A seat back frame movement walking mechanism and massage chair

Abstract

The present invention provides a seat back frame movement mechanism and a massage chair, wherein the seat back frame movement mechanism comprises a massage movement, a seat frame assembly, a back frame assembly, a first moving drive source, a first screw transmission mechanism, a second moving drive source, a second screw transmission mechanism and a connecting element; the first screw transmission mechanism comprises a first screw driven to rotate by the first moving drive source, and a first nut seat threadedly matched with the first screw; the second screw transmission mechanism comprises a screw fixing seat fixed to the massage movement, a second screw driven to rotate by the second moving drive source and a second nut seat threadedly matched with the second screw, and the second screw is rotatably supported in the screw fixing seat; the two ends of the connecting element are connected to the first nut seat and the second nut seat. The massage movement can move beyond the range of the first screw, with a large moving range, so that full body massage can be achieved; the back frame assembly has a large adjustable angle, so that the user can achieve a massage posture close to lying flat, and the comfort is improved.

Description

Technical Field

[0001] The invention relates to the field of massage equipment, in particular to a seat-back frame movement running mechanism and a massage chair comprising the seat-back frame movement running mechanism. Background Art

[0002] At present, all massage chairs on the market are equipped with a massage movement, which is movably mounted on the seat frame of the massage chair through a running mechanism. There are two main structures of the running mechanism: one is that the gear on the massage movement is meshed with the rack on the seat frame to drive the massage movement to move, and the other is that the lead screw nut on the massage movement is matched with the lead screw thread on the seat frame to drive the massage movement to move.

[0003] The walking mechanism of the gear rack structure has a simple structure and can achieve massage from the head to the thigh of the human body; however, it limits the angle adjustment of the seat back frame. Of course, there are also a few massage chair companies that have developed some massage chairs that can adjust the angle of the seat back frame, but either mass production is difficult or the adjustment angle of the seat back frame is small, which makes it impossible to meet the comfort of more people and bring more humanized massage experience. For example: a massage chair movement walking mechanism disclosed in the Chinese utility model patent with authorization announcement number CN207979981U drives the massage movement to move through a gear rack transmission. However, due to the use of a gear rack transmission, it also constrains the angle adjustment range of the seat back frame (i.e., the upper guide rail 1 and the lower guide rail 5); when the seat back frame angle is adjusted to a large extent, the gear cannot pass the connection between the upper guide rail 1 and the lower guide rail 5. Therefore, it can only achieve the adjustment of the upper guide rail 1 and the lower guide rail 5 within the range of 110° to 135°. Even if the seat back frame is unfolded to the maximum angle, the thigh and back of the person still have a large angle, and the effect of lying flat cannot be achieved.

[0004] The moving range of the running mechanism of the screw drive structure is small, and the massage movement can only move within the back frame or the seat frame, resulting in a very limited massage area. If you want to massage the head to thigh area at the same time, you need to set up a set of screw drive structures and massage movements in the back frame and the seat frame, that is, you need to configure two sets of massage movements, which greatly increases the cost. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a seat back frame movement running mechanism, wherein the back frame assembly has a large adjustable angle and the massage movement has a large moving range.

[0006] To achieve the above-mentioned object, the present invention provides a seat back frame movement travel mechanism, comprising a massage movement, a seat frame assembly, a back frame assembly rotatably connected to the seat frame assembly, a rotation drive source transmission-connected to the back frame assembly, a first moving drive source installed on the back frame assembly, a first screw transmission mechanism, a second moving drive source, a second screw transmission mechanism, and a connecting element;

[0007] The first screw transmission mechanism includes a first screw driven to rotate by a first moving drive source, and a first nut seat threadedly matched with the first screw, the upper and lower ends of the first screw are rotatably supported in the back frame assembly, the upper end of the first screw extends to the upper end of the back frame assembly, and the lower end of the first screw extends to the seat frame assembly;

[0008] The second screw transmission mechanism comprises two screw fixing seats respectively fixed to the bottom of the upper and lower sides of the massage movement, a second screw driven to rotate by a second mobile driving source, and a second nut seat threadably matched with the second screw, the second mobile driving source is mounted on the screw fixing seat, and the upper and lower ends of the second screw are rotatably supported in the screw fixing seat;

[0009] Two ends of the connecting element are connected to the first nut seat and the second nut seat respectively.

