Chair capable of adjusting rotation of waist rest

Abstract

The utility model discloses a chair capable of adjusting the rotation of a waist rest, which comprises a back frame main body, a waist rest, a waist rest functional component and a waist rest button are arranged in the back frame main body, and the waist rest button is pressed to control the rotation of the waist rest through the waist rest functional component. When a user presses the waist rest button forwards to a fixed position, the spring is squeezed and contracted, the positioning pin of the rotating shaft falls at the top end (0 degree) of the semicircle of the forward pawl structure of the static cam, and when the user loosens the waist rest button, the rotating cam and the rotating shaft can rotate under the action of the automatic reset function of the spring. A positioning pin of the rotating shaft falls at the semicircular bottom (90 degrees) of a reverse pawl structure of the rotating cam, a square groove is formed in the middle of the rotating part and connected with the rotating shaft through the positioning pin, the rotating shaft drives the rotating part to rotate by degrees at the same time, and therefore the rotating part synchronously drives the waist rest to achieve the rotating function. The waist rest rotates, and the rotation of the waist rest can be adjusted according to the needs of a user.

Description

Technical Field

[0001] This utility model belongs to the field of chair technology, specifically relating to a chair with adjustable lumbar support that can rotate. Background Technology

[0002] Office chairs with lumbar support are pieces of office furniture specifically designed to provide lumbar support. These chairs typically come equipped with lumbar supports, a design that helps reduce lower back pressure and prevent back pain caused by prolonged sitting. Proper lumbar support helps maintain the natural curve of the spine and prevents spinal problems caused by poor posture. However, the lumbar supports in current office chairs are not adjustable and cannot dynamically adjust to changes in the user's posture. This means that users may not receive continuous lumbar support when changing positions, resulting in a lack of flexibility. Utility Model Content

[0003] This addresses the problem of existing chairs lacking flexibility due to their non-adjustable and non-rotating lumbar support.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an adjustable lumbar support chair, comprising a back frame body, wherein the back frame body is provided with a lumbar support, a lumbar support functional component and a lumbar support button, wherein the lumbar support functional component is provided on one side and the lumbar support button is provided on the other side.

[0005] Furthermore, the lumbar support functional component includes a rotating member, a stationary cam, a rotating cam, and a rotating shaft. The rotating member forms a square groove through a pair of positioning plates. The end of the rotating shaft is provided with a positioning pin. The positioning plates of the rotating member pass through the stationary cam and the rotating cam and are inserted into the rotating shaft. The square groove is sleeved on the outside of the positioning pin. The other side of the rotating shaft is provided with a spring positioning member. A spring is sleeved on the outside of the rotating shaft. One side of the spring abuts against the spring positioning member and the other side abuts against the rotating cam. The surfaces of the stationary cam and the rotating cam are both provided with a pawl structure.

[0006] Furthermore, the lumbar support includes a lumbar support PU pad, an inner lumbar support panel, and an outer lumbar support cover. The inner lumbar support panel has an outer lumbar support cover on one side and a lumbar support PU pad on the other side. The outer lumbar support cover is connected to the screw hole in the rotating part by connecting screws.

[0007] Furthermore, a locating ring is fitted around the outer periphery of the rotating component, which is connected to the stationary cam. A connecting structure is provided along the edge of the rotating component, and the connecting structure is located between the locating ring and the stationary cam.

[0008] Furthermore, the outer diameter of the spring positioning component is larger than the outer diameter of the rotating shaft, and the spring positioning component is connected to the rotating shaft by screws.

[0009] Furthermore, a lumbar support button is fitted on the outer side of the spring positioning component, and a hollow mounting part is provided in the back frame body. The lumbar support button is located in the mounting part of the back frame body. A protruding locking structure is provided on the outer periphery of the lumbar support button, and a locking edge is provided on the inner wall of the opening on one side of the mounting part. The locking structure and the locking edge limit the movement.

[0010] Furthermore, the stationary cam is connected to the edge of another opening in the mounting section by screws.

[0011] Furthermore, the back frame body has a back mesh fabric on the surface of the lumbar support PU pad.

[0012] Furthermore, a headrest is provided on the top of the main body of the back frame.

