Office chair with adjustable chair back

Abstract

The utility model relates to an office chair with an adjustable chair back, which comprises chair legs, the chair legs are connected with a base plate, the base plate is provided with a chair seat, the base plate is connected with a support, the support is provided with a plurality of limiting grooves distributed along the vertical direction, the support is connected with the chair back capable of sliding up and down relative to the support, the chair back is provided with a limiting plate, and the limiting plate is connected with the chair back. The limiting plate is provided with a clamping part which can be clamped and matched with the limiting groove so as to limit the sliding of the chair back, and the limiting plate is also provided with a pulling rod device which can drive the clamping part to be clamped into or separated from the limiting groove. The chair back is characterized in that the limiting grooves distributed in the vertical direction are formed in the support, the clamping parts can be matched with the limiting grooves in a clamping mode so as to limit sliding of the chair back, and the pulling rod device can drive the clamping parts to be separated from the limiting grooves; a user can quickly adjust the height of the chair back by moving the chair back up and down only by pulling out the pulling rod device, and the operation is simple.

Description

TECHNICAL FIELD

[0001] The utility model relates to office chair technical field, concretely relates to an office chair with adjustable chair back. BACKGROUND

[0002] Office chair is designed for the seat in office environment, through providing comfortable sitting posture support, reduces the physical discomfort that long time sitting work brings to the user.

[0003] Traditional office chair usually relies on manual knob or wrench to adjust the height of chair back. However, the operation steps of this adjusting mechanism are complicated, and after long-term use or affected by external force, the adjusting mechanism may be loose, causing the chair back to slide down, affecting the stability and comfort of use. SUMMARY

[0004] The utility model discloses a kind of office chairs with adjustable chair back, by the setting of reasonable chair back adjusting mechanism, to solve the above problems.

[0005] In order to solve the above technical problems, the utility model provides the following technical scheme: an office chair with adjustable chair back, comprising a chair leg, the chair leg is connected with a bottom disc, the bottom disc is provided with a seat, the bottom disc is connected with a support, the support is provided with a plurality of limiting grooves distributed in the up-down direction, and the support is connected with a chair back capable of sliding up and down relative thereto, a limiting plate is provided on the chair back, the limiting plate is provided with a clamping portion capable of being clamped with the limiting groove to limit the sliding of the chair back, and a pull rod device capable of clamping the clamping portion into or out of the limiting groove is further provided on the limiting plate.

[0006] As a further optimization scheme of the utility model, the limiting plate is an elastic plate capable of elastically deforming in the front-back direction, one end of the limiting plate is fixedly connected with the chair back, and the clamping portion is arranged at the free end of the limiting plate.

[0007] As a further optimization scheme of the utility model, the support is provided with a limiting block located above the limiting groove and capable of blocking the upward sliding of the clamping portion, a receiving groove matched with the limiting block is formed on the front side of the free end of the limiting plate, the rear side surface of the limiting block forms a first inclined surface, and the bottom surface of the receiving groove has a second inclined surface matched with the first inclined surface.

[0008] As a further optimization scheme of the utility model, the chair back is provided with a receiving cavity for the support to extend into, the limiting plate is arranged in the receiving cavity, and a contact portion is arranged on the rear side of the middle part of the limiting plate and abuts against the inner wall of the receiving cavity.

[0009] As a further optimization scheme of the utility model, the rear side of the chair back is detachably connected with a mounting sleeve, and the accommodating cavity is arranged in the mounting sleeve.

[0010] As a further optimization scheme of the utility model, the side wall of the accommodating cavity is provided with guiding blocks distributed along the up-down direction, and the side wall of the support is provided with guiding grooves in sliding cooperation with the guiding blocks.

[0011] As a further optimization scheme of the utility model, the limiting plate is provided with elastic arms for pushing the clamping part into the limiting groove and integrally arranged with the limiting plate.

[0012] As a further optimization scheme of the utility model, the pull rod device comprises a pull rod part arranged on the limiting plate, and the upper part of the pull rod part is detachably connected with a pull rod head exposed from the outside of the chair back.

[0013] As a further optimization scheme of the utility model, the pull rod head comprises a sleeve part for the pull rod part to extend into, and a handle part arranged at the end of the sleeve part, the upper part of the pull rod part is circumferentially provided with an annular groove, the sleeve part is provided with a lock hole capable of being aligned with the annular groove when the pull rod part extends to a predetermined depth, and a bolt is arranged between the annular groove and the mounting groove and penetrates both.

