EP2070500A1 - Zusammenklappbarer Rollstuhl mit einer Rahmenanordnung mit x-förmigen Querverstrebungen - Google Patents

Zusammenklappbarer Rollstuhl mit einer Rahmenanordnung mit x-förmigen Querverstrebungen Download PDF

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Publication number
EP2070500A1
EP2070500A1 EP07123240A EP07123240A EP2070500A1 EP 2070500 A1 EP2070500 A1 EP 2070500A1 EP 07123240 A EP07123240 A EP 07123240A EP 07123240 A EP07123240 A EP 07123240A EP 2070500 A1 EP2070500 A1 EP 2070500A1
Authority
EP
European Patent Office
Prior art keywords
link
frame assembly
frame
wheelchair
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07123240A
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English (en)
French (fr)
Inventor
Dirk Dauw
Erich Glanzmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Invacare International SARL
Original Assignee
Invacare International SARL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Invacare International SARL filed Critical Invacare International SARL
Priority to EP07123240A priority Critical patent/EP2070500A1/de
Publication of EP2070500A1 publication Critical patent/EP2070500A1/de
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/08—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs foldable
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/08—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs foldable
    • A61G5/0808—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs foldable characterised by a particular folding direction
    • A61G5/0816—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs foldable characterised by a particular folding direction folding side to side, e.g. reducing or expanding the overall width of the wheelchair
    • A61G5/0825—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs foldable characterised by a particular folding direction folding side to side, e.g. reducing or expanding the overall width of the wheelchair comprising a scissor-type frame, e.g. having pivoting cross bars for enabling folding
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10—Parts, details or accessories
    • A61G5/1054—Large wheels, e.g. higher than the seat portion

