DE102008024745A1 - Stand-up wheelchair, has backrest connected to seat in articulated manner, where angle between backrest and seat is changed to another angle during change of tilt angle of seat from horizontal line - Google Patents

Abstract

The wheelchair has a stand-up frame fastened to a guiding post (5) and a guiding frame (20) of an undercarriage. A seat (10) is pivotally fastened to the guiding post and the guiding frame and displaceable from a sitting position into a standing position by an actuator. A backrest is connected to the seat in an articulated manner at an angle, and has an articulated parallelogram pivotally arranged beneath the seat, where a tilt angle of the seat is varied. An angle between the backrest and seat is changed to another angle during the change of the tilt angle of the seat from a horizontal line.

Description

The The invention relates to a Aufrichtrollstuhl with a chassis and a erecting frame attached to the front part of the chassis, with a pivotally mounted on the front part of the chassis Seat is connected, via an actuator from a sitting position can be brought into a standing position, one hingedly connected to the seat Backrest with a backrest cushion, and with at least one below the seat swiveling at the front Part of the chassis arranged articulated parallelogram.

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

The above a long-term sedentary posture a wheelchair user leads to the physical degradation of bodily functions, such as reduced mobility of the lower limbs, Slowing intestinal activity and worsening the blood circulation. By sitting exists as well the risk of pressure ulcers. A sit-up wheelchair helps with these consequences to reduce, as by changing the posture, to standing, the degradation of body functions reduced becomes. The swiveling seat is equipped with backrest and footrest mounted on a chassis. The correct one Adaptation to the anatomical requirements of the user is a very important criterion for the comfort that the wheelchair offers.

Standing wheelchairs also offer the user the opportunity to be sporty to press. For example, the disabled person can play golf play. In such a case it is particularly important that the Wheelchair in the erect position a high stability offers. For example, a requirement is that the footrest gets up in the erect position on the ground or supported on it. The backrest must be parallel standing to the seat and the golfer must have enough exercise (Turning of the upper body) are commanded to strike to be able to swing.

At the Change from the sitting position to the standing position (and vice versa) retains the backrest by means of a mechanism their vertical position. If the axis of rotation of the backrest and the (bony) axis of the hip joint of the User coincide, a shearing motion between the body the user and the backrest (shirt-pull-out effect) avoided. The axes of rotation usually do not coincide. To avoid the shearing motion is in the known wheelchair the backrest cushion relative to the backrest slidable and so connected to the seat that it is accordingly the angle of inclination of the seat is shifted in the vertical direction.

The vertical position of the backrest is when straightening and Lowering desired, so that the upper body of the Wheelchair-using people also in the vertical position remains. However, if the seat is tilted negatively, so the rear part of the seat opposite to the lowered front part, which is referred to as Kantelung, wherein the Users would like to take a more comfortable or safe sitting position, so reduces the angle in the known Gelenkparallelogramm between seat and backrest. In this Operation, the user is squeezed and suffers physical discomfort such as shortness of breath, nausea, etc.

From This problem is based on the initially described Upgrading wheelchair can be improved.

To solve the problem, a generic wheelchair characterized by the fact that the inclination angle of the seat is variable and is changed in a change in the angle of inclination of the seat from the horizontal angle α ₁ between the backrest and the seat in an angle α ₂ .

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 Setting the inclination angle of the seat is preferably the front part of the chassis formed telescopic. Especially It is advantageous if the frame of the chassis at this Site is designed as a telescopic tube.

Of the Front hinge point is preferably pivotable about a attached lever connected to the chassis and in a sliding guide mounted on the displaceable component of the front part.

The Displacement of the front pivot point in the direction of travel takes place preferably in that the sliding guide opposite the telescoping direction is inclined at an angle.

A Easy sliding is achievable when passing through a provided with a slot sheet is formed.

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

Of the Inclination angle β of the backrest may preferably be adjusted by the sliding guide displaced is. The displacement can be achieved by the Attachment point of the sliding guide on the telescopic Component is changeable in the direction of travel.

