A chair

Abstract

The present invention discloses a chair, comprising a base frame, an adjusting device, a back frame and a seat frame, wherein the back frame and the seat frame are hinged, and the adjusting device is used to adjust the angle between the back frame and the seat frame; the adjusting device comprises a driving mechanism and two sets of left and right connecting rod mechanisms, wherein the driving mechanism is mounted on the base frame, and the connecting rod mechanism is mounted on a seat fixing member and a back frame fixing member, and the driving mechanism drives the seat frame to move forward and backward in a horizontal direction, and drives the back frame to rotate through the connecting rod mechanism; the connecting rod mechanism comprises a first driving rod, a second driving rod and a first driven rod, and the technical solution drives the seat frame to move horizontally through the adjusting device, and then drives the back frame to rotate, thereby adjusting the angle between the seat frame and the back frame, and the rotation process of the back frame is made very stable through the first driven rod.

Description

Technical Field

[0001] The invention relates to the technical field of furniture, in particular to a chair. Background Art

[0002] The existing massage chair includes a massage chair frame and a massage device. The massage chair frame is provided with a guide rail. The massage device includes a walking frame. The walking frame can slide up and down along the guide rail. A kneading component for kneading a human body and a knocking component for knocking a human body are installed on the walking frame. A walking component for driving the walking frame to move along the guide rail is provided between the walking frame and the guide rail. The walking component includes an active walking shaft, a walking roller, a walking gear and a walking motor. The active walking shaft is rotatably arranged on the walking frame. The walking motor is fixedly arranged on the walking frame and drives the active walking shaft to rotate. The walking roller is arranged at the end position of the active walking shaft and can roll along the guide rail. The walking gear is arranged beside the walking roller. A rack meshing with the walking gear is provided on the guide rail. The walking motor drives the walking gear to rotate, thereby driving the walking frame to slide up and down along the guide rail.

[0003] The guide rails and racks on this type of massage chair are continuous, and the backrest frame of the massage chair is fixedly connected to the seat frame of the massage chair. However, for massage chairs with adjustable backrest frames, since the backrest frame needs to be flipped over for adjustment, the guide rails and racks on the backrest frame and the seat frame are not continuous. After the backrest frame is flipped over for adjustment, it is difficult for the walking frame to slide from the backrest frame to the seat frame or from the seat frame to the backrest frame. In order to solve this problem, the following methods are usually adopted: one is to set up two sets of massage devices to achieve massage on both the backrest frame and the seat frame, but this increases the cost; the other is to only set up massage devices on the backrest frame or the seat frame, but this reduces the range of massage and has a poor massage effect.

[0004] Therefore, a Chinese patent document with publication number CN107334617A discloses a massage chair movement travel mechanism, including an outer frame composed of an upper slide rail and a lower slide rail, two ends of a massage movement with a power device are mounted on the track groove on the inner side of the outer frame, curved racks are laid on the inner sides of the upper slide rail and the lower slide rail and are hinged to each other, and the side portions are L-shaped with adjustable angles; the massage movement transmits the rotational power to the travel gears on both sides through a reduction mechanism, and the travel gears engage the curved racks, so that the massage movement can reciprocate in the outer frame with the curved racks as a trajectory, thereby enabling the massage movement to travel effectively and reliably; but during the rotation of the lower and upper slide rails, the portion of the curved rack close to the hinge of the lower and upper slide rails is the portion with the largest deformation, and the tooth pitch at this portion will also change, seriously affecting the matching accuracy of the travel gear and the curved rack.

[0005] In addition, the angle adjustment is achieved by extending and retracting the electric cylinder to make the upper and lower slide rails rotate toward or away from each other at the same time. However, when the angle between the seat and the horizontal plane is too large, the person sitting on it will slide backward and downward, thus affecting the massage comfort of the person.

[0006] Therefore, a Chinese patent document with publication number CN209092109U discloses a massage chair, comprising a massage chair frame and a massage device, the massage device comprising a walking frame, a massage assembly and a walking assembly, the massage chair frame comprising a backrest frame and a seat frame, the backrest frame is provided with a frame guide rail, the seat frame is provided with a seat frame guide rail, the frame guide rail is provided with a frame rack, the seat frame guide rail is provided with a seat frame rack at a position corresponding to the frame rack, a reversing member is rotatably arranged between the backrest frame and the seat frame, the reversing member is provided with a transition rack, the transition rack is respectively staggered with the seat frame rack and the frame rack, the walking assembly comprises a first walking shaft and a second walking shaft, the first walking shaft is provided with a first rack that can simultaneously mesh with the frame rack and the transition rack, and the second walking shaft is provided with an interference member for driving the reversing member to flip. By adopting the above scheme, the angle of the backrest frame can be adjusted, and the massage device can slide back and forth between the backrest frame and the seat frame, having a massage function. During this process, the backrest rack, the seat frame rack and the transition rack are not deformed, and the matching accuracy of the running gear and the curved rack will not be affected. However, every time the massage device passes through the transition rack, the transition rack will be deflected, and the massage device can only pass smoothly if the transition rack stays at the specified position. Therefore, when the transition rack does not match well with the backrest rack or the seat frame rack during rotation, the massage device will be stuck.

