Waist and back massager and seat

Abstract

The waist and back massager comprises a base, a rotating shaft and a driving mechanism for driving the rotating shaft to rotate are arranged on the base, the rotating shaft is connected with two sets of massage swing arms, and the two sets of massage swing arms are each provided with a near end arranged on the rotating shaft in a sleeving mode and a far end extending outwards in the radial direction of the rotating shaft; massage heads are arranged at the far ends of the massage swing arms; a retaining rod is connected between the middle part of the massage swing arm and the base, and the retaining rod and the massage swing arm and / or the retaining rod and the base are rotationally connected; the driving mechanism drives the rotating shaft to rotate forwards, and the near end of the massage swing arm can be forced to swing back and forth in the axial direction of the rotating shaft, so that the massage head at the far end forms kneading massage; the driving mechanism drives the rotating shaft to rotate reversely, the near end of the massage swing arm can be forced to eccentrically swing relative to the rotating shaft, and the massage head at the far end forms knocking massage. The massage device has the beneficial effects that two massage functions of kneading and knocking can be realized by sharing one driving mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of automobile seats, and in particular to a waist and back massager and a seat. Background Art

[0002] In the field of car seat comfort design, seat massage function has gradually become an important part of improving user experience. As people's requirements for driving and riding comfort continue to increase, car seats with multiple massage functions have received more and more attention.

[0003] The patent document with publication number CN119405516A discloses a mechanical waist and back massage assembly and a car seat. The scheme includes a support plate, and two sets of massage arms are rotatably connected to the support plate. By controlling the movement of the two sets of massage arms, the massage head at the far end can perform tapping massage or kneading massage on the user's back. Although the scheme has both tapping and kneading massage functions, the kneading function and the tapping function each have an independent drive mechanism. The two independent drive mechanisms increase the overall complexity of the device, which is not conducive to the lightweight and miniaturized design of the car seat. On the other hand, multiple drive mechanisms will lead to a significant increase in costs, both in the production and manufacturing stage and in the later maintenance stage, which will bring higher costs to automobile manufacturers and consumers. Summary of the invention

[0004] In view of this, one of the objects of the present invention is to provide a waist and back massager that can enable two massage functions, kneading and tapping, to share a driving mechanism.

[0005] To achieve the above purpose, the technical solution of the present invention is as follows:

[0006] A waist and back massager comprises a base, a rotating shaft and a driving mechanism for driving the rotating shaft to rotate are arranged on the base, the rotating shaft is connected to two groups of massage swing arms, the two groups of massage swing arms each have a proximal end sleeved on the rotating shaft and a distal end extending radially outward along the rotating shaft, and a massage head is arranged at the distal end of the massage swing arm; a retaining rod is connected between the middle part of the massage swing arm and the base, and the key point is that the retaining rod and the massage swing arm and / or the retaining rod and the base are in a rotational connection relationship;

[0007] The driving mechanism drives the rotating shaft to rotate forwardly, which can force the proximal end of the massage swing arm to swing back and forth along the axis of the rotating shaft, so that the massage head at the distal end can perform kneading massage;

[0008] The driving mechanism drives the rotating shaft to rotate in the opposite direction, which can force the proximal end of the massage swing arm to swing eccentrically relative to the rotating shaft, so that the massage head at the distal end can perform a percussion massage.

[0009] With the above structure, the driving mechanism drives the rotating shaft to rotate forward, and under the restraining action of the retaining rod, the proximal end of the massage swing arm can be forced to swing back and forth along the axis of the rotating shaft, thereby realizing kneading massage of the user's back by the massage head. The driving mechanism drives the rotating shaft to rotate reversely, and under the action of the retaining rod, the proximal end of the massage swing arm can be forced to swing eccentrically relative to the rotating shaft, thereby realizing tapping massage of the user's back by the massage head. By controlling the rotating shaft to rotate forward or reverse, the two massage functions of kneading and tapping the waist and back can be realized, that is, the two functions of kneading and tapping share a set of driving mechanisms.

