Tilt force adjustment mechanism and base

Abstract

The present invention discloses a tilting force adjustment mechanism, including a bottom shell, a mounting boss is arranged inside the bottom shell, a pressure cover is arranged on the mounting boss, a mounting cylinder can be slidably arranged in the mounting boss, an elastic member is arranged between the mounting cylinder and the pressure cover, an adjustment rod can be slidably arranged in the bottom shell, a transmission assembly is connected between the adjustment rod and the mounting cylinder, the bottom shell is rotatably connected to a chair back frame, a pressure rod is arranged on the chair back frame, one end of an elastic plate is fixedly connected to the bottom shell, the other end abuts against the bottom of the pressure rod, and the middle of the elastic plate is slidably connected to the adjustment rod. The present invention acts on the bottom shell through the gravity of the human body, and the bottom shell moves downward relative to the mounting cylinder. Under the action of the transmission assembly, the adjustment rod is pulled to change the position of the adjustment rod supporting the elastic plate, and the supporting force of the elastic plate on the pressure rod is adjusted, thereby realizing automatic adjustment of the backrest tilting force according to the gravity of the human body, without the need for manual multiple adjustments, and the operation is convenient, efficient, and highly flexible.

Description

Technical Field

[0001] The invention relates to the technical field of seat accessories, and in particular to a tilting force adjustment mechanism and a seat. Background Art

[0002] Currently, many chair backs on the market have a reclining function, and the backrests provide a constant reclining force. However, since users of different body shapes have different requirements for the reclining force of the backrest, smaller users feel that the reclining force of the backrest is too large and it is difficult to achieve reclining, while larger users feel that the reclining force of the backrest is too small and the reclining angle is too large. Therefore, some chairs can adjust the reclining force of the backrest by adding an adjustment control lever to the chassis. However, this type of design uses manual adjustment, and the user needs to adjust it multiple times to get the appropriate reclining force. The operation is cumbersome. When different users use the same chair, they need to readjust it each time they use it, which is very inconvenient. Summary of the invention

[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a tilting force adjustment mechanism which can automatically adjust the tilting force of a backrest.

[0004] The present invention also provides a base having the above-mentioned tilt force adjustment mechanism.

[0005] According to the first aspect of the present invention, the tilt force adjustment mechanism includes a bottom shell, a mounting tube, an adjustment rod, a seat back frame and an elastic plate, a mounting boss is arranged inside the bottom shell, a pressure cover is arranged on the mounting boss, the mounting tube can be slidably arranged in the mounting boss, the mounting tube is arranged along the height direction of the bottom shell, an elastic member is arranged between the mounting tube and the pressure cover, the adjustment rod can be slidably arranged in the bottom shell, the adjustment rod is arranged along the width direction of the bottom shell, a transmission assembly is connected between the adjustment rod and the mounting tube, the bottom shell is rotatably connected to the seat back frame, the seat back frame is provided with a pressure rod, one end of the elastic plate is fixedly connected to the bottom shell, and the other end abuts against the bottom of the pressure rod, and the middle part of the elastic plate is slidably connected to the adjustment rod.

[0006] The tilt force adjustment mechanism according to the embodiment of the present invention has at least the following technical effects: when a person sits on the chair seat, the tilt of the backrest drives the chair back frame to rotate, the pressure rod applies pressure to the elastic plate, the body weight acts on the bottom shell through the pressure cover, and the bottom shell moves downward relative to the mounting tube. Under the action of the transmission assembly, the adjustment rod is pulled to change the position of the elastic plate supported by the adjustment rod, and the supporting force of the elastic plate on the pressure rod is adjusted to automatically reach a balance with the pressure of the pressure rod, thereby realizing automatic adjustment of the backrest tilt force according to the body weight, without the need for multiple manual adjustments, and the operation is convenient, efficient and flexible to use.

[0007] According to some embodiments of the present invention, the transmission assembly includes an L-shaped connecting rod and a first connecting rod, the bottom shell is provided with a support rod, the middle portion of the L-shaped connecting rod is rotatably connected to the support rod, and the two ends of the L-shaped connecting rod are rotatably connected to the installation tube and the first connecting rod respectively. When the bottom shell is subjected to the weight of the human body and moves downward relative to the installation tube, the support rod pulls the L-shaped connecting rod, the L-shaped connecting rod rotates, and the adjusting rod is pulled through the first connecting rod, thereby changing the position of the adjusting rod supported on the bottom of the elastic plate, converting the movement in the vertical direction into the movement in the horizontal direction, and the transmission is reliable and efficient.

