Waist support adjusting mechanism

Abstract

The invention discloses a waist support adjusting mechanism which comprises a waist support, a waist support mounting plate, a fixed mounting plate, a springing waist adjusting element and a locking switch box. The waist support is mounted on the surface of the waist support mounting plate, the springing waist adjusting element is located on the surface of the fixed mounting plate, and the locking switch box controls and adjusts the springing waist adjusting element through the drive-by-wire pull wire, so that the rotating angle of the waist support mounting plate is adjusted, and the waist support is locked; the springing waist adjusting element comprises a waist adjusting base, a waist adjusting upper cover, a pin shaft, a double-torsion spring and an adjusting plate, one end of the double-torsion spring is connected with the waist adjusting base, the other end of the double-torsion spring is in sliding contact with the waist support mounting plate, the waist support mounting plate is kept in an outward springing state, and the waist following effect of the waist support is achieved; through linkage of the double torsion springs and the adjusting plate, the waist support can automatically bounce and be locked along with the pressure of the waist of the user, the requirements of different sitting postures and body types are met, and the waist comfort degree is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of seats, and specifically to a lumbar support adjusting mechanism. Background Art

[0002] Currently, ergonomic seats are widely favored by people. They not only make users sit comfortably and relieve fatigue, but also have a certain positive effect on the development of human bones and the prevention of lumbar disc herniation.

[0003] However, most office chairs on the market at present only have a slightly protruding part at the waist compared to the back for lumbar support. This design often fails to achieve the support effect, making the designed lumbar support like a decoration. Moreover, for the lumbar support adjusting mechanisms on the market, their adjustment height is limited, and people must rely on a fixed posture to support the waist. This is not only very inconvenient to operate, and users need to adjust multiple times to reach a suitable angle for themselves. Moreover, once adjusted too prominently, the effect will be counterproductive and it will not be comfortable to use. Therefore, it is particularly important for office workers to have an office chair backrest that can play a supporting role and can be adjusted adaptively. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention discloses a lumbar support adjusting mechanism to solve the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A lumbar support adjusting mechanism, including a lumbar support, a lumbar support mounting plate, a fixed mounting plate, a spring-loaded lumbar adjustment element, and a locking switch box; the lumbar support is mounted on the surface of the lumbar support mounting plate, the spring-loaded lumbar adjustment element is located on the surface of the fixed mounting plate, and the locking switch box controls and adjusts the spring-loaded lumbar adjustment element through a provided wire control cable, thereby adjusting the rotation angle of the lumbar support mounting plate and the locking of the lumbar support.

[0006] The bouncing lumbar adjustment element includes a lumbar adjustment base, a lumbar adjustment upper cover, a flat head grooved pin shaft, a double torsion spring, and an adjustment plate. The lumbar adjustment base is installed on the surface of the fixed mounting plate. The lumbar adjustment upper cover is snap-fitted with the lumbar adjustment base. The pin shaft is installed at the upper end of the lumbar adjustment base. An opening snap ring is provided on one side of the pin shaft to limit the axial position of the pin shaft. The tail end of the lumbar support mounting plate is sleeved with the pin shaft, and the lumbar support mounting plate rotates around the pin shaft. The double torsion spring is sleeved on the outer wall of the pin shaft, and one end of the double torsion spring is fixedly connected to a fixed seat provided in the lumbar adjustment base. The other end of the double torsion spring is in sliding contact with the inner wall surface of the tail end of the lumbar support mounting plate, so that the lumbar support mounting plate maintains an outward bouncing state, realizing the effect of the lumbar support chasing the waist. The adjustment plate is located at the lower end of the lumbar adjustment base, and a rotating shaft provided at the tail end of the adjustment plate is rotatably connected to a rotating seat provided in the lumbar adjustment base. A notch is provided at the front end of the lumbar support mounting plate, and the front end of the adjustment plate is inserted into the notch. By controlling the rotation of the adjustment plate, the bouncing height of the lumbar support mounting plate is adjusted, and then the locking of the bouncing height of the lumbar support is realized.

[0007] Preferably, the connection between the lumbar support mounting plate and the pin shaft is connected by a sleeve provided.

[0008] Preferably, a limit rubber block is provided at the upper end of the lumbar adjustment base, which cooperates with a limit plate provided at the tail end of the lumbar support mounting plate to limit the maximum angle position of the lumbar support mounting plate when it is lifted.