[0010] As a preferred embodiment, two sets of sleeves are rotatably mounted on the rotating shaft, and annular grooves are provided on the two sets of sleeves. The proximal ends of the two sets of massage swing arms are rotatably mounted on the two annular grooves respectively, and the side walls of the annular grooves are inclined relative to the center line of the rotating shaft, and the two sides of the proximal ends of the massage swing arms are in sliding contact with the side walls of the corresponding annular grooves respectively;

[0011] The two groups of sleeves are eccentrically sleeved on the rotating shaft through one-way bearings. With the above structure, the driving mechanism drives the rotating shaft to rotate forward, and the one-way bearing can transmit the transmission to the sleeve to make the sleeve rotate, and the sleeve rotation can transmit the transmission to the massage swing arm. At this time, the inclined side wall of the annular groove and the side wall of the massage swing arm form an inclined cam transmission, and coupled with the restraining effect of the retaining rod, the rotation of the rotating shaft can force the massage swing arm to swing back and forth along the axis of the rotating shaft, that is, the massage swing arm can swing left and right, so that the massage head at the far end can form a reciprocating swinging kneading massage on the user's back. The driving mechanism drives the rotating shaft to rotate in the opposite direction. At this time, the one-way bearing does not transmit the transmission, and the sleeve cannot rotate with the rotating shaft. Since the sleeve is eccentrically sleeved on the rotating shaft through the one-way bearing, that is, the center lines of the two one-way bearings are eccentrically arranged relative to the center line of the rotating shaft. Therefore, the rotating shaft rotates in the opposite direction, and under the action of the eccentric transmission, coupled with the mutual cooperation of the retaining rod, the rotational motion of the rotating shaft can be converted into the forward and backward swinging of the massage swing arm, so that the massage head can achieve a reciprocating percussion massage on the user's back.

[0012] Preferably, the two sets of sleeves are eccentric in opposite directions relative to the rotating shaft. With the above structure, when the rotating shaft is reversed, the two eccentric cams can drive the two sets of massage swing arms to swing in different directions, so that the two massage heads can perform reciprocating and alternating massage on the user's back, thereby improving the massage experience.

[0013] Preferably, a retaining ring is fixedly provided at one end of the sleeve, an annular boss protruding outward is provided on the surface of the sleeve near the retaining ring, and the inner side wall of the retaining ring and the space enclosed by the inner side wall of the annular boss and the circumferential surface of the sleeve constitute the annular groove. With the above structure, the retaining ring can ensure that the proximal end of the massage swing arm is always in the corresponding annular groove.

[0014] Preferably, the driving mechanism includes a motor, and the motor can drive the rotating shaft to rotate directly or through a reduction assembly. With the above structure, the forward and reverse rotation of the motor can directly or indirectly drive the rotating shaft to rotate forward and reverse.

[0015] Preferably, the holding rod and the massage swing arm are connected by a ball joint, and the holding rod and the base are connected by a rotation. The above structure can improve the flexibility of the massage swing arm.

[0016] Preferably, the massage arm is made of metal material, and a heating element is provided at the distal end of the massage arm, and the heating element can transfer heat to the massage head by heat conduction. With the above structure, the massage head is heated up, which can bring a warm and comfortable massage experience to the user during massage, promote local blood circulation, and enhance the massage effect.

[0017] The second object of the present invention is to provide a chair, including a backrest, the key of which is that the backrest is integrated with the above-mentioned waist and back massager.

[0018] Preferably, the upper end of the base is rotatably connected to the backrest, and a lifting mechanism is provided in the backrest, wherein the lifting mechanism is used to drive the upper end of the base to rotate around the backrest so that the lower part of the base can move forward and backward relative to the backrest.

[0019] Preferably, the lifting mechanism is located at the rear side of the base, and comprises an air bag fixed in the backrest.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. With the waist and back massager provided by the present invention, the driving mechanism drives the rotating shaft to rotate forward, and under the restraining action of the retaining rod, the proximal end of the massage swing arm can be forced to swing back and forth along the axis of the rotating shaft, thereby realizing kneading and massaging the user's back by the massage head. The driving mechanism drives the rotating shaft to rotate in the opposite direction, and under the action of the retaining rod, the proximal end of the massage swing arm can be forced to swing eccentrically relative to the rotating shaft, thereby realizing tapping and massaging the user's back by the massage head. By controlling the rotating shaft to rotate forward or reverse, the two massage functions of waist and back kneading and tapping can be realized, that is, the two functions of kneading and tapping share a set of driving mechanisms, which can simplify the device, reduce costs, have the advantages of simple and compact structure, and contribute to the lightweight design of the seat.

