CA1293437C - Adjustable frame wheelchair - Google Patents

Adjustable frame wheelchair

Info

Publication number
CA1293437C
CA1293437C CA000580406A CA580406A CA1293437C CA 1293437 C CA1293437 C CA 1293437C CA 000580406 A CA000580406 A CA 000580406A CA 580406 A CA580406 A CA 580406A CA 1293437 C CA1293437 C CA 1293437C
Authority
CA
Canada
Prior art keywords
wheelchair
section
fasteners
means
bar
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.)
Expired - Fee Related
Application number
CA000580406A
Other languages
French (fr)
Inventor
Lawrence K. Mulholland
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.)
Mulholland Designs Inc
Original Assignee
Mulholland Designs Inc
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
Family has litigation
Priority to US109,777 priority Critical
Priority to US10977787A priority
Application filed by Mulholland Designs Inc filed Critical Mulholland Designs Inc
Application granted granted Critical
Publication of CA1293437C publication Critical patent/CA1293437C/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=22329512&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA1293437(C) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61GTRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10Parts, details or accessories
    • A61G5/1056Arrangements for adjusting the seat
    • A61G5/1059Arrangements for adjusting the seat adjusting the height of the seat
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61GTRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/08Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs foldable
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61GTRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/08Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs foldable
    • A61G5/0808Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs foldable characterised by a particular folding direction
    • A61G5/0816Chairs 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
    • A61G5/0825Chairs 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61GTRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10Parts, details or accessories
    • A61G5/1056Arrangements for adjusting the seat
    • A61G5/1062Arrangements for adjusting the seat adjusting the width of the seat
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61GTRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/006Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs convertible to stretchers or beds
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61GTRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10Parts, details or accessories
    • A61G5/1056Arrangements for adjusting the seat
    • A61G5/107Arrangements for adjusting the seat positioning the whole seat forward or rearward

Abstract

ADJUSTABLE FRAME WHEELCHAIR

ABSTRACT

A wheelchair having opposing sideframes which comprise individual frame sections which are connected by a longitudinally and angularly adjustable joint. The frame sections include a fixed base section connected to linear bar sections. The bar sections are provided with lateral slots containing slidable fasteners. Link elements having fasteners that engage the slidable fasteners join together the bar sections. The joint is movable along the bar section slots and is rotatable about the link fasteners. Similarly, adjunct wheelchair assemblies may all be adjustably connected to the slidable fasteners of selected frame bar sections. The sideframes can include side braces and may be connected by laterally adjustable spacer bars.

Description

Backqr_und of the Invention Special needs of wheelchair users dictate an unending variety of alterations to a basic wheelchair structure.
Unfortunately, virtually all improvements for making a wheelchair more adaptable are limited to just one or two components~ For example, U.S. Patent Nos. 3,815,586 and 4,073,537 describe universally adjustable body support pads. The pads are connected to a fixed non-adjustable wheelchair framework. U.S. Patent No.
4,592,570 describes a seat frame which is ad~ustably attached to a fixed main frame. The frame itself cannot be altered. U.S.
Patent No. 4,595,212 sets forth a fixed side frame having means for adjustable connection with wheel assemblles. Again, ad~ustment of the s.ldeframe is not possible.
Addlng to the difficulty of providing adjustabillty to wheelchair components, is the desire to make the chair collapsible. This entails more complicated mechanisms, more cost and more weight. It severely limits the overall adaptabllity of present day wheelchairs.
Summary of the Invention The present invention provides a wheelchair framework constructed ln part by an assembly of discrete linear frame bar sections interconneated by longitudinal and angular adjuætable joints.
The inventlon also provides a framework for a ~ wheelchair, the framework supporting a seat, baclcrest and wheels ; and characterized by: opposing sideframes each comprising at least three discrete linear frame bar sections joined together by .
.

