Waist chasing mechanism and seat

Abstract

According to the waist chasing mechanism and the seat, the guide module connected with the waist leaning assembly is hinged to the back support, and the elastic piece directly or indirectly acts on the waist leaning assembly, so that the waist leaning assembly can synchronously move along with the waist; when a seated person leans backwards on the chair seat, the back support and the waist rest assembly rotate backwards to be in an inclined state, the waist rest assembly can move forwards and downwards along with the waist of the seated person, the phenomenon that the waist rest assembly is separated after being rubbed with the waist, and consequently the waist runs is avoided, and therefore the waist rest assembly supports the waist in a self-adaptive mode.

Description

Technical Field

[0001] The utility model relates to the field of seats, in particular to a waist-chasing mechanism and a seat. Background Art

[0002] Since the human waist is in a curve that bends forward, some chairs have a lumbar support at the backrest that can support the waist. The lumbar support is set at the lower end of the chair back and protrudes forward to support the natural curvature of the waist, preventing it from bending outward due to fatigue, thereby ensuring the health of the waist of office workers.

[0003] In order to enrich the use functions of the chairs, some chairs have the backrest that can be rotated backwards, so that the chair has the functions of sitting and lying back. When the user uses this kind of chair, the back of the human body falls backwards on the chair, and the lumbar support and the backrest will rotate backwards. However, due to the height difference between the human waist and the center point of rotation of the lumbar support, the lumbar support rotates backwards to a larger extent after the human body falls forward, which causes the lumbar support to "first rub and then separate" from the waist in the fallen state. This is the so-called "running waist" phenomenon. When the "running waist" phenomenon occurs, the lumbar support can no longer provide support for the waist. Long-term use of this kind of lumbar support will not only fail to improve the user experience of the chair, but will also damage the user's waist.

[0004] Some existing seats will have a front and rear adjustable lumbar support installed on the back support. In order to avoid waist movement, the position of the lumbar support will be adjusted further forward when in use. In this way, when the seat back reclines, the lumbar support positioned forward can make up for the distance difference caused by the lumbar support rotating backward. Since the adjusted lumbar support remains fixed, although it can support the waist, when the reclining angle of the seat back changes, there is still friction between the lumbar support and the waist. Therefore, the front and rear position of the lumbar support cannot change with the change of the reclining angle, making it difficult for the lumbar support to provide adaptive support for the waist. Summary of the invention

[0005] In order to solve the above-mentioned technical problems, the purpose of the utility model is to provide a waist-chasing mechanism, which hinges a guide module connected to the lumbar support assembly on the back support, and enables the elastic member to directly or indirectly act on the lumbar support assembly; when the waist moves up and down relative to the lumbar support assembly, the lumbar support assembly can move simultaneously with the waist, avoiding the phenomenon of separation of the waist and the lumbar support assembly after friction, so that the lumbar support assembly can always effectively support the waist.

[0006] A chair is further provided, in which a back support in the waist-tracking mechanism is rotatably connected to the rear end of the seat. When the occupant leans back, the back support and the waist support assembly rotate backward to a tilted state, and the waist support assembly moves forward and downward along with the occupant's waist, so that the waist support assembly forms an adaptive support for the waist.

[0007] The technical solution of the utility model is achieved in this way:

[0008] A waist-chasing mechanism, comprising:

[0009] A back support configured as a support member of the waist-chasing mechanism;

[0010] A lumbar support assembly is arranged at the front lower part of the back support;

[0011] The guide module is arranged between the back support and the waist support assembly, the front end of the guide module is connected to the waist support assembly; the rear end of the guide module is hinged to the back support;

[0012] An elastic member, the elastic member directly or indirectly acts on the lumbar support assembly;

[0013] In the initial state, the elastic member can provide elastic supporting force for the lumbar support assembly, so that the lumbar support assembly can remain stable at a higher position; when the lumbar support assembly is triggered by a downward external force, the guide module rotates downward and causes the elastic member to produce elastic deformation, and the lumbar support assembly moves downward from a higher position to a lower position under the guidance of the guide module; when the downward external force is removed, the elastic member releases the stored deformation elastic force, and the lumbar support assembly switches from a lower position back to a higher position under the guidance of the guide module.

[0014] Preferably, the front end of the guide module is tilted forward and upward and connected to the lumbar support assembly; when the lumbar support assembly is triggered by an external force, the guide module rotates downward and gradually approaches a horizontal posture from an inclined posture, thereby driving the lumbar support assembly to move forward, so that the lumbar support assembly can fit closely to the waist and form a waist-chasing support for the waist.

