CN221914458U - Adjustable backrest device - Google Patents

Abstract

An adjustable backrest device comprises at least two backrest plates, a back frame and an adjustment component mounted on the back frame, the adjustment component comprising: a shell and at least two connecting members, a knob and a transmission mechanism arranged on the shell, the connecting members are respectively connected to the backrest plates, the knob drives the connecting members to move closer to or away from each other through the transmission mechanism, and the movable backrest plates can be adjusted to a spacing and height that matches the user's body shape. The operation method is simple and convenient, and solves the problem that the existing device can only adjust the height of the seat backrest but cannot simultaneously adjust the width and height of the backrest according to users of different body shapes.

Description

Adjustable backrest device

Technical Field

The utility model relates to the technical field of seats, in particular to an adjustable backrest device.

Background Art

At present, there are many sitting lumbar support devices on the market. A more common type of lumbar support device includes two backrests (split design) that are spaced apart and symmetrical in width. A buffer connection portion is provided on the rear side of each backrest to provide buffering force for the backrest. The backrest is installed on the back panel through the buffer connection portion. This type of lumbar support device improves the comfort of people when using the seat to a certain extent.

After searching, the application with patent number 202020613110.6 discloses a liftable backrest armrest assembly for rear passengers of an electric vehicle, including a rear armrest and a rear backrest arranged above the rear armrest, a bracket is connected between the rear armrest and the rear backrest, the bracket includes an upper bracket arranged at the bottom of the rear backrest and a lower bracket arranged at the top of the rear armrest, the upper bracket is provided with a highly extended rack, the upper part of the lower bracket is sleeved outside the rack, the lower bracket is provided with a gear meshing with the rack, the gear is connected to a worm gear mechanism, and the worm gear mechanism is connected to an adjustment knob for driving the worm gear mechanism.

Although the liftable backrest armrest assembly for rear passengers of an electric vehicle drives a worm gear mechanism by adjusting a knob so that the height of the backrest can be adjusted, thereby meeting the use requirements of rear passengers of different heights for the backrest, the liftable backrest armrest assembly for rear passengers of an electric vehicle can only adjust the height of the seat backrest, and cannot simultaneously adjust the width and height of the backrest according to users of different body shapes, and thus has limitations.

Therefore, we propose an adjustable backrest device.

Utility Model Content

In view of the deficiencies of the prior art, the utility model provides an adjustable backrest device, which solves the problem that the prior device can only adjust the height of the seat backrest but cannot simultaneously adjust the width and height of the backrest according to users of different body shapes.

To achieve the above objectives, the utility model is implemented through the following technical solutions: an adjustable backrest device, comprising at least two backrests, a back frame and an adjustment assembly installed on the back frame, characterized in that the adjustment assembly comprises: a shell and at least two connecting parts, a knob, and a transmission mechanism arranged on the shell, the at least two connecting parts are respectively connected to the two backrests, and the knob drives the connecting parts to move closer to or away from each other through the transmission mechanism.

The utility model provides an adjustable backrest device, which has the following beneficial effects:

1. The sitting chair with a knob-adjustable lumbar support, by rotating the width adjustment knob to drive the width adjustment gear to rotate, and then the width adjustment gear drives the width adjustment rack meshing with it to move the width, which can drive the width of the movable backrest to move, and then the height adjustment knob drives the height adjustment gear to rotate, and the height adjustment gear drives the transmission gear to rotate, and then drives the height adjustment rack to move the height, which can drive the height of the two movable backrests to move, and the height and spacing of the two movable backrests can be adjusted by rotating the width adjustment knob and the height adjustment knob, and the movable backrest can be adjusted to the spacing and height that match the user's body shape. The operation method is simple and convenient, which solves the problem that the existing device can only adjust the height of the seat backrest, but cannot adjust the width and height of the backrest according to users of different body shapes at the same time;

2. The sitting chair with a knob-adjustable lumbar support can control whether the movable pressure piece of the knob is stuck inside the arc-shaped groove by pulling the width adjustment knob and the height adjustment knob outward or pressing the width adjustment knob inward, thereby achieving the purpose of limiting the width adjustment knob and the height adjustment knob by the movable pressure piece of the knob, thereby avoiding the width adjustment knob and the height adjustment knob from rotating at will.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the structure of the utility model;

Fig. 2 is a schematic cross-sectional view of the utility model;

FIG3 is a schematic diagram of the rear side structure of the utility model;

FIG4 is a schematic diagram of the front side structure of the present invention;

FIG5 is a schematic diagram of the internal structure of the adjustment component of the utility model;

FIG6 is a schematic side view of the structure of the adjustment assembly of the present invention;

FIG7 is a schematic diagram of the structure of the adjustment assembly of the utility model;

FIG8 is a schematic diagram of the internal structure of the adjustment component of the utility model;

FIG. 9 is a schematic diagram of the internal side structure of the adjustment assembly of the present invention.