Definitions

  • the present invention relates in general to foldable wheelchairs, and more particularly, to wheelchairs which have X-shaped cross-bracing frame assemblies that fold or scissor to allow the side frames of the wheelchairs to be moved between a spaced apart deployed position for use and a folded position for storage or transport.
  • Each left and right link element is pivotally attached to the corresponding upper tube of the side frame and also to the corresponding strut, so that folding of the wheelchair is allowed for by the pivoting connections of the cross-struts to the tubes of the left and right side frames of the wheelchair.
  • the side frames of the foldable wheelchairs form two planes that are ideally situated parallel with respect to each other.
  • the side frames have the tendency not to stay in parallel but assume a V-shape, with the upper side frames staying apart from each other.
  • This can also be referred to as a splaying or tilting of the side frames during folding, due to the geometry of the articulation provided by the link element together with the cross-struts, comprising as many as 7 pivoting axis.
  • the link element experiences forces in its longitudinal axis during folding, and thus resisting to the side frames getting together in parallel.
  • the distance between the two pivoting attachments of an individual link element, one to the upper side frame tube and the other to a cross-strut is transitionally reduced during the folding and unfolding process.
  • the upholstery on the backrest may oppose to the backrest tubes assuming a V-shape, which means in the end that more force has to be applied to unfold the wheelchair.
  • the force to be overcome increases and may become too hard for some people to overcome.
  • US 2006/0145456 proposes a link assembly having a variable length in the direction extending transversely between the side frames.
  • a spring is used to provide a variable length which compensates for the reduction of the distance during folding.
  • the use of a flexible element such as a spring decreases the overall stability and/or rigidity of the attachment provided by the link element.
  • a link element pivotally connecting an upper frame tube to an upper section of a cross-strut of a cross-strut assembly of the foldable wheelchair was mounted at a supporting structure at a side frame of the wheelchair.
  • the extent of splaying can be modified and in particular reduced.
  • the present invention provides a foldable wheelchair, a foldable wheelchair frame assembly, and a link assembly as defined in the appended claims.
  • Figure 1 is a front view of a foldable wheelchair according to the present invention.
  • Figure 2 is a perspective view of a foldable wheelchair frame assembly of the present invention in an unfolded position.
  • Figure 3 is a perspective view of the foldable wheelchair frame assembly of Figure 2 in a folded position.
  • Figure 4 is a lateral view of the foldable wheelchair frame assembly of Figure 2 in an unfolded position.
  • Figure 5 is a perspective exploded view of a first embodiment of a link assembly of the present invention.
  • Figure 6 is a front view of a link element used in the link assembly shown in Figure 5 .
  • Figure 7 is a left side front view of the assembled link assembly of Figure 5 .
  • Figure 8 is a top view of the assembled link assembly of Figure 5 .
  • Figure 9 is a perspective exploded view of a second embodiment of a link assembly according to the present invention.
  • Figure 10 is a perspective exploded view of a third embodiment of a link assembly according to the present invention.
  • the wheelchair of the present invention is now illustrated by way of example with reference to the appended drawing figures. Due to the largely mirror-symmetrical constitution of the wheelchair, with many elements appearing pair wise, in the following the left side of the wheelchair are mainly referred to, with corresponding elements on the right side generally having the same reference number in the figures, indicated with the sign '.
  • Figure 1 shows a foldable wheelchair according to the present invention, in a position which is about midway between the folded and the unfolded position. Situations and directions of axis of elements of the wheelchair are determined by the perspective of a user seated in the wheelchair. Accordingly, the left side of the wheelchair corresponds on the right side of Figure 1 and vice versa. The situations or directions “up” or “top”, “down” or “bottom”, “rear” or “back” and “front” follow the same rule.
  • Figure 1 is a front view of an embodiment of the wheelchair of the present invention.
  • the wheelchair of Figure 1 comprises left and right side wheels 2, 2', turnably mounted on left and right side frames 3, 3' of the wheelchair.
  • the side-frames comprise upper frame tubes 8, 8' and lower frame tubes 9, 9', which are basically horizontally and parallely arranged in a rear-to-front orientation on each side of the wheelchair.
  • Each left and right side frame further comprises rear and front side frame tubes 11, 11'; 10, 10', which are basically vertically arranged in a bottom-to-top orientation.
  • the rear and front side frame tubes 10, 11 are basically oriented in parallel to each other, while, during the folding process, due to the geometry of the cross-struts assembly discussed further below, a splaying occurs, as can be seen in Figure 1 . It is a goal of the present invention to reduce the extent of this splaying thus approaching a substantially parallel orientation of the entire side frames during the folding and unfolding process.
  • Each rear side frame tube 11, 11' further extends to form a backrest-holding tube 12, 12', supporting a backrest upholstery.
  • the left and right backrest-holding tubes 12, 12' have a diameter that is smaller than that of the respective rear side frame tube 11, 11', and that matches the inner diameter of the rear side frame tubes.
  • the backrest holding tubes are thus stabilised by being inserted and mounted in an inner lumen of the rear side frame tubes 11, 11'.
  • Figure 1 further shows the cross-bracing frame assembly 4 of the present invention, comprising left and right cross-struts 13, 13'.
