RU242106U1 - Chair - Google Patents

Abstract

This utility model relates to seating furniture and can be used in both homes and public catering establishments and offices. The purpose of this utility model is to create a collapsible chair structure with increased stability and strength. This utility model is achieved through the proposed chair design, which comprises four legs connected in pairs under the seat, a backrest, two backrest support elements connected behind the backrest, a seat, and threaded fasteners. The backrest support elements and legs are attached crosswise under the seat. 4 pp. 1 fig.

Description

The utility model relates to seating furniture and can be used both at home and in catering facilities and offices.

The current trend in the development of the furniture industry is that chair manufacturers, when entering serial and mass production, at the design stage of the design and development of manufacturing technology, strive to reduce the cost of production by using connecting parts manufactured using universal equipment without the use of special expensive tooling.

At the same time, minimalist design, devoid of any additional elements in the chair's appearance, is becoming increasingly popular. The so-called "loft" style, with its characteristic minimalism and abundance of open space, is becoming increasingly popular.

Thus, the conducted analysis showed that a chair with one supporting element of the back, a rounded back and a seat with soft upholstery and four legs is gaining wide popularity among buyers.

The prototype is the chair presented in the Russian Federation patent for utility model No. 236097 (publication date: July 28, 2025).

The chair comprises four L-shaped legs, two backrest supports, a backrest, a seat, L-shaped backrest supports, and threaded fasteners, with the backrest supports and legs being attached crosswise under the seat.

The analysis showed that the presented design can be modified to increase strength by making changes to the design.

The utility model is aimed at creating a collapsible chair structure with increased stability and durability.

The utility model is achieved through the proposed design of a chair, which contains four legs connected to each other in pairs under the seat, two backrest support elements, a backrest, a seat, the backrest support elements connected to each other in pairs behind the backrest, as well as threaded fasteners, wherein the backrest support elements and legs are fastened under the seat in a crosswise manner.

The four legs and backrest support elements are made of tubular rolled metal of various profiles.

The connection of structural elements to each other is achieved using threaded fasteners.

The increased strength index will be ensured by the design of the chair, in which the configuration of the structural elements.

The cross-shaped arrangement of the leg support parts and the back support parts under the seat will increase strength and stability due to the fact that the support elements will be distributed over the entire area of the lower plane of the seat, which will also allow for a uniform supporting structure.

It is important to note that the backrest support elements are positioned parallel and equidistant from the support portion of the rear legs, which will also increase strength, as the inner part of the seat is known to bear a large load, and this arrangement will allow the chair to withstand additional loads.

This useful chair model also enhances strength and stability through the unique interaction of its structural elements. The legs are connected in pairs under the seat to form a rigid frame, redistributing the user's load between the support points and reducing the risk of individual legs shifting or loosening. Two backrest support elements transfer the force from the backrest load not to a single point, but to two areas of the seat, increasing stability, reducing local stress, and promoting durability. An additional connection between the backrest support elements behind the backrest prevents them from spreading, maintaining stability even under dynamic loads and ensuring the stability and rigidity of the upper section. The use of threaded fasteners ensures a tight fit and the ability to adjust by tightening the connections, preventing play during use and increasing stability and strength. The cross-shaped arrangement of the legs and support posts under the seat creates a reinforced joint, increasing strength and stability, as this design can withstand loads from multiple directions and prevents the seat from twisting around its vertical axis. All together, this results in an even distribution of loads, increased rigidity and increased stability of the chair during use.

The proposed chair design will be collapsible and assembleable thanks to the presence of threaded fasteners.

The seat is made of soft upholstery, has a rounded shape with rounded edges on the back side, and takes on a semicircular shape on the opposite side.

It's also worth noting that the seat and backrest will feature removable covers. The covers will be secured to the seat with Velcro.

The backrest is also upholstered, with an arched shape from above and an oval shape from the front. The cover will be attached to the backrest using a zipper.

The design of the chair provides for the use of armrests, which are attached to the lower plane of the seat and will be located on the sides above the seat on both sides.

The backrest support elements are made from a tubular blank and have an L-shape with a radius of curvature at the bending point.

Fig. 1 shows the external appearance of the chair.

The connection of the chair back to the supporting elements of the back, the supporting elements of the back to the seat, and the legs to the lower plane of the seat is made using a detachable connection (studs, screws, bolts, nuts, etc.).

The seat and backrest are equipped with removable covers that serve as soft upholstery. The covers are secured to the seat with Velcro fasteners that attach to the underside of the seat.

The back has an arched shape when viewed from above and an oval shape when viewed from the front. The cover is attached to the back with a zipper.

The proposed utility model can be implemented in various design variants that do not go beyond the stated formula.

The legs and backrest supports can be made from tubular rolled steel of round, square, rectangular, oval, or other profile cross-sections. The cross-section can be the same for all elements, or different for the legs and backrest supports. A combination of profiles is also possible—for example, with round legs and rectangular backrest supports.

The legs can be the same length or different lengths, allowing for adjustment of the seat height or the tilt of its surface. The legs can be positioned vertically or at an angle to the seat's vertical axis, either outward or inward, with the tilt angle being fixed or variable depending on the design.

The legs under the seat can be connected in pairs using crossbars, spacers, or additional connecting elements, which can be straight, curved, or cross-shaped. These connecting elements can be either rigidly attached or detachable.

The backrest support elements can be straight or curved, connected to each other by a straight crossbar, an arched crossbar, or a system of cross elements located behind the backrest.

The seat can have a rectangular, square, round, oval or other configuration, and the legs and backrest support elements can be attached either at the corners or at intermediate points along the perimeter.

Threaded fasteners may include screws, bolts, studs and nuts, self-tapping screws, or other types of threaded connections. Washers, bushings, specially shaped nuts, or other standard fasteners may be used. If necessary, combined connections may be used, incorporating threaded elements in conjunction with fasteners, inserts, adhesives, or welded spots, as long as the detachability principle is maintained.

The cross-shaped arrangement of the legs and backrest support elements under the seat can be implemented in various configurations: the legs can intersect in pairs at different angles, the axes of the support posts and legs can be shifted relative to each other, and the cross can be located either in the geometric center of the seat or with an offset.

Additionally, the design may include the installation of transverse or diagonal connecting elements between the legs to enhance stability and strength, as well as decorative or protective overlays at the joints.

The presented figures, design description, and use of the chair do not exhaust the possible design variations or in any way limit the scope of the claimed technical solution. Other design variations are possible within the scope of the claimed formula.

The implementation of the proposed utility model allows us to solve the stated technical problem and ensure the achievement of the technical result.

A utility model that has constructive unity implements a common functional purpose (functional unity).

The prior art does not contain an analogue characterized by features identical to all the essential features of the claimed utility model.

The applicant has tested the proposed device, which confirmed its purpose, feasibility and operability, and therefore the claimed utility model meets the patentability requirement of "industrial applicability".

Claims (5)

1. A chair comprising four legs connected to each other in pairs under the seat, a backrest, two backrest support elements connected to each other behind the backrest, a seat, and threaded fasteners, wherein the backrest support elements and the legs are fastened under the seat in a crosswise manner. 2. A chair according to paragraph 1, characterized in that the chair has armrests that are attached to the lower plane of the seat. 3. A chair according to paragraph 1, characterized in that the back and seat have removable covers. 4. A chair according to paragraph 1 or 3, characterized in that a removable cover with a zipper is installed on the back. 5. A chair according to paragraph 1 or 3, characterized in that a removable cover with Velcro is installed on the seat.