FI90625B - Wheelchair - Google Patents

Abstract

A wheelchair comprises a frame assembly and, in the rear section of the frame assembly, rotatably attached steering arms 9 having at their free ends fixed roller devices 24. The wheelchair comprises locking devices 22 for locking the steering arms 9, which are provided with roller devices, in a position in which the roller device on one or more steering arms has been designed to act as a substitute wheel for the wheelchair's actual wheels. The steering arms have devices for altering the distance between the steering arms' articulations and the roller devices, and further the roller devices 24 have been attached to the steering arms via attachment arms 25, the form of which deviates from the form of a straight arm. <IMAGE>

Description

! 90625

Wheelchair

The invention relates to a wheelchair comprising a frame structure with side structures, a backrest and an is-5 support part, a plurality of wheels for moving the wheelchair, and handling arms rotatably attached to the rear of the frame structure, adapted to be pivotable from a substantially vertical base position, i.e. inverted to the operating position-10 are directed rearwardly, the handling arms comprising roller members attached to the free ends of the handling arms.

The wheelchair is perhaps the most important aid developed for the disabled person. With the help of a wheelchair, a person with reduced mobility is able to move from one place in the country to another. However, a person using a wheelchair always finds himself in situations where mobility in a wheelchair becomes difficult due to various obstacles. Such obstacles can include, for example, thresholds, staircases, vehicle doorways, terrain obstacles such as rocks, and many other types of obstacles.

Various accessories have been developed for wheelchairs to improve the wheelchair's performance. As an accessory, the handling arms are accelerated to the rear of the wheelchair, which in the basic position point downwards and can be pivoted into the operating position, in which position two adjacent handling arms form an aid for gripping or lifting the wheel by a person with reduced mobility.

30 In currently known wheelchairs, the handling arms articulated to the rear of the wheelchair are quite simple in structure. The known handling arms only comprise an arm part which can be turned up when an outside person comes to assist a person in a wheelchair. In known wheelchairs, the handling arms 2 90625 can only be used in their position of use, i.e. in the position in which the long arm parts of the handling arms point backwards. The handling arms have not previously been locked in their basic position, but have in their basic position va-5 pointed downwards. One of the structures described above is disclosed in SE-447698. In addition, a travel chair is known from patent publication FI-781632, which comprises rearwardly straight arms on which the chair rests on a base. In the latter patent publication 10, these arms are not used at all for handling the chair.

In addition, patent publication SE-8803785-8 discloses an arm structure which is used to assist in ascending stairs.

The wheelchair user also often has to pass through narrow door openings or similar places through which at least one wheel has to be removed from the wheelchair in order for the wheelchair to narrow sufficiently. After removing the wheelchair wheel, an auxiliary wheel or wheels on which the wheelchair rests on the ground or floor are mounted on the rear of the wheelchair or exposed from the structure 20 of the rear of the wheelchair.

In the prior art solutions, the above-mentioned structures have mainly been implemented as several separate structures, and their structure and placement in the wheelchair has been such that a device structure performing a specific function, for example acting as an auxiliary wheel, is only suitable for that purpose. Known solutions have separate rigidly attached auxiliary wheels and separate support arms. The travel chair already disclosed in the aforementioned patent publication 30 FI-781632 comprises an upper arm structure and a lower footrest. The upper arm structure with rollers is used in a rearward-facing position, i.e. in its position of use, to support the travel chair obliquely against the lowering ramp. The arm structure turns strongly to 35 sides, which makes it clear that the the structure is not suitable for replacing the actual wheel of a 3 90625 wheelchair, as the in the structure the width of the wheelchair increases. A separate footrest at the bottom is used to support the travel chair to the base. The structure in question is complex and consists of a number of separate parts, which are both expensive and deficient in use. Also, the structure described above cannot replace the actual wheel of the wheelchair.

It is an object of the present invention to provide a new type of wheelchair which avoids the problems associated with the known solutions. This object is achieved by a wheelchair according to the invention, characterized in that the wheelchair comprises locking means for locking the handle arms rotatably mounted and provided with roller members substantially vertically to a position in which one or more of the rotatably mounted but locked handles are locked in their basic position. to form a replacement wheel for the actual wheel of the wheelchair, that the handling arms comprise means for changing the distance between the articulation points of the handling arms and the roller members, that the roller members are attached to the handling arms by means of mounting arms at a distance around the axes formed by the handling arms.