~3~
66239-1~S9 longitudinal and angular adjustable joints, and a base section having an elonyated part and a leg part connected to at least one of said frame bar sections.
The invention further provides a wheelchair having a seat, backrest and wheels, and characterized by: opposing adjustable sideframes supporting said seatt backrest and wheels, each sideframe comprising a base section having an elongated part with an outwardly extending leg part; and frame bars adjustably connected to each other by link means and to said parts to form a support structure, said frame bars having slots which contain slidable bar fasteners.
The inventlon additionally provides a wheelchair haviny a seat, backrest anA wheels supported by a framework, and characterized by, opposing spaced-apart sideframes constructed of a base section and frame bar sectlons, said sections assembled to form at least a three-cornered structure having a fi~ed angular corner with at least two angularly adjustable corners and including at least three longitudinally adjustable sides.
A wheelchair is disclosed haviny a framework comprising opposing sldeframe structures which can be geometrically varied as desired. The sideframes may be adjustably spaced-apart by a folding assembly. The sideframes comprise indlvidual frame sections having track means that is utilized in forming a wide variety of structural and supplemental connections. Link and attachment means are used to adjustably interconnect the frame ; sections to create a stable liyhtweight framework.

la -2~ 7 1 BL-ieE DeSCri~iOn OE the Dra~ings r~ iCJ. 1 iS a perspective view of a wheelcllai.r construct-ed in accordance with tl-le present invention with the seat, backrest and drive wheels shown in phantom.
~ iy. 2 is a side elevational view OE the whealchair shown in Fiy. 1.
Fig. 3 is a Eront elevational view taken along lines 3-3 oE Fig. 2.
10Fig. 9 is an enlaryed fraymentary cross-sectional view taken alony lines ~-~ of F:ig. 2.
Fiy. 5 is an enlarged Eraymentary cross-sectional view ta~cen along lines 5-5 OE Fig. 2.
Fig. 6 :is an enlarcJed Eraqmerl~ary cross-sectional view talcen aloncJ lilles G-G oE Fig. 2.
Fig. 7 i9 an enlaryed fraymelltary cross-sectional view takell along lines 7-7 oE Y:iy. 2.
Fig. ~ is an enlarged Eraymentary cross-sectional view ta]~en alony lines 8-~ oE Fig. 2.
20Fig. 9 is an elllaryed EracJmentary cross-sectional view taken along lines 9-9 oE Fig. 2.
Fig. 10 is an enlarged ~raymentary cross-sectional view taken along lines 10-10 oE Fig. 2.
Fig. 11 is an enlarged fraymen~ary cross-sectional view 25takerl alony lines 11-11 oE Fiy. 2.
Fig. 12 is a si.de elevational view showiny the side-Erame oE Fiy. 1 without auxili.ary attachmerlts.
r~ ig . 13 is a side elevational view showing the side-~rame oE Fiy. 12 :Ln a diEEerent conEiyuration and without ~he lower Erame~ sec~ion.
Fic~ is a s:ide eleva~ional view showing the side-Er. ame o I:iy. 13 :in an operl conEiyura~ion.
.