In the figure: 1. Back frame; 2. Adjustment assembly; 3. Connector; 401. Width adjustment knob; 402. Height adjustment knob; 501. Back plate; 502. Soft cloth cover; 602. Slide groove; 603. Elastic connector; 604. Height adjustment rack; 605. Drive gear; 606. Center gear; 607. Transmission gear; 608. Slider rack; 609. Knob movable pressure plate; 610. Elastic connecting nut.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Example

As shown in Figures 1-9: an adjustable backrest device includes at least two backrest plates 501, a back frame 1 and an adjustment component 2 installed on the back frame 1, the adjustment component 2 includes: a shell and at least two connecting parts 3 arranged on the shell, a knob, and a transmission mechanism, the at least two connecting parts 3 are respectively connected to the two backrest plates 501, and the knob drives the connecting parts 3 to move closer to or away from each other through the transmission mechanism. The transmission mechanism includes a slide groove 602 and at least two slider racks 608. The slider racks 608 can be reciprocatingly slidably arranged in the slide groove 602. The at least two connecting members 3 are respectively arranged on the slider racks 608. A driving gear 605 is provided on one side of the width adjustment knob 401 of the knob. The driving gear 605 is arranged in the slide groove 602, and the upper and lower sides of the driving gear 605 are respectively engaged with the slider racks 608. When the width adjustment knob 401 is rotated, the driving gear 605 drives the slider rack 608 to move; the slide groove 602 can confine the slider rack 608 inside the slide groove without misalignment, thereby ensuring that when the user adjusts the width adjustment knob (401), the two slider racks (608) drive the connecting member (3) to slide.

Example

As shown in Fig. 1-9: it includes a height adjustment rack 604, the height adjustment rack 604 is fixed on the back frame 1, the housing is provided with a slideway, a height adjustment knob 402 and a height transmission mechanism corresponding to the height adjustment rack, the height adjustment rack 604 is arranged in the slideway so as to be movable up and down, and the height adjustment knob 402 drives the housing to move up and down relative to the height adjustment rack 604 through the height transmission mechanism. The height transmission mechanism includes a height driving gear, the height driving gear is arranged on one side of the height adjustment knob 402 and meshes with the height adjustment rack 604, and when the height adjustment knob 402 is rotated, the height driving gear drives the housing to move. The height driving gear includes a central gear 606 connected to the height adjustment knob 402 and a transmission gear 607 arranged on both sides of the central gear 606; the transmission gear 607 is meshed with the central gear 606, and the transmission gear is meshed with the height adjustment rack 604; when the height adjustment knob 402 is rotated, the central gear 606 drives the transmission gear 607 to rotate; the slideway limits the movement path of the shell, ensuring that the slide groove of the shell moves up and down along the height adjustment rack 604.

Example

As shown in Fig. 1-9: the connection between the connecting member 3 and the slider is elastic, and the connecting member 3 is elastically movable relative to the slider. The connecting member 3 is connected to the slider via an elastic connecting member 603 and an elastic connecting nut 610. The user's back can be elastically supported by the backrest, which is more comfortable.

Embodiment 4: The shell is provided with two knob movable pressing plates 609 which are opposite to the width adjustment knob 401 and the height adjustment knob 402. The surfaces of the width adjustment knob 401 and the height adjustment knob 402 are provided with arc-shaped grooves. The knob movable pressing plates 609 are elastic and are clamped in the inside of the arc-shaped grooves. When it is necessary to turn the width adjustment knob 401 and the height adjustment knob 402, the width adjustment knob 401 and the height adjustment knob 402 can be pulled outward to make the knob movable pressing plate 609 leave the arc-shaped groove, and the width adjustment knob 401 and the height adjustment knob 402 can be turned. After the adjustment is completed, the width adjustment knob 401 and the height adjustment knob 402 can be pressed inward again to make the knob movable pressing plate 609 stuck in the inside of the arc-shaped groove. The width adjustment knob 401 and the height adjustment knob 402 are limited by the knob movable pressing plate 609, thereby preventing the width adjustment knob 401 and the height adjustment knob 402 from rotating at will.

