SEATING FURNITURE WITH TELESCOPIC LEG REST ELEMENT

Description

[0001] The invention relates to a piece of seating furniture with a telescopic leg rest element, with a seat part, a back part, a chassis and a leg rest pivotally connected to the seat part and / or the chassis, wherein the seating furniture is adjustable between a sitting and a lying position, wherein the leg rest is pivoted in substantially below the seat part in the sitting position and pivoted out in front of the seat part in the lying position such that the seat part is extended by the leg rest, wherein the leg rest comprises two rails pivotally hinged to the seat part, on which rails the telescopic leg rest element is arranged so as to be movable in the longitudinal direction of the rails, wherein the leg rest element is retracted when the leg rest is pivoted in and extended when the leg rest is pivoted out to increase the length of the leg rest.

[0002] Such seating furniture typically features continuous upholstery extending across the seat and leg rest. For an attractive design, the seat's adjustment mechanism must be designed so that the upholstery is taut when the leg rest is extended.

[0003] To achieve this, the leg rest must be pivoted and extended at the same time when unfolding.

[0004] WO2014 / 071924A1 discloses a piece of seating furniture in which this task is solved by a two-part leg rest, with the parts of the leg rest being movable relative to each other when pivoted. Another piece of seating furniture is known from DE202004016889U1.

[0005] To pivot the leg rest and to transfer the parts of the pivoted leg rest that are retracted in the sitting position into the extended position in the lying position, a lever adjustment mechanism is used in the known seating furniture, whereby in particular in the Fig. 5 The disadvantage of the variant shown in the above-mentioned publication, with a leg rest pivoted in approximately parallel to the seat part, is that the extended parts of the pivoted-out leg rest are not pulled out far enough, so that a continuous upholstery extending over the seat part and leg rest is not optimally tightened when the leg rest is folded out.

[0006] Another disadvantage is that, when the leg rest is in an approximately vertically aligned intermediate position, the extended parts of the pivoting leg rest are already extended by about half compared to the pivoted end position, so that the length of the extended parts of the leg rest is restricted because they have to pass the floor during pivoting.

[0007] In combination with the above-mentioned disadvantage of the parts of the swivelled-out leg rest not being extended far enough, this limits the overall length of the unfolded leg rest and thus the lying comfort for the user.

[0008] Based on the described prior art, the invention is based on the object of developing a piece of seating furniture of the generic type in such a way that the lying comfort of the seating furniture is improved.

[0009] The above object is achieved according to the invention by a piece of seating furniture with a telescopic leg rest element having the features listed in patent claim 1.

[0010] The features according to the invention make it possible to provide a piece of seating furniture of the generic type in which a leg rest element is arranged to be movable in the longitudinal direction of two rails hinged to the seat part in such a way that the leg rest element is not adjusted or is adjusted only slightly relative to the rails when the leg rest is pivoted out approximately halfway and aligned vertically.

[0011] Only in approximately the second half of the pivoting of the leg rest from the sitting to the lying position is the leg rest element moved into an extended position relative to the rails according to the invention, which enables the use of a leg rest element that is longer than the seating furniture known from WO2014 / 071924A1.

[0012] At the same time, a lever geometry according to the invention of the lever adjustment mechanism used to pivot the leg rest and to transfer the leg rest element into the retracted / extended position enables a larger travel path compared to the seating furniture known from WO2014 / 071924A1, so that the leg rest element can be extended further relative to the rails.

[0013] An embodiment of the invention is described below with reference to the accompanying drawing. Fig. 1 shows a seating furniture according to the invention in the reclining position of the seating furniture; Fig. 2 shows a seating furniture according to the invention in the sitting position of the seating furniture; Fig. 3 shows a seating furniture according to the invention according to Fig. 2 , in the seat inclination adjusted; Fig. 4 a seating furniture according to the invention according to Fig. 3 with partially pivoted leg rest; Fig. 5 a seating furniture according to the invention with the seat part adjusted in inclination and the leg rest pivoted out; Fig. 6 a seating furniture according to the invention according to Fig. 5 in a detailed view; Fig. 7 a seating furniture according to the invention according to Fig. 2 in a detailed view.

[0014] The representations in the drawing essentially show only the mechanism of the seating furniture 1 according to the invention without the parts that are not of interest here, such as upholstery in particular.

[0015] Some of the components mentioned below are present twice due to a largely mirror-image structure of the mechanism of the seating furniture 1, whereby these components are referred to in the singular below, whereby both components are meant in each case.

