EP2190396B1 - Stand-up wheelchair - Google Patents

Abstract

A stand-up wheelchair, comprising an undercarriage (40) and a stand-up frame (41) that is fastened to the front part of the undercarriage (40), a seat (10) that is pivotally fastened to the front part (5, 20) of the undercarriage (40) being connected to said stand-up frame, the seat being displaceable from a sitting position into a standing position by way of an actuator (6), further comprising a backrest (24) that is connected to the seat (10) in an articulated manner, disposed at an angle (α) thereto and has a back cushion (17), and comprising at least one articulated parallelogram (45) pivotally arranged beneath the seat (10) on the front part (5, 20) of the undercarriage (40), characterized in that the angle of inclination (γ) of the seat (10) can be varied, and during a change of the angle of inclination (γ) of the seat (10) out of the horizontal line (H) the angle (αi) between the backrest (24) and the seat (10) is changed at an angle (α2).

Description

The invention relates to a Aufrichtrollstuhl with a chassis and attached to the front of the chassis Aufrichtgestell, with a pivotally attached to the front part of the chassis seat is connected, which can be brought via an actuator from a sitting position to a standing position, a hinged to the seat associated backrest with a backrest cushion, and with at least one below the seat pivotally mounted on the front part of the chassis arranged Gelenkparallelogramm with two front and two rear pivot points.

Such Aufrichtrollstuhl is for example from the EP 0 815 822 B1 known.

The long-term sitting posture of a wheelchair user leads to the physical degradation of bodily functions, such as reduced mobility of the lower limbs, slowing of bowel activities, and worsening of blood circulation. Sitting also causes the risk of decubitus. A sit-up wheelchair helps to reduce these consequences, as changing the posture to the point of standing reduces the degradation of bodily functions. The swivel seat is mounted on a chassis with backrest and footrest. The correct adaptation to the anatomical requirements of the user is a very important criterion for the comfort offered by the wheelchair.

Raising wheelchairs also offer the user the opportunity to exercise. For example, the disabled person can play golf. In such a case it is especially important that the wheelchair is in the upright position Position provides high stability. For example, a requirement is that the footrest stand up in the raised position on the ground or be supported on it. The backrest must be parallel to the seat and the golfer must be provided with sufficient movement (turning of the upper body) to be able to swing to the beat.

When changing from the sitting position to the standing position (and vice versa), the backrest maintains its vertical position by means of a mechanism. When the axis of rotation of the backrest and the (bony) axis of the user's hip joint coincide, a shearing motion between the user's body and the backrest (shirt pull-out effect) is avoided. The axes of rotation usually do not coincide. In order to avoid the shearing movement, in the known wheelchair, the backrest cushion is displaceable relative to the backrest and connected to the seat so that it is displaced in the vertical direction in accordance with the angular inclination of the seat.

The vertical position of the backrest is desired when raising and lowering, so that the upper body of the person using the wheelchair also remains in the vertical position. However, if the seat surface is inclined negatively, ie the rear part of the seat surface is lowered relative to the front part, which is called tilting, whereby the user wishes to assume a more comfortable or safe sitting position, then the angle between seat surface and backrest decreases in the known articulated parallelogram. In this process, the user is squeezed and suffers physical discomfort such as shortness of breath, nausea, etc ..

The EP 1 488 770 A1 discloses a righting wheelchair in which the inclination of the backrest relative to the vertical is adjustable.

Based on this problem, the erecting wheelchair described at the outset should be improved.

To solve the problem, a generic wheelchair is characterized in that the vertical distance of the front pivot points for adjusting the angle of inclination of the seat for tilting is changeable and in a change in the inclination angle of the seat from the horizontal angle α ₁ between the backrest and the seat in a Angle α _{2 is} changed.

The amount of change of the angle preferably depends on the magnitude of the change in the inclination angle. As a result, the free area between the seat and backrest changes automatically when the seat tilts, so that it is impossible that the user is squeezed because the angle α _{2 is} greater than the angle α ₁ .

The change of the angle is preferably carried out by a displacement of a front pivot point of the articulated parallelogram in the direction of travel.

To adjust the angle of inclination of the seat, the front part of the chassis is preferably designed to be telescopic. It is particularly advantageous if the frame of the chassis is formed at this point as a telescopic tube.

The front pivot point is preferably connected via a pivotally mounted lever to the chassis and mounted in a sliding guide on the displaceable member of the front part.