  • the "left" cross-strut is the cross-strut 13 which is pivotally attached, with its lower end, to the lower right side frame tube 9'
  • the "right” cross-strut is the cross strut 13' that is pivotally attached, with its lower end, to the lower left side frame tube 9.
  • Both cross struts 13, 13' are pivotally connected to each other by an axis 7, which lies about in the middle of the cross-struts 13, 13'.
  • each cross strut that lies above the connecting point 7 is the upper section of the cross strut 13, 13', while a section of each cross strut extending below connecting point 7 is considered as the lower section of the respective cross-strut.
  • the cross-bracing frame assembly further comprises a lose seat 6, which, in the partially folded wheelchair of Figure 1 is seen in a partially folded, non-tight state.
  • the seat 6 is supported on longitudinal left and right seat tubes 17, 17', with the left seat tube 17 being perpendicularly attached to the left cross-strut 13 at the top end of the latter.
  • the left seat tube 17 and the left cross-strut 13 thus form a T-shaped structure, which is characteristic for many foldable wheelchairs. The same applies to the corresponding right side elements of the cross-bracing frame assembly.
  • each link assembly comprises left and right link elements 14, 14', wherein a left link element 14 is pivotally mounted, with its left-side external end, on a left upper side frame tube 8 and, with its other, inner end, to an upper section of the left cross strut 13.
  • a right link element 14' is pivotally mounted, with its right-side external end, on a right upper side frame tube 8' and, with its other, inner end, to an upper section of the right cross strut 13'.
  • a U-shaped section in each link element 14, 14' can be seen in Figure 1 .
  • FIG. 2 shows a foldable wheelchair frame assembly (50) for a wheelchair of the present invention, including the left and right side frames 3, 3' and the cross-bracing frame assembly 4.
  • the wheels, backrest and further components of the wheelchair do not form part of the cross-bracing frame assembly and are not shown in Figure 2 .
  • These latter elements being not shown, the nature of the attachment of the left link element 14 to the left upper side frame tube 8 can be seen in more detail.
  • the invention will further be described with respect to the left sided elements visible in Figure 2 .
  • a link assembly comprises a supporting structure 19, mounted on the upper side frame tube 8 and pivotally harbouring the left link element 14 at its left, outer extremity.
  • the supporting structure 19 determines the attachment of the link element 14 at the upper side frame tube 8 and the axis of pivoting of the link element 14 at the upper side frame tube 8.
  • the axis of pivoting of the link element 14 is parallel, but not coaxial to the axis of the upper side frame tube 8.
  • the axis of pivoting of the link element 14 at the upper side frame tube 8 is displaced to be situated below, preferably vertically below the axis of the upper side frame tube 8. As will be illustrated in further detail below, this displacement of the axis of the link element on the upper side frame tube in a downward direction results in a diminution of the splaying of the side frames during folding.
  • FIG. 2 also reveals the nature of the pivotal attachment of the bottom end of each cross strut 13, 13' on the respective lower side frame tubes 9, 9'. It can be seen that the right cross-strut 13' is attached, at its bottom end, to a sleeve 18, which has the same diameter as the left lower side frame tube 9, and which is coaxial with it. Accordingly, pivoting of the right cross-strut 13' pivotally attached to the lower left side frame tube 9 occurs around an axis corresponding to that of the lower side frame tube 9.
  • the seat tubes 17, 17' abut against and are supported by left and right seat support elements 20, 20', 21, 21', mounted on the upper side frame tubes 8, 8'.
  • Each side frame 3, 3' contains two seat support elements, one 21, 21' mounted towards the front end of the upper side frame tube 8, 8' and one 20, 20' towards the corresponding rear end of the upper side frame tube 8, 8'.
  • the seat support elements are designed so as to provide a stable support to the seat frame tubes and thereby, to the seat. Accordingly, the seat is stabilised by the side frames, which thus carry the weight of a wheelchair user seated in the wheelchair.
  • the seat tubes 17, 17' are thus stabilised on the inner side next to the upper side frame tubes 8, 8'.
  • the seat tubes are stabilised on the upper side of the upper side frame tubes 8, 8', for example.
  • left and right frame assemblies 3, 3' in Figure 2 are different from those in Figure 1 and thus represent a different embodiment.
  • the front vertical side frame tubes 10, 10' are slightly skewed in Figure 2 , in contrast to the embodiment shown in Figure 1 .
  • this does not affect in any way the functioning of the foldable wheelchair frame assembly of the present invention.
  • Figure 3 shows the wheelchair frame assembly 50 of Figure 2 in a completely folded position.
  • the cross-struts 13, 13' and also longitudinal section of the link elements 14, 14' are in a vertical or close-to-vertical orientation, with the side frames 3, 3' being in the most approached position.
  • the rear and front, left and right seat tube support elements 20, 20', 21, 21', mounted on the upper side frame tubes 8, 8' are displaced with respect to each other in a rear-to-front direction so as not to hinder the folding of the wheelchair by abutting against each other.
  • the U-shaped section of each link element 14, 14', in Figure 3 encompasses about half or a little less of the respective upper side frame tubes 14, 14'.
  • the U-shaped geometry of the link element 14, 14' is thus designed so as not to hinder the folding by abutting against the upper side frame tubes 8, 8', thus allowing maximum approximation of the left and right side frames 3, 3' in the folded position. Accordingly, the U-shaped section of the link element 14, 14' is a technical consequence of the fact that the axis of pivoting of the link element attached to the upper side frame tube 8, 8' is situated below, preferably vertically below the upper side frame tubes 8, 8'.