39~3~

1 i~escript:i.oll o.~ tlle Preferred Embodiments With re~erence to Fi~s. 1-3 of the drawings, a.compre-hensive wheelcllair design is shown incorporating the unique features of t~le present invention. Tle basic wheelchair ~ranlework comprises two ~enerally parallel spaced-apart side~ranles 12,1~ wllich are usually configured to be mirror-images oE eacll otller. Altllougll the sideframPs may be fixed in a spaced-apart relations]lip by conventional cross-pieces (not s~lown), tlley are preferably movable together by a folding assembly 16.
With part:icular reEerence to Figs. 12-lq, each s:ide-fral~e colllprises a base SeCti.OIl 20 alld at least three dis-crete ~rame ba.r secti.olls showll as upriyllt section 21, upper sect:ion 22 and frollt SeCtiOIl 23. '~'lle bar sec~iolls consist oE linear structural elemellts pre~erably o~ lightweigllt extruded alwllirlulll, aluminulll alloy or composite plastic.
Each section includes a ~rac]cllleans whicll, as shown, com-prises an undercu~ slo~ 2~ extending laterally along at least one, and preEerably two op~osing bar section sides.
Most conveniently, tlle slots extend throughout the lenytll o~ -the inller Eace 3~ and outer face 39 o~ each bar sect:ion. Each slo-~ has a cross-sectional shape correspond-ing to tlle outline oE a sl:idable ~astener 25 which is re-tained tllere:Ln. ~s best sllowll in Figs. ~-~, the slots have a 'r-shaped cross-section and tlle slidable fasteners ColnpriSe a convelltional nut having a tllreaded opening accessible tllrou~ll said slot.
~s wi].l be llere:i.llaEter apparent, tlle number o~ slidable Easteners contalned :in eacll track lnealls will be dicta~ed by bar sec~ion connectiolls and tlle requiremerlts of supplemen-tal en~acJe~nellt means. I~urther, i-t will be appreciated ~hat -traclc means may include slo~ted s~rips or sliding bolt means and tlle like, secured to one or more oE Wle bar section ~aces.

- -9~ 3~7 1 Base sec t:ion 20 comprises an elongated part 28 secured to a transversly extending leg part 29. ~ach part has an outer end tllat includes attachlllellt means for cor~nection with a frame bar section. q~lle attaclllllent means comprises an ou-ter bar opening 30 at tlle outer end o~ elongated part 28 including upper openi}ly 31 and lower opening 32 at the op-posing ends oE leg part 29. ~n end of a frame bar section is :inserted :into a selected opening and adjusted longitudin-ally as des:ired. Ind fastel-ters 33 extend transversly tllrouclll tlle outer elld ~al]s ancl engage correspondirlg fasten-ers 25 :in tlle bar sec~ion slo ~s ~o secure the bar sections in place.
PreEerably, tlle base sectioll comprises straight hollow structul-al par~s hav:illg luaclrilateral cross-sections corres-ponding to, and sl:Lglltly .l.arger ~ha~ he quadrilateralcross-sec~ional ~sllape oE tlle Eralne bar sections. In this way, ~lle bar SeC~iO~lS carl ~elescope into ~he base section openinys and be readily adjusted longitudinally. Xt is also preEerred to have leg part 29 extend about perpendicularly across tlle back end of Lhe elongated part. In this manner, a Eixed angular corner A will be formed to provide a strong Eoundation for tlle overall sidefralne s~ructure.
In the Figs. 1-12 em~odinlell~ of the sideframes, upriyht sectioll 21 e~tends upwardly from opening 31 and a lower bar sectloll 2G exten~.s downwardly Erom the lower bar openiny 32. r~ e 1ollgitud:irlal ax:is of ~oth sections and the leg part àre coextellsive Eormirlg a straight bac~cside to the sideframe.
Note tllat tlle upr:igllt and lo~er sections llave identical cross-sect:ional shapes and, in Eact, the lower sec~ion 26 Illay simply be a contillua-tion of upright section 21 that extends througll lecl part 29. Be aware also that use of the lower section is optional and it functions primarily to secuL-e tlle lower end oE a brace means in a manner to be hereinafter descr:ibed.