[0016] A seating furniture 1 according to the invention consists of a chassis 5, a seat part 3, a back part 4 and a leg rest 6 pivotably connected to the seat part 3, wherein the seating furniture 1 can be moved from a seating position displaced to the rear edge of the seating furniture 1 ( Fig. 2 ), in which the leg rest 6 is pivoted essentially below the seat part 3, into a reclining position shifted to the front edge of the seating furniture 1 ( Fig. 1 ) is adjustable, in which the leg rest 6 is pivoted out in front of the seat part 3 in such a way that the seat part 3 is extended by the leg rest 6.

[0017] The terms "front edge of the seat" and "back edge of the seat" refer to the perspective of a person sitting on the seat with their legs facing forward and their back facing backward.

[0018] The leg rest 6 is formed in two parts, wherein one part of the leg rest 6 is formed by two rails 9 pivotably connected to the seat part 3 and another part is formed by a telescopic leg rest element 2 which is arranged to be movable in the longitudinal direction of the rails 9, wherein the telescopic leg rest element 2 is retracted when the leg rest 6 is pivoted in ( Fig. 2 , Fig. 3 , Fig. 7 ) and when the leg rest 6 is swung out, it is pulled out to increase the length of the leg rest 6 ( Fig. 1 , Fig. 5 ).

[0019] A first 10 and / or a second articulated lever 11 is / are articulated on the seat part 3, wherein, in the sitting position of the seating furniture 1, a longitudinal axis formed between the two end articulation points 18, 19 of at least one of the first 10 and / or the second articulated lever 11 is arranged obliquely to the seat part 3 and the end articulation point 18 of this articulated lever facing the seat part 3 is positioned closer to a vertical plane spanned by the front edge 15 of the seat part than the end articulation point 19 of this articulated lever facing away from the seat part 3.

[0020] At least one of the first 10 and / or the second articulated lever 11 has a stop element 28 which, during the pivoting movement of the leg rest 6, comes into contact with a stop surface of a seat part tab 29 connected to the front area of ​​the seat part 3 ( Fig. 2 ).

[0021] The terms "the end articulation point facing the seat part" and "the end articulation point facing away from the seat part" each refer to the shortest distance of an end articulation point of an articulated lever to the seat part, whereby an end articulation point of an articulated lever facing the seat part has a shorter distance to the seat part than an end articulation point of this articulated lever facing away from the seat part.

[0022] The first 10 and / or the second articulated lever 11 are / is coupled to the telescopic leg rest element 2 in such a way that an adjustment of one of the first 10 and / or the second articulated lever 11 relative to the seat part 3 causes the leg rest 6 to pivot out or in relative to the seat part 3 and a simultaneous displacement of the telescopic leg rest element 2 along the rails 9.

[0023] The pivoting of the leg rest 6 is carried out according to the invention by means of a lever adjustment mechanism articulated on the seat part 3, wherein the first 10 and the second articulated lever 11 are each articulated on the one hand to a front area of ​​the seat part 3 and on the other hand each to a coupling lever 16, wherein, in the sitting position of the seating furniture 1, a third 12 and a fourth articulated lever 13 have an orientation in which a longitudinal axis formed between the two end articulation points 20, 21 of at least one of the third 12 and / or the fourth articulated lever 13 is arranged obliquely to the seat part 3 and the end articulation point 21 of this articulated lever facing away from the seat part 3 is positioned closer to a vertical plane spanned by the front edge 15 of the seat part than the end articulation point 20 of this articulated lever facing towards the seat part 3, wherein the third 12 and the fourth articulated lever 13 are each articulated on the one hand to the coupling lever 16 and on the other hand to your,In the sitting position of the seating furniture 1, the end articulation points 20, 22 facing the seat part 3 are each articulated to a fifth articulated lever 14, wherein one of the third 12 and / or the fourth articulated lever 13 is extended beyond its articulation point on the coupling lever 16 and is articulated at its free end to a first end of a control lever 17, the second end of which is articulated to a central region of one of the first 10 and / or the second articulated lever 11, wherein the fifth articulated lever 14 is articulated on the one hand to the third 12 and the fourth articulated lever 13 and on the other hand with its free end to the telescopic leg rest element 2.

[0024] In this context, "a central region of the articulated lever" does not mean the exact geometric center, but rather the entire region of an articulated lever lying between the two end joint points.