[0009] Preferably, a shock-absorbing block is provided inside the notch.

[0010] Preferably, a gear shaft assembly is provided on one side of the tail end of the adjustment plate. The gear shaft assembly includes a gear and a locking gear block. The gear is located on one side of the rotating shaft, and the gear is fixedly connected to the rotating shaft and rotates synchronously with it. A sliding groove is provided on one side inside the lumbar adjustment base. The locking gear block is located in the sliding groove, and the locking gear block slides smoothly inside the sliding groove. When the locking gear block engages with the gear, the rotating shaft and the push plate are in a locked state. Otherwise, the rotating shaft and the push plate rotate freely.

[0011] Preferably, a compression spring is provided inside the sliding groove, and the compression spring is connected to the back side of the locking gear block to squeeze and push the locking gear block to move towards the gear. A clamping block is provided inside the locking gear block, and the clamping block engages with the locking gear block. The clamping block is connected to a wire control cable, and the wire control cable passes through the compression spring and is connected to an external locking switch box. By pulling the locking gear block to move through the wire control cable, the locking gear block is separated from the gear, and then the function of the lumbar support chasing the waist is realized.

[0012] Preferably, the locking switch box includes a locking switch bottom case, a locking switch upper cover, a handwheel, a limit wheel and a limit block. The locking switch bottom case and the locking switch upper cover are snap-fitted together. A handwheel shaft is provided at the lower end of the handwheel. The lower end of the handwheel shaft is inserted into the interior of the locking switch bottom case from the locking switch upper cover. The limit wheel is located inside the locking switch bottom case. The lower end of the handwheel shaft is connected to the limit wheel by a pin provided. One side of the limit wheel is connected to the wire control cable. By rotating the handwheel, the limit wheel is driven to engage with the limit block provided inside the locking switch bottom case to reach the locking position. At this time, the wire control cable pulls the locking gear block and the gear to separate from each other.

[0013] Preferably, a slot is provided on the side wall at the lower end of the lumbar adjustment base, and a jack is provided on one side at the front end of the lumbar support mounting plate. The jack and the slot are cooperatively inserted with each other through a mounting pin provided, which is used to overcome the torsion of the double torsion spring and facilitate the assembly of the temporary components of the lumbar support mounting plate, the gear shaft assembly and the shock absorber block, and is removed after the entire backrest assembly is completed.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. In the present invention, through the linkage design of the double torsion spring and the adjustment plate, the lumbar support can automatically bounce up and fit with the pressure of the user's waist, and can dynamically follow the waist in real time when the human body makes a movement, so that the waist obtains a certain support, realizes dynamic follow-up support, adapts to different sitting postures and body type requirements, and improves the comfort of the waist.

[0016] 2. In the present invention, a wire control cable combined with a gear locking structure is adopted. The user can quickly switch the locking state by rotating the handwheel, freely choose dynamic waist following or static fixed support, and has a large stroke and multi-stage locking function, which can meet the strong support of the waist in different postures and meet the needs of diversified use scenarios.

[0017] 3. In the present invention, through the synergistic effect of the limit rubber block, the shock absorber pad and the shock absorber block, the mechanical impact brought by the waist pressure is effectively buffered, the component wear and running noise are reduced. At the same time, the sleeve and snap ring design ensures the rotation stability and prolongs the service life of the mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention.

[0019] In the drawings:

[0020] Figure 1 is a schematic structural view of the overall lumbar support adjustment mechanism of the present invention;

[0021] Figure 2 is a side view of the lumbar support adjustment mechanism of the present invention.

[0022] Figure 3 is a schematic structural view of the elastic lumbar adjustment element of the present invention;

[0023] Figure 4 is a schematic internal structural view of the elastic lumbar adjustment element of the present invention;

[0024] Figure 5 is a schematic structural view of one perspective of the lumbar support mounting plate of the present invention;

[0025] Figure 6 is a schematic structural view of the assembly of the double torsion spring and the pin shaft of the present invention;

[0026] Figure 7 is a schematic structural view of the gear shaft assembly of the present invention;

[0027] Figure 8 is a schematic internal structural view of the locking gear block of the present invention;

[0028] Figure 9 is a schematic internal structural view of the locking switch box of the present invention;