  • Figure 4 shows the wheelchair frame assembly of Figure 2 in a left lateral view, in which the frame tubes of the right side frame 3' are substantially hidden.
  • Figure 5 shows in further detail the supporting structure 19 for pivotally mounting the link element 14 to the upper side frame tube 8 (not shown).
  • the link element 14 comprises an annular or hollow cylindrical part 30 at its one (outer) extremity, which serves to the pivotal attachment at the upper side frame tube 8 (not shown).
  • An oblong component of the link element first follows a U-shape 31 and then assumes a more straight section 32, which comprises openings 40, enabling pivotal attachment of the other (inner) extremity of the link element 14 to the respective cross-strut 13.
  • transitional section 33 which has an inwardly bent, slightly S-shaped configuration, for the purpose of approaching the straight section at the inner extremity of the link element to the respective cross strut 13 and enabling optimal pivotal attachment to the latter.
  • the supporting structure 19 comprises rear and front link-standoff elements 34, 35, each of which carries or comprises a cylindrical section 36, 37, having a diameter equal or slightly smaller that the inner diameter of the annular section 30 of the link element 14, so that the cylindrical sections 36, 37 together form an axle of pivoting for the link element at the upper side frame tube.
  • the link-standoff elements are mounted at the underside of the upper side frame tube 8 (not shown) by screws 38, 39, stably and pivotally attaching the link element 14 to the side frame 3 (not shown).
  • Figure 6 is a front view of the left link element 14, showing the angular or hollow cylindrical part 30 serving for the pivotal attachment at the side frame 3 (not shown), a longitudinal component having a U-shaped section 31 and a subsequent straight section 32, the latter comprising one or more holes for pivotal attachment to the cross-strut 13 (not shown).
  • the inwardly-bent section 33 having a slight S-like configuration ( Figure 5 ) cannot be discerned in the view shown in Figure 6 .
  • Figures 7 and 8 are a left side front view and a top view, respectively onto the link element 14 and the supporting structure 19 for mounting it to the upper left side frame 8 (not shown).
  • the inwardly-bent section 33 having a slight S-like configuration discussed above with respect to Figure 15 is visible.
  • Figure 9 is an exploded view of a second embodiment for a supporting structure 19 in the frame assembly of the invention.
  • this embodiment there is only one link-standoff element 34 carrying a cylindrical section 36 serving as an axle for the pivoting link element 14.
  • the cylindrical section 36 has a longer rear-to-front extension so as to traverse, when the link assembly is mounted, the entire angular part 30 of link element 14.
  • a vertically extending screw 38 is used to mount the link-standoff-element 34 to the upper side frame tube 8 (not shown).
  • the embodiment shown in Figure 9 comprises an end cap 45, which is fixed by way of a small screw 46 into a axial threading provided in the cylindrical section 36, thus permitting the pivotal attachment of the link element 14 to the supporting element 19 mounted on the side frame 3 (not shown).
  • FIG 10 is an exploded view of a third embodiment for a supporting structure 19 in the frame assembly of the invention.
  • the cylindrical section 36 is a piece that is separate from the link-standoff elements 34 and 35, contrary to the embodiments discussed above, where the cylindrical section and the standoff-elements form a single piece.
  • the rear link-standoff element 34 of this third embodiment has an annular configuration enclosing a hollow cylinder.
  • a sleeve 49 is provided in the hollow cylindrical lumen of the rear link-standoff element 34, retaining the cylindrical section 36 at an annular protrusion 48 at the rear end of the latter.
  • cylindrical section serves as an axle of the link element when mounted, extending through the annular part 30 of the link element 14 and into an annular section of the front link-standoff element 35.
  • a cap 45 is attached with an axially extending screw 46 to the front end of the cylindrical section 36, thus retaining the cylindrical section between the rear and front link-standoff elements of the supporting structure 19.
  • the second and third embodiment of the supporting structure may facilitate to some extent the attachment of the link element to the side frame 3, in particular to the upper side frame tube 8.
  • the link standoff elements 34 and 35 may be separately fixed by way of screws 38 and 39 to the upper side frame tube, the link element being attached in a subsequent step by guiding and fixing the cylindrical section 36 through the link-standoff elements and the annular part 30 of the link element.
  • all elements, that is the link-standoff elements and the link element 14 have to be fixed essentially simultaneously to the upper side frame tube 8.
  • each left and right cross strut 13, 13' independently in the form of a double or twin-tube arrangement in order to further stabilise and strengthen the overall framework.
  • An arrangement of tubular cross-bracing cross-struts in the form of a twin tube arrangement is disclosed in Figures 1-5 of US 2006/0145456 , for example. Further variations and adaptations of the teaching of the concept of the present invention can be easily envisaged by the skilled person.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Carriages For Children, Sleds, And Other Hand-Operated Vehicles (AREA)
EP07123240A 2007-12-14 2007-12-14 Zusammenklappbarer Rollstuhl mit einer Rahmenanordnung mit x-förmigen Querverstrebungen Withdrawn EP2070500A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07123240A EP2070500A1 (de) 2007-12-14 2007-12-14 Zusammenklappbarer Rollstuhl mit einer Rahmenanordnung mit x-förmigen Querverstrebungen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07123240A EP2070500A1 (de) 2007-12-14 2007-12-14 Zusammenklappbarer Rollstuhl mit einer Rahmenanordnung mit x-förmigen Querverstrebungen