[0010] A preferred embodiment of the above technical solution is that two ends of the connecting element are hinged to the first nut seat and the second nut seat respectively.

[0011] A preferred embodiment of the above technical solution is that both the first mobile driving source and the second mobile driving source are motors.

[0012] A preferred embodiment of the above technical solution is as follows: the rotation driving source is an electric cylinder, and one end of the electric cylinder is hinged to the back frame assembly.

[0013] The preferred scheme of the above technical scheme is: the first screw transmission mechanism also includes a first guide rod parallel to the first screw rod, the two ends of the first guide rod are fixed in the back frame assembly, and the first nut seat is provided with a first guide hole that cooperates with the first guide rod guide; the second screw transmission mechanism also includes a second guide rod parallel to the second screw rod, the two ends of the second guide rod are fixed in the screw fixing seat, and the second nut seat is provided with a second guide hole that cooperates with the second guide rod guide.

[0014] The preferred scheme of the above technical scheme is: rotatable pulleys are provided on the left and right sides of the massage movement, the seat frame assembly includes a seat frame, lower guide rails fixed on the left and right sides of the seat frame, and rotating shaft sleeves installed on the seat frame and distributed on the rear upper end side of each lower guide rail, the back frame assembly includes a back frame frame, and a rotating frame fixed at the front lower end of the back frame frame, the back frame frame is provided with upper guide rails symmetrically arranged on the left and right, the upper end of the rotating frame is provided with a rotating sleeve rotatably matched with the rotating shaft sleeve, and the pulley is movably assembled in the lower guide rail and the upper guide rail.

[0015] The preferred scheme of the above technical scheme is: the seat back frame movement walking mechanism also includes a transition block assembly, the rear section of the lower guide rail is a first arc segment, the back frame assembly also includes a transition block fixing seat fixed on the left and right sides of the rotating frame, the transition block fixing seat is provided with a first transition guide channel that cooperates with the pulley and is connected to the lower end of the upper guide rail, the transition block assembly includes an upper transition block and a lower transition block respectively distributed on the upper and lower sides of the first transition guide channel, and a second transition guide channel formed between the upper transition block and the lower transition block and coordinated with the pulley, the upper transition block and the lower transition block both have a straight line segment fixed on the inner side of the transition block fixing seat, and a second arc segment extending from the end of the transition block fixing seat to the inner side of the first arc segment, the upper transition block and the lower transition block are both installed with a connecting shaft at the end of the second arc segment, the first arc segment is provided with a connecting arc hole that slides with the connecting shaft, and the rotation center of the rotating sleeve and the rotating sleeve, the center of the first arc segment, the center of the second arc segment, and the center of the connecting arc hole are concentrically arranged.

[0016] The preferred scheme of the above technical scheme is: the pulley includes a first wheel body, a second wheel body and a third wheel body which are arranged in sequence along the axial direction, the outer diameters of the first wheel body, the second wheel body and the third wheel body gradually increase, the first wheel body is assembled in the upper guide rail, the first transition guide channel and the lower guide rail, the end face of the second wheel body is abutted and matched with the inner side faces of the upper guide rail, the transition block fixing seat and the lower guide rail, the second wheel body is also assembled in the second transition guide channel, and the end face of the third wheel body is abutted and matched with the inner side faces of the upper transition block and the lower transition block.

[0017] The present application also provides a massage chair, in which the seat back frame movement running mechanism as described above is configured.