[0015] Preferably, the guide module includes an upper guide member and a lower guide member arranged side by side; the front and rear ends of the upper guide member are respectively hinged to the lumbar support assembly and the back support, and the front and rear ends of the lower guide member are respectively hinged to the lumbar support assembly and the back support, so that a deformable four-bar linkage structure is formed between the lumbar support assembly, the back support, and the guide module. The four-bar linkage structure can keep the guide module and the lumbar support in a stable posture at the initial position, so that the lumbar support assembly can provide stable support for the waist.

[0016] Preferably, the upper guide member includes a first arm symmetrically arranged, and the front and rear ends of the first arm are respectively hinged to the lumbar support assembly and the back support; the lower guide member includes a second arm symmetrically arranged, and the front and rear ends of the second arm are respectively hinged to the lumbar support assembly and the back support; thereby, the guide module forms two rotation support points spaced apart from each other on the left and right sides of the lumbar support assembly; the left and right sides of the lumbar support assembly can obtain effective rotation support effect, making the lumbar support effect on the waist more stable.

[0017] Preferably, the length of the first arm is smaller than that of the second arm; when the first arm and the second arm rotate downward, the first arm and the second arm rotate along radii of different lengths, so that the front end of the upper guide member gradually approaches the lower guide member while driving the lumbar support assembly to lean back; so that the lumbar support assembly can better fit and support the waist when it moves downward.

[0018] Preferably, a vertical plate is provided at the upper end of the lower guide member, and an avoidance groove opening toward the vertical plate is provided at the lower end of the upper guide member, and the vertical plate is located in the avoidance groove; when the guide module rotates downward or resets upward, the vertical plate moves in the avoidance groove and always covers the gap formed between the upper guide member and the lower guide member, making the appearance of the entire waist-chasing mechanism more simple and beautiful.

[0019] Preferably, the four-bar structure formed between the lumbar support assembly, the back support, and the guide module has four hinged ends, and the elastic member is a torsion spring arranged at at least one hinged end. The torsion spring can provide sufficient elastic force, and the torsion spring occupies a small space and can be hidden in the hinged end, making the appearance of the entire waist-chasing mechanism more concise.

[0020] Preferably, a protruding limit plate is provided at the rear end of the lower guide member. When the lumbar support assembly moves downward into position, the limit plate abuts against the back support to limit the guide module from continuing to rotate downward, thereby preventing the four-bar structure formed by the lumbar support assembly, the back support and the guide module from excessive deformation, thereby keeping the downward movement of the lumbar support assembly within a reasonable range.

[0021] Preferably, the lumbar support assembly includes a lumbar support member and a base, the base is connected to the front end of the guide module; the lumbar support member includes a connecting portion at its rear end, the lower end of the connecting portion is hinged to the base, thereby forming a hinge point; an adjustment component is provided at the upper end of the connecting portion, and the adjustment component is configured to drive the upper end of the connecting portion to swing in the front and rear directions with the hinge point as the rotation center, thereby moving the lumbar support member forward or backward; thereby, the lumbar tracking mechanism can be suitable for seated occupants of different body shapes.

[0022] Preferably, the adjustment assembly includes a sliding member that can slide left and right, the sliding member is connected to a driving member, and a linkage structure is provided between the sliding member and the connecting part. The driving member can drive the sliding member to slide left and right to trigger the linkage structure, so that the lumbar support member moves forward or retracts backward; thereby making the front and rear support positions of the lumbar support assembly adjustable.

[0023] Preferably, the linkage structure is a slide groove group arranged between the sliding member and the connecting part, and a slide rod assembly inserted into the slide groove group, the slide groove group includes at least two inclined slide grooves spaced apart from each other at the upper end of the connecting part, and the slide rod assembly includes at least two side-by-side slide rods arranged at the bottom of the sliding member; the slide rod is slidably connected in the inclined slide groove, and when the sliding member slides, the slide rod slides in the inclined slide groove to move the lumbar support forward or backward; the slide groove combination and the slide rod assembly cooperate in a simple and efficient manner, and can quickly link the lumbar support member to move forward and backward.

