A type of seat back

Abstract

This utility model relates to the field of office and home furniture, and provides a chair backrest. The chair backrest includes a support member mounted on a backrest frame. The backrest frame consists of two metal plates perpendicularly arranged along the seat direction. The metal plates are fixed together by welding together horizontally curved plates. The backrest frame includes a helical mechanism consisting of a first nut, a second nut, and a second screw installed in the first nut. The second nut contacts the horizontally curved plate. By rotating the second screw, located perpendicular to the support plane, relative to the first nut fixed between the two support plates, the position of the support member fixed to the horizontally curved plate via the helical connection can be adjusted. This technological achievement aims to create a rigid chair backrest with adjustable component positions, preventing lateral tilting and ensuring maintainability.

Description

Technical Field

[0001] This utility model relates to the field of office and home furniture, and provides a chair back that can provide comfort for long-term computer users and prevent musculoskeletal diseases. Background Technology

[0002] An ergonomic chair with individual adjustable back support (RU 197561 U1, IPC A47C 1 / 022, published May 13, 2020) is known, comprising a seat and a backrest mounted on a support base, the seat and backrest being composed of a set of support elements arranged in a predetermined interval sequence, and the support elements of the backrest being individually movable, characterized in that: the support base may be in the form of a single component, the seat and backrest forming a unified integral structure composed of support elements, the support elements being made into a curved shape with individual embossed surfaces, which can perfectly conform to the user's body and have an orthopedic effect.

[0003] The disadvantages of this device are that it is complicated and inconvenient to operate, and it is prone to tilting to one side.

[0004] A chair with a backrest is known, consisting of movable mechanical segments supporting the user's back, neck, and head (RU2610417 C2, IPC A47C 7 / 46, B60N 2 / 64, B60N 2 / 42, B60N). (Published on February 10, 2017, February 24) consists of more than one hundred independent rectangular segments, each rigidly fixed to a rod that freely immerses itself in and extends from the inner cavity of the backrest. The rod is secured in one or more positions via a ratchet mechanism, allowing the backrest to adapt to the natural curves of users of different heights, body types, neck curvatures, and head positions. The user is positioned within the recessed sections, remaining in its original state or with minimal immersion in the curved portion of the backrest that provides lateral and longitudinal support to the user's torso, neck, and head, reducing excessive strain on the spine, shoulder joints, and the entire upper body. The user can then be moved to a more comfortable position and pulled by a special handle, adjusting the components to reshape the body into a unified form that conforms to the user's body curves, thus enveloping the body in a unique and comfortable "shell."

[0005] The drawbacks of this device are its complexity and bulky structure.

[0006] A chair is known (https: / / artobject.ru / kresla_2 / rabochee-kreslo-ds-2100-de-sede / ), whose backrest and seat are formed by a portion fixed to a tube running from top to bottom through the center of the chair.

[0007] The drawback of this device is that the tension of individual components cannot be adjusted.

[0008] The technical task was to create a backrest that was anti-tilting, inexpensive, had easily adjustable components, and was easy to maintain. Summary of the Invention

[0009] The present invention aims to achieve the technical achievement of a chair back with a rigid structure, wherein the positions of each component of the chair back are adjustable, which can prevent lateral tilting and ensure its maintainability.

[0010] This technological achievement is realized through a seat backrest composed of two metal plates vertically positioned along the direction of the seat, welded together by a horizontally positioned plate. A helical mechanism, comprising two nuts—a first nut and a second nut—is installed on the horizontal plane between the vertical metal plates. The second nut contacts the horizontally positioned plate, while the first nut is fixed between individual wooden planks. A second screw, installed in the first nut, is used to adjust the position of these individual planks, which are helically connected to the horizontally positioned plate, thereby achieving positional adjustment relative to the vertical metal plates. Attached Figure Description

[0011] Figure 1 The structure of the chair back is shown from the rear side. Detailed Implementation

[0012] The essence of this utility model will be explained by the accompanying drawings of specific embodiments of the backrest. Figure 1 The structure of the backrest is shown from the rear side.

[0013] The chair back includes a fixing assembly 1, a backrest frame 2, and a support member 3 mounted on the backrest frame 2. The backrest frame 2 consists of two metal plates 4, which are welded together to a curved plate 5. The backrest frame 2 includes a screw mechanism consisting of a first nut 10, a second nut 11, and a second screw 9 installed in the first nut 10. The support member 3 consists of a support plate 6 and a support plate 7. The support member 3 is fixed to the curved plate 5 by a first screw 8. The position of the support member 3 relative to the curved plate 5 is adjusted by moving the second screw 9 in the first nut 10 and is fixed by the second nut 11.

[0014] The backrest frame 2 is made of two metal plates 4, which are arranged vertically and spaced apart, and welded together by a bent plate 5 to ensure structural rigidity and prevent lateral tilting. Furthermore, securing the support member 3 to the bent plate with a first screw 8 reduces manufacturing costs and allows for repair in case of wear or damage to individual components of the support member 3.

[0015] In the current embodiment, support plates 6 and 7 are made of wood, but can also be made of plastic or metal and covered with soft furnishings. The construction of the composite support allows a first nut 10 to be set and secured between support plates 6 and 7, and the position of support member 3 can be adjusted by rotating a second screw 9 perpendicular to the support plane and located between metal plates 4. This component form simplifies the process of adjusting the position of support member 3, and also reduces the cost of the structure and makes it maintainable.

[0016] The proposed seat back design with adjustable backrest support elements is anti-tilt, while being low in manufacturing cost, easy to adjust the position of individual elements, and maintainable.

Claims

1. A seat backrest, comprising a support member disposed on a backrest frame, characterized in that: The backrest frame consists of two metal plates arranged vertically along the seat direction. The metal plates are fixed together by welding together a horizontal curved plate. The backrest frame includes a spiral mechanism consisting of a first nut, a second nut, and a second screw installed in the first nut. The second nut contacts the horizontal curved plate. By rotating the second screw located in the direction perpendicular to the support plane, the position of the support member fixed to the horizontal curved plate by the spiral connection relative to the curved plate can be adjusted.

2. The seat backrest according to claim 1, characterized in that, The support panel is made of wood.

3. The seat backrest according to claim 1, characterized in that, Its support plate is made of plastic.

4. The seat backrest according to claim 1, characterized in that, Its support plate is made of metal.

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