DE20000612U1 - Seating - Google Patents

Description

F:\IJBDHF\DHFANM\ALLO818

Applicant:

Mr Wolfgang Frank

Büchel Street 2 0

71540 Murrhardt/Siegelsberg

General power of attorney: 3.5.5. No.95/95 AV

1443 033 14.01.2000

ste / str

Title: Seating Description

The invention relates to a piece of seating furniture with a frame, a seat cushion, optionally a backrest and an adjustment mechanism for the height of the seat cushion.

Seating furniture in which the seat cushion can be adjusted in height is well known. For example, office chairs have gas pressure springs with which the height of the seat cushion can be continuously adjusted. To do this, the pre-tensioned gas pressure spring only needs to be unlocked in order to raise the seat cushion.

The invention is based on the object of providing a piece of seating furniture which has additional functions in addition to seat height adjustment.

This object is achieved according to the invention with a piece of seating furniture of the type mentioned at the outset in that the adjustment mechanism has an adjustment scissor with two scissor arms, the two scissor arms are connected to one another via a joint, the joint divides the scissor arms into two arm sections and one arm section of one scissor arm is attached to the seat cushion and one arm section of the other scissor arm is attached to the frame or also to the seat cushion and one arm section or the joint is coupled to an adjustment drive. Instead of the seat cushion, the scissor arms can also engage a holder or a receptacle for the seat lock; this has the advantage that the seat cushion is easy to replace. The invention is described below in such a way that the scissor arms engage the seat cushion, with the other solution being equivalent.

In the seating furniture according to the invention, the seat cushion is raised or lowered using an adjustment scissor. For this purpose, the adjustment scissor is equipped with two scissor arms that are connected to each other via a joint. If the scissor arms are adjusted against each other, then

the seat cushion, which is connected to at least one of the upper arm sections, can be raised or lowered. The adjustment of the adjustment scissors is carried out by means of an adjustment drive, which either acts on the joint or on one of the arm sections and is supported on the frame of the seating furniture. The adjustment drive can also act on both arm sections. The seating furniture can be an armchair, a sofa, a chair or a stool.

In a further development, one arm section of each of the two scissor arms, namely the two lower arm sections, is supported on the floor by a runner or roller. These two arm sections form the feet of the seating furniture. The roller provided at one end of the arm section enables the seating furniture to be easily transported and the adjustment of the scissor arm to be made without any problems, as it reduces the frictional resistance to a minimum during the adjustment process, in which the free ends of the lower arm sections change their distance from one another. The runner allows the free end of the other arm section to roll to a limited extent, which is necessary when adjusting the adjustment of the scissor arm, as the inclination of the two adjustment arms changes.

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Preferably, the arm section of one scissor arm is pivotably fixed to the frame and an arm section of the other scissor arm is pivotably and slidably guided on the frame. In this embodiment, the adjustable scissors do not form a base frame but are fixed to the frame with their lower end. The frame sits directly on the floor.

In further developments, the movable scissor arm is mounted in a slot, a slot or on a rail. This allows the end of the movable arm section to be brought into the desired position, which not only allows the desired height of the seat cushion to be set, but also the desired inclination and seat depth. However, the seating furniture must be designed accordingly for this, in particular, the seat cushion must be movable in its plane for different seat inclinations, and for different seat inclinations, either the frame must be tiltable or the seat cushion must be pivotable.

In one embodiment, the arm section hinged to the seat cushion engages the seat cushion in a front area. This has the significant advantage that when adjusting the

The adjustment scissors allow you to adjust not only the height of the seat cushion but also the seat depth and the angle of the seat cushion. The rear section of the seat cushion moves more or less far under the backrest or protrudes from it.

In order to achieve the smoothest possible adjustment, the adjustment drive is formed by a tension spring, a gas spring or a motor drive. Tension and gas pressure springs are relatively simple, safe and inexpensive components. These drives are guaranteed to provide trouble-free service over the lifetime of the seating. A motor drive has the significant advantage that it can be used to adjust in both directions, i.e. the seating can be adjusted to the desired settings without the need for external force.

If a tension spring or a gas pressure spring is used as the adjustment drive, then it is pre-tensioned in such a way that the seat cushion is moved upwards when the spring is released. If the spring is released when the seat cushion is loaded, i.e. when a person is sitting on it, then it is pre-tensioned again when the seat cushion is pressed down.