[0022] 2. With the waist and back massager provided by the present invention, the driving mechanism drives the rotating shaft to rotate in the opposite direction, the one-way bearing does not transmit power, and the sleeve cannot rotate with the rotating shaft. Since the sleeve is eccentrically mounted on the rotating shaft through the one-way bearing, that is, the center lines of the two one-way bearings are eccentrically arranged relative to the center line of the rotating shaft, the rotating shaft rotates in the opposite direction. Under the action of the eccentric transmission and the cooperation of the retaining rods, the rotational motion of the rotating shaft can be converted into the forward and backward swinging of the massage swing arm, thereby realizing the reciprocating tapping massage of the user's back by the massage head.

[0023] 3. During massage, the heating element generates heat. The heat generated by the heating element can quickly heat up the massage head by heat conduction, which can bring a warm and comfortable massage experience to the user, promote local blood circulation, and enhance the massage effect.

[0024] 4. The seat provided by the present invention has the advantages of being simple and compact, so that the seat can be compact and lightweight in design while having functions such as percussion massage, kneading massage and lumbar support. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front view of the waist and back massager;

[0026] Figure 2 This is a reference diagram of the use status of the waist and back massager;

[0027] Figure 3 A schematic diagram showing the connection relationship between the massage swing arm 4, the rotating shaft 2 and the driving mechanism 3;

[0028] Figure 4 It is a cross-sectional view of the massage swing arm 4 connected to the rotating shaft 2;

[0029] Figure 5 It is an exploded schematic diagram of the massage swing arm 4 and the rotating shaft 2;

[0030] Figure 6 This is a right side view of the back massager when the back support function is not used;

[0031] Figure 7 This is a right view of the back massager when using the lumbar support function;

[0032] Figure 8 It is a structural schematic diagram of the lifting mechanism B;

[0033] Fig. 9 is a schematic structural diagram of a massage swing arm 4;

[0034] Fig.10 It is a schematic diagram of the structure after the massage swing arm 4 hides the massage head 4a and the metal cover 42;

[0035] Fig.11A schematic diagram showing the boss structure 41 of the massage swing arm 4;

[0036] Fig.12 is a cross-sectional view of the distal end of the massage swing arm 4;

[0037] Fig.13 is a schematic structural diagram of the massage head 4a;

[0038] Fig.14 This is a front view of the seat. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with embodiments and drawings.

[0040] like Fig.14 As shown, a chair includes a backrest A, and a waist and back massager C is integrated and installed inside the backrest A. Figure 1 and 2 The specific structure of the waist and back massager C is as follows: it includes a base 1. In this embodiment, the base 1 includes a mounting substrate 1a and a support plate 1b slidably mounted on the mounting substrate 1a. The mounting substrate 1a is mounted inside the backrest A, and the support plate 1b can slide along the height direction of the mounting substrate 1a. The support plate 1b is provided with a rotating shaft 2 and a driving mechanism 3 for driving the rotating shaft 2 to rotate, wherein two groups of massage swing arms 4 are connected to the rotating shaft 2, and the two groups of massage swing arms 4 have the same structure and are symmetrically arranged along the width direction of the support plate 1b (the width direction of the support plate 1b corresponds to the width direction of the car seat). The massage swing arm 4 has a proximal end sleeved on the rotating shaft 2 and a distal end extending radially outward along the rotating shaft 2, and a massage head 4a is provided at the distal end of the massage swing arm 4. A retaining rod 6 is connected between the middle part of the massage swing arm 4 and the base 1, and the retaining rod 6 and the massage swing arm 4 and / or the retaining rod 6 and the base 1 are in a rotational connection relationship. The driving mechanism 3 drives the rotating shaft 2 to rotate forward, which can force the proximal end of the massage swing arm 4 to swing back and forth along the axis of the rotating shaft 2, so that the massage head 4a at the distal end can perform kneading massage. The driving mechanism 3 drives the rotating shaft 2 to rotate reversely, which can force the proximal end of the massage swing arm 4 to swing eccentrically relative to the rotating shaft 2, so that the massage head 4a at the distal end can perform percussion massage.