[0007] In addition, the seat frame in the device is stationary, and the angle adjustment is achieved by rotating the backrest frame through the extension and retraction of the electric push rod, thereby solving the technical problem of reduced massage comfort caused by the tilt of the seat. However, it is obvious that the support of the entire backrest frame can only be achieved by the electric push rod, and the retractability of the electric push rod leads to its unstable support for the backrest frame. Summary of the invention

[0008] In order to solve the second technical problem mentioned above, an object of the present invention is to provide a chair which can adjust the angle between the seat frame and the seat back frame by driving the seat frame to move horizontally and driving the seat back frame to rotate, and the adjustment process is smooth.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A chair, comprising a base frame, an adjustment device, a chair back frame and a chair seat frame, wherein the chair back frame and the chair seat frame are hinged, and the adjustment device is used to adjust the angle between the chair back frame and the chair seat frame; characterized in that:

[0011] The backrest frame includes two left and right backrest fixing members and a plurality of parallel backrest support rods, the seat frame includes two left and right seatrest fixing members, both ends of the backrest support rods are respectively fixedly connected to the left and right backrest fixing members, and the backrest fixing member and the seat fixing member on the same side are hinged at a hinge point A;

[0012] The seat back fixing member and the seat frame fixing member are movably mounted on the base frame through an adjusting device;

[0013] The adjusting device comprises a driving mechanism and two sets of left and right connecting rod mechanisms, wherein the driving mechanism is mounted on the base frame, and the connecting rod mechanisms are mounted on the seat fixing member and the seat back fixing member, and the driving mechanism drives the seat frame to move forward and backward in the horizontal direction, and drives the seat back frame to rotate through the connecting rod mechanisms;

[0014] The connecting rod mechanism includes a first driving rod, a second driving rod and a first driven rod, one end of the first driving rod is hinged to the seat fixing part and the hinge point B, and the first driving rod and the second driving rod are hinged at the hinge point E, the other end of the second driving rod is hinged to the seat back fixing part at the hinge point C, the bottom end of the first driven rod is hinged to the base frame, and the top end is hinged to the seat back fixing part at the hinge point D, and the hinge point D is always higher than the hinge point E, the hinge point B and the hinge point C during the rotation process with the hinge point A as the rotation center.

[0015] Preferably, a cross bar is also provided, which is located in front of the chair seat frame. The first driving rod also includes a footrest. Both ends of the cross bar are installed at the outer ends of the left and right footrests. An angle is formed between the footrest and the straight line passing through the hinge point B and the hinge point E. When the driving mechanism drives the angle between the chair seat frame and the chair back frame to increase, the first driving rod drives the cross bar to rotate upward. When the driving mechanism drives the angle between the chair seat frame and the chair back frame to decrease, the first driving rod drives the cross bar to rotate downward.

[0016] Preferably, the hinge point B is higher than the hinge point E.

[0017] Preferably, the hinge point B is not higher than the hinge point E.

[0018] Preferably, two upper left and right guide rails and two lower left and right guide rails are provided, the upper guide rails are integrally formed with or fixedly connected to the chair back fixing parts, the lower guide rails are integrally formed with or fixedly connected to the seat fixing parts, the upper guide rails are provided with upper guide grooves, the lower guide rails are provided with lower guide grooves, and one end of the upper guide groove close to the seat frame and one end of the lower guide groove close to the chair back frame are always connected during the rotation of the chair back frame.

[0019] Preferably, the upper guide groove includes an upper straight groove and an upper arc groove, and the lower guide groove includes a lower straight groove and a lower arc groove. The upper arc groove and the lower arc groove are both centered at the hinge point A and are staggeredly distributed.

[0020] Preferably, the driving mechanism includes a supporting assembly and a driving device installed on a base frame, the supporting assembly includes a main bracket, a plurality of rollers installed on both sides of the bottom of the main bracket, and two left and right roller grooves fixed on the base frame and consistent with the direction of the base frame, the seat is fixedly connected to the main bracket or integrally formed, and the driving device drives the rollers on both sides of the main bracket to move reciprocatingly along the roller grooves.

[0021] Preferably, a first blocking block is provided at the front end of the rolling groove and a second blocking block is provided at the rear end of the rolling groove, and the driving device drives the rollers on both sides of the main bracket to reciprocate along the roller groove between the first blocking block and the second blocking block.

[0022] Preferably, the driving device is a linear drive, including a driving motor, a linear slot and a walking slider, the walking slider is driven by the driving motor to slide back and forth on the linear slot, the driving motor and the linear slot are fixedly mounted on the base frame, and the walking slider is fixedly connected to the support assembly.

[0023] Preferably, a plurality of evenly distributed positioning columns and mounting holes are provided on the upper surfaces on both sides of the main bracket, and positioning holes cooperating with the positioning columns and long holes corresponding to the mounting holes are provided on the lower surface of the seat fixing piece, and the seat fixing piece is fixed to the main bracket by bolts.

