DE202004007928U1 - wheelchair - Google Patents

Abstract

The wheelchair is assembled of a seat (10) and a backrest (19), two manually driven large wheels (1), a telescopic footrest (15) and two small swivel mounted front wheels (3). Each of the front wheels (3) is joined to the lower end of a bar (7) axially movable inside an outer bar (6) in order to raise the front of the seat area (10). The outer bars (6) have the curved shape of a part of a circle which has its center (5) at the hub of the large wheels (1).

Description

The invention relates in detail on a wheelchair with a frame on the rear area a drive wheel is mounted on each side and on which front area laterally one by means of a swiveling Steering fork mounted steering wheel or front wheel is attached.

Wheelchairs of the type described are in a wide variety of designs from the prior art known. In general, such wheelchairs be set up in such a way that they can be easily addressed to the different Requirements are customizable. These are, in particular, setting options to adapt to different body sizes, different seat heights and different Seat depths. It is known to build a modular wheelchair frame. By exchanging the modules or changing the assembly of the individual ones Modules, the frame of the wheelchair can be modified accordingly. This procedure is associated with a very high assembly effort, holds many Assembly errors and is in terms of manufacturing costs as well the cost of the conversion of the frame geometry is unfavorable. The same applies to constructions in which a seat element can be reassembled or in which the positions of the individual wheels by change the articulation of the wheel axles is variable.

The invention is based on the object to create a wheelchair of the type mentioned, which a simple structure and simple, inexpensive to manufacture easy adjustment of different seat heights and inclinations.

According to the invention, the object is achieved by Combination of features of the main claim solved, the sub-claims show further advantageous embodiments of the invention.

According to the invention it is therefore provided that the steering fork of the respective steering wheel or front wheel on one telescopic steering wheel mounting tube is mounted, which is formed part-arc is, the center of the circular arc essentially on the Axis of rotation of the respective drive wheel (rear wheel) arranged is.

The wheelchair according to the invention stands out through a number of significant advantages.

Due to the telescopic design of the steering wheel receiving tube and due to its arcuate shape remains Center of curvature of the Steering wheel mounting tube always unchanged, independently from the telescopic position of the steering wheel support tube. So this can can be pushed in or pulled out to the desired seat height or inclination the seat to realize. This process can also be done by inexperienced operators performed easily and quickly become. This is particularly favorable in the case of wheelchairs are only to be used for a short time by the respective person. costly Adjustment and assembly steps can thus completely omitted. Is particularly cheap it when the steering wheel support tube is an outer, upper telescopic tube which is connected to the frame and one in it run inner, lower telescopic tube on which the steering fork is mounted is. This allows the upper area of the steering wheel mounting tube (outer, upper Telescopic tube) advantageously integrated in the rest of the frame structure without affecting the adjustability.

It is particularly favorable if the pivot axis the steering fork in a substantially vertical orientation the inner, lower telescopic tube is arranged. The pivot axis thus changes the steering fork, around which the front wheel can be pivoted, is not their position when the seat height is adjusted by telescoping the steering wheel mounting tube. The The driving characteristics of the wheelchair do not change. This is a very important advantage of the wheelchair according to the invention differs from the constructions known from the prior art.

The pivot axis is preferred in a storage case added, which is connected to the inner, lower telescopic tube is. This results in a stable construction, the adjustability according to the invention and design of the steering wheel receiving tube is not affected.

According to the invention, all adjustment measures can thus to adjust the chassis. Rather, the user needs the wheelchair only telescopically closes the steering wheel support tube adjust. This results in a high degree of operational reliability the wheelchair according to the invention.

It is also beneficial if the wheelchair is a seat element comprises, which is adjustably mounted on the frame. hereby there is the possibility additional Make adjustment steps.

Also contributes to easy adjustability when the steering wheel receiving tube is gradually adjustable, more preferred Way by means of a locking device. So no additional Tools needed to make the adjustment.

The steering wheel support tube can also be infinitely adjustable and for example by means of a clamping device be fixed.

The invention is described below of an embodiment described in connection with the drawing. It shows:

1 2 shows a schematic partial side view of a wheelchair according to the invention,

2 a perspective side front view of the in 1 shown wheelchair, and

3 a perspective side rear view of the wheelchair according to the invention.

The wheelchair according to the invention comprises a rigid, not collapsible frame which at the rear areas each have a side drive wheel 1 is stored, which can be operated manually. The wheel axles are on a common axle strut 11 stored. From the axle strut 11 lateral spars extend 12 forward, the front ends of each with a steering wheel mounting tube 4 are connected or pass into this. A front cross strut helps to increase stability 13 at which telescopic footrest struts 14 are stored, which is adjustable in height a common footplate 15 to store.

