DE202014006942U1 - Seat adjustment device for stepless height tilt adjustment of a seat frame of a wheelchair - Google Patents

Abstract

Seat adjustment device for continuously adjusting the height and inclination of a seat frame (8), in particular for a wheelchair, with a vertically arranged height adjustment drive (2) and an inclination drive (4), characterized in that the height adjustment drive (2) is arranged on a base frame (1) and a vertically adjustable seat mounting frame (3) is mounted on its upper end region and the seat frame (8) is mounted on the seat mounting frame (3) so that it can pivot about an axis of rotation (9), the tilt drive (4) being mounted horizontally on the seat mounting frame (3) is, whose end area is connected to an end area of the seat frame (8) by means of a four-joint mechanism (3, 6, 7, 8).

Description

The invention relates to a Sitzverstellvorrichtung according to the preamble of claim 1.

In detail, the invention relates to a seat adjustment device for stepless height and tilt adjustment of a seat frame, in particular for a wheelchair.

In particular, electric wheelchairs, it is known to form the seat height adjustable. Furthermore, it is desirable to provide a seat angle adjustment in addition to the seat height adjustment in order to jack the seat surface. From the prior art a variety of embodiments are already known. Exemplary is the DE 101 31 794 A1 called. In these previously known constructions, it proves to be disadvantageous that they require a relatively large amount of space and complex complex designs on which require high manufacturing costs in addition to the required space.

The invention has for its object to provide a seat adjustment of the aforementioned type, which requires a small footprint with a simple design and simple, cost manufacturability and is particularly suitable for electric wheelchairs for young people.

According to the invention the object is achieved by the feature combination of claim 1. The subclaims show further advantageous embodiments of the invention.

According to the invention it is thus provided that the seat adjustment device for stepless height and tilt adjustment of a seat frame has a vertically arranged height adjustment and a tilt drive, wherein the height adjustment is arranged on a base frame and supports a vertically adjustable seat receiving frame at its upper end. Thus, the entire seat receiving frame can be adjusted vertically by means of the height adjustment. The remaining basic functions of the seat adjustment are not affected or needed.

Furthermore, the invention provides that on the seat receiving frame about an axis of rotation pivotally mounted the seat frame, on which a seat is mounted in the usual way. According to the invention, the inclination drive is mounted horizontally on the seat receiving frame, the end region of which is connected to an end region of the seat frame by means of a four-joint mechanism. Thus, according to the invention by the horizontally arranged tilt drive tilting or tilting of the seat frame and thus the seat. This results in the advantage that the horizontal arrangement of the tilt drive requires only a minimal space requirement, so that the tilt drive can be arranged within the seat receiving frame. He is therefore in the non-actuated state, i. h., Not visible in the non-tilted state of the seat frame, so that overall a small size, in particular height results. This also contributes to an optimized visual appearance of the seat adjuster and a provided with this wheelchair.

The tilt drive is preferably arranged centrally in the seat receiving frame and thus installed below the seat frame. This allows optimized power transmission, so that the affected components can be made smaller overall.

Due to the rear articulated mounting of the seat frame to the seat receiving frame, it is possible to design the seat receiving frame with a short length and extend formed only in one direction, to accommodate the corresponding axes of rotation and hinges.

Both the inclination drive and the height adjustment drive according to the invention are electrically driven and designed in the form of telescopically designed drives.

In a favorable development of the invention it is provided that the axis of rotation about which the seat frame is pivotally mounted on the seat receiving frame, is arranged horizontally. Furthermore, according to the invention preferred manner provided that the tilt drive is mounted pivotably about a horizontal axis of rotation on the seat receiving frame. Thus, it is possible to arrange the two axes of rotation directly adjacent to each other and to install at a small distance from each other. This also means that a very small space can be realized.

The four-joint mechanism preferably comprises a member, which is pivotally mounted on the seat receiving frame by means of a horizontal axis of rotation. The member is pivotally connected at its central region by means of a horizontal axis of rotation with the tilt drive. The free end of the member is pivotally coupled by means of a horizontal axis of rotation with another member which is pivotally connected via a horizontal axis of rotation with the seat frame. This results in a simply constructed, compact ausgestalteter four-joint mechanism, which in small size and low weight allows a tilt or tilt of the seat frame and thus the seat.

In the following the invention will be described by means of an embodiment in conjunction with the drawing. Showing:

1 a perspective view of an embodiment of the seat adjustment device according to the invention,

2 a side view, analog 1 , and

3 a side view, analog 2 , with height-adjusted, non-tilted seat frame.

