Chair with linked waist and back

Abstract

The utility model provides a waist and back linkage seat, which comprises a chassis, a waist support assembly and a back support assembly, the chassis extends upwards to form an armrest seat, the waist support assembly is rotatably connected to the armrest seat, the other position of the armrest seat is rotatably connected with a back rotating support, and the back rotating support is rotatably connected to the back support assembly. The back supporting assembly is rotationally connected with the back rotating support and the waist supporting assembly at different positions, and the back rotating support, the back supporting assembly, the waist supporting assembly and the armrest base form a four-bar mechanism. When the back supporting assembly and the waist supporting assembly are stressed and tilt backwards, the rotating angle of the back supporting assembly is smaller than the rotating angle of the waist supporting assembly under the action of the four-connecting-rod mechanism, and the included angle between the back supporting assembly and the waist supporting assembly is reduced. When the back supporting assembly still roughly supports the back of the human body forwards, the waist supporting assembly supports the waist of the human body obliquely forwards and upwards, the posture that the waist of the human body is more inclined than the back at the moment is adapted, the waist is effectively supported, and the empty waist condition is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of furniture, especially a seat with waist and back linkage. BACKGROUND

[0002] As one of the most common furniture, the seat is improved more and more maturely in comfort, such as dividing the traditional chair back into waist rest and back rest, supporting the human back and waist in pertinence, so that the waist rest and back rest adapt to the different curves of the waist and back, make them more fit the waist and back, and provide more comfortable waist and back support.

[0003] However, only supporting the waist and back respectively cannot meet the comfort demand of the user, especially when lying back, the waist rest rotates with the back rest, cannot realize overall support to the human waist, and the long-term empty waist can cause the user waist fatigue, even cause the health problem of the waist, so a seat with waist and back linkage and separate linkage is needed to realize effective support to the waist. SUMMARY

[0004] In order to solve the above technical problems, the utility model provides a seat with waist and back linkage, which is composed of a handrail seat, a waist support assembly, a back rotating support, and a back support assembly to form a four-bar linkage mechanism for realizing waist and back linkage. When the user lies down, the back rotating support and the waist support assembly rotate backward and downward on the handrail seat, thereby driving the back support assembly to rotate backward and upward, and the rotation angle of the back support assembly is smaller than that of the waist support assembly. The larger rotation angle of the waist support assembly enables it to support the human waist more obliquely forward and upward. When the user lies down, the waist needs more oblique support than the back, which adapts to the more oblique posture of the human waist than the back, effectively supports the waist, and prevents the empty waist condition.

[0005] The technical solution of the utility model is as follows:

[0006] A seat with waist and back linkage includes a chassis, a waist support assembly, and a back support assembly. The chassis extends upward with a handrail seat. The waist support assembly is rotationally connected to the handrail seat. A back rotating support is rotationally connected to another position of the handrail seat. The back support assembly is rotationally connected to the back rotating support and the waist support assembly at different positions. The back rotating support, the back support assembly, the waist support assembly, and the handrail seat form a four-bar linkage mechanism. When the back support assembly and the waist support assembly are forced to lean backward, the rotation angle of the back support assembly is smaller than that of the waist support assembly under the action of the four-bar linkage mechanism, and the included angle between the back support assembly and the waist support assembly decreases.

[0007] The four-bar linkage mechanism for realizing waist-back linkage is composed of the armrest seat, the waist support assembly, the back rotating support and the back support assembly. When a user lies down, the back rotating support and the waist support assembly rotate backward and downward on the armrest seat, thereby driving the back support assembly to rotate backward and upward, and the rotating angle of the back support assembly is smaller than that of the waist support assembly, that is, while the back support assembly is still roughly oriented forward to support the back of the human body, the waist support assembly has already supported the waist of the human body obliquely upward, so that the human body needs more inclined support for the waist than the back when lying down, which adapts to the posture that the waist of the human body is more inclined than the back, so that the waist is effectively supported and the empty waist condition is prevented, thereby preventing the waist from being tired and healthy problems.

[0008] Preferably, the waist support assembly is located above and forward of the back rotating support, and the rotating point of the waist support assembly and the armrest seat is located above and forward of the rotating point of the back rotating support and the armrest seat. This is the basis for realizing the arrangement of the four-bar linkage mechanism and the preset motion track.

[0009] Preferably, the upper part of the waist support assembly is rotationally connected with the middle part of the back support assembly, and the lower end of the back support assembly is rotationally connected with the upper end of the back rotating support. When the middle and lower part of the back support assembly rotates, the entire back support assembly is driven to rotate, thereby changing the support direction for the back and adapting to the posture of the back when the user lies backward.