[0013] This utility model has the following beneficial effects: When the user presses the lumbar support button forward to a fixed position, the spring is compressed and contracted, and the positioning pin of the rotating shaft falls on the top of the semi-circular part of the forward pawl structure of the stationary cam (0 degrees). When the user releases the lumbar support button, under the action of the spring's automatic reset function, the positioning pin of the rotating shaft falls on the bottom of the semi-circular part of the reverse pawl structure of the rotating cam (90 degrees). The rotating part has a square groove in the middle, which is connected to the rotating shaft through the positioning pin. The rotating shaft simultaneously drives the rotating part to rotate by a certain degree. Therefore, the rotating part synchronously drives the lumbar support to achieve the rotation function. In summary, every time the user presses the lumbar support button, the lumbar support rotates by a certain degree, and the rotation of the lumbar support can be adjusted according to the user's needs. Attached Figure Description

[0014] Figure 1 This is the front view of the present invention;

[0015] Figure 2 This is an exploded view of the present invention;

[0016] Figure 3 This is a front view of the lumbar support functional component of this utility model;

[0017] Figure 4 This is an exploded view of the lumbar support functional component of this utility model;

[0018] Figure 5 This is a cross-sectional view of the lumbar support component of this utility model installed in the back frame body.

[0019] Figure 6 This is a schematic diagram of the locating pin in the pawl structure of the rotating cam of this utility model.

[0020] Figure 7 This is a schematic diagram of the stationary cam structure of this utility model;

[0021] Reference numerals: Back frame body 100; Lumbar support 110; Lumbar support functional component 120; Lumbar support button 130; Rotating component 121; Stationary cam 122; Rotating cam 123; Rotating shaft 124; Positioning plate 125; Square groove 126; Positioning pin 127; Spring positioning component 128; Spring 129; Pawl structure 101; Lumbar support PU pad 111; Lumbar support inner plate 112; Lumbar support outer cover 113; Rotating component positioning ring 102; Connecting structure 103; Headrest 12. Detailed Implementation

[0022] like Figures 1 to 7 As shown, an adjustable lumbar support chair includes a back frame body 100, in which a lumbar support 110, a lumbar support function component 120, and a lumbar support button 130 are provided. The lumbar support function component 120 has the lumbar support 110 on one side and the lumbar support button 130 on the other side. Pressing the lumbar support button 130 controls the rotation of the lumbar support 110 through the lumbar support function component 120.

[0023] The lumbar support functional component 120 includes a rotating member 121, a stationary cam 122, a rotating cam 123, and a rotating shaft 124. The rotating member 121 forms a square groove 126 through a pair of positioning plates 125. The rotating shaft 124 is provided with a positioning pin 127 at its end. The positioning plate 125 of the rotating member 121 passes through the stationary cam 122 and the rotating cam 123 and is inserted into the rotating shaft 124. The square groove 126 is fitted around the outside of the positioning pin 127. The rotating shaft 124 is also provided with a spring positioning member 128. A spring 129 is fitted around the outside of the rotating shaft 124. One side of the spring 129 abuts against the spring positioning member 128, and the other side abuts against the rotating cam 123. The surfaces of the stationary cam 122 and the rotating cam 123 are both provided with a pawl structure 101. The positioning pin 127 is pushed up and down on the surface of the pawl structure 101 by the elastic force of the lumbar support button 130 and the spring 129.

[0024] In practical implementation, when the user presses the lumbar support button 130 forward to a fixed position, the spring 129 is compressed and contracted, and the positioning pin 127 of the rotating shaft 124 falls on the semi-circular top (0 degrees) of the forward pawl structure 101 of the stationary cam 122. When the user releases the lumbar support button 130, under the automatic reset function of the spring 129, the positioning pin 127 of the rotating shaft 124 falls on the semi-circular bottom (90 degrees) of the reverse pawl structure 101 of the rotating cam 123. The rotating part 121 has a square groove 126 in the middle, which is connected to the rotating shaft 124 through the positioning pin 127. The rotating shaft 124 simultaneously drives the rotating part 121 to rotate 90 degrees. Therefore, the rotating part 121 synchronously drives the lumbar support 110 to achieve the rotation function. In summary, every time the user presses the lumbar support button 130, the lumbar support 110 rotates 90 degrees.

[0025] The lumbar support 110 includes a lumbar support PU pad 111, a lumbar support inner plate 112, and a lumbar support outer cover 113. The lumbar support inner plate 112 has a lumbar support outer cover 113 on one side and a lumbar support PU pad 111 on the other side. The lumbar support outer cover 113 is connected to the screw hole in the rotating component 121 through a connecting screw, so that the rotating component 121 can drive the lumbar support 110 to rotate.

[0026] The rotating component 121 is fitted with a rotating component positioning ring 102 on its outer periphery. The rotating component positioning ring 102 is connected to the stationary cam 122. The rotating component 121 is provided with a connecting structure 103 on its edge. The connecting structure 103 is located between the rotating component positioning ring 102 and the stationary cam 122. The rotating component positioning ring 102 can enable the rotating component 121 to rotate in the stationary cam 122 while preventing separation.