The displacement of the front pivot point in the direction of travel is preferably carried out in that the sliding guide is inclined relative to the Teleskopierrichtung at an angle.

A simple sliding guide is achievable if it is formed by a plate provided with a slot.

The sheet metal can be screwed to the component. If the angle at which the sliding guide is inclined is adjustable, the size of the adjusting angle α _{2 can be} varied.

The inclination angle β of the backrest can preferably be adjusted by the sliding guide being displaceable. The displaceability can be achieved in that the attachment point of the sliding guide on the telescopic component is changeable in the direction of travel.

When a webbing guided around a pulley is fastened with its one end to the seat-carrying handlebar and with its other end to the backrest displaceable relative to the backrest, the webbing can pull up the back pad on the backrest when the seat is in the standing position is brought into the sitting position, so that no relative movement between the back cushion and the back of the user arises.

The way by which the backrest is pulled upwards is preferably adjustable. For adjustment, an adjusting plate may be provided, the length of which is adjustable relative to the lever arranged directly under the seat.

Preferably, two parallel juxtaposed Gelenkparallelogramme are provided which receive the seat.

With the aid of a drawing, an embodiment of the invention will be described in more detail below.

Figur 1

die schematische Darstellung der Sitzkonstruktion in der ungekantelten Sitzposition;

Figur 2

die schematische Darstellung der Sitzkonstruktion in der gekantelten Sitzposition;

Figur 3

die schematische Darstellung der Sitzkonstruktion in der aufgerichteten Position;

Figur 4

die konstruktiv ausgeführte Darstellung nach Figur 1;

Figur 5

die konstruktiv ausgeführte Darstellung nach Figur 2;

Figur 6

die konstruktiv ausgeführte Darstellung nach Figur 3;

Figur 7

die Seitenansicht des erfindungsgemäßen Rollstuhles in Sitzposition;

Figur 8

die Ansicht gemäß Sichtpfeil VIII nach Figur 7;

Figur 9

die Seitenansicht des Rollstuhles in Stehposition;

Figur 10

die Ansicht gemäß Sichtpfeil X nach Figur 9.

It shows:

FIG. 1

the schematic representation of the seat structure in the uncanted seating position;

FIG. 2

the schematic representation of the seat structure in the tilted seating position;

FIG. 3

the schematic representation of the seat structure in the erected position;

FIG. 4

the structurally executed representation after FIG. 1 ;

FIG. 5

the structurally executed representation after FIG. 2 ;

FIG. 6

the structurally executed representation after FIG. 3 ;

FIG. 7

the side view of the wheelchair according to the invention in the sitting position;

FIG. 8

the view according to arrow VIII after FIG. 7 ;

FIG. 9

the side view of the wheelchair in standing position;

FIG. 10

the view according to arrow X after FIG. 9 ,

The wheelchair consists of the chassis 40 with the erecting frame 41 mounted thereon, the drive wheels 42 and the two steerable front wheels 43. The erecting frame 41 has a seat 10, a backrest 24 and a footrest 36 on. Via an actuator 6, the erecting frame 41 can be pivoted, the seat of the Aufrichtgestells 41 passes to a vertical position. The backrest 24 maintains its vertical position and then stands parallel to the seat 10 (see FIG. 6 ). Simultaneously with the erection of the seat 10, the footrest 36 is lowered (see FIG. 9 ). The front part of the erecting frame 41 also forms the front part of the chassis 40.

The front part of the chassis 40 is formed by a guide frame 20, in which the guide column 5 is mounted slidably and continuously adjustable.

The seat 10 is pivotally connected to the guide pillar 5 about the hinge point 11. Below the seat 10 is one or preferably two arranged parallel to each other, consisting of the levers 1, 2 and 3 Gelenkparallelogramme 45, each is connected to the hinge point 14 via its pivot point 16 and the pivotally mounted lever 22 to the guide frame 20. At the same time, the pivot point 14 is guided over the guide plate 7 to be fastened to the guide column 5, preferably screwed. The rear end of the seat 10 and the backrest 24 are connected to each other via the hinge points 12 and 13.

