Seating furniture with a standing aid

Abstract

The present invention relates to a seating furniture, comprising: a seat; a backrest having a headrest; a seat-back adjustment mechanism for adjusting the seat and the backrest from an upright initial position to a reclined position; a footrest having a footrest adjustment mechanism; a base frame for supporting the seating furniture on a standing surface, comprising a tilting mechanism for tilting the seating furniture; a standing assistance device for raising the seat and the backrest from the upright initial position to a raised position; an actuator for actuating the seat-back adjustment mechanism, the footrest adjustment mechanism, the tilting mechanism and the standing assistance device, wherein, starting from the upright initial position, actuation of the actuator in a first direction activates the standing assistance device, and actuation in an opposite second direction activates the footrest adjustment mechanism to extend the footrest and activates the seat-back adjustment mechanism to adjust the seat and the backrest to the reclined position, and starting from the reclined position, further actuation of the actuator in the second direction causes actuation of the tilting mechanism, which is used to tilt the seat and the backrest to a tilted position, and the tilting mechanism causes the footrest to be raised relative to the standing surface while the backrest is lowered relative to the standing surface.

Description

Technical Field

[0001] The present invention relates to a seat furniture with a standing assistance device. Background Art

[0002] The advantage of an armchair with a standing assistance device is that a remote controller or control buttons can be used to raise and move the armchair forward so that the user can easily get up from the seat cushion. This function is particularly gentle on the back because no sudden force is required to stand up. However, this mechanism can also make the user sit down particularly gently and comfortably.

[0003] Such armchairs are usually designed as so-called relaxation armchairs, which also offer the possibility of extending a footrest and reclining the backrest. Multiple actuators are usually used to achieve the various positions of the seat furniture. However, in order to reduce the electrical cost, it has also been proposed to use only one actuator to actuate the standing assistance device, the extension of the footrest, and the seat / backrest adjustment mechanism.

[0004] For example, a corresponding armchair is known from DE 20 2019 100 213 U1. Activation of the actuator in a first direction actuates the standing assistance device. On the other hand, if the actuator is actuated in a second direction starting from the upright basic position, on the one hand, the footrest is extended, and the seat and backrest are adjusted to the reclined position.

[0005] From practice, mechanical and motor-driven benches are also known, which allow reclining from the basic position so that the foot area is raised while the head area is lowered. In the reclined position, the head can be approximately at the level of the feet or even at the lowest position of the body. This body position is also called the Trendelenburg position. Summary of the Invention

[0006] Starting from this point, the object of the present invention is to further improve the comfort of the seat furniture without having to provide additional actuators.

[0007] According to the present invention, this object is achieved by a seat furniture having the following features:

[0008] a. A seat,

[0009] b. A backrest having an integrated or separate headrest,

[0010] c. A seat-backrest adjustment mechanism for adjusting the seat and the backrest from the upright initial position to the reclined position,

[0011] d. A footrest having a footrest adjustment mechanism for extending and retracting the footrest,

[0012] e. A base frame for supporting the seating furniture on a standing surface, wherein the base frame includes a tilting mechanism for tilting the seating furniture,

[0013] f. A standing assistance device for raising the seat and the backrest from an upright initial position to a raised position,

[0014] g. An actuator for actuating the seat-backrest adjustment mechanism, the footrest adjustment mechanism, the tilting mechanism and the standing assistance device, wherein

[0015] g1. - Starting from the upright initial position, actuation of the actuator in a first direction activates the standing assistance device,

[0016] g2. - Starting from the upright initial position, actuation of the actuator in a second (opposite) direction activates the footrest adjustment mechanism to extend the footrest and activates the seat-backrest adjustment mechanism to adjust the seat and the backrest to a reclined position, and

[0017] g3. - Starting from the reclined position, further actuation of the actuator in the second direction causes actuation of the tilting mechanism for tilting the seat and the backrest to a tilted position, the tilting mechanism causing the footrest to rise relative to the standing surface while the backrest lowers relative to the standing surface.

[0018] In an additional device in the tilted position, the seating furniture is further tilted backward from the reclined position, and this additional device is achieved by the base frame of the seating furniture being connected to the tilting mechanism.