[0018] As described above, the seat back frame movement travel mechanism and massage chair according to the present invention have the following beneficial effects:

[0019] In the present application, the massage movement can be driven to reciprocate between the two ends of the back frame assembly by a first screw transmission mechanism. When the massage movement moves to the upper end or the lower end of the back frame assembly, the massage movement is driven to move beyond the range of the first screw by a second screw transmission mechanism, thereby enabling the massage movement to move up to the human head and to the human thigh area. That is, the massage movement in the present application has a large movement range, and only one set of massage movement is required to achieve full body massage. At the same time, since the massage movement is driven to move by a screw transmission mechanism, it will not limit the rotation angle of the back frame assembly, so that the back frame assembly has a larger adjustable angle, and the back frame assembly can be adjusted to a position horizontal with the seat frame assembly. The user can achieve a massage posture close to lying flat, the comfort is greatly improved, and the massage techniques are more diverse. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the seat back frame movement running mechanism in this application.

[0021] Figure 2 It is a structural schematic diagram of the seat frame assembly in this application.

[0022] Figure 3 It is a schematic diagram of the structure of the back frame assembly in this application.

[0023] Figure 4 It is a schematic diagram of the connection between the back frame assembly, the first screw transmission mechanism and the transition block assembly in the present application.

[0024] Figure 5 It is a schematic diagram of the connection between the massage movement, the first screw transmission mechanism and the second screw transmission mechanism in this application.

[0025] Figure 6 This is a schematic diagram of the state in which the pulley moves to the upper guide rail in the present application, and this figure is a cross-sectional view.

[0026] Figure 7 This is a schematic diagram of the state in which the pulley moves to the transition block assembly in the present application, and this figure is a cross-sectional view.

[0027] Figure 8 This is a state diagram of the seat back frame movement walking mechanism in this application when the back frame assembly is at the minimum angle.

[0028] Fig. 9 This is a state diagram of the seat back frame movement walking mechanism in this application when the back frame assembly is at the maximum angle.

[0029] Component number description

[0030] 10 Massage movement

[0031] 101 Axle

[0032] 20 Seat frame assembly

[0033] 21 Seat frame

[0034] 22 Lower rail

[0035] 221 First arc segment

[0036] 222 Connecting arc hole

[0037] 23 Rotating sleeve

[0038] 30 Back frame assembly

[0039] 31 Back Frame

[0040] 32 Rotating frame

[0041] 321 Rotating sleeve

[0042] 33 Upper rail

[0043] 34 Transition block fixing seat

[0044] 341 First Transition Guidance Channel

[0045] 35 Upper support

[0046] 36 Lower support

[0047] 37 Support plate

[0048] 40 First mobile drive source

[0049] 50 First screw transmission mechanism

[0050] 51 First Screw

[0051] 52 First nut seat

[0052] 53 First guide rod

[0053] 54 Screw support seat

[0054] 60 Second mobile drive source

[0055] 70 Second screw transmission mechanism

[0056] 71 Screw fixing seat

[0057] 72 Second screw

[0058] 73 Second nut seat

[0059] 74 Second guide rod

[0060] 80 Connecting elements

[0061] 90 Pulley

[0062] 91 First Wheel

[0063] 92 Second Wheel

[0064] 93 The Third Wheel

[0065] 110 Transition block assembly

[0066] 111 Upper transition block

[0067] 112 Lower transition block

[0068] 113 Second Transition Guidance Channel

[0069] 114 straight line segments

[0070] 115 Second arc segment

[0071] 116 Connecting shaft DETAILED DESCRIPTION

[0072] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0073] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0074] The present application provides a massage chair, and in particular provides a seat and back frame movement running mechanism for the massage chair, wherein the seat and back frame movement running mechanism is used to realize the running of the massage movement 10.

