Waist support adjusting mechanism

Abstract

The utility model 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] This utility model relates to the field of seat technology, specifically to a lumbar support adjustment mechanism. Background Technology

[0002] Currently, ergonomic chairs are widely favored by people. They not only make users comfortable 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 currently only have a slight protrusion in the lumbar region to provide lumbar support. This design often fails to achieve the desired support effect, rendering the lumbar support virtually useless. Furthermore, the lumbar support adjustment mechanisms on the market have limited height adjustment, and the user must maintain a fixed posture to receive lumbar support. This is not only inconvenient to operate, requiring users to make multiple adjustments to find a suitable angle, but also counterproductive if the adjustment is too prominent, resulting in discomfort. Therefore, an office chair back that provides both support and adaptive adjustment is especially important for office workers. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model discloses a lumbar support adjustment mechanism to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a lumbar support adjustment mechanism, comprising 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 wired control pull cable, thereby adjusting the rotation angle of the lumbar support mounting plate and locking the lumbar support;

[0006] The elastic waist adjustment element includes a waist adjustment base, a waist adjustment top cover, a flat-headed grooved pin, a double torsion spring, and an adjustment plate. The waist adjustment base is mounted on the surface of the fixed mounting plate. The waist adjustment top cover and the waist adjustment base are interlocked. The pin is mounted on the upper end of the waist adjustment base. An open retaining ring is provided on one side of the pin to limit its axial position. The tail end of the waist support mounting plate is fitted with the pin. The waist support mounting plate rotates around the pin. The double torsion spring is sleeved on the outer wall of the pin, and one end of the double torsion spring is connected to the inner part of the waist adjustment base. Some of the fixed seats are fixedly connected, and the other end of the double torsion spring slides in contact with the inner side wall of the tail end of the lumbar support mounting plate, so that the lumbar support mounting plate keeps in an outward pop-up state, realizing the lumbar support chasing the waist effect. The adjustment plate is located at the lower end of the lumbar adjustment base, and the rotating shaft provided at the tail end of the adjustment plate is rotatably connected to the rotating seat provided in the lumbar adjustment base. The front end of the lumbar support mounting plate is provided with a slot, and the front end of the adjustment plate is inserted into the slot. By controlling the rotation of the adjustment plate, the pop-up height of the lumbar support mounting plate is adjusted, thereby realizing the locking of the pop-up height of the lumbar support.

[0007] Preferably, the lumbar support mounting plate is connected to the pin shaft via a bushing.

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

[0009] Preferably, a shock-absorbing block is provided on the inner side of the slot.

[0010] Preferably, a gear shaft assembly is provided on one side of the tail end of the adjusting 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 is fixedly connected to the rotating shaft. The two rotate synchronously. A sliding groove is provided on one side of the inner side of the waist-adjusting base. The locking gear block is located in the sliding groove and slides smoothly inside the sliding groove. When the locking gear block and the gear are engaged, the rotating shaft and the push plate are locked. Otherwise, the rotating shaft and the push plate rotate freely.

[0011] Preferably, a compression spring is provided inside the sliding groove. The compression spring is connected to the back side of the locking gear block and is used to squeeze and push the locking gear block to move towards the gear. A locking block is provided inside the locking gear block. The locking block engages with the locking gear block and is connected to the wired control cable. The wired control cable passes through the compression spring and is connected to the external locking switch box. The locking gear block is moved by pulling the wired control cable, so that the locking gear block separates from the gear, thereby enabling the waist support to achieve the function of waist tracking.

[0012] Preferably, the locking switch box includes a locking switch bottom shell, a locking switch top cover, a handwheel, a limiting wheel, and a limiting block. The locking switch bottom shell and the locking switch top cover are engaged with each other. The lower end of the handwheel is provided with a handwheel shaft, and the lower end of the handwheel shaft is inserted into the interior of the locking switch bottom shell from the locking switch top cover. The limiting wheel is located inside the locking switch bottom shell, and 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 wired control cable. By rotating the handwheel, the limiting wheel is driven to engage with the limiting block provided in the locking switch bottom shell, reaching the locking position. At this time, the wired control cable pulls the locking gear block to separate from the gear.