The solution according to the invention is based on the integration of reversible auxiliary wheels and their mounting arms with rotatably mounted handling arms which can be locked in their lower position.

The wheelchair according to the invention achieves several advantages, since the structure of the pivotable handling arms attached to the rear part of the frame structure of the wheelchair is very versatile.

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In addition to the traditional handling arm function, the same handling arms have integrated auxiliary wheels, the attachment of which is designed to allow the wheel to be turned and the height to be changed. The solution 5 according to the invention forms a compact and versatile, strong and durable structure.

The invention will now be described in more detail with reference to the accompanying drawings, in which Figure 1 shows a wheelchair schematically in the transverse direction of a wheelchair, Figure 2 shows the wheelchair of Figure 1 seen from the opposite side; Fig. 4b shows a planar portion of the roller member mounting arm, Fig. 4c shows a cross-section of the handling arm with the roller member in the upper position, Fig. 4d shows a cross-section of the handling arm with the roller member in the lower position, Fig. 5 shows a perspective view

Referring to Figures 1, 2, 3 and 5, in particular Figures 1 and 2, the wheelchair comprises a frame structure comprising opposite side structures 1 and 2 connected by X-30 joints 3a, 3b. On the basis of the X-joint, the chair can be stacked in the transport position, i.e. the opposite side structures 1 and 2 of the frame structure can be brought closer to each other. The first side structure 1 comprises an upper body part 1a and a lower body part Ib. Respectively, the second side structure 2 comprises 35 an upper body part 2a and a lower body part 2b. The body parts 5 90625 are connected by connecting pieces 4a and 4b and further by a backrest 5 comprising first and second backrest parts 5a and 5b. The backrest is also part of the frame structure. In addition, the wheelchair comprises a seat part 6 and several wheels for moving the wheelchair 5, i.e. the actual wheels 7a and 7b, which are larger wheels and also smaller front wheels 8a and 8b. The handling arms 9 and 10 are rotatably attached to the rear of the wheelchair. In Fig. 1, the first handling arm 9 is shown in its substantially vertical basic position, i.e. in its lower position, turned away from the reference number 9. In the basic position, the handling arm 9 points downwards. Reference numeral 9 'denotes the handling arm in its extended operating position. In its extended operating position, the first handling arm 9 'points 15 backwards. Correspondingly, in Fig. 2, the second handling arm 10 is shown in its basic position, i.e. in its lower position, turned away from the reference number 10. In the basic position, the handling arm 10 points downwards. Reference numeral 10 'denotes the handling arm in its operative position when extended. In its extended operating position, the handling arm 10 'points backwards. When extended to their position of use, the handling arms 9'and 10 'form gripping arms for the person able to assist, from which the wheelchair can be lifted, guided or otherwise handled. The first handling arm 9 is articulated, i.e. pivotally attached to the rear of the wheelchair at the articulation point 12. Correspondingly, the second handling arm 10 is articulated, i.e. pivotally attached to the rear of the wheelchair at the articulation point 13. The first handling arm comprises an arm portion 9a which is an elongate arm 30. Correspondingly, the second processing arm 10 comprises an arm part 10a, which is also an elongate arm. In the extended operating position of the handling arms, the arm parts are indicated by reference numerals 9a 'and 10a'.

In the basic position 35, the handling arms 9 and 10 comprise means 14, β 90625 15 projecting rearwards from the arm parts 9a and 10a, which in the locked basic position, i.e. in the lower position, form handle parts 14 and 15 for handling the wheelchair. In the extended operating position of the handling arms, the handle parts are indicated by reference numerals 14 'and 5 15'. In the extended operating position of the handling arms 9 ', 10', the handle parts 14 'and 15' are adapted to rest on the frame structure of the wheelchair or a structural part connected to the frame structure. The support of the handle parts on the frame structure can thus be direct or indirect. The handle parts 14 '10 and 15' are adapted to rest on the backrest 5 of the frame structure. The first handle part 14 'rests on the backrest part 5a and the second handle part 15' rests on the backrest part 5b. The support of the handle parts 14 ', 15' on the backrest 5a, 5b improves and strengthens the support of the handling arms and enables 15 reliable handling of the wheelchair with the handling arms. The handle parts 14, 15 are fastened to the arm parts 9, 10 so that the handle parts 14 ', 15' rest on the frame, preferably on the backrest backrest parts 5a, 5b in the vicinity of the joint points 12, 13 on the upper side of the joint points 12, 13 and at least approximately parallel to the vertical backrest portions 5a and 5b. Preferably, the wheelchair comprises support means 16, 17 fixed to the frame structure, preferably to the backrest 5a, 5b, the shape of which at least partially corresponds to the shape of the surface of the handles 14 ', 15'. The above means in practice that the round handle part 14 'and 15' are counterbalanced by a support means 16, 17 having the shape of a round support surface attached to the backrest part 5a, 5b. The shape of the support means 17 is most clearly shown in Fig. 5.