On the underside of the seat 10, a seat plate 31 is provided which rests on the lever 1. The seat plate 31 has a mounting plate 4 for the actuator 6 and a mounting plate 83 for the adjusting plate 65. At the located on the seat plate 31 mounting plate 4, one end of the actuator 6 is fixed, the other end is hinged to the guide frame 20 fixed to the bearing plate 9. When the actuator 6 is telescoped, the in FIG. 7 shown sitting position in the in FIG. 9 transferred standing position shown. In this case, by means of the Gelenkparallelogrammes 45, the backrest 24 to which the backrest cushion 17 is attached, tracked. This is the actuator 6 pivotally mounted about the axis of rotation 30 on the mounting plate 4 and the axis of rotation 29 on the bearing plate 9.

Below, the mode of operation of the articulated parallelograms 45 will only be explained on the basis of a jointed parallelogram, since both articulated parallelograms 45 are constructed identically.

The upper lever 1, the lower lever 2 and the seat plate 31 are divided into two parts. The parts 1 a, 1 b, 2 a, 2 b and 31 a and 31 b are provided with mutually corresponding holes through which the levers 1 a, 1 b and 2 a, 2 b and the seat panel parts 31 a, 31 b can be screwed in their length adjustable. The distance of the hinge points 11-12 and 13-14 is thus adjustable.

The belonging to the backrest lever 3 of the Gelenkparallelogrammes 45 forms the hinge points 12 and 13. The backrest 24 pivots about the pivot point 12th

From the in FIGS. 7 and 8 seating position generally starts erecting. By extending the actuator 6, the distance between the hinge points 29 and 30, so that the seat 10 pivots about the axis of rotation 11. The hinge points 11 and 14 remain in position. The articulated parallelogram 45 moves together with the seat 10. About the lower lever 2 with the hinge points 13 and 14, the vertical orientation of the backrest 24 is maintained. It is said that the lever 2 upright the backrest 24. With the help of the upper lever 1, the backrest 24 is positioned with the hinge point 12.

The backrest 24 consists of the back support 66 with the deflection roller 81 and the back plate 67 with the backrest cushion 17. The back plate 67 is mounted in the back support 66 slidably and continuously adjustable. The webbing 68 is at its one end with the one attachment axis 82 having adjusting plate 65 which is fixed to the upper lever 1, and connected via the guide roller 81 at the other end with the back plate 67.

As a result of the change in distance Y ₁ -Y _{2 of} the mounting axis 82 and the guide roller 81 slides when erecting the seat 10, the back plate 67 down. At the same time the distance Z between the back plate 67 with the backrest cushion 17 and the seat surface of the seat 10 is shortened (see distance Z ₁ in FIG. 4 and Z ₂ in FIG. 6 ). There is an anatomical back compensation, which excludes a shearing movement between the backrest cushion 17 and the back of the user.

The position of the attachment axis 82 can be changed via mutually corresponding bores in the adjustment plate 65 and in the attachment plate 83 fastened to the lever 1b. The change in position of the attachment axis 82 relative to the hinge point 12 has a direct influence on the back compensation. Thus, the back compensation can be adjusted individually to the user.

In order to change the angle of inclination γ of the seat surface when cornering, the vertical distance between the hinge points 11 and 14 must be changed. For this purpose, the guide column 5 is telescoped to the guide frame 20 stepless. If the distance X _{1 is increased} by pulling the guide column 5 out of the guide frame 20 (change from X ₁ to X ₂ ), the seat tilts around the pivot point 30 in a pivoting manner towards the rear (cf. FIG. 5 ). At the same time, the distance of the hinge point 14 relative to the hinge point 11 changes. In this case, the pivot point 14 located on the pivotally mounted lever 22 slides in the groove or slot 8 in the guide plate 7, which forms a sliding guide, in the direction of travel F, because of the pivot point 16 is connected to the guide frame 20. At the same time, the angle between the backrest 24 and the seat 10 also changes from α _{1 to} α ₂ .

The change of the angle α is dependent on the inclination angle γ and the change in distance of X ₁ - X ₂ . The increasing angle α leads to a better pressure relief for the upper body of the user and thus to a reduction of pressure ulcer.

For further relief, the angle of inclination β _{1 of} the backrest 24 can be changed by displacing the guide plate 7 within the corresponding holes in the guide column 5 in the sitting position. The inclination angle β ₂ in the standing position is not affected by the displacement of the guide plate 7.