[0024] Technical effects of the present invention:

[0025] 1) The present invention drives the seat frame to move horizontally through the adjusting device, thereby driving the seat back frame to rotate, thereby adjusting the angle between the seat frame and the seat back frame, and the first driven rod makes the rotation process of the seat back frame very stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the chair frame of the present invention;

[0027] Figure 2 for Figure 1 Left view of

[0028] Figure 3 It is a structural schematic diagram of the chassis and the driving mechanism of the present invention;

[0029] Figure 4 It is a schematic structural diagram of the rack assembly of the present invention;

[0030] Figure 5 for Figure 4 A partial enlarged view of

[0031] Figure 6 for Figure 5 A partial explosion diagram of

[0032] Figure 7 It is a structural schematic diagram of the bridge rack of the present invention;

[0033] Figure 8 It is a structural schematic diagram of the upper movable rack of the present invention;

[0034] Fig. 9 It is a structural schematic diagram of the lower rack of the present invention;

[0035] Fig.10 It is a structural schematic diagram of the lower movable rack of the present invention;

[0036] Fig.11 for Fig.10 Rear view of.

[0037] Explanation of reference numerals: 1, chassis; 2, adjustment device; 3, backrest frame; 4, seat frame; 5, massage device; 51, massage mechanism; 31, backrest fixing member; 32, upper guide rail; 33, backrest support rod; 41, seat fixing member; 42, lower guide rail; 52, upper rack; 53, upper movable rack; 54, lower rack; 55, lower movable rack; 56, bridge rack; 57, tension spring; 321, upper guide groove; 421, lower guide groove; 21, driving motor; 22, linear groove; 23, walking slider; 24, main bracket; 25, roller groove; 26, first driving rod; 27, second driving rod; 28, first driven rod; 29, cross bar; 551, first hinge hole; 552, first transition zone; 553, first rack zone; 5531, first common tooth; 5532, first transition tooth; 531, second hinge hole; 532, second transition zone; 533, second rack zone; 5331, second common tooth; 5332, second transition tooth; 561, third hinge hole; 562, third rack zone; 563, third transition zone; 5631, first limiting portion; 5632, second limiting portion; 422, slide groove; 423, elastic member; 534, first mounting groove; 554, second mounting groove; 20, torsion spring; 6, detection device; 511, travel gear; 512, guide wheel. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly specified.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] Embodiment 1:

[0044] like Figure 1 and Figure 2A chair frame shown in the figure comprises a base frame 1, an adjustment device 2, a back frame 3 and a seat frame 4, and a massage device 5 installed on the back frame 3 and the seat frame 4, wherein the back frame 3 and the seat frame 4 are hinged, the adjustment device 2 is used to adjust the angle between the back frame 3 and the seat frame 4, and the massage device 5 comprises a rack assembly installed on the back frame 3 and the seat frame 4 and a massage movement 51 that can reciprocate on the rack assembly;

[0045] The backrest frame 3 includes two left and right backrest fixing members 31, two left and right upper rails 32 and a plurality of parallel backrest support rods 33. The seat frame 4 includes two left and right seatrest fixing members 41 and two left and right lower rails 42. The upper rails 32 are integrally formed with the backrest fixing members 31 or fixedly connected. The lower rails 42 are integrally formed with the seatrest fixing members 41 or fixedly connected. Both ends of the backrest support rods 33 are respectively fixedly connected with the left and right backrest fixing members 31 and the upper rails 32. The backrest fixing members 31 and the seatrest fixing members 41 on the same side are hinged at a hinge point A.

[0046] The seat back fixing member 31 and the seat frame fixing member are movably mounted on the base frame 1 through the adjustment device 2;

[0047] The adjusting device 2 includes a driving mechanism and two sets of left and right connecting rod mechanisms, wherein the driving mechanism is mounted on the base frame 1, and the connecting rod mechanism is mounted on the seat fixing member 41 and the seat back fixing member 31. The driving mechanism drives the seat frame 4 to reciprocate in the horizontal direction, and drives the seat back frame 3 to rotate through the connecting rod mechanism;

[0048] like Figure 4 , Figure 5 and Figure 6 As shown, the rack assembly includes an upper rack 52, an upper movable rack 53, Fig. 9 The lower rack 54 and the lower movable rack 55, as well as the bridge rack 56 and the tension spring 57 shown, the lower rack 54 is slidably mounted on the lower guide rail 42, the upper rack 52 is fixedly connected to the upper guide rail 32, one end of the tension spring 57 is connected to the end of the lower guide rail 42 away from the upper guide rail 32, and the other end is connected to the lower rack 54; the upper movable rack 53, the bridge rack 56 and the lower movable rack 55 are staggered, the lower rack 54, the lower movable rack 55, the upper movable rack 53 and the upper rack 52 are hinged in sequence, and the lower movable rack 55 and the upper movable rack 53 are also hinged to the bridge rack 56 at the same hinge.

[0049] This arrangement is because when the angle of the chair frame is adjusted, a relatively large relative displacement is generated between the seat frame 4 and the back frame 3, while only a relatively small relative displacement is allowed between the rack assemblies. Therefore, the upper rack 52 or the lower rack 54 can slide to alleviate the relatively large relative displacement between the seat frame 4 and the back frame 3, and the curvature change of the rack assembly composed of the upper rack 52, the upper movable rack 53, the lower rack 54, the lower movable rack 55 and the bridge rack 56 is reduced. Through the cooperation of the lower movable rack 55, the upper movable rack 53 and the bridge rack 56, the massage movement 51 can move back and forth smoothly between the seat frame 4 and the back frame 3.