In Fig. 5, the handling arm 10 is shown in its lower or basic position, i.e. turned off, with the arm part 10a pointing downwards. Figure 5 shows the locking of the treatment arm 10 to its lower or basic position by the locking means 23. The structure is also similar for the handling arm 35.

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Figures 1 to 3 and 5 also show locking means 22 and 23, of which the first locking means 22 are adapted to lock the first handling arm 9 in its basic position, i.e. in its lower position. The second locking means 23 are adapted to lock the second handling arm 10 in its basic position, i.e. in its lower position. Figures 2, and in particular Figure 5, show a preferred embodiment for the locking means of the second handling arm 10. The locking means 23 comprise a first locking part 23a fixed to the frame structure, a second locking part 23b fixed to the arm part 10a and a vertically movable pin 23c arranged to move inside the first and second locking parts 23a, 23b. The substantially vertically moving pin 23c has the advantage that the pin automatically returns to the lower position by gravity, where the pin 23c locks the arm part 10a from the second locking part 23b to the first locking part 23a fixed to the frame structure. The structure is also similar for the locking means 22 of the first concept arm 20, which are partly shown in Figures 1 and 3. In Figure 3, the first locking means 22 comprise locking parts 22a and 22b and a dowel piece 22c. In Figures 1-3, the locking means are shown partly in cross-section.

In Fig. 1, reference numeral 9 shows a processing arm locked in its lower or basic position. The handling arm 9 is locked in its basic position by the locking means 22. In this case, the handling arm 9 is in the out-turned position and cannot therefore be turned to the position indicated by the reference numeral 9 'by the locking means 22. Although the handling arm 9 itself has been turned to its basic position, i.e. out of view, it is still relevant in the position shown by reference numeral 9 in Fig. 1. It can be seen from Figure 1 that the treatment arm 9 comprises a roller member 24 arranged at the free end of the treatment arm 35. To attach the roller member s 90625 to the treatment arm, the wheelchair comprises a mounting arm 25 which is part of the roller member mounting means. In addition, the fastening means comprise a locking member 26 fixed to the handling arm 9. The fastening of the roller member 24 5 to the processing arm can be performed by contact between the locking member 26 and the fastening arm 25 of the roller member. In Figure 1, the fastening arm 25 of the roller member 24 is nested with the handling arm 9.

It can be seen from Fig. 1 that according to the invention 10 the roller member 24 at the end of a handling arm rotatably fixed but locked in its lower position, i.e. its basic position, is adapted to form an auxiliary wheel, i.e. a replacement wheel, for the actual wheel 7a removed from the wheelchair shown in Fig. 1. In Fig. 1 15 there is another actual wheel 7b in the background. In the case according to Figure 1, from the rear of the wheelchair, the wheelchair is held upright by a second actual wheel 7b and a first roller member 24, i.e. an auxiliary wheel 24, replacing the first actual wheel 7a, thus attached to the end of the first handling arm 9. Thus, if necessary, the roller member 24 forms a replacement wheel for the actual wheel 7a of the wheelchair.