The steering wheel mounting tube 4 includes an outer, upper telescopic tube 6 , which has a connecting strut 16 with the respective footrest strut 14 connected is. In the outer, upper telescopic tube 6 is telescopically an inner, lower telescopic tube 7 guided.

The steering wheel mounting tube 4 is formed in the form of an arc or a partial arc in the side view. How especially out

1 can be seen (see radius 17 ), lies the center 5 of the pitch circle of the steering wheel mounting tube 4 essentially on the axis of rotation of the drive wheel 1 , A telescopic handlebar tube 4 thus leads to a pivoting of the frame or in particular the spars 12 to the center 5 that with the axis of the drive wheel 1 coincides. As a result, the seat height can be adjusted in a particularly simple and effective manner.

On the inner, lower telescopic tube 7 is a bearing sleeve 9 attached, which is a pivot axis 8th a steering fork 2 stores or defines. On the steering fork 2 is a steering wheel 3 (Front wheel) stored. By swiveling the steering fork 2 the wheelchair is steered in order to implement cornering.

The steering wheel mounting tube 4 is adjustable by means of a step-shaped latching device, not shown in detail. For this purpose, a push-in locking button or the like can be provided, for example, in order to enable adjustment or locking in individual stages. The same applies to the footrest strut 14 ,

There is a seat element on the frame of the wheelchair 10 stored, which side seat stays 18 includes that in back struts 19 pass over, which in turn is a backrest 20 to store. The two seat stays 18 are at their rear end on a bearing plate 21 adjustable. The bearing plate 21 has a large number of holes for this (see 2 and 3 ), which with an elongated hole rail of the respective seat strut, not shown in detail 18 can be screwed. This is an angular adjustment of the seat stay 18 possible to do this on a front bearing plate on the respective spar 12 is stored. The bearing plate 22 can also on the seat stays 18 be attached. It is thus possible to adjust the position of the seat surface element with respect to its angular orientation.

1

drive wheel

2

steering fork

3

steering wheel

4

Steering wheel holding tube

5

Focus

6

Outer, upper telescopic tube

7

Interior, lower telescopic tube

8th

swivel axis

9

bearing sleeve

10

Seat element

11

Torque rod

12

Holm

13

crossmember

14

Fußstützenstrebe

15

footplate

16

connecting strut

17

radius

18

seat stay

19

back strut

20

backrest

21

bearing plate

22

bearing plate

Claims (10)

Wheelchair with frame, on the rear area of which there is a drive wheel ( 1 ) is mounted and on which at the front area laterally by means of a swivel steering fork ( 2 ) a steering wheel ( 3 ) is mounted, characterized in that the steering fork ( 2 ) on a telescopic steering wheel mounting tube ( 4 ) is mounted, which is designed in the form of an arc of a circle, the center point ( 5 ) of the circular arc essentially on the axis of rotation of the respective drive wheel ( 1 ) is arranged. Wheelchair according to claim 1, characterized in that the steering wheel receiving tube ( 4 ) an upper telescopic tube connected to the frame ( 6 ) and a lower telescopic tube guided in it ( 7 ) on which the steering fork ( 2 ) is stored. Wheelchair according to claim 2, characterized in that the pivot axis ( 8th ) the steering fork ( 2 ) in a substantially vertical orientation on the lower telescopic tube ( 7 ) is arranged. Wheelchair according to one of claims 1 to 3, characterized in that the pivot axis ( 8th ) the steering fork ( 2 ) in a bearing sleeve ( 9 ) which is connected to the lower telescopic tube ( 7 ) connected is. Wheelchair according to one of claims 1 to 3, characterized in that the pivot axis ( 8th ) the steering fork ( 2 ) in a bearing sleeve ( 9 ) given up which is with the steering fork ( 2 ) connected is. Wheelchair according to one of claims 1 to 5, characterized in that a seat element ( 10 ) is adjustably mounted on the frame. Wheelchair according to one of claims 1 to 6, characterized in that the steering wheel receiving tube ( 4 ) is gradually adjustable. Wheelchair according to one of claims 1 to 7, characterized in that the steering wheel receiving tube ( 4 ) is adjustable by means of a locking device. Wheelchair according to one of claims 1 to 6, characterized in that the steering wheel receiving tube ( 4 ) is continuously adjustable. Wheelchair according to one of claims 1 to 9, characterized in that the steering wheel mounting tube is adjustable by means of a clamp connection.