperates and links with the switching mechanism 300 through the first lock head 600. The massage component 400 moves to contact with the backrest 200, thereby locking the second lock head 700 on the backrest 200 and driving the backrest 200 to move upward and stretch with the lock. When the massage component 400 moves to the point where its first lock head 600 cooperates and locks with the second lock head 800 of the switching mechanism 300, the massage mechanism drives the switching mechanism 300 to move until the switching mechanism 300 moves the backrest 200 along the offset active path to the supporting state, thereby achieving a supporting effect.

[0034] In order to enable the switching mechanism 300 to drive the backrest 200 to move along the offset active path, the switching mechanism 300 includes a support member 310 arranged along the length extension direction of the backrest bracket 100, and also includes a pushing member 320 that cooperates with the support member 310 to push the backrest 200 to move along the offset active path to switch to a supporting state. The support member 310 is supported on the side of the backrest 200 away from the back of the human body. The support member 310 is used to hold the backrest 200 to form a load-bearing support. The pushing member 320 moves synchronously with the massage component 400 to drive the support member 310 to move along the offset active path.

[0035] In order to ensure that the support member 310 can move along the offset active path, the backrest bracket 100 has a guide groove 110 for the support member 310 to perform linear displacement movement, the support member 310 has a guide column 311, and the pushing member 320 has a pushing groove 321 for pushing the guide column 311 to perform linear reciprocating movement relative to the guide column 311. The guide column 311 of the support member 310 passes through the guide groove 110 of the backrest bracket 100 and cooperates with the pushing groove 321 of the pushing member 320. The pushing groove 321 is an inclined groove, and the extension direction of the guide groove 110 is the path direction of the offset active path. When the pushing member 320 moves, the support member 310 is driven to move along the guide groove 110 through the pushing groove 321, thereby lifting the backrest 200 to move to the support surface to provide support for the human back.

[0036] In order to realize the linkage cooperation of the massage component 400 with the switching mechanism 300, the massage component 400 is provided with a driving motor 900 for controlling the synchronous movement of the first lock buckle 500 and the first lock head 600. The driving motor 900 is connected to a rotating disk 910. The first lock head 600 is assembled with the rotating disk 910 through a linkage rod 920. When the driving motor 900 rotates, the rotating disk 910 drives the first lock head 600 to extend and retract to cooperate with or separate from the second lock buckle 800 of the switching mechanism 300. The driving motor 900 is connected to the two linkage rods 920 through the rotating disk 910. The first lock heads 600 at the ends of the two linkage rods 920 respectively cooperate with the second lock buckles 800 of the switching mechanism 300 at both ends, thereby realizing the linkage cooperation of the massage component 400 with the switching mechanism 300.

[0037] In order to achieve synchronous movement of the first lock head 600 and the first lock buckle 500, respectively, the second lock buckle 800 and the second lock head 700 are locked and matched, an eccentric shaft 930 is fixedly provided at the bottom of the rotating disk 910, and the first lock buckle 500 includes a fixed lock plate 510 and a movable lock plate 520, and the fixed lock plate 510 and the movable lock plate 520 are both provided with a lock hole for the second lock head 700 on the backrest 200 to be inserted, and the movable lock plate 520 has an axial hole 521 for the eccentric shaft 930 to be inserted and rotated, and the driving motor 900 drives the eccentric shaft 930 to rotate, and the eccentric shaft 930 drives the movable lock plate 520 to move left and right relative to the fixed lock plate 510, so as to lock or unlock with the second lock head 700, and by arranging the eccentric shaft 930 at the bottom of the rotating disk 910, the eccentric shaft 930 rotates and cooperates with the axial hole 521 of the movable lock plate 520 to drive the movable lock plate 520 to move left and right, so as to achieve the second lock head 700 being locked in the first lock buckle 500.