[0075] like Figure 1As shown, the seat back frame movement running mechanism involved in the present application includes a massage movement 10, a seat frame assembly 20, a back frame assembly 30 rotatably connected to the seat frame assembly 20, a rotation drive source transmission-connected to the back frame assembly 30, a first mobile drive source 40 installed on the back frame assembly 30, a first screw transmission mechanism 50, a second mobile drive source 60, a second screw transmission mechanism 70, and a connecting element 80, the back frame assembly 30 is used to support the entire back of the human body and the massage movement 10; wherein, as Figure 4 and Figure 5 As shown, the first screw transmission mechanism 50 includes a first screw 51 driven to rotate by the first mobile driving source 40, and a first nut seat 52 threadedly matched with the first screw 51. The upper and lower ends of the first screw 51 are rotatably supported in the back frame assembly 30, so the first screw 51 can only rotate but not move. The upper end of the first screw 51 extends to the upper end of the back frame assembly 30, and the lower end of the first screw 51 extends to the seat frame assembly 20; the second screw transmission mechanism 70 includes two screws fixed on the upper and lower sides of the massage movement 10, respectively. The screw fixing seat 71 at the bottom, the second screw 72 driven to rotate by the second mobile driving source 60, and the second nut seat 73 threadedly matched with the second screw 72, the second mobile driving source 60 is installed on the screw fixing seat 71, the upper and lower ends of the second screw 72 are rotatably supported in the screw fixing seat 71, so that the second screw 72 can be rotated and moved, and the screw fixing seat 71 is used to fix and support the second screw transmission mechanism 70; the two ends of the connecting element 80 are respectively connected to the first nut seat 52 and the second nut seat 73.

[0076] In the seat frame movement running mechanism, the massage movement 10 is used to massage the human body. When the rotation drive source is activated, the back frame assembly 30 can be driven to rotate relative to the seat frame assembly 20, thereby adjusting the angle of the back frame assembly 30; Figure 8 In the view shown, the angle of the back frame assembly 30 is the smallest, and the back frame assembly 30 is in the initial position; Fig. 9In the view shown, the angle of the back frame assembly 30 is the largest, and the back frame assembly 30 is in a position close to horizontal with the seat frame assembly 20. In particular, when the first mobile drive source 40 is activated, the first screw rod 51 is driven to rotate, and the first nut seat 52 is driven to reciprocate along the first screw rod 51 through the threaded cooperation between the first screw rod 51 and the first nut seat 52. The first nut seat 52 drives the second nut seat 73 to move synchronously through the connecting element 80, so that the second screw transmission mechanism 70 and the massage movement 10 move synchronously with the first nut seat 52, and the massage movement 10 is driven to reciprocate in the back frame assembly 30; when the massage movement 10 moves up to the upper end of the first screw rod 51, the massage movement 10 moves to the position of the human neck, and the second screw transmission mechanism 70 and the massage movement 10 move synchronously with the first nut seat 52. The mobile drive source 60 is activated to drive the second screw rod 72 to rotate. The second screw rod 72 and the second nut seat 73 are threadedly matched to make the second screw rod 72 move axially while rotating. The second screw rod 72 drives the screw rod fixing seat 71 and the massage movement 10 to move axially synchronously, driving the massage movement 10 to continue to move up to the human head. Similarly, when the massage movement 10 moves down to the lower end of the first screw rod 51, the massage movement 10 moves to the human buttocks. Then, the second mobile drive source 60 is activated to drive the massage movement 10 to continue to move down to the human thigh through the second screw rod transmission mechanism 70.

[0077] Therefore, the present application can drive the massage movement 10 to reciprocate between the upper and lower ends of the back frame assembly 30 through the first screw transmission mechanism 50, that is, drive the massage movement 10 to move on the back of the human body; and when the massage movement 10 moves to the upper end or the lower end of the back frame assembly 30, the massage movement 10 is driven by the second screw transmission mechanism 70 to perform a secondary displacement, so that the massage movement 10 can move beyond the range of the first screw 51, thereby enabling the massage movement 10 to move up to the head of the human body and move to the thigh of the human body, so the movement range of the massage movement 10 is large, and only one set of massage movement 10 is provided to achieve full body massage, reducing the cost. At the same time, since the massage movement 10 is driven to move by the screw transmission mechanism, it will not limit the rotation angle of the back frame assembly 30, so that the back frame assembly 30 has a larger adjustable angle, and the back frame assembly 30 can be adjusted to a position horizontal with the seat frame assembly 20, and the user can achieve a massage posture close to lying flat, the comfort is greatly improved, and the massage technique is more abundant.