The spring is released by means of a locking mechanism, which has, for example, an adjustment slot in which a latch can be moved. The adjustment slot defines several rest positions that are assigned to the end positions and, if necessary, several intermediate positions. In one embodiment, a Bowden cable is actuated via the locking mechanism, which is used to control, for example, a gas pressure spring.

Another variant provides for the adjustment mechanism to be located on the underside of the seat cushion and for the seat cushion to be lifted to release the lock. This is particularly advantageous for stools, as these then do not require an operating lever.

In a preferred variant, the joint divides the scissor arms unevenly and the short arm sections are arranged at the front, i.e. facing the edge of the seat. In this way, the inclination of the seat cushion is also adjusted when the seat height is adjusted. In addition, the seat depth is changed when the height is adjusted.

The invention is further characterized in one embodiment in that two free ends of the arm sections are mounted on two rails. The lower rail is mounted on the frame and the upper rail on the

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Seat cushion attached. If the adjustment scissors are operated, the relative positions of the rails change, which shifts the seat cushion relative to the frame. This can result in a change in height, a change in inclination and/or a change in the seat depth. The backrest can be attached to the rear end of the upper rail so that when the position changes, it moves along with the seat cushion. The rails can be made straight or curved.

In addition, the backrest can be adjustable in its inclination or the backrest can be removed. The backrest is preferably pre-tensioned forwards by means of a spring.

Further advantages, features and details of the invention emerge from the subclaims and the following description, in which particularly preferred embodiments are described in detail with reference to the drawing. The features shown in the drawing and mentioned in the description and/or in the claims can each be essential to the invention individually or in any combination.

In the drawing show:

Fig. 1 to 3: a first embodiment of the invention, wherein the adjustment mechanism assumes three different positions;

Fig. 4 to 6: a second embodiment of the invention, wherein a gas pressure spring is provided as the adjustment drive;

Fig. 7 to 9: a third embodiment, in

in which the adjustment scissors are provided between the seat cushion and a frame;

Fig. 10 and 11: a fourth embodiment, in which

on which the adjustable scissors are mounted on two rails; and

Fig. 12 and 13: a top view of the adjustable scissors with different positions of the scissor arms.

In the embodiment of Fig. 1 to 3, reference numeral 10 designates a piece of seating furniture which can either

is designed as an armchair 12 or as a stool 14. The armchair 12 has a frame 16, on which side walls 18 are provided, between which a seat cushion 20 is slidably mounted. For this purpose, in the lower region 22 of a backrest, designated overall by 24, the frame 16 has a support 26, on which a rear section 28 of the seat cushion 20 rests. Immediately above the rear section 28, the seat cushion 20 is overlapped by a projection 30 of the backrest 24 or by a cushion, so that the support 26 is not visible. In addition, the rear section can be pushed under the projection 30. The backrest also has an upper region 32, which is pivotably mounted on the lower region 22 via a bearing 34, e.g. by means of a spring 36. The upper region 32 can be pivoted backwards in a spring-loaded manner and assume the position shown in dashed lines for the upper region 32'.

An adjustable scissor 38 is also fixed to the frame 16, which has two scissor arms 40 and 42. These two scissor arms 40 and 42 are connected to one another via a joint 44, whereby this joint 44 divides the scissor arm 40 into an arm section 46 and an arm section 48 and the scissor arm 42 into an arm section 50 and an arm section 52. The two arm sections 46 and

50 rest with their free ends on the ground 54, the free end of the arm section 46 being provided with a runner 56 and the
free end of the arm section 50 is provided with a roller 58. The free end of the arm section 52 is pivotally mounted on the
Frame 16 is mounted on a bearing 60. The free end of the
Arm section 48 is mounted in a slot 62 and
also via a tab 64 with the underside of the
seat cushion 20. At the free end of the arm section 48, an adjustment mechanism 66 is also engaged, which comprises a hand lever 68, a latch 70 and a pull lever 72.
A tension spring 74 engages the tension lever 72, the
other end is attached to the frame 16. This tension spring 74 acts with its tensile force via the tension lever 72 in such a way
the adjustment mechanism 60, that the hand lever 68
down and thereby the locking pawl 70 (in the direction of the
clockwise) around the slot 62 and whose free end is held stable in a guide 76.

