Massage chair frame

Abstract

This invention relates to a massage chair frame, comprising a base frame, a seat cushion frame, a backrest frame, a leg support, and an electric push rod. The backrest frame is hinged to the rear of the seat cushion frame, forming an adjustable unit, and is sway-supported on the base frame by two front support rods and two rear support rods. Each side of the rear of the backrest frame has a track wheel, which rests on tracks on both sides of the base frame, providing rear support. One end of the electric push rod is hinged to the base frame, and the other end is hinged to any position on the front support rod, rear support rod, or backrest frame, driving continuous changes in sitting and reclining positions. In this invention, the seat cushion frame and backrest frame are separate and hinged together, each with its own degree of freedom, facilitating adjustment of the angle between them to meet comfortable sitting and reclining postures. It features a unique design, reasonable structure, prevents forward slippage in sitting position, and allows forward movement in reclining position.

Description

Technical fields:

[0001] This invention belongs to the field of massage chair technology, and specifically relates to a massage chair frame, particularly a solution that can be adjusted to a lying position. Background technology:

[0002] Massage chairs offer comprehensive relaxation and therapeutic benefits, and can also promote sleep. Their development has progressed from segmented structures for the seat and backrest to integrated L-shaped tracks. The former features separate massage mechanisms for the seat and backrest, resulting in higher costs; the latter requires only one massage mechanism that can continuously move between the seat and backrest. While it allows for continuous changes from sitting to reclining positions, the angle between the buttocks and backrest remains constant due to the L-shaped track, which is its biggest drawback. Currently, L-shaped track massage chairs, due to their limited posture, are not suitable for prolonged sleeping. Therefore, manufacturers are seeking solutions from traditional methods, such as:

[0003] CN201020286803.5 discloses a reclining leisure massage chair, including a backrest, a seat cushion, and a footrest. The backrest and footrest frames are hinged to the seat cushion frame, respectively. The backrest and footrest frames are connected by a linkage mechanism. When the backrest frame flips backward, the footrest frame rises accordingly. A sliding plate is also provided on the footrest frame, which is connected to a swing rod mechanism and can slide back and forth within a slide rail. Foot pads are connected to the sliding plate. This structure allows the footrest to rise simultaneously when the backrest flips backward, enabling the chair to unfold horizontally and allowing the user to recline.

[0004] CN202223483744.2 discloses a massage chair that allows for reclining massage, relating to the field of massage chairs. Massage mechanisms are respectively installed on the base assembly and the backrest assembly, and the massage mechanisms can slide along the backrest assembly or the base assembly; the backrest assembly is hinged to the base assembly, and the backrest assembly can rotate around the base assembly so that the backrest assembly and the base assembly are on the same horizontal plane. This device provides users with a massage chair that allows for reclining massage. Users can receive massages in either a sitting or reclining position. When the massage chair is not in use, it can also be used as a bed by adding a soft cushion, thus achieving multi-functionality and effectively improving utilization.

[0005] None of the above-mentioned seat cushions can change shape with sitting or lying down. Although lying down provides a better experience, sitting comfort is affected. Therefore, providing a more reasonable technical solution is the subject of this invention. Summary of the Invention:

[0006] The purpose of this invention is to design a massage chair frame that uses an electric push rod to continuously change the angle between the seat cushion frame and the backrest frame, thus accommodating sitting and reclining postures.

[0007] The technical solution of this invention is implemented as follows: A massage chair frame includes a base frame, a seat cushion frame, a backrest frame, a leg support, and an electric push rod; the backrest frame is located at the rear of the seat cushion frame, and the seat cushion frame and the backrest frame can change their angle and move back and forth relative to the base frame under the drive of the electric push rod; the leg support is suspended at the front end of the seat cushion frame and swings under the drive of a linkage mechanism or the electric push rod; the backrest frame is hinged to the rear of the seat cushion frame, forming an adjustable whole, and is sway-supported on the base frame by two front support rods and two rear support rods; a track wheel is provided on each side of the rear of the backrest frame, and the track wheel rests on the track on both sides of the base frame to form rear support; one end of the electric push rod is hinged to the base frame, and the other end is hinged to any position of the front support rod, the rear support rod, or the backrest frame, driving continuous changes in sitting and reclining position.