[0008] According to some embodiments of the present invention, the outer wall of the mounting tube is provided with a mounting lug, the mounting lug passes through the mounting boss, and is rotatably connected to the L-shaped connecting rod. When the supporting rod moves downward relative to the mounting tube together with the bottom shell, the supporting rod pulls the L-shaped connecting rod, which is connected to the mounting lug of the mounting tube through the L-shaped connecting rod, and the L-shaped connecting rod rotates around the end connected to the mounting lug as the center, thereby realizing transmission and conversion between vertical movement and horizontal movement.

[0009] According to some embodiments of the present invention, guide blocks are provided on both sides of the bottom shell, and an adjusting roller is provided on the adjusting rod, and the adjusting roller is slidably connected to the top surface of the guiding block. When the transmission assembly pulls the adjusting rod, the adjusting roller rolls to reduce friction, and the adjusting rod can slide smoothly on the top surface of the guiding block, thereby ensuring reliable adjustment of the adjusting rod.

[0010] According to some embodiments of the present invention, a supporting roller is provided on the top of the adjusting rod, and the supporting roller is slidably connected to the bottom of the elastic plate. The supporting roller is slidably connected to the bottom of the elastic plate, so that the friction between the adjusting rod and the elastic plate is reduced, ensuring smooth movement of the adjusting rod and reliable adjustment.

[0011] According to some embodiments of the present invention, the seat back frame is provided with limit holes on both sides, and the bottom shell is provided with convex columns on both sides, and the convex columns are inserted into the limit holes. When the seat back frame rotates, the convex columns move in the limit holes, and the convex columns cooperate with the limit holes to limit the rotation range of the seat back frame, thereby ensuring reliable rotation of the seat back frame.

[0012] According to some embodiments of the present invention, the tilt force adjustment mechanism further includes a seat frame, one end of which is rotatably connected to the seat back frame, and the other end of which is rotatably connected to a second connecting rod, and the other end of which is rotatably connected to the bottom shell. When a human body leans on the backrest, the seat back frame rotates, and the seat frame is rotatably connected to the seat back frame and the bottom shell respectively, so that the seat frame moves synchronously with the rotation of the seat back frame, so that the user can adjust to a suitable sitting posture.

[0013] According to some embodiments of the present invention, a support rod is fixedly inserted at the lower part of the installation tube, and a limit swing rod is rotatably arranged in the installation tube, one end of the limit swing rod abuts against the top end of the support rod, and the other end is passed through the installation tube and abuts against the installation boss. When the user leaves the seat, the bottom shell moves upward relative to the installation tube, and the two ends of the limit swing rod abut against the support rod and the installation boss respectively, limiting the movement range of the bottom shell, preventing the bottom shell from escaping upward from the support rod and causing the seat to fail, thereby ensuring safety and reliability in use.

[0014] According to some embodiments of the present invention, a wear-resistant sleeve is provided between the mounting cylinder and the mounting boss. By providing the wear-resistant sleeve, wear between the mounting cylinder and the mounting boss due to long-term friction is avoided, which is conducive to extending the service life of the parts.

[0015] The base according to the second aspect of the present invention comprises the tilt force adjustment mechanism of the first aspect.

[0016] The base according to the embodiment of the present invention has at least the following technical effects: by adopting the above-mentioned tilting force adjustment mechanism, the tilting force of the backrest can be automatically adjusted according to the weight of different users without manual adjustment, and the operation is convenient and efficient, and the use flexibility is high.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 is a structural schematic diagram of a tilt force adjustment mechanism according to an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 The structural exploded view of the tilt force adjustment mechanism shown in ;

[0021] Figure 3 yes Figure 1 A cross-sectional view of the tilt force adjustment mechanism shown in ;

[0022] Figure 4 yes Figure 1 The structural schematic diagram of the adjusting rod shown in;

[0023] Figure 5 It is a schematic structural diagram of a base according to an embodiment of the present invention.

[0024] Reference numerals:

[0025] Bottom shell 100, mounting boss 101, support rod 102, boss 103, gland 110, mounting tube 120, mounting lug 121, elastic member 130, wear-resistant sleeve 140, guide block 150, limit swing rod 160,

[0026] L-shaped connecting rod 200, driving arm 201, driven arm 202, first connecting rod 210, adjusting rod 220, adjusting roller 221, supporting roller 222,

[0027] The backrest frame 300, the pressure rod 310, the cover 320, the limiting ring 321, the limiting hole 330,

[0028] Elastic plate 400,

[0029] Seat frame 500, second connecting rod 510,

[0030] Support rod 600 , support foot 610 , universal wheel 620 . DETAILED DESCRIPTION

[0031] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are 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, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] Reference below Figures 1 to 5 The tilt force adjustment mechanism and the base according to the embodiment of the present invention are described.

