Chair frame and massage chair comprising same

Abstract

The utility model relates to a chair frame and a massage chair comprising the chair frame, which are beneficial for realizing treatment on the back and the hip of a treated person with a simple structure while realizing zero leaning against a wall and lying flat. The chair frame of the utility model comprises a base; the seating part can be arranged on the base in a sliding manner; the backrest part is arranged on the base in a sliding manner, is rotatably connected with the seating part, and is switched from a standing state to a lying state along with forward movement of the seating part, the backrest part is provided with a movement track, and the movement track extends along the length direction of the backrest part; and the lower end of the backrest part is closer to the lower part than the vertical projection of the rotary connecting part of the backrest part and the seating part on the movement track.

Description

Technical Field

[0001] This utility model relates to a chair frame and a massage chair including the chair frame. Background Technology

[0002] Patent document 1 discloses a massage chair comprising: a base frame; a seat frame slidably disposed on the base frame; and a backrest frame slidably disposed on the base frame and hinged to the seat frame, which switches from an upright state to a reclining state as the seat frame moves forward. By employing the above structure, the massage chair can simultaneously achieve both zero-wall-adhesion and reclining functions.

[0003] Patent Document 1: CN211933355U

[0004] In the massage chairs mentioned above, if it is desired to massage the back and buttocks of the person being treated, the treatment mechanism can be installed on the back frame and seat frame respectively, but this can easily lead to the complexity of the overall structure. Utility Model Content

[0005] This invention was made in view of the above-mentioned problems, and its purpose is to provide a chair frame and a massage chair including the chair frame, which can achieve zero wall support and flat lying down, while helping to achieve treatment of the back and buttocks of the patient with a simple structure.

[0006] To achieve the above objectives, this utility model provides a chair frame, comprising: a base; a seat portion slidably disposed on the base; and a backrest slidably disposed on the base and hinged to the seat portion, and switching from an upright state to a reclining state as the seat portion moves forward. The backrest has a movement track extending along the length of the backrest, and its lower end is lower than the vertical projection of the rotatable connection between the backrest and the seat portion on the movement track.

[0007] Here, "the length direction of the backrest" roughly corresponds to the vertical direction when the backrest is upright, and roughly corresponds to the front-back direction when the backrest is reclined. Furthermore, "the vertical projection of the rotating connection part onto the movement track" refers to the vertical projection of the portion of the rotating connection part near the lower end of the movement track.

[0008] According to the chair frame of this utility model, whether the backrest is in an upright position or a reclining position, the treatment mechanism that moves along the mechanism track can be used to treat the back of the person being treated in the seat. On the other hand, when the backrest is in a reclining position, by moving the treatment mechanism to the front of the mechanism track, the treatment mechanism can also be used to treat the buttocks of the person being treated in the seat.

[0009] Furthermore, in the chair frame of this utility model, the distance from the upper end of the rotating connection part to the core track may be greater than the distance from the lower end of the rotating connection part to the core track.

[0010] Furthermore, the chair frame of this utility model may also include a drive unit, which drives the seat portion, thereby causing the backrest to move in the front-back direction during the transition between the reclining state and the standing state.

[0011] Furthermore, in the chair frame of this utility model, in the reclining state, the lower end of the mechanism track may be located near the seat surface of the seat portion.

[0012] According to the chair frame of this utility model, when the chair is in a reclining state, it is easier for the treatment mechanism located at the front of the mechanism track to come into contact with the thighs and buttocks of the person being treated, so as to perform massage and other treatments on the thighs and buttocks.

[0013] Furthermore, in the chair frame of this utility model, the seating portion can move linearly in the front-to-back direction relative to the base.

[0014] Furthermore, in the chair frame of this utility model, the rotating connecting part can move linearly relative to the base in the front-back direction.