[0027] The outer diameter of the spring positioning member 128 is larger than the outer diameter of the rotating shaft 124. The spring positioning member 128 is connected to the rotating shaft 124 by screws. A lumbar support button 130 is sleeved on the outer side of the spring positioning member 128. The back frame body 100 has a hollow mounting part 10. The lumbar support button 130 is located in the mounting part 10 of the back frame body 100. The outer periphery of the lumbar support button 130 has a protruding engaging structure 131. The inner wall of the opening on one side of the mounting part 10 is provided with... There is a locking edge 11, and the locking structure 131 is limited by the locking edge 11. When the lumbar support button 130 is stopped from being pressed, the spring 129 pushes the lumbar support button 130 to move outward. The locking structure 131 and the locking edge 11 engage to prevent the lumbar support button 130 from disengaging from the back frame body 100. The stationary cam 122 is connected to the edge of another opening of the mounting part 10 by screws, so that the lumbar support functional component 120 is installed between the back frame body 100 and the back frame body 100.

[0028] The backrest body 100 has a back mesh fabric on the surface of the lumbar support PU pad 111. The back mesh fabric is usually made of a special mesh fabric, whose structure can effectively promote air circulation and reduce the accumulation of sweat and moisture. This design is especially important for people who sit in office chairs for long periods of time, as it can reduce the temperature of the back and the seat contact surface, reduce discomfort, and improve comfort.

[0029] The main body 100 of the back frame has a headrest 12 at the top. The headrest 12 is mainly designed to support the head and neck, maintain the natural curvature of the cervical spine, and reduce pressure on the neck and shoulders. This is especially important for people who sit in office chairs for long periods of time, as it can help relieve neck fatigue caused by prolonged sitting.

Claims

1. A chair with an adjustable lumbar support that can rotate, characterized in that, The back frame includes a main body (100), which includes a lumbar support (110), a lumbar support functional component (120), and a lumbar support button (130). The lumbar support functional component (120) has the lumbar support (110) on one side and the lumbar support button (130) on the other side. The lumbar support functional component (120) includes a rotating member (121), a stationary cam (122), a rotating cam (123), and a rotating shaft (124). The rotating member (121) forms a square groove (126) through a pair of positioning plates (125). The end of the rotating shaft (124) is provided with a positioning pin (126). 7) The positioning plate (125) of the rotating component (121) passes through the stationary cam (122) and the rotating cam (123) and is inserted into the rotating shaft (124). The square groove (126) is sleeved on the outside of the positioning pin (127). The rotating shaft (124) is provided with another spring positioning component (128). The rotating shaft (124) is sleeved with a spring (129) on the outside. One side of the spring (129) abuts against the spring positioning component (128) and the other side abuts against the rotating cam (123). The surfaces of the stationary cam (122) and the rotating cam (123) are both provided with a pawl structure (101).

2. The adjustable lumbar support chair according to claim 1, characterized in that, The lumbar support (110) includes a lumbar support PU pad (111), an inner lumbar support plate (112), and an outer lumbar support cover (113). The inner lumbar support plate (112) has an outer lumbar support cover (113) on one side and a lumbar support PU pad (111) on the other side. The outer lumbar support cover (113) is connected to the screw hole in the rotating part (121) by connecting screws.

3. The adjustable lumbar support chair according to claim 2, characterized in that, The rotating component (121) is fitted with a rotating component positioning ring (102) on its outer periphery. The rotating component positioning ring (102) is connected to the stationary cam (122). The rotating component (121) is provided with a connecting structure (103) on its edge. The connecting structure (103) is located between the rotating component positioning ring (102) and the stationary cam (122).

4. The adjustable lumbar support chair according to claim 1, characterized in that, The outer diameter of the spring positioning member (128) is larger than the outer diameter of the rotating shaft (124), and the spring positioning member (128) is connected to the rotating shaft (124) by screws.

5. The adjustable lumbar support chair according to claim 1, characterized in that, The spring positioning component (128) is fitted with a waist support button (130) on its outer side. The back frame body (100) is provided with a hollow structure mounting part (10). The waist support button (130) is located in the mounting part (10) of the back frame body (100). The waist support button (130) is provided with a protruding locking structure (131) on its outer periphery. The inner wall of the opening on one side of the mounting part (10) is provided with a locking edge (11). The locking structure (131) and the locking edge (11) limit the movement.

6. The adjustable lumbar support chair according to claim 5, characterized in that, The stationary cam (122) is connected to the edge of another opening of the mounting part (10) by screws.

7. The adjustable lumbar support chair according to claim 2, characterized in that, The back frame body (100) has a back mesh fabric on the surface of the lumbar support PU pad (111).

8. The adjustable lumbar support chair according to claim 7, characterized in that, The back frame body (100) is equipped with a headrest (12) on top.

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