[0013] Preferably, the lower side wall of the waist adjustment base is provided with a slot, and the front side of the waist support mounting plate is provided with an insertion hole. The insertion hole and the slot are engaged with each other by a mounting pin, which is used to overcome the torsion of the double torsion spring and facilitate the assembly of the waist support mounting plate, gear shaft assembly and shock absorber temporary components, and can be removed after the entire chair back is assembled.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. In this utility model, through the linkage design of double torsion springs and adjustment plate, the lumbar support can automatically bounce up and fit the user's lumbar pressure. When the human body moves, it can dynamically follow the waist in real time, so that the waist can get a certain support, realize dynamic following support, adapt to different sitting postures and body shape needs, and improve lumbar comfort.

[0016] 2. In this utility model, a wire-controlled pull cable combined with a gear locking structure is adopted. Users can quickly switch the locking state by rotating the handwheel and freely choose dynamic waist tracking or static fixed support. It has a large stroke and multiple locking functions to meet the strong support of the waist under different postures and meet the needs of diverse usage scenarios.

[0017] 3. In this utility model, the mechanical impact caused by waist pressure is effectively buffered by the synergistic effect of the limiting rubber block, shock-absorbing pad and shock-absorbing block, reducing component wear and operating noise. At the same time, the bushing and retaining ring design ensures rotational stability and extends the service life of the mechanism. Attached Figure Description

[0018] The accompanying drawings are provided to further understand the present invention and form 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 thereof.

[0019] In the attached diagram:

[0020] Figure 1 This is a schematic diagram of the overall structure of the lumbar support adjustment mechanism of this utility model;

[0021] Figure 2This is a side view of the lumbar support adjustment mechanism of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the elastic waist adjustment element of this utility model;

[0023] Figure 4 This is a schematic diagram of the internal structure of the spring-loaded waist adjustment element of this utility model;

[0024] Figure 5 This is a schematic diagram of the lumbar support mounting plate of this utility model from one perspective;

[0025] Figure 6 This is a schematic diagram of the assembly of the double torsion spring and the pin shaft of this utility model;

[0026] Figure 7 This is a structural schematic diagram of the gear shaft assembly of this utility model;

[0027] Figure 8 This is a schematic diagram of the internal structure of the locking gear block of this utility model;

[0028] Figure 9 This is a schematic diagram of the internal structure of the locking switch box of this utility model;

[0029] The diagram labels are as follows: 1. Lumbar support; 2. Lumbar support mounting plate; 201. Groove; 202. Bushing; 3. Fixed mounting plate; 401. Lumbar adjustment base; 402. Lumbar adjustment top cover; 403. Pin; 404. Double torsion spring; 405. Adjusting plate; 406. Open retaining ring; 407. Fixed seat; 408. Rotating shaft; 409. Rotating seat; 410. Limiting rubber block; 411. Limiting plate; 412. Shock absorber block; 4 13. Slot; 414. Socket; 415. Mounting pin; 5. Locking switch box; 501. Locking switch bottom shell; 502. Locking switch top cover; 503. Handwheel; 504. Limit wheel; 505. Limit block; 506. Handwheel shaft; 507. Pin; 601. Gear; 602. Locking gear block; 603. Sliding groove; 604. Compression spring; 605. Locking block; 7. Wired control cable; 8. Shock-absorbing pad. Detailed Implementation

[0030] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0031] Example: Figures 1-9As shown, 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 chair back, 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 wired pull cable 7, thereby adjusting the rotation angle of the lumbar support mounting plate 2 and locking the lumbar support 1.