[0078] Furthermore, if Figure 5As shown, the two ends of the connecting element 80 are hinged to the first nut seat 52 and the second nut seat 73 respectively; in this way, when the massage movement 10 is driven by the second screw transmission mechanism 70 to move beyond the range of the first screw 51, the massage movement 10 and the second screw transmission mechanism 70 can rotate relative to the first screw transmission mechanism 50, so that the angle of the massage movement 10 relative to the first screw transmission mechanism 50 can be adaptively adjusted according to the current state of the user, which solves the problem of the inability to bend the transmission due to the screw transmission, and further improves the massage effect.

[0079] Preferably, the first mobile driving source 40 and the second mobile driving source 60 are both motors, such as servo motors or stepper motors. Figure 5 As shown, the motor shaft of the first mobile driving source 40 is connected to the first screw rod 51 through a pulley mechanism, driving the first screw rod 51 to rotate at a set speed. The motor shaft of the second mobile driving source 60 is directly fixedly connected to the second screw rod 72 through a coupling, driving the second screw rod 72 to rotate at a set speed. The rotation driving source is an electric cylinder, the upper end of the electric cylinder is hinged to the back frame assembly 30, and the lower end of the electric cylinder is hinged to the base of the massage chair; when the piston of the electric cylinder extends, the back frame assembly 30 is driven to rotate upward; when the piston of the electric cylinder retracts, the back frame assembly 30 is driven to rotate downward.

[0080] Furthermore, if Figure 4 As shown, the first screw transmission mechanism 50 also includes a first guide rod 53 parallel to the first screw rod 51. There are two first guide rods 53, which are respectively distributed on the left and right sides of the first screw rod 51. Both ends of the first guide rod 53 are fixed in the back frame assembly 30. The first nut seat 52 is provided with a first guide hole that cooperates with the first guide rod 53. The first guide rod 53 and the first guide hole are also slidably matched, thereby improving the stability of the first nut seat 52 when it moves back and forth along the first screw rod 51. Figure 5 As shown, the second screw transmission mechanism 70 also includes a second guide rod 74 parallel to the second screw rod 72. The second guide rod 74 has one and is distributed on the lower side of the second screw rod 72. Both ends of the second guide rod 74 are fixed in the screw fixing seat 71. A second guide hole that cooperates with the second guide rod 74 is opened in the second nut seat 73. The second guide rod 74 and the second guide hole are also slidably matched, thereby improving the stability of the second screw rod 72 when it reciprocates along the second nut seat 73.

[0081] Furthermore, the connection structure between the first screw rod 51 and the first guide rod 53 and the back frame assembly 30 is as follows: Figure 3 and Figure 4As shown, the back frame assembly 30 is provided with an upper support member 35 perpendicular to the first screw rod 51 at the upper end of the first screw rod transmission mechanism 50, and the back frame assembly 30 is provided with a lower support member 36 parallel to the first screw rod 51 and a support plate 37 perpendicular to the first screw rod 51 at the lower end of the first screw rod transmission mechanism 50, and the support plate 37 is fixed on the lower support member 36, and the first screw rod transmission mechanism 50 is provided with a screw rod support seat 54 at the upper and lower ends, the screw rod support seat 54 at the upper end is attached to and fixed to the upper support member 35, and the screw rod support seat 54 at the lower end is attached to and fixed to the support plate 37; both ends of the first screw rod 51 are rotatably supported in the screw rod support seat 54 through bearings, thereby realizing that the two ends of the first screw rod 51 are rotatably supported in the back frame assembly 30; both ends of the first guide rod 53 are fixed in the screw rod support seat 54, thereby realizing that the two ends of the first guide rod 53 are fixed in the back frame assembly 30. The first moving driving source 40 is fixed to the upper support member 35 .