With further reference to Figures 1 and 3, according to the invention, the treatment arm 9 comprises means for changing the distance between the articulation point 12 of the treatment arm 9 and the roller member 24, i.e. the auxiliary wheel. In this case, in the basic position, i.e. the lower position, of the handling arm 9, the roller member is adapted to be lifted out of use, i.e. substantially off the base, to the position shown in Fig. 3 by reference numerals 24 '' (roller member) and 25 '' (mounting arm). The position shown by reference numerals 24 '' and 25 '' in Fig. 3 is reached by releasing the fastening between the fastening arm and the handling arm, after which the fastening arm 25 and with it the roller member 24 are turned horizontally 180 degrees. 35 In this case, the roller member 24 '' no longer functions as an auxiliary wheel, but the roller member 90 905 is in the air below the frame structure 1b. According to the invention, the shape of the fastening arm 25 differs from the straight shape of the arm, whereby the roller member 24 is adapted to be rotatable by a distance 5 determined by the shape of the fastening arm 25 about the axis formed by the handling arm 9. The roller member and, of course, the fastening arm itself are thus obtained by rotating the fastening arm to a new position. The fastening arm of the roller member is arranged inside the handling arm, whereby the height position of the roller member can be changed. The fastening arm comprises an upper end 27 which, when the roller member is in the lower position against the base, i.e. as an auxiliary wheel, is naturally located relatively low inside the handling arm 9. When the roller member 24 '' is in its upper position, i.e. turned off and raised, then the upper end of the fastening arm 25 '' is located at a higher position, which is indicated by the reference number 27 ''.

In Fig. 1, the operating position of the handling arm 9, i.e. the position turned backwards, is indicated by reference numeral 9 '. Correspondingly, the roller member is indicated by reference numeral 24 '20 and the mounting member of the roller member is indicated by reference numeral 25'. In changing the position of the handling arm 9, the roller member 24 and the fixing arm 25 to the position shown by reference numerals 9 ', 24' and 25 'in Fig. 1, the locking means 22 are unlocked, whereby the handling arm 25 can be pivoted to its upper position. Next, the locking member 26 is unlocked, whereby the fastening arm 25 of the roller member and the roller member therein are rotated 180 degrees, with the mounting arm 25 '' pointing downward.

. The structure of the second side of the wheelchair shown in Figures 2 and 5 is substantially similar to the structure shown above in Figures 1 and 3. In Figure 2, reference numeral 10 shows a handling arm locked in its lower position, i.e. its basic position. The handling arm 10 is locked in its basic position 35 by locking means 23. In this case, the handling arm 10 is in the outwardly folded position 90625 and cannot be turned to the position indicated by reference numeral 10 ', i.e. to the rearward position, due to locking by the locking means 23. Although the handling arm 10 itself has been turned to its basic position, i.e. out of view, it is still relevant in the position shown by reference numeral 10 in Fig. 2. It can be seen from Figure 2 that the treatment arm comprises a second roller member 28 fitted to the free end of the treatment arm. To attach the roller member to the treatment arm 10, the wheelchair comprises a mounting arm 29 which is part of the roller member mounting means. In addition, the fastening means comprise a second locking member 30 attached to the handling arm 10. Attachment of the roller member 28 to the handling arm can be performed by contact between the locking member 30 and the fastening arm 29 of the roller member 15 28. In Fig. 2, the fastening arm 29 of the roller member 28 is nested with the handling arm 10.

It can be seen from Figure 2 that the second roller member 28 at the end of the handling arm 10 rotatably mounted according to the invention but locked in its lower position, i.e. the basic position 20, is adapted to form an auxiliary wheel, a replacement wheel, for the actual wheelchair 7b removed from the wheelchair shown in Figure 2. Figure 2 shows the first actual wheel 7a, which is in the background. In the case of Fig. 2, from the rear of the wheelchair, the wheelchair is held upright by a first actual wheel 7a and a second roller member 28, i.e. an auxiliary wheel 28, replacing the second actual wheel 7b, which is thus fixed to the second handling arm 10 by its fixing arm 30 29. The second roller member 28 thus, if necessary, forms a replacement wheel for the second actual wheel 7b of the wheelchair.

With further reference to Figures 2 and 5, according to the invention, the treatment arm 10 comprises means for changing the distance between the articulation point 13 of the treatment arm 35 10 and the roller member 28, i.e. the auxiliary wheel 11 90625. In this case, in the basic position, i.e. in the lower position, of the handling arm 10, the roller member 28 is adapted to be lifted out of use, i.e. substantially off the base, to the position shown in Fig. 5 by reference numerals 28 '' (roller member) and 29 '' (mounting arm). From the position 28, 29 in Fig. 2, the position shown by reference numerals 28 '' and 29 '' in Fig. 5 is reached by releasing the fastening arm 29 between the locking arm 29 and the handling arm 10, after which the mounting arm 10 and the roller member are pulled down and the mounting arm 29 and the second roller member 28 rotated horizontally 180 degrees. In this case, the roller member 28 '' no longer functions as an auxiliary wheel, but the roller member is in the air below the frame structure 2b according to Fig. 5. According to the invention, the shape of the fastening arm 15 29 differs from the straight shape of the arm, whereby the roller member 28 is adapted to be rotatable by a distance determined by the shape of the fastening arm 29 about an axis formed by the handling arm 10. The roller member 28 and of course also the fastening arm 29 itself are thus obtained by rotating the fastening arm 20 29 to a new position. The fastening arm 29 of the roller member is arranged inside the handling arm 10, whereby the height position of the roller member can be changed.