[0050] The tension spring 57 is provided so that when the massage movement 51 passes through the lower moving rack 55, the bridge rack 56 and the upper moving rack 53, the sliding distance of the lower rack 54 is limited to avoid derailment. In addition, when the massage movement 51 passes through the lower moving rack 55, the bridge rack 56 and the upper moving rack 53, the lower moving rack 55 and the upper moving rack 53 need to be adjusted by cooperating with the massage movement 51, and the tension spring 57 is provided so that the lower moving rack 55 and the upper moving rack 53 have adjustment space.

[0051] It is worth noting that the upper rack 52 is slidably mounted on the seat back frame 3 , and the lower rack 54 is fixedly connected to the seat frame 4 . This solution is also feasible.

[0052] The upper guide rail 32 is provided with an upper guide groove 321, and the lower guide rail 42 is provided with a lower guide groove 421. When the driving mechanism drives the seat frame 4 to reciprocate in the horizontal direction to adjust the angle between the back frame 3 and the seat frame 4, the end of the upper guide groove 321 close to the seat frame 4 and the end of the lower guide groove 421 close to the back frame 3 are always connected during the rotation of the back frame 3; further preferably, the upper guide groove 321 includes an upper straight groove 22 and an upper arc groove, and the lower guide groove 421 includes a lower straight groove 22 and a lower arc groove. The upper arc groove and the lower arc groove are both centered on the hinge point A of the backrest fixing part 31 and the seat fixing part 41 and are staggered. The upper arc groove and the lower arc groove together constitute a transition groove so that the massage movement 51 can pass through the upper arc groove and the lower arc groove smoothly.

[0053] like Figure 3As shown, the driving mechanism includes a support assembly and a driving device installed on the base frame 1, the chair seat frame 4 is fixedly installed on the support assembly, and the driving device drives the support assembly to reciprocate along the base frame 1; further preferably, the driving device can be a cylinder, a hydraulic cylinder, an electric push rod or a linear drive or other similar driving devices, the support assembly includes a main bracket 24, and a plurality of rollers installed on both sides of the bottom of the main bracket 24, and two left and right roller grooves 25 fixed on the base frame 1 and consistent with the direction of the base frame 1, the chair seat is fixedly connected to the main bracket 24 or integrally formed, and the driving device drives the rollers on both sides of the main bracket 24 to reciprocate along the roller grooves 25; in addition, in other embodiments, it is also possible to replace the rollers with sliders.

[0054] In an embodiment of the present application, the driving device is a linear drive, including a driving motor 21, a linear slot 22 and a walking slider 23. The walking slider 23 is driven by the driving motor 21 to slide back and forth on the linear slot 22. The driving motor 21 and the linear slot 22 are fixedly mounted on the base frame 1, and the walking slider 23 is fixedly connected to the support assembly.

[0055] The upper surfaces of both sides of the main bracket 24 are provided with a plurality of evenly distributed positioning columns and mounting holes, the lower surface of the seat fixing member 41 is provided with positioning holes matching with the positioning columns, and long holes corresponding to the mounting holes, and the seat fixing member 41 is fixed to the main bracket 24 by bolts.

[0056] The connecting rod mechanism includes a first driving rod 26, a second driving rod 27 and a first driven rod 28, one end of the first driving rod 26 is hinged to the seat fixing part 41 and the hinge point B, and the first driving rod 26 and the second driving rod 27 are hinged at the hinge point E, the other end of the second driving rod 27 is hinged to the seat back fixing part 31 at the hinge point C, the bottom end of the first driven rod 28 is hinged to the base frame 1, and the top end is hinged to the seat back fixing part 31 at the hinge point D, and the hinge point D is always higher than the hinge point E, the hinge point B and the hinge point C during the rotation process with the hinge point A as the rotation center.

[0057] It also includes a horizontally arranged cross bar 29, and a cross bar 29 is also provided. The cross bar 29 is located in front of the seat frame 4. The first driving rod 26 also includes a footrest. The two ends of the cross bar 29 are installed at the outer ends of the left and right footrests. The footrest forms an angle with the straight line passing through the hinge point B and the hinge point E. When the driving mechanism drives the angle between the seat frame 4 and the back frame 3 to increase, the first driving rod 26 drives the cross bar 29 to rotate upward. When the driving mechanism drives the angle between the seat frame 4 and the back frame 3 to decrease, the first driving rod 26 drives the cross bar 29 to rotate downward. It is further preferred that the hinge point E is lower than the hinge point B.

[0058] It is worth noting that the hinge point E needs to be lower than the hinge point B only when and only when the cross bar 29 and the first driving rod 26 are provided to form a footrest device. When the footrest device is no longer needed in this application, there is no positional relationship requirement between the hinge point E and the hinge point B.

[0059] The rack assembly also includes parallel hinge axes A, B and C. One end of the lower rack 54 close to the upper rack 52 is hinged to the middle section of the lower movable rack 55 through the hinge axis A. One end of the upper rack 52 close to the lower rack 54 is hinged to the middle section of the upper movable rack 53 through the hinge axis B. The lower movable rack 55 and the upper movable rack are hinged at both ends close to each other through the hinge axis C. The hinge axis C is installed on the middle section of the bridge rack 56.