[0082] Furthermore, if Figure 1 and Figure 5 As shown, the massage movement 10 includes a movement body, axles 101 arranged at the upper and lower ends of the movement body, and pulleys 90 installed at the left and right ends of each axle 101. The second screw transmission mechanism 70 is arranged at the lower end of the movement body. The movement body is provided with a massage component that contacts the human body. The massage movement 10 moves on the back frame assembly 30 and the seat frame assembly 20 through the pulley 90. The preferred structure is as follows: Figure 1 and Figure 2 As shown, the seat frame assembly 20 includes a seat frame 21, lower guide rails 22 fixed to the left and right sides of the seat frame 21, and a rotating shaft sleeve 23 installed on the seat frame 21 and distributed on the rear upper end side of each lower guide rail 22; Figure 1 and Figure 3 As shown, the back frame assembly 30 includes a back frame frame 31 and a rotating frame 32 fixed to the front lower end of the back frame frame 31, and the back frame frame 31 is provided with an upper guide rail 33 symmetrically arranged on the left and right; the upper end of the rotating frame 32 is provided with a rotating sleeve 321 that rotates with the rotating shaft sleeve 23, thereby rotating the seat frame assembly 20 and the back frame assembly 30 to achieve the angle adjustment of the running guide rail of the massage movement 10; the pulley 90 is movably mounted in the lower guide rail 22 or the upper guide rail 33, so that the massage movement 10 can be movably mounted in the upper guide rail 33 of the back frame assembly 30 and the lower guide rail 22 of the seat frame assembly 20. The upper support member 35, the lower support member 36 and the support plate 37 for installing the first screw transmission mechanism 50 are all part of the back frame frame 31.

[0083] Furthermore, if Figure 2 As shown, the rear section of the lower guide rail 22 is a first arc section 221, and the front section of the lower guide rail 22 extends straight along the front-to-back direction; Figure 1 , Figure 3 and Figure 4 As shown, the seat back frame movement walking mechanism also includes a transition block assembly 110, and the back frame assembly 30 also includes a transition block fixing seat 34 fixed on the left and right sides of the rotating frame 32. The transition block fixing seat 34 is provided with a first transition guide channel 341 that cooperates with the pulley 90 and is connected to the lower end of the upper guide rail 33. The transition block assembly 110 includes an upper transition block 111 and a lower transition block 112 respectively distributed on the upper and lower sides of the first transition guide channel 341, and a second transition guide channel 113 formed between the upper transition block 111 and the lower transition block 112 and cooperating with the pulley 90. The upper transition block 111 and the lower transition block 112 are connected to the upper and lower sides of the first transition guide channel 341. The transition block 112 has a straight section 114 fixed on the inner side of the transition block fixing seat 34, and a second arc section 115 extending from the end of the transition block fixing seat 34 to the inner side of the first arc section 221. The upper transition block 111 and the lower transition block 112 are both equipped with a connecting shaft 116 at the end of the second arc section 115. The first arc section 221 is provided with a connecting arc hole 222 that slides with the connecting shaft 116. The rotation centers of the rotating sleeve 23 and the rotating sleeve 321, the center of the first arc section 221, the center of the second arc section 115, and the center of the connecting arc hole 222 are concentrically arranged. Therefore, the upper ends of the upper transition block 111 and the lower transition block 112 extend to the transition block assembly 110, and the lower ends extend to the lower guide rail 22, so the second transition guide channel 113 formed by the upper transition block 111 and the lower transition block 112 is connected to the first transition guide channel 341 and the lower guide rail 22 at the same time, and in the left-right direction, the upper guide rail 33, the first transition guide channel 341 and the lower guide rail 22 are flush, and the second transition guide channel 113 is distributed on the inner side of the upper guide rail 33, the first transition guide channel 341 and the lower guide rail 22. When adjusting the angle of the back frame assembly 30, when the angle of the back frame assembly 30 is small, such as Figure 8 As shown, there is a gap between the back frame assembly 30 and the seat frame assembly 20. At this time, the first transition guide channel 341 and the second transition guide channel 113 can ensure that the pulley 90 moves smoothly and stably in the upper guide rail 33 and the lower guide rail 22 without any jamming. In particular, the rotation centers of the rotating sleeve 23 and the rotating sleeve 321, the center of the first arc segment 221, the center of the second arc segment 115, and the center of the connecting arc hole 222 are concentrically arranged, which can ensure that the upper transition block 111 and the lower transition block 112 are always on the outer peripheral side of the first transition guide channel 341, and no interference will be generated on the pulley 90 in the first transition guide channel 341 during the angle adjustment process of the back frame assembly 30.