In a manner similar to the first mounting arm in Figure 3, the second mounting arm 29 in Figures 2 and 5 also has different positions within the handling arm 10.

In Fig. 2, the operating position of the handling arm 10, i.e. the position turned backwards, is indicated by reference numeral 10 '. Correspondingly, the second roller member is shown at 30-30 and the mounting arm of the roller is shown at 29. In Fig. 2, when the position of the handling arm 10, the roller member 28 and the fixing arm 29 is changed to the position indicated by reference numerals 10 ', 28' and 29 ', the locking means 23 are unlocked, the handling arm being pivotable to its upper position. Next, the locking member 30 is unlocked, whereby the roller member handling arm 29 and the roller member 28 therein are rotated 180 degrees, with the mounting arm pointing downward.

According to Figures 1 and 2, in a preferred embodiment of the invention, in the extended rearward operating position of the handling arms 9 'and 10', the fastening arms 25 'and 29' of the roller members 24 'and 28' form a length-adjustable and downwardly directed handle structure 32, 33 to the end of the handling arms. This structure allows the length of the handling arms to be changed depending on the type of person helping the wheelchair user. In addition, the downwardly directed handle structure improves the grip of 15 assisting personnel on the handling arms.

In a preferred embodiment of the invention, according to Figure 3, the roller member 24 '' is preferably adapted to be pivotable below the frame structure Ib of the wheelchair by a horizontal rotational movement. In this case, the auxiliary wheel, i.e. the roller member 20, can be easily turned off in use and correspondingly raised in the opposite movement. The structure is, of course, similar for the second roller member 28 and the second mounting arm 29.

Fig. 4a shows a roller member 24 and its mounting 25 arm 25, and Fig. 4b shows a planarly applied portion of the roller member mounting arm. The mounting arm 25 is preferably a tubular body of hollow cross-section comprising a thin wall 34a. A roller member 24 is attached to the lower end of the mounting arm. The mounting arm comprises an upper end 27, the location of which inside the handling arm in various situations has already been discussed above in connection with Fig. 3. The structures of the fastening arm and the surrounding handling arm form fastening means for the roller member 24 which allow the distance between the articulation point 35 12 of the handling arm and the roller member 24 to be changed. The mounting arm 25 comprises a sliding groove 35, which preferably comprises at least two substantially vertical parts 35a, 35b and a part 35c between them, which is preferably horizontal. Fig. 4c shows a cross-section of the handling arm with the roller member in the upper position, i.e. in the disabled position, i.e. in the position shown in Fig. 3 by reference numerals 24 '' and 25 ''. Fig. 4d shows a cross-section of the handling arm with the roller member in the down position, i.e. as an auxiliary wheel against the base, shown in Figs. 1 10 and 3 by reference numerals 24 and 25. The cross-section of Figs. 4c and 4d is taken at the upper edge of the horizontal portion 35c. In Figures 4c and 4d, for the sake of clarity, it is noted that the roller member is located furthest from the viewer, i.e. the lowest. The arm 9 of the treatment-15 comprises a thin wall 34b.

Referring to Figures 1 and 4a to 4d, in a preferred embodiment of the invention, the fastening arm 25 thus comprises a sliding groove 35, the handling arm 9 comprises a protrusion 36 to be fitted in the sliding groove 35 and a spring means 37 is arranged between the roller member fastening arm 25 and the handling arm 9. occurs in Figure 1, but it should be noted that the spring is in fact invisible inside the handling arm 9. In Figures 1, only the part of the projection 36 which is visible on the surface of the treatment arm 9 is shown. The protrusion in Figures 1 and 4c and 4d is a bolt attached to the treatment arm which horizontally pierces the wall 34b of the treatment arm and further in the sliding groove 35 of the mounting arm 25. Similarly in Figure 2 the second processing arm comprises a second protrusion 38, only part of which is shown in Figures 2. , which is visible on the surface of the treatment arm 10. Figure 2 also shows a second spring means 39 comprised by a second processing arm, which is in fact located inside the processing arm 10. The structure described above is a useful and reliable structure for fastening the fastening arms and thus also the roller members in a multi-purpose manner.