[0019] The upright basic position of the seating furniture should be understood as the position where the seat is basically horizontally oriented, i.e., at an angle of 0° + / - 10° relative to the horizontal plane. The backrest is basically vertical or aligned at an angle of 0° + / - 10° with the vertical plane.

[0020] In the context of the present invention, the raised position should be understood as the position where at least the rear region of the seat is raised, thereby creating a slightly forward-tilted seat surface. The angle between the seat and the backrest remains substantially unchanged between the upright basic position and the raised position. In the raised position, the seat basically has an angle within the range of 25° + / - 20° relative to the horizontal plane.

[0021] The reclined position of the seating furniture is characterized on the one hand by the extended footrest and the backward-tilted backrest. The front region of the seat is preferably arranged slightly higher than the upright basic position. In the reclined position, the angle between the seat and the backrest surface increases particularly compared to the upright basic position. An angle between the seat and the backrest of 120° + / - 20° in the reclined position is considered particularly pleasant.

[0022] Compared with the reclined position, the main feature of the inclined position is that the distance between the footrest and the standing surface is greater, while the distance between the backrest and the standing surface is smaller. The inclined position promotes blood circulation and the decomposition of the accumulation of liquid in the lower extremities. Optionally, it can also be specified that in the inclined position, the distance between the footrest and the standing surface is approximately equal to or greater than the distance between the backrest and the standing surface to further enhance this effect.

[0023] A further improvement of the present invention is the subject matter of the dependent claims.

[0024] According to a preferred embodiment of the present invention, the inclined mechanism is further characterized in that when the seat and the backrest are inclined to the inclined position, the angle between the seat and the backrest remains unchanged. Therefore, the particularly comfortable angle between the seat and the backrest can be maintained in the reclined position. To make the angle between the seat and the backrest remain unchanged when the seat and the backrest are inclined to the inclined position, the seat-back adjustment mechanism may have a stop element that prevents further rotation of the backrest relative to the seat between the reclined position and the inclined position.

[0025] To achieve the inclined movement, the base frame of the seating furniture may have a first frame member and a second frame member that are hinged to each other about a transverse axis, and the inclined mechanism is designed for the relative adjustment of the first frame member and the second frame member about the transverse axis.

[0026] When the actuator is designed as a linear actuator, the possibility of adjusting the seating furniture is particularly simple. The first end of the linear actuator is connected to the base frame, and its second end is connected to the seat. The base frame may have a rotatably mounted shaft that extends transversely to the seating furniture, and the first end of the actuator is connected to the shaft to rotate the shaft.

[0027] According to another embodiment, when the actuator is actuated in the first direction, the shaft rotates to a first stop that prevents further rotation of the shaft, so that further actuation of the actuator in the first direction activates the standing assistance device to raise the seat and the backrest to the raised position. In addition, a second stop may be provided, which is connected to the seat or the seat-back adjustment mechanism. When the actuator is actuated in the second direction, the second stop prevents further rotation of the shaft when actively contacting the shaft, thereby triggering the adjustment of the seat and the backrest in the inclined position by further actuation.

[0028] The tilting mechanism has at least one lever linkage, one end of which is non-rotatably attached to the shaft, while the other end is hingedly coupled to a second frame member of the base frame. Starting from the reclined position, further actuation of the actuator in the second direction causes rotation of the shaft and the resulting relative adjustment of the first and second frame members about the transverse axis. The at least one lever linkage may have a first actuating lever and a second actuating lever. The first actuating lever is non-rotatably attached to the shaft at one end, the shaft being rotatably mounted on the first frame member, and the first actuating lever is hingedly coupled to the second actuating lever at its other end, which second actuating lever is in turn hingedly connected to the second frame member of the base frame.

[0029] According to another embodiment of the base frame, the first frame member may have two front support feet, two rear support feet, and two rear standing rollers. In the raised position, the upright base position, and the reclined position, the base frame is supported on the front support feet and the rear standing rollers of the first frame member L4. The second frame member has front standing rollers for use in the tilted position, in which the base frame is supported on the front standing rollers of the second frame member and the rear support feet of the first frame member located on the standing surface. The rear support feet ensure that the seating furniture is firmly fixed, while the front standing rollers roll on the standing surface during tilting, thus being able to shorten the distance between the front standing rollers of the second frame member and the rear support feet of the first frame member, thereby enabling the two frame members to be adjusted relative to each other.