[0025] During the adjustment of the seating furniture 1 from the sitting to the lying position, the first 10 and / or the second articulated lever 11 are pivoted in such a way that the coupling lever 16 is pushed forward relative to the seat part 3, wherein at the same time the third 12 and the fourth articulated lever 13 are pivoted relative to the coupling lever 16 and the fifth articulated lever 14 is pushed forward relative to the coupling lever 16.

[0026] Due to the arrangement according to the invention and the additive pivoting movements of the first 10 and / or the second articulated lever 11 on the one hand and the third 12 and / or the fourth articulated lever 13 on the other hand, in which during the adjustment of the seating furniture 1 from the sitting to the lying position one of the first 10 and / or the second articulated lever 11 is pivoted relative to one of the third 12 and / or the fourth articulated lever 13 by an angle of preferably more than 200°, a large travel path for the lever adjustment mechanism is achieved overall.

[0027] According to the invention, the first 10 and / or the second articulated lever 11 on the one hand and the third 12 and / or the fourth articulated lever 13 on the other hand are arranged such that during approximately a first half of the pivoting of the seating furniture 1 from the sitting to the lying position, the coupling lever 16 is lowered relative to the seat part 3, wherein at the same time all sections of the fifth articulated lever 14 are raised relative to the coupling lever 16.

[0028] The lowering of the coupling lever 16 is thus virtually compensated by a simultaneous raising of the fifth articulated lever 14 relative to the coupling lever 16, whereby the articulation point of the fifth articulated lever 14 on the telescopic leg rest element 2 follows an almost linear, or a "flat" movement curve near the front edge 15 of the seat part during a first phase of the pivoting from the sitting to the lying position.

[0029] This achieves according to the invention that during approximately the first half of the adjustment of the seating furniture 1 from the sitting to the lying position, the leg rest 6 is pivoted and the leg rest element 2 is not or only slightly displaced relative to the rails 9 ( Fig. 4 ).

[0030] Only when the leg rest 6 is pivoted further in the direction of the reclining position of the seating furniture 1 is the leg rest element 2 moved in the longitudinal direction of the rails 9 until the extended end position is reached ( Fig. 1 , Fig. 5 , Fig. 6 ).

[0031] The inventive effect of a "flat" movement curve of the articulation point of the fifth articulated lever 14 on the telescopic leg rest element 2 enables the use of a leg rest element 2 that is significantly longer than the known, generic seating furniture (see document WO2014 / 071924A1), so that in combination with the above-mentioned large travel path of the lever adjustment gear, a particularly long leg rest surface according to the invention, in the pivoted-out position of the leg rest 6, and thus increased lying comfort for the user, can be provided.

[0032] During the adjustment of the seating furniture 1 from the sitting to the lying position, the seat part 3 is moved forward relative to the chassis 5 via a pivoting guide 26 and at the same time is adjusted in its inclination, wherein the pivoting guide 26 has a front 7 and a rear link lever 8, which form a four-bar linkage with the seat part 3 and the chassis 5 ( Fig. 5 ).

[0033] The adjustment movement of the seat part 3 towards the front edge of the seating furniture 1 is blocked by a chassis-side stop element 27 ( Fig. 5 ).

[0034] The pivot guide 26 is subjected to force by means of at least one tension spring 25, wherein the tension spring 25 acts between the seat part 3 and the chassis 5 in such a way that the tension spring 25 shortens during the adjustment movement of the seat part 3 in the direction of the front edge of the seating furniture 1 ( Fig. 2 , Fig. 6 ).

[0035] A linear actuator 23 is coupled at a first end to the chassis 5 and at a second end to the first 10 and / or the second articulated lever 11 via a cross strut 24 connected to the first 10 or the second articulated lever 11 ( Fig. 6 ).

[0036] In the initial position or the sitting position of the seating furniture 1, the leg rest 6 is held in the pivoted-in end position by the linear actuator 23 articulated between the chassis 5 and the cross strut 24 by means of the stop element 28 acting between the seat part tab 29 and the first 10 and / or the second articulated lever 11.

[0037] The linear actuator 23 generates a linear stroke when actuated, consisting of at least a first and a second partial stroke, wherein the linear actuator 23, with a first partial stroke, starting from the sitting position of the seating furniture 1, by means of the pivot guide 26, causes a displacement of the seat part 3 relative to the chassis forwards and a simultaneous inclination adjustment of the seat part 3 until the rear link lever 8 of the pivot guide 26 comes into contact with the chassis-side stop element 27 and the pivot guide 26 is thereby blocked, wherein during this first partial stroke of the linear actuator 23, no pivoting out or in of the leg rest 6 relative to the seat part 3 takes place ( Fig. 3 ).