[0038] In order to ensure that the first lock head 600 can make a linear motion in the lock hole, a moving slide 530 is provided at the lock hole of the first lock buckle 500. When the second lock head 700 is inserted into the lock hole, the second lock head 700 holds the moving slide 530 and makes a linear reciprocating motion in the lock hole. Because when the support member 310 lifts the backrest 200, the position of the first lock head 600 will also be displaced. Therefore, it is necessary to set a moving slide 530 at the lock hole. By making the moving slide 530 make a linear reciprocating motion relative to the lock hole, the stability of the first lock head 600 when moving in the lock hole is improved.

[0039] In order to realize self-locking and disengagement of the first lock head 600 with the second lock buckle 800, the second lock buckle 800 includes a lock shell 810, in which a flip lock core 820 cooperating with the first lock head 600 is provided, and an elastic buckle 830 is also provided in the lock shell 810 for limiting the flip lock core 820 from flipping when cooperating with the first lock head 600, and also includes a tripping plate 840. When the elastic buckle 830 contacts and presses the tripping plate 840, the elastic buckle 830 and the flip lock core 820 perform a tripping movement, and the flip lock core 820 flips and separates from the first lock head 600 and unlocks. When the massage component 400 moves upward until the first lock head 600 contacts the second lock buckle 800, the flip lock core 820 cooperates with the first lock head 600 to flip and lock, and then is clamped by the elastic buckle 830, so that the massage component 400 drives the switching mechanism 300 to move synchronously.

[0040] The flip lock cylinder 820 is assembled in the lock shell 810 through rotation of the pin shaft, and a torsion spring 850 is provided between the flip lock cylinder 820 and the lock shell 810, and the elastic buckle 830 is rotationally matched with the lock shell 810 through the pin shaft, and a reset spring 860 is provided between the lock shell 810 and the elastic buckle 830. The flip lock cylinder 820 is provided with a torsion spring 850, and an elastic restoring force is formed by the torsion spring 850. In a normal state, the lock groove 824 of the flip lock cylinder 820 is downward. When the first lock head 600 rises to contact the first protrusion 822 of the flip lock cylinder 820, it is flipped through the arc surface of its surface so as to be fastened with the elastic lock buckle, thereby realizing the lock cooperation between the first lock head 600 and the second lock buckle 800.

[0041] The elastic buckle 830 has a latching tooth 831, and correspondingly, the flip lock core 820 is provided with a latching groove 821. The latching tooth 831 of the elastic buckle 830 is elastically clamped in the latching groove 821 of the flip lock core 820 by the return spring 860. When the elastic buckle 830 is pressed against the release plate 840, the latching tooth 831 of the elastic buckle 830 is released from the latching groove 821 of the flip lock core 820. The flip lock core 820 is flipped and locked with the first lock core 600 by the elastic action of the torsion spring 850 and the external force of the first lock core 600. 600 is separated and unlocked, and the elastic buckle 830 is locked with the flip lock core 820 by the elastic force of the reset spring 860. When the massage component 400 moves downward until the elastic buckle 830 is in contact and pressed with the trip plate 840, the locking tooth 831 of the elastic buckle 830 is separated from the locking groove 821 of the flip lock core 820. At this time, the flip lock core 820 is reset according to the elastic restoring force of the torsion spring 850 and the pressure generated when the first lock head 600 moves downward, thereby separating from the first lock head 600, thereby achieving tripping and unlocking.

[0042] The flip lock cylinder 820 described has a first protrusion 822 and a second protrusion 823, and a lock groove 824 is formed between the first protrusion 822 and the second protrusion 823 for the first lock head 600 to be embedded. The inner wall of the end of the first protrusion 822 is provided with an arc surface that is convenient for contacting and cooperating with the first lock head 600. When the first lock head 600 rises to contact the first protrusion 822 of the flip lock cylinder 820, the upper surface of the first lock head 600 contacts the arc surface of the first protrusion 822 and drives the flip lock cylinder 820 to rotate until the flip lock cylinder 820 is clamped and locked with the elastic buckle 830. After the first lock head 600 is locked with the flip lock cylinder 820, it drives the entire switching mechanism 300 to move up and down. The arc surface on the first protrusion 822 is for cooperating with the first lock head 600 to realize flipping. When the first lock head 600 contacts the arc surface of the first protrusion 822, the flip lock cylinder 820 is flipped along the arc surface. If the arc surface is not provided, the flip lock cylinder 820 cannot be flipped normally or the flipping is not smooth.