[0030] In this embodiment, it is also conceivable that the base frame is supported at an intermediate position between the front standing rollers of the second frame member and the rear standing rollers of the first frame member, enabling the seating furniture to be easily moved. This intermediate position is a suitable position, which can be accessed individually via a remote controller or an operating button, and then the remote controller or the operating button can be used to adjust the seating furniture within the room.

[0031] According to an alternative embodiment of the base frame, the standing rollers on the first frame member can also be omitted, such that in the raised position, the upright base position, and the reclined position, the base frame is supported on the front and rear support feet of the first frame member, and in the tilted position, the base frame is on the front standing rollers of the second frame member and the rear support feet of the first frame member. Description of the Drawings

[0032] Exemplary embodiments of the present invention are described in more detail with reference to the following description and the drawings.

[0033] In the drawings:

[0034] Figure 1 is a schematic side view of the seating furniture in the upright base position,

[0035] Figure 2Is a schematic side view of a seat furniture in an elevated basic position (activated standing assistance device),

[0036] Figure 3 Is a schematic side view of a seat furniture in a position where the footrest is extended,

[0037] Figure 4 Is a schematic side view of a seat furniture in a reclined position,

[0038] Figure 5 Is a schematic side view of a seat furniture in an inclined position,

[0039] Figure 6 Is a three-dimensional detailed view of the front region of the base frame,

[0040] Figure 7a Is a side view of the swivel frame of the base frame during the adjustment of the seat and the backrest in the reclined position,

[0041] Figure 7b Is Figure 7a Three-dimensional view of,

[0042] Figure 8a Is a side view of the swivel frame of the base frame during the actuation of the standing assistance device,

[0043] Figure 8b Is Figure 8a Three-dimensional view of,

[0044] Figure 9 Is a three-dimensional representation of the rear part of the seat furniture. Detailed Description

[0045] Figure 1 Shows a seat furniture according to the invention in its upright basic position. Basically only the mechanical structure is shown, and in particular the padding and side support beams are omitted for better explanation of the invention. The seat furniture has a seat 1, a backrest 2 and a footrest 3. In addition, there is a base frame 4 for supporting the seat furniture on a standing surface 5.

[0046] By actuating the actuator 6 in a first (rotational) direction, the standing assistance device 7 is activated to raise the seat 1 and the backrest 2 from Figure 1 The upright basic position shown to Figure 2 The elevated position shown. If starting from the upright basic position according to Figure 1 , the actuator 6 is actuated in a second opposite (rotational) direction, then the footrest adjustment mechanism 8 is activated to extend the footrest 3 to Figure 3the position shown. The front end of the seat 1 may also be slightly raised. Further actuation of the actuator 6 in the second direction activates the seat adjustment mechanism 91 and the backrest adjustment mechanism 92, thereby adjusting the seat 1 and the backrest 2 to Figure 4 the reclined position shown.

[0047] From Figure 4 the reclined position shown, further actuation of the actuator 6 in the second direction causes actuation of the tilting mechanism 10, whereby the seat 1 and the backrest 2 are tilted to Figure 5 the tilted position shown. The tilting mechanism 10 raises the footrest 3 and lowers the headrest 21, which is integral with or separate from the backrest 2, relative to the standing surface 5.

[0048] The base frame 4 is described in more detail below with reference to Figure 4 、 5 and 6. The base frame 4 basically consists of a first frame member 41 and a second frame member 42 that are hinged to each other about a transverse axis 43. The base frame 4 also has a fastening flange 44 that is fixedly arranged in the central region of the first frame member 41 and projects upward from the standing surface 5.

[0049] In addition, the first frame member 41 is provided with two front support feet 45, two rear support feet 46, and two rear standing rollers 47. In the raised position, the upright base position, and the reclined position, the base frame 4 is supported on the front support feet 45 and the rear standing rollers 47 of the first frame member. On the other hand, the second frame member 42 only has a front standing roller 48, which is only used during the tilting process, so that in the tilted position according to Figure 5 the base frame is supported on the front standing roller 48 of the second frame member 42 and the rear support feet 46 of the first frame member 41 located on the standing area 5. Therefore, the rear standing rollers 47 of the first frame member 41 are fastened between the front support feet 45 and the rear support feet 46 located on the first frame member 41. The rear support feet 46 define the pivot point about which the seat furniture tilts backward during the tilting process. During the tilting process, the front standing roller 48 of the second frame member 42 rolls on the standing surface 5.

