Mechanism with swing capacity changing along with state switching

Abstract

The invention provides a mechanism with the swing capacity changing along with state switching. The mechanism comprises a state switching assembly, a swing assembly, a limiting assembly and an actuator. The state switching assembly changes the shape switching state through an actuator, the swing assembly enables the state switching assembly to swing in response to external force, the swing assembly comprises two swing units, and each swing unit comprises at least two swing parts. The number of the limiting assemblies is at least two, each limiting assembly comprises a limiting piece and a limiting groove, the swing space of each limiting groove becomes smaller when getting close to the locking end, and the limiting pieces and the limiting grooves are arranged on the swing pieces or the state switching assemblies. Under the driving of an actuator, the mechanism has a first state, a second state and a middle state, when the middle state is switched to the first state and the second state, different limiting assemblies play roles, the swing amplitude is correspondingly reduced until locking is achieved during state switching, the first state and the second state are high in functionality and need to be stable, and the middle state can swing to improve the sitting feeling; the following-swinging limiting assembly has the advantages of avoiding interference and jamming and the like.

Description

Technical Field

[0001] The invention relates to the field of furniture, and in particular to a mechanism whose swinging ability changes with state switching. Background Art

[0002] Seats appear in various scenarios of life and work and are frequently used by people. In order to cope with various scenarios and to meet the needs of different groups of people, seats have gradually extended to more and more types. The main difference lies in the functions of the seats. Among seats, mechanical sofas are developing better and better. In order to gain the favor of the elderly, manufacturers want to add rocking and assisted rising functions to mechanical sofas considering the preferences and needs of the elderly. The mechanical sofa with the rocking function feels close to a rocking chair, which is not only more in line with the preferences of the elderly, but also its comfort and experience will also be loved by young people. For the elderly and other people with limited mobility, getting up from the seat is a relatively difficult task, and the assisted rising function can facilitate people with mobility problems to get up from the mechanical sofa.

[0003] However, if this kind of special mechanical sofa is to be developed, two functions need to achieve a synergistic effect. Specifically, when assisting standing, the mechanical sofa needs to be kept stable so that the user can stand up safely. Therefore, the rocking function is required to be temporarily disabled in the assisted standing state. Furthermore, from the overall function of the mechanical sofa, it generally has a sitting state, a TV state and a lying state. The rocking function needs to be coordinated with each state. For example, the rocking function should be normally implemented in the sitting state and the TV state, and the rocking function should also be temporarily disabled in the lying state. Summary of the invention

[0004] In order to solve the above-mentioned technical problems, the present invention provides a mechanism whose swinging ability changes with state switching, including a state switching component, a swinging component, a limit component and an actuator; the state switching component changes its shape to switch state by the actuator, and the swinging component enables it to swing in response to external force, the swinging component includes two swinging units, and the swinging unit includes at least two swinging parts; there are at least two limit components, both of which include a limit part and a limit groove, and the swinging space of the limit groove becomes smaller when it approaches the locking end, and the limit part and the limit groove are arranged on the swinging part or the state switching component; under the drive of the actuator, the mechanism has a first, a second, and an intermediate state. When switching from the intermediate state to the first and second states, different limit components play a role, and the swing amplitude is correspondingly reduced until it is locked when the state is switched. The first and second states have strong functionality and need to be stable, and the intermediate state can swing to improve the sitting feel; the limit component that swings with it has the advantages of avoiding interference and jamming.

[0005] The technical solution of the present invention is achieved in this way: A mechanism whose swinging ability changes with state switching comprises an actuator and two symmetrically arranged mechanical extension units, including: A state switching component configured to change shape under the action of an actuator to switch states; A swing assembly, on which the state switching assembly is arranged, and the swing assembly is configured to make the state switching assembly swing forward and backward on the swing assembly in response to an external force; the swing assembly comprises a fixed seat and two groups of swing units arranged at intervals on the left and right, each group of swing units comprises at least two swing members arranged at intervals on the front and back, the swing members suspend the state switching assembly on the fixed seat, and at least two groups of limit members arranged at intervals on the front and back are arranged between the swing unit and the state switching assembly; The limiting assembly includes a limiting member and a limiting groove, wherein the limiting member is arranged on one of the swinging member or the state switching assembly, and the limiting groove is arranged on the other of the swinging member or the state switching assembly; the limiting groove includes a swinging space and a locking end, and the swinging space is configured such that its size gradually decreases when approaching the locking end; An actuator is configured to control state switching; under the drive of the actuator, the mechanism has at least a first state and a second state, and there is an intermediate state between the first state and the second state; when the mechanism is in the intermediate state, the limiting members of each group of limiting assemblies are located in the swinging space of the limiting groove, and the state switching assembly can swing back and forth in response to external force; when the mechanism switches from the intermediate state to the first state, the limiting members of one group of limiting assemblies gradually move from the swinging space toward the locking end, the swinging amplitude of the state switching assembly gradually decreases and stops swinging after the limiting member enters the locking end of the limiting groove; when the mechanism switches from the intermediate state to the second state, the limiting members of the other group of limiting assemblies gradually move from the swinging space toward the locking end, the swinging amplitude of the state switching assembly also gradually decreases and stops swinging after the limiting member enters the locking end of the limiting groove; and the driving direction of the actuator when switching from the intermediate state to the first state is opposite to the driving direction of the actuator when switching from the intermediate state to the second state.

