EP0198056B1 - Seat support for chairs, especially for rotating work-chairs - Google Patents

Abstract

A seat support for rotating work-chairs comprising the following operating parts: a base element (3) with a support (6) attached at one end, a seat plate fixture (2) and back rest support (4); the seat support has a connecting-piece (7) attached to the operating parts, which is fixed to the back rest support (4) and can be moved on the base element (3) by means of a slide-type guide (10, 11). To lock the movement of the operating parts, a setting means (13) is attached to the connecting-piece (7), which is designed as a lamella package.

Description

The invention relates to a seat support for chairs, in particular work swivel chairs, which is preferably T-shaped and is supported by a support on a base of the chair, the connection of the support to the seat support being non-positively designed, and the seat support equipped with actuating means triggering its functions is how this seat support is formed by at least two functional parts.

It is known to equip seating furniture of recent times with a series of metallic parts, of which essentially the seat support, a column supporting it against a base frame and the base frame itself should be mentioned. The seat support, which can have a more or less complex mechanism for various functions, depending on the design of the seating furniture, is often T-shaped and is made up of some functional parts, the main ones of which are a so-called base body and a backrest holder. In order to be able to adjust the inclination of the backrest against the seat surface, the backrest holder is connected to the base body in an articulated manner, and the base body itself is connected to the seat surface by connecting means. The support, which is preferably non-positively connected to the base body, has a cone on its end facing the base body, which engages non-positively in a conical bush and thereby ensures a firm connection between the support and seat support. In order to trigger the function of the support, which can often be a gas spring, actuating means are guided through the seat support, one actuating means of which is the release lever for the release mechanism of the gas spring. In order to bring about the inclination of the backrest holder relative to the seat support, the latter is both articulated to the base body and provided with locking means that hold the respective inclination adjustment of the backrest and / or seat surface. From DE-U-8326792 a seat support for chairs, in particular work swivel chairs, is known, consisting of a base body with end-mounted support for the positive connection with a central support leg of the seat support, a seat plate attachment and a backrest support, and adjusting means for triggering predetermined functions of the Seat support and its parts, wherein the backrest support is U-shaped and is guided with its lower end region to approximately centrally below the seat plate and has a cross bolt which connects the seat plate fastening, which is also U-shaped, at its rear end to the backrest support in an articulated manner , while the front end of the seat plate attachment is articulated to the U-shaped base body by a further cross bolt, the base body running at an acute angle to the seat plate attachment and the base body having a lower que rbolzen, which is movable in a link guide at least one connecting member, which is connected to the backrest support and wherein a clamping means arranged coaxially to the lower transverse bolt of the base body is provided for the non-positive connection of the connecting member to the base body.

In these known seat carriers, however, it is considered disadvantageous that when the back and / or seat inclination is adjusted, they move very differently from one another, as a result of which a seated person moves the item of clothing, for example, (shirt-pulling effect) or the seated person has an uncomfortable feeling is awarded. The suggestion of making the inclination of the seat adjustable is also perceived as uncomfortable and prevents the setting of an ergonomic seat position.

The invention is therefore based on the object of developing a seat support of a known design such that these effects no longer occur on the one hand and the seat support itself forms a closed, low-maintenance unit and an overall slight movement of the functional parts relative to one another when adjusted over a large adjustment range allows.

According to the present invention, this object is achieved in a seat support of the type mentioned in that the backrest support has a further cross bolt which is arranged below and set back to the first cross bolt and that a spring is attached between the base body and the seat plate fastening, the spring force Push the main body and the seat plate mounting apart.

Advantageous embodiments of the invention are included in the subclaims.

Through these measures, a seat support is created which advantageously solves the task as well as being simple to construct and manufacture, and which also has a high level of stability. The subdivision of the seat support into individual functional parts also enables an optimization of the function of the inclination adjustment, as a result of which it is accepted by users on the one hand due to its simple handling and the satisfying feeling on the other hand.

A particularly advantageous solution to the problem is created in that the U-shaped backrest support for a seat support for work swivel chairs, which essentially consists of a base body with end-mounted support, a seat plate attachment and a backrest support and adjusting means for triggering predetermined functions of the seat support is guided with its lower end area to approximately centrally below the seat plate and has an upper cross pin and set back a lower cross pin, of which the upper cross pin the U- shaped seat plate attachment at its rear end in an articulated manner, while its front end is connected in an articulated manner to the U-shaped base body by a further cross bolt which, at an acute angle to the seat plate attachment, has the end of the support for the non-positive connection to the support leg of the seat support and carries a cross bolt, which is movable in an arcuate link guide of essentially triangular slats, which are both connected to the upper cross bolt and by means of a clamping means arranged coaxially to the cross bolt for the positive connection of the slats to the base body against the force of one each between the base body and the seat plate attachment effective leg spring can be determined.