[0041] Here, the forward and reverse rotation of the shaft 2 are relative concepts. For example, when the shaft 2 rotates clockwise as the forward rotation direction, the shaft 2 rotates counterclockwise as the reverse rotation direction; when the shaft 2 rotates counterclockwise as the forward rotation direction, the shaft 2 rotates clockwise as the reverse rotation direction.

[0042] Based on the above structural design, the driving mechanism 3 drives the rotating shaft 2 to rotate forward, and under the restraining action of the retaining rod 6, the proximal end of the massage swing arm 4 can be forced to swing back and forth along the axis of the rotating shaft 2, thereby realizing the kneading massage of the user's back by the massage head 4a. The driving mechanism 3 drives the rotating shaft 2 to rotate in the opposite direction, and under the action of the retaining rod 6, the proximal end of the massage swing arm 4 can be forced to swing eccentrically relative to the rotating shaft 2, thereby realizing the tapping massage of the user's back by the massage head 4a. By controlling the rotating shaft 2 to rotate forward or reverse, the two massage functions of kneading and tapping the waist and back can be realized, that is, the two functions of kneading and tapping share a set of driving mechanisms, which can simplify the device, reduce costs, have the advantages of simple and compact structure, and contribute to the lightweight design of the seat.

[0043] Further, such as Figure 3 and 4 As shown, two sets of sleeves 21 are rotatably mounted on the rotating shaft 2, and an annular groove 211 is provided on both sets of sleeves 21. The ends of the two sets of massage swing arms 4 away from the massage head 4a are respectively rotatably mounted on the two annular grooves 211. The side walls of the annular groove 211 are both inclined relative to the center line of the rotating shaft 2, that is, an angle is formed between the center line of the annular groove 211 and the center line of the first rotating shaft B1, and the two sides of the massage swing arms 4 close to the corresponding end of the sleeve 21 are respectively in sliding contact with the side walls of the annular groove 211. The two sets of sleeves 21 are symmetrically arranged on the rotating shaft 2. The two sets of sleeves 21 are eccentrically mounted on the rotating shaft 2 through a one-way bearing 22. In this embodiment, the positive rotation direction of the rotating shaft 2 is the transmission direction of the one-way bearing 22. The positions on the rotating shaft 2 corresponding to the two sets of sleeves 21 are both provided with eccentric cams 24 protruding radially outward, and the two sets of sleeves 21 are respectively mounted on the two eccentric cams 24 through a one-way bearing 22.

[0044] Based on this, the working principle of the kneading massage is as follows: the driving mechanism 3 drives the rotating shaft 2 to rotate forward, and the one-way bearing 22 can transmit the transmission to the sleeve 21 to make the sleeve 21 rotate, and the rotation of the sleeve 21 can transmit the transmission to the massage swing arm 4. At this time, the inclined side wall of the annular groove 211 and the side wall of the massage swing arm 4 form an inclined cam transmission, and coupled with the restraining effect of the retaining rod 6, the rotation of the rotating shaft 2 can force the massage swing arm 4 to swing back and forth along the axis of the rotating shaft 2, that is, the massage swing arm 4 can swing left and right, so that the massage head 4a at the far end forms a reciprocating kneading massage on the user's back.

[0045] The working principle of the percussion massage is as follows: the driving mechanism 3 drives the rotating shaft 2 to rotate in the opposite direction. At this time, the one-way bearing 22 does not transmit the power, and the sleeve 21 cannot rotate with the rotating shaft 2. Since the sleeve 21 is eccentrically mounted on the rotating shaft 2 through the one-way bearing 22, that is, the center lines of the two one-way bearings 22 are eccentrically arranged relative to the center line of the rotating shaft 2. Therefore, the rotating shaft 2 rotates in the opposite direction, and under the action of the eccentric transmission and the cooperation of the retaining rod 6, the rotational motion of the rotating shaft 2 can be converted into the forward and backward swing of the massage swing arm 4, so that the massage head 4a can perform a reciprocating percussion massage on the user's back.