[0008] As a preferred embodiment, the upper ends of the two front support rods are hinged to the front sides of the seat cushion frame, the middle parts are hinged to the front upright of the base frame, and the lower ends are connected by a front crossbeam; the two rear support rods are hinged at both ends to the base frame and the backrest frame or seat cushion frame, and are connected by a rear crossbeam; the front or rear crossbeam provides a hinge position for one end of the electric push rod, and the linkage mechanism of the leg support is set between the front crossbeam and the front end of the seat cushion frame.

[0009] The linkage mechanism includes a swing rod, a long connecting rod, a pry bar, and a short connecting rod. The swing rod is hinged to the front end of the seat frame and has a roller at its lower end, which abuts against the back of the leg frame. One end of the long connecting rod is hinged to the swing rod, and the other end is hinged to the end of the pry bar, which is hinged to the front crossbeam. One end of the short connecting rod is hinged to the base frame, and the other end is hinged to the middle of the pry bar, providing a fulcrum for the pry bar's swing.

[0010] As a preferred embodiment, the two front support rods are hinged at both ends to the front sides of the base frame and the seat cushion frame, and the two rear support rods are hinged at both ends to the sides of the base frame and the seat cushion frame or backrest frame. The two front support rods are connected by a front crossbeam, and the two rear support rods are connected by a rear crossbeam. The front or rear crossbeam provides a hinge position for one end of the electric push rod, and the linkage mechanism of the leg frame is located between the rear crossbeam and the front end of the seat cushion frame.

[0011] The linkage mechanism includes a swing rod, a long connecting rod, a pry bar, and a short connecting rod. The swing rod is hinged to the front end of the seat frame and has a roller at its lower end, which abuts against the back of the leg frame. One end of the long connecting rod is hinged to the swing rod, and the other end is hinged to the end of the pry bar. The middle part of the pry bar is hinged to the rear crossbeam, and the other end is hinged to one end of the short connecting rod. The other end of the short connecting rod is hinged to the base frame, restraining one end of the pry bar so that it swings with the rear crossbeam.

[0012] The hinge point at the upper end of the rear support rod has any of the following structures: 1. It is directly hinged to the backrest frame and located below the hinge point between the backrest frame and the seat cushion frame; 2. The upper end of the rear support rod is hinged to the same hinge point between the backrest frame and the seat cushion frame. In the above two structures, during the forward movement of the backrest frame, the swing of the rear support rod is always within the range of an acute angle with the horizontal plane, and the track wheel is always behind the rear support rod.

[0013] Armrest supports are provided on both sides of the backrest frame; the armrest supports are any of the following structures: 1. A bent sheet metal part, welded to the downward extension of the backrest frame at the hinge position, and extending outward from the upper part to the outside of the seat cushion frame; 2. A metal tube, directly set above the hinge position of the backrest frame and the seat cushion frame or the rear support rod.

[0014] The front support rod and the rear support rod are tilted forward and backward relative to the vertical plane when the person is seated, and the rear support rod is tilted backward when the person is lying down. The rear support rod is nearly parallel to the vertical plane.

[0015] The base frame has rear columns on both sides at the rear. The rear columns are used to fix the track, which is a straight track or an arc track, and is fixed to the rear columns with the front lower than the back.

[0016] As a preferred embodiment, one end of the electric push rod is hinged to the connecting beam of the extension section of the backrest frame.