[0010] Preferably, the seat is slidingly arranged on the base plate, and the seat is rotationally connected with the waist support assembly. When the back support assembly and the waist support assembly are inclined backward, the seat slides forward on the base plate. When the waist-back linkage is realized, the seat also links together, which adapts to the change that the hips move forward when the human body lies down, and the use feels more comfortable; when the human body is inclined backward, the hips do not need to be moved on the seat to achieve a more comfortable posture.

[0011] Preferably, the rotating point of the waist support assembly and the seat is located below and rearward of the rotating point of the waist support assembly and the armrest seat. Since the rotating point of the waist support assembly and the seat is lower, when the waist support assembly rotates backward, the lower end thereof rotates forward to push the seat to move forward.

[0012] Preferably, an arc-shaped guide groove is formed in the armrest seat beside the rotating point of the waist support assembly and the seat, the waist support assembly and the seat are rotationally connected through a rotating shaft, and the rotating shaft is inserted into the guide groove. The guide groove guides and limits the sliding of the seat, and also limits the rotation of the waist support assembly, so that the linkage of the waist-back seat is realized within a suitable range.

[0013] As preferred, the waist support assembly comprises a waist connecting piece, a waist back frame configured to fit the human waist, the waist back frame being fixedly connected with a rotating frame, the rotating frame being rotatably connected with the waist connecting piece; the waist connecting piece is rotatably connected with the armrest base and the back support assembly. The waist back frame further has a self-adapting rotating function to further follow the human waist posture to provide more comfortable fitting and support, and to be more ergonomic.

[0014] As preferred, a damping gasket is arranged between the waist connecting piece and the rotating frame, and the waist connecting piece and the rotating frame are in abutment with the damping gasket. The damping gasket increases the friction between the waist connecting piece and the rotating frame, so that the waist back frame is kept without force, and will not always sag downward due to gravity.

[0015] As preferred, the back rotating support is a U-shaped frame with a hollow.

[0016] The design starting point, concept and beneficial effects of the utility model with the above technical solutions are:

[0017] The armrest base, the waist support assembly, the back rotating support, and the back support assembly form a four-bar linkage mechanism to realize waist-back linkage. When a user lies down, the back rotating support and the waist support assembly rotate backward and downward on the armrest base, thereby driving the back support assembly to rotate backward and upward, and the rotating angle of the back support assembly is smaller than that of the waist support assembly, i.e., while the back support assembly still generally faces forward to support the human back, the waist support assembly has already inclined forward to support the human waist. When a user lies down, the waist needs more inclined support than the back, which adapts to the more inclined posture of the human waist than the back, so that the waist is effectively supported and the empty waist condition is prevented, thereby preventing the waist from being tired and having health problems. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 4 is a perspective view of the seat for a user to sit straight in an embodiment of the utility model;

[0019] Figure 2 Fig. 5 is a perspective view of the seat for a user to lie down in an embodiment of the utility model;

[0020] Figure 3 Fig. 6 is a side view of the seat for a user to sit straight in an embodiment of the utility model;

[0021] Figure 4 Fig. 7 is a side view of the seat for a user to lie down in an embodiment of the utility model;

[0022] Figure 5 Fig. 8 is a schematic view of the four-bar linkage mechanism motion of the seat in an embodiment of the utility model;

[0023] Figure 6 For Figure 5 Fig. 2 is a schematic view of angle change of the four-bar linkage mechanism in motion;

[0024] Figure 7 Fig. 4 is a schematic view of a three-dimensional structure of the back support assembly further rotating backward relative to the waist support assembly in the embodiment of the utility model.

[0025] The reference signs are as follows: bottom plate 1, waist support assembly 2, waist connecting piece 21, waist back frame 22, rotating frame 23, back support assembly 3, linkage piece 31, back frame 32, moving frame 33, back frame 34, armrest seat 4, back rotating support 5, seat part 6, damping gasket 7, sliding rotating piece 8, sliding groove 9, air rod 10, guide groove 11. DETAILED DESCRIPTION

[0026] In order to more clearly understand the above purpose, features and advantages of the utility model, the utility model will be further described in detail below in combination with the 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.

[0027] In the following description, many specific details are set forth in order to provide a thorough understanding of the utility model, however, the utility model can also be implemented in other ways different from the description herein, therefore, the protection scope of the utility model is not limited by the specific embodiments disclosed below.