[0038] The tension spring 25 shortens during this first adjustment step and thereby supports the adjustment movement of the seat part 3, whereby the seat part 3 is first adjusted without pivoting the leg rest 6 relative to the seat part 3.

[0039] At the end of the first adjustment step, the front edge of the seat part 3 has a greater distance from the standing plane of the seating furniture 1 than in the sitting position of the seating furniture 1, which allows the use of a longer leg rest 6 due to a larger available pivoting space.

[0040] The further advantage of this first intermediate position of the seating furniture 1, which is reached at the end of the first adjustment step, is the possibility for the user to perform an additional adjustment function, also referred to as a "lounge position", compared to the seating furniture known from WO2014 / 071924A1 ( Fig. 3 ).

[0041] Thus, a piece of seating furniture according to the present invention offers, in a structurally simple manner, on the one hand the advantage of a longer leg rest 6 compared to the generic seating furniture and thus of improved lying comfort, and on the other hand the advantage of improved seating comfort due to the possibility for the user to adopt a more relaxed sitting position compared to the sitting position of the seating furniture.

[0042] In a second adjustment step of the seating furniture 1 from the sitting to the lying position, effected by a second partial stroke of the linear actuator 23, while maintaining the inclination and displacement position of the seat part 3 relative to the chassis 5 achieved at the end of the first partial stroke and maintaining the position of the back part 4 relative to the seat part 3, the leg rest 6 is pivoted out relative to the seat part 3 until the leg rest 6 has reached the pivoted-out end position and the seating furniture 1 has thus reached a second intermediate position, also referred to as the "relaxation position" ( Fig. 5 , Fig. 6 ).

[0043] In the reverse direction of adjustment, i.e. in the direction of the seating position of the seating furniture 1, the functional sequence described above takes place in reverse order: Starting from the "relaxation position" of the seating furniture 1, upon actuation of a first partial stroke of the linear actuator 23, the leg rest 6 is first pivoted in due to the spring force of the tension spring 25 that must be overcome until the pivoted-in end position is reached by means of the stop element 28 acting between the seat part tab 29 and the first 10 and / or the second articulated lever 11. Upon actuation of a second partial stroke of the linear actuator 23, the seat part 3 is displaced relative to the chassis 5 in the direction of the rear edge of the seating furniture 1 against the spring force of the tension spring 25 until the seating position of the seating furniture 1 is reached.

[0044] The invention is not limited to the embodiment, but is variable in many ways within the scope of the disclosure.

Claims

1. Seating furniture (1) comprising a seat part (3), a back part (4), a chassis (5) and an at least two-part leg rest (6) pivotably connected to the seat part (3) and / or to the chassis (5), - the parts of the leg rest (6) being displaceable relative to one another during the pivoting, - the seating furniture (1) being adjustable between a sitting and a lying position, - for which purpose the leg rest (6) is pivoted in substantially below the seat part (3) in the sitting position and is pivoted out in front of the seat part (3) in the lying position in such a way that the seat part (3) is extended by the leg support (6), - part of the leg rest (6) being formed by a telescopic leg rest element (2) which is pulled in when the leg rest (6) is pivoted in and pulled out to increase the length of the leg rest (6) when the leg rest (6) is pivoted out, wherein, - in the sitting position of the seating furniture (1), a first (10) and / or a second articulation lever (11) are articulated to the seat part (3) and / or to the chassis (5), and a longitudinal axis, formed between the two end articulation points (18, 19) of at least one of the first (10) and / or the second articulation lever (11), is arranged oblique to the seat part (3), and thus the end articulation point (18) of this articulation lever facing the seat part (3) is positioned closer than the end articulation point (19) of this articulation lever remote from the seat part (3) to a vertical plane spanned by the seat part front edge (15), - a third (12) and a fourth articulation lever (13) having, in the sitting position of the sitting furniture (1), an orientation in which a longitudinal axis, formed between the two end articulation points (20, 21) of at least one of the third (12) and / or the fourth articulation lever (13), is arranged oblique to the seat part (3), and thus the end articulation point (21) of this articulation lever facing the seat part (3) is positioned closer than the end articulation point (20) of this articulation lever remote from the seat part (3) to a vertical plane spanned by the seat part front edge (15), - the third (12) and fourth articulation lever (13) being respectively connected via their end articulation points (20, 22) facing the seat part (3) in the sitting position of the seating furniture (1) to a fifth articulation lever (14), - a coupling lever (16) being articulated to the first (10) and / or second articulation lever (11) and / or to the third (12) and / or fourth articulation lever (13), and - a control lever (17) being articulated to at least one of the first (10), the second (11), the third (12) and the fourth articulation lever (13), - the fifth articulation lever (14) being connected both to the third (12) and to the fourth articulation lever (13) and, via its free end in an articulated manner, to the telescopic lag rest element (2).