[0024] Preferably, a screw hole is provided on the sliding member, and the axial direction of the screw hole is the same as the sliding direction of the sliding member; the driving member is a screw rod spirally fitted in the screw hole, and a handle is connected to the end of the screw rod away from the sliding member, and the handle can rotate in situ along its own axis under the action of external force to drive the sliding member to slide left and right; the method of driving the screw rod with the handle is simple and labor-saving, and the front and rear position adjustment of the lumbar support member can be quickly realized.

[0025] Preferably, the spiral rod includes an outer spiral tube connected to the screw hole, a transmission rod is passed through the outer spiral tube, and a handle is connected to the end of the transmission rod; the outer spiral tube includes a transmission groove inside itself, and the transmission rod is passed through the transmission groove to drive the outer spiral tube to rotate circumferentially; the split spiral rod can realize transmission through the plug-in cooperation of the transmission rod and the transmission groove, with a simple structure and good transmission effect.

[0026] Preferably, the transmission rod is rotatably connected to the left and right ends of the connecting part to limit the sliding rod on the sliding member from escaping from the inclined sliding groove, so that the sliding rod and the inclined sliding groove can cooperate stably.

[0027] Preferably, a limiting guide rod is passed between the base and the sliding member, and the axial direction of the limiting guide rod is the same as the sliding direction of the sliding member; the limiting guide rod can provide sliding guide for the sliding member, and together with the transmission rod limit the separation of the sliding rod from the inclined sliding groove; so that the sliding rod on the sliding member can be stably slidably connected in the inclined sliding groove.

[0028] Furthermore, a chair is provided, comprising a seat and the waist-chasing mechanism, wherein the lower end of the back support is rotatably connected to the rear end of the seat.

[0029] The principle of the utility model using the above technical solution is:

[0030] The utility model provides a waist tracking mechanism, which hinges a guide module connected to a waist support assembly on a back support and enables an elastic member to directly or indirectly act on the waist support assembly. When the waist moves downward relative to the waist support assembly, the waist support assembly can move downward or reset upward simultaneously with the waist.

[0031] A chair is further provided, in which a back support in a waist tracking mechanism is rotatably connected to the rear end of a seat, so that when the occupant leans back, the back support and the waist support assembly rotate backward to a tilted state, and the waist support assembly moves forward and downward along with the occupant's waist.

[0032] The beneficial effects of the utility model using the above technical solution are:

[0033] 1. When the waist moves downward relative to the lumbar support assembly, the lumbar support assembly can move downward simultaneously with the waist and cause the elastic member to produce elastic deformation; when the waist is reset upward relative to the lumbar support assembly, the elastic member can release the elastic force so that the lumbar support assembly can move upward simultaneously with the waist; therefore, in the entire process of the lumbar support assembly moving up and down, the waist-chasing mechanism avoids the phenomenon of separation of the waist and the lumbar support assembly after friction, so that the lumbar support assembly can always effectively support the waist.

[0034] 2. When the occupant is in a normal sitting position, the lumbar support assembly can provide support for the waist under the action of the elastic member; when the occupant leans back and rotates the back support and the lumbar support assembly backward to an inclined state, the lumbar support assembly can move forward and downward with the waist, so that the lumbar support assembly provides support for the front and lower waist; therefore, no matter whether the waist is in an upright state or a reclining state, the lumbar support assembly can adapt to the changes in the position of the waist, so that the lumbar support assembly provides adaptive support for the waist. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of the lumbar support assembly in a higher position;

[0036] Figure 2 is a schematic diagram of the lumbar support assembly in a lower position;

[0037] Figure 3 It is an enlarged view of the structure of the adjustment component;

[0038] Figure 4 This is an exploded view of the waist-chasing mechanism;

[0039] Figure 5 is a schematic diagram of the structure of the sliding member;

[0040] Figure 6 is a schematic diagram of the structure of the spiral rod;

[0041] Figure 7 This is an exploded view of the guidance module;

[0042] Figure 8 is a schematic diagram of the structure of the base;

[0043] Fig. 9 is an enlarged view of the connecting portion and the sliding member;

[0044] Fig.10a This is a schematic diagram of the structure of the waist-chasing mechanism installed on the seat;

[0045] Fig.10b The schematic diagram of the structure of the lumbar support assembly moving downward on the seat;

[0046] Fig.11 The schematic diagram is a schematic diagram of the guide assembly rotating downward and driving the lumbar support assembly to move forward;