[0017] The present invention features a seat cushion frame and a backrest frame that are hinged together separately, each with its own degree of freedom, allowing for adjustment of the angle between the two to meet the comfort requirements of sitting and lying positions. One or two electric push rods are used to solve the problem of forward movement and sitting / lying transition, and in conjunction with a linkage mechanism, the leg support is adjusted synchronously. It features a unique design, reasonable structure, and prevents forward slippage when sitting and allows forward movement when lying down, thus satisfying the needs of relaxation and promoting sleep. Attached image description:

[0018] The invention will be further described below with reference to specific figures:

[0019] Figure 1 Diagram showing the sitting posture of a massage chair frame

[0020] Figure 2 Diagram of a massage chair frame in reclining position

[0021] Figure 3 A side view diagram of the massage chair frame in a seated position.

[0022] Figure 4 A side view diagram of a massage chair frame in a reclining position.

[0023] Figure 5 A breakdown diagram of the sitting posture for a massage chair frame.

[0024] Figure 6 Schematic diagram of the seating posture drive structure of a massage chair frame

[0025] Figure 7 Schematic diagram of the reclining drive structure of the massage chair frame

[0026] Figure 8 Schematic diagram of massage chair frame 2

[0027] Figure 9 A two-part exploded view of the massage chair frame

[0028] Figure 10 A side view diagram of a massage chair frame in two sitting positions.

[0029] Figure 11 Schematic diagram of the two reclining position drive structure of the massage chair frame

[0030] Figure 12 A side view diagram of a massage chair frame in three sitting positions.

[0031] Figure 13 Side view diagram of massage chair frame in three reclining positions

[0032] in

[0033] 1—Base frame; 11—Front column; 12—Rear column; 13—Railway; 14—Center column;

[0034] 2—Seat frame; 21—Front support rod; 211—Front crossbeam; 22—Rear support rod; 221—Rear crossbeam;

[0035] 3—Backrest frame; 31—Rail wheels; 32—Extension section; 33—Armrest support; 34—Travel track; 35—Frame;

[0036] 4—Legged scaffolding;

[0037] 5—Electric linear actuator;

[0038] 6—Linkage mechanism; 61—Swing rod; 611—Roller; 62—Long connecting rod; 63—Pry bar; 64—Short connecting rod;

[0039] A—Hinge point between backrest frame and seat cushion frame; B—Hinge point between rear support rod and backrest frame; Detailed implementation method:

[0040] Example 1:

[0041] Reference Figures 1 to 7 The massage chair frame includes a base frame 1, a seat cushion frame 2, a backrest frame 3, a leg support 4, an electric push rod 5, and a linkage mechanism 6 for driving the leg support.

[0042] The backrest frame 3 is hinged to the rear of the seat cushion frame 2, forming an adjustable unit, and is sway-supported on the base frame 1 by two front support rods 21 and two rear support rods 22. To improve the connection and rigidity of the two front support rods 21 and the two rear support rods 22, a front crossbeam 211 is provided between the two front support rods 21 and a rear crossbeam 221 is provided between the two rear support rods 22.

[0043] More specifically, in the seated position, the front support rod 21 is tilted forward relative to the vertical plane, and the rear support rod 22 is tilted backward. In the reclining position, the rear support rod 22 is nearly parallel to the vertical plane. As the chair transitions from a seated to a reclining position, the seat cushion 2 gradually moves forward and lowers in height. The backrest 3 is pulled forward by the seat cushion, shifting forward to a more relaxed position. This reduces the space occupied at the rear of the backrest, allowing the massage chair to be placed against a wall. Figure 3 , Figure 4 , Figure 6 and Figure 7 .

[0044] Since the backrest frame 3 and the seat cushion frame 2 are rotatably hinged, a track wheel 31 is installed on each side of the rear of the backrest frame 3. The track wheel 31 rests on the tracks 13 on both sides of the base frame, forming a rear support point. This makes the adjustment of the angle between the seat cushion frame 2 and the backrest frame 3 smoother and stabilizes the backrest frame 3 at a working angle. It also serves as the fulcrum for the backrest frame 3 to swing. Only through the cooperation of the track wheel 31 and the track 13 can the seat cushion frame 2 and the backrest frame 3 be stably supported and can be smoothly adjusted along the track. When changing from a sitting posture to a reclining posture, the backrest frame 3 is pulled forward, the rear support rod 22 gradually stands upright, and the track wheel 31 moves downward along the track 13, causing the backrest frame 3 to change to a flat position.