LIST OF REFERENCE NUMBERS

1

lever

1a

lever member

1b

lever member

2

lever

2a

lever member

2 B

lever member

3

lever

4

mounting plate

5

guide column

6

actuator

7

guide plate

8th

Groove / slot

9

bearing plate

10

Seat

11

fulcrum

12

fulcrum

13

fulcrum

14

fulcrum

16

fulcrum

17

Backrest cushion

20

guide frame

22

lever

24

backrest

30

axis of rotation

31

seat plate

31a

Seat sheet metal part

31b

Seat sheet metal part

40

chassis

41

uplift

42

drive wheel

43

steering wheel

45

articulated

65

Verstellblech

67

back panel

68

webbing

81

idler pulley

82

mounting axis

83

mounting plate

α ₁

Angle between seat and backrest without bracing

α ₂

Angled corner between seat and backrest

β ₁

Inclination angle of the backrest in sitting position

β ₂

Inclination angle of the backrest in standing position

γ

seat angle

δ

Angle of the sliding guide of the seat / guide plate

H

horizontal

T

Telescoping direction

X ₁

distance

X ₂

distance

Y ₁

distance

Y ₂

distance

Z ₁

distance

Z ₂

distance

Claims (15)

1. Stand-up wheelchair with a chassis (40) and a stand-up frame (41) which is fastened to the front part of the chassis (40) and to which a seat (10) is connected, said seat being fastened pivotably to the front part (5, 20) of the chassis (40) and being able to be brought from a sitting position into a standing position via an actuator (6), a backrest (24) which is connected in an articulated manner to the seat (10), is at an angle (α₁) to said seat and has a back cushion (17), and with at least one hinged parallelogram (45) which is arranged pivotably on the front part (5, 20) of the chassis (40) below the seat (10) and has two front hinge points (11, 14) and two rear hinge points (12, 13), characterized in that the vertical distance between the front hinge points (11, 14) is changeable in order to adjust the angle of inclination (γ) of the seat (10) for the purpose of tilting and, when the angle of inclination (γ) of the seat (10) is changed from the horizontal (H), the angle (α₁) between the backrest (24) and the seat (10) is changed into an angle (α₂).
2. Stand-up wheelchair according to Claim 1, characterized in that the size of the change in the angle (α₁) depends on the size of the change in the angle of inclination (γ).
3. Stand-up wheelchair according to Claim 1 or 2, characterized in that the angle (α₂) is larger than the angle (α₁).
4. Stand-up wheelchair according to one of Claims 1 to 3, characterized in that the angle (α₁) is changed by shifting the one front hinge point (14) of the hinged parallelogram (45) in the direction of travel (F).
5. Stand-up wheelchair according to Claim 4, characterized in that, in order to adjust the angle of inclination (γ), the front part (5, 20) of the chassis (40) can be telescoped.
6. Stand-up wheelchair according to Claim 5, characterized in that the front hinge point (14) is connected to the chassis (40) via a pivotably fastened lever (22) and is mounted in a sliding guide (7) on the displaceable component (5) of the front part.
7. Stand-up wheelchair according to Claim 6, characterized in that the sliding guide (7) in inclined at an angle (δ) in relation to the telescoping direction (T).
8. Stand-up wheelchair according to Claim 6 or 7, characterized in that the sliding guide (7) is a plate provided with a slot (8).
9. Stand-up wheelchair according to Claim 8, characterized in that the plate (7) is screwed to the component (5).
10. Stand-up wheelchair according to Claims 7, 8 or 9, characterized in that the angle (α) by which the sliding guide is inclined is adjustable.
11. Stand-up wheelchair according to Claim 10, characterized in that the angle of inclination (β) of the backrest (24) is adjustable by displacement of the sliding guide (7).
12. Stand-up wheelchair according to Claim 11, characterized in that the fastening point of the sliding guide (7) on the component (5) is changeable in the direction of travel (F).
13. Stand-up wheelchair according to Claim 1, characterized in that a belt strap (68) which is guided around a deflecting pulley (81) is fastened at one end to that lever (1) of the hinged parallelogram (45) which is closest to the seat (10) and at its other end to the back cushion (17), which is displaceable relative to the backrest (24), and the belt strap (68) pulls the back cushion (17) upwards on the backrest (24) when the seat (10) is brought from the standing position into the sitting position.
14. Stand-up wheelchair according to Claim 13, characterized in that the distance by which the backrest (24) is pulled upwards is adjustable.
15. Stand-up wheelchair according to Claim 14, characterized in that an adjustment plate (65), the length of which is adjustable relative to the lever (1), is provided for the adjustment.

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