Chair backrest with adjustable back support segments

Abstract

The utility model relates to the field of office and domestic furniture, and more particularly to devices for creating comfort during prolonged sitting at a computer and for preventing musculoskeletal disorders. A chair backrest with individual positionally adjustable supports comprises a backrest framework consisting of two metal plates which are oriented in the vertical direction of the chair and have curved plates welded thereto, said curved plates having supports fastened thereto for supporting the back. The position of a support is adjusted by turning a screw relative to a nut fastened between plates of the support.

Description

[0001] Manual transmission A47S 7 / 46

[0002] The back of the chair has adjustable segments that support the back

[0003] The utility model relates to the field of office and home furniture, namely to devices for creating comfort during prolonged work at a computer and for the prevention of diseases of the musculoskeletal system.

[0004] An ergonomic chair with individual adjustment of the user's back support is known (RU 197561 U1, IPC A47C 1 / 022, published on 13.05.2020) comprising a seat and a backrest equipped on a supporting base, made in the form of a set of support elements sequentially placed at a given interval, wherein the support elements forming the backrest are made with the possibility of independent movement, characterized in that the supporting base is made in the form of a single part, the said seat and backrest of which form a unified integral structure of support elements made in a curved shape with the formation of an individual relief surface, providing anatomical coverage of the user's body with the manifestation of an orthopedic effect.

[0005] The disadvantage of this device is its complexity and inconvenience in operation, as well as its tendency to tilt to the side.

[0006] A chair with a backrest is known, consisting of movable mechanical segments supporting the back, neck and head of the user (RU 2610417 C2, IPC A47C 7 / 46, B60N 2 / 64, B60N 2 / 42, B60N 2 / 24, published 10.02.2017) consisting of more than a hundred individual segments in the form of rectangular parallelepipeds, each of which is rigidly fixed on a rod, freely immersed in the internal cavity of the backrest and extending from it, fixed in one position or another by a ratchet mechanism, due to which the back of the chair is transformed to suit the natural curves of the bodies of users of different heights, different builds, different neck curves, different head positions, and as a result of which the person ends up in a depression formed from the pressed-in segments, and the segments remaining in the original state or less immersed in the back of the chair form a kind of elastic corset that provides horizontal and vertical support to the user's torso, neck, and head, relieving excess strain on the spine,shoulder joints and the entire upper body, which can be moved to a more comfortable position if desired, after which a special handle is pulled, and the segments that come into motion will again create a single relief, repeating the curves of the user's body, and again enclose the person in a kind of comfortable "shell".

[0007] The disadvantage of this device is its complexity and bulky design.

[0008] There is a well-known chair (https: / / artobject.ru / kresla_2 / rabochee-kreslo-ds-2100-de- sede / ) whose back and seat are formed by segments fixed to a pipe running through the center of the chair from top to bottom.

[0009] The disadvantage of this device is the inability to adjust the tension of an individual element.

[0010] The technical challenge is to create a backrest that is resistant to lateral distortion and at the same time inexpensive, with easy adjustment of the position of individual elements, and also easy to repair.

[0011] The claimed utility model is aimed at achieving a technical result consisting of creating a chair back of a rigid structure with an adjustable position of individual elements, preventing the possibility of lateral distortions, while simultaneously ensuring its maintainability.

[0012] The technical result is achieved by a chair back consisting of two metal plates, vertically oriented in the direction of the chair, fixed to each other by means of a welded connection with horizontally oriented plates, on which, between the vertically oriented plates, a screw mechanism is installed in a horizontal plane, consisting of two nuts, one of which is in contact with the horizontally oriented plate, and the second is fixed between the wooden plates of individual segments, and a screw installed in them, which regulates the position of these individual segments, fixed to the horizontal plates by means of a bolted connection, relative to the vertically oriented plates.

[0013] The essence of the utility model is explained by drawings of a specific example of the implementation of the backrest, where Fig. 1 shows the design of the backrest from the back and side, and Fig. 2 shows a photo of an analogue.

[0014] The back of the chair includes a fastening unit 1, a back frame 2, and supports 3. The back frame 2 consists of two metal plates 4 connected to each other by welding through curved plates 5. Support 3 consists of a support plate 6 and a support plate 7. Supports 3 are secured to curved plates 5 by screws 8. The position of supports 3 relative to curved plates 5 is adjusted by moving screw 9 in nut 10 and is fixed by nut 11.

[0015] The backrest frame 2 is constructed from two metal plates 4, vertically aligned with the seat and spaced apart, and welded together via curved plates 5. This provides structural rigidity and prevents lateral distortion. Attaching support 3 to the curved plates with screws 8 also reduces manufacturing costs and makes it repairable in the event of wear or breakage of individual support elements.

[0016] In the current design, support plates 6 and 7 are made of wood, but they can also be made of plastic or metal and upholstered. The composite design of the support allows for the placement and fastening of nut 10 between support plates 6 and 7. Nut 10 is then used to adjust the position of supports 3 by turning screw 9, which is positioned perpendicular to the support plane and between metal plates 4. This design also simplifies the adjustment of supports 3, reduces the cost of the structure, and makes it repairable.

[0017] The proposed design of a chair back with adjustable back support elements is resistant to lateral distortions, while being inexpensive to manufacture, easy to adjust the position of individual elements, and repairable.

Claims

Utility model formula 1. A chair backrest comprising separate supports placed on a backrest frame, characterized in that the backrest frame consists of two metal plates vertically oriented in the direction of the chair, secured to each other by curved horizontal plates by means of a welded joint, wherein the backrest frame comprises a screw mechanism consisting of two nuts and a screw installed in them, one of the nuts is in contact with a horizontally oriented curved plate, while relative to the curved horizontal plates, by rotating a screw located perpendicular to the plane of the supports, relative to a nut fixed between the plates, the position of the supports secured to the curved plates by means of a screw connection is adjusted 2. The back of the chair according to paragraph 1, characterized in that the support plates are made of wood material.

3. The back of the chair according to paragraph 1, characterized in that the support plates are made of plastic.

4. The back of the chair according to paragraph 1, characterized in that the support plates are made of metal.

5. The back of the chair according to paragraph 1, characterized in that it is made according to one of the specified options or a combination.

Images