[0036] like Figures 1 to 3 As shown, the tilting force adjustment mechanism according to the first embodiment of the present invention includes a bottom shell 100, a mounting tube 120, an adjustment rod 220 and an elastic plate 400, a mounting boss 101 is arranged inside the bottom shell 100, a pressure cover 110 is arranged on the mounting boss 101, and the pressure cover 110 is connected to the seat, the mounting tube 120 can be slidably arranged in the mounting boss 101, the mounting tube 120 is arranged along the height direction of the bottom shell 100, and an elastic member 130 is arranged between the mounting tube 120 and the pressure cover 110, and the adjustment The rod 220 can be slidably arranged in the bottom shell 100, and the adjusting rod 220 is arranged along the width direction of the bottom shell 100. A transmission assembly is connected between the adjusting rod 220 and the mounting tube 120. The bottom shell 100 is rotatably connected to the seat back frame 300. The seat back frame 300 is provided with a pressure rod 310. An elastic plate 400 is connected between the pressure rod 310 and the bottom shell 100. One end of the elastic plate 400 is fixedly connected to the bottom shell 100, and the other end abuts against the bottom of the pressure rod 310. The middle part of the elastic plate 400 is slidably connected to the adjusting rod 220.

[0037] Specifically, Figure 2 and Figure 3 As shown, the mounting boss 101 is integrally arranged with the bottom shell 100, and the mounting boss 101 is opened at the top and the bottom to form a mounting cavity inside. The pressure cover 110 and the mounting boss 101 are fastened together by screws. A storage cavity is arranged at the upper part of the mounting cylinder 120, and a positioning boss is arranged at the bottom of the storage cavity. The elastic member 130 is arranged as a compression spring, and both ends of the compression spring are respectively abutted against the pressure cover 110 and the mounting cylinder 120. The lower part of the compression spring is installed in the storage cavity and is sleeved on the positioning boss to facilitate reliable positioning and installation of the compression spring.

[0038] It can be understood that one end of the elastic plate 400 abuts against the bottom of the pressure rod 310, and the pressure rod 310 applies downward pressure to the elastic plate 400 as the seat back frame 300 rotates. The other end of the elastic plate 400 is fixedly connected to an end of the bottom shell 100 away from the seat back frame 300. The adjustment rod 220 is supported in the middle of the elastic plate 400, which is equivalent to a fulcrum, and the adjustment rod 220 can slide relative to the elastic plate 400 to change the position of the fulcrum. When the user sits on the seat and leans on the backrest, the backrest tilts and drives the seat back frame 300 to rotate, and the pressure rod 310 applies downward pressure to the elastic plate 400. At the same time, the seat and the mounting boss 101 are connected through the pressure cover 110, and the body's gravity acts on the bottom shell 100. The bottom shell 100 moves downward relative to the mounting tube 120, and the compression spring is compressed. Under the action of the transmission assembly, the adjustment rod 220 is pulled, and the adjustment rod 220 slides relative to the elastic plate 400 and moves toward the pressure rod 310, thereby changing the position of the adjustment rod 220 supporting the elastic plate 400 to adjust the supporting force of the elastic plate 400 on the pressure rod 310, so as to automatically achieve a balance with the pressure of the pressure rod 310 on the elastic plate 400, thereby realizing automatic adjustment of the backrest tilting force according to the size of the body's gravity, without the need for manual multiple adjustments, and the operation is convenient, efficient, and flexible to use.

[0039] There are two pressure rods 310, and correspondingly, there are two elastic plates 400. The two pressure rods 310 are respectively arranged on both sides of the inner wall of the seat back frame 300. A sheath 320 is sleeved on the pressure rod 310. The sheath 320 can rotate with the pressure rod 310 as the axis. Limiting rings 321 are arranged at both ends of the sheath 320, and the elastic plate 400 is installed between the limiting rings 321 at both ends. When the pressure rod 310 moves downward with the rotation of the seat back frame 300, the pressure rod 310 moves on the elastic plate 400, and the sheath 320 prevents the wear between the pressure rod 310 and the elastic plate 400, and the limiting ring 321 limits the position of the elastic plate 400 to prevent the elastic plate 400 from shifting and causing failure.