[0015] According to the chair frame of this utility model, the drive unit only needs to drive the seat part to move relative to the base in a straight line. Therefore, the control of the drive unit can be simplified, and the movable distance of the seat part can be accurately determined, thereby accurately determining the placement position of the chair under the zero wall-adhesion function, which will not cause space waste or interference with the wall.

[0016] Furthermore, in the reclining state, the lower end of the movement track is located near the seat surface of the seat portion.

[0017] According to the chair frame of this utility model, when the backrest is in a reclining position, it is easier for the treatment mechanism located at the front end of the mechanism track to come into contact with the thighs and buttocks of the person being treated while seated in the seat. Furthermore, the backrest and the seat can form a support surface suitable for the physiological curve of the human body.

[0018] Furthermore, in the chair frame of this utility model, guide members can be symmetrically arranged on the left and right sides of the base, first moving members guided by the guide members can be symmetrically arranged on the left and right sides of the backrest, and second moving members guided by the guide members can be symmetrically arranged on the left and right sides of the seating portion. In this case, it is preferable that the first moving members and the second moving members form a triangular relationship.

[0019] The chair frame according to this invention helps to stabilize the travel, thereby ensuring the stability of the backrest and seat sliding back and forth.

[0020] Furthermore, in the chair frame of this utility model, the guide may include: a first track, which is a straight line extending from the upper rear to the lower front and guides the first moving member; and a second track, which is a straight line extending in the front-back direction and guides the second moving member, and at least a portion of it is forward of the first track.

[0021] Furthermore, in the chair frame of this utility model, the driving part may include a push rod, one end of which is connected to the base and the other end is connected to the seating part.

[0022] Furthermore, the chair frame of this utility model may also include a treatment mechanism that can move along the mechanism track. In the upright state, when the treatment mechanism moves to a position lower than the rotating connection part, the treatment mechanism is located below the seating surface of the seating part.

[0023] According to the present invention, when the backrest is in the upright position, by stopping the massage mechanism in the lower half of the mechanism track, the mechanism can be hidden under the seat, achieving the sitting effect of an ordinary chair and reducing the feeling of foreign objects.

[0024] In addition, in order to achieve the above objectives, this utility model provides a massage chair, which includes the chair frame of any of the above-mentioned components. Attached Figure Description

[0025] Figure 1 This is a perspective view schematically illustrating an embodiment of the chair frame of the present invention, wherein the footrest is omitted.

[0026] Figure 2 This is an exploded view schematically illustrating an embodiment of the chair frame of the present invention, wherein the footrest is omitted.

[0027] Figure 3 This is a perspective view schematically showing the base and seating portion of the chair frame according to an embodiment of the present invention.

[0028] Figure 4 This is a perspective view schematically showing the seating portion and backrest of the chair frame according to an embodiment of the present invention.

[0029] Figure 5 This is a schematic side view of the chair frame according to an embodiment of the present invention, showing that the backrest is in an upright position.

[0030] Figure 6This is a schematic view of the chair frame according to an embodiment of the present invention, showing that the backrest is in an upright position.

[0031] Figure 7 This is a schematic side view of the chair frame according to an embodiment of the present invention, showing the backrest in a reclining position.

[0032] Figure 8 This is a schematic view of the chair frame according to an embodiment of the present invention, showing that the backrest is in a reclining position.

[0033] (Symbol Explanation)