[0047] The figures are marked as follows: 1-back support, 2-mounting seat, 3-torsion spring, 4-guide module, 5-base, 6-sliding member, 7-external spiral tube, 8-spiral rod, 9-lumbar support member, 10-seat, 11-mounting groove, 21-card slot, 41-upper guide member, 42-lower guide member, 411-first arm, 412-avoidance groove, 421-second arm, 422-vertical plate, 423-limiting plate, 51-rotating shaft hole, 52-accommodating groove, 53-limiting wall, 54-limiting guide rod, 61-screw hole, 62-spiral groove, 63-guide hole, 64-sliding rod, 71-transmission groove, 81-transmission rod, 82-handle, 91-connecting part, 92-inclined slide groove, a-hinge point, s-front and rear distance difference. DETAILED DESCRIPTION

[0048] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0049] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0050] The specific implementation of the utility model is as follows:

[0051] like Figure 1-11 As shown, the utility model provides a waist-chasing mechanism, comprising:

[0052] Back support 1, configured as a support member of the waist tracking mechanism;

[0053] A lumbar support assembly is arranged at the front lower part of the back support 1;

[0054] The guide module 4 is arranged between the back support 1 and the waist support assembly, and the front end of the guide module 4 is connected to the waist support assembly; the rear end of the guide module 4 is hinged to the back support 1;

[0055] An elastic member, the elastic member acts directly or indirectly on the lumbar support assembly; there are various forms of the positions of the elastic member, for example, the elastic member can be arranged between the back support 1 and the lumbar support assembly, so that the elastic member acts directly on the lumbar support assembly; the elastic member can also be arranged between the back support 1 and the guide module 4, so that the elastic member acts indirectly on the lumbar support assembly;

[0056] In the initial state, the elastic member can provide elastic supporting force for the lumbar support assembly, so that the lumbar support assembly can remain stable at a higher position; when the lumbar support assembly is triggered by the downward external force, the guide module 4 rotates downward and causes the elastic member to produce elastic deformation, and the lumbar support assembly moves downward from a higher position to a lower position under the guidance of the guide module 4; when the downward external force is removed, the elastic member releases the stored deformation elastic force, and the lumbar support assembly switches from a lower position back to a higher position under the guidance of the guide module 4.

[0057] Further, if Figure 1 , Figure 2 , Fig.11 As shown, the front end of the guide module 4 is tilted forward and upward and connected to the lumbar support assembly; when the lumbar support assembly is triggered by an external force, the guide module 4 rotates downward and gradually approaches a horizontal posture from an inclined posture, thereby driving the lumbar support assembly to move forward; that is, as the guide module 4 gradually approaches a horizontal posture from an inclined posture, there will be a front-to-back distance difference s between the rotation starting point and the rotation ending point of the front end of the guide module 4, so the lumbar support assembly connected to the lower position of the front end of the guide module 4 will be closer to the front than the lumbar support assembly at a higher position, so that the lumbar support assembly can fit closely to the waist and form a waist-chasing support for the waist.

[0058] Further, if Figure 1-5 As shown, the guide module 4 can be an integral part or a component. In this embodiment, the guide module 4 is explained as a component. Specifically, the guide module 4 includes an upper guide member 41 and a lower guide member 42 arranged side by side; the front and rear ends of the upper guide member 41 are respectively hinged to the lumbar support assembly and the back support 1, and the front and rear ends of the lower guide member 42 are respectively hinged to the lumbar support assembly and the back support 1, thereby forming a deformable four-bar structure among the lumbar support assembly, the back support 1 and the guide module 4; the four-bar structure can enable the guide module 4 and the lumbar support in the initial position to maintain a stable posture, so that the lumbar support assembly can provide stable support for the waist.

[0059] Furthermore, the upper guide member 41 and the lower guide member 42 are both plate-like structures. Specifically, the upper guide member 41 includes an upper guide body and a first arm 411 symmetrically arranged on the left and right sides, the first arm 411 is symmetrically connected to the left and right sides of the upper guide body and extends in the front-to-back direction; the front and rear ends of the first arm 411 are respectively hinged to the lumbar support assembly and the back support 1; the lower guide member 42 includes a lower guide body and a second arm 421 symmetrically arranged on the left and right sides, the second arm 421 is symmetrically connected to the left and right sides of the lower guide body and extends in the front-to-back direction; the front and rear ends of the second arm 421 are respectively hinged to the lumbar support assembly and the back support 1; thereby, the guide module 4 forms two rotation support points spaced up and down on the left and right sides of the lumbar support assembly; the left and right sides of the lumbar support assembly can obtain effective rotation support effect, and the lumbar support effect on the waist is more stable.