[0006] The first state and the second state are two different states. The actuator is generally an electric push rod, which is divided into the first state and the second state according to the telescopic stroke of the actuator. The actuator is extended to the longest state in the first state, and the actuator is shortened to the shortest state in the second state. The state between the first state and the second state is the intermediate state. Therefore, the first state and the second state are two completely different states, which can be selected to adapt to specific application scenarios. For example, the first state is an assisted standing state, the second state is a lying state, and the intermediate state is a sitting state, which can also include a TV posture state. The first and second states are more functional than the intermediate state, requiring the mechanism to stop swinging and remain stable, while in the intermediate state, it can swing as much as possible to increase the comfortable sitting feeling; because the actuator driving directions are different when switching to the first and second states, different limit components need to be set to ensure that locking can be achieved in both states.

[0007] The limit groove occupies a certain space. When the limit member approaches the locking end, the movable space of the limit member is reduced until it is locked; that is, when switching to the first and second states, the limit member gradually approaches the locking end, the space gradually decreases, and the swing angle also gradually decreases.

[0008] The state switching component is a mechanical extension device, which is mainly composed of a number of connecting rods; the size of the swing angle reflects the strength of the swing ability; the swing ability gradually changes with the state switching, especially when switching from the intermediate state to the first and second states, the swing ability gradually weakens. If the limit groove is set on the fixed seat instead of the two swinging parts, then this gradually weakening effect cannot be achieved. Instead, motion interference may occur, causing the mechanism to get stuck, damaging the mechanism components and affecting the service life; since both the swinging part and the state switching component can swing, the limit component set between the swinging part and the state switching component can also swing accordingly, and the limit component that swings can transition smoothly to prevent interference and jamming.

[0009] Preferably, there are two swinging members, namely the first swinging member and the second swinging member, and there are two limit assemblies, namely the first limit assemblies and the second limit assemblies; a first limit assemblies is arranged between the first swinging member and the state switching assembly, a second limit assemblies is arranged between the second swinging member and the state switching assembly, and the first limit assemblies and the second limit assemblies are arranged in a front-to-back interval; the first limit assemblies include a first limit assemblies and a first limit groove, the first limit assemblies are arranged on the state switching assembly, the first limit grooves are arranged on the first swinging member, and the first limit grooves include a first swinging space and a first locking end; the second limit assemblies include a second limit assemblies and a second limit groove, the second limit assemblies are arranged on the state switching assembly, the second limit grooves are arranged on the second swinging member, and the second limit grooves include a second swinging space and a second locking end.

[0010] Preferably, the first swinging member is a fan-shaped plate member, including a first connecting rod portion and a first extension portion, the first connecting rod portion is hinged to the fixed seat and the state switching assembly, and the first limiting groove is opened on the first extension portion; the first limiting groove is T-shaped, the first swinging space is arc-shaped, and the first locking end extends in the middle of the first swinging space toward the rotation connection point between the first connecting rod portion and the state switching assembly.

[0011] Preferably, the state switching component includes a mechanical extension unit and a lifting component, and the lifting component is configured to switch the mechanism between the intermediate state and the first state; the lifting component includes a first lifting member, a second lifting member and a base, the mechanical extension unit includes a main support member as a main body support, one end of the first lifting member and the second lifting member are both rotatably connected to the base, and the other end of the first lifting member and the second lifting member are both rotatably connected to the main support member; the first limit member is arranged on the first lifting member, and the rotation points of the first limit member, the first lifting member and the main support member are located on both sides of the rotation point of the first lifting member and the base; the first swinging member is located on the side of the first lifting member, the first limit member protrudes from the first lifting member toward the first swinging member, and the first limit member protrudes into the first limit groove.