[0034] 1 Chair frame

[0035] 10 bases

[0036] 11. Base bottom

[0037] 111 First horizontal bar

[0038] 112 Second crossbar

[0039] 12. Guide components

[0040] 121 First Track

[0041] 122 Second Track

[0042] 13 Base connection part

[0043] 131 First vertical rod

[0044] 132 Second vertical rod

[0045] 133 Third vertical rod

[0046] 134 Third horizontal bar

[0047] 20 Seating Section

[0048] 21 Guided Department

[0049] 211 Supporting crossbar

[0050] 212 Second moving part

[0051] 22 Seating at the top

[0052] 221 Top crossbar

[0053] 222 Top Link

[0054] 223 seat frame

[0055] 224 linkage

[0056] 23 First Seating Connection Section

[0057] 231 First connecting vertical rod

[0058] 232 Second connecting vertical rod

[0059] 24 Second Seating Connection Part

[0060] 241 U-shaped rod

[0061] 30 Backrest

[0062] 31. Movement Track

[0063] 311 Long strip component

[0064] 32 Connecting rod

[0065] 33 First moving part

[0066] 40. Mobile Phone Department

[0067] 50 Drive Unit

[0068] 51 Putter

[0069] 52 Putter

[0070] J1 Hinge

[0071] J2 hinge Detailed Implementation

[0072] Below, in conjunction with Figures 1 to 8 Taking a massage chair as an example, the chair frame of this utility model will be described. However, this chair frame is not limited to massage chairs and other massage devices, but can also be used in functional chairs and other devices with therapeutic functions other than massage.

[0073] For ease of explanation, the orientation of the massage chair's structure is described using the perspective of the person receiving the massage while seated. For example, the front side (front view) of the person receiving the massage is referred to as "front" or "forefront," the back side (back view) as "back" or "rear," the upper side (head side) as "upper" or "above," the lower side (foot side) as "lower" or "below," the right side as "right" or "right side," and the left side as "left" or "left side."

[0074] Example

[0075] (The overall structure of the chair frame)

[0076] like Figure 1 and Figure 2As shown, the chair frame 1 includes: a base 10; a seat portion 20 slidably disposed on the base 10; and a backrest 30 slidably disposed on the base 10, rotatably connected to the seat portion 20 (hinged in the illustrated example), and moving from an upright state (see reference) as the seat portion 20 moves forward. Figure 5 , Figure 6 (Refer to) lying down position (see) Figure 7 , Figure 8 Switching. The upright position refers to the angle formed by the seat 20 and the backrest 30 being suitable for keeping the patient in a near-sitting position. The reclining position refers to the angle formed by the seat 20 and the backrest 30 being suitable for keeping the patient in a near-reclining position.

[0077] The backrest 30 has: a mechanism track 31 extending along the length of the backrest 30; and a treatment mechanism (not shown) that moves along the mechanism track 31. The explanation is based on the backrest 30 in an upright position. The mechanism track 31 extends from the upper end of the backrest 30 to the lower end, and the lower end is further below the vertical projection of the hinge portion J1, which serves as the rotating connection between the backrest 30 and the seat portion 20, on the mechanism track 31 (i.e., when the hinge portion J1 is located on the side of the mechanism track 31 in the middle, the mechanism track 31 continues to extend downward from the hinge portion J1 of the backrest 30 and the seat portion 20; when the hinge portion J1 is on the front side of the mechanism track (in the upright position, from the perspective of the person receiving treatment), the mechanism track 31 continues to extend downward from the vertical projection of the hinge portion J1 of the backrest 30 and the seat portion 20 on the mechanism track 31). The distance from the upper end of the hinge J1 to the upper end of the mechanism track 31 is greater than the distance from the lower end of the mechanism track 31 to the lower end, i.e., the first end. In the reclining state, the aforementioned first end of the mechanism track 31 is located near the seating surface of the seat portion 20 (i.e., the surface that contacts the thighs and buttocks of the person being treated while seated in the massage chair) (preferably flush with the seating surface, but may also be higher or lower than the seating surface).

[0078] Here, as Figure 7 and Figure 8 As shown, the chair frame 1 also includes a leg joint 40. The leg joint 40 is rotatably connected to the seat portion 20 (in the illustrated example, it is hinged). The hinge portion J2, which serves as the rotatable connection between the leg joint 40 and the seat portion 20 (see reference...) Figure 2 It is located at the front end of the seating surface of the seating section 20.