[0045] Furthermore, the base frame 1 has a front column 11 and a rear column 12 on its front and rear sides, respectively. The front column 11 is used to hinge the front support rod 21, and the rear column 12 is used to fix the track 13. The track 13 is a straight or curved track, fixed to the rear column 12 with the front lower than the rear, and is used to adjust the support height of the track wheel 31. A middle column 14 is also provided between the front column 11 and the rear column 12, which, together with the rear column 12, provides support for both ends of the track 13.

[0046] The upper ends of the two front support rods 21 are hinged to the sides of the seat cushion frame 2, and the middle parts are hinged to the front uprights 11 of the base frame. The lower ends are connected by a front crossbeam 211. This front crossbeam 211 provides a hinge position for one end of the electric push rod 5. The movement of the electric push rod 5 causes the upper and lower ends of the front support rods 21 to swing in opposite directions, thus pulling the seat cushion frame 2 backward and driving it forward. The front crossbeam 211 also provides the force position for the linkage mechanism 6 of the leg support. This linkage mechanism 6 is located between the front crossbeam 211 and the front end of the seat cushion frame 2. Figure 5 .

[0047] It must be noted that the function of the front upright 11 on the base frame is only to change the swing direction of the upper and lower ends of the front support rod 21. The front upright 11 can also be omitted, or it can be used together with the rear upright 12 to support the track 13. The front support rod 21 and the rear support rod 22 are both directly hinged to the base frame 1, and the hinge points are close to the same horizontal plane. One end of the electric push rod is hinged to the front crossbeam in the middle of the front support rod or the rear crossbeam in the middle of the rear support rod. Both can drive the seat cushion frame 2 and the backrest frame 3 to move back and forth, and realize continuous sitting and reclining changes. In this structure, the forward movement of the seat cushion frame and the backrest frame is greater.

[0048] The linkage mechanism 6 includes a swing rod 61, a long connecting rod 62, a pry bar 63, and a short connecting rod 64. The swing rod 61 is hinged to the front end of the seat cushion frame 2 and has a roller 611 at its lower end. The roller 611 abuts against the back of the leg frame 4 to lift the leg frame 4 so that the lower limbs can be adjusted to a lying angle simultaneously. One end of the long connecting rod 62 is hinged to the swing rod 61 and the other end is hinged to the end of the pry bar 63. The other end of the pry bar 63 is hinged to the front crossbeam 211 of the associated front support rod. One end of the short connecting rod 64 is hinged to the base frame 1 and the other end is hinged to the middle of the pry bar 63, providing a swing fulcrum for the pry bar 63. In other words, when the current crossbeam 211 drives the lower end of the lever 63 to swing backward, because the middle part is constrained by the short connecting rod 64, the upper end of the lever 63 tilts upward and swings forward. Through the long connecting rod 62, it supports the back of the swing rod 61, causing the swing rod 61 to tilt forward and upward, lifting the leg frame 4 with the help of the roller 611; conversely, the roller 611 relieves the force on the leg frame 4 under the load or its own weight, allowing it to swing around the suspension point to a seated position. Figure 1 and Figure 2 Enlarged view of a portion of the image, and Figure 6 and Figure 7 .

[0049] Furthermore, the hinge point B at the upper end of the rear support rod 22 has any of the following structures:

[0050] 1. It is directly hinged to the backrest frame 3 and located below the hinge point A between the backrest frame 3 and the seat cushion frame 2; the rear support rod 22 not only provides indirect support to the rear of the seat cushion frame 2, but also facilitates the design of the seat cushion frame 2's reclining angle, making it easier to adjust to an ergonomic angle. Figure 6 and Figure 7 .

