DE2804703A1 - BACKREST WITH HEIGHT AND ARM ADJUSTMENT - Google Patents

Description

The invention relates to a backrest with a height and curvature adjustment device, in particular for vehicle seats.

With such backrests an adjustment of the size of the arching and the relative height of the arching to a seated one Person.

There are known curvature adjustment devices for backrests in which steel cables are passed through pipe sections, which have different bevels on one or both sides, so that depending on the tension of the inner steel cable and a different curvature is achieved for the respective bevels of the pipe sections. The height of the bulge is adjustable by means of a screw spindle that adjusts the entire backrest element. In particular the curvature adjustment device Such a backrest is complex and uneconomical to manufacture and assemble.

IX / 8

Dresdner Bank (Munich) Account 3939 844

Postal check (Munich) account 670-43-804

909832/0198

Ü4703

It is the object of the invention to provide a backrest that is inexpensive to manufacture and easy to assemble with height and to provide a camber adjustment device.

This object is achieved according to the invention by an elastic plate in the form of a backrest, which is attached to at least two opposite edges is clamped between tabs, the mutual spacing of which is adjustable and which are height adjustable together with the plate.

The distance between the two brackets is advantageously adjusted using guide rails attached to the brackets, which are in sliding engagement with one another and mutually lockable by means of the curvature adjustment device.

For a curvature of the plate about a horizontal axis can

an upper and lower flap is arranged on the upper and lower edge of the plate and a single tab is located on each of these in the middle Be attached in a T-shape. These guide rails are then positively guided in the longitudinal direction and with the curvature adjustment device adjustable and lockable relative to each other.

Furthermore, a base plate to be fastened to the seat, in which the guide rail is located, can be present on the back of the backrest the lower flap is guided vertically and is adjustable with the height adjustment device. That way is the entire backrest including the upper and lower bracket with their guide rails and the plate as one unit Can be adjusted in height without affecting the curvature of the plate once it has been set.

The local position of the curvature of the plate is appropriate controllable by means of depressions, indentations, cutouts and the like in the plate.

9 0 9 8 3 2/0198

^0RIQIWAL ^ fecte

-5- B 8684

Further developments of the invention are set out in the subclaims. ■■

The invention is explained in more detail below with reference to the drawing using an exemplary embodiment.

Fig. 1 shows a view of a backrest

with height and curvature adjustment device from behind;
10

Figure 2 shows a side view of the backrest of Figure 1;

Fig. 3 shows the section along the line III-III of Fig. 2.

A backrest shown in Fig. 1 has a plate made of a stainless material of high elasticity, for example Plastic. The outer edge of the plate 1 has a desired backrest shape. At the top and bottom of the plate 1 is an upper and lower tab 2 and 3 respectively, each of which encompasses the edge of the plate and the plate between clamp yourself. In the center of the tabs 2 and 3, guide rails 4 and 5 are attached so that they fit with the tabs form τ. The guide rail 5 assigned to the lower flap 3 has two U-shaped folds on the longitudinal edges in which the guide rail 4 of the upper bracket 2, which is bent up in the middle in the longitudinal direction, is guided in a longitudinally displaceable manner.

The lower tab 3 together with the guide rail 5 attached to it is guided in a vertical direction displaceably in a base plate 6 which is attached to a seat (not shown). For this purpose, an elongated hole 7 in the center of the base plate 6, in which a corresponding bolt 8 fastened to the guide rail 5 slides, and guide edges 9 are formed along which the U-shaped beveled longitudinal edges of the rail 5 can be displaced. good sincL Om ü®n BoIs® ^

90 9 832/0198

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8, a saber-shaped end of a grips on the base plate 6 mounted rocker arm ^. 10, which is parallel to the base plate 6 and runs essentially to the plate 1 and at its other end a handle, not shown, for height adjustment Has. By actuating the lever 10, the actual backrest with the plate 1, the bracket 2 with the guide rail 4 and the bracket 3 with guide rail 5 adjusted in height without the two brackets experiencing a change in distance.

