LT5759B - Compact chair - Google Patents

Abstract

This invention relates to chairs - special, easy foldable, compact and mobile chair. It not deforms, it can hold relatively big weight (120 kg. or even more). In folded position it takes very little space and is light (1.0 to 1.5 kg). This chair (1)consists of chair seat (2), telescopic pipe-based upper leg (3), connecting sleeve (8), ears (9), axes (10), lower leg (4), cross-shaped connection (12), rod (13), and stretcher (11) made of metal, side stretchers (14) and fastening elements. In unfolded position, this chair (1) takes considerable big space, ensuring comfortable and safe seat. This is achieved by using a special chair construction, which is based on telescopic tubes easy collapsing in to one another and connecting sleeve (8) towhich respectively are fastened upper (3) and lower (4) legs of the chair.

Description

TECHNICAL FIELD

The present invention relates to chairs, in particular compact, mobile, folding, folding, travel chairs, which can be easily folded and placed in a bulky package.

TECHNICAL LEVEL

The chair has long been invented in the world for seating, but over time and as new needs arise, new chairs have been created with new features and exceptional designs.

U.S. Pat. US3674306, published 1972; July 4 This patent describes a compact folding chair with a seat, backrest, seat and backrest joints and four legs. This chair is folding and reminds the diplomat in the folded position: the backrest consists of the seat and the legs fold into the seat hollow. The main advantage of this design is its compactness, but the construction of the chair itself is neither stable nor rigid.

Also known is U.S. Pat. US2009167063, published May 2009 July 2 This patent describes a compact folding chair having legs, each of which is fastened at one end to the seat and at another angle to the annular base. Using two types of axial joints, the legs of an adjacent chair are connected through a central angle at a certain angle, forming an "X" shape. In this way, the center legs are rotated relative to each other, allowing the chair to be folded. The above ring gives the structure stability. However, the weakness of this design is the leg joints: one type of joint is screws and the other is special nipples. When folding / folding the chair, sitting down, sitting down and getting off the chair, the main force acts on these connections, causing the bolts to wear out quickly. A similar situation exists with special nipples, with one foot pressing the nipple to one side and the other to the other. Also, these special nipples have another disadvantage: in the case of folding and folding, the two legs in the nipple must move in immediately different directions, i.e. additional stresses occur inside the nipples: on the one hand, such a chair is very uncomfortable to bend, on the other hand, the nipples receive a relatively high load and are not durable.

U.S. Pat. US4595232, published 1986. June 17 The compact chair described in this patent has a seat, legs and backrest that extends easily into specially prepared cavities near the seat. The front legs are connected to their respective rear legs to form an "X". The chair folds in through the middle of the X-shape and the backrest easily separates from the seat by pulling it out of the above cavity. The design of the leg joints of this chair is quite simple and durable, but the weak point is the attachment of the backrest: even with a slight human recline, the aforementioned seat cavity is subject to very high load (lever principle). As a result, such a chair can be tilted very easily and the sharp ends of the backrest, which can be easily removed, can cause accidental injury.

U.S. Pat. US4184711, published 1980 January 22 The folding chair described in this patent consists of a backrest, a material seat and three legs connected to one another at a distance from the seat approximately in the middle of the seat. When the chair is folded, the legs are positioned at an angle. The big plus of this chair is that when folded it takes up very little space, in practice it's just three bars with some extension in the middle. However, the chair cannot withstand heavy weight and the leg protrusion is not continuous. When the chair is folded, the plane of the seat is usually not horizontal. Another disadvantage of such a construction is that the joining of the bars to the material covers a very small area, which makes such a chair long-lasting.

Closest to the state of the art is American patent no. US4826241, published 1989 May 2 This patent describes a folding chair based on left and right A-shaped frames. Each A-shaped frame consists of two legs which are connected to their upper ends through an axis. The crossed straps are connected through the axle to the A-shaped legs with the lower ends of the straps and secured to the upper part of the legs by means of special lugs. The seat and backrest are connected to one another via the axle. The chair is folded very easily by lifting it behind a special joint, the ends of which are attached to the upper parts of the legs. However, the chair is not easily folded out because it has a wide variety of joints and additional joints that need to be properly positioned when folding the chair. In this construction, the joints at the bottom, which connect the A-frame frame to the X-shaped auxiliary rods, are extremely unstable. Due to the A-shaped design, the contact area of the seat with the feet is very small, which can easily tear the seat.

THE SUBSTANCE OF THE INVENTION

The object of the present invention is a specially designed folding compact chair which easily maintains a high weight (120kg or more) without deformation, and when folded takes up very little space (1.5-2.0 bottles of mineral water) with little leverage (only 1.0-1.5 kg), folds up to a fairly large area, is comfortable to sit on, easily and conveniently folds in and out. This is achieved by the use of a special chair design, which is based on telescopic tubes, which are easily slid into one another, and a connecting sleeve, to which the upper and lower legs of the chair are attached respectively.

An essential feature of the present invention is that such an extremely compact folding chair is very stable when folded, retains relatively high weight and does not deform.

BRIEF DESCRIPTION OF THE DRAWING FIGURES

FIG. 1 shows the construction of this folding chair (side view, more from the top).

FIG. Figure 2 shows the construction of this folding chair (side view, more from below).

PREFERRED EMBODIMENTS

Folding, foldable and similar compact chairs based on the seat, the legs, and sometimes the backrest are known to be common in the world.