[0050] The base frame 4 also has a swivel frame 49, which is in Figures 7a to 8b49. The swivel frame 49 consists essentially of two lateral swivel levers 491, 492 which are parallel to one another and which are hinged at one end about a common hinge axis 497 on the mounting flange 44 of the first frame part 41. In the central region, the two swivel levers 491, 492 are connected to one another by a cross member 494. At the ends of the swivel levers 491, 492 opposite the hinge axis 497, an axis 493 which projects transversely to the pivot levers 491, 492 is rotatably hinged, on which axis 493 a coupling arm 495 is rotatably attached substantially in the middle.

[0051] In the embodiment shown, the actuator 6 is designed as a linear motor with a nut 62, which is linearly adjustable via a spindle 61. A coupling eye 63 is provided at the motor-side end of the actuator 6, via which the actuator 6 is articulatedly connected to the coupling arm 495 about a second articulation axis 498. The nut 62 is coupled to the seat 1 via a connecting element 11.

[0052] according to Figures 1 to 5 The various positions of the chair are achieved by moving the nut 62 along the main axis 61. In other words, each position of the seating device is defined by a characteristic distance between the coupling eye 63 or the second joint axis 498 and the nut 62. By actuating the actuator 6, the nut 62 can be moved along the main axis 61 to a respectively desired distance from the coupling eye 63, wherein the chair assumes the position assigned to this distance. When the actuator is rotated in a first direction of rotation, the distance between the coupling eye 63 and the nut 62 is shortened, while activation in the opposite second direction of rotation increases the distance.

[0053] In the upright basic position, the nut 62 is located in a central position on the spindle 61, wherein the distance a1 between the nut 62 and the coupling eyelet 63 is. If the actuator 6 is actuated in a first direction (the direction of rotation of the spindle 61), the nut 62 moves in the direction of the coupling eyelet 63, thereby shortening the distance between the coupling eyelet 63 and the nut 62. This in turn activates the standing aid, so that the seat 1 and the backrest 2 move to the position according to Figure 2 In this position, the distance between the nut 62 and the coupling eyelet 23 is only a0. During the actuation of the actuator 6, the nut 62 acts as a support through the connection with the seat 1 via the connecting element 11, so that at the arrow 499 ( Figure 7a ) direction acts on the coupling arm 495 in the area of ​​the coupling eyelet 63. After the coupling arm 495 is non-rotatably connected to the shaft 493, the tensile force causes the shaft 493 to rotate clockwise until the two first actuating levers 101 non-rotatably connected to the shaft 493 come into contact with the first stopper 500 and prevent the shaft 493 from rotating further ( Figure 7a and 7b )until.

[0054] According to Figure 2 the standing aid device 7 basically consists of two lifting rods 71 and a swivel frame 49. For this purpose, the two lifting rods 71 are also hinged at their lower ends to two lateral fastening flanges 44 of the base frame 4, so that the lifting rods 71 are pivotable about a third hinge axis 72. The upper end of each lifting rod 71 is hinged to a lateral coupling element 12 about a fourth hinge axis 73. The first coupling element 12 is laterally firmly connected to the seat 1 or the associated seat frame. After the swivel frame 49 is rotatable about a first hinge axis 497 and on the other hand connected to the actuator 6 by a coupling arm 495, a tensile force in the direction of arrow 499 causes the lever linkage 71 and the swivel frame 49 to pivot about the third hinge axis 72 or the first hinge axis 497 until the shortest distance a0 between the coupling hole 63 and the nut 62 according to Figure 2 is reached. Compared to the upright basic position according to Figure 1 , the seat 1 and the backrest 2 are in a raised position, in which the seat 1 and the backrest 2 also tilt forward equally to facilitate standing up or sitting down. If the actuator 6 is actuated in a second opposite direction starting from the raised position according to Figure 2 , the seating furniture first again assumes the upright basic position according to Figure 1 .

