Chair, particularly office-chair

The invention relates on a chair, in particular office chair, having a a backrest support on a seat support hinged backrest and with a synchronism therewith moveable seat surface, the front portion via a sliding guide and its rear portion via a seat link to the seat support connected is.

Seating and in particular chairs, in which their seat and their Moving back synchronously, are with various synchronizing mechanisms in Use. The synchronous mechanism is used for adjustment of the backrest at the same time to change the position of the seat.

Thus, DE 42 19 599 A1, a chair or armchair with synchronously adjustable Inclination of the backrest and seat known. This chair is by means of a on the seat in the rear region on the one hand and the seat support on the other hand articulated seat handlebar with increasing inclination of the backrest, the seat raised, at the same time a one hand, with the seat and on the other hand with the backrest link rotatably connected finger lever the seat pulls back. Due to this lifting of the seat in the rear, the backrest region facing the user can recline the backrest slip on the seat forward. In a synchronous movement However, of the backrest and seat, the seat should be at least as backward and downward tilt to the user upon recline received or collected on the seat or the seat exerted thrust becomes.

The invention is therefore based on the object, a chair, in particular a Office chair, with particularly suitable and easily realizable synchronous mechanism specify.

This object is achieved by the features of claim 1. On the one hand the distance of the seat link connected with the seat surface the upper pivot point of the backrest is smaller than the distance of the Seat link with the connecting seat support lower pivot point to the backrest. Thereby with increasing inclination of the backrest is no increase, but advantageously lowering the seat. On the other hand, to Synchronization between the movement of the backrest and the movement of the Seat a sliding guide of the seat provided in the backrest link.

The invention is based on the consideration that when a chair or Seating with adjustable seat and adjustable backrest, the adjustment of the seat and backrest one hand on the other hand initially can be considered independently. The construction thus has first two on degrees of freedom. The adjustment of the backrest has In this case, only a single degree of freedom when the articulation of the backrest rigidly to the seat support in a simple manner via the backrest associated backrest support is realized, of the seat support only a Axis of rotation is rotatably mounted. In addition, the seat can complex having adjustment, which analogously to the adjustability of the backrest nevertheless can be assumed that also the adjustment the seat with a single degree of freedom can be described. The movement the seat can in this case both a translational and tilting movement or a combination of various forms of movement.

A coupling of the movements of the seat surface on the one hand and the backrest on the other hand should it ensure, first, that any possible position the backrest is associated with a position of the seat surface, whereby the entire Construction is limited to a degree of freedom. These requirements and a both durable stable and structurally simple executed Kopelmechanismus be a sliding guide of the seat in the backrest link fulfilled. This is overall a very simple synchronous mechanism given.

For this purpose, the seat surface via a connection with this rigid axle in a be done provided the backrest link slot. is advantageously However, the seat surface and the seat link common upper pivot point in a corresponding slot made in the backrest link. The seat link is made concave arched expediently towards the seat.

As envisaged in the front seating area sliding guide may be formed by the seat support provided slot and guided therein, rigidly connected to the seat surface associated axis or be realized by a cylinder. is matter advantageously an obliquely toward the seat support extending down Sliding guide provided. Due to the inclined arrangement of the length compensation element effective front sliding guide of the seat surface not only an undesirable lifting of the front edge of the seat during the return own the backrest is avoided, but rather a decrease of the Front edge of the seat back reaches the own of the backrest. These Reduction is more pronounced, the more the slope of the sliding guide deviates from the horizontal and extends in the direction to the vertical.

By the connected to the upper seat surface of the seat pivot arm outgoing inclination of the seat arm forward and down is in ergonomic Terms of comfort increased in that the seat surface when restoring self the backrest lowers mainly in its rear portion, while at the same time the front edge of the seat back and moved down. Thus, the seat is replaced in the desired manner in which front rear region a greater range of motion than in their Area.

Exemplary embodiments of the invention based on a drawing explained in more detail. Therein:<dl tsize="6" compact="compact"><dt>Fig. 1</dt><dd>in a schematic side view of an office chair in rest position,</dd><dt>FIG. 2</dt><dd>the office chair according to FIG. 1 in reclined rearward end position.</dd></dl>

Corresponding parts are in both figures with the same reference numerals provided.