[0060] Further, if Figure 2 As shown, in order to better support the waist when the lumbar support assembly moves downward, the length of the first arm 411 is smaller than the length of the second arm 421, so the hinge position of the second arm 421 is closer to the front, thereby forming rotation radii of different lengths; when the first arm 411 and the second arm 421 rotate downward, the first arm 411 and the second arm 421 rotate along radii of different lengths, so that the front end of the upper guide member 41 gradually approaches the lower guide member 42 while driving the lumbar support assembly to lean back; so that the lumbar support assembly can better fit and support the waist when it moves downward.

[0061] Further, if Figure 1 , Figure 2 , Figure 7 As shown, the distance between the upper guide member 41 and the lower guide member 42 arranged side by side is relatively close, but when the guide module 4 is observed from the side, there is still a small gap between the upper guide member 41 and the lower guide member 42, which affects the appearance of the waist-chasing mechanism. Therefore, in order to cover the gap, a vertical plate 422 is provided at the upper end of the lower guide member 42, and a avoidance groove 412 opening toward the vertical plate 422 is provided at the lower end of the upper guide member 41, and the vertical plate 422 is located in the avoidance groove 412; when the guide module 4 rotates downward or resets upward, the vertical plate 422 moves in the avoidance groove 412 and always covers the gap formed between the upper guide member 41 and the lower guide member 42, so that the appearance of the entire waist-chasing mechanism is more concise and beautiful.

[0062] Further, if Figure 4 As shown, the four-bar structure formed between the lumbar support assembly, the back support 1, and the guide module 4 has four hinged ends, and the elastic member is a torsion spring 3 arranged at at least one hinged end position; the torsion spring 3 can provide sufficient elastic force, and the torsion spring 3 occupies a small space and can be hidden in the hinged end, making the appearance of the entire waist chasing mechanism more concise; specifically, the back support 1 is provided with a mounting groove 11, and the mounting seat 2 is arranged in the mounting groove 11. The upper guide member 41 and the lower guide member 42 are respectively hinged at the upper and lower ends of the mounting seat 2. In this embodiment, the torsion spring 3 is arranged at the end where the upper guide member 41 and the mounting seat 2 are hinged for explanation; that is, a clamping groove 21 is provided on the mounting seat 2, and the torsion spring 3 includes two elastic arms and a U-shaped connecting portion between the two elastic arms. The U-shaped connecting portion of the torsion spring 3 is clamped in the clamping groove 21, and the two elastic arms act on the upper guide member 41, thereby forming an elastic support for the lumbar support assembly. When the guide module 4 rotates downward, the torsion spring 3 is deformed and provides a reset elastic force for the reset of the four-bar structure.

[0063] Further, if Figure 2As shown, the deformation of the four-bar linkage structure can make the lumbar support assembly move up and down, but the range of movement should not be too large to avoid parts collision or connecting rod jamming caused by excessive deformation of the four-bar linkage; therefore, an outwardly protruding limit plate 423 is provided at the rear end position of the lower guide member 42, and when the lumbar support assembly moves downward into place, the limit plate 423 abuts against the back support 1 to limit the guide module 4 from continuing to rotate downward; prevent the four-bar linkage structure formed by the lumbar support assembly, the back support 1, and the guide module 4 from excessive deformation, and keep the downward movement of the lumbar support assembly within a reasonable range.

[0064] Furthermore, when users of different body shapes and ages sit, their waist positions are also different. Therefore, in order to make the waist-chasing mechanism suitable for a variety of people, the lumbar support 9 can also change the front and rear position through an adjustment component. Specifically, the lumbar support component includes a lumbar support 9 and a base 5, and the base 5 is connected to the front end of the guide module 4; the lumbar support 9 includes a connecting portion 91 at its rear end, and in order to make the lumbar support 9 easier to lean back, the connecting portion 91 is arranged at the lower end of the lumbar support 9; the lower end of the connecting portion 91 is hinged to the base 5, thereby forming a hinge point a; the upper end of the connecting portion 91 is provided with an adjustment component, and the adjustment component is configured to drive the upper end of the connecting portion 91 to swing in the front and rear direction with the hinge point a as the rotation center, thereby moving the lumbar support 9 forward or backward; so that the waist-chasing mechanism can be suitable for seated people of different body shapes.