-1~39~3~

1 'relescop~ g out Erom bar opening 30 is optional hottom frame bar sec~i.on 27. T21i.S bar sect.ion serves as a linear-ly adjustable ex~ension o~ elongated part 28. Xts' const-ruction is -the same as the lower and front bar sections.
It includes slots 2~ and slidable fasteners 25 which serve to adjustably secure it ~o opening 30 with end fasteners 33.
The outer end of the bottom section is joined t~ front section 23 by a lin]c means 35. ~ltllough ~arious types of ~I brackets, yoke bars, clalllps and braces could be used for tlle link mealls, tlle preferred mealls is sllown as connector elements 36 witll lin]s ~asteners 37. The connector elements are Elat yellel-ally rec~ançJular p~.ates llaving spaced-apart or:i~i.ces ~lro-lc3ll wllicll tlle :L:ink Easteners extend. The link Eastenel.s preEerably colllpr:ise bolts whicl~ are tllreaded to en~acle tlle EeJIlale~ r.eads of ~lle sli.dable Easteners. Of course, other types of lirl]c Easteners could be used as dicta~ed by tlle particular link Ineans and track means being utilized sucll that the invelltion sllould not be limited by any spec:i~ic fasteninc3 systeJn.
rrlle link fasteller orifices are arranged to include at least two at a securement end portion oE each connector ele-mellt and one at an OppOSillCJ pivot end portion thereof. As so arranc~ed, l;.nk fas~erlel.s extendiny tllrouyh the securement end oriEices into engac3elnellt with tlle respective slidable Easterlers, w:i.ll serve maillly to firmly ix the element to tlle elld of a bar section. Ilowever, -~lle lin~ fastener ex~end-ing through tlle pivot elld orlEice into ellgagement with a slidable Eastt~rler on tlle adjacent connecting bar section9 will func~ioll as a pi.vot ullt:i.l t:i.glltened. Thus, an angular-ly acljustable joint is Eornlecl between the connecting barscctiolls. ~`urtller, the joint will be lonyitudinally acljust-able as a result of ~he slidable ~astener on tlle adjacent bar sec~iorl. Still Eur-ther, ~lle connector elements can be reversed Eor allow:incJ ei~ller bar section tv be pivotable.

~2~3~3~7 -G-1 Witll reference back to tlle connection of bottom section 27 to Eront sec-tion 23, a connector element is secured ~o tlle bottom sec~ion outer end with -two securement end link fasteners 37. ~ pivot end ~astener 37 extends through the pivot end orifice and enyayes a slide fastener from front section 23. Before the asteners are tightened, the angle B
between the bottom and frollt sections can be varied as desir-ed. ~lso, the front section can be moved lonyitudinally relative to tlle bottom section ou-ter end. Clearly, this aïlows ~Ol- unlimited variety in siæe and yeometric arrange-ment oE eacll sidefranle st~^ucture. ~urther, no-te that to strellgtllell tlle jo:ints, the linlc means may be used, as shown, on botll the inller and o-lter bar .section faces.
~tl a s:imilar Easll:ion, ancJul~r ancl longitudinal adjust-able link ~astener jOilltS call be Eormed with upper section 22 at the upper ends oE front section 23 and upright section 21. ~s sllowtl~ the securemellt portion of each colmector ele-nent is secured to the bar sectioll upper ends. The pivot link Eastellers 37 engaye respective slidable fasteners at OppOS:illy ends of ~he upper bar section. Angle C bet~
ween the Eront and upper bar sections and anyle D between tlle upriyll-t and upper bar sectiolls can be varied in the same mallller as anyle B. ~11 three angles will also vary in accor.clallce w:itll tlle des:ired spaciny between joints on the upper section and Eront section and, per the amount the bottom section and ul~right soctions extend Erom the base section parts.
ln tlle Fiy. 13 embodilllerlt~ lower section 26 and bo~-tom sectioll 27 are omit-ted. trlle frollt sec-tion 23 is rotat-ed :illwal-dly formincJ an acute angle C and is attached to the elonyatecl part 2~. ~s Sl10WII, tlle securelnent portion of the conncctor eleinents are Eixed to the outer end o~
part 23 and to the upper end oE frorlt section 23~ This permits securement anywllere alony tlle longitudinal extent ~39~3'7 1 oE tlle rrollk sect:ion. 'l'lle sideErame configuration of Fig.
13 may be appLopriake where leg suppoxk is not required or where obskruckions a~ khe wheelc]lair fronk must be mini-mized for desk or counker work.
F:ig. 1~ illuskrakes khe basic s:;deframe construction oE Fiq. 13 :in an open configuration. ~lere, the ~ront sec~
~ion incl:ines outwardly frorn iks' upper end forming an obtuse angle C wikhout connection to elongated part 28.
'lhis eltlbodilllellk prov:ide~s an ul~ra lighkweiyh-k structure suitable for use by cllildren or in spor~ applications.
I t should be noted kllat upper bar sections 22 have a ~reater cross-sec~ional arca ~llan khe ~rollt, boktom, up-ri~llt arld low~r bar sectioll~ whicll, otherwise pre~erably have idenkical cross-scc tiOllS . rrlle increased area allows for klle addikion oE a seak keyway 3~ on inner faces 3~.
rl'lle sea~ ]ceyway ex~ends tllrouyilouk the length oE ~he upper bar section and includes an enlarged inner area ~4.
qihe enlaryed area provides a means for retaining the e~-panded side edges ~7 oE seak 85.
Wikh refel-ence ko ~iys. 5 and G, seat ~5 prefexably comprises a durable pliable makerial khat spans khe area between opposillg uppel- bar sections. ~ sea-k engagemen-t means is provided whereby klle makerial is folded 130 to ~orm khe oppos:ing edyes ~7,87 and, rekainer rods 86 axe inseL^ked bekween khe Eolds ko expand khe edges. The edyes are khen gu:ided simul~aneous]y inko respec~ive open ends oE klie seak keyways on each upper bar section. Free ends 0~ tlle edCJL' folds ~no~ sho~ll) may be secured by hernrning or be drawn kogekher by lacing or khe like.
Since khe seak ma-terial is pliable, SUCil as with canvas, leakl~er or reinforced Nylon Eabric, it will flex and crease along iks' midportion when khe sideframes are drawn kogekher inko a wheelcllair closed posikion. It will be appreciaked, however, ~`hak if the wheelchair is non-collapsing, a rigid seat with engagemenk edges could be 3~3~ ~