In a special embodiment of the invention it is provided that the U-shaped backrest support is articulated to the seat plate fastening with its upper end region and articulated to the U-shaped base body with its lower end region of the vertical webs and, like the seat plate fastening, has a cross bolt on which slats are articulated with link guides that can be moved around a common cross bolt in the base body.

In a further embodiment of this invention, the lamellae can be strip-shaped, alternately layered and can be slid over one another with their link guides around the transverse bolt in relative movement.

Furthermore, the cross bolt can simultaneously receive the clamping means for the positive connection of the lamellae to one another and to the base body against the force of a helical spring inserted between the base body and the seat plate attachment. In improving this inventive concept, the cross bolt can be expediently designed as a sleeve, through which a rod is guided, which receives a threaded nut at one end and a clamping sleeve between the threaded nut and the external lamella, while the opposite end is bent through 180 ° and to Rotation of the rod is inserted into a hole in the base body and in turn carries an adapter sleeve between the outer lamella and the 180 ° bend. Here, a molded part can be placed around the cross bolt, which is used to lock a lever serving for height adjustment.

The strip-shaped lamellae according to the invention are simple to manufacture, require very little space on the assembled seat support and are light in weight. The link guides within these strip-shaped slats intersect around the common third cross bolt and allow a relatively large degree of movement due to the long cut guide links. Furthermore, differentiated movements of functional parts are possible with this type of lamella as a connecting link between the functional parts. The movements of the functional parts take place when the clamping device is released solely by the coil springs used. It is a further advantage that the third cross bolt simultaneously receives the clamping means in the form of a continuous rod which is mounted in sleeves.

• Fig. 1 Eine Seitenansicht auf einen Sitzträger mit den ihn bildenden Funktionsteilen und das Verbindungsglied für die Neigungsverstellung,
• Fig. 2 den Sitzträger nach Fig. 1 mit anderem Verbindungsglied in der Seitenansicht,
• Fig. 3 eine Ansicht auf den Sitzträger gemäß der Linie 111-111 in Fig. 1 und
• Fig. 4 eine Seitenansicht auf den Sitzträger gemäß Fig. 1, jedoch mit einem etwas abgewandelten Verstellglied,
• Fig. 5 den erfindungsgemäßen Sitzträger in der Seitenansicht und
• Fig. 6 den Sitzträger in der Ansicht des Pfeiles VI nach Fig. 5.

Examples of the invention are shown in the drawing. Show it:

• 1 is a side view of a seat support with the functional parts forming it and the connecting link for the inclination adjustment,
• 2 shows the seat support according to FIG. 1 with a different connecting link in a side view,
• Fig. 3 is a view of the seat support along the line 111-111 in Fig. 1 and
• 4 shows a side view of the seat support according to FIG. 1, but with a somewhat modified adjusting member,
• Fig. 5 shows the seat support according to the invention in side view and
• 6 shows the seat support in the view of arrow VI according to FIG. 5.

The seat support 1 according to the invention is essentially formed by three functional parts, one of which forms the base body 3, another the seat plate fastening 2 and yet another functional part the backrest support 4. Because of their strength, all functional parts are preferably made of U-shaped profiles and connected to one another via articulated connections. The base body 3, which represents the base part of the seat support 1, is provided at its freely projecting end with a conical support 6, in which a cone of a support leg 15 of the seating furniture engages in a force-locking manner. The other end of this base body 3 is articulated to the seat plate attachment 2 by means of the cross bolt 5, and this in turn is articulated to the backrest support 4. Due to this articulated connection of the functional parts 2-4, the seat support 1 can be adjusted at an inclination so that hardly any shear effect occurs between the parts and thus the backrest also experiences no shear effect against the seat surface. To ensure this effect, the individual functional parts 2-4 are connected to one another via a connecting member 7, in such a way that the kinematics is possible, and the connecting member 7 is fixed to at least one functional part 2, 4 and is movably guided on a further functional part 3 .