[0012] Preferably, in the intermediate state, the first lifting member and the second lifting member are approximately horizontally facing forward. When switching from the intermediate state to the first state, the first lifting member and the second lifting member are tilted upward, and the angles between the base and the first lifting member and the second lifting member increase; the length of the first lifting member is smaller than the length of the second lifting member. When switching from the intermediate state to the first state, the rotation angle of the first lifting member is greater than the rotation angle of the second lifting member, and the main support member is lifted upward while tilting and rotating forward. Under the action of the actuator, the first lifting member and the second lifting member are lifted to achieve switching from the sitting state to the auxiliary standing state. After the mechanical extension unit is raised in height, the user can more conveniently get up from the seat; when switching from the sitting state to the auxiliary standing state, the posture of the mechanical extension unit is not only lifted upward, but also rotated to tilt forward, so that the user can more conveniently get up from the seat.

[0013] Preferably, in the left-right direction, the state switching component is sleeved on the outside of the swing component, and the mechanical extension unit is located outside the lifting component.

[0014] Preferably, the second swinging member includes a second connecting rod portion and a second extension portion, the second connecting rod portion is hinged to the fixed seat and the state switching assembly, the second limiting groove is open on the second extension portion, the second swinging space is located outside the second extension portion, and the second locking end is recessed on the second extension portion.

[0015] Preferably, the state switching assembly includes a mechanical extension unit, which includes a back connecting rod assembly and a main support member serving as the main body support. The back connecting rod assembly is arranged on the main support member, and the back connecting rod assembly includes a back connecting member, a first back connecting rod and a second back connecting rod. The back connecting member is used to connect the backrest, and the back connecting member is rotatably connected to the main support member. One end of the first back connecting rod is rotatably connected to the main support member, and the other end is rotatably connected to the back connecting member. The two ends of the second back connecting rod are rotatably connected to the back connecting member and the first back connecting rod respectively; the second limit member is arranged on the first back connecting rod, and the rotation connection points of the second limit member, the first back connecting rod and the second back connecting rod are located on both sides of the rotation connection point between the first back connecting rod and the back connecting member; the first back connecting rod is located on the side of the second swinging member, and the second limit member protrudes from the first back connecting rod toward the second swinging member.

[0016] Preferably, the first state is the assisted standing state, the second state is the lying state, and the intermediate state includes the sitting state and the TV state, and the TV state is between the sitting state and the lying state. In different states, the swinging effect is different. In the sitting state, it has the ability to swing completely, but in the lying state and the assisted standing state, it needs to remain stable and lock the swing; and when the sitting state switches to the lying state or the standing state, the swinging ability gradually weakens until it is completely locked, that is, when the sitting state switches to the TV state, the swinging ability weakens, and when it further switches to the lying state, the swing is locked.

[0017] Preferably, in the intermediate state, the mechanism also has an initial state, in which the state switching component naturally remains stationary on the swing component; in the initial state, the first swinging member tilts backward and the second swinging member tilts forward. When the state switching component swings backward, the whole body tilts backward, and when it swings forward, the whole body tilts forward, which is closer to the sitting feeling of a rocking chair.

[0018] The design starting point, concept and beneficial effects of the present invention using the above technical solution are: 1. The first state and the second state are two different states. The actuator is generally an electric push rod, which is divided into the first state and the second state according to the telescopic stroke of the actuator. The actuator is extended to the longest state in the first state, and the actuator is shortened to the shortest state in the second state. The state between the first state and the second state is the intermediate state. Therefore, the first state and the second state are two completely different states, which can be selected to adapt to specific application scenarios. For example, the first state is an assisted standing state, the second state is a lying state, and the intermediate state is a sitting state, which can also include a TV posture state. The first and second states are more functional than the intermediate state, requiring the mechanism to stop swinging and remain stable, while in the intermediate state, it can swing as much as possible to increase the comfortable sitting feeling; because the actuator driving directions are different when switching to the first and second states, different limit components need to be set to ensure that each of the two states can be locked.

[0019] 2. The limit groove occupies a certain space. When the limit member approaches the locking end, the movable space of the limit member decreases until it is locked; that is, when switching to the first and second states, the limit member gradually approaches the locking end, the space gradually decreases, and the swing angle also gradually decreases.