[0029] Reference numerals in the figure: 1, lumbar support; 2, lumbar support mounting plate; 201, notch; 202, bushing; 3, fixed mounting plate; 401, lumbar adjustment base; 402, upper lumbar adjustment cover; 403, pin shaft; 404, double torsion spring; 405, adjusting plate; 406, snap ring; 407, fixed seat; 408, rotating shaft; 409, rotating seat; 410, limiting rubber block; 411, limiting plate; 412, shock absorber block; 413, slot; 414, jack; 415, mounting pin; 5, locking switch box; 501, locking switch bottom case; 502, locking switch upper cover; 503, handwheel; 504, limiting wheel; 505, limiting block; 506, handwheel shaft; 507, pin; 601, gear; 602, locking gear block; 603, sliding groove; 604, compression spring; 605, clamping block; 7, wire control cable; 8, shock absorber pad. Detailed implementation manners

[0030] The following is a description of the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not used to limit the present invention.

[0031] Embodiment: As Figures 1-9As shown in the figure, a lumbar support adjustment mechanism includes a lumbar support 1, a lumbar support mounting plate 2, a fixed mounting plate 3, a spring-loaded lumbar adjustment element, and a locking switch box 5; the lumbar support 1 is mounted on the surface of the lumbar support mounting plate 2, the fixed mounting plate 3 is mounted on the backrest of the chair, the spring-loaded lumbar adjustment element is located on the surface of the fixed mounting plate 3, and the locking switch box 5 controls and adjusts the spring-loaded lumbar adjustment element through a provided wire control cable 7, thereby adjusting the rotation angle of the lumbar support mounting plate 2 and the locking of the lumbar support 1.

[0032] Among them, as Figures 2-6 shown, the spring-loaded lumbar adjustment element includes a lumbar adjustment base 401, a lumbar adjustment upper cover 402, a flat head grooved pin 403, a double torsion spring 404, and an adjustment plate 405. The lumbar adjustment base 401 is mounted on the surface of the fixed mounting plate 3, the lumbar adjustment upper cover 402 is snap-fitted with the lumbar adjustment base 401, and shock pads 8 are respectively provided on the lower end surface of the lumbar adjustment upper cover 402 for shock absorption between the lumbar support mounting plate 2 and the lumbar adjustment upper cover 402; the pin 403 is mounted on the upper end of the lumbar adjustment base 401, an open retaining ring 406 is provided on one side of the pin 403 for limiting the axial position of the pin 403, the tail end of the lumbar support mounting plate 2 is sleeved with the pin 403, and the connection between the lumbar support mounting plate 2 and the pin 403 is connected through a provided bushing 202. The lumbar support mounting plate 2 rotates around the pin 403. Among them, a limit rubber block 410 is provided at the upper end of the lumbar adjustment base 401, which cooperates with a limit plate 411 provided at the tail end of the lumbar support mounting plate 2 to limit the maximum angle position of the lumbar support mounting plate 2 when it is lifted to prevent it from being lifted too high; the double torsion spring 404 is sleeved on the outer wall of the pin 403, and one end of the double torsion spring 404 is fixedly connected to a fixed seat 407 provided inside the lumbar adjustment base 401, and the other end of the double torsion spring 404 is in sliding contact with the inner wall surface of the tail end of the lumbar support mounting plate 2, so that the lumbar support mounting plate 2 maintains an outward springing state to achieve the effect of the lumbar support 1 following the waist. The adjustment plate 405 is located at the lower end of the lumbar adjustment base 401, and a rotating shaft 408 provided at the tail end of the adjustment plate 405 is rotatably connected to a rotating seat 409 provided inside the lumbar adjustment base 401. A notch 201 is provided at the front end of the lumbar support mounting plate 2, the front end of the adjustment plate 405 is inserted into the notch 201, and a shock-absorbing block 412 is provided inside the notch 201. The adjustment plate 405 contacts the shock-absorbing block 412 for shock absorption treatment. By controlling the rotation of the adjustment plate 405, the springing height of the lumbar support mounting plate 2 is adjusted, and thus the springing height of the lumbar support 1 is locked.