This link 76 has three rest positions A, B and C, whereby in Figure 1 the hand lever 68 is in the deflected, ie
operated position. The free end of the
Latch 70 is located above the rest position C, which defines the lowest seat height, the greatest seat inclination and the
represents the greatest seat depth. In the position shown in Figure 1
deflected position of the hand lever 68, the latch 70 is moved from the area C to the areas B or A

moves, whereby the free end of the arm section 48 is also moved backwards in the slot 62. During this movement, the adjustment scissors 38 close, i.e. the angle between the two arm sections 48 and 52 is reduced. This has the effect that, on the one hand, the frame 16 is raised via the bearing 60 and the slot 62, and by moving the free end of the arm section 48 backwards in the slot 62, the seat cushion 20 is also moved backwards in the direction of the lower area 22 of the backrest 24 and the seat inclination and the seat depth of the seat cushion 20 are reduced, i.e. the rear area of the seat cushion 20 is raised further than its front area. This is caused by the arm section 52 being longer than the arm section 48. In addition, the arm section 46 is longer than the arm section 50.

Figure 2 shows the chair 12 in an intermediate position in which the latch 70 assumes the rest position B in the guide 76. It is clearly visible that the seat inclination and the seat depth are smaller and that the seat height is greater than in the position in Figure 1.

In Figure 3, the chair 12 is shown in its fully raised position, in which the seat cushion 20 is almost horizontal. In this position, the

Latch 70 in the rest position A of the guide 76 and the seat cushion 20 is pushed far under the projection 30 of the backrest 24, which corresponds to a small seat depth.

Figures 1 to 3 also show the seating furniture designed as a stool 14, in which an adjusting scissor 138 is also provided in order to change the height and inclination of the seat cushion 120. The adjusting scissor 138 is structurally equivalent to the adjusting scissor 38 and the free end of the arm section 148 engages directly in the guide 176. The free end of the arm section 148 assumes either the rest positions A, B or C.

The free end of the arm section 148 is moved out of these rest positions by lifting the end of the seat cushion 120 having the guide 176. If the free end of the arm section 148 is in the rest position B or C, the free arm section 148 is moved by the tension spring 174 in the direction of the rest position A.

This increases the seat height and reduces the seat inclination. The weight of the seat cushion 20 ensures that the free end of the arm section 148 is in a stable position in the guide 176. The seat cushion 20 and the backrest 24 do not shift within the frame 16.

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Figures 4, 5 and 6 also show an armchair 12 and a stool 14, with only the elements which are alternatives to the embodiment in Figures 1 to 3 being described below. In the embodiment in Figures 4 to 6, the seat cushion 20 rests on a support 26 which extends over the entire depth of the frame 16, so that the seat depth can be adjusted manually by moving the seat cushion 20 on this support 26 and independently of the seat height and seat inclination. The arm section 48 of the adjusting scissors 38 engages a joint 60 which is provided in the front area of the frame 16. The arm section has a roller 78 at its free end and is slidably mounted in a slot 62 in the frame 16.

In this embodiment, the adjustable scissors 38 are driven by a gas pressure spring 80, which acts on the frame 16 on the one hand and on the joint 44 on the other. However, it is also conceivable that the gas pressure spring 80 is articulated on the frame 16 and an arm section or on two arm sections. The gas pressure spring 80 is controlled by a Bowden cable 82, which is actuated by means of the hand lever 68. In Figure 4, the hand lever 68 assumes its working position, i.e. it is actuated. In this case, the gas pressure spring 80 is unlocked, so that the piston rod extends from the gas pressure spring 80. This causes the joint

44 from the articulation point of the gas pressure spring 80 on the frame 16, whereby the two scissor arms 40 and 42 close, as shown in Figures 5 and 6. The roller 78 moves forward within the slot 62, whereby the rear part of the frame 16 is raised and the inclination of the seat cushion 20 is thereby reduced. In Figure 6, the chair 12 assumes its fully raised position, whereby the seat cushion is pushed in towards the backrest 24. The rear section 28 engages under the projection 30 of the backrest 24.

In Figures 4 and 6, the two end positions for the adjustable scissors 38 are shown, whereby each intermediate position can be continuously adjusted.

The stool 14 is also equipped with an adjustment scissor, which is driven by a gas pressure spring 180. Here, too, all intermediate positions between the two end positions shown are possible. It is clearly visible that not only the height of the seat cushion 120 changes, but also its inclination.