[0065] Further, if Figure 3-9 As shown, the adjustment component includes a sliding member 6 that can slide left and right, and the sliding member 6 is connected to a driving member. A linkage structure is provided between the sliding member 6 and the connecting portion 91. The driving member can drive the sliding member 6 to slide left and right to trigger the linkage structure, so that the lumbar support member 9 moves forward or retracts backward; wherein the linkage structure is a slide groove group arranged between the sliding member 6 and the connecting portion 91, and a slide rod assembly inserted into the slide groove group, the slide groove group includes at least two inclined slide grooves 92 spaced apart left and right at the upper end of the connecting portion 91, and the slide rod assembly includes at least two side-by-side slide rods 64 arranged at the bottom of the sliding member 6; the slide rod 64 is slidably connected in the inclined slide groove 92, and when the sliding member 6 slides, the slide rod 64 slides in the inclined slide groove 92, so that the lumbar support member 9 moves forward or backward; the way in which the slide groove combination and the slide rod assembly cooperate is simple and efficient, and can quickly link the lumbar support member 9 to move forward and backward.

[0066] Furthermore, a screw hole 61 is provided on the sliding member 6, and a spiral groove 62 is provided in the screw hole 61, and the axial direction of the screw hole 61 is the same as the sliding direction of the sliding member 6; the driving member is a screw rod 8 which is screwed in the screw hole 61, and a handle 82 is connected to the end of the screw rod 8 away from the sliding member 6, and the handle 82 can rotate in situ along its own axis under the action of external force to drive the sliding member 6 to slide left and right; the method of driving the screw rod 8 by the handle 82 is simple and labor-saving, and the front and rear position adjustment of the lumbar support member 9 can be quickly realized; when the sliding member 6 slides to a predetermined position in the left and right direction, the screw rod 8 can limit the sliding member 6 which is screwed in with the screw rod 8 to slide in the opposite direction, so that the lumbar support member 9 remains stable, thereby forming a stable support for the waist.

[0067] Furthermore, a receiving groove 52 is provided at the front end of the base 5, and the sliding member 6 is located in the receiving groove 52. The receiving groove 52 includes left and right opposite limiting walls 53. The sliding member 6 slides between the two left and right opposite limiting walls 53 to drive the lumbar support member 9 to move forward and backward. The limiting wall 53 can limit the sliding range of the sliding member 6, so that the distance of the lumbar support component moving forward and backward is kept within a reasonable range.

[0068] Furthermore, the spiral rod 8 includes an outer spiral tube 7 connected to the screw hole 61, a transmission rod 81 is passed through the outer spiral tube 7, and a handle 82 is connected to the end of the transmission rod 81; the outer spiral tube 7 includes a transmission groove 71 inside itself, the cross-sectional shape of the transmission rod 81 is polygonal (not shown) or cross-shaped, and the cross-sectional shape of the transmission groove 71 matches the cross-sectional shape of the transmission rod 81; the transmission rod 81 is passed through the transmission groove 71 to drive the outer spiral tube 7 to rotate circumferentially; the split spiral rod 81 can realize transmission through the plug-in cooperation of the transmission rod and the transmission groove, and has a simple structure and good transmission effect.

[0069] Furthermore, the slide rod 64 is inserted into the inclined slide groove 92 from above. Therefore, in order to prevent the slide rod 64 from slipping out of the inclined slide groove 92 upward, a rotation shaft hole 51 is provided on the left and right ends of the base, and the transmission rod 81 is rotatably connected to the rotation shaft holes 51 on the left and right ends of the connecting part 91 to limit the slide rod 64 on the sliding member 6 from slipping out of the inclined slide groove 92; so that the slide rod and the inclined slide groove 92 are stably matched.

[0070] Furthermore, in order to make the cooperation between the slide rod 64 and the inclined slide groove 92 more stable, a limiting guide rod 54 is passed between the base 5 and the sliding member 6. Specifically, a guide hole 63 is provided on the sliding member 6 and the base 5, and the limiting guide rod 54 is passed through the guide hole 63. The axial direction of the limiting guide rod 54 is the same as the sliding direction of the sliding member 6; the limiting guide rod 54 can guide the sliding member 6 for sliding, and together with the transmission rod 81, limit the separation of the slide rod 64 from the inclined slide groove 92; so that the slide rod 64 on the sliding member 6 can be stably slidably connected in the inclined slide groove 92.