If a guided around a pulley webbing with its one End of the seat-carrying handlebar and with its other end with the backrest movable relative to the backrest is attached, the webbing can the back pad on the Pull up the backrest when seated from the standing position is brought into the sitting position, so that no relative movement between the back pad and the back of the User arises.

Of the The way the backrest is pulled up is preferably adjustable. For adjustment, an adjustment plate be provided, whose length relative to the immediately below the lever arranged in the seat is adjustable.

Preferably are two parallel parallels arranged side by side provided that accommodate the seat.

With Help a drawing is an embodiment of the Invention will be described in more detail below.

It shows:

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

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

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

4 the structurally executed representation after 1 ;

5 the structurally executed representation after 2 ;

6 the structurally executed representation after 3 ;

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

8th the view according to arrow VIII after 7 ;

9 the side view of the wheelchair in standing position;

10 the view according to arrow X after 9 ,

The wheelchair consists of the chassis 40 with the erecting rack mounted thereon 41 , the drive wheels 42 and the two steerable front wheels 43 , The erecting rack 41 has a seat 10 , a backrest 24 and a footrest 36 on. About an actuator 6 can the erecting rack 41 be pivoted, the seat of the Aufrichtgestells 41 gets into a vertical position. The backrest 24 maintains its vertical position and then stands parallel to the seat 10 (please refer 6 ). Simultaneously with the erection of the seat 10 becomes the footrest 36 lowered (see 9 ). The front part of the erecting rack 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 sliding and infinitely adjustable.

The seat 10 is around the pivot point 11 swiveling with the guide column 5 connected. Below the seat 10 is one or are preferably two parallel to each other, from the levers 1 . 2 and 3 existing joint parallelograms 45 arranged, each is with the hinge point 14 over his pivot point 16 and the pivotally arranged lever 22 with the guide frame 20 connected. At the same time, the pivot point becomes 14 about that with the at the guide column 5 to be fastened, preferably screwed, guide plate 7 guided. The rear end of the seat 10 and the backrest 24 are above the pivot points 12 and 13 connected with each other.

On the underside of the seat 10 is a seated sheet 31 provided that on the lever 1 rests. The seat plate 31 has a mounting plate 4 for the actuator 6 and a mounting plate 83 for the adjusting plate 65 on. At the on the seat panel 31 located mounting plate 4 is one end of the actuator 6 attached, the other end is on the guide frame 20 attached bearing plate 9 hinged. Will the actuator 6 telescoped, the in 7 shown sitting position in the in 9 transferred standing position shown. It is by means of Gelenkparallelogrammes 45 the backrest 24 on the backrest cushion 17 attached, tracked. This is the actuator 6 around the axis of rotation 30 on the mounting plate 4 and the rotation axis 29 on the bearing plate 9 pivoted.

Below is the operation of Gelenkparallelogramme 45 only be explained on the basis of a Gelenkparallelogrammes, since both Gelenkparallelogramme 45 are constructed identically.

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

The lever belonging to the backrest 3 of the articulated parallelogram 45 forms the joint points 11 and 12 , The backrest 24 pivots around the pivot point 12 ,

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

The backrest 24 consists of the back carrier 66 with the pulley 81 and the back plate 67 with the backrest cushion 17 , The back plate 67 will be in the back carrier 66 sliding and stepless adjustable stored. The webbing 68 is at one end with the one attachment axis 82 having adjusting plate 65 at the top lever 1 is attached, and over the pulley 81 at the other end with the back plate 67 connected.

As a result of the change in distance Y ₁ -Y _{2 of} the attachment axis 82 and the pulley 81 slides when erecting the seat 10 the back plate 67 downward. At the same time the distance Z between the back plate 67 with the backrest cushion 17 and the seat of the seat 10 shortened (see distance Z ₁ in 4 and Z ₂ in 6 ). There is an anatomical back compensation, which is a shearing motion between the backrest pad 17 and excludes the user's back.

The position of the attachment axis 82 is over each other corresponding holes in the adjusting plate 65 and at the lever 1b fixed mounting plate 83 variable. The change in position of the attachment axis 82 relative to the hinge point 12 has direct influence on the back compensation. Thus, the back compensation can be adjusted individually to the user.