[0020] 3. The state switching component is a mechanical extension device, which is mainly composed of a number of connecting rods; the size of the swing angle reflects the strength of the swing ability; the swing ability gradually changes with the state switching, especially when switching from the intermediate state to the first and second states, the swing ability gradually weakens. If the limit groove is set on the fixed seat instead of the two swinging parts, then this gradually weakening effect cannot be achieved. Instead, motion interference may occur, causing the mechanism to get stuck, damaging the mechanism components and affecting the service life; since both the swinging part and the state switching component can swing, the limit component set between the swinging part and the state switching component can also swing accordingly, and the limit component that swings can transition smoothly to prevent interference and jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the mechanism in the embodiment of the present invention when it is in a sitting state; Figure 2 is a cross-sectional view of the mechanism in the embodiment of the present invention when it is in a sitting position and swinging forward; Figure 3 is a cross-sectional view of the mechanism in the embodiment of the present invention when it is in a sitting position and swinging backward; Figure 4 It is a schematic diagram of the three-dimensional structure of the swing assembly in the embodiment of the present invention; Figure 5 is a cross-sectional view of the mechanism in an embodiment of the present invention when it is in an auxiliary standing state; Figure 6 is a cross-sectional view of the mechanism in the embodiment of the present invention in a lying state; Figure 7 It is a schematic diagram of the three-dimensional structure of the mechanism in the embodiment of the present invention when it is in the auxiliary standing state; Figure 8 is a cross-sectional view of the mechanism in the embodiment of the present invention when it is in a sitting position; Fig. 9 It is a schematic diagram of the three-dimensional structure of the mechanism in the embodiment of the present invention in a lying state; Fig.10 It is an exploded view of the mechanism in the embodiment of the present invention.

[0022] The figures are marked as follows: mechanical extension unit 1; lifting assembly 2; swing assembly 3; actuator 4; drive tube 41; first armrest mounting member 5; second armrest mounting member 6; fixed seat 7; fixed frame 71; front heightening seat 72; rear heightening seat 73; first swinging member 8; first connecting rod portion 81; first extension portion 82; second swinging member 9; second connecting rod portion 91; second extension portion 92; back connecting member 10; first back connecting rod 11; second back connecting rod 12; drive rod 13; main support member 14; first lifting member 15; second lifting member 16; base 17; connecting member 18; first limiting groove 19; first swinging space 191; first locking end 192; first limiting member 20; second limiting groove 21; second swinging space 211; second locking end 212; second limiting member 22. DETAILED DESCRIPTION

[0023] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0025] In the description of the present invention, the terms “first”, “second”, “third”, etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0026] The specific implementation of the present invention is as follows: like Figure 1-6 As shown, the present invention provides a mechanism whose swing capability changes with state switching, comprising: A state switching component, configured to change shape under the action of the actuator 4 to switch the state; The swing assembly 3, the state switching assembly is arranged on the swing assembly 3, and the swing assembly 3 is configured to make the state switching assembly swing back and forth on the swing assembly 3 in response to external force; the swing assembly 3 includes a fixed seat 7 and two groups of swing units arranged at intervals on the left and right, each group of swing units includes at least two swing members arranged at intervals on the front and back, and the swing members suspend the state switching assembly on the fixed seat 7, and at least two groups of limit members spaced at intervals on the front and back are arranged between the swing unit and the state switching assembly; The limiting assembly includes a limiting member and a limiting groove, wherein the limiting member is arranged on one of the swinging member or the state switching assembly, and the limiting groove is arranged on the other of the swinging member or the state switching assembly; the limiting groove includes a swinging space and a locking end, and the swinging space is configured such that its size gradually decreases when approaching the locking end; The actuator 4 is configured to control state switching; under the drive of the actuator 4, the mechanism has at least a first state and a second state, and there is an intermediate state between the first state and the second state; when the mechanism is in the intermediate state, the limiting members of each group of limiting assemblies are located in the swinging space of the limiting groove, and the state switching assembly can swing back and forth in response to external force; when the mechanism switches from the intermediate state to the first state, the limiting members of one group of limiting assemblies gradually move from the swinging space toward the locking end, the swinging amplitude of the state switching assembly gradually decreases and stops swinging after the limiting member enters the locking end of the limiting groove; when the mechanism switches from the intermediate state to the second state, the limiting members of the other group of limiting assemblies gradually move from the swinging space toward the locking end, the swinging amplitude of the state switching assembly also gradually decreases and stops swinging after the limiting member enters the locking end of the limiting groove; and the driving direction of the actuator 4 when switching from the intermediate state to the first state is opposite to the driving direction of the actuator 4 when switching from the intermediate state to the second state.

[0027] The first state and the second state are two different states. The actuator 4 is generally an electric push rod, which is divided into the first state and the second state according to the telescopic stroke of the actuator 4. The actuator 4 is extended to the longest state in the first state, and the actuator 4 is shortened to the shortest state in the second state. The state between the first state and the second state is the intermediate state. Therefore, the first state and the second state are two completely different states, which can be selected to adapt to specific application scenarios. For example, the first state is an assisted standing state, the second state is a lying state, and the intermediate state is a sitting state, which can also include a TV posture state. The first and second states are more functional than the intermediate state, requiring the mechanism to stop swinging and remain stable, while in the intermediate state, it can swing as much as possible to increase the comfortable sitting feeling; because the driving directions of the actuator 4 are different when switching to the first and second states, different limit components need to be set to ensure that locking can be achieved in both states.