[0043] The working process of the movable backrest 200 is that when the backrest 200 switches from the contracted state to the supported state, the driving motor 900 on the massage component 400 drives the rotating disk 910 to rotate, and the eccentric shaft 930 at the bottom of the rotating disk 910 drives the movable lock plate 520 to lock the second lock head 700 on the backrest 200 with the first lock buckle 500, and the massage component 400 moves upward, pulling the backrest 200 to extend until the first lock head 600 of the massage component 400 contacts the second lock buckle 800 of the driving mechanism, and the first lock head 600 contacts the first protrusion 822 of the flip lock cylinder 820, and the flip lock cylinder 82 0 After the first protrusion 822 moves along the arc surface to realize flipping until the lock groove 824 of the flip lock core 820 is completely locked with the first lock head 600, the locking teeth 831 of the elastic buckle 830 cooperate with the locking groove 821 of the flip lock core 820 to realize locking, the massage component 400 drives the switching mechanism 300 to move upward, and the pusher 320 of the switching mechanism 300 drives the support member 310 to make a linear motion relative to the guide groove 110 of the backrest bracket 100, so that the support member 310 lifts the backrest 200 until it reaches the supporting state, in which the backrest 200 is used to support the back of the human body;

[0044] When the backrest 200 switches from the supporting state to the retracted state, the massage component 400 drives the driving mechanism to move downward, and the pushing member 320 of the driving mechanism drives the supporting member 310 to make a linear motion along the guide groove 110, and the supporting member 310 holds the backrest 200 and keeps it away from the back of the human body. During the movement, the backrest 200 will not touch the back of the human body until the elastic buckle 830 on the driving mechanism contacts and presses the release plate 840 to release, and the flip lock core 820 is separated from the first lock head 600, and the massage component 400 continues to move downward and drives the backrest 200 to decline and retract. When the backrest 200 is fully retracted, the driving motor 900 controls the rotating disk 910 to rotate, and the eccentric shaft 930 at the bottom of the rotating disk 910 drives the movable lock plate 520 to unlock. At this time, the second lock head 700 of the backrest 200 is unlocked and separated from the first lock buckle 500 of the massage component 400. In this state, the backrest 200 is in a retracted state to leave space for the massage component 400 to massage.

[0045] Beneficial effects of the present invention: The present invention provides a movable backrest conversion mechanism with a massage function, which can prevent the backrest from contacting the human back during movement by switching the position of the backrest in different states, and the backrest will not be resisted by the human back during movement, and the human back will not feel uncomfortable due to the movement of the backrest. The state is switched by a switching mechanism, the structure is simple, and the practicability and service life of the product are improved.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, simple changes and substitutions by ordinary technicians in the field are within the protection scope of the present invention.