[0055] Starting from the upright basic position according to Figure 1 , further actuation of the motor 6 in the second direction results in a further displacement of the nut 62 in the sense that the distance between the nut 62 and the coupling hole 63 increases, which in turn first actuates the footrest adjustment mechanism 8 to extend the footrest 3. The footrest adjustment mechanism is designed, for example, in the form of a scissor mechanism. Implementing the footrest 3 by means of the footrest adjustment mechanism 8 is well known to those skilled in the art and ultimately based on the fact that the seat 1 moves at least backwards and the footrest adjustment mechanism 8 is connected to the seat 1 or a seat adjustment mechanism 91 that causes the footrest 3 to extend. When the footrest 3 extends, the angle between the seat 1 and the backrest 2 hardly changes or does not change at all.

[0056] The backrest 2 is connected to the seat and the seat adjustment mechanism 91 by a backrest adjustment mechanism 92. A spring element 921 is provided in the region of the backrest adjustment mechanism 92. When the actuator is activated from the upright basic position according to Figure 1 to the reclined position according to Figure 4 , the spring element 921 first only extends the footrest 3 and has not yet adjusted the backrest 2 relative to the seat 1. Only when the footrest 3 extends and the actuator 6 is further actuated, the backrest 2 is adjusted against the force of the spring element 921 because the angle between the seat 1 and the backrest 2 is increased by the backrest adjustment mechanism 92. In addition, the front region of the seat 1 can be raised.

[0057] Therefore, starting fromFigure 4 Starting from the reclined position, in the sense of increasing the distance between the nut 62 and the connection eye 63, further actuation of the actuator does not result in any further tilting of the backrest 2 relative to the seat 1. The backrest adjustment mechanism has a stop element 922( Figure 9 ), which prevents the backrest 2 from rotating further relative to the seat 1 between the reclined position according to Figure 4 and the tilted position according to Figure 5 . The stop element 922 now exerts a compressive force on the connecting arm 495 in the direction of the arrow 501 on the stop element 6, such that the shaft 493 rotates counterclockwise in Figure 8a .

[0058] This counterclockwise rotational movement triggers the tilting mechanism 10, which includes a first actuating lever 101 and a second actuating lever 102, and the first actuating lever 101 and the second actuating lever 102 are each located on both sides of the seat furniture. The two first actuating levers 101 are each non-rotatably connected at one end to the shaft 493 of the swivel frame 49. The other end of the first actuating lever 101 is hingedly connected to the second actuating lever 102, and the second actuating lever 102 is in turn hingedly connected at its other end to the second frame member 42, specifically at the end of the second frame member 42 remote from the front standing roller 48. Then, the counterclockwise rotation of the shaft 493 causes the first frame member 41 to be relatively adjusted with respect to the second frame member 42 about the transverse axis 43, and the two frame members 41, 42 form an X shape( Figure 5 ). The first frame member 41 is supported on the rear support feet 46 on the standing surface 5 and forms the tilting axis about which the seat furniture tilts. During the tilting process, the front standing roller 48 of the second frame member rolls on the standing surface 5, which means that the distance between the rear (stationary) support feet 46 and the front standing roller 48 is shortened. Starting from the reclined position according to Figure 4 , during the tilting process, the footrest 3, the seat 1 and the backrest 2 tilt backward as a unit, such that the footrest 3 is raised relative to the standing surface 5, while the headrest 21 is lowered relative to the standing surface 5.

[0059] If the motor is reversed in its rotational direction, starting from the tilted position according to Figure 5 , first the reclined position according to Figure 4 is reached, then the footrest 3 is retracted and the upright basic position is reached again.

[0060] If the seat furniture is adjusted without a load being applied, the spring element 921 can cause the shaft 493 to rotate in the direction of the arrow 501 before the backrest 2 tilts relative to the seat 1. To prevent the actuator 6 from rotating the shaft 493 beyond the maximum rotational position and damaging the motor, a second stop 13 can be provided on the seat 1 or the seat adjustment mechanism 91 or at another suitable point(Figure 6 ), the second stop 13 prevents rotation of the shaft 493 until the seating furniture reaches Figure 4 the reclined position shown.