The outer part of the backrest 501 is covered with a soft cloth cover 502. The back of the user will be supported with moderate hardness and softness. A seat is also included, which is connected to the back frame. The back frame provides back support for the user, and the seat provides hip support for the user.

The working principle and use process of the utility model are as follows: the adjustable backrest device, according to the user's body shape, first rotates the width adjustment knob 401 to drive the driving gear 605 to rotate, and then the driving gear 605 drives the slider rack 608 meshing with it to move in width, which can drive the width of the backrest 501 to move, and then drives the height transmission mechanism through the height adjustment knob 402, drives the transmission gear 607 to rotate through the center gear 606, and then drives the height adjustment rack 604 to move in height, which can drive the two backrest plates 501 to move in height, until the height and spacing of the two movable backrest plates 502 match the body shape of the user.

The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims (10)

1. An adjustable backrest device, comprising at least two backrest plates (501), a back frame (1), and an adjustment assembly (2) mounted on the back frame (1), characterized in that the adjustment assembly (2) comprises: a shell and at least two connecting members (3) arranged on the shell, a knob, and a transmission mechanism, the at least two connecting members (3) are respectively connected to the two backrest plates (501), and the knob drives the connecting members (3) to move closer to or farther away from each other through the transmission mechanism. 2. An adjustable backrest device according to claim 1, characterized in that: the transmission mechanism includes a slide groove (602) and at least two slider racks (608), the slider racks (608) are reciprocatingly slidably arranged in the slide groove (602), the connecting members (3) are respectively arranged on the slider racks (608), and a driving gear (605) is provided on one side of the width adjustment knob (401) of the knob, the driving gear (605) is arranged in the slide groove (602), and the upper and lower sides of the driving gear (605) are respectively engaged with the slider racks (608), and when the width adjustment knob (401) is rotated, the driving gear (605) drives the slider racks (608) to move. 3. An adjustable backrest device according to claim 2, characterized in that it also includes a height adjustment rack (604), the height adjustment rack (604) is fixed on the back frame (1), the shell is provided with a slideway, a height adjustment knob (402) and a height transmission mechanism corresponding to the height adjustment rack, the height adjustment rack (604) is arranged in the slideway so as to be movable up and down, and the height adjustment knob (402) drives the shell to move up and down relative to the height adjustment rack (604) through the height transmission mechanism. 4. An adjustable backrest device according to claim 3, characterized in that: the height transmission mechanism includes a height driving gear, the height driving gear is arranged on one side of the height adjustment knob (402) and is engaged with the height adjustment rack (604), and when the height adjustment knob (402) is rotated, the height driving gear drives the shell to move. 5. An adjustable backrest device according to claim 4, characterized in that: the height driving gear includes a central gear (606) connected to the height adjustment knob (402) and transmission gears (607) arranged on both sides of the central gear (606); the transmission gear (607) and the central gear (606) are meshed with each other, and the transmission gear is meshed with the height adjustment rack (604); when the height adjustment knob (402) is rotated, the central gear (606) drives the transmission gear (607) to rotate. 6. An adjustable backrest device according to claim 2, characterized in that the connecting member (3) and the slider are elastically connected, and the connecting member (3) is elastically movable relative to the slider. 7. An adjustable backrest device according to claim 6, characterized in that the connecting member (3) is connected to the sliding block via an elastic connecting member (603) and an elastic connecting nut (610). 8. An adjustable backrest device according to claim 3, characterized in that: the shell is provided with two knob movable pressing plates (609) which are opposite to the width adjustment knob (401) and the height adjustment knob (402), the surfaces of the width adjustment knob (401) and the height adjustment knob (402) are provided with arc-shaped grooves, the knob movable pressing plate (609) is elastic, and the knob movable pressing plate (609) is clamped inside the arc-shaped grooves. 9. The adjustable backrest device according to claim 1, characterized in that the outer portion of the backrest board (501) is covered with a soft cloth cover (502). 10. An adjustable backrest device according to claim 1, characterized in that it also includes a seat, wherein the seat is connected to the back frame, the back frame provides back support for the user, and the seat provides buttocks support for the user.