[0014] As a further optimization scheme of the utility model, the chair back comprises a backrest part, and a handrest part integrally formed with the backrest part and arranged on the left and right sides of the backrest part.

[0015] Compared with the prior art, the utility model has the advantages that: through the limiting grooves distributed along the up-down direction on the support, the clamping part capable of being clamped and cooperated with the limiting grooves to limit the sliding of the chair back, and the pull rod device capable of driving the clamping part to separate from the limiting groove, the user only needs to pull out the pull rod device to realize the quick adjustment of the height of the chair back by moving the chair back up and down, and the operation is simple. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic view of the utility model;

[0017] Figure 2 It is an exploded schematic view of the chair back and the support in the utility model;

[0018] Figure 3 It is a sectional view schematic view of the utility model;

[0019] Figure 4 It is Figure 3 It is a local enlarged schematic view of A in the utility model;

[0020] Figure 5 It is a structural schematic view of the limiting plate in the utility model;

[0021] Figure 6 It is the structure schematic view of the support in the utility model.

[0022] Figure 7 It is the structure schematic view of the mounting sleeve in the utility model. DETAILED DESCRIPTION

[0023] The embodiment of the utility model will be explained in detail below with reference to the drawings.

[0024] As Figures 1 to 7 The utility model discloses an office chair with adjustable chair back, including chair leg 1, be connected with the bottom disc 2 on chair leg 1, be equipped with the seat 3 on the bottom disc 2, the bottom disc 2 is connected with support 4, support 4 is equipped with a plurality of along the up-down direction distribution's limiting slot 41, and support 4 is connected with the chair back 5 that can slide up and down relative to it, be equipped with the limiting plate 6 on the chair back 5, the limiting plate 6 is equipped with the clamping portion 61 that can be with limiting slot 41 clamping cooperation to limit the sliding of chair back 5, the limiting plate 6 is also equipped with the pull rod device 8 that can drive clamping portion 61 to be clamped into or separate limiting slot 41.

[0025] Chair leg 1 is used to provide the basic support of whole chair, through the bottom disc 2, chair leg 1, seat 3, support 4 can be connected, ensure the stability of chair. Support 4 along the up-down direction distribution has multiple limiting slot 41, through the cooperation of the clamping portion 61 on the limiting plate 6 and the limiting slot 41 on support 4, make chair back 5 can be locked on multiple preset height positions. Through the pull rod device 8 setting that can drive clamping portion 61 to separate limiting slot 41, make user can pull out pull rod device 8 and remove the locking state between clamping portion 61 and limiting slot 41, improve the flexibility and convenience of chair back 5 adjustment.

[0026] Through the limiting slot 41 of support 4 along the up-down direction distribution, the clamping portion 61 that can be with limiting slot 41 clamping cooperation to limit the sliding of chair back 5 and the pull rod device 8 setting that can drive clamping portion 61 to separate limiting slot 41, user only needs to pull out pull rod device 8 to realize the quick adjustment of chair back 5 height by the way of moving chair back 5 up and down, simple operation.

[0027] The limiting plate 6 is the elastic plate that can be elastically deformed along the front-back direction, one end of the limiting plate 6 is fixedly connected with the chair back 5, and the clamping portion 61 is arranged at the free end 64 of the limiting plate 6.

[0028] The limiting plate 6 can be elastically deformed under stress, when a user needs to adjust the height of the chair back 5, an outward force is applied to the limiting plate 6 by operating the pull rod device 8, so that the limiting plate 6 is elastically deformed under stress, the clamping portion 61 at the free end of the limiting plate 6 is separated from the limiting slot, and the chair back 5 is allowed to slide up and down.

[0029] The support 4 is provided with a limiting block 42 above the limiting groove 41 and capable of blocking the upward sliding of the clamping part 61, the free end 64 of the limiting plate 6 is provided with a containing groove 62 matched with the limiting block 42, the rear side of the limiting block 42 is formed with a first inclined surface 421, and the bottom surface of the containing groove 62 is provided with a second inclined surface 621 matched with the first inclined surface 421.