In the embodiment of Figures 7 to 9, the frame 16 rests on the floor 54 and the seat cushion 20 rests completely on the adjustment scissors 38. For this purpose,

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The seat cushion is provided with a joint 84 and an elongated hole 86 which are connected to the free end of the arm section 48 and the arm section 52 respectively. The free end of the arm section 52 is also provided with a roller 88. The free end of the arm section 50 engages the bearing 60 and the free end of the arm section 46 can be moved in the elongated hole 62 via the roller 78. The gas pressure spring 80 engages the joint 44 with its piston rod and is in turn pivotably attached to the frame 16. The Bowden cable 82 is actuated via the hand lever 68 and the gas pressure spring 80 is unlocked. This causes the bearing 44 to be moved continuously from its lowest position shown in Figure 7 via all intermediate positions to its uppermost position shown in Figure 9, as a result of which the seat height and the inclination of the seat cushion 20 change continuously. The seat cushion 20 and the backrest 24 adjust their height and inclination within the frame 16.

In the embodiment of Fig. 10 and 11, in which the frame 16 is shown without rollers (Fig. 10) and alternatively with rollers 90 (Fig. 11), the adjustable scissors 38 are attached to two rails 92 and 94. The free end of the arm section 46 is pivotable on a bearing 96, and the free end of the arm section 50 is attached to a carriage 98 slidably mounted on the rail 92.

Furthermore, the arm section 52 is attached to a bearing 100 and the arm section 48 to a second carriage 102, wherein the carriage 102 is also slidably mounted on the rail 94. The carriage 102 is also coupled to the seat cushion 20 via the tab 64. Furthermore, the hand lever 68 is pivotally mounted on the tab 64, wherein the adjustment mechanism 66 essentially corresponds to the structure of the embodiment of Figs. 1 to 3, so that a more detailed description is unnecessary.

The link 76 has two rest positions A and B, whereby the rest position B corresponds to the lower position of the seat cushion 20 and the rest position A corresponds to the raised position of the seat cushion 20. In this embodiment, too, the lengths of the two arm sections 48 and 50 are shorter than the lengths of the two arm sections 46 and 52. As a result, the seat cushion 20 is not only raised but also adjusted in its inclination. As the seat cushion is moved, the inclination of the backrest 24 also changes.

The backrest 24 is attached to the rear end of the rail 94 so that the backrest 24 is raised together with the seat cushion 20.

10 and 11 also show a further embodiment of the stool 14, in which an elongated hole 104 and a guide 106 are provided on the seat cushion 120. The free ends of the arm sections 148 and 152 are supported in the elongated hole 104 and in the guide 106. The height of the seat cushion 120 is also adjusted in this embodiment by lifting the seat cushion 120 in the area of the guide 106, so that the free end of the arm section 148 can be moved from the rest position B to the rest position A. Both rest positions are stable in this embodiment as well. This stool 14 is particularly simple in construction, since the adjustment scissors have no joint and therefore the scissor arms cannot be pivoted against each other.

In Fig. 12 and 13, the joint 44 of the adjustable scissors 38 is shown in section. The view in Fig. 12 corresponds essentially to a plan view of the adjustable scissors 38 of the chair 12 according to Fig. 1, and the view in Fig. 13 corresponds essentially to a plan view of the adjustable scissors 38 of the chair 12 according to Fig. 3.

To form the joint 44, the scissor arm 40 is provided with an orthogonal bore 108 into which a stud bolt 110 is inserted. The stud bolt 110 has

a protruding section 112 on which the scissor arm 42 is mounted. For this purpose, the scissor arm is provided with an orthogonal bore 114 which accommodates a spherical bearing 116 of the section 112. On both sides of the bearing 116 there is a shoulder 118 which fixes the bearing 16 in the bore 114.

If the adjustable scissors 38 are now adjusted, the angular positions of the two scissor arms 40 and 42 change, and the spherical bearing 116 is not only rotated but also pivoted within the bore 114. This means that the angle between the axis of the stud bolt 110 and the longitudinal axis of the scissor arm 42 changes. Due to the rotatable and pivotable mounting of the scissor arm 42 on the stud bolt 110, a change in the position of the two scissor arms 40 and 42 in space is possible.

The seating furniture according to the invention has, as described above, a seat cushion 20, which can be easily changed in terms of height, inclination and seat depth. The seating furniture 10 can thus be changed from an armchair 12 to a chair.