[0046] Depend on Figure 4 It can be seen that in this embodiment, the eccentric directions of the two sets of sleeves 21 relative to the rotating shaft 2 are opposite, that is, the eccentric directions of the two eccentric cams 24 relative to the rotating shaft 2 are opposite. With such a design, when the rotating shaft 2 is reversed, the two eccentric cams 24 can drive the two sets of massage swing arms 4 to swing in different directions, so that the two massage heads 4a perform reciprocating and alternating tapping massage on the user's back, thereby improving the massage experience.

[0047] like Figure 1 As shown, in this embodiment, the holding rod 6 and the massage swing arm 4 are connected by a ball joint, and the holding rod 6 and the base 1 are connected by a rotation. With such a design, when performing kneading massage, the rotating shaft 2 rotates forward, and the massage swing arm 4 can swing left and right with the hinge point between the holding rod 6 and the massage swing arm 4 as the fulcrum; when performing percussion massage, the rotating shaft 2 rotates reversely, and the massage swing arm 4 can swing forward and backward with the hinge point between the holding rod 6 and the massage swing arm 4 as the fulcrum, further improving the flexibility of the movement of the massage swing arm 4.

[0048] Please refer to Figure 4 and 5 For easy assembly, a retaining ring 23 is fixedly provided at one end of the sleeve 21, and an annular boss 2a protruding outward is provided on the surface of the sleeve 21 near the retaining ring 23. The inner side wall of the retaining ring 23 and the space enclosed by the inner side wall of the annular boss 2a and the circumferential surface of the sleeve 21 form an annular groove 211. In this embodiment, a C-shaped retaining spring is fixedly sleeved on the outer side of the retaining ring 23 on the sleeve 21. When the sleeve 21 rotates forward with the rotating shaft 2, the retaining ring 23 and the C-shaped retaining spring can ensure that the proximal end of the massage swing arm 4 is always in the corresponding annular groove 211. When the rotating shaft 2 rotates in the reverse direction, the retaining ring 23 and the C-shaped retaining spring can ensure that the proximal end of the massage swing arm 4 and the annular groove 211 remain relatively fixed.

[0049] like Figure 2 As shown, the driving mechanism 3 includes a motor 31, which can drive the rotating shaft 2 to rotate directly or through a reduction assembly. The forward and reverse rotation of the motor 31 can directly or indirectly drive the rotating shaft 2 to rotate forward and reverse.

[0050] In this embodiment, the motor 31 can drive the rotating shaft 2 to rotate through the reduction assembly, specifically as follows: an output component 32 is sleeved on the output shaft of the motor 31, and the motor 31 drives the output component 32 to rotate, which can drive the rotating shaft 2 to rotate under the transmission action of the reduction assembly.

[0051] For further reference, Figure 3 In this embodiment, the output component 32 is a worm, and the reduction assembly includes a transmission shaft 3a rotatably arranged above the output component 32. The transmission shaft 3a is respectively sleeved with a transmission gear 33 and a first gear 34 at both ends along its axial direction, and a second gear 35 is sleeved on the rotating shaft 2, wherein the transmission gear 33 is meshed with the worm, and the first gear 34 is meshed with the second gear 35. The motor 31 drives the output component 32 to rotate, which can drive the transmission gear 33 to rotate and transmit the first gear 34 on the transmission shaft 3a. The transmission of the first gear 34 can drive the second gear 35 to transmit. Such a design increases the stability of the transmission.

[0052] like Fig. 9 As shown, the massage swing arm 4 is made of metal material, and a heating element 5 is provided at the far end of the massage swing arm 4. Since metal has good thermal conductivity, the heating element 5 can transfer heat to the massage head 4a in a heat conduction manner.