1 used in place o~ tlle pliable seat material.
For heavy du-ty wheelcllair applications, it may be desirable t:o strenythen tlle sideErame structures with brace means ~0 as shown in -the Fiys. 1-12 embodiment. The brace means may comprise an elongated member that connects upper section 22 with base section 20 or lower section 26.
Most basically, it may simply consist oE a shaft conven-tionally secured to the aEoresaid sections. ~owever, it is preEerahlt ti~at the brace means include means to accomo-date tlle variable geometry oE the sideErame. To this end,un:iversal joint n~eans are used to connect -the brace to the frame SCCtiOIIS at vary:iny ant3ular adjustments. Longitud-i.llal adjustlnellt nlt3alls may ~lso be usecd to vary the brace lellt~tll ancl Eacilitate attacl~mell~ alont3 tlle lellgtll of a Erame bal section.
With part:icular reEerence to Figs. 2, 3, 6, 8 and 11, the brace mealls includes an elongated llollow brace member 91 llaVillg OppOSillCJ upper and lower open ends. Tl~e lower end is provided Wi~il a stationary plug 42 which is secured therein by pin 43. ~t-taclled -~o tl)e outer end of the plug i9 a lower universal jOill~ assembly 41. This includes a ball Eastener ~5 havillcl a ball end and a shaEt end which is threadably engagtd to the pluy end. Surrounding the ball end and Eorm:ing a universal join~ tllerewith is annular 2~5 jo.int ~asteller ~6. rhe jOillt ~as~ener includes a threaded portiol-l ~llat extends through base section oriEices and engages correspondiny threads in a lower.bar section slid-able fastelltr. ~ set nut ancl washer assembly 97 inhibits loosenillg oE the Eas-teners.
rhe upper open end oE brace member 91 contains lon-g:itudinal ad jUStlllellt nlt'anS ~ i.Cll, as shown, comprises sliding sllaEt 50. l`lle .shaEt i.ncludes oriEices 51 that are~
axially spaced-apart and correspond to brace melnber oriEices 52. ~ releasal~le pin 53 ent:~ages selected aligned oriEices 3~37 (~ -l oE tlle shaEt and brace melnber in accordance with the desired axial e~tent oE tlle plug (and overall brace length).
]:n tl~e same malln~r as with stationary plug 44, an upper universal jc>int assembly 5~ is attached to the end of slid-iny sllaEt 50. 'l`he uppeL- assembly includes a ball fastener 45 secured to the end oE shaft 50. ~ joint Eas-tener 46 Eorms a universal join t with the ball fastener. However, tlle tllr~aded end oE t}le joint Eastener is secured to a joint block 5G. rllle bloc)~ ~acilitates a strony connection wi-tll upper sectiorl 22 and il~cludes upper fasteners 57. The up~er Easteners engage upper sect:i.on slidable ~asteners to s(?c~lre ~lle upper end o.E tlle brace means to -tlle desired pO~:i.t:i.OII aloncJ ~lle Ipper secl::ioll slo~ 24.
Ln 50~l1e W]leelCIlair applical::ions, il: may be desirable to move tlle upper asselllb].y Eorward. ~lternately, tlle sid~Erame lleigllt or width may be increased which, in turn, al-ters tlle variable corner angles B, C and D. In all of tlle above cases, simple adjustment of the brace means length wi.ll be all ~lla-~ is nceded Eor di.sposing -tl~e brace means in tlle IllOS~ suitable aliglllllent. 'l`llis is because -tlle universal jOill-t connecti.ons perlllit automatic angular movement at the point oE connection. Consequeltly, tlle s.ideframe of the inVelltiOll :iS provided W:itll an eEEective strengthening means WhiCIl does not at all detrac~ Erom the sideErame's ability to change conEiguratiorl.
Tlle Eolding assembly lG of tlle invention is most con-veniently attaclled to opposing sideErames via the above-descrlbed brace means. 'l'hiS eliminates additional multiple collnec~i.olls to ~lle appropr:ia~e Erame sections, saves cost, mirlilllizes we:i.ght and prevents in~erEerellce with sideErame adjustability. ~rhe assembly includes at least one pair of llinged spacer bars having lateral adjustment means ~or varyi.ng tlle dis~ance betweell siclefrallles.
With reEerence -to Figs. 1-3, 10 and 11, an illustrative Eolding asselnb].y is SllOwll comprising a pair of upper spacer 3~3~

