RU2448630C2 - Folding chair - Google Patents

Abstract

FIELD: personal use articles.

SUBSTANCE: invention relates to production of furniture, namely, the manufacture of folding devices for sitting. Folding chair consists of two frames forming the frame of the chair, each of which includes two curved lateral elements connected with each other with the upper cross members which are connected with the means that forms in the working position of the chair its seat and back, and made flexible in the middle part. Each frame is equipped with an additional cross bar connecting the lateral elements of the frame in its middle part, and made with an ability of bearing impact on the side elements of the other frame. Additional cross members are connected to the means forming the seat and back, so that the flexible part of this means is located between the said additional cross members and connects them with each other.

EFFECT: provision of a more convenient location of the user on the folding chair.

6 cl, 8 dwg

Description

FIELD OF THE INVENTION

The invention relates to the manufacture of furniture, namely to the manufacture of folding devices for seating, which are folding chairs or deckchairs, which are compact when folded and have the ability to deploy to a working position anywhere. The predominant use of the proposed solution is its use in the manufacture of folding chairs intended for cottages, open verandas or other places of rest.

State of the art

A known solution to a folding chair (see patent RU No.2019986, IPC A47C / 04, publ. 09/30/1994) containing wooden parts: a seat, a back with side legs forming the front legs, rear legs connected to each other by metal rods, the ends of which are fixed in the holes of the parts mentioned and have annular grooves through which the fixing pins pass.

The disadvantage of the above solution is the low consumer properties of the product, since the design of the chair does not take into account ergonomic requirements, the chair is not comfortable to use, and the manufacture of dissimilar materials (wood and metal) and the need to manufacture special metal fittings complicates the production technology of such products.

Folding chairs and armchairs are widely known, the basis of the design of which are two frame elements intersecting each other, forming: one element - the front legs and the supporting part of the back; the second element is the rear legs and the frame part of the seat.

Known folding chair containing placed cross-small and large frames that form the frame of the chair, and stretched on this frame flexible canvas. For structural stability, the said frames in the area of the legs are interconnected by pair ties (see patent FR No. 2594664, IPC A47C 4/40, publ. 08.28.1987).

A similar design has a folding portable chair described in patent RU No. 2118503 (IPC A47C 4/38, A47C 5/10, publ. 09/10/1998). This chair is made of cross-placed small and large frames, forming its frame, and a flexible canvas connected to the frames and forming a seat and back in the working position of the chair. The large frame consists of articulated upper and lower links. The above frame made of frames is equipped with pair ties, of which the upper couplers connect the frames above the point of intersection and form the armrests of the chair, and the lower pair of couplers connect the same frames in the area of the legs of the chair.

The main disadvantage of the solutions described above is that the flexible web forming the seat and back in the working position of the product does not have the necessary rigidity. A person sitting in such a chair is in a reclining position, and the need to turn or stand is accompanied by certain difficulties due to the lack of support required when changing the position of the side of the canvas. However, products of this design do not look quite presentable. Most often, the frame of such chairs and deck chairs is made of aluminum tubes, which ensures a low weight of the product as a whole, and determines their use as camping furniture, or as a beach deck chair. However, the use of such products as country furniture or furniture for relaxing on the open veranda or in a country house is not widespread, both in connection with the above-described inconveniences in the operation of such products, and in connection with their insufficiently attractive appearance.

A known design of a folding chair (see patent for utility model, No. 61102, IPC A47C 4/20, publ. 10/17/2006), containing a support base, consisting of two intersecting pairs of arcuate, made of metal tubes legs, turning into supports for the back and seats. The rigid seat and back fixed to the support base provide support functions when using the product. However, as well as the above-described folding chairs and armchairs with a metal frame and flexible canvas, this product is characterized by low consumer qualities, lack of comfort when using them.

As a prototype of the claimed invention, the decision of the deck chair is presented in the patent for utility model RU No. 28429 (see patent RU No. 28429, IPC A47C 4/24, publ. 03/27/2003, figure 2). This decision was taken as a prototype, since the design of the specified chaise lounge coincides with the claimed solution for the largest number of design features.

The prototype is characterized by the presence of two parallel located and interconnected beams of curved structural elements that form the front legs, turning into a support for the back. Two other elements, also parallel to each other, and connected to each other, forming the rear legs and the support part for sitting, intersect with the mentioned elements. A flexible web is fixed on the crossbars to form the seat and back in the working position of the deck chair.

The disadvantages of the prototype are:

- insufficient rigidity of the seat and back of the product for the support function;

- a low degree of comfort of the product during its operation;

- low consumer properties, in particular, low aesthetic indicators, which determines its use only as tourist equipment, and does not provide attractiveness for use as furniture for cottages and other places of recreation.

Disclosure of invention

The claimed invention solves the problem of creating a folding chair, characterized, while maintaining the property of transformation and small dimensions in assembled form, the following qualities of the product in its working position: high aesthetic indicators; comfort; sufficient elasticity of the seat and back, which determines the presence of proper supporting qualities and increased ease of use of the chair; reliability during operation; low cost of production and manufacturability in the manufacture.