[0040] like Figure 1 and Figure 2 As shown, in some specific embodiments of the present invention, the seat back frame 300 is provided with limiting holes 330 on both sides, and the bottom shell 100 is provided with bosses 103 on both sides, and the bosses 103 are penetrated through the limiting holes 330. Specifically, the limiting holes 330 are arc-shaped holes. When the seat back frame 300 rotates, the bosses 103 move in the limiting holes 330. The bosses 103 cooperate with the limiting holes 330 to limit the rotation range of the seat back frame 300, thereby ensuring that the seat back frame 300 rotates reliably.

[0041] like Figure 2 and Figure 3As shown, in some specific embodiments of the present invention, a wear-resistant sleeve 140 is provided between the mounting cylinder 120 and the mounting boss 101. When the user sits down or stands up, the bottom shell 100 moves downward or upward relative to the mounting cylinder 120, and friction is generated between the bottom shell 100 and the mounting cylinder 120. By installing the wear-resistant sleeve 140, wear between the mounting cylinder 120 and the mounting boss 101 due to long-term friction can be avoided, which is conducive to extending the service life of the parts.

[0042] In some specific embodiments of the present invention, the transmission assembly includes an L-shaped connecting rod 200 and a first connecting rod 210, the bottom shell 100 is provided with a support rod 102, the middle portion of the L-shaped connecting rod 200 is rotatably connected to the support rod 102, and the two ends of the L-shaped connecting rod 200 are respectively rotatably connected to the mounting cylinder 120 and the first connecting rod 210. Further, the outer wall of the mounting cylinder 120 is extended to be provided with a mounting lug 121, the mounting lug 121 passes through the mounting boss 101, and is rotatably connected to the L-shaped connecting rod 200.

[0043] Specifically, the support rod 102 is arranged between the mounting boss 101 and the adjustment rod 220, and the support rod 102, the mounting boss 101 and the bottom shell 100 are all integrally arranged, the L-shaped connecting rod 200 includes a driving arm 201 and a driven arm 202, the driving arm 201 and the driven arm 202 are rotatably connected to the support rod 102 at the junction, the driving arm 201 is rotatably connected to the mounting ear 121 of the mounting cylinder 120, and the mounting ear 121 is provided with two. Accordingly, the L-shaped connecting rod 200 There are also two mounting ears 121 on the mounting tube 120 facing away from the seat back frame 300 and extending toward the support rod 102. The mounting boss 101 and the wear-resistant sleeve 140 are both provided with a clearance groove, so that the mounting ears 121 can pass through the mounting boss 101 and be connected to the L-shaped connecting rod 200. The driven arm 202 of the L-shaped connecting rod 200 is rotatably connected to the first connecting rod 210, and the first connecting rod 210 is rotatably connected to the adjusting shaft.

[0044] It can be understood that when the bottom shell 100 is acted upon by the weight of the human body and moves downward relative to the mounting tube 120, the support rod 102 pulls the L-shaped connecting rod 200, and the driving arm 201 of the L-shaped connecting rod 200 rotates around the connection end between the driving arm 201 and the mounting support ear 121, and the driven arm 202 rotates around the connection end between the driven arm 202 and the support rod 102, and the adjusting rod 220 is pulled by the first connecting rod 210, and the adjusting rod 220 moves toward the seat back frame 300, thereby changing the position of the adjusting rod 220 supported at the bottom of the elastic plate 400, converting the vertical movement into the horizontal movement, and the transmission is reliable and efficient.

[0045] like Figure 2 and Figure 4As shown, in some specific embodiments of the present invention, guide blocks 150 are provided on both sides of the bottom shell 100, and an adjusting roller 221 is provided on the adjusting rod 220, and the adjusting roller 221 is connected to the top surface of the guide block 150. Further, a supporting roller 222 is provided on the top of the adjusting rod 220, and the supporting roller 222 is slidably connected to the bottom of the elastic plate 400.

[0046] Specifically, the top surface of the guide block 150 is inclined, and is inclined upward from one end facing away from the mounting boss 101 to the other end. When the adjusting rod 220 is pulled, the adjusting rod 220 moves between the guide block 150 and the elastic plate 400 toward the mounting boss 101, and the adjusting rod 220 gradually moves upward, so that its supporting force on the elastic plate 400 is gradually increased, thereby increasing the supporting force of the elastic plate 400 on the pressure rod 310, and then the backrest can have a greater tilting force. Under the action of the adjusting roller 221 and the supporting roller 222, the sliding friction is converted into rolling friction, reducing the friction, so that the adjusting rod 220 can move smoothly between the guide block 150 and the elastic plate 400, ensuring reliable adjustment.