According to the invention is a base frame 1 provided, which two lateral struts 15 includes, where a rear wheel bearing 16 intended. At the front ends of the struts 15 is each a front wheel bearing 17 intended. In the front area are the two struts 15 by means of a cross yoke 18 connected. At the bottom of the cross yoke 18 is a height adjustment drive 2 arranged, which is designed in the form of a vertically mounted lifting column.

The height adjustment drive 2 is fixed with a horizontally arranged seat receiving frame 3 connected. The terms "vertical" and "horizontal" refer in the context of the invention to the orientation of the seat adjustment in the ready state in which it is installed in a wheelchair.

The seat mounting frame 3 has at its rear portion an axis of rotation 9 on, by means of which a seat frame 8th pivotable on the seat mounting frame 3 is stored.

The rotation axis 9 is arranged horizontally. Parallel to this and at a small distance in front of this is another axis of rotation 10 provided by means of which a tilt drive 4 is stored.

The height adjustment drive 2 and the tilt drive 4 are designed as electrically actuated, variable length drives in the axial direction.

At the free end of the pitch drive 4 is a rotation axis 12 provided, which pivotally with a member 6 connected is. The Member 6 is at its middle area on the tilt drive 4 stored while the lower portion of the limb 6 by means of a rotation axis 11 on the seat receiving frame 3 is stored. An upper end of the limb 6 is by means of a rotation axis 13 swiveling with another limb 7 connected. This in turn is via a swivel joint 14 with the seat frame 8th coupled.

The reference number 5 shows an extension, which with the tilt drive 4 connected is.

According to the invention is thus on the seat receiving frame 3 to the first of the seat frame 8th over the axis of rotation 9 , to the second the pitch drive 4 over the axis of rotation 10 and the third is the link 6 over the axis of rotation 11 stored. The Member 6 is thus with the tilt drive 4 and the extension 5 over the axis of rotation 12 connected. The Member 7 is on one side about the axis of rotation 13 with the limb 6 and on the other side with the seat frame 8th over the hinge 14 connected. Thus, there is a four-joint mechanism for adjusting the inclination or tilting of the seat frame 8th ,

The 2 shows a state in which no height adjustment was made, but the seat frame 8th was pivoted by an angle α. The seat angle α is changed by the tilt drive 4 due to an electrical control its length changed. The extension of the tilt drive 4 is due to the arrangement of the limb 6 and the limb 7 translated in the force and direction of action, leaving the seat frame 8th the seat angle α to the base frame 1 around the axis of rotation 9 changed.

The 3 shows a height-adjusted, not inclined state. The seat height H is changed by the height adjustment drive 2 due to an electrical control its length changed. Thus, the distance between the base frame 1 and the seat receiving frame 3 and thus the entire seat unit varies.

LIST OF REFERENCE NUMBERS

1

base frame

2

vertical adjustment

3

Seat receiving frame

4

tilt drive

5

renewal

6, 7

element

8th

seat frame

9-13

axis of rotation

14

swivel

15

strut

16

rear storage

17

front storage

18

crosshead

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10131794 A1 [0003]

Claims (5)

Seat adjustment device for stepless height and tilt adjustment of a seat frame ( 8th ), in particular for a wheelchair, with a vertically arranged height adjustment drive ( 2 ) and a tilt drive ( 4 ), characterized in that the height adjustment drive ( 2 ) on a base frame ( 1 ) is arranged and at its upper end portion a vertically adjustable seat receiving frame ( 3 ) and that on the seat receiving frame ( 3 ) about a rotation axis ( 9 ) pivoting the seat frame ( 8th ) is mounted, wherein on the seat receiving frame ( 3 ) horizontally the inclination drive ( 4 ), whose end region by means of a four-joint mechanism ( 3 . 6 . 7 . 8th ) with an end portion of the seat frame ( 8th ) connected is. Device according to claim 1, characterized in that the axis of rotation ( 9 ) is arranged horizontally. Apparatus according to claim 1 or 2, characterized in that the inclination drive ( 4 ) about a horizontal axis of rotation ( 10 ) pivotally mounted on the seat receiving frame ( 3 ) is stored. Device according to one of claims 2 or 3, characterized in that the axes of rotation ( 9 . 10 ) are arranged directly adjacent to each other. Device according to one of claims 1 to 4, characterized in that the four-joint mechanism is a member ( 6 ), which by means of a horizontal axis of rotation ( 11 ) on the seat receiving frame ( 3 ) is pivotally mounted, that the member ( 6 ) at its central region by means of a horizontal axis of rotation ( 12 ) pivotable with the tilt drive ( 4 ) and that the free end of the member ( 6 ) by means of a horizontal axis of rotation ( 13 ) with a member ( 7 ) is pivotally coupled, which pivotally about a horizontal axis of rotation ( 14 ) with the seat frame ( 8th ) connected is.

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