[0060] like Fig.10 and Fig.11 As shown, a first hinge hole 551 is provided in the middle part of the side surface of the lower movable rack 55, and the hinge axis A passes through the first hinge hole 551 and is installed on the lower rack 54. The upper surface of the lower movable rack 55 is divided into a first transition area 552 and a first rack area 553 by a surface perpendicular to the surface and coinciding with the center line of the first hinge hole 551. The outer end of the first rack area 553 is hinged to the upper movable rack 53 and the bridge rack 56. The first transition area 552 is a smooth surface and is staggered with the lower rack 54. The first The transition zone 552 gradually descends in the direction away from the first rack zone 553; in this way, when the massage movement 51 moves from the lower rack 54 to the upper rack 52, the massage movement 51 will not get stuck because the first transition zone 552 is higher than the lower rack 54. In addition, if the first transition zone 552 and the first rack zone 553 are not separated by a surface that is perpendicular to the upper surface of the lower movable rack 55 and coincides with the center line of the first hinge hole 551, then a blank area will appear in the transmission between the massage movement 51 and the rack assembly, causing transmission failure.

[0061] The first rack area 553 is provided with a plurality of first common teeth 5531 and a first transition tooth 5532. The first transition tooth 5532 is close to the first transition area 552. The first transition tooth 5532 is lower than the first common teeth 5531 and has an upper surface that is an arc surface. When the backrest frame 3 and the seat frame 4 are at different angles, the tooth pitch between the first transition tooth 5532 and the common teeth on the lower rack 54 will slightly change. Therefore, by lowering the height of the first transition tooth 5532 and setting its upper surface to an arc surface, the massage movement 51 can be well transitioned between the lower rack 54 and the lower movable rack 55.

[0062] like Figure 8As shown, a second hinge hole 531 is provided in the middle part of the side of the upper movable rack 53, and the hinge shaft B passes through the first hinge hole 551 and is installed on the upper rack 52. The upper surface of the upper movable rack 53 is divided into a second transition area 532 and a second rack area 533 by a surface perpendicular to the surface and coinciding with the center line of the second hinge hole 531. The second rack area 533 The outer end is hinged with the lower movable rack 55 and the bridge rack 56, the second transition zone 532 is a smooth surface and is staggered with the upper rack 52, and the second transition zone 532 gradually descends in the direction away from the second rack zone 533; in this way, when the massage movement 51 moves from the upper rack 52 to the lower rack 54, the massage movement 51 will not be stuck because the second transition zone 532 is higher than the upper rack 52. In addition, if the second transition zone 532 and the second rack zone 533 are not distinguished by a surface that is perpendicular to the upper surface of the upper movable rack 53 and coincides with the center line of the second hinge hole 531, then a blank area will appear in the transmission of the massage movement 51 with the rack assembly, causing transmission failure.

[0063] The second rack area 533 is provided with a plurality of second common teeth 5331 and a second transition tooth 5332 . The second transition tooth 5332 is close to the second transition area 532 . The second transition tooth 5332 is lower than the second common tooth 5331 and has an arc surface on its upper surface.

[0064] like Figure 7 As shown, a third hinge hole 561 is provided in the middle part of the side surface of the bridge rack 56, and the hinge axis C passes through the third hinge hole 561 and the upper movable rack 53 and the lower movable rack 55. The upper surface of the bridge rack 56 includes a third rack area 562 located in the middle part, and a third transition area 563 located on both sides of the third rack area 562. The third transition area 563 is a smooth surface and gradually descends in the direction away from the third rack area 562; in this way, when the massage movement 51 reciprocates between the upper rack 52 and the lower rack 54, the massage movement 51 will not get stuck because the third transition area 563 is higher than the upper movable rack 53 or the lower movable rack 55.

[0065] The third transition zone 563 is provided with a first limiting portion 5631 and a second limiting portion 5632 at both ends. The first limiting portion 5631 can touch the lower movable rack 55 during the rotation of the bridge rack 56, and the second limiting portion 5632 can touch the upper movable rack 53 during the rotation of the bridge rack 56 in the other direction. Such a setting can control the rotation amplitude of the bridge rack 56.

[0066] In other embodiments, a torsion spring 20 may be provided between the bridge rack 56 and the hinge axis C to limit the rotation range of the bridge rack 56 and reset the bridge rack 56 at the same time.

[0067] In the embodiment of the present application, the lower guide rail 42 is provided with a slide groove 422 parallel to the lower linear groove 22, and the lower rack 54 can be slidably installed in the slide groove 422. It is further preferred that a connecting piece is also provided, and the connecting piece is detachably installed on the lower rack 54 and connected to the tension spring 57. The groove formed by the lower rack 54 and the connecting piece is clearance-matched with the slide groove 422. Such a setting limits the freedom of the lower rack 54 in four directions of inside and outside and up and down, so that the lower rack 54 can only translate along the direction of the slide groove 422.

[0068] In other embodiments, by providing a slide rail parallel to the lower linear groove 22 on the lower guide rail 42 , the lower rack 54 can only slide along the slide rail.