[0079] In addition, such as Figure 1 and Figure 2 As shown, the chair frame 1 also includes a drive unit 50. The drive unit 50 drives the seat 20, thereby causing the backrest 30 to translate and rotate between a reclining state and an upright state. The drive unit 50 also drives the footrest 40 to rotate.

[0080] (Structure of the base)

[0081] like Figure 1 and Figure 2 As shown, the base 10 is a support frame that supports the entire functional components, including the seating part 20, the backrest 30, and the footrest 40.

[0082] Here, as Figure 2 As shown, the base 10 includes a base bottom 11, a guide 12, and a base connecting portion 13. The bottom surface of the base bottom 11 is in contact with a supporting surface such as the ground, and the surface on which the base bottom 11 is located can also be regarded as the bottom surface. The guide 12 is located above the base bottom 11 and is connected to the base bottom 11 via the base connecting portion 13.

[0083] In addition, such as Figure 2 and Figure 3 As shown, the base bottom 11 forms a supporting base for the support frame. Specifically, the base bottom 11 includes: a pair of first crossbars 111 extending in the front-rear direction and spaced apart in the left-right direction; and a plurality of second crossbars 112 extending in the left-right direction, arranged at intervals in the front-rear direction, and connecting the pair of first crossbars 111 to each other.

[0084] In addition, such as Figure 2 and Figure 3 As shown, guide members 12 are symmetrically arranged on the left and right sides of the base 10. Specifically, the guide members 12 include: a first track 121, which is a straight line extending from the rear upper direction to the front lower direction and guides the first moving member 33; and a second track 122, which is a straight line extending in the front-rear direction and guides the second moving member 212, and at least a portion of it is forward of the first track 121. The first track 121 is higher than the second track 122 and is connected to the second track 122 at the midpoint of its front-rear direction.

[0085] In addition, such as Figure 2 and Figure 3As shown, the base connecting portion 13 is symmetrically arranged on the left and right sides of the base 10, and connects the guide 12 to the first crossbar 111 on the corresponding side. Specifically, the base connecting portion 13 includes a pair of first vertical bars 131, a pair of second vertical bars 132, a pair of third vertical bars 133, and a pair of third crossbars 134. The pair of first vertical bars 131 are spaced apart in the left-right direction, and connect the vicinity of the front end of the guide 12 (in the illustrated example, the vicinity of the front end of the second track 122) to the vicinity of the front end of the first crossbar 111. The pair of second vertical bars 132 extend in the vertical direction, are spaced apart in the left-right direction, and connect the midway point of the guide 12 (in the illustrated example, the midway point of the second track 122) to the midway point of the first crossbar 111 in the length direction. A pair of third vertical rods 133 extend vertically and are spaced apart horizontally, connecting the rear end of the guide 12 (in the illustrated example, the rear end of the first track 121 and the rear end of the second track 122) to the rearward portion of the first horizontal rod 111 in the longitudinal direction. A third horizontal rod 134 connects the midway points of the first vertical rod 131 and the second vertical rod 132 in the longitudinal direction. The length of the first vertical rod 131 is approximately equal to the length of the second vertical rod 132 (of course, this is not a limitation; the length of the first vertical rod 131 can be greater than or less than the length of the second vertical rod 132 as needed).

[0086] (Structure of the seating area)

[0087] like Figures 1 to 3 As shown, the seat 20 is a support frame for supporting the buttocks and thighs of the person receiving treatment.