Claims (23)

1. Seating furniture with a frame ( 16 ), a seat cushion ( 20 , 120 ), optionally a backrest ( 24 ), and an adjustment mechanism ( 66 ) for the height of the seat cushion ( 20 , 120 ), characterized in that the adjustment mechanism ( 66 ) has an adjustment scissor ( 38 , 138 ) with two scissor arms ( 40 , 42 ), the two scissor arms ( 40 , 42 ) are connected to one another via a joint ( 44 ), the joint ( 44 ) divides the scissor arms ( 40 , 42 ) into two arm sections ( 46 to 52 , 146 to 152 ), and an arm section of one scissor arm is attached to the seat cushion ( 20 , 120 ) and an arm section of the other scissor arm is attached to the frame ( 16). ) or also attached to the seat cushion ( 120 ), and an arm section or the joint ( 44 ) is coupled to an adjustment drive. 2. Seating furniture according to claim 1, characterized in that an arm section ( 46 , 50 ) of each of the two scissor arms ( 40 , 42 ) is supported on the floor ( 54 ) via a runner ( 56 ) or a roller ( 58 ). 3. Seating furniture according to claim 1, characterized in that a section ( 48 ) of one scissor arm ( 40 ) is pivotally fixed to the frame ( 16 ) and an arm section ( 52 ) of the other scissor arm ( 42 ) is pivotally and displaceably guided on the frame ( 16 ). 4. Seating furniture according to claim 3, characterized in that the displaceably guided scissor arm ( 42 ) is mounted in a guide, an elongated hole ( 62 ) or on a rail ( 94 ). 5. Seating furniture according to one of the preceding claims, characterized in that the arm section ( 48 ) hinged to the seat cushion (20) engages the seat cushion ( 20 ) in a front region. 6. Seating furniture according to one of the preceding claims, characterized in that the adjustment drive is a tension spring ( 74 , 174 ), a gas pressure spring ( 80 , 180 ) or a motor drive. 7. Seating furniture according to claim 6, characterized in that the spring ( 74 , 174 , 80 , 180 ) is prestressed such that the seat cushion ( 20 , 120 ) is displaced upwards when the spring ( 74 , 174 , 80 , 180 ) is released. 8. Seating furniture according to one of the preceding claims, characterized in that the adjustment mechanism ( 66 ) is provided with a locking device. 9. Seating furniture according to claim 8, characterized in that the locking mechanism has an adjustment link ( 76 , 106 , 176 ). 10. Seating furniture according to claim 8 or 9, characterized in that the locking mechanism is connected to a latch ( 70 ) connected to the arm section ( 48 , 148 ) hinged to the seat cushion ( 20 , 120 ). 11. Seating furniture according to claim 9 and 10, characterized in that the locking pawl ( 70 ) engages in the adjustment link ( 76 , 176 ). 12. Seating furniture according to claim 10 or 11, characterized in that the latching pawl ( 70 ) is urged into at least one rest position (A, B, C) by means of a spring ( 74 , 174 ) within the adjustment link ( 76 , 176 ). 13. Seating furniture according to one of the preceding claims, characterized in that the seat cushion ( 20 , 120 ) is mounted with its rear section ( 28 ) in a substantially horizontally extending sliding guide. 14. Seating furniture according to claim 13, characterized in that the sliding guide is provided on the lower portion ( 22 ) of the backrest ( 44 ). 15. Seating furniture according to one of the preceding claims, characterized in that the joint ( 44 ) divides the scissor arms ( 40 , 42 ) unevenly and the short arm sections are arranged at the front. 16. Seating furniture according to one of the preceding claims, characterized in that when the height of the seat cushion ( 20 , 120 ) is adjusted, its inclination and/or its seat depth changes. 17. Seating furniture according to claim 8, characterized in that the seat cushion ( 120 ) can be lifted to release the locking mechanism. 18. Seating furniture according to one of the preceding claims, characterized in that the backrest ( 24 ) is adjustable in its inclination. 19. Seating furniture according to one of the preceding claims, characterized in that the backrest ( 24 ) is removable. 20. Seating furniture according to one of the preceding claims, characterized in that the backrest ( 24 ) is pre-tensioned forwards by means of a spring ( 36 ). 21. Seating furniture according to one of the preceding claims, characterized in that two free ends of the arm sections ( 46 to 52 ) are mounted on two rails ( 92 , 94 ). 22. Seating furniture according to claim 21, characterized in that the lower rail ( 92 ) is attached to the frame ( 16 ) and the upper rail ( 94 ) is attached to the seat cushion ( 20 ). 23. Seating furniture according to claim 22, characterized in that the backrest ( 24 ) is attached to the rear end of the upper rail ( 94 ).