The connecting member 7, which can be designed as a triangular plate pack, is fixed with its two end points on the one hand to the backrest support 4 and on the other to the seat plate attachment 2 via bolts 8. The third end point of this plate pack is provided with a link guide 10 and movably guided on a bolt 11 on the base body 3. Through this articulation of the functional parts 2-4, a movement of the backrest support 4 can take place about its articulation 8 on the seat plate attachment 2, so that when the backrest is inclined Seat plate attachment resting seat 14 of the backrest support 4 goes synchronously. Analogous to the use of the plate pack, another connecting link 7 could also be provided here.

Such a link 7 would be, for example, a cantilever arm according to FIG. 2, which represents the extension of the backrest support 4. This cantilever 12 has the articulation 8 to the seat plate attachment 4 and carries in its extension, i.e. at its free end, the link guide 10, which surrounds the cross bolt 11 of the base body 3. In such a case, the third articulation point on the backrest support 4 is omitted or an interposed plate pack is used.

The connecting member 7, which can be designed as a plate pack, cantilever arm 12 or other connecting part, can be arranged on only one side of the seat support 1 or symmetrically to its longitudinal central axis X. The symmetrical arrangement is advantageous in that it ensures better guidance of the functional parts 2-4 to one another. In order to bring the functional parts 2-4 into a starting position, a leg spring 17 can be provided between the base body 3 and the seat plate fastening 2. Another leg spring 16 is located between the backrest support 4 and the seat plate attachment 2 for the same reasons.

The frictional engagement of the plate pack 7 takes place in such a way that a screw connection 13 is provided on the seat support 1, which presses the plate together, preferably in the area of the link guide 10.

Instead of the screw connection 13, a spring can also effect the frictional connection, this constantly exerting its force on the lamellae 7 and only canceling this force to loosen the same.

Loosening the screw connection or the tensioning means 13 causes the functional parts 2, 3, 4 to make an inclination adjustment automatically because of the leg springs 16, 17 which are inserted between them. The position desired by the operator is locked by the clamping means 13.

According to the representations in FIGS. 5 and 6, the seat support 18 essentially consists of a horizontally arranged seat plate attachment 19, a base body 20 articulated thereto by a cross pin 22 and a backrest support 21 which is connected to the seat plate attachment 19 by an upper cross pin 24 and by one lower cross bolt 25 is pivotally connected to the base body 20.

The backrest support 21 has elongated vertical webs 34 at its lower end region.

The base body 20 extends from the seat plate attachment 19 at an acute angle downwards in the direction of the backrest support 21. The base body 20 has the support 23 at its lower end. The backrest support 21 has in its rearward extension the actual support 33 for the attachment of a backrest, not shown. Backrest support 21 and support 33 can be screwed together in the simplest form.

Strip-shaped slats 29 with a link guide 31 are suspended from a cross bolt 26 on the seat plate attachment. Further strip-shaped lamellae 28 with a link guide 30 are fastened around a cross bolt 27 on the backrest support 21. The slats 29 and 28 surround with their link guides 30 and 31 the common bolt 25 and are alternately layered one above the other. The common transverse bolt 25 is in principle formed by a rod 36, which belongs to the clamping means 35 and serves to loosen and also to connect the stacked lamellas. For this purpose, the rod 36 has a thread on its outer end, which carries a threaded nut 37. A clamping sleeve 38 is inserted between the outer lamella 28 and the threaded nut 37. Another clamping sleeve 40 is located on the opposite side between the in turn outer lamella 28 and the 180 ° bend of the rod 36. The end piece of the rod 36 engages after the 180 ° bend to prevent the clamping means 35 from rotating in a corresponding bore 39 in the base body 20 a. Between the seat plate fastening 19 and the base body 20 there are two helical compression springs 32 which are arranged next to one another and which are expediently held in the inserted position by means of screw bolts.

A loosening of the threaded nut 37 on the clamping means 35 has the effect that on both sides of the seat support 18 the lamellae 28 and 29 which are stacked around the bolt 25 are loosened at their positive connection. As a result, movement of the base body 20 in the direction against the force of the helical compression spring 32 or the seat plate fastening 19 in the direction of the base body 20 is possible. On the other hand, however, lowering the backrest support 21 together with the support 33 from the position shown in FIG. 5 downwards is possible. As a result, the backrest assumes a position and holder desired by the person. This pivoting of the backrest support 21 takes place together with the horizontal seat plate attachment 19 around the cross bolt 22, the two packs of strip-shaped lamellae being different due to their. Move the link guides around the bolt 25 one above the other. When the backrest is completely lowered, the slats 28 and 29 form approximately a cross when the pin 25 is in the final position in the link guides.