[0028] The limit groove occupies a certain space. When the limit member approaches the locking end, the movable space of the limit member is reduced until it is locked; that is, when switching to the first and second states, the limit member gradually approaches the locking end, the space gradually decreases, and the swing angle also gradually decreases.

[0029] The state switching component is a mechanical extension device, which is mainly composed of a number of connecting rods; the size of the swinging angle reflects the strength of the swinging ability; the swinging ability gradually changes with the state switching, especially when switching from the intermediate state to the first and second states, the swinging ability gradually weakens. If the limit groove is set on the fixed seat 7 instead of the two swinging parts, then this gradually weakening effect cannot be achieved. On the contrary, motion interference may occur, causing the mechanism to get stuck, damaging the mechanism components, and affecting the service life; since both the swinging part and the state switching component can swing, the limit component set between the swinging part and the state switching component can also swing accordingly, and the limit component that swings can transition smoothly to prevent interference and jamming; the specific structure of the mechanical extension device is not repeated here, and please refer to CN202410179965.5.

[0030] In summary, the mechanism is applied to electric sofas, and the state switching component, i.e., the mechanical extension device, realizes the conversion between different states when the internal connecting rod moves; the swing component 3 provides basic support and flexible movement conditions for the swing of the mechanism, and the state switching component is stably arranged on the swing component 3, and can make the state switching component respond to the action of external force and swing freely back and forth thereon; the actuator 4, as the "power engine" of the entire mechanism, is configured to accurately control the switching of states, and divides the electric push rod into a first state, an intermediate state, and a second state from long to short, which are equivalent to an assisted standing state, a sitting state, a TV posture state, and a lying state; in the limit assembly, the limit groove cleverly limits the range of motion of the limit member, thereby realizing the control of the swing amplitude of the state switching assembly.

[0031] Furthermore, in this embodiment, the first state is the assisted standing state, the second state is the lying state, and the intermediate state includes the sitting state and the TV state, and the TV state is between the sitting state and the lying state. In different states, the swinging effect is different. In the sitting state, it has the ability to swing completely, but in the lying and assisted standing states, it needs to remain stable and lock the swing; and when the sitting state switches to the lying state or the standing state, the swinging ability gradually weakens until it is completely locked, that is, when the sitting state switches to the TV state, the swinging ability weakens, and when it further switches to the lying state, the swinging is locked.

[0032] The mechanical extension device, the first swing member 8, the second swing member 9 and the fixed seat 7 constitute a four-bar linkage for swinging. The swing base can drive the entire mechanical extension device to swing, thereby giving the seat the ability to swing, which is more in line with the rocking chair experience preferred by the elderly. The mechanical extension device can still switch its original state to achieve its rich functionality, especially the assisted standing function. Therefore, the improvement of this seat is particularly aimed at the elderly, and is more in line with the elderly's usage preferences and assisted standing function. Its uniqueness improves its competitiveness and increases market share.

[0033] Further details on the specific structural features of the institution: First, the swing assembly 3 is described. Specifically, Figure 2-4 As shown in Figures 10, the fixed seat 7 includes a fixed frame 71, a front elevated seat 72 and a rear elevated seat 73. The front elevated seat 72 and the rear elevated seat 73 are both fixedly connected to the fixed frame 71 and protrude upward from the fixed frame 71. There are two swing members, namely a first swing member 8 and a second swing member 9. There are two limit assemblies, namely a first limit assembly and a second limit assembly. A first limit assembly is provided between the first swing member 8 and the state switching assembly, a second limit assembly is provided between the second swing member 9 and the state switching assembly, and the first limit assembly and the second limit assembly are provided. Arranged with intervals in front and back; the first limiting assembly includes a first limiting member 20 and a first limiting groove 19, the first limiting member 20 is arranged on the state switching assembly, the first limiting groove 19 is arranged on the first swinging member 8, the first limiting groove 19 includes a first swinging space 191 and a first locking end 192; the second limiting assembly includes a second limiting member 22 and a second limiting groove 21, the second limiting member 22 is arranged on the state switching assembly, the second limiting groove 21 is arranged on the second swinging member 9, the second limiting groove 21 includes a second swinging space 211 and a second locking end 212.