[0088] Here, as Figure 2 As shown, the hinge J1 between the backrest 30 and the seating portion 20 is located on the side of the backrest 30. Specifically, the hinge J1 can be provided on the side of the frame of the backrest 30; or it can be provided at a position where it extends forward from the side of the frame of the backrest 30 (in the upright state) and protrudes further forward than the frame of the backrest 30. Figure 2 and Figure 3 As shown, second moving members 212, guided by the guide member 12, are symmetrically arranged on the left and right sides of the seating portion 20. The seating portion 20 is supported on the base 10 via the second moving members 212 and can move linearly (e.g., approximately horizontally) relative to the base 10 in the front-back direction. Specifically, the seating portion 20 includes a guided portion 21, a seating top 22, a first seating connecting portion 23, and a second seating connecting portion 24. The seating top 22 is located above the guided portion 21. The guided portion 21 has the second moving member 212. The first seating connecting portion 23 connects the guided portion 21 and the seating top 22 together. The second seating connecting portion 24 protrudes downward from the guided portion 21. More specifically, as... Figure 2 and Figure 3 As shown, the guided part 21 includes a pair of support crossbars 211 and a second moving member 212. The pair of support crossbars 211 extend in the front-back direction and are spaced apart in the left-right direction. The second moving member 212 is respectively provided on the outer side of the support crossbars 211 in the left-right direction. Two second moving members 212 are provided on the left and right sides respectively, forming a triangular relationship with the first moving member 33, thereby stabilizing the stroke and ensuring the stability of the backrest and seat sliding back and forth. The second moving member 212 is, for example, made of rollers. The seat top 22 includes a pair of top crossbars 221, a top connecting rod 222, a seat frame 223, and a connecting rod 224. The pair of top crossbars 221 extend in the front-back direction and are spaced apart in the left-right direction. A hinge part J2 is provided on the front end side of the pair of top crossbars 221 for hinged to the footrest part 40, and a hinge part J1 is provided on the rear end side of the pair of top crossbars 221 for hinged to the backrest 30. Hinges J1 and J2 move linearly relative to the base 10 in the front-rear direction. A top connecting rod 222 extends in the left-right direction and connects a pair of top crossbars 221 together. A seat frame 223 extends substantially in the horizontal plane and has an opening extending vertically (e.g., to expose the treatment part of the treatment mechanism). The seat frame 223 is located between the pair of top crossbars 221 in the left-right direction and is fixed to the top of the top connecting rod 222. The upper surface of the seat frame 223 forms a seat surface that passes through the hinge J1. The first seat connection 23 includes a pair of first connecting vertical rods 231 and a pair of second connecting vertical rods 232. The first connecting vertical rods 231 connect the top crossbars 221 midway along their length to near the front end of the support crossbar 211. The pair of second connecting vertical rods 232 connect the rear ends of the top crossbars 221 to near the rear ends of the support crossbars 211. The upper end of the connecting rod 224 is hinged to the top connecting rod 222. The second seat connection 24 includes two U-shaped rods 241 spaced apart in the front-back direction. Each U-shaped rod 241 includes: a pair of extensions extending downward from the middle of the length direction of a pair of support crossbars 211; and a connection portion connecting the lower ends of the pair of extensions.

[0089] (Backrest structure)

[0090] like Figure 1 , Figure 2 and Figure 4 As shown, the backrest 30 is a support frame used to support the back of the person receiving treatment.

[0091] Here, as Figure 1 , Figure 2 , Figure 7 and Figure 8As shown, first moving parts 33, guided by guide members 12, are symmetrically arranged on the left and right sides of the backrest 30. Specifically, the backrest 30 is, for example, rectangular in shape, and has a mechanism track 31, multiple connecting rods 32, and first moving parts 33. For example, in the reclining position, the mechanism track 31 has a downwardly convex curved shape with its front end pointing upwards, thereby making it easier for the treatment mechanism located at the front end of the mechanism track 31 to contact the thighs and buttocks of the patient seated in the seating part 20. The mechanism track 31 extends along approximately the entire length of the backrest 30 and is composed of a pair of elongated members 311 spaced apart in the left-right direction. The shape of the elongated members 311 remains unchanged when the backrest 30 rotates between the reclining and upright positions. The treatment mechanism (not shown) is positioned between the pair of elongated members 311 in the left-right direction. Multiple connecting rods 32 connect the pair of elongated members 311 respectively. The first moving member 33 is disposed on the outer side of the backrest frame (in the illustrated example, it is disposed on the outer side of a pair of elongated members 311 in the left and right directions respectively). The first moving member 33 is, for example, composed of rollers.