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

The change in 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.

To further relief in the seat position the angle of inclination of the backrest can β ₁ 24 by displacing the guide plate 7 within the corresponding holes in the guide column 5 to be changed. The inclination angle β ₂ in the standing position becomes by displacing the guide plate 7 unaffected.

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 back unclad

α ₂

angle between the seat and backrest

β ₁

tilt angle the backrest in sitting position

β ₂

tilt angle the backrest in standing position

γ

seat angle

δ

angle 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

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 0815822 B1 [0002]

Claims (15)

Raising wheelchair with a chassis ( 40 ) and one at the front of the chassis ( 40 ) mounted erecting rack ( 41 ), with the one at the front ( 5 . 20 ) of the chassis ( 40 ) pivotally mounted seat ( 10 ) connected via an actuator ( 6 ) is brought from a sitting position to a standing position, a hinged to the seat ( 10 ), at an angle α to this standing backrest ( 24 ) with a back pad ( 17 ), and at least one below the seat ( 10 ) pivotable on the front part ( 5 . 20 ) of the chassis ( 40 ) arranged articulated parallelogram ( 45 ), characterized in that the angle of inclination (γ) of the seat ( 10 ) is variable and with a change in the inclination angle (γ) of the seat ( 10 ) from the horizontal (H) out the angle (α ₁ ) between the backrest ( 24 ) and the seat ( 10 ) is changed to an angle (α ₂ ). Raising wheelchair according to claim 1, characterized that the size of the change of angle the size of the change in the angle of inclination (γ) depends. Raising wheelchair according to claim 1 or 2, characterized in that the angle (α ₂ ) is greater than the angle (α ₁ ). Raising wheelchair according to one of claims 1 to 3, characterized in that the change of the angle by a displacement of a front pivot point ( 14 ) of the articulated parallelogram ( 45 ) in the direction of travel (F). Raising wheelchair according to claim 4, characterized in that for adjusting the angle of inclination (γ) of the front part ( 5 . 20 ) of the chassis ( 40 ) is telescopic. Raising wheelchair according to claim 5, characterized in that the front pivot point ( 14 ) via a pivotally mounted lever ( 22 ) with the chassis ( 40 ) and in a sliding guide ( 7 ) on the displaceable component ( 5 ) of the front part is mounted. Raising wheelchair according to claim 6, characterized in that the sliding guide ( 7 ) is inclined relative to the telescoping direction (T) at an angle (δ). Raising wheelchair according to claim 6 or 7, characterized in that the sliding guide ( 7 ) with a slot ( 8th ) provided sheet metal is. Raising wheelchair according to claim 8, characterized in that the sheet ( 7 ) with the component ( 5 ) is screwed. Raising wheelchair according to claim 7, 8 or 9, characterized characterized in that the angle (δ) with which the sliding guide inclined, is adjustable. Raising wheelchair according to claim 10, characterized in that the angle of inclination (β) of the backrest ( 24 ) by sliding the sliding guide ( 7 ) is adjustable. Raising wheelchair according to claim 11, characterized in that the attachment point of the sliding guide ( 7 ) on the component ( 5 ) in the direction of travel (F) is changeable. Erecting wheelchair according to claim 1, characterized in that one around a deflection roller ( 81 ) guided webbing ( 68 ) with its one end to the seat ( 10 ) nearest handlebar ( 1 ) of the articulated parallelogram ( 45 ) and with its other end relative to the backrest ( 24 ) movable back cushions ( 17 ) and the webbing ( 68 ) the back cushion ( 17 ) on the backrest ( 24 ) pulls upwards when the seat ( 10 ) is brought from the standing position to the sitting position. Raising wheelchair according to claim 13, characterized in that the path to which the backrest ( 24 ) is pulled upwards, is adjustable. Raising wheelchair according to claim 14, characterized in that for adjusting an adjusting plate ( 65 ) is provided whose length relative to the lever ( 1 ) is adjustable.