[0051] 2. The upper end of the rear support rod 22 is hinged to the same hinge point A of the backrest frame 3 and the seat cushion frame 2, that is, all three are hinged to the same hinge point. This structure simplifies assembly.

[0052] In both of the above structures, during the forward movement of the backrest frame 3, the swing of the rear support rod 22 is within an acute angle range with the horizontal plane, that is, only within a 90-degree angle range. In other words, when the rear support rod 22 tilts backward, it swings to a maximum upright state, that is, nearly parallel to the vertical plane. Figure 7 Furthermore, the track wheel 31 is always positioned behind the rear support rod 22, which not only avoids interference with the hinge point, but more importantly, provides stable support for the rear point of the backrest frame. The electric push rod 5 and the track wheel 31 together constrain the included angle between the seat cushion frame 2 and the backrest frame 3, thus satisfying the working condition.

[0053] Armrest supports 33 are provided on both sides of the backrest frame 3; the armrest supports 33 have the following two preferred structures:

[0054] I. For example Figures 1 to 5 The armrest is a bent sheet metal part welded to the downward extension 32 at the hinge position of the backrest frame, and extends outward from the upper part to the outside of the seat cushion frame. This allows the armrests to remain synchronized with the backrest frame 3 when adjusting to a reclining position, enabling the upper limbs to move in sync with the upper body. In this structure, the extension 32 can also be used to provide a hinged connection at one end of the electric actuator 5, i.e., hinged to the connecting beam of the extension, increasing the selectability of the drive point for the electric actuator 5.

[0055] II. Figure 6 and Figure 7 It is a metal tube that is directly installed above the hinged position between the backrest frame 3 and the seat cushion frame or rear support rod.

[0056] The above description describes an electric actuator 5 with one end hinged to the base frame 1 and the other end hinged to the middle of the front crossbeam 211 of the front support rod. This drives the front support rod 21 to cause the entire structure to swing. The electric actuator 5 extends to adjust towards a sitting posture and retracts to adjust towards a lying position. This structure is the most reasonable, as the electric actuator 5 can be laid flat on the base frame 1 at the ground position, with a lower center and without taking up space.

[0057] In addition, one end of the electric actuator 5 can also be hinged to the middle of the rear crossbeam 221 of the rear support rod, such as... Figure 6 and Figure 7The dotted-line electric push rod 5 extends to push the rear support rod 22 forward, changing it to a reclining position. Alternatively, one end of the electric push rod 5 is hinged to the connecting beam of the backrest frame extension section 32, which also allows it to extend to a reclining position. In both of these structures, the electric push rod 5 is arranged diagonally below and behind the seat cushion frame 2, and does not occupy the installation space of the massage mechanism. The front support rod 21 swings along with the movement, and then raises the leg rest 4 through the linkage mechanism 6.

[0058] Example 2:

[0059] Reference Figures 8 to 11 The basic structure is the same as the previous example, except that the two front support rods 21 are directly hinged at both ends to the front sides of the base frame 1 and the seat cushion frame 2, and the two rear support rods 22 are hinged at both ends to the base frame 1 and the sides of the seat cushion frame 2 or the backrest frame 3. The two front support rods 21 are connected by a front crossbeam 211, and the two rear support rods 22 are connected by a rear crossbeam 221. In this structure, the hinge position of one end of the electric push rod 5 can be selected to be hinged to the front crossbeam 211, the rear crossbeam 221, or, if the backrest frame has an extension section 32, to the connecting crossbeam of the extension section 32. All of these can drive the seat cushion frame 2 and the backrest frame 3 to move back and forth relative to the base frame 1, producing a continuous change in the included angle. At this time, the linkage mechanism 6 of the leg support 4 needs to be adjusted; it is located between the rear crossbeam 221 and the front end of the seat cushion frame 2.