The curvature adjustment device of the backrest is designed in the form of an Eowden cable. The jacket 11 of the Bowden cable is with slack or play with one end in the vertical direction on the upper portion of the guide rail 5 and with the other end is attached to the base plate 6 in the horizontal direction. The wire core 12 of the Bowden cable is with her upper end attached to the tab 2 at the upper end of the guide rail 4 and at its other end to a threaded pin 13, which engages with a threaded hole of a rotatable and axially fixed rotary handle 14 on the base plate 6 stands. The threaded pin 13 is prevented from rotating with a crosspiece 16 supported on the base plate 6, so that through Turning the rotary handle 14 moves the threaded pin 13 out of the handle or into the handle and thus moves the upper section the wire core 12 is lengthened or shortened relative to the upper end of the jacket 11. Since plate 1 is also used with in tabs 2 and 3 that are at the greatest distance are still slightly arched, the two tabs are constantly pushed apart and thus the wire core 12 is constantly under tension. By shortening the wire core against this tensile force, the Warpage of the plate 1 can be increased; by lengthening the wire core, the plate can relax and take you A state of less warping by pressing tabs 2 and 3 a greater distance apart. An independent one Adjustment can be made by suitable means, such as a self-locking thread between the threaded pin and the rotary handle, be prevented.

909832/0198

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The local distribution of the curvature on the plate is controlled by depressions 15 formed in the plate.

The backrest shown in Figure 2 with solid lines is shown in its minimally curved state, while the dash-dotted backrest is in its maximally curved state.

The sag of the Bowden cable must be dimensioned so that the backrest can be adjusted to its highest position, without the jacket of the Bowden cable attached to the lower guide rail 5 and the base plate 6 forming an obstacle,

Fig. 1 shows the uppermost height position of the backrest and, when drawn out, its lowest position.

A catch, as indicated at 17, is used to adjust the lever 10.

'909832/0193

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Claims (1)

_. ._ mf f *. Patent attorneys: TlEDTKE - DÜHLING "IXINNE - TJRUPG DIpl.-lng. H. Tiedtke Dipl.-Ghem. G. Bühling Dipl .-! Ng. R. Kinne η / 7 η Q ^DipL " ^lng - ^ρ · ^Grupe .U if / UJ Bavariaring 4, Postfach 20 24 8000 Munich 2 Tel .: (0 89) 53 96 53 Telex: 5-24845 tipat cable: Germaniapatent Munich February 3, 1978 B 8684 Claims 1. Backrest with height and curvature adjustment device, in particular for vehicle seats, characterized by an elastic plate (1) in the form of a backrest which is attached to at least two opposite edges is clamped between tabs, the mutual spacing of which is adjustable and which are common are height adjustable with the plate (1). 2. Backrest according to claim 1, characterized in that guide rails (4,5) are attached to the tabs (2,3), which are in sliding engagement with one another and mutually lockable by means of the curvature adjustment device. 3. Backrest according to claim 1 joder 2, characterized in that an upper and lower edge of the plate (1) or lower tab (2, 3) engages around and each centered on a single upper or lower guide rail T-shaped is attached. 4. Backrest according to claim 3, characterized in that a base plate to be attached to the seat on the back of the backrest (6) is provided in which the guide rail (5) of the lower bracket (3) is guided vertically and with de: "Height adjustment device is adjustable. 5. Backrest according to claim 4, characterized in that the base plate (6) has a vertical elongated hole (7) and Has guide edges (9) in which the guide rail (5) Dresdner Bank (Munich) Account 3939 844 Postscheck (Munich) Account 670-43-804 ^Ιχ / ⁸ 909832/0198 ..,; ■ ..- is guided by means of a bolt (8) attached to the rail, around which a fork-shaped end of one on the base plate mounted rocker arm (10) engages, which has a handle at the other end. 6. Backrest according to claim 4, characterized in that the height adjustment device is a threaded spindle. 7. Backrest according to at least one of claims 3 to 6, characterized in that the curvature adjusting device is a Bowden cable, the jacket (11) with slack with one end in the vertical direction at the upper section the lower guide rail (5) and the other end to the base plate (6), and its wire core (12) one end to the guide rail (4) of the upper bracket (2) and the other end to a threaded pin (13) which engages with a threaded bore of a rotatable and axially fixed rotary handle (14) on the base plate and is prevented from rotating by a crosspiece (15) supported on the base plate. 8. Backrest according to claim 7, characterized in that the rotary handle (14) laterally of the plate (1) with horizontal Axis is arranged. 9. Backrest according to at least one of claims 3 to 8, characterized in that the guide rail (5) the lower flap (3) has a profile with two U-shaped folds on the longitudinal edges, in which the center is bent up in the longitudinal direction Profile of the guide rail (4) of the upper bracket (2) is guided with their edge strips. 10. Backrest according to at least one of the preceding Claims, characterized in that the plate depressions (15), indentations, slots, or the like. having the local Control the warping of the plate (1). 9 0 9 8 3 2/0198 CRiGiNAL I? MSPECTED