The problem is solved due to the fact that in a folding chair containing cross-mounted two frames forming a chair frame, each of which includes two curved side elements connected by upper cross members connected to a means forming its seat and back in the working position of the chair and made in the middle part flexible, according to the claimed invention, each of the said frames is provided with an additional cross member connecting the side elements of this frame in the middle part and made with possible the support action on the side elements of the other frame, while the additional cross members are connected to the means forming the seat and back, so that the flexible part of this tool is located between these additional cross members and connects them together.

As noted above, the side elements are curved. In this case, the preferred embodiment of the product is one in which additional cross members connect those sections of the side frame elements that are located near the inflection line of the corresponding side element and in its part forming the leg of the chair. Since the inflection line is a weakened section of the element, and the additional cross-beam carries the main load, the installation of additional cross-bars with their fastening in the sections behind the bending line and from the legs leads to the fact that the load is more directed to the supporting lower part of the product and is minimal in the bending zone side element. Additional cross members are fixed on the rear faces of the side elements and are made longer than the width of the frame supporting them, i.e. the ends of the additional cross members extend beyond the frame supporting this additional cross member. These ends in the working position of the chair are supported on the outer edges of the side elements of another frame, which ensures a stable position of the product in its expanded state. When folding the chair, the additional crossbars installed in this way are on the outside and do not prevent the frames from coming closer together.

The tool forming the seat and back of the chair is formed from a cord. For tensioning the cord and forming a web from it, the upper and additional cross members of both frames are made with rows of holes. The canvas from the cord, forming the seat and backrest, is created by passing the cord sequentially through the holes of the cross members, while a lacing stretched along parallel lines is formed in the planes of the seat and back. Such a fabric has a certain elasticity, a sufficient supporting effect is provided, and at the same time, the properties of the cord, synthetic rope, predetermine the fact that the cord fabric is slightly stretched.

At the same time, it is possible to execute a chair in which only a part, namely a section between the additional cross members, is made of a flexible web to ensure the chair is transformed into an assembled state. In this case, the sections forming the seat and back can be made on the basis of rigid elements, each of which is fixed with one edge on the upper cross member of the corresponding frame, and the opposite on the additional cross member of the same frame.

It is rational to design a chair in which the bending of the side elements is characterized by an angle between the conditional center lines of the lower and upper parts of the side element ranging from 135 to 165 degrees. The preferred option is the design of the chair, in which said angle is -150 degrees.

The most technologically advanced is the production of a chair, in which the side element is formed from two bars connected by an adhesive method and with the butt ends of the bars joined by a gear joint.

Brief Description of the Drawings

Figure 1 presents a General view of a folding chair in isometry;

Figure 2 - folding chair in working position, side view;

Figure 3 is the same, top view;

Figure 4 is a view A in figure 2;

Figure 5 is a view of the chair in an assembled state, side view;

Fig.6 is a view of B in Fig.5;

Fig.7 is a photograph of a General view of the product made on the basis of the claimed invention, while the folding chair is presented in working condition;

Fig - the same, the chair in the folded state.

The implementation of the invention

A preferred embodiment of the claimed invention is the implementation of a folding chair made of solid wood and with a tool that forms the back and seat, in the form of a flexible fabric woven from a cord (synthetic rope). The fabric woven from the cord has shock-absorbing properties, while providing the necessary supporting effect.

The chair contains two frames (indicated by positions 1 and 2 in the drawings) of different sizes in height and width, so that the lower part of one frame (in the drawings - frame 2) has the ability to cover the lower part of another frame (in the drawings - frame 1). Frame 1 is larger in height and smaller in width and forms the frame of the back of the chair and its front legs. Frame 2 forms a frame for the seat and rear legs of the chair and has a height dimension (including the height of the frame when the chair is folded), smaller than frame 1, but frame 2 is wider than frame 1. Two frames 1 and 2 together form a chair frame and, in its working condition, these frames cross each other. Each frame includes two curved side elements indicated in the drawings, pos. 3 for frame 1 and pos. 4 for frame 2, interconnected by upper cross members 5 and 6. In addition to the upper cross members, each frame is equipped with an additional cross member: frame 1 - cross member 7, frame 2 - cross member 8. Different widths of frames 1 and 2 ensure their installation by a crosshair, i.e. the part of the frame 1, forming the front legs of the chair, is placed between the side elements of the frame 2. The frames 1 and 2 are connected to a means forming its seat and back in the working position of the chair. As such a means, a flexible cloth commonly used for deck chairs can be used. On the drawings attached to the description, a chair is presented, in which the said tool forming the seat and back of the chair is formed by a cord 9, repeatedly passed through the cross-members in the sequence: 5-7-8-6, and back 6-8-7-5, with the formation parallel stretched, like strings, sections of the cord between the side elements of the frames. To form a “web” by means of a cord 9, the upper cross members 5 and 6 and the additional cross members 7 and 8 each have rows of holes 10.