The lever 41, which is also provided in the base body through corresponding bores 42, serves to adjust the height of the seat support 18 with a corresponding effect on the support leg.

Claims (10)

1. A seat bracket for chairs, in particular swivel work chairs, consisting of a base body (3; 20) having a support (6; 23) fastened at the end side for the force-locking connection to a central supporting leg (15) of the seat bracket a seat-plate fastening (2; 19) and a back-rest bracket (4; 21), as well as adjusting means for releasing predetermined functions of the seat bracket and its parts, in which respect the back-rest bracket (4; 21) is U-shaped and is conducted with its lower end region as far as approximately centrally underneath the seat-plate and has a transverse pin (8; 26) which hingedly connects the seat-plate fastening (2; 19), which is likewise U-shaped, at its rear end to the back-rest bracket (4; 21), whilst the front end of the seat-plate fastening (3; 14) is connected hingedly to the U-shaped base body (3; 20) by a further transverse pin (5; 22), in which respect the base body (3; 20) extends downwards at an acute angle to the seat-plate fastening (2; 19) and in which respect the base body (3; 20) carries a lower transverse pin (11; 25) which is movable in a slotted guide (10; 30, 31) of at least one connection member (7; 28, 29) which is connected to the back-rest bracket (4; 21) and in which respect a thrust means arranged coaxially to the lower transverse pin (11; 24) of the base body (3; 20) is provided for the force-locking connection of the connection member (7; 28, 29) to the base body (3; 20), characterised in that the back-rest bracket (4) has a further transverse pin (9,27) which is arranged underneath and set-back with regard to the first transverse pin (8, 26) and in that a spring (17, 32) is situated between the base body (3, 20) and the seat-plate fastening, in which respect the spring force forces the base body (3, 20) and the seat-plate fastening apart.

2. A seat bracket for chairs according to claim 1, characterised in that the connection member (12) is designed in one piece with the back-rest bracket (4,18).

3. A seat bracket for chairs according to claim 1, characterised in that the connection member (7) is designed as at least one lamella set and in which respect the lamellae are connected to the first transverse pin (8) of the back-rest bracket (4), to the second transverse pin (9) of the back-rest bracket (4) and have the slotted guide (10) for the reception of the lower transverse pin (11) of the base body (3).

4. A seat bracket for chairs according to one of claims 1 to 3, characterised in that the thrust means between the seat-plate fastening (2) and the back-rest bracket (4) is a further spring (16) which forces the seat-plate fastening (2) and the back-rest bracket (4) apart.

5. A seat bracket for chairs according to claims 1 to 4, characterised in that the springs (16, 17) are leg springs.

6. A seat bracket according to claim 1, characterised in that the U-shaped back-rest bracket (21) is fastened by its upper end region hingedly to the seat-plate fastening (19) and is fastened by its lower end region hingedly to the U-shaped base body (20) and in the same way as the seat-plate fastening (19) has a transverse pin (26, 27) to which lamellae (28,20) are hinged with the slotted guides (30, 31) which are displaceable about a common third transverse pin (25) in the base body (20).

7. A seat bracket according to claim 6, characterised in that the lamellae (28, 29) are strip- shaped in design, are alternately stacked and can be pushed over one another in relative movement with their slotted guide (30, 31) about the transverse pin (25).

8. A seat bracket according to claims 6 and 7, characterised in that the transverse pin (25) simultaneously receives the thrust means (35) for the force-locking connection of the lamellae (28, 29) to one another and to the base body against the force of a spiral spring (32) inserted between the base body (20) and the seat-plate fastening (19).

9. A seat bracket according to claims 6 to 8, characterised in that the transverse pin (25) is designed as a sleeve through which a rod (36) is conducted, which at its one end receives a threaded nut (37) and between the threaded nut (36) and the outwardly-lying lamella (28) receives a clamping sleeve (38), whilst the opposite end is bent over through 180° and for the protection against torsion of the rod (36) is introduced into a bore (39) on the base body (20) and in turn carries a clamping sleeve (40) between the external lamellae (28) and the 180°-arc.

10. A seat bracket according to the aforementioned claims 6 to 9, characterised in that a shaped part which serves for locking a lever (41) serving for the height adjustment is placed about the transverse pin (25).

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