[0034] The first swinging member 8 is a fan-shaped plate member, including a first connecting rod portion 81 and a first extension portion 82. The first connecting rod portion 81 is hinged to the fixed seat 7 and the state switching assembly, that is, the upper end of the first connecting rod portion 81 is hinged to the upper end of the front heightening seat 72, and the lower end of the first connecting rod portion 81 is hinged to the state switching assembly. The first limiting groove 19 is provided on the first extension portion 82; the first limiting groove 19 is T-shaped, the first swinging space 191 is arc-shaped, and the first locking end 192 extends in the middle of the first swinging space 191 toward the rotation connection point between the first connecting rod portion 81 and the state switching assembly; the second swinging member 9 includes It includes a second connecting rod portion 91 and a second extending portion 92, the second connecting rod portion 91 is hinged to the fixed seat 7 and the state switching component, that is, the upper end of the second connecting rod portion 91 is hinged to the upper end of the rear elevated seat 73, and the lower end of the second connecting rod portion 91 is hinged to the state switching component, the second limiting groove 21 is open on the second extending portion 92, the second swinging space 211 is located outside the second extending portion 92, and the second locking end 212 is recessed on the second extending portion 92; the first swinging member 8 and the second swinging member 9 are both drooped on the fixed seat 7, so that the overall height of the seat can be reduced to make the structure more compact.

[0035] In the intermediate state, that is, in the sitting state and the TV state, the mechanism also has an initial state. In the initial state, the state switching component is naturally still on the rocking component 3, and the initial state is the state when it is not swinging; in the initial state, the first swinging member 8 tilts backward and the second swinging member 9 tilts forward. Through such an arrangement, when the state switching component swings backward, the whole body tilts backward, and when it swings forward, the whole body tilts forward, which is closer to the sitting feeling of a rocking chair.

[0036] The mechanical stretching device is described below. Specifically, Figure 1 , 7-As shown in Figure 10, the state switching component includes a mechanical extension unit 1 and a lifting component 2. There are two mechanical extension units 1. The two mechanical extension units 1 are spaced apart from each other and symmetrically arranged on the lifting component 2. The lifting component 2 is configured to switch the mechanism between a sitting state and an assisted standing state; the lifting component 2 includes a first lifting member 15, a second lifting member 16 and a base 17. The mechanical extension unit 1 includes a back connecting rod assembly, a driving rod 13 and a main supporting member 14 as a main body support; the front end of the actuator 4 is rotatably connected to a driving tube 41 arranged on the left and right, and the driving tube 41 is fixedly connected to the driving rod 13. The driving rod 13 is arranged in the front-to-back direction and serves as an active member in the mechanical extension unit 1. The rear end of the actuator 4 is rotatably connected to the base 17. The back connecting rod assembly is arranged on the main support member 14, and the back connecting rod assembly includes a back connecting member 10, a first back connecting rod 11 and a second back connecting rod 12. The back connecting member 10 is used to connect the backrest, and the back connecting member 10 is rotatably connected to the main support member 14. One end of the first back connecting rod 11 is rotatably connected to the main support member 14, and the other end is rotatably connected to the back connecting member 10. The two ends of the second back connecting rod 12 are rotatably connected to the back connecting member 10 and the first back connecting rod 11 respectively. The driving rod 13 is also rotatably connected to the first back connecting rod 11 to drive the back connecting rod assembly to move. In the mechanical extension device, the mechanical extension unit 1, the first lifting member 15, the second lifting member 16 and the base 17 constitute a four-bar linkage for realizing auxiliary standing.

[0037] The rear ends of the first lifting member 15 and the second lifting member 16 are both rotatably connected to the base 17, and the front ends of the first lifting member 15 and the second lifting member 16 are both rotatably connected to the main supporting member 14, and the second lifting member 16 is located as a whole above and behind the first lifting member 15, and the rotation point of the second lifting member 16 and the base 17 is higher than the rotation point of the first lifting member 15 and the base 17; in the intermediate state, the first lifting member 15 and the second lifting member 16 are roughly horizontally facing forward, and when switching from the intermediate state to the first state, the first lifting member 15 and the second lifting member 16 are tilted upward, and the angles between the base 17 and the first lifting member 15 and the second lifting member 16 increase; the first lifting member 15 and the second lifting member 16 are tilted upward, and the angles between the base 17 and the first lifting member 15 and the second lifting member 16 increase. The length of the lifting member 15 is smaller than that of the second lifting member 16. When switching from the intermediate state to the first state, the rotation angle of the first lifting member 15 is greater than the rotation angle of the second lifting member 16, and the main support member 14 is lifted upward while tilting and rotating forward; under the action of the actuator 4, the first lifting member 15 and the second lifting member 16 are lifted to achieve switching from the sitting state to the assisted standing state. After the mechanical extension unit 1 is highly raised, the user can get up from the seat more conveniently; when switching from the sitting state to the assisted standing state, the posture of the mechanical extension unit 1 is not only lifted upward, but also rotates forward tilted, so that the user can get up from the seat more conveniently.