Claims

1. The seating furniture comprises: a. a seat (1), b. a backrest (2) having an integral or separate headrest, c. a seat-back adjustment mechanism (91, 92) for adjusting the seat and the backrest from an upright initial position to a reclined position, wherein in the reclined position, the angle between the seat (1) and the backrest (2) increases compared to the upright initial position, d. a footrest (3) having a footrest adjustment mechanism (8) for extending and retracting the footrest (3), e. a base frame (4) for supporting the seating furniture on a standing surface (5), wherein the base frame (4) comprises a tilting mechanism (10) for tilting the seating furniture from the reclined position to a tilted position, wherein the angle between the seat (1) and the backrest (2) is the same in the reclined position as in the tilted position, f. a standing assistance device (7) for raising the seat (1) and the backrest (2) from the upright initial position to a raised position, g. an actuator (6) for actuating the seat-back adjustment mechanism (91, 92), the footrest adjustment mechanism, the tilting mechanism (10) and the standing assistance device (7), wherein g1. - starting from the upright initial position, actuation of the actuator (6) in a first direction activates the standing assistance device (7), g2. - starting from the upright initial position, actuation of the actuator (6) in an opposite second direction activates the footrest adjustment mechanism (8) to extend the footrest and activates the seat-back adjustment mechanism (91, 92) to adjust the seat (1) and the backrest (2) to the reclined position, and g3. - starting from the reclined position, further actuation of the actuator (6) in the second direction causes actuation of the tilting mechanism (10) for tilting the seat (1) and the backrest (2) to a tilted position, the tilting mechanism (10) causing the footrest (3) to rise relative to the standing surface (5) while the backrest (2) drops relative to the standing surface (5), wherein the base frame (4) has a first frame member (41) and a second frame member (42) which are hingedly connected to each other about a transverse axis (43), and the tilting mechanism (10) is designed to relatively adjust the first frame member (41) and the second frame member (42) about the transverse axis (43), and The seat-back adjustment mechanism (91, 92) has a stop element (922) which prevents further rotation of the backrest (2) relative to the seat (1) between the reclined position and the tilted position, such that the angle between the seat (1) and the backrest (2) is the same in the reclined position as in the tilted position.

2. The seating furniture according to claim 1, characterized in that, The actuator (6) is designed as a linear actuator which is coupled at its first end to the base frame and at its second end to the seat (1).

3. The seat furniture according to claim 1, characterized in that, The base frame (4) has a rotatably mounted shaft (493) which projects laterally out of the seating furniture, and the actuator (6) is coupled at its first end to the shaft (493) to rotate the shaft (493).

4. The seating furniture according to claim 3, characterized in that, When the actuator (6) is actuated in the first direction, the shaft (493) rotates to a first stop (500) which prevents further rotation of the shaft (493), such that further actuation of the actuator (6) in the first direction activates the standing aid (7) to raise the seat (1) and the backrest (2) to the raised position.

5. The seating furniture according to claim 4, characterized in that, A second stop (13) is provided which is connected to the seat (1) or the seat-back adjustment mechanism (91, 92), and which prevents further rotation of the shaft (493) when the actuator (6) is actuated in the second direction and the second stop (13) actively contacts the shaft (493).

6. The seating furniture according to claim 3, characterized in that, The tilting mechanism (10) has at least one lever linkage, one end of which is non-rotatably attached to the shaft (493) and the other end of which is hingedly coupled to the second frame part (42) of the base frame (4). Starting from the reclined position, further actuation of the actuator (6) in the second direction causes rotation of the shaft (493) and the resulting relative adjustment of the first frame part (41) and the second frame part (42) about the transverse axis (43).

7. The seating furniture according to claim 6, characterized in that, The at least one lever linkage has a first actuating lever (101) and a second actuating lever (102). The first actuating lever (101) is non-rotatably attached at one end to the shaft (493), which is rotatably mounted in the first frame part (41), and the first actuating lever (101) is hingedly coupled at its other end to the second actuating lever (102), which in turn is hingedly connected to the second frame part (42) of the base frame (4).

8. The seating furniture according to claim 1, characterized in that, The first frame member (41) has two front support feet (45), two rear support feet (46) and two rear support rollers (47). In the raised position and the reclined position, the base frame (4) is supported on the front support feet and the rear support rollers (47) of the first frame member (41), while the second frame member (42) has two front support rollers (48). In the reclined position, the base frame (4) is supported on the front support rollers (48) of the second frame member (42) and the rear support feet (46) of the first frame member (41) located on the standing surface (5).

Images