[0092] Furthermore, in the upright position, when the treatment mechanism moves to a position lower than the hinge J1, such as the lower end of the mechanism track 31, the treatment mechanism is located below the seating surface of the seat portion 20. Therefore, when stopping operation, the treatment mechanism can be positioned below the seating surface of the seat portion 20. On the other hand, during operation, the treatment mechanism can move along the mechanism track 31 to the waist and above of the patient seated in the seat portion 20.

[0093] (Structure of the drive unit)

[0094] As described above, the drive unit 50 drives the seat unit 20 and also drives the foot unit 40.

[0095] Here, as Figures 1 to 3 As shown, the drive unit 50 includes a push rod 51. One end of the push rod 51 is connected to the base 10, and the other end is connected to the seat portion 20. Specifically, the push rod 51 has a first portion and a second portion that can slide relative to the first portion. One end of the first portion is hinged to a second crossbar 112 at the front of the base 10, and one end of the second portion is hinged to a rear U-shaped rod 241. The push rod 51 is, for example, a flat push rod.

[0096] In addition, such as Figures 1 to 3 As shown, the drive unit 50 includes a push rod 52. One end of the push rod 52 is connected to the front U-shaped rod 241, and the other end is connected to the connecting rod 224. Specifically, the push rod 52 has a first portion and a second portion that can extend and retract relative to the first portion. One end of the first portion is hinged to the front U-shaped rod 241, and one end of the second portion is hinged to the middle of the connecting rod 224.

[0097] (Switching movements with the backrest on)

[0098] As described above, the seat 20 is driven by the drive unit 50, which causes the backrest 30 to translate and rotate between the reclining state and the upright state.

[0099] Here, as Figure 5 and Figure 6 As shown, when the backrest 30 is in the upright position, as the drive unit 50 drives the seat portion 20 to move forward, the entire backrest 30 also moves forward. Simultaneously, the backrest 30 rotates around the hinge J1 and reclines (the upper end of the backrest 30 lowers, and the lower end rises). Specifically, as the second part of the push rod 51 moves forward relative to the first part, the seat portion 20, hinged to the second part of the push rod 51, is guided forward by the second track 122 via the second moving member 212 arranged in a front-to-back configuration. During the forward movement of the seat portion 20 along the second track 122, the entire backrest 30, connected to the seat portion 20 via the hinge J1, also moves forward. For example, when the second track 122 is configured as a straight line extending in the front-to-back direction, the entire backrest 30 will move along the extending direction of the second track 122. The backrest 30 is guided forward and downward by the first track 121, which is inclined relative to the second track 122, and rotates around the hinge J1. As the movement track 31 rotates around the hinge J1, the lower end of the movement track 31 gradually approaches the seat 20, and the backrest 30 gradually changes from an upright state to a reclining state.

[0100] On the other hand, such as Figure 7 and Figure 8 As shown, when the backrest 30 is in a reclined position, as the push rod 51 of the drive unit 50 drives the seat 20 to move rearward, the entire backrest 30 also moves rearward. Simultaneously, the backrest 30 rotates around the hinge J1 and stands upright (the upper end of the backrest 30 rises, and the lower end of the backrest 30 falls). Specifically, as the second part of the push rod 51 moves rearward relative to the first part, the seat 20, hinged to the second part of the push rod 51, is guided to move rearward by the second track 122 via the second moving member 212. During the rearward movement of the seat 20 along the second track 122, the entire backrest 30, connected to the seat 20 via the hinge J1, also moves rearward. Simultaneously, the backrest 30 is guided to move rearward and upward by the first track 121, which is inclined relative to the second track 122, via the first moving member 33, and rotates around the hinge J1 to stand upright.