[0030] In the embodiment, the limiting block 42 is used to limit the clamping part 61 from exceeding the preset stroke range in the sliding direction, so as to ensure the stability of the chair back 5 adjustment. When the clamping part 61 is clamped into the limiting groove 41 near the limiting block 42, the containing groove 62 at the front side of the free end 64 of the limiting plate 6 can be used for the limiting block 42 to enter when the limiting plate 6 is reset, so as to prevent the limiting block 42 from interfering with the reset of the free end 64 of the limiting plate 6. The rear side of the limiting block 42 is formed with the first inclined surface 421, and the bottom surface of the containing groove 62 is provided with the second inclined surface 621 matched with the first inclined surface 421, so that the limiting block 42 can smoothly enter the containing groove 62, and the operation smoothness when the clamping part 61 is clamped into the limiting groove 41 near the limiting block 42 is improved.

[0031] The chair back 5 is provided with a containing cavity 51 for the support 4 to extend into, and the limiting plate 6 is arranged in the containing cavity 51. The rear side of the middle part of the limiting plate 6 is provided with an abutting part 63 abutting against the inner wall of the containing cavity 51.

[0032] The containing cavity 51 is arranged so that the support 4 can be embedded in the chair back 5, thereby realizing the height adjustment function of the chair back 5. In the embodiment, the pull rod device 8 is arranged close to the free end of the limiting plate 6, and the abutting part 63 arranged at the rear side of the middle part of the limiting plate 6 is arranged so that the deformation of the limiting plate 6 can be concentrated at the free end 64, the deformation of the non-design area from the fixed end of the limiting plate 6 to the abutting part 63 is reduced, and the service life of the component is prolonged.

[0033] The rear side of the chair back 5 is detachably connected with a mounting sleeve 9, and the containing cavity 51 is arranged in the mounting sleeve 9.

[0034] The detachable design of the mounting sleeve 9 facilitates the maintenance and replacement of the limiting plate 6 arranged in the containing cavity 51 by the user.

[0035] The side wall of the containing cavity 51 is provided with a guide block 52 distributed in the up-down direction, and the side wall of the support 4 is provided with a guide groove 43 in sliding cooperation with the guide block 52.

[0036] The cooperation of the guide block 52 and the guide groove 43 ensures that the support 4 can keep straight-line movement when moving up and down, avoids the deviation or shaking of the chair back 5 during the adjustment process, and improves the use stability.

[0037] The limiting plate 6 is provided with an elastic arm 7 arranged integrally with the limiting plate 6 and used for pushing the clamping part 61 to be clamped into the limiting groove 41.

[0038] When the user adjusts the height of the chair back 5, the elastic arm 7 can push the clamping part 61 into the limiting groove 41 after the user releases the pull rod device 8, simplifying the process of adjusting the height of the chair back 5 and improving the convenience of use. At the same time, through the elastic arm 7 provided on the limiting plate 6 and used to push the clamping part 61 into the limiting groove 41, the stability of the adjustment mechanism is ensured when the chair back 5 is fixed, and accidental displacement is avoided, ensuring the comfort of the office chair. Compared with the elastic member and other ways to push the clamping part 61 into the limiting groove 41, the design of the elastic arm 7 and the limiting plate 6 being integrally arranged simplifies the manufacturing process and reduces the risk of loosening or damage.

[0039] The pull rod device 8 includes a pull rod part 81 provided on the limiting plate 6, and the upper part of the pull rod part 81 is detachably connected with a pull rod head 82 exposed from the outside of the chair back 5.

[0040] The pull rod head 82 provides an action point, and the user can apply force to it to pull the limiting plate 6 to produce elastic deformation, thereby releasing the clamping part 61. The design that the pull rod head 82 is exposed from the outside of the chair back 5 ensures that the user can easily touch and operate, improving the operation convenience. The detachable connection of the pull rod head 82 and the pull rod part 81 can simplify the maintenance process, and the user can replace or clean the parts by himself when needed, reducing the maintenance cost.

[0041] The pull rod head 82 includes a sleeve part 821 for the pull rod part 81 to extend into, and a handle part 822 provided at the end of the sleeve part 821, and the upper part of the pull rod part 81 is circumferentially provided with an annular groove 811, and the sleeve part 821 is provided with a lock hole 8211 which can be aligned with the annular groove 811 when the pull rod part 81 extends to a predetermined depth, and the annular groove 811 and the mounting groove are provided with a bolt 83 penetrating through both.