[0028] In the description of the utility model, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0029] The specific embodiments of the utility model are as follows:

[0030] As Figures 1-5 shown, the utility model provides a seat of waist and back linkage, including bottom plate 1, waist support assembly 2 and back support assembly 3, the bottom plate 1 has the armrest seat 4 extending upward, the waist support assembly 2 is rotatably connected on the armrest seat 4, rotatably connected with the back rotating support 5 at another position of the armrest seat 4, and the back support assembly 3 is rotatably connected with the back rotating support 5 and the waist support assembly 2 at different positions respectively, and the back rotating support 5, the back support assembly 3, the waist support assembly 2 and the armrest seat 4 form a four-bar linkage mechanism;When the back support assembly 3 and the waist support assembly 2 are stressed and inclined backward, under the action of the four-bar linkage mechanism, the rotating angle of the back support assembly 3 is less than the rotating angle of the waist support assembly 2, and the included angle between the back support assembly 3 and the waist support assembly 2 is reduced.

[0031] The four-bar linkage mechanism for realizing waist and back linkage is formed by the armrest seat 4, the waist support assembly 2, the back rotating support 5 and the back support assembly 3. When a user lies down, the back rotating support 5 and the waist support assembly 2 rotate backward and downward on the armrest seat 4, thereby driving the back support assembly to rotate backward and upward, and the rotating angle of the back support assembly 3 is smaller than that of the waist support assembly 2, that is, while the back support assembly 3 still supports the back of the human body in a forward direction, the waist support assembly 2 supports the waist of the human body in a forward and upward direction. When the user lies down, the waist needs more inclined support than the back, which adapts to the posture that the waist is more inclined than the back, so that the waist is effectively supported and the empty waist condition is prevented, thereby preventing the waist from being tired and healthy problems.

[0032] Specifically, in the embodiment, the base plate 1 is used for connecting the support legs of the seat, that is, the gas springs for lifting the seat module; the seat part 6 is used for supporting the hips of the human body and is slidingly arranged on the base plate 1; the left and right ends of the base plate 1 are each fixedly provided with the armrest seat 4, the armrest seat 4 extends upward to exceed the seat part 6, and the seat part 6 is located between the two armrest seats 4; the waist support assembly 2 is located above and forward of the back rotating support 5, and the rotating connection point between the waist support assembly 2 and the armrest seat 4 is located above and forward of the rotating connection point between the back rotating support 5 and the armrest seat 4, which lays a foundation for the arrangement of the four-bar linkage mechanism and the preset motion track.

[0033] In addition, the seat part 6 is slidingly arranged on the base plate 1, the waist support assembly 2 is rotatably connected with the rear part of the seat part 6, and when the user sits straight, the rotating point between the waist support assembly 2 and the seat part 6 is located below and rearward of the rotating point between the waist support assembly 2 and the armrest seat 4. When the user lies backward, the waist support assembly 2 rotates backward while driving the seat part 6 to slide forward on the base plate 1. Because the rotating point between the waist support assembly 2 and the seat part 6 is lower, when the waist support assembly 2 rotates backward, the lower end of the waist support assembly 2 rotates forward to drive the seat part 6 to move forward. During the state switching, the seat part 6 also links together, which adapts to the change that the hips move forward when the human body lies down, and the use feels more comfortable. When the human body leans backward, the hips do not need to be moved on the seat part 6 to achieve a more comfortable posture. An arc-shaped guide groove 11 is formed in the armrest seat 4 beside the rotating point between the waist support assembly 2 and the seat part 6, the waist support assembly 2 and the seat part 6 are rotatably connected through a rotating shaft, and the rotating shaft is inserted into the guide groove 11.

[0034] Further, the upper part of the waist support assembly 2 is rotationally connected with the middle part of the back support assembly 3, and the lower end of the back support assembly 3 is rotationally connected with the upper end of the back rotation support 5; the waist support assembly 2 comprises a waist connecting piece 21, a waist back frame 22 and a rotation support 23, the waist back frame 22 is configured to fit the human waist, the waist back frame 22 is fixedly connected with the rotation support 23, and the rotation support 23 is rotationally connected with the waist connecting piece 21; the waist connecting piece 21 is rotationally connected with the armrest seat 4 and the back support assembly 3, and the seat part 6 is also rotationally connected with the waist connecting piece 21 and rotationally connected with the lower end of the waist connecting piece 21; the waist connecting piece 21 is a hollow frame structure, the waist back frame 22 is rotationally arranged on the waist connecting piece 21 through the rotation support 23 to have a self-adaptive rotation function, and can independently rotate relative to the waist connecting piece 21, so as to further rotate following the human waist posture, provide more comfortable fitting and support, and be more in line with ergonomics; a damping washer 7 is arranged between the waist connecting piece 21 and the rotation support 23, a long bolt is arranged as a rotation shaft between the waist connecting piece 21 and the rotation support 23, the damping washer 7 is sleeved on the long bolt, after the long bolt is tightened, the waist connecting piece 21 and the rotation support 23 are both in abutment with the damping washer 7, the damping washer 7 increases the friction between the waist connecting piece 21 and the rotation support 23, so that the waist back frame 22 is kept without force, and will not always sag downward due to gravity; in addition, the back rotation support 5 is also a hollow frame structure, and the back rotation support 5 is in a U shape, the left and right ends thereof are rotationally connected with the two armrest seats 4, and the middle part thereof is rotationally connected with the back support assembly 3.