[0033] Furthermore, as Figure 7 and Figure 8As shown in the figure, a gear shaft assembly is provided on one side of the tail end of the adjusting plate 405. The gear shaft assembly includes a gear 601 and a locking gear block 602. The gear 601 is located on one side of the rotating shaft 408, and the gear 601 is fixedly connected to the rotating shaft 408, and the two rotate synchronously. On one side inside the lumbar adjustment base 401, there is a sliding groove 603. The locking gear block 602 is located in the sliding groove 603, and the locking gear block 602 slides smoothly inside the sliding groove 603. When the locking gear block 602 engages with the gear 601, the rotating shaft 408 and the pushing plate are in a locked state. Otherwise, the rotating shaft 408 and the pushing plate rotate freely; inside the sliding groove 603, there is a compression spring 604, and the compression spring 604 is connected to the back side of the locking gear block 602, which is used to squeeze and push the locking gear block 602 to move towards the gear 601. Inside the locking gear block 602, there is a latch 605. The latch 605 engages with the locking gear block 602, and the latch 605 is connected to the wire-controlled cable 7. The wire-controlled cable 7 passes through the compression spring 604 and is connected to the external locking switch box 5. By pulling the locking gear block 602 to move through the wire-controlled cable 7, the locking gear block 602 is separated from the gear 601, thereby enabling the lumbar support 1 to achieve the function of following the waist.

[0034] Furthermore, as Figure 5 shown, on the lower side wall of the lumbar adjustment base 401, there is a slot 413. On one side of the front end of the lumbar support mounting plate 2, there is a socket 414. The socket 414 and the slot 413 are inserted and fitted with each other through the provided mounting pin 415, which is used to overcome the torsion of the double torsion spring 404 and facilitate the assembly of the temporary components of the lumbar support mounting plate 2, the gear shaft assembly, and the shock absorber block 412, and is removed after the entire backrest assembly is completed.

[0035] Among them, as Figure 9 shown, the locking switch box 5 includes a locking switch bottom case 501, a locking switch upper cover 502, a handwheel 503, a limit wheel 504, and a limit block 505. The locking switch bottom case 501 and the locking switch upper cover 502 are snap-fitted and assembled. The lower end of the handwheel 503 is provided with a handwheel shaft 506. The lower end of the handwheel shaft 506 is inserted into the inside of the locking switch bottom case 501 from the locking switch upper cover 502. The limit wheel 504 is located inside the locking switch bottom case 501. The lower end of the handwheel shaft 506 is connected to the limit wheel 504 through the provided pin 507. One side of the limit wheel 504 is connected to the wire-controlled cable 7. By rotating the handwheel 503, the limit wheel 504 is driven to engage with the limit block 505 provided inside the locking switch bottom case 501. In this embodiment, when the handwheel 503 is twisted by an angle of 50°, the locking position can be reached; at this time, the wire-controlled cable 7 pulls the locking gear block 602 to be separated from the gear 601.

[0036] Specific working principle:

[0037] First, install the overall mechanism on the required seat back through the fixed mounting plate 3. Then, fix the lumbar support 1 on the lumbar support mounting plate 2. Turn the handwheel 503 to make the locking switch box 5 in the locked state. Use the wire control cable 7 to pull the locking gear block 602 along the slideway groove away from the gear 601. The gear 601 and the locking gear block 602 are separated from each other, and the gear 601 and the adjusting plate 405 can rotate freely. At this time, the torsion spring in the elastic lumbar adjustment element can bounce the lumbar support 1 to the maximum limit position. When the lumbar support 1 receives the leaning force of the user, at this time, the lumbar support 1 will move closely against the user's waist to achieve the purpose of following the waist.

[0038] When the user needs fixed support during the process of following the waist, turn the handwheel 503 to make the locking switch box 5 in the unlocked state. At this time, the wire control cable 7 will no longer pull the locking gear block 602. Under the action of the compression spring 604, the locking gear block 602 will move along the slideway groove towards the gear 601 and engage with the gear 601, that is, the adjusting plate 405 will be locked. At this time, the bouncing height of the lumbar support 1 will be locked to achieve the locking effect of the lumbar support 1.