[0084] Preferably, if Figure 6 and Figure 7As shown, the pulley 90 includes a first wheel body 91, a second wheel body 92 and a third wheel body 93 arranged in sequence along the axial direction, and the outer diameters of the first wheel body 91, the second wheel body 92 and the third wheel body 93 gradually increase, so the pulley 90 has two step features, one of which is formed between the first wheel body 91 and the second wheel body 92, and the other step feature is formed between the second wheel body 92 and the third wheel body 93. When the pulley 90 moves into the upper guide rail 33, as shown in FIG. Figure 6 As shown, the first wheel body 91 is assembled in the upper guide rail 33, and the end face of the second wheel body 92 is in abutment with the inner side face of the upper guide rail 33. When the pulley 90 moves to the transition block fixing seat 34, the first wheel body 91 is assembled in the first transition guide channel 341, and the end face of the second wheel body 92 is in abutment with the inner side face of the transition block fixing seat 34. At the same time, the second wheel body 92 is also assembled in the second transition guide channel 113, and the end face of the third wheel body 93 is in abutment with the inner side faces of the upper transition block 111 and the lower transition block 112. When the pulley 90 moves to the first arc segment 221 of the lower guide rail 22 and is in the transition block assembly 11, as shown in FIG. Figure 7 As shown, the first wheel body 91 is assembled in the first arc segment 221, the end face of the second wheel body 92 is in abutment with the inner side face of the lower guide rail 22, and at the same time, the second wheel body 92 is also assembled in the second transition guide channel 113, and the end face of the third wheel body 93 is in abutment with the inner side faces of the upper transition block 111 and the lower transition block 112. In this way, the two step features of the pulley 90 not only ensure the sliding of the pulley 90 in the upper guide rail 33 and the lower guide rail 22, but also ensure that when the angle of the back frame assembly 30 is adjusted, the pulley 90 can smoothly pass through the transition block assembly 110 and the transition block fixing seat 34, so that the pulley 90 can smoothly reciprocate between the upper guide rail 33 of the back frame assembly 30 and the lower guide rail 22 of the seat frame assembly 20.

[0085] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0086] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A seat back frame movement mechanism, comprising a massage movement (10), a seat frame assembly (20), a back frame assembly (30) rotatably connected to the seat frame assembly (20), and a rotation driving source drivingly connected to the back frame assembly (30), characterized in that: It also includes a first moving drive source (40) installed on the back frame assembly (30), a first screw transmission mechanism (50), a second moving drive source (60), a second screw transmission mechanism (70), and a connecting element (80); The first screw transmission mechanism (50) comprises a first screw (51) driven to rotate by a first moving drive source (40), and a first nut seat (52) threadedly matched with the first screw (51), the upper and lower ends of the first screw (51) are rotatably supported in the back frame assembly (30), the upper end of the first screw (51) extends to the upper end of the back frame assembly (30), and the lower end of the first screw (51) extends to the seat frame assembly (20); The second screw drive mechanism (70) comprises two screw fixing seats (71) respectively fixed to the bottom of the upper and lower sides of the massage movement (10), a second screw (72) driven to rotate by the second movable driving source (60), and a second nut seat (73) threadedly matched with the second screw (72), the second movable driving source (60) is mounted on the screw fixing seat (71), and the upper and lower ends of the second screw (72) are rotatably supported in the screw fixing seat (71); Two ends of the connecting element (80) are respectively connected to the first nut seat (52) and the second nut seat (73).

2. The seat back frame movement running mechanism according to claim 1, characterized in that: The two ends of the connecting element (80) are respectively hinged to the first nut seat (52) and the second nut seat (73).