[0069] In the embodiment of the present application, two fixing seats are further provided on the lower guide rail 42, and elastic members 423 are installed on the fixing seats. The top of the elastic member 423 abuts against the lower surface of the lower movable rack 55, and the two elastic members 423 are respectively located on both sides of the first hinge hole 551;

[0070] One end of the first transition zone 552 away from the first rack zone 553 is located below the lower rack 54 and abuts against the lower surface of the lower rack 54 under the action of two elastic members 423; this arrangement allows the lower moving rack 55 to rotate in only one direction, and thus allows the upper moving rack 53 to rotate in only one direction, that is, the lower moving rack 55 and the upper moving rack 53 can only be arched upwards; this ensures that the massage movement 51 can smoothly pass through the connection between the lower moving rack 55 and the upper moving rack 53.

[0071] Further preferably, the hinge of the upper movable rack 53 and the lower movable rack 55 is provided with a first mounting groove 534 and a second mounting groove 554 facing opposite directions, the first mounting groove 534 is located on the upper movable rack 53, and the second mounting groove 554 is located on the lower movable rack 55; the first mounting groove 534 and the second mounting groove 554 together form an inverted "V"-shaped structure; a torsion spring 20 is also provided, one end of the torsion spring 20 is located in the first mounting groove 534, and the other end is located in the second mounting groove 554. This arrangement is to further ensure that the lower movable rack 55 and the upper movable rack 53 can only be arched upwards, and on the other hand, it can also limit the rotation range of the upper movable rack 53, ensuring that the upper movable rack 53 will not rotate out of position during the angle adjustment process of the adjustment device 2.

[0072] It is worth noting that a circular first protrusion is provided at one end of the lower rack 54 close to the lower movable rack 55, and the first protrusion and the hinge axis A are the center of the circle, and a first groove matching the first protrusion is provided at one end of the lower movable rack 55 close to the lower rack 54; wherein the first protrusion and the first groove may be interchanged;

[0073] The lower movable rack 55 is provided with a circular second protrusion at one end close to the upper movable rack 53, and the second protrusion is centered with the hinge axis B. The upper movable rack 53 is provided with a second groove matched with the second protrusion at one end close to the lower movable rack 55; wherein the second protrusion and the second groove may be interchanged.

[0074] The upper movable rack 53 is provided with a circular third protrusion at one end close to the upper rack 52, and the third protrusion and the hinge axis C are the center of the circle. The upper rack 52 is provided with a third groove matched with the third protrusion at one end close to the upper movable rack 53; wherein the third protrusion and the third groove may be interchanged;

[0075] Such an arrangement can make the structure of the lower rack 54, the lower movable rack 55, the upper movable rack 53 and the upper rack 52 more compact and allow space for rotation between them.

[0076] In the embodiment of the present application, detection devices 6 for detecting the position of the massage movement 51 are respectively provided at both ends of the rack assembly; further preferably, the detection device 6 is a Hall element, one Hall element is fixedly connected to the lower rack 54 or the lower guide rail 42, and the other Hall element is fixedly connected to the upper rack 52 or the upper guide rail 32, and the massage movement 51 moves back and forth between the two Hall elements through the rack assembly.

[0077] The specific structure of the massage movement 51 can refer to the publication numbers CN2922880Y, CN100382775C, CN202505713U, CN208448086U, CN109620672A, CN109846683A, CN100581523C, CN109248042A, CN109259995A, CN208448086U, TW201410230A, CN110353963A, CN110314078A, CN109172253A, CN209392344U, The massage movement 51 disclosed in CN209392345U; generally speaking, the massage movement 51 includes a walking frame and a walking motor and a connecting seat installed on the walking frame, as well as a massage drive device installed on the connecting seat and two support seat assemblies on the left and right sides, and at least one massage roller installed on the support seat assemblies, the massage drive device drives the massage roller to perform massage movements, the walking frame is a frame-type structure, and the front and rear sides of the walking frame are respectively provided with a guide shaft and a walking shaft, and both ends of the walking shaft are provided with a walking gear 511 that cooperates with a rack mechanism, and both ends of the guide shaft are provided with a guide wheel 512 that cooperates with an upper guide groove 321 and a lower guide groove 421, and the walking motor drives the walking shaft to rotate, so that the massage movement 51 moves back and forth between the seat frame 4 and the back frame 3.

[0078] Generally speaking, the massage movement 51 also includes a kneading component, which includes a kneading motor and a kneading shaft installed on a connecting seat, the shaft end of the kneading shaft has a deflection angle with the kneading shaft, the support seat assembly is rotatably installed on the shaft end of the kneading shaft, and the kneading motor drives the kneading shaft to rotate, thereby allowing the massage roller to achieve kneading action.

[0079] The massage movement 51 also includes a knocking assembly, which includes a knocking motor, a knocking shaft, a second sleeve and a ball head connecting rod installed on a connecting seat. The axis line of the end of the knocking shaft deviates from the axis line of the middle section of the knocking shaft. The second sleeve is rotatably installed on the end of the knocking shaft. The ball head connecting rod is used to connect the second sleeve and the support seat assembly. The knocking motor drives the knocking shaft to rotate, thereby allowing the massage roller to perform a knocking action.