2. Seating furniture (1) according to claim 1, characterised in that, during a sub-phase of the pivoting of the seating furniture (1) from the sitting into the lying position, the coupling lever (16) is lowered with respect to the seat part (3), all portions of the fifth articulation lever (14) simultaneously being raised with respect to the coupling lever (16).

3. Seating furniture (1) according to either claim 1 or claim 2, characterised in that the first (10) and the second articulation lever (11) are each articulated both to a front region of the seat part (3) and to the coupling lever (16), the third (12) and the fourth articulation lever (13) are each articulated both to the coupling lever (16) and to the fifth articulation lever (14), and one of the third (12) and / or the fourth articulation lever (13) is extended beyond its articulation point to the coupling lever (16) and articulated at its free end to a first end of the control lever (17), the second end of which is connected in an articulated manner to a central region of one of the first (10) and / or the second articulation lever (11).

4. Seating furniture (1) according to at least one of the preceding claims, characterised in that the leg rest (6) comprises one or more rails (9), which are pivotably articulated to the seat part (3) and on which the telescopic leg rest element (2) is arranged movably in the longitudinal direction of the rails (9), at least one of the first (10) and / or the second articulation lever (11) being coupled to the telescopic leg rest element (2) in such a way that an adjustment of one of the first (10) and / or the second articulation lever (11) relative to the seat part (3) brings about outward or inward pivoting of the leg rest (6) relative to the seat part (3) and simultaneous displacement of the telescopic leg rest element (2) along the rails (9).

5. Seating furniture (1) according to at least one of the preceding claims, characterised in that at least one of the first (10) and / or the second articulation lever (11) has a stop element (28), which, during the pivoting movement of the leg rest (6), comes into contact with a stop surface of a seat part tab (29) connected to the front region of the seat part (3).

6. Seating furniture (1) according to at least one of the preceding claims, characterised in that - at least one linear actuator (23) for adjusting the seat part (3) and the leg rest (6) is provided, the linear actuator (23) when actuated generating a linear stroke consisting of at least a first and a second sub-stroke, - the linear actuator (23) bringing about, with a first sub-stroke, displacement of the seat part (3) relative to the chassis (5) and simultaneous inclination adjustment of the seat part (3), the leg rest (6) not pivoting out or in relative to the seat part (3) during this first sub-stroke of the linear actuator (23), - the linear actuator (23) bringing about, with a second sub-stroke, outward or inward pivoting of the leg rest (6) relative to the seat part (3) and simultaneous displacement of the telescopic leg rest element (2).

7. Seating furniture (1) according to at least one of the preceding claims, characterised in that with one sub-stroke the linear actuator (23) merely brings about outward or inward pivoting of the leg rest (6) relative to the seat part (3) without adjustment of the seat part (3) relative to the chassis (5) and without adjustment of the back part (4) relative to the seat part (3).

8. Seating furniture (1) according to at least one of the preceding claims, characterised in that the linear actuator (23) is coupled via a first end to the chassis (5) and via a second end to the first (10) and / or the second articulation lever (11), preferably via a cross-bar (24) connected to the first (10) or the second articulation lever (11).

9. Seating furniture (1) according to at least one of the preceding claims, characterised in that the seat part (3), at least during a sub-phase of the adjustment of the seating furniture (1) from the sitting to the lying position, is displaced forwards relative to the chassis (5) via a pivot guide (26), the pivot guide (26) having a front (7) and a rear steering lever (8) which together with the seat part (3) and chassis (5) form a four-bar linkage.

10. Seating furniture (1) according to at least one of the preceding claims, characterised in that the adjustment movement of the seat part (3) towards the front edge of the seating furniture (1) is blocked by a chassis-side stop element (27)11. Seating furniture (1) according to at least one of the preceding claims, characterised in that a force is applied to the pivot guide (26) by at least one tension spring (25), the tension spring (25) acting between the seat part (3) and the chassis (5) in such a way that the tension spring (25) shortens during the adjustment movement of the seat part (3) towards the front edge of the seating furniture (1).