FI89001B - Seat support for office chair or the like - Google Patents

Abstract

Seat support for an office chair or the like, comprising a seat panel 2 which bears the seat cushion 3 and which, in the area around its front end, is rotatably connected to a stand body 1, holder devices 12 on the stand body for securing a column 14, a backrest 7 and an angled backrest holder 4 connected to the backrest, an approximately horizontal lower section 6 of the backrest holder being rotatably connected to the stand body, and a pneumatic spring 9 connected on the one hand to the stand body and on the other hand to the backrest holder. To obtain a simple and stable construction consisting of a small number of components, the backrest holder 4 is connected to the stand body 1 via a slide member 18 which forms a rotation bearing 23 and which can slide along a defined path section in a cam recess 17 on the stand body 1. The seat panel 2 rests with sliding on the horizontal section 6 of the backrest holder 4. The seat panel 2 advantageously consists of an essentially continuous metal plate reinforced by flanged projections and the stand body 1 consists essentially of a single injection- moulded part. <IMAGE>

Description

8 9 O Q1

OFFICE CHAIR OR SIMILAR SEAT SUPPORT

The invention relates to an office chair or a similar seat support comprising a seat cushion-supporting seat plate 5 connected to a pivoting frame in the region of its front end, fastening devices in the frame for securing a chair leg, a backrest and a backrest-mounted and provided on one side of the body and on the other side of the backrest carrier connected, with a return gas spring backrest support.

Such a seat support is known, for example, from DE-OS 26 30 820.

Essentially, such seat supports are required to allow the occupant to move as ergonomically as possible, so that the tilting position of the 20 seats in connection with a change in the user's working position must be accompanied by anatomically correct, corresponding monitoring of the backrest.

In order to solve this problem, various, in some cases very expensive, structures have been developed, which also make it necessary in part to make a number of different springs arranged at different angles, which affect a certain return.

From this point of view, it is an object of the invention to provide a seat support of the above-mentioned type in such a way that it can be realized during use with as few, low-cost individual parts as possible, in addition to guaranteeing good seating comfort and high overall stability.

According to the invention, this object is solved by connecting the backrest support to the frame via a sliding shoe forming a pivot bearing, which is slidably movable in the cam recess of the frame along a defined track part, whereby the seat plate rests slidably on the horizontal part of the backrest support.

With this structure, it is possible to combine the pure pivoting movement of the backrest, which follows the pivoting movement of the seat carrier in a coordinated manner, with the advancing movement, which makes it possible to advantageously match the movements of the seat plate and the backrest.

10

The advantage is thought of in that the cam slot is bounded by two parts of a circle, the corresponding center of the circle being below the cam slot, and thus preferably approximately at the height of the articulated shaft of the gas spring in the body. In this case, the center of the circle 15 is preferably slightly rearward relative to the articulation point of the gas spring in the body.

This geometry allows for a very compact design as well as a very compact design for the entire equipment.

20

The front and rear rear walls of the cam slot can be a response to the sliding movement in each case.

The seat plate itself is preferably formed of a very unbreakable, one-piece metal plate reinforced with flange extensions.

In the same way, the body is formed essentially from a single injection molded part. It consists of a bottom-closed base plate 30 from which longitudinal and transverse stiffening or support flanges exit. Similarly, the connection between the seat plate and the frame forms a closed device, protects the inside from dusting and gives an aesthetically pleasing image.

35 The chair cone mounting cone can be formed in one piece with the frame.

li 3 89001

In certain cases, the conical area may still be reinforced with a metal core.

It is conceivable that the longitudinal flanges of the body pass over the holder-5 cone, and thus maximum reinforcement is achieved in this area.

The structure according to the invention also makes the backrest support made of a one-piece plastic syringe-10 part.

The sliding shoe to be placed in the cam groove consists of a plastic with which a low coefficient of friction can be realized, e.g. polyamide.

In the following, the invention will be described in more detail by means of a preferred embodiment in conjunction with the drawings. They present

Fig. 1 is a section through a seat support according to the invention, in which the second seat position is shown in broken lines,

Fig. 2 is a bottom view of the seat support according to the invention, Fig. 3 is a top view of the frame and

Fig. 4 is a section through the body in the area of the cam.

The seat support shown in the drawing comprises a body 1 injected in one piece from plastic 30, a seat plate 2 consisting of a one-piece metal plate on which only a seat cushion 3 shown is placed, an angular backrest support 4 with a substantially vertical part 5 and a substantially horizontal part a backrest 7 attached to the vertical part 5.

4 39001

A pair of gas springs 9 extending obliquely backwards and upwards are pivotally mounted on the frame 1 about a shaft 8, which are pivotally connected to the horizontal part 6 of the backrest support 4 via a pivot shaft 10 (cf. Fig. 1).

The frame 1 is further formed by a fastening cone 12 provided with an inner metal reinforcement 11 for a corresponding part 13 of a chair leg 14 with a leg grid (not shown here).