[0035] As shown in Figure 5 , 6 , the structure is arranged to form the four-bar mechanism of the back rotation support 5, the waist connecting piece 21, the back support assembly 3 and the armrest seat 4, in the embodiment, the length proportion of the four-bar mechanism is arranged to make the rotation angle of the waist connecting piece 21 on the armrest seat 4 be 45°, the rotation angle of the back rotation support 5 on the armrest seat 4 be 48.3°, and the rotation angle of the back support assembly 3 on the back rotation support 5 be 17.5° when lying back, that is, the waist support assembly 2 rotates back by 45°, the back support assembly 3 only rotates back by 17.5°, and the included angle between the two is reduced by 27.5°, so as to form a smaller included angle to adapt to a more inclined human waist posture and provide more effective and comfortable support.

[0036] Further, as shown in Figure 3 , 4, 7, the back support assembly 3 can further rotate relative to the waist support assembly 2, the back support assembly 3 comprises a linkage 31, a back frame 32, a moving frame 33 and a backrest frame 34, both ends of the linkage 31 are respectively rotatably connected with the rotating frame 23 and the back rotating support 5, the linkage 31 is further rotatably connected with the moving frame 33 at the rotating connection point of the linkage 31 and the rotating frame 23, the linkage 31 is further rotatably connected with the back frame 32 at the rotating connection point of the linkage 31 and the back rotating support 5, the backrest frame 34 is fixedly connected with the moving frame 33, and the backrest frame 34 is used for fitting the human back; the moving frame 33 is further provided with a sliding rotating part 8, the back frame 32 is provided with a sliding groove 9, and the sliding rotating part 8 is arranged in the sliding groove 9; the sliding rotating part 8 is rotatably connected with a gas rod 10 as a locking device, the other end of the gas rod 10 is rotatably connected with the back frame 32, when the gas rod 10 is locked, the back support assembly 3 remains as a whole and moves under the action of the back rotating support 5 and the waist support assembly 2, when the gas rod 10 is unlocked, the linkage 31, the back frame 32 and the moving frame 33 constitute a movable three-link mechanism, when the back of the user continues to give the backrest frame 34 a backward force, the three-link mechanism moves, the sliding connecting part slides downward in the sliding groove 9, the back frame 32 and the moving frame 33 are both rotated backward relative to the linkage 31, that is, the backrest frame 34 is rotated backward relative to the waist rest frame 22, so that the included angle between the two is increased again.

Claims

1. A lumbar and back linkage seat, characterized by: The backrest assembly is rotatably connected with the back rotating support and the waist support assembly at different positions.

2. The lumbar-thoracic linkage seat of claim 1, wherein: The waist support assembly is located above the back rotating support, and the rotation point of the waist support assembly and the armrest seat is located above the rotation point of the back rotating support and the armrest seat.

3. The lumbar-thoracic linkage seat of claim 1, wherein: The upper part of the waist support assembly is rotatably connected with the middle part of the backrest assembly, and the lower end of the backrest assembly is rotatably connected with the upper end of the back rotating support.

4. The lumbar-thoracic linkage seat of claim 1, wherein: The seat is slidably arranged on the chassis, and the seat is rotatably connected with the waist support assembly.

5. The lumbar and thoracic linkage seat of claim 4, wherein: The rotation point of the waist support assembly and the seat is located below the rotation point of the waist support assembly and the armrest seat.

6. The lumbar and thoracic linkage seat of claim 4, wherein: An arc-shaped guide groove is formed in the armrest seat beside the rotation point of the waist support assembly and the seat, and the waist support assembly and the seat are rotatably connected through a rotating shaft which is inserted into the guide groove.

7. The lumbar and thoracic linkage seat of claim 1, wherein: The waist support assembly comprises a waist connecting piece, a waist back frame and a rotating frame.

8. The lumbar and back linkage seat of claim 7, wherein: A damping gasket is arranged between the waist connecting piece and the rotating frame, and the waist connecting piece and the rotating frame abut against the damping gasket.

9. The lumbar and thoracic linkage seat of claim 1, wherein: The back rotating support is a U-shaped frame with a hollow structure.

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