[0047] In some specific embodiments of the present invention, a support rod 600 is fixedly inserted into the lower part of the mounting tube 120, and a limit rocker arm 160 is rotatably arranged in the mounting tube 120. One end of the limit rocker arm 160 abuts against the top end of the support rod 600, and the other end passes through the mounting tube 120 and abuts against the mounting boss 101.

[0048] Specifically, a through slot with a top opening is provided on the side of the mounting boss 101 facing the seat back frame 300, one end of the limiting rocker arm 160 is inserted into the mounting tube 120 and abuts against the top end of the support rod 600, and the other end of the limiting rocker arm 160 is inserted into the through slot and abuts against the bottom end of the through slot. When the user stands up and the bottom shell 100 moves upward relative to the mounting tube 120, the two ends of the limiting rocker arm 160 abut against the support rod 600 and the mounting boss 101 respectively, limiting the movement range of the bottom shell 100, preventing the bottom shell 100 from slipping out of the support rod 600 upward and causing the seat to fail, thereby ensuring safety and reliability of use.

[0049] In addition, the tilting force adjustment mechanism also includes a seat frame 500, the top of the seat frame 500 is connected to the seat, one end of the seat frame 500 is rotatably connected to the seat back frame 300, and the other end is rotatably connected to the second connecting rod 510, and the other end of the second connecting rod 510 is rotatably connected to the bottom shell 100. When the user leans on the backrest, the seat back frame 300 rotates, driving the seat frame 500 to move, so that the user can adjust to a suitable sitting posture.

[0050] like Figure 5As shown, the base according to the second embodiment of the present invention includes the tilt adjustment mechanism of the first embodiment, and further, a plurality of legs 610 are connected to the support rod 600, and each leg 610 is provided with a universal wheel 620. It can be understood that by adopting the above-mentioned tilt force adjustment mechanism, the tilt force of the backrest can be automatically adjusted according to the weight of different users, without manual adjustment, and the operation is convenient, efficient, and flexible to use.

[0051] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A tilt force adjustment mechanism, characterized in that: include: A bottom shell, wherein a mounting boss is provided inside, and a pressure cover is provided on the mounting boss; A mounting tube, slidably disposed in the mounting boss, the mounting tube is disposed along the height direction of the bottom shell, and an elastic member is disposed between the mounting tube and the gland; An adjusting rod is slidably disposed in the bottom shell, the adjusting rod is disposed along the width direction of the bottom shell, and a transmission assembly is connected between the adjusting rod and the mounting tube; A seat back frame, rotatably connected to the bottom shell, the seat back frame being provided with a pressure rod; An elastic plate, one end of which is fixedly connected to the bottom shell, and the other end of which is in contact with the bottom of the pressure rod, and the middle part of the elastic plate is slidably connected to the adjustment rod; The transmission assembly includes an L-shaped connecting rod and a first connecting rod, the bottom shell is provided with a supporting rod, the middle portion of the L-shaped connecting rod is rotatably connected to the supporting rod, and the two ends of the L-shaped connecting rod are rotatably connected to the mounting tube and the first connecting rod respectively; The outer wall of the mounting tube is provided with a mounting lug, the mounting lug passes through the mounting boss and is rotatably connected to the L-shaped connecting rod; Guide blocks are arranged on both sides of the bottom shell, and an adjusting roller is arranged on the adjusting rod, and the adjusting roller is slidably connected to the top surface of the guide block; A support rod is fixedly inserted at the lower part of the installation tube, and a limit swing rod is rotatably arranged in the installation tube. One end of the limit swing rod abuts against the top end of the support rod, and the other end passes through the installation tube and abuts against the installation boss.

2. The tilt force adjustment mechanism according to claim 1, characterized in that: A supporting roller is arranged on the top of the adjusting rod, and the supporting roller is slidably connected with the bottom of the elastic plate.

3. The tilt force adjustment mechanism according to claim 1, characterized in that: Limiting holes are arranged on both sides of the chair back frame, and convex columns are arranged on both sides of the bottom shell, and the convex columns are penetrated through the limiting holes.

4. The tilt force adjustment mechanism according to claim 1, characterized in that: The tilting force adjustment mechanism also includes a seat frame, one end of which is rotatably connected to the seat back frame, and the other end of which is rotatably connected to a second connecting rod, and the other end of which is rotatably connected to the bottom shell.

5. The tilt force adjustment mechanism according to claim 1, characterized in that: A wear-resistant sleeve is arranged between the mounting cylinder and the mounting boss.

6. A base, characterized in that: It comprises a tilt force adjustment mechanism according to any one of claims 1 to 5.

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