[0071] Furthermore, the slide bar 64 applies a sliding force in the front-to-back direction to the lumbar support member 9 by squeezing the inner wall of the inclined groove 92, so that the lumbar support member 9 slides back and forth. Therefore, the inclination angle of the inclined groove 92 should be maintained within a reasonable range. In this embodiment, the inclination angle of the inclined groove 92 is 45°. Therefore, the ratio of the left and right sliding length of the slide member 6 and the front and back sliding length of the lumbar support member 9 is one. That is to say, when the slide bar 64 squeezes the inner wall of the 45° inclined groove 92, the displacement of the slide member 6 in the left and right direction and the displacement of the lumbar support member 9 in the front and back direction are the same. At this time, when the handle 82 is turned to drive the slide member to slide, the front and back movement speed of the lumbar support member 9 is faster, so that the lumbar support member 9 can be quickly adjusted into place.

[0072] like Figure 10a-10b As shown, a chair is provided, comprising a seat 10 and the above-mentioned lumbar tracking mechanism, and the lower end of the back support 1 is rotatably connected to the rear end of the seat 10; when the occupant is in a normal sitting state, the lumbar support assembly can support the waist under the action of the elastic member; when the occupant leans back, the back support 1 and the lumbar support assembly rotate to a tilted state at the same time, and the lumbar support assembly moves forward and downward with the occupant's waist, thereby compensating for the position deviation between the waist and the lumbar support assembly due to the different rotation centers, so that the lumbar support assembly forms an adaptive support for the waist, effectively protecting the waist and avoiding the phenomenon of waist running.

[0073] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A waist-chasing mechanism, characterized in that: include: A back support (1) configured as a support member of the waist-chasing mechanism; A lumbar support assembly, arranged at the front lower part of the back support (1); The guide module (4) is arranged between the back support (1) and the lumbar support assembly, the front end of the guide module (4) is connected to the lumbar support assembly; the rear end of the guide module (4) is hinged to the back support (1); An elastic member, the elastic member directly or indirectly acts on the lumbar support assembly; In the initial state, the elastic member can provide elastic support force for the lumbar support assembly, so that the lumbar support assembly can remain stable at a higher position; when the lumbar support assembly is triggered under the action of a downward external force, the guide module (4) rotates downward and causes the elastic member to produce elastic deformation, and at this time the lumbar support assembly moves downward from a higher position to a lower position under the guidance of the guide module (4); when the downward external force is removed, the elastic member releases the stored deformation elastic force, and the lumbar support assembly switches from a lower position back to a higher position under the guidance of the guide module (4).

2. A waist-chasing mechanism according to claim 1, characterized in that: The front end of the guide module (4) is tilted forward and upward and is connected to the lumbar support assembly; when the lumbar support assembly is triggered by an external force, the guide module (4) rotates downward and gradually approaches a horizontal posture from an inclined posture, thereby driving the lumbar support assembly to move forward.

3. The waist-chasing mechanism according to claim 1, characterized in that: The guide module (4) comprises an upper guide member (41) and a lower guide member (42) which are arranged side by side in an upper and lower manner; the front and rear ends of the upper guide member (41) are respectively hinged to the lumbar support assembly and the back support (1), and the front and rear ends of the lower guide member (42) are respectively hinged to the lumbar support assembly and the back support (1), thereby forming a deformable four-bar linkage structure between the lumbar support assembly, the back support (1) and the guide module (4).

4. The waist-chasing mechanism according to claim 3, characterized in that: The upper guide member (41) comprises a first support arm (411) arranged symmetrically on the left and right, and the front and rear ends of the first support arm (411) are respectively hinged to the lumbar support assembly and the back support (1); the lower guide member (42) comprises a second support arm (421) arranged symmetrically on the left and right, and the front and rear ends of the second support arm (421) are respectively hinged to the lumbar support assembly and the back support (1); thereby, the guide module (4) forms two rotation support points spaced apart from each other on both left and right sides of the lumbar support assembly.

5. The waist-chasing mechanism according to claim 4, characterized in that: The length of the first support arm (411) is smaller than that of the second support arm (421); when the first support arm (411) and the second support arm (421) rotate downward, the first support arm (411) and the second support arm (421) rotate along radii of different lengths, so that the front end of the upper guide member (41) gradually approaches the lower guide member (42) and drives the lumbar support assembly to lean back.