[0060] The linkage mechanism 6 also includes a swing rod 61, a long connecting rod 62, a pry bar 63, and a short connecting rod 64. The swing rod 61 is still hinged to the front end of the seat frame 2, and a roller 611 is provided at the lower end. The roller 611 abuts against the back of the leg frame 4. One end of the long connecting rod 62 is hinged to the swing rod 61, and the other end is hinged to the end of the pry bar 63. The middle part of the pry bar 63 is hinged to the rear crossbeam 221, and the other end is hinged to one end of the short connecting rod 64. The other end of the short connecting rod 64 is hinged to the base frame 1, restraining one end of the pry bar 63 so that it swings with the rear crossbeam 221.

[0061] Example 3:

[0062] Reference Figure 12 and Figure 13 In addition to the two methods mentioned above that use the linkage mechanism 6 for synchronous linkage, the leg support 4 can also be directly driven by an electric push rod 5. One end of the electric push rod is hinged to the base frame 1, and the other end is hinged to the swing rod 61. One end of the swing rod 61 is hinged to the front end of the seat cushion frame 2, and the other end is hinged to a roller 611 that can rest against the back of the leg support 4. The function of the swing component 61 is the same as in the previous two examples. By adjusting the hinge position of the electric push rod 5, or the long connecting rod 62 in the previous two examples, and the swing rod 61, the swing amplitude of the swing rod 61 can be adjusted to meet the design requirements.

[0063] The electric push rod can be controlled via power on / off commands to coordinate with or design personalized lifting programs for the leg support 4. For example, in a sitting or lying position, the leg support 4 can be swung independently to exercise lower limb movements, meeting personalized needs such as rehabilitation. Although only one electric push rod is added, different functions can be achieved to meet the needs of different groups.

[0064] The terms "front end," "rear end," and "forward" and "backward" used above refer to the direction in which a person sits on the seat cushion 2, with the forward direction being considered the front end or forward, and the back direction being considered the rear end or back. Furthermore, the backrest frame 3 is designed according to the function of different massage mechanisms. For example, for massage mechanisms with a walking function, a track 34 for walking is required in the backrest frame 3, with the track 34 as the main component. A frame 35 is welded to the outside to provide support for the armrests and backrest foam, etc. This example uses this structure, which can meet the needs of walking massage on the backrest. If a fixed-point massage mechanism is used, the track can be omitted, thus strengthening the frame 35. Regardless of the structure, multiple crossbeams 31 are provided on both sides to strengthen the overall function of the backrest frame 3; these are common design features. Additionally, the rear of the seat cushion 2 is an open frame, avoiding space for the massage mechanism's movement.

Claims

1. A massage chair frame, comprising a base frame (1), a seat cushion frame (2), a backrest frame (3), a leg support frame (4), and an electric push rod (5); the backrest frame (3) is disposed at the rear of the seat cushion frame (2), and the seat cushion frame (2) and the backrest frame (3) can change their included angle and move back and forth relative to the base frame (1) under the drive of the electric push rod (5); the leg support frame (4) is suspended at the front end of the seat cushion frame (2) and swings under the drive of a linkage mechanism (6) or the electric push rod; characterized in that: The backrest frame (3) is hinged to the rear of the seat cushion frame (2) to form an adjustable angle. It is supported on the base frame (1) by two front support rods (21) and two rear support rods (22). Each side of the backrest frame (3) is provided with a track wheel (31), which rests on the track (13) on both sides of the base frame (1) to form a rear support. One end of the electric push rod (5) is hinged to the base frame (1) and the other end is hinged to the front support rod (21), the rear support rod (22), or any position of the backrest frame (3) to drive continuous changes in sitting and reclining.

2. A massage chair frame according to claim 1, characterized in that: The upper ends of the two front support rods (21) are hinged to the front sides of the seat cushion frame (2), and the middle part is hinged to the front column (11) of the base frame. The lower ends are connected by a front crossbeam (211). The two rear support rods (22) are hinged to the sides of the base frame (1) and the backrest frame (3) or the seat cushion frame (2), and are connected by a rear crossbeam (221). The front crossbeam (211) or the rear crossbeam (221) provides the hinge position of one end of the electric push rod (5). The linkage mechanism (6) of the leg frame is set between the front crossbeam (211) and the front end of the seat cushion frame (2).