[0038] The two mechanical extension units 1 are provided with a seat frame for installing a seat part; a first armrest mounting member 5 is provided on the seat frame, and a second armrest mounting member 6 is provided on the base 17. The first armrest mounting member 5 is configured to install a first armrest that is lifted or lowered together with the mechanical extension unit 1; the second armrest mounting member 6 is configured to install a second armrest; both the first and second armrests can swing back and forth with the mechanical extension device. Due to the different installation positions of the first and second armrests, the second armrest acts as an armrest similar to a traditional sofa, and the first armrest can be lifted together with the mechanical extension unit 1, so that the user can lean on it to get up conveniently, further improving the auxiliary standing function.

[0039] Finally, the limiter is supplemented. Specifically, Figure 1-3 As shown in Figures 5, 6 and 10, the first limiting member 20 and the second limiting member 22 are both columnar, and the first limiting member 20 is arranged on the first lifting member 15, and the rotation points of the first limiting member 20, the first lifting member 15 and the main support member 14 are located on both sides of the rotation point of the first lifting member 15 and the base 17; the first swinging member 8 is located beside the first lifting member 15, and the first limiting member 20 protrudes from the first lifting member 15 toward the first swinging member 8, and the first limiting member 20 protrudes into the first limiting groove 19; the second limiting member 22 is arranged on the first back link 11, and the rotation connection points of the second limiting member 22, the first back link 11 and the second back link 12 are located on both sides of the rotation connection point of the first back link 11 and the back connecting member 10; the first back link 11 is located beside the second swinging member 9, and the second limiting member 22 protrudes from the first back link 11 toward the second swinging member 9.

[0040] In addition, a connecting piece 18 is provided at the lower end of the base 17. The connecting piece 18 is L-shaped and includes an integrally formed connecting ear and a mounting portion. The mounting portion is arranged horizontally and fixedly connected to the lower end surface of the base 17, and the connecting ear is arranged vertically and rotatably connected to the first swing member 8 or the second swing member 9. The base 17 serves as the main support of the mechanical extension device, and the swing base can act on the entire mechanical extension device. When swinging, the entire mechanical extension device can swing. In the left and right directions, the state switching component is sleeved on the outside of the swing component 3, and the mechanical extension unit 1 is located outside the lifting component 2, making the structure more compact.

Claims

1. A mechanism whose swinging ability changes with state switching, characterized in that: include: A state switching component configured to change shape under the action of an actuator to switch states; A swing assembly, on which the state switching assembly is arranged, and the swing assembly is configured to make the state switching assembly swing forward and backward on the swing assembly in response to an external force; the swing assembly comprises a fixed seat and two groups of swing units arranged at intervals on the left and right, each group of swing units comprises at least two swing members arranged at intervals on the front and back, the swing members suspend the state switching assembly on the fixed seat, and at least two groups of limit members arranged at intervals on the front and back are arranged between the swing unit and the state switching assembly; The limiting assembly includes a limiting member and a limiting groove, wherein the limiting member is arranged on one of the swinging member or the state switching assembly, and the limiting groove is arranged on the other of the swinging member or the state switching assembly; the limiting groove includes a swinging space and a locking end, and the swinging space is configured such that its size gradually decreases when approaching the locking end; An actuator is configured to control state switching; under the drive of the actuator, the mechanism has at least a first state and a second state, and there is an intermediate state between the first state and the second state; when the mechanism is in the intermediate state, the limiting members of each group of limiting assemblies are located in the swinging space of the limiting groove, and the state switching assembly can swing back and forth in response to external force; when the mechanism switches from the intermediate state to the first state, the limiting members of one group of limiting assemblies gradually move from the swinging space toward the locking end, the swinging amplitude of the state switching assembly gradually decreases and stops swinging after the limiting member enters the locking end of the limiting groove; when the mechanism switches from the intermediate state to the second state, the limiting members of the other group of limiting assemblies gradually move from the swinging space toward the locking end, the swinging amplitude of the state switching assembly also gradually decreases and stops swinging after the limiting member enters the locking end of the limiting groove; and the driving direction of the actuator when switching from the intermediate state to the first state is opposite to the driving direction of the actuator when switching from the intermediate state to the second state.