[0080] The massage movement 51 also includes a pushing component, which includes a pushing motor and a pushing shaft installed on the walking frame. The pushing shaft is provided with a pushing rack, and an arc-shaped rack is installed on the connecting seat. The pushing rack is meshed with the arc-shaped rack for transmission. The pushing motor drives the pushing shaft to rotate to drive the connecting seat to swing back and forth.

[0081] The specific movement process of the massage movement 51 moving from the upper rack 52 to the lower rack 54 on the rack assembly is as follows:

[0082] 1) The travel motor drives the travel shaft to rotate, driving the travel gear 511 to rotate, and cooperates with the upper linear groove 22 through the guide wheel 512, so that the travel gear 511 moves on the upper rack 52, thereby driving the massage movement 51 to move along the upper rack 52;

[0083] 2) When the traveling gear 511 continues to move to the second transition area 532, the traveling gear 511 is still meshed with the upper rack 52 and does not contact the second transition area 532. When the traveling gear 511 has moved through the area where the upper rack 52 is located, the traveling gear 511 immediately meshes with the second transition tooth 5332 in the second rack area 533;

[0084] 3) When the traveling gear 511 continues to travel to the second rack area 533, it exerts a downward pressure on the second rack area 533 and the third transition area 563, so that the upper moving rack 53 and the lower moving rack 55 gradually approach 180 degrees, and the bridge rack 56 gradually aligns with the upper moving rack 53 and the lower moving rack 55;

[0085] 4) The traveling gear 511 continues to travel to the third rack area 562 , then travels to the first rack area 553 , and travels to the lower rack 54 through the first transition tooth 5532 in the first rack area 553 , without contacting the first transition area 552 during the process.

[0086] The specific movement process of the massage movement 51 moving from the lower rack 54 to the upper rack 52 on the rack assembly is similar to the specific movement process of the massage movement 51 moving from the upper rack 52 to the lower rack 54 on the rack assembly, which will not be described in detail here.

[0087] Embodiment 2:

[0088] The difference between the chair frame in this embodiment and the first embodiment is that the chair back frame 3 and the chair seat frame 4 are fixedly connected or integrally formed, that is, the chair back frame 3 and the chair seat frame 4 cannot rotate;

[0089] In the embodiment of the present application, the seat back frame 3 is provided with an upper guide groove 321, and the seat frame 4 is provided with a lower guide groove 421, and one end of the upper guide groove 321 close to the seat frame 4 is connected to one end of the lower guide groove 421 close to the seat back frame 3;

[0090] The rack assembly includes an upper rack 52, an upper movable rack 53, a lower rack 54 and a lower movable rack 55, and a bridge rack 56. The lower rack 54 is installed on the seat frame 4, and the upper rack 52 is installed on the seat back frame 3. At least one of the lower rack 54 and the upper rack 52 is fixedly connected to the seat frame 4 or the seat back frame 3. The upper movable rack 53, the bridge rack 56 and the lower movable rack 55 are staggered. The lower rack 54, the lower movable rack 55, the upper movable rack 53 and the upper rack 52 are hinged in sequence. The lower movable rack 55 and the upper movable rack 53 are also hinged to the bridge rack 56 at the same hinge.

[0091] It is worth noting that in the embodiment of the present application, the lower rack 54 can be fixedly mounted on the seat frame 4, or it can be slidably mounted on the seat frame 4 through a tension spring 57 as in Example 1; the upper rack 52 can be fixedly mounted on the seat back frame 3, or it can be slidably mounted on the seat back frame 3 through a tension spring 57.

[0092] Embodiment three:

[0093] The difference between the chair frame in this embodiment and the first embodiment is that the adjusting device 2 is only used to control the rotation of the chair back frame 3. The specific structure of the adjusting device 2 can refer to the adjusting device 2 disclosed in the Chinese patent document with publication number CN209092109U.

[0094] Embodiment 4:

[0095] The difference between the chair frame in this embodiment and the first embodiment is that the adjusting device 2 is used to control the chair back frame 3 and the chair seat frame 4 to rotate toward or away from each other. The specific structure of the adjusting device 2 can refer to the adjusting device 2 disclosed in the Chinese patent document with publication number CN107334617A.