[0053] Specifically, Figures 10 to 13 As shown, a boss structure 41 of an annular structure is provided at one side of the distal end of the massage swing arm 4, and the massage head 4a is constructed as a roller structure. An annular groove 4a1 is provided at one side of the massage head 4a, and the annular groove 4a1 is mounted on the boss structure 41, that is, the inner wall of the annular groove 4a1 is in contact with the outer wall of the boss structure 41. The heating element 5 generates heat, and the heat generated by the heating element 5 can be quickly transferred to the boss structure 41 through the massage swing arm 4. Since the massage head 4a is mounted on the boss structure 41 through the annular groove 4a1, there is a large contact area between the two, so the massage head 4a can be quickly heated up by heat conduction, which can bring a warm and comfortable massage experience to the user during massage, promote local blood circulation, and enhance the massage effect.

[0054] Please refer to Fig.10 and 12The heating element 5 includes a heating plate 51 fixed on the outer side of the distal end of the massage swing arm 4. The heat generated by the heating plate 51 can be transferred to the boss structure 41 through the massage swing arm 4, and then transferred to the massage head 4a by the boss structure 41. A temperature sensor 52 is fixed on the heating plate 51. The temperature sensor 52 can detect the temperature change of the heating plate 51 to ensure that the temperature of the heating plate 51 and the massage head 4a is always maintained within a suitable range, which can provide users with a safe, comfortable and stable massage experience. In this embodiment, the heating plate 51 has a heating layer, and the heating layer can generate heat using a resistance wire or a graphene material. Both heating methods have the advantages of good heating performance and good stability.

[0055] like Fig. 9 and 10 As shown, a metal cover 42 is provided at a position corresponding to the heating element 5 on the massage swing arm 4, and the metal cover 42 is provided outside the heating element 5. In this embodiment, the metal cover 42 and the massage swing arm 4 are both made of aluminum alloy. The advantage of this design is that the metal cover 42 can protect the heating element 5. At the same time, the metal cover 42 made of aluminum alloy also has good thermal conductivity. When in use, it can cooperate with the heating element 5 to dissipate heat and transfer the heat to the corresponding area of ​​the backrest in the form of thermal radiation, so that the user's back can feel warm, further improving the comfort of massage.

[0056] In this embodiment, the upper end of the mounting base 1a is rotatably connected to the backrest A. Figure 6 and 7 As shown, a lifting mechanism B is provided inside the backrest A, and the lifting mechanism B can drive the upper end of the mounting base plate 1a to rotate around the backrest A, so that the lower part of the mounting base plate 1a can move forward and backward relative to the backrest A. By rotating and connecting the upper end of the mounting base plate 1a to the backrest A, the lifting mechanism B drives the upper end of the mounting base plate 1a to rotate around the backrest A, and the lower part of the mounting base plate 1a moves forward and backward, so that the front and rear protrusion state of the lumbar area of ​​the seat can be changed, and the front and rear adjustment of the lumbar support can be achieved. The support plate 1b slides up and down along the height direction of the mounting base plate 1a, which can change the upper and lower protrusion state of the lumbar area of ​​the seat, and the upper and lower adjustment of the lumbar support can be achieved.

[0057] Furthermore, Figures 6 to 8 As shown, the lifting mechanism B is located at the rear side of the mounting base plate 1a, and includes an air bag B1 fixed in the backrest A, and the air bag B1 is connected to an air pump. When the lumbar support is not in use, the air bag B1 is in an uninflated state, and the air bag B1 is close to the rear side of the mounting base plate 1a. When the lumbar support function is needed, the air pump inflates the air bag B1, and the air bag B1 expands, which can push the lower part of the mounting base plate 1a forward.

[0058] Furthermore, if Figure 6 and 7As shown, the lifting mechanism B also includes a mounting plate B2 arranged on the rear side of the mounting base plate 1a, the upper end of the mounting base plate 1a is rotatably connected to the upper end of the mounting plate B2, the lower end of the mounting base plate 1a is in a suspended state, and the air bag B1 is fixed on the mounting plate B2. The air bag B1 expands, which can cause the upper end of the mounting base plate 1a to rotate upward around the upper end of the mounting plate B2, and the lower end of the mounting base plate 1a is pushed forward relative to the backrest A. When the air bag B1 is deflated, the mounting base plate 1a can rotate downward due to gravity, and the lower end of the mounting base plate 1a can move toward the mounting plate B2. Such a structural design is simple and compact, which enables the car seat to achieve a compact and lightweight design on the basis of having functions such as lumbar support and massage.