Claims

1. A movable backrest conversion mechanism with massage function, comprising a backrest bracket and a backrest, wherein the backrest is placed on the backrest bracket, characterized in that: The backrest is extended along the length extension direction of the backrest bracket to form a supporting surface. The backrest has a supporting state, a contracted state and a moving state. The backrest also has an offset movable path. When the backrest is in the supporting state, the backrest and the supporting surface are in the same plane. When the backrest is in the moving state, the backrest is offset from the supporting surface and away from the side of the backrest that contacts the back of the human body. The supporting state and the moving state of the backrest are switched with each other through the offset movable path; it also includes a switching mechanism, which forms the offset movable path of the backrest through movement; it also includes a massage component that moves up and down relative to the backrest bracket, the massage component has a first lock and a first lock head, the backrest has a second lock head that cooperates with the first lock head, the switching mechanism has a second lock buckle that cooperates with the first lock head, the first lock buckle moves synchronously with the first lock head, and when the first lock buckle of the massage component cooperates and locks with the second lock head of the backrest, the massage component drives the backrest to rise to the position where the first lock of the massage component and the second lock head of the switching mechanism are locked. When the lock is locked, the backrest assembly switches from the moving state to the supporting state along the offset active path through the switching mechanism; the switching mechanism includes a support member arranged along the length extension direction of the backrest bracket, and also includes a pushing member that cooperates with the support member to push the backrest to move along the offset active path to switch to the supporting state, and the support member is supported on the side of the backrest away from the back of the human body; the backrest bracket has a guide groove for the support member to perform linear displacement movement, the support member has a guide column, and the pushing member has a pushing groove for pushing the guide column to perform linear reciprocating movement relative to the guide column, and the guide column of the support member passes through the guide groove of the backrest bracket and cooperates with the pushing groove of the pushing member; the massage assembly is provided with a driving motor for controlling the synchronous movement of the first lock and the first lock head, the driving motor is connected to a rotating disk, and the first lock head is assembled with the rotating disk through a linkage rod. When the driving motor rotates, the rotating disk drives the first lock head to retract and cooperate with or separate from the second lock of the switching mechanism.

2. A movable backrest conversion mechanism with massage function as claimed in claim 1, characterized in that: An eccentric shaft is fixedly provided at the bottom of the rotating disk, and the first lock includes a fixed lock plate and a movable lock plate. Both the fixed lock plate and the movable lock plate are provided with lock holes for inserting the second lock head on the backrest, and the movable lock plate has an axial hole for inserting and rotating the eccentric shaft. The driving motor drives the eccentric shaft to rotate, and the eccentric shaft drives the movable lock plate to move left and right relative to the fixed lock plate to lock or unlock with the second lock head.

3. A movable backrest conversion mechanism with massage function as claimed in claim 2, characterized in that: A moving slide plate is provided at the lock hole of the first lock buckle. When the second lock head is inserted into the lock hole, the second lock head buckles the moving slide plate to make a linear reciprocating motion in the lock hole.

4. The movable backrest conversion mechanism with massage function as claimed in claim 1, characterized in that: The second lock buckle includes a lock shell, in which a flip lock core cooperating with the first lock head is provided. The lock shell is also provided with an elastic buckle for limiting the flip lock core from flipping when cooperating with the first lock head. It also includes a release plate. When the elastic buckle is in contact and pressed with the release plate, the elastic buckle and the flip lock core perform a release movement, and the flip lock core flips and separates from the first lock head to be unlocked.

5. The movable backrest conversion mechanism with massage function as claimed in claim 4, characterized in that: The flip lock core is rotatably assembled in the lock shell through a pin shaft, and a torsion spring is provided between the flip lock core and the lock shell. The elastic buckle is rotatably matched with the lock shell through a pin shaft, and a reset spring is provided between the lock shell and the elastic buckle.

6. The movable backrest conversion mechanism with massage function as claimed in claim 5, characterized in that: The elastic clip has a locking tooth, and correspondingly, the flip lock core is provided with a locking groove. The locking tooth of the elastic clip is elastically clamped in the locking groove of the flip lock core by a return spring. When the elastic clip is in contact and pressed with the release plate, the locking tooth of the elastic clip disengages from the locking groove of the flip lock core, and the flip lock core is flipped and separated from the first lock core and unlocked by the elastic action of the torsion spring and the external force of the first lock core.

7. The movable backrest conversion mechanism with massage function as claimed in claim 6, characterized in that: The flip lock core has a first protrusion and a second protrusion, and a lock groove for the first lock head to be embedded is formed between the first protrusion and the second protrusion. The inner wall of the end of the first protrusion is provided with an arc surface that is convenient for contact and cooperation with the first lock head. When the first lock head rises to contact the first protrusion of the flip lock core, the upper surface of the first lock head contacts the arc surface of the first protrusion and drives the flip lock core to rotate until the flip lock core is clamped and locked with the elastic buckle. After the first lock head is locked with the flip lock core, it drives the entire switching mechanism to move up and down.

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