[0101] According to the chair frame 1 of this embodiment, as the drive unit 50 drives the seat 20 to move forward, the backrest 30 also moves forward as a whole. Therefore, even when the backrest 30 is upright and close to the wall, when the backrest 30 is reclined due to the drive unit 50 driving the seat 20 to move forward, the rear end of the reclining backrest 30 can be prevented from contacting the wall. Thus, zero wall contact and reclining can be achieved simultaneously. In particular, when the seat 20 moves forward, its movement trajectory is a straight line forward. Compared with the existing case where the movement trajectory is curved upward, the displacement of the rear end of the reclining backrest 30 (i.e., the upper end when upright) can be accurately determined, thereby allowing for precise placement of the massage chair without interference with the wall.

[0102] Furthermore, according to the chair frame 1 of this embodiment, the backrest 30 has: a mechanism track 31 extending along the length of the backrest 30; and a treatment mechanism (not shown) that moves along the mechanism track 31. In the upright state, the mechanism track 31 continues downward from the hinge J1 between the backrest 30 and the seat portion 20, and the distance from the upper end of the hinge J1 to the lower end, i.e., the first end, of the mechanism track 31 is greater than the distance from the lower end, i.e., the first end, of the mechanism track 31. In the reclining state, the first end of the mechanism track 31 is located near the seat surface of the seat portion 20. Therefore, regardless of whether the backrest 30 is in an upright or reclining state, the back of the person being treated in the seat portion 20 can be treated using the treatment mechanism; on the other hand, when the backrest 30 is in a reclining state, by moving the treatment mechanism to the front of the mechanism track 31, the buttocks of the person being treated in the seat portion 20 can also be treated using the treatment mechanism.

[0103] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described embodiments. Within its scope, the present invention can freely combine the various parts of the embodiments, or appropriately modify or omit the various parts of the embodiments.

Claims

1. A chair frame comprising: Base; A seating portion slidably disposed on the base; and a backrest, characterized in that, The backrest is slidably mounted on the base and rotatably connected to the seating section. As the seating section moves forward, it switches from an upright position to a reclining position. The backrest has a movement track. The movement track extends along the length of the backrest, and its lower end is further below the vertical projection of the rotating connection between the backrest and the seat portion on the movement track.

2. The chair frame as described in claim 1, characterized in that, The distance from the upper end of the rotating connection part to the movement track is greater than the distance from the lower end of the movement track.

3. The chair frame as described in claim 1, characterized in that, It also includes the drive unit, The drive unit drives the seat unit, thereby causing the backrest to move in the front-back direction during the transition between the reclining state and the standing state.

4. The chair frame as described in claim 1 or 2, characterized in that, During the process of the backrest changing from the upright state to the reclining state, the movement track rotates around the rotating connection part, and the lower end of the movement track gradually approaches the seat part.

5. The chair frame as described in claim 1 or 2, characterized in that, In the reclining state, the lower end of the movement track is located near the seat surface of the seat portion.

6. The chair frame as described in claim 1 or 2, characterized in that, The rotating connection portion moves linearly relative to the base in the front-to-back direction.

7. The chair frame as described in claim 1 or 2, characterized in that, Guide elements are symmetrically arranged on the left and right sides of the base. First moving parts, guided by the guide members, are symmetrically arranged on the left and right sides of the backrest. Second moving parts, guided by the guide members, are symmetrically arranged on the left and right sides of the seating portion.

8. The chair frame as described in claim 7, characterized in that, The guide includes: A first track, which is a straight line extending from the upper rear to the lower front, guides the first moving member; and The second track, which is a straight line extending in the front-back direction, guides the second moving member and at least a portion of it is forward of the first track.

9. The chair frame as described in claim 1, characterized in that, It also includes a treatment mechanism capable of moving along the track of the mechanism. In the upright position, when the treatment mechanism moves to a position lower than the rotating connection, the treatment mechanism is located below the seat surface of the seat.

10. A massage chair, characterized by, The chair frame includes any one of claims 1 to 9.

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