6. The waist-chasing mechanism according to claim 3, characterized in that: The upper end of the lower guide member (42) is provided with a vertical plate (422), and the lower end of the upper guide member (41) is provided with an avoidance groove (412) opening toward the vertical plate (422), and the vertical plate (422) is located in the avoidance groove (412); when the guide module (4) rotates downward or resets upward, the vertical plate (422) moves in the avoidance groove (412) and always covers the gap formed between the upper guide member (41) and the lower guide member (42).

7. The waist-chasing mechanism according to claim 3, characterized in that: The four-link structure formed between the lumbar support assembly, the back support (1) and the guide module (4) has four hinged ends, and the elastic member is a torsion spring (3) arranged at the position of at least one hinged end.

8. The waist-chasing mechanism according to claim 3, characterized in that: An outwardly protruding limiting plate (423) is provided at the rear end of the lower guide member (42); when the lumbar support assembly moves downward to its position, the limiting plate (423) abuts against the back support (1) to limit the guide module (4) from continuing to rotate downward.

9. The waist-chasing mechanism according to claim 1, characterized in that: The lumbar support component comprises a lumbar support member (9) and a base (5), wherein the base (5) is connected to the front end of the guide module (4); the lumbar support member (9) comprises a connecting portion (91) at its rear end, wherein the lower end of the connecting portion (91) is hinged to the base (5), thereby forming a hinge point (a); an adjustment component is provided at the upper end of the connecting portion (91), wherein the adjustment component is configured to drive the upper end of the connecting portion (91) to swing in a front-to-rear direction with the hinge point (a) as the rotation center, thereby causing the lumbar support member (9) to move forward or backward.

10. The waist-chasing mechanism according to claim 9, characterized in that: The adjustment component comprises a sliding member (6) which can slide left and right, the sliding member (6) being connected to a driving member, a linkage structure being provided between the sliding member (6) and the connecting portion (91), and the driving member being able to drive the sliding member (6) to slide left and right to trigger the linkage structure, thereby causing the lumbar support member (9) to move forward or retract backward.

11. The waist-chasing mechanism according to claim 10, characterized in that: The linkage structure comprises a slide groove group arranged between the sliding member (6) and the connecting portion (91), and a slide rod assembly inserted into the slide groove group. The slide groove group comprises at least two inclined slide grooves (92) arranged at a left-right interval at the upper end of the connecting portion (91). The slide rod assembly comprises at least two parallel slide rods (64) arranged at the bottom of the sliding member (6). The slide rod (64) is slidably connected in the inclined slide groove (92). When the sliding member (6) slides, the slide rod (64) slides in the inclined slide groove (92), so that the lumbar support member (9) moves forward or backward.

12. The waist-chasing mechanism according to claim 11, characterized in that: The sliding member (6) is provided with a screw hole (61), and the axial direction of the screw hole (61) is the same as the sliding direction of the sliding member (6); the driving member is a screw rod (8) screwed into the screw hole (61), and the end of the screw rod (8) away from the sliding member (6) is connected to a handle (82), and the handle (82) can rotate in situ along its own axis under the action of an external force to drive the sliding member (6) to slide left and right.

13. The waist-chasing mechanism according to claim 12, characterized in that: The spiral rod (8) comprises an outer spiral tube (7) connected to the screw hole (61), a transmission rod (81) is passed through the outer spiral tube (7), and a handle (82) is connected to the end of the transmission rod (81); the outer spiral tube (7) comprises a transmission groove (71) inside itself, and the transmission rod (81) is passed through the transmission groove (71) to drive the outer spiral tube (7) to rotate in a circumferential direction.

14. The waist-chasing mechanism according to claim 13, characterized in that: The transmission rod (81) is rotatably connected to the left and right ends of the connecting portion (91) to prevent the slide bar (64) on the slide member (6) from escaping from the inclined slide groove (92).

15. The waist-chasing mechanism according to claim 14, characterized in that: A limiting guide rod (54) is provided between the base (5) and the sliding member (6), and the axial direction of the limiting guide rod (54) is the same as the sliding direction of the sliding member (6). The limiting guide rod (54) can guide the sliding member (6) and, together with the transmission rod (81), limit the separation of the sliding rod (64) and the inclined sliding groove (92).

16. A seat, characterized in that: It comprises a chair seat (10) and a waist-tracking mechanism as claimed in any one of claims 1 to 15, wherein the lower end of the back support (1) is rotatably connected to the rear end of the chair seat (10).

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