[0042] The sleeve part 821 is provided at one end of the pull rod head 82, and the handle part 822 can facilitate holding the pull rod head 82. The sleeve part 821 is provided with the lock hole 8211, which can be aligned with the annular groove 811 when the pull rod part 81 extends to a predetermined depth. At this time, the bolt 83 can pass through the annular groove 811 and the lock hole 8211, so that the pull rod head 82 and the pull rod part 81 are locked, ensuring the stability of the adjustment mechanism.

[0043] The chair back 5 includes a backrest part 53, and a handrest part 54 integrally formed with the backrest part 53 and arranged on the left and right sides of the backrest part 53.

[0044] The armrest 54 is integrally formed with the backrest 53, which can simplify the manufacturing process. The armrest 54 is arranged on the left and right sides of the backrest 53 to provide arm support for the user. The user can adjust the height of the chair back 5 to adjust the armrest 54 to a suitable height. The combination of the backrest 53 and the armrest 54 provides comprehensive support for the user, reduces the physical fatigue of the user during long-term use, and improves the overall comfort.

Claims

1. An office chair with adjustable backrest, characterized in that, The application relates to a chair leg (1) connected with a bottom disc (2), the bottom disc (2) is provided with a seat (3), the bottom disc (2) is connected with a support (4), the support (4) is provided with a plurality of limiting grooves (41) distributed along the up-down direction, the support (4) is connected with a backrest (5) capable of sliding up and down relative to the support (4), the backrest (5) is provided with a limiting plate (6), the limiting plate (6) is provided with a clamping part (61) capable of clamping the limiting grooves (41) to limit the sliding of the backrest (5), the limiting plate (6) is further provided with a pull rod device (8) capable of clamping the clamping part (61) into or out of the limiting grooves (41).

2. An office chair with adjustable backrest according to claim 1, characterized in that The limiting plate (6) is an elastic plate capable of elastically deforming along the front-back direction, one end of the limiting plate (6) is fixedly connected with the backrest (5), and the clamping part (61) is arranged at a free end (64) of the limiting plate (6).

3. An office chair with adjustable backrest according to claim 2, characterized in that The support (4) is provided with a limiting block (42) located above the limiting grooves (41) and capable of blocking the upward sliding of the clamping part (61), a containing groove (62) matched with the limiting block (42) is formed in the front side of the free end (64) of the limiting plate (6), the rear side of the limiting block (42) is formed into a first inclined surface (421), and the bottom surface of the containing groove (62) is provided with a second inclined surface (621) matched with the first inclined surface (421).

4. An office chair with adjustable backrest according to claim 2, characterized in that, The backrest (5) is provided with a containing cavity (51) for the support (4) to extend into, the limiting plate (6) is arranged in the containing cavity (51), and a contact part (63) is arranged at the middle rear side of the limiting plate (6) and abuts against the inner wall of the containing cavity (51).

5. An office chair with adjustable backrest according to claim 4, characterized in that The rear side of the backrest (5) is detachably connected with a mounting sleeve (9), and the containing cavity (51) is arranged in the mounting sleeve (9).

6. An office chair with adjustable backrest according to claim 5, characterized in that The side wall of the containing cavity (51) is provided with guide blocks (52) distributed along the up-down direction, and the side wall of the support (4) is provided with guide grooves (43) slidably matched with the guide blocks (52).

7. An office chair with adjustable backrest according to claim 1, characterized in that, The limiting plate (6) is provided with elastic arms (7) arranged integrally with the limiting plate (6) and used for clamping the clamping part (61) into the limiting grooves (41).

8. An office chair with adjustable backrest according to claim 1, characterized in that, The pull rod device (8) comprises a pull rod part (81) arranged on the limiting plate (6), and the upper part of the pull rod part (81) is detachably connected with a pull rod head (82) exposed outside the backrest (5).

9. An office chair with adjustable backrest according to claim 8, characterized in that The pull rod head (82) comprises a sleeve part (821) for the pull rod part (81) to extend into and a handle part (822) arranged at the end of the sleeve part (821), the upper part of the pull rod part (81) is circumferentially provided with an annular groove (811), the sleeve part (821) is provided with a lock hole (8211) capable of being aligned with the annular groove (811) when the pull rod part (81) extends to a predetermined depth, and a bolt (83) penetrating through the annular groove (811) and the mounting groove is arranged between the annular groove (811) and the mounting groove.

10. An office chair with adjustable backrest according to claim 1, characterized in that, The backrest (5) comprises a backrest part (53) and handrest parts (54) integrally formed with the backrest part (53) and arranged on the left and right sides of the backrest part (53).

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