[0032] Among them, such as Figures 2-6 As shown, the spring-loaded waist adjustment element includes a waist adjustment base 401, a waist adjustment upper cover 402, a flat-headed grooved pin 403, a double torsion spring 404, and an adjustment plate 405. The waist adjustment base 401 is mounted on the surface of the fixed mounting plate 3. The waist adjustment upper cover 402 is engaged with the waist adjustment base 401, and the lower surface of the waist adjustment upper cover 402 is provided with shock-absorbing pads 8 for shock absorption between the waist support mounting plate 2 and the waist adjustment upper cover 402. The pin 403 is mounted on the upper end of the waist adjustment base 401. An open retaining ring 406 is provided on one side of the pin 403 to limit the axial position of the pin 403. The tail end of the waist support mounting plate 2 is fitted with the pin 403. The connection between the waist support mounting plate 2 and the pin 403 is provided by a bushing 202. The waist support mounting plate 2 rotates around the pin 403. The upper end of the waist adjustment base 401 is provided with a limiting rubber block 410, which cooperates with the limiting plate 411 provided at the tail end of the waist support mounting plate 2 to limit the axial position of the pin 403. The maximum angle at which the lumbar support mounting plate 2 is raised is specified to prevent it from being raised 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 the fixing seat 407 provided inside the lumbar adjustment base 401. The other end of the double torsion spring 404 slides in contact with the inner side wall of the tail end of the lumbar support mounting plate 2, keeping the lumbar support mounting plate 2 in an outward-curving state to achieve the lumbar support 1's waist-following effect. The adjusting plate 405 is located at the lower end of the lumbar adjustment base 401, and the adjusting plate 405... The rotating shaft 408 at the tail end is rotatably connected to the rotating seat 409 inside the waist adjustment base 401. The front end of the waist support mounting plate 2 is provided with a slot 201. The front end of the adjusting plate 405 is inserted into the slot 201. A shock-absorbing block 412 is provided inside the slot 201. The adjusting plate 405 contacts the shock-absorbing block 412 to perform shock absorption. By controlling the rotation of the adjusting plate 405, the pop-up height of the waist support mounting plate 2 is adjusted, thereby locking the pop-up height of the waist support 1.

[0033] Furthermore, such as Figure 7 and Figure 8As shown, a gear shaft assembly is located 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 is fixedly connected to the rotating shaft 408, and the two rotate synchronously. A sliding groove 603 is provided on one side of the waist-adjusting base 401. The locking gear block 602 is located in the sliding groove 603 and slides smoothly inside the sliding groove 603. When the locking gear block 602 and the gear 601 are engaged, the rotating shaft 408 and the push plate are locked. Conversely, when the rotating shaft 408 and the push plate are not engaged, the rotating shaft 408 and the push plate are locked. The movable plate rotates freely; a compression spring 604 is provided inside the sliding groove 603. The compression spring 604 is connected to the back side of the locking gear block 602 and is used to squeeze and push the locking gear block 602 to move towards the gear 601. A locking block 605 is provided inside the locking gear block 602. The locking block 605 is engaged with the locking gear block 602 and is connected to the wired control cable 7. The wired control cable 7 passes through the compression spring 604 and is connected to the external locking switch box 5. The locking gear block 602 is moved by the wired control cable 7, so that the locking gear block 602 is separated from the gear 601, thereby enabling the waist support 1 to achieve the function of waist tracking.

[0034] Furthermore, such as Figure 5 As shown, a slot 413 is provided on the lower side wall of the waist adjustment base 401, and an insertion hole 414 is provided on one side of the front end of the waist support mounting plate 2. The insertion hole 414 and the slot 413 are engaged with each other by a mounting pin 415, which is used to overcome the torque of the double torsion spring 404 and facilitate the assembly of the waist support mounting plate 2, the gear shaft assembly and the shock absorber 412 as temporary components, and can be removed after the entire chair back is assembled.

[0035] Among them, such as Figure 9 As shown, the locking switch box 5 includes a locking switch bottom shell 501, a locking switch top cover 502, a handwheel 503, a limiting wheel 504, and a limiting block 505. The locking switch bottom shell 501 and the locking switch top cover 502 are engaged with each other. The lower end of the handwheel 503 is provided with a handwheel shaft 506, and the lower end of the handwheel shaft 506 is inserted into the locking switch bottom shell 501 from the locking switch top cover 502. The limiting wheel 504 is located in the locking switch bottom shell 501. Inside 01, the lower end of the handwheel shaft 506 is connected to the limiting wheel 504 via a pin 507. One side of the limiting wheel 504 is connected to the wire control cable 7. By rotating the handwheel 503, the limiting wheel 504 is driven to engage with the limiting block 505 provided in the bottom shell 501 of the locking switch. In this embodiment, turning the handwheel 503 at an angle of 50° will achieve the locking position. At this time, the wire control cable 7 pulls the locking gear block 602 to separate from the gear 601.