It can be seen from Figures 4a and 4b that the mounting arm 25 comprises two locking openings 40a and 40b. The locking openings 40a and 40b are for a locking member 26, which locking member 5 is shown in Figures 1 and 3. The locking member 26, like the second locking member 30 in Figure 2, is preferably a spring-return horizontal locking member which engages the lower locking opening 40a when the roller member is raised. 3, i.e. a position in which the fastening arm 25 '' of the roller member is relatively deep inside the handling arm 9. When the roller member 24 has been dropped to its lower position, i.e. as an auxiliary wheel, the locking member 26 settles in the upper locking opening 40b.

It can be seen from Figures 1, 2, 4a to 4d that in a preferred embodiment of the invention both the handling arm 9, respectively 10 and the roller member mounting arm 25, respectively 29, are hollow tubular bodies and are nested relative to each other and that the spring means 20 37, respectively 39, is arranged inside the assembly formed by the mounting arm and the handling arm. In this case, the spring means is arranged in such a way that it can easily ensure that the handling arm and the fastening arm remain attached to each other, in particular when the roller member 25 and thus also the fastening arm are being turned to a new position.

Figure 4a shows a lower attachment point 41a for the spring means on the attachment arm 25. Figures 1 and 3 show an upper attachment point 41b to which the upper end of the spring-30 means 37 can be attached. In fact, the upper attachment point is hidden inside the handling arm. In a preferred embodiment of the invention, the upper attachment point 41b of the spring means 37 is in the vicinity of the articulation point 12 of the handling arm 9. In this case, the placement of the spring is implemented in a practical manner.

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The spring means 37 is not shown in Figures 4c and 4d. In Figures 4c and 4d, the unlined area shows the middle part 35c of the sliding groove. Fig. 4c also shows a shorter vertical part 35a of the sliding groove, which is empty, 5 but at the bottom of the longer part of the vertical sliding groove a protrusion 36 is shown. In the position according to Fig. 4c, i.e. the roller member is in the upper position, the protrusion 36 in the base 43 of the part 35b (Figs. 4a, 4b) due to the upward pull of the spring means 37 ai-10. In the position according to Fig. 4d, i.e. with the roller member in the lower position, the projection 36 comprised by the handling arm 9 is located in the bottom 44 (Figs. 4a, 4b) of the shorter vertical part 35a of the sliding groove due to the upward pull caused by the spring means 37. The structure of the sliding groove 35 is most clearly seen in Figures 4a and 4b.

In a preferred embodiment of the invention, the substantially vertical sliding grooves 35a and 35b are arranged on opposite sides of the wall 34a of the mounting arm 25 according to Figures 20a and 4b. With the structure presented above, it is easy to realize the rotation of the roller members and thus also the fastening arms by a semicircle, i.e. about 180 degrees. It can be seen from Figures 4a and 4b that in a preferred embodiment of the invention the lengths of the vertical sliding grooves 35a and 35b differ significantly from each other, whereby the difference in the length of the sliding grooves provides the necessary height difference for different positions of the roller member. The length of the shorter sliding groove 35a is preferably at most a quarter of the length of the longer sliding groove.

Referring to Figures 1, 3 and 4a to 4c, it is noted that the rotation of the roller member and the mounting arm from the position of Figure 4c to the position of Figure 4d takes place preferably by pulling the locking member 26 horizontally, leaving the locking member 26 out of the lower locking opening 4a. Next, the mounting arm 90625 or 25 is pulled down against the spring force of the spring 37, whereby a longer vertical sliding groove 35b slides along the entire length of the protrusion 36. Next, the mounting arm is rotated, i.e., rotated horizontally, whereby the sliding groove 35c between the parts of the sliding groove in the longitudinal direction pi-5 slides along its entire length past the protrusion 36. Finally, the spring force of the spring 37 is adapted to pull the protrusion past the shorter vertical sliding groove part 35a, whereby the spring 37 also partially locks the fastening arm. Finally, it is ensured that the locking member 26 is made to settle in the upper locking opening in the mounting arm 25. When moving from the figures 4d to the position according to Figure 4c, the operation is reversed.