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EP2070500A1 true EP2070500A1 (de) 2009-06-17

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2382954A3 (de) * 2010-04-28 2012-03-07 Sunrise Medical GmbH & Co. KG Faltrollstuhl mit Arretierung
WO2023081957A1 (en) * 2021-11-12 2023-05-19 Kylix Pty Ltd Wheelchair frame assembly

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4989890A (en) 1986-09-30 1991-02-05 Invacare Corporation Length and width adjustable wheelchair
US6050582A (en) 1997-09-25 2000-04-18 Otto Bock Orthopaedische Industrie Besitz-Und Verwaltungs- Kommanditgesellschaft Cross-strut arrangement for a folding roller-mounted chair
DE20112335U1 (de) 2001-07-26 2002-11-28 Otto Bock Healthcare Gmbh Kreuzstrebe für einen Faltrollstuhl
WO2006047343A2 (en) * 2004-10-22 2006-05-04 Sunrise Medical Hhg Inc. Foldable wheelchair and axle plate therefor
US20060145456A1 (en) 2005-01-05 2006-07-06 Munsey Douglas H Sr Foldable wheelchair with extensible link assembly and method
WO2007007811A1 (ja) * 2005-07-13 2007-01-18 Swany Corporation 折り畳みできる車椅子

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4989890A (en) 1986-09-30 1991-02-05 Invacare Corporation Length and width adjustable wheelchair
US6050582A (en) 1997-09-25 2000-04-18 Otto Bock Orthopaedische Industrie Besitz-Und Verwaltungs- Kommanditgesellschaft Cross-strut arrangement for a folding roller-mounted chair
DE20112335U1 (de) 2001-07-26 2002-11-28 Otto Bock Healthcare Gmbh Kreuzstrebe für einen Faltrollstuhl
WO2006047343A2 (en) * 2004-10-22 2006-05-04 Sunrise Medical Hhg Inc. Foldable wheelchair and axle plate therefor
US20060145456A1 (en) 2005-01-05 2006-07-06 Munsey Douglas H Sr Foldable wheelchair with extensible link assembly and method
WO2007007811A1 (ja) * 2005-07-13 2007-01-18 Swany Corporation 折り畳みできる車椅子

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2382954A3 (de) * 2010-04-28 2012-03-07 Sunrise Medical GmbH & Co. KG Faltrollstuhl mit Arretierung
WO2023081957A1 (en) * 2021-11-12 2023-05-19 Kylix Pty Ltd Wheelchair frame assembly

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