[0036] Specific working principle:

[0037] First, install the entire mechanism onto the desired seat back using the mounting plate 3. Then, fix the lumbar support 1 onto the lumbar support mounting plate 2. Turn the handwheel 503 to lock the locking switch box 5. Use the wired pull cable 7 to pull the locking gear block 602 along the slide groove away from the gear 601. The gear 601 and the locking gear block 602 will separate. The gear 601 and the adjusting plate 405 will rotate freely. At this time, the torsion spring in the lumbar adjustment element can bounce the lumbar support 1 to the maximum limit position. When the lumbar support 1 is supported by the user's leaning force, the lumbar support 1 will move closely against the user's waist to achieve the purpose of waist tracking.

[0038] When the user needs fixed support during waist support, turn the handwheel 503 to unlock the locking switch box 5. 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 slide groove towards the gear 601 and engage with the gear 601. That is, the adjustment plate 405 will be locked. At this time, the height of the waist support 1 will be locked, thus achieving the locking effect of the waist support 1.

[0039] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lumbar support adjustment 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 wired control cable, thereby adjusting the rotation angle of the lumbar support mounting plate and locking the lumbar support; The spring-loaded waist adjustment element includes a waist adjustment base, a waist adjustment top cover, a pin, a double torsion spring, and an adjustment plate. The waist adjustment base is mounted on the surface of the fixed mounting plate. The waist adjustment top cover and the waist adjustment base are interlocked. The pin is mounted on the upper end of the waist adjustment base. The tail end of the waist support mounting plate is fitted with the pin. The waist support mounting plate rotates around the pin. The double torsion spring is sleeved on the outer wall of the pin. One end of the double torsion spring is fixedly connected to a fixed seat provided inside the waist adjustment base. The other end of the double torsion spring slides in contact with the inner side wall of the tail end of the waist support mounting plate, keeping the waist support mounting plate in an outward spring-loaded state. The adjustment plate is located at the lower end of the waist adjustment base. The rotating shaft provided at the tail end of the adjustment plate is rotatably connected to the rotating seat provided inside the waist adjustment base. The front end of the waist support mounting plate has a slot. The front end of the adjustment plate is inserted into the slot. By controlling the rotation of the adjustment plate, the spring-loaded height of the waist support mounting plate is adjusted.

2. The lumbar support adjustment mechanism according to claim 1, characterized in that: The lumbar support mounting plate is connected to the pin shaft via a bushing.

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

4. The lumbar support adjustment mechanism according to claim 1, characterized in that: A shock-absorbing block is provided on the inner side of the slot.

5. The lumbar support adjustment 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 is fixedly connected to the rotating shaft. The two rotate synchronously. A sliding groove is provided on one side of the waist adjustment base. The locking gear block is located in the sliding groove and slides smoothly inside the sliding groove.

6. The lumbar support adjustment mechanism according to claim 5, characterized in that: A compression spring is provided inside the sliding groove. The compression spring is connected to the back side of the locking gear block and is used to squeeze and push the locking gear block to move towards the gear. A locking block is provided inside the locking gear block. The locking block engages with the locking gear block and is connected to the wired control cable. The wired control cable passes through the compression spring and is connected to the external locking switch box. The locking gear block is moved by pulling the wired control cable, so that the locking gear block separates from the gear.

7. The lumbar support adjustment mechanism according to claim 6, characterized in that: The locking switch box includes a locking switch bottom shell, a locking switch top cover, a handwheel, a limit wheel, and a limit block. The locking switch bottom shell and the locking switch top cover are engaged with each other. The handwheel has a handwheel shaft at its lower end, and the lower end of the handwheel shaft is inserted into the locking switch bottom shell from the locking switch top cover. The limit wheel is located inside the locking switch bottom shell, and the lower end of the handwheel shaft is connected to the limit wheel through a pin. One side of the limit wheel is connected to the wired control cable. By rotating the handwheel, the limit wheel is engaged with the limit block provided in the locking switch bottom shell, reaching the locking position. At this time, the wired control cable pulls the locking gear block to separate from the gear.

8. The lumbar support adjustment mechanism according to claim 7, characterized in that: The lower side wall of the waist adjustment base is provided with a slot, and the front side of the waist support mounting plate is provided with an insertion hole. The insertion hole and the slot are engaged with each other by a mounting pin.

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