2. The mechanism according to claim 1, wherein the swinging ability varies with the state switching, is characterized in that: There are two swinging parts, namely the first swinging part and the second swinging part, and there are two limit assemblies, namely the first limit assemblies and the second limit assemblies; the first limit assemblies are arranged between the first swinging part and the state switching assembly, and the second limit assemblies are arranged between the second swinging part and the state switching assembly, and the first limit assemblies and the second limit assemblies are arranged in a front-to-back interval; the first limit assemblies include a first limit assemblies and a first limit groove, the first limit assemblies are arranged on the state switching assembly, the first limit grooves are arranged on the first swinging part, and the first limit grooves include a first swinging space and a first locking end; the second limit assemblies include a second limit assemblies and a second limit groove, the second limit assemblies are arranged on the state switching assembly, the second limit grooves are arranged on the second swinging part, and the second limit grooves include a second swinging space and a second locking end.

3. The mechanism according to claim 2, wherein the swinging ability varies with the state switching, is characterized in that: The first swinging member is a fan-shaped plate member, including a first connecting rod portion and a first extension portion. The first connecting rod portion is hinged to a fixed seat and a state switching component, and the first limiting groove is arranged on the first extension portion; the first limiting groove is T-shaped, the first swinging space is arc-shaped, and the first locking end extends in the middle of the first swinging space toward a rotation connection point between the first connecting rod portion and the state switching component.

4. The mechanism of claim 3, wherein the swinging ability varies with state switching, is characterized in that: The state switching component includes a mechanical extension unit and a lifting component, and the lifting component is configured to switch the mechanism between the intermediate state and the first state; the lifting component includes a first lifting member, a second lifting member and a base, and the mechanical extension unit includes a main support member as a main body support, one end of the first lifting member and the second lifting member are both rotatably connected to the base, and the other end of the first lifting member and the second lifting member are both rotatably connected to the main support member; the first limit member is arranged on the first lifting member, and the rotation points of the first limit member, the first lifting member and the main support member are located on both sides of the rotation point of the first lifting member and the base; the first swinging member is located on the side of the first lifting member, the first limit member protrudes from the first lifting member toward the first swinging member, and the first limit member protrudes into the first limit groove.

5. The mechanism of claim 4, wherein the swinging ability varies with state switching, is characterized in that: In the intermediate state, the first lifting member and the second lifting member are roughly horizontally facing forward. When switching from the intermediate state to the first state, the first lifting member and the second lifting member are tilted upward, and the angles between the base and the first lifting member and the second lifting member increase; the length of the first lifting member is smaller than the length of the second lifting member. When switching from the intermediate state to the first state, the rotation angle of the first lifting member is greater than the rotation angle of the second lifting member, and the main support member is lifted upward and rotates forward while tilting.

6. The mechanism of claim 4, wherein the swinging ability varies with state switching, is characterized in that: In the left and right directions, the state switching component is mounted outside the swing component, and the mechanical extension unit is located outside the lifting component.

7. The mechanism of claim 2, wherein the swinging ability varies with state switching, is characterized in that: The second swinging member includes a second connecting rod portion and a second extension portion. The second connecting rod portion is hinged to the fixing seat and the state switching assembly. The second limiting groove is open on the second extension portion. The second swinging space is located outside the second extension portion. The second locking end is recessed on the second extension portion.

8. The mechanism of claim 7, wherein the swinging ability varies with state switching, is characterized in that: The state switching assembly includes a mechanical extension unit, which includes a back connecting rod assembly and a main support member serving as the main body support. The back connecting rod assembly is arranged on the main support member, and the back connecting rod assembly includes a back connecting member, a first back connecting rod and a second back connecting rod. The back connecting member is used to connect the backrest, and the back connecting member is rotatably connected to the main support member. One end of the first back connecting rod is rotatably connected to the main support member, and the other end is rotatably connected to the back connecting member. The two ends of the second back connecting rod are rotatably connected to the back connecting member and the first back connecting rod respectively; the second limit member is arranged on the first back connecting rod, and the rotation connection points of the second limit member, the first back connecting rod and the second back connecting rod are located on both sides of the rotation connection point between the first back connecting rod and the back connecting member; the first back connecting rod is located on the side of the second swinging member, and the second limit member protrudes from the first back connecting rod toward the second swinging member.

9. The mechanism of claim 1, wherein the swinging ability varies with state switching, is characterized in that: The first state is an assisted standing state, the second state is a lying state, and the intermediate states include a sitting state and a TV state, and the TV state is between the sitting state and the lying state.

10. The mechanism of claim 1, wherein the swinging ability varies with state switching, is characterized in that: In the intermediate state, the mechanism also has an initial state, in which the state switching component naturally rests on the swing component; in the initial state, the first swinging member tilts backwards and the second swinging member tilts forwards.

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