[0096] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0097] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A chair, comprising a base frame (1), an adjusting device (2), a seat back frame (3) and a seat frame (4), wherein the seat back frame (3) and the seat frame (4) are hinged, and the adjusting device (2) is used to adjust the angle between the seat back frame (3) and the seat frame (4); characterized in that: The backrest frame (3) comprises two left and right backrest fixing members (31) and a plurality of parallel backrest support rods (33); the seat frame (4) comprises two left and right seatrest fixing members (41); two ends of the backrest support rods (33) are respectively fixedly connected to the two left and right backrest fixing members (31); the backrest fixing member (31) and the seat fixing member (41) on the same side are hinged at a hinge point A; The chair back fixing member (31) and the chair frame fixing member are movably mounted on the base frame (1) via an adjustment device (2); The adjusting device (2) comprises a driving mechanism and two sets of left and right connecting rod mechanisms, wherein the driving mechanism is mounted on the base frame (1), and the connecting rod mechanisms are mounted on the seat fixing member (41) and the seat back fixing member (31). The driving mechanism drives the seat frame (4) to move forward and backward in the horizontal direction, and drives the seat back frame (3) to rotate through the connecting rod mechanisms. The connecting rod mechanism comprises a first driving rod (26), a second driving rod (27) and a first driven rod (28); one end of the first driving rod (26) is hinged to the seat fixing member (41) and the hinge point B, and the first driving rod (26) and the second driving rod (27) are hinged at the hinge point E; the other end of the second driving rod (27) is hinged to the seat back fixing member (31) at the hinge point C; the bottom end of the first driven rod (28) is hinged to the base frame (1), and the top end is hinged to the seat back fixing member (31) at the hinge point D; the hinge point D is always higher than the hinge point E, the hinge point B and the hinge point C during the rotation process with the hinge point A as the rotation center; It also includes a massage device (5) mounted on the chair back frame (3) and the chair seat frame (4), wherein the massage device (5) includes a rack assembly mounted on the chair back frame (3) and the chair seat frame (4) and a massage movement (51) capable of reciprocating on the rack assembly; The rack assembly comprises an upper rack (52), an upper movable rack (53), a lower rack (54), a lower movable rack (55), a bridge rack (56) and a tension spring (57); the lower rack (54) is slidably mounted on the lower guide rail (42); the upper rack (52) is fixedly connected to the upper guide rail (32); one end of the tension spring (57) is connected to one end of the lower guide rail (42) away from the upper guide rail (32); and the other end is connected to the lower rack (54); the upper movable rack (53), the bridge rack (56) and the lower movable rack (55) are staggered; the lower rack (54), the lower movable rack (55), the upper movable rack (53) and the upper rack (52) are hinged in sequence; the lower movable rack (55) and the upper movable rack (53) are also hinged to the bridge rack (56) at the same hinge.

2. A chair according to claim 1, characterized in that: A cross bar (29) is also provided, and the cross bar (29) is located in front of the seat frame (4). The first driving rod (26) also includes a footrest. The two ends of the cross bar (29) are installed on the outer ends of the left and right footrests. The footrest forms an angle with a straight line passing through a hinge point B and a hinge point E. When the driving mechanism drives the angle between the seat frame (4) and the chair back frame (3) to increase, the first driving rod (26) drives the cross bar (29) to rotate upward. When the driving mechanism drives the angle between the seat frame (4) and the chair back frame (3) to decrease, the first driving rod (26) drives the cross bar (29) to rotate downward.

3. A chair according to claim 1 or 2, characterized in that: The hinge point B is higher than the hinge point E.

4. A chair according to claim 1, characterized in that: The hinge point B is not higher than the hinge point E.

5. A chair according to claim 1, characterized in that: Two left and right upper guide rails (32) and two left and right lower guide rails (42) are also provided. The upper guide rails (32) are integrally formed with or fixedly connected to the chair back fixing member (31), and the lower guide rails (42) are integrally formed with or fixedly connected to the chair seat fixing member (41). An upper guide groove (321) is provided on the upper guide rail (32), and a lower guide groove (421) is provided on the lower guide rail (42). An end of the upper guide groove (321) close to the chair seat frame (4) and an end of the lower guide groove (421) close to the chair back frame (3) are always connected during the rotation of the chair back frame (3).

6. A chair according to claim 5, characterized in that: The upper guide groove (321) comprises an upper straight groove (22) and an upper arc groove, and the lower guide groove (421) comprises a lower straight groove (22) and a lower arc groove. The upper arc groove and the lower arc groove are both arranged with the hinge point A as the center and are staggered.

7. A chair according to claim 1, characterized in that: The driving mechanism comprises a supporting assembly and a driving device mounted on a base frame (1); the supporting assembly comprises a main frame (24), a plurality of rollers mounted on both sides of the bottom of the main frame (24), and two left and right roller grooves (25) fixed on the base frame (1) and in the same direction as the base frame (1); the seat is fixedly connected to the main frame (24) or integrally formed; and the driving device drives the rollers on both sides of the main frame (24) to reciprocate along the roller grooves (25).

8. A chair according to claim 7, characterized in that: A first blocking block is provided at the front end of the roller groove and a second blocking block is provided at the rear end of the roller groove, and the driving device drives the rollers on both sides of the main bracket (24) to move back and forth along the roller groove (25) between the first blocking block and the second blocking block.

9. A chair according to claim 7, characterized in that: The driving device is a linear driver, comprising a driving motor (21), a linear slot (22) and a walking slider (23); the walking slider (23) is driven by the driving motor (21) to slide back and forth on the linear slot (22); the driving motor (21) and the linear slot (22) are fixedly mounted on the base frame (1); and the walking slider (23) is fixedly connected to the support assembly.

10. A chair according to claim 7, characterized in that: A plurality of evenly distributed positioning columns and mounting holes are provided on the upper surfaces of both sides of the main bracket (24); positioning holes cooperating with the positioning columns and long holes corresponding to the mounting holes are provided on the lower surface of the seat fixing member (41); the seat fixing member (41) is fixed to the main bracket (24) by bolts.

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