The sliding grooves of the mounting arms, the projections of the handling arms, the locking openings of the mounting arms and the locking members of the handling arms all belong to the means enabling the distance between the articulation points of the handling arms and the roller members to be changed effortlessly.

The distance between the locking openings 40a and 40b is substantially the same as the distance between the ends 43 and 44 of the vertical grooves 35a and 35b. In this case, the operation of the locking members is well compatible with the operation of the 'sliding grooves and projections''.

In Fig. 5, the hinge point 13 comprises a first hinge portion 13a and a second hinge portion 13b adapted to rotate relative to the first hinge portion 13a. The locking means 23 further comprise a lifting pin 23d attached to the pin piece 23c.

It is important for the structure according to the invention that the distance between the roller members placed at the end of the treatment arms is shorter than the distance between the actual wheels 7a and 7b.

Although the invention has been described above with reference to the examples according to the accompanying drawings, it is clear that the invention is not limited thereto, but can be modified in many ways within the scope of the inventive idea set forth in the appended claims.

Claims (8)

A wheelchair comprising a frame structure with side structures (1 and 2), a backrest (5) and a seat part (6), 5 several wheels (7a, 7b, 8a, 8b) for moving the wheelchair, and handling arms rotatably attached to the rear of the frame structure ( 9 and 10), which are adapted to be pivotable from their substantially vertical basic position, i.e. from their lower position, and which, when extended (9 '10 and 10') in their operating position, turn rearwards, the treatment arms (9 'and 10') comprising roller members fixed to the free ends of the treatment arms (24 ', 28'), characterized in that the wheelchair comprises locking means (22 and 23) for locking the handling arms (9 and 10) rotatably mounted and provided with roller members 15 (24, 28) substantially vertically in a position in which one or more rotatably mounted , but the roller member (24,28) of the handling arm (9,10) locked in its basic position, i.e. in its lower position, is adapted to form-2 0 for the actual wheel (7a, 7b) of the wheelchair of the ground replacement wheel, that the handling arms (9, 10) comprise means for changing the distance between the articulation points (12,13) of the handling arms (9,10) and the roller members (24,28), that the roller members (24, 28) is fastened to the handling arms 25 (9, 10) by means of fastening arms (25, 29) whose shape differs from the straight shape of the arm, the roller members (24, 28) being adapted to be rotatable by a distance determined by the shape of the fastening arms (25, 29). , 10) around the formed axes. : 30 Wheelchair according to Claim 1, characterized in that in the rearward-facing operating position of the handling arms (9 ', 10'), the fastening arms (25 ', 29') of the roller members (24 ', 28') are adjustable in length and the fastening arms 35 (25) ', 29') to the end of the handling arms (9 ', 10') of the downwardly directed handle structure (32, 33) as determined by the shape. Wheelchair according to Claim 1 or 2, characterized in that the fastening arm (25, 29) of the roller element (24, 28) has a sliding groove (35), that the handling arm (9, 10) comprises a sliding groove (35). 35) a spring means (37,39) is arranged between the fastening arm (25,29) of the roller member (24,28) and the handling arm (9,10). Wheelchair according to Claim 3, characterized in that both the handling arm (9, 10) and the fastening arms (25, 29) of the roller members (24, 28) are hollow tubular bodies and are nested relative to one another and that the spring means (37, 39 ) is arranged inside the assembly formed by the fastening arm (25,29) and the handling arm (9,10) 15. Wheelchair according to Claim 3 or 4, characterized in that the sliding groove (35) comprising the fastening arm (25, 29) of the roller element (24, 28) comprises at least two substantially vertical sliding grooves (35a, 35b) and at least one other a sliding groove (35c) located between the vertical sliding grooves (35a, 35b). Wheelchair according to Claim 5, characterized in that the substantially vertical sliding grooves (35a, 35b) are arranged on opposite sides of the fastening arm (25, 29). Wheelchair according to Claim 5 or 6, characterized in that the lengths of the vertical sliding grooves (35a, 35b) differ significantly from one another. Wheelchair according to claim 1, characterized in that the locking means (22, 23) comprise a first locking part (22a, 23a) fixed to the frame structure, a second locking part (22b, 23b) fixed to the arm part (9a, 10a) and a vertically movable a dowel body (22c, 23c) adapted to move:. 35 inside the first locking part (22a, 23a) and the second locking part (22b, 23b). 20 90625