3. The seat back frame movement running mechanism according to claim 1, characterized in that: The first moving driving source (40) and the second moving driving source (60) are both motors.

4. The seat back frame movement running mechanism according to claim 1, characterized in that: The rotation driving source is an electric cylinder, one end of which is hinged to the back frame assembly (30).

5. The seat back frame movement travel mechanism according to claim 1, characterized in that: The first screw transmission mechanism (50) further comprises a first guide rod (53) parallel to the first screw rod (51), the two ends of the first guide rod (53) being fixed in the back frame assembly (30), and the first nut seat (52) being provided with a first guide hole for guiding and cooperating with the first guide rod (53); the second screw transmission mechanism (70) further comprises a second guide rod (74) parallel to the second screw rod (72), the two ends of the second guide rod (74) being fixed in the screw fixing seat (71), and the second nut seat (73) being provided with a second guide hole for guiding and cooperating with the second guide rod (74).

6. The seat back frame movement travel mechanism according to claim 1, characterized in that: The massage movement (10) is provided with rotatable pulleys (90) on both sides. The seat frame assembly (20) includes a seat frame (21), lower guide rails (22) fixed on the left and right sides of the seat frame (21), and rotating shaft sleeves (23) installed on the seat frame (21) and distributed on the rear upper end side of each lower guide rail (22). The back frame assembly (30) includes a back frame (31) and a rotating frame (32) fixed on the front lower end of the back frame (31). The back frame (31) is provided with upper guide rails (33) symmetrically arranged on the left and right sides. The upper end of the rotating frame (32) is provided with a rotating sleeve (321) rotatably matched with the rotating shaft sleeve (23). The pulley (90) is movably assembled in the lower guide rail (22) and the upper guide rail (33).

7. The seat back frame movement running mechanism according to claim 6, characterized in that: The back frame assembly (30) further comprises a transition block assembly (110), wherein the rear section of the lower guide rail (22) is a first arc section (221), and the back frame assembly (30) further comprises a transition block fixing seat (34) fixed on the left and right sides of the rotating frame (32), wherein the transition block fixing seat (34) is provided with a first transition guide channel (341) which cooperates with the pulley (90) and is connected to the lower end of the upper guide rail (33), and the transition block assembly (110) comprises an upper transition block (111) and a lower transition block (112) which are respectively distributed on the upper and lower sides of the first transition guide channel (341), and a second transition guide channel (113) which is formed between the upper transition block (111) and the lower transition block (112) and cooperates with the pulley (90), and the upper transition block ( The upper transition block (111) and the lower transition block (112) both have a straight section (114) fixed on the inner side of a transition block fixing seat (34), and a second arc section (115) extending from the end of the transition block fixing seat (34) to the inner side of the first arc section (221); the upper transition block (111) and the lower transition block (112) are both provided with a connecting shaft (116) at the end of the second arc section (115); the first arc section (221) is provided with a connecting arc hole (222) which is slidably matched with the connecting shaft (116); the rotation center of the rotating shaft sleeve (23) and the rotating sleeve (321), the center of the first arc section (221), the center of the second arc section (115), and the center of the connecting arc hole (222) are concentrically arranged.

8. The seat back frame movement running mechanism according to claim 7, characterized in that: The pulley (90) comprises a first wheel body (91), a second wheel body (92) and a third wheel body (93) which are arranged in sequence along the axial direction. The outer diameters of the first wheel body (91), the second wheel body (92) and the third wheel body (93) gradually increase. The first wheel body (91) is assembled in the upper guide rail (33), the first transition guide channel (341) and the lower guide rail (22). The end face of the second wheel body (92) is abutted against the inner side faces of the upper guide rail (33), the transition block fixing seat (34) and the lower guide rail (22). The second wheel body (92) is also assembled in the second transition guide channel (113). The end face of the third wheel body (93) is abutted against the inner side faces of the upper transition block (111) and the lower transition block (112).

9. A massage chair, characterized in that: The massage chair is provided with the seat back frame movement running mechanism as described in any one of claims 1-8.

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