FIG. 1 depicts a compact chair (1) having a seat (2), legs (3, 4), and fasteners.

The seat (2) of this compact chair (1) consists of a square resilient solid material (5), the ends of which are secured to the chair frame fastening elements (6). Also, the seat material (5) is additionally reinforced with diagonals and with straps (7) sewn at the edges. At best, the seat material (5) is made of cordura material and the straps are made of capron.

The upper legs (3) of the chair, which are based on telescopic tubes, are attached to the bottom of the chair frame fastening elements (6). They consist of telescopic tubes, which slide easily into each other and thus reduce the construction dimensions when folded. Telescopic tubes can be of any shape: round, square, trapezoidal, triangular and other. The upper legs (3) of the chair, made of Π-shaped profile, further (like the sides of the pyramid) enter into a connecting unit, which function is performed by a special sleeve (8).

The corresponding parts of the upper legs (3), which are based on telescopic tubes, can slide out of one another and slide into each other. This reduces the length of the upper legs (3) of the chair when folded. When the telescopic tubes are fully extended by the use of cylindrical outward / outward catches, they lock together to form a rigid composition where the square seat material (5) also acts as a stretcher.

Attached to the sides of said bushing (8) are tabs (9), two tabs per leg. These lugs (9) have drilled holes and axles (10) mounted thereon, on which the lower parts of the upper legs (3) are fixed. Such an attachment of the upper legs (3) to said jvore (8) allows them to bend in parallel to one another.

Also, the lower chair legs (4) are attached to the said lugs (9) from below, which are similarly extended downwards at a certain angle to the sides of the pyramid. Attached to the lower parts of the lower legs (4) are metal tensioners (11) which connect them and form a cross-shaped joint (12). This cross-shaped joint (12) has a hole in the center into which a rod (13) is inserted at the lower end. The upper end of said rod (13) is secured to said sleeve (8). Due to this connection of the rod (13), the lower legs (4) fold and fold out simultaneously as umbrella spokes.

The upper legs (3), lower legs (4), sleeve (8) and rod (13) form the frame of the chair (1). This frame is made of profiled duralumin, hard metal or plastic, or other material of similar strength. It can also be made of composite materials (composites).

In order to make the chair (1) even more robust and stable, four side tensioners are attached to the respective chair frame fastening elements (6), which are attached at the other corresponding ends to the lower parts of the lower legs (4). The side tensioners (14) are made of an elastic solid material, such as a capron strap, a cord and the like. The side stretchers (14) can also be made of solid material, as it is technically easy to ensure that they will bend during the folding of the chair. Also, these side tensioners (14) can be self-assembling, which facilitates folding and unfolding the chair.

This compact chair differs from other chairs of this type in that it takes up very little space when folded. Therefore, it can be placed in any bag, backpack or even attached to a belt.

On the other hand, when folded, it has normal dimensions for the chair, both in width and height. Ideally, the chair has an area of approximately 460x460 mm ² , and the height from the floor to the chair frame fasteners (6) is approximately 460mm. The height of the chair from the floor to the center of the chair seat (2) is slightly lower and is approximately 340mm at best.

Although this chair (1) weighs only 1.5kg, its design allows it to easily maintain 120kg. The upper (3) and lower (4) legs of the chair provide the required stability. With lighter materials, the weight of the chair can be further reduced by at least 30%.

FIG. 2 shows the same design of the folding chair, but more from below to allow better visibility of its harder-to-see knots

Claims (6)

DEFINITION OF INVENTION 1. A compact chair with a seat, legs and anchors, characterized in that it consists of: - square chair seats made of a resilient material (5), the ends of which are secured to the chair frame fastening elements (6), wherein the seat material (5) is secured to the diagonals and fastened at the edges (7); - upper legs based on Π-shaped telescopic tubes, which are easily slid into one another, where their respective upper ends are fastened to the chair frame fastening elements (6) and the lower ones enter into the connecting unit, which is provided by a special bushing (8); - lower legs having their respective upper parts secured to a special bushing (8) and their respective lower parts extending downwards at a certain angle; - side tensioners, the upper ends of which are attached to the chair frame fastening elements and the lower ends of which are attached to the lower parts of the lower legs (4); - metal tensioners which connect the lower parts of the lower legs (4) and form a cross-joint (12). - a rod (13) connecting the center of the cross-shaped joint (12) with a special bushing (8); wherein the special sleeve (8) is provided, by means of axles (10), with lugs (9) to which the lower parts of the upper legs (3) and the upper parts of the lower legs (4) are respectively fastened so that they can fold parallel to each other with respect to. A compact chair according to claim 1, characterized in that its seat (2) is made of a rigid elastic material, preferably the seat material is made of cordura material and the straps are made of a capron. Compact chair according to claims 1-2, characterized in that the telescopic tubes are of any shape: round, square, trapezoidal, triangular, polygonal and the like. 4. A compact chair according to claims 1-3, characterized in that the chair body consisting of upper legs (3), lower legs (4), sleeve (8) and a bar (13) is made of profiled duralumin, hard metal or plastic, composite materials. A compact chair according to claims 1-4, characterized in that the side stretchers (14) of the chair are self-assembling. 6. A compact chair according to claims 1-5, characterized in that the side stretchers (14) and the metal stretchers (11) of the chair are made of an elastic solid material, e.g. capron strap, cord, and the like.