Additional frame cross members are fixed on the side elements in areas directly behind the bend of the corresponding side element, i.e. additional cross members 7 and 8 connect the sections of the side elements of the frames located near the inflection line and in the part forming the legs of the chair. Additional crossbars are fixed on the rear faces of the side elements and are made longer than the width of the frame supporting them. The ends of the additional cross members protruding beyond the frame carrying this additional cross member, in the working position of the chair, are supported on the outer edges of the side elements of the other frame.

The inventive folding chair is made as follows. Each side element is made of two pieces of wood, turned to the desired shape, connecting them together at an angle by glue, and for a more durable connection of these pieces use a gear connection, the technology of which is known from the prior art. Two side elements are connected by the upper and additional cross members, receiving the product frame. By setting the frames cross-wise and connecting them with the means forming the seat and back (flexible cloth), the finished product is obtained. In this case, a flexible web of cord is created as follows. The seat and back are formed by successively passing the cord from the upper cross member 5 of the frame 1 to the additional cross member 7 of the same frame 1, then passing through the corresponding hole of the cross member 7 and wrapping the cord around it, pull the cord to the additional cross member 8 of the frame 2, from this cross member 8 the cord 9 lead to the upper cross member 6 of the frame 2, and passing the cord 9 sequentially through two holes of the cross member 6, the weaving of the web from the cord continues to be formed by passing the cord 9 from the cross member 6 to the additional cross member 8 of the frame 2, from it to the additional an additional cross member 7 of the frame 1, and then to the upper cross member 5 of the frame 1, where, passing the cord through the two holes of this cross member 5, the cycle of forming the web from the cord is repeated. These cycles are repeated until the parallel sections of the cord 9 are completely filled with the entire space between the side elements of the frames 1 and 2 until the working surface of the chair seat, its back and flexible connection between the additional cross members 7 and 8 of the frames 1 and 2 are formed. It is this flexible connection ensures that frames 1 and 2 are interconnected, i.e. the frames are connected by a flexible connection between the additional cross members, which ensures the integrity of the product, and also ensures that the chair is folding. If, when forming the seat and backrest from the cord 9, the size of the segments of the cord 9 placed between the additional cross-beams 7 and 8 is made smaller, then the back and front legs will move together, and the seat of such a chair will be higher. That is, the claimed solution allows you to adjust the position of the back and chair in the product, and in the manufacture of the product using the proposed solution to produce its different options: a chair with a back close to vertical, with small lengths of cord 9 between the additional cross members, and, therefore, a small distance between cross members 7 and 8; and on the contrary, a chair close to a deck chair, with enlarged lengths of cord 9 between the additional cross members, which are also spaced apart from each other more than for a chair with a moderate inclination of the back.

The finished chair is displayed in the working position as follows. When the upper crossbeams of the frames are moved along horizontal lines and in opposite directions, the cord is pulled, the legs of each frame move, the protruding ends of the additional crossbars of one frame abut against the side elements of the other frame, and the chair is set in a stable position.

To transfer the chair to the inoperative position, it is necessary to move the back and seat to each other, acting on the upper crossbars of the frames. When moving the frames, the additional cross members are removed from the position of their contact contact with the side elements, the frames are rotated and held next to each other due to the flexible connection between the additional cross members.

The device has a simple design, the translation of a folding chair from a working position to a non-working position, and vice versa, is carried out with minimal effort. The manufacturing technology of the chair is characterized by simplicity. The reliability of the chair and its convenience, comfort during operation of the product, while the chair has a presentable appearance. You can use soft pillows that will be well fixed relative to the braided lacing.

Claims (6)

1. Folding chair, containing two frames forming the frame of the chair, each of which includes two curved side elements interconnected by upper cross members connected to a means forming in the working position of the chair its seat and back and made flexible in the middle part, characterized in that each of the said frames is equipped with an additional cross member connecting the side elements of this frame in its middle part and made with the possibility of supporting action on the side elements of another frame, while additional its cross members are connected to the means forming the seat and back, so that the flexible part of this means is located between the aforementioned additional cross members and connects them together. 2. The chair according to claim 1, characterized in that the additional cross members connect the sections of the side elements of the frames located near the inflection line and in the part forming the legs of the chair, mounted on the rear faces of the side elements and made with ends protruding outside the frame that carries this additional cross-member, and supported in the working position of the chair on the outer edges of the side elements of another frame. 3. The chair according to claim 1 or 2, characterized in that the upper and additional cross members are made with rows of holes, while the means forming the seat and back are formed from a cord sequentially passed through the openings of the cross members with the formation in the planes of the seat and backrest stretched along parallel lacing lines. 4. The chair according to claim 1 or 2, characterized in that the means forming the seat and back include three sections, of which the section between the additional cross members is made of flexible fabric, and the sections forming the seat and back are made on the basis of rigid elements, each of which is fixed with one edge on the upper cross member of the corresponding frame, and the opposite - on the additional cross member of the same frame. 5. The chair according to claim 1, characterized in that the bending of the side elements is made with the formation of an obtuse angle between the conditional axial lines of the lower and upper parts of the side element in the range from 135 to 165 °. 6. The chair according to claim 1 or 5, characterized in that the side element is formed of two bars connected to each other at an obtuse angle by an adhesive method and with the butt ends of the bars joined by a gear connection.

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