From the front end of the seat plate 2, four connecting plates 15 extend downwards, each of which is pivotally connected to the frame 1 via two pivot bearings 16.

15

The body 1 has a cam recess 17 (cf. Figs. 1 and 4) formed in one piece with it by injection, in which a sliding shoe 18 with corresponding outer contours slidably filling this only partially, for example in half, is arranged (cf. Fig. 1). The cam groove 17 consists of two delimiting walls 19, 20 formed in the shape of a part of a circle and running concentrically with respect to each other, the associated circle center M being slightly behind and below the pivot axis 8 of the gas spring 9. 25

The front and rear end walls 21 or 22 of the cam slot 17 act as a response to the slipper 18 shown in FIG. l in two different extreme positions.

A sliding bearing is formed on the sliding shoe 18 by means of a pivot bearing bolt 23, in which the front end of the horizontal part 6 of the backrest support 4 is pivotally attached to the pivot bearing bolt 23. Correspondingly, the backrest support 4 is pivotable about the axis of the pivot bearing bolt 23 and at the same time the circular path is displaced in the pivoting movement of the seat-35 plate 2. By means of portability, it is meant that the seat plate I: 5 89001 2 has an extension 24, in which the underside of this extension 24 is slidably on the horizontal part 6 of the backrest support 4. From the above, in connection with Fig. 1, it becomes clear that when a person sitting on a seat support transfers his weight in Figs. 5 1 in cross-section from the rearwardly tilted position shown forward, the seat plate 2 pivots about the pivot bearing 16, the weight of the person no longer strains the gas spring 9.

Correspondingly, the gas spring 9 can push the rear end 10 of the seat plate 2 upwards as it grips the horizontal part 6 of the backrest support 4 and presses it up forwards. This clean pivoting movement is connected to the sliding movement of the front end of the horizontal part 6 of the backrest bracket 4 by means of a sliding shoe 18 in the cam slot 17 which, together with the seat plate slider 15, ensures that the inclined gas spring

As fig. 3 and 4, the body 1 consists of a one-to-20 plastic syringe part with a closed bottom bath 25 from which a plurality of transverse flanges 26 and longitudinal flanges 27 exit, the longitudinal flanges extending V-shaped into the cone 12 of the chair leg 14 and reinforcing this accordingly. area in particular.

25

Fig. 2 shows that the seat plate 2 consists essentially of a one-piece sheet metal part with a number of printed reinforcing flanges 28. In addition, Figs. 2 it can be seen how the horizontal part 6 of the backrest support 4 engages 30 by means of the bolt 23 in FIG. 2 and is thus movable around the road S.

The armrests 30 are also fastened to the seat plate 2 by means of screws 29 as shown (marked in cut off in Fig. 2). 35

Claims (11)

A seat holder for an office chair or the like, comprising a seat cushion (3) supporting a seat plate (2), which in the area 5 around its front end is pivotally connected to a stand body (1), holder means (12) on the stand body for fastening. inserting a pillar (14), a backrest (7) and an angled backrest bracket (4) connected to the backrest, a roughly horizontal thread, lower section (6) of the back-J support holder rotatably connected to the stand body and one to the stand body 4 on one side and the backrest bracket 4 on the other side connected, the backrest bracket 4 resetting gas spring (9), characterized in that the backrest bracket (4) is connected to the stand body (1) via a sliding shoe (18) forming a sliding shoe (18) which is slidably slidable longitudinally a definite web section in a chamber roof (17) p4 the frame body (1), the seat plate (2) sliding resting on the horizontal section (6) of the backrest bracket (4). 2. Seat holder according to claim 1, characterized in that the camshaft (17) is limited by two circular segments (19, 20), the associated circular center point (M) being below the camshaft (17). Seat holder according to claim 2, characterized in that the circle center point one (M) is approximately p4 on the frame body (1) about the height of the shaft (8) of the gas spring (9). Seat holder according to claim 3, characterized in that the circle center point (M) is slightly offset rearwardly against the shaft (8) of the gas spring (9) p4 the frame body (1). Seat holder according to claim 1, characterized in that the rear and front wall (21 and 22) of the camshaft (17) serve as a stop for the sliding movement. i 9 89001 Seat holder according to claim 1, characterized in that the seat plate (2) is formed as a substantially unbroken metal plate in one piece, reinforced by flange protrusions. Seat holder according to claim 1, characterized in that the support body (1) consists essentially of a single injection molding part. Seat holder according to claim 7, characterized in that a one-piece mounting cone (12) for a pillar (14) is formed integrally with the frame body (1). Seat holder according to claim 7, characterized in that the stand body (1) has a plurality of vertical flanges (27) extending from the area around the front edge of the seat in the direction of the mounting area of the pillar (14). Seat holder according to claim 1, characterized in that the back support holder (4) is formed as a one-piece plastic injection. 20 Seat holder according to claim 1, characterized in that the sliding shoe (18) consists of polyamide and polyaryamide respectively.