[0059] Reference Figure 8 In order to improve the front and rear adjustment range of the lumbar support, the number of air bags B1 is at least two, and two adjacent air bags B1 are overlapped.

[0060] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention, and such changes all fall within the scope of protection of the present invention.

Claims

1. A back massager, comprising a base (1), the base (1) being provided with a rotating shaft (2) and a driving mechanism (3) for driving the rotating shaft (2) to rotate, the rotating shaft (2) being connected with two groups of massage swing arms (4), the two groups of massage swing arms (4) both having a proximal end sleeved on the rotating shaft (2) and a distal end extending radially outwardly along the rotating shaft (2), the distal end of the massage swing arm (4) being provided with a massage head (4a); a retaining rod (6) being connected between the middle part of the massage swing arm (4) and the base (1), characterized in that: The retaining rod (6) and the massage swing arm (4) and / or the retaining rod (6) and the base (1) are in a rotationally connected relationship; The driving mechanism (3) drives the rotating shaft (2) to rotate forward, which can force the proximal end of the massage swing arm (4) to swing back and forth along the axial direction of the rotating shaft (2), so that the massage head (4a) at the distal end can perform kneading massage; The driving mechanism (3) drives the rotating shaft (2) to rotate in the opposite direction, which can force the proximal end of the massage swing arm (4) to swing eccentrically relative to the rotating shaft (2), so that the massage head (4a) at the distal end can form a percussion massage.

2. The back massager according to claim 1, characterized in that: Two groups of sleeves (21) are rotatably mounted on the rotating shaft (2), and an annular groove (211) is provided on the two groups of sleeves (21). The proximal ends of the two groups of massage swing arms (4) are rotatably mounted on the two annular grooves (211), and the side walls of the annular grooves (211) are inclined relative to the center line of the rotating shaft (2), and the two sides of the proximal ends of the massage swing arms (4) are in sliding contact with the side walls of the corresponding annular grooves (211). The two sets of sleeves (21) are eccentrically sleeved on the rotating shaft (2) via a one-way bearing (22).

3. The back massager according to claim 2, characterized in that: The eccentric directions of the two groups of sleeves (21) relative to the rotating shaft (2) are opposite.

4. The back massager according to claim 2, characterized in that: A retaining ring (23) is fixedly provided at one end of the sleeve (21); an annular boss (2a) protruding outward is provided on the surface of the sleeve (21) near the retaining ring (23); the inner wall of the retaining ring (23) and the space enclosed by the inner wall of the annular boss (2a) and the circumferential surface of the sleeve (21) constitute the annular groove (211).

5. The back massager according to claim 1, characterized in that: The driving mechanism (3) comprises a motor (31), and the motor (31) can drive the rotating shaft (2) to rotate directly or via a reduction assembly.

6. The back massager according to claim 1 or 2, characterized in that: The retaining rod (6) and the massage swing arm (4) are connected by a ball joint, and the retaining rod (6) and the base (1) are connected by rotation.

7. The back massager according to claim 1, characterized in that: The massage swing arm (4) is made of metal material. A heating element (5) is provided at the far end of the massage swing arm (4). The heating element (5) can transfer heat to the massage head (4a) in a heat conduction manner.

8. A chair, comprising a backrest (A), characterized in that: The backrest (A) is integrated with a waist and back massager as claimed in any one of claims 1 to 7.

9. The seat according to claim 8, characterized in that: The upper end of the base (1) is rotatably connected to the backrest (A), and a lifting mechanism (B) is provided inside the backrest (A). The lifting mechanism (B) is used to drive the upper end of the base (1) to rotate around the backrest (A), so that the lower part of the base (1) can move forward and backward relative to the backrest (A).

10. The seat according to claim 9, characterized in that: The lifting mechanism (B) is located at the rear side of the base (1), and comprises an air bag (B1) fixed in the backrest (A).

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