Trained as an office chair 1 according to FIG. 1 comprises a solid with a dashed pedestal shown 2 associated seat support 3. With the seat carrier 3 is rotatably connected via a backrest support 4 a backrest. 5 The Backrest 5 is in the rest position shown in FIG. 1 out in that shown in Fig. 2 reclined position or position to the rear tiltable. The inclination of the backrest 5 is effected by a rotation around a Fulcrum D1. For this purpose, the backrest support integral with the backrest 5 4 connected to the seat support 3 about an axis of rotation A, with the fulcrum D1 is essentially given by the central axis of the rotation axis A.

The seat support 3, a seat 6 is furthermore articulated via a seat link 7, the arched in the exemplary embodiment in the direction towards the seat face 6 convex or is carried bent. The seat link 7 is connected to the seat carrier via a swivel joint 3 And D2 with the seating surface 6 in the rear region, ie in which the backrest 5 facing the rear half 6b seat via a swivel joint rotatable D3 connected. The pivot points D2 and D3 are in turn by appropriate Rotational axes realized via which the seat link 7 to the seat carrier 3 on the one hand and is pivotally connected with the seat 6 on the other.

In the front area, ie in the back facing away 5 front seat half 6a is the seat 6 is connected via a sliding guide 8 with the seat carrier third The sliding guide 8 may in a manner not shown as an elongated hole connected in the seat support 3 and guided therein, with the seating surface 6 of rigid designed as guided in the seat support 3 - cylinder axis 9 or - as shown be. This is then rotatably connected to the seating surface 6 about the axis of the ninth The sliding guide 8 is inclined towards the stand. 2 Of the Inclination angle α is between the sliding guide 8 and the vertical V while α = (45 ± 30) °, <i>α</i> is preferably 45 °.

For synchronization of the movement of the backrest 5 and the movement of the Seat 6 is in a recess provided in the backrest support 4 sliding guide these 10 out. Here, a long hole is expediently 11 provided in the backrest support 4, in which the pivot point D3 between the seat 6 and the seat link 7 visual axis is out 12th Alternatively, in this area at the Seat surface 6 is a separate axis 12 may be provided which then not with the Fulcrum D3 coincides.

If the backrest 5 represented by inclination backwards in the in Fig. 2 accommodated position, so is this tendency of the backrest support 4 clockwise rotated, and thus the seat link 7 along with the seat face 6 to bottom emotional. Here, the angle β between the seat link 7 and the vertical V of approximately 45 ° to 60 ° to about 90 °. In the final position of the seat link is 7 thus nearly horizontal.

Due to the inclination of the backrest 5 descends together with the fulcrum D3 the seating surface 6 in its rear region 6b from. At the same time moved the leading edge 13 of the seat 6 backwards and downwards, wherein the requisite length compensation is carried out through the front sliding guide. 8 The consequent displacement of the leading edge 13 of the seat 6 for in Fig. 1 point 13 'shown is illustrated by the length of arrow 14. These Lowering of the front of the seat 13 is less than the lowering of the rear Portion 6b of the seat 6, so that this total lowered and clockwise is tilted.

In reclined back position is of the seat link 7 with the seat surface 6 connecting upper pivot point D3 relative to the seat surface 6 deeper than the the backrest support 4 linking to the seat carrier 3 pivot point D1 while this is in the rest position below the pivot point D3.

LIST OF REFERENCE NUMBERS

<dl tsize="2" compact="compact"><dt>1</dt><dd>chair</dd><dt>2</dt><dd>stand</dd><dt>3</dt><dd>seat support</dd><dt>4</dt><dd>backrest support</dd><dt>5</dt><dd>backrest</dd><dt>6</dt><dd>seat</dd><dt>6a</dt><dd>front seat half</dd><dt>6b</dt><dd>rear seat half</dd><dt>7</dt><dd>seat support</dd><dt>8th</dt><dd>sliding guide</dd><dt>9</dt><dd>axis</dd><dt>10</dt><dd>sliding guide</dd><dt>11</dt><dd>slot</dd><dt>12</dt><dd>axis</dd><dt>13</dt><dd>Front seat edge</dd><dt>14</dt><dd>arrow</dd></dl><dl tsize="9" compact="compact"><dt>A</dt><dd>axis of rotation</dd><dt>from</dt><dd>distance</dd><dt>α, β</dt><dd>angle of inclination</dd><dt>D1 to D3</dt><dd>pivot point</dd><dt>V</dt><dd>vertical</dd></dl>