FI92551B - Backrest - Google Patents

Description

! 92551

Back

The invention relates to a backrest for a chair, armchair, seat or the like, comprising two side-mounted backsheets corresponding to the support surfaces of a saddle saddle, which are formed concave and horizontally transverse to the transverse axis with respect to a substantially perpendicular axis to the seat surface.

10 For chairs, car seats and armchairs, backrests are already known which, when seated by means of side projections, join the armpit and reduce the load on the spine (DE patent 12 82 264). In addition, such car seats have been developed as pivoting 15 (DE patent application 20 49 666), whereby they pivot automatically when seated.

However, not all of these backrests came into use because they were too expensive to manufacture and not comfortable enough to use.

In addition, it is known that backrests with a seat part are designed (EP patent application 89908181.4) in such a way that they always support the person concerned, regardless of his body shape, which is particularly important in cars, since the backrest must also withstand lateral forces.

It is an object of the present invention, instead, that a backrest of the above-mentioned type receive not only these lateral forces but also other loads applied to it. The durability of the backrest in use, and in particular the durability of the elastic parts of the backrest, is also sought to be improved.

This is achieved by a backrest characterized in that the backrests are attached approximately transversely from the center to a transverse rail behind them by one or more rubber parts so that the interfaces between the rubber parts and the power-transmitting metal corners or metal U-pieces are horizontal or almost horizontal.

The back parts according to the invention last for a relatively long time in use because relatively single parts are used.

The invention will now be described, by way of example, with reference to the accompanying drawings.

Figure 1 shows a horizontal section of a backrest according to the invention.

Figure 2 shows diagrammatically and on a reduced scale a backrest according to the invention attached to a chair.

Figure 3 shows a side view of the details of the connection between the back and the transverse rail.

In Figures 1 and 2, the seat surface is indicated by the reference number 4. A backrest or support rail 120 extends upwards from the seat surface 4, in which case it may be, for example, one approximately horizontal part.

Attached to the support rail 120 shown in Fig. 2 is a transverse rail 20 to which the two back portions 1 are again attached to each other. This is the basic structure associated with both the present and the backrests of the present invention.

The structure according to the invention is most accurately seen in Fig. 25, in which two angle irons 30 and 31 attached to the back part 1 are connected from their horizontal or almost horizontal surface to rubber parts 32. These rubber parts 32 are in turn connected to angle or U-bars 33 in an almost horizontal plane. 33 is fixed to the transverse rail 120. In this construction, the substantially perpendicular forces applied to the backrests of the backrest as the seated person rests on the rubber parts only create compression, thus avoiding shear stress detrimental to the rubber. The support part 120 is made so wide that the gap between the back parts 1 is completely covered.

Il 3 92551

In order to eliminate injuries which may occur when hands are trapped between separate functional parts, such parts may have a common upholstery around them, giving the further advantage that a person sitting in a chair with a backrest according to the invention is protected from traction. Foam can be used as the cladding, which is preferably around all the functional parts.

In vehicles, it is furthermore advantageous that the lateral movement of the back parts 10 1 is limited in their upper area. This can be achieved with rubber buffers (not shown) placed in the outer area of the back parts 1.

In a manner similar to supporting the waist, the head of a person in the seat can be supported by twin parts 11 (Fig. 15 2). The main parts 11, which very much resemble the back parts 1, touch the occiput and from there down to the neck. In the case of vehicle seats in particular, such parts 11 should be connected to each other at the upper end by means of foam or other padding bridges. The support rod 120 should then, contrary to the structure of Fig. 4 20, preferably be curved forward at its upper end, so that the head rises slightly upwards as it rests on the chair. The headrest can also be in the form of a round arch.

The back parts, as well as the parts coming to the head, can be made of foam, in which reinforcement rails made of metal or plastic are placed.

Claims (2)

A backrest for a chair, armchair, seat or the like, comprising two TVs arranged on the sides, in their form the support surfaces in horse saddles corresponding to the back parts, which are formed concave in relation to a shaft substantially perpendicular to the seat surface and convex in relative to a horizontal transverse axis above the seat surface, characterized in that the back portions are fixed approximately at their center Sr in a trailing cross-section by means of one or more rubber elements (32) so that the connecting surfaces between the rubber elements (32) and the the power-transmitting metal angles (30, 31, 33) or metallic U-pieces lie in a horizontal t or the next horizontal piano. 2. A backrest according to claim 1, characterized in that the rubber elements (32), the cross-section (20), the support-rail (4) and the back-parts (1) are enclosed with a common cover of plastic textile, foam or similar. 20