[0039] Finally, it should be noted that the above are only preferred examples of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A lumbar support adjusting mechanism, characterized in that: It includes a lumbar support, a lumbar support mounting plate, a fixed mounting plate, a spring-loaded lumbar adjustment element, and a locking switch box; the lumbar support is mounted on the surface of the lumbar support mounting plate, the spring-loaded lumbar adjustment element is located on the surface of the fixed mounting plate, and the locking switch box controls and adjusts the spring-loaded lumbar adjustment element through a provided wire control cable, thereby adjusting the rotation angle of the lumbar support mounting plate and the locking of the lumbar support. The spring-loaded lumbar adjustment element includes a lumbar adjustment base, a lumbar adjustment upper cover, a pin shaft, a double torsion spring, and an adjustment plate. The lumbar adjustment base is mounted on the surface of the fixed mounting plate, the lumbar adjustment upper cover is snap-fitted with the lumbar adjustment base, the pin shaft is mounted at the upper end of the lumbar adjustment base, the tail end of the lumbar support mounting plate is sleeved with the pin shaft, and the lumbar support mounting plate rotates around the pin shaft. The double torsion spring is sleeved on the outer wall of the pin shaft, and one end of the double torsion spring is fixedly connected to a fixed seat provided inside the lumbar adjustment base, and the other end of the double torsion spring is in sliding contact with the inner side wall surface of the tail end of the lumbar support mounting plate, so that the lumbar support mounting plate maintains an outward springing state, realizing the lumbar support following the waist effect. The adjustment plate is located at the lower end of the lumbar adjustment base, and a rotating shaft provided at the tail end of the adjustment plate is rotatably connected to a rotating seat provided inside the lumbar adjustment base. A notch is provided at the front end of the lumbar support mounting plate, and the front end of the adjustment plate is inserted into the notch. By controlling the rotation of the adjustment plate, the springing height of the lumbar support mounting plate is adjusted, and thus the locking of the springing height of the lumbar support is realized.

2. The lumbar support adjusting mechanism according to claim 1, characterized in that: The connection between the lumbar support mounting plate and the pin shaft is connected by a provided bushing.

3. The lumbar support adjusting mechanism according to claim 1, characterized in that: A limit rubber block is provided at the upper end of the lumbar adjustment base, which cooperates with a limit plate provided at the tail end of the lumbar support mounting plate to limit the lifting angle of the lumbar support mounting plate.

4. The lumbar support adjusting mechanism according to claim 1, characterized in that: A shock-absorbing block is provided inside the notch.

5. The lumbar support adjusting mechanism according to claim 1, characterized in that: A gear shaft assembly is provided on one side of the tail end of the adjustment plate. The gear shaft assembly includes a gear and a locking gear block. The gear is located on one side of the rotating shaft, and the gear is fixedly connected to the rotating shaft and rotates synchronously with it. A sliding groove is provided on one side inside the lumbar adjustment base, and the locking gear block is located in the sliding groove and smoothly slides inside the sliding groove. When the locking gear block engages with the gear, the rotating shaft and the push plate are in a locked state, and vice versa, the rotating shaft and the push plate rotate freely.

6. The lumbar support adjusting mechanism according to claim 5, characterized in that: A compression spring is provided inside the sliding groove, and the compression spring is connected to the back side of the locking gear block for squeezing and pushing the locking gear block to move towards the gear. A latch is provided inside the locking gear block, and the latch engages with the locking gear block and is connected to the wire control cable. The wire control cable passes through the compression spring and is connected to an external locking switch box. By pulling the locking gear block to move through the wire control cable, the locking gear block is separated from the gear.

7. The lumbar support adjusting mechanism according to claim 6, characterized in that: The locking switch box includes a locking switch bottom case, a locking switch upper cover, a handwheel, a limiting wheel and a limiting block. The locking switch bottom case and the locking switch upper cover are snap-fitted and assembled. A handwheel shaft is provided at the lower end of the handwheel. The lower end of the handwheel shaft is inserted into the interior of the locking switch bottom case from the locking switch upper cover. The limiting wheel is located inside the locking switch bottom case. The lower end of the handwheel shaft is connected to the limiting wheel through a provided pin. One side of the limiting wheel is connected to the wire control cable. By rotating the handwheel, the limiting wheel is driven to engage with the limiting block provided inside the locking switch bottom case to reach the locking position. At this time, the wire control cable pulls the locking gear block to separate from the gear.

8. The lumbar support adjusting mechanism according to claim 7, wherein: A slot is provided on the side wall at the lower end of the lumbar adjustment base. A jack is provided on one side at the front end of the lumbar support mounting plate. The jack and the slot are inserted and matched with each other through a provided mounting pin to overcome the torsion force of the double torsion spring.

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