3. A massage chair frame according to claim 1 or 2, characterized in that: The linkage mechanism (6) includes a swing rod (61), a long connecting rod (62), a pry bar (63), and a short connecting rod (64). The swing rod (61) is hinged to the front end of the seat frame (2) and a roller (611) is provided at the lower end. The roller (611) abuts against the back of the leg frame (4). One end of the long connecting rod (62) is hinged to the swing rod (61), and the other end is hinged to the end of the pry bar (63). The other end of the pry bar (63) is hinged to the front crossbeam (211). One end of the short connecting rod (64) is hinged to the base frame (1), and the other end is hinged to the middle of the pry bar (63), providing a swing fulcrum for the pry bar (63).

4. A massage chair frame according to claim 1, characterized in that: Two front support rods (21) are hinged at both ends to the front sides of the base frame (1) and the seat cushion frame (2), and two rear support rods (22) are hinged at both ends to the base frame (1) and the seat cushion frame (2) or the backrest frame (3). The two front support rods (21) are connected by a front crossbeam (211), and the two rear support rods (22) are connected by a rear crossbeam (221). The front crossbeam (211) or the rear crossbeam (221) provides a hinge position for one end of the electric push rod (5). The linkage mechanism (6) of the leg frame (4) is located between the rear crossbeam (221) and the front end of the seat cushion frame (2).

5. A massage chair frame according to claim 1 or 4, characterized in that: The linkage mechanism (6) includes a swing rod (61), a long connecting rod (62), a pry bar (63), and a short connecting rod (64). The swing rod (61) is hinged to the front end of the seat frame (2) and a roller (611) is provided at the lower end. The roller (611) abuts against the back of the leg frame (4). One end of the long connecting rod (62) is hinged to the swing rod (61), and the other end is hinged to the end of the pry bar (63). The middle part of the pry bar (63) is hinged to the rear crossbeam (221), and the other end is hinged to one end of the short connecting rod (64). The other end of the short connecting rod (64) is hinged to the base frame (1), restraining one end of the pry bar (63) so that it swings with the rear crossbeam (221).

6. A massage chair frame according to claim 1, 2 or 4, characterized in that: The hinge point at the upper end of the rear support rod (22) has any of the following structures:

1. It is directly hinged to the backrest frame (3) and located below the hinge point between the backrest frame (3) and the seat cushion frame (2); 2. The upper end of the rear support rod (22) is hinged to the same hinge point between the backrest frame (3) and the seat cushion frame (2); In the above two structures, during the forward movement of the backrest frame (3), the swing of the rear support rod (22) is always within the range of an acute angle with the horizontal plane, and the track wheel (31) is always behind the rear support rod (22).

7. A massage chair frame according to claim 1, characterized in that: Armrest supports (33) are provided on both sides of the backrest frame (3); the armrest supports (33) are any of the following structures:

1. A bent sheet metal part, welded to the downward extension section (32) of the backrest frame (3) at the hinge position, and wrapped around the outside of the seat cushion frame (2) by means of the upper outward fold; 2. A metal tube, directly set above the hinge position of the backrest frame (3) and the seat cushion frame (2) or the rear support rod (22).

8. A massage chair frame according to claim 1, 2 or 4, characterized in that: The front support rod (21) and the rear support rod (22) are tilted forward and backward relative to the vertical plane when the person is sitting. When the person is lying down, the rear support rod (22) is almost parallel to the vertical plane.

9. A massage chair frame according to claim 1, characterized in that: The base frame (1) has rear columns (12) on both sides of the rear. The rear columns (12) are used to fix the track (13). The track (13) is a straight track or an arc track, which is fixed on the rear column (12) with the front lower and the back higher.

10. A massage chair frame according to claim 7, characterized in that: One end of the electric push rod (5) is hinged to the connecting beam of the extension section (32) of the backrest frame.

Images