1 bars 60,61 and lower spacer bars 62,63. Each pair includes overlapping inller erld porti.ons haviny aligned openings through which a pivot sha~-~ G~ extends. The shaft is secur-ed hy nut G5. The outer ends oE each bax are secured to respectlve opposiny brace melllbers 41. The bar connections to each brace member pre~erably occur adjacent to the ends oE the !nell~ber. In ~h:is way, grea~er leverage occurs to pivot the asselnbly and move the sideframes in and out.
Also, as a result of ~he bars beiny connected at spaced-apart locations on -the brace Illember, a stronger more stable alignlnent occurs between tlle opposiny sideErames.
~ he pivoL sha~ Opell:illCJS 6G are located at the inner elld oE ou~er ba.rs G0,G2 ancl a~; a loca~ion inwardly oEfset Erom tl~e ellcl o~ :irlner bars 61,G3. l`he o~set port:ions o~
~he inrler l~ars Eorln :loe]c.illg arllls G~. rrhe arms swing beneath overlapping :inner end por~:iolls oE outer bars 60,6~ when ~he bars are i.n straight alignmellt corresponding to a wheel-chair opell pOSitiOII To secure the bars in straight align-men~ ~lle loc]~ing arnls are provided with a lock pin 67 wllicll is bi.ased outwardly by spring 71 in~o corresponding lock open:inys 72 on the inner faces of outer bars 60,62.
Iock riny 70 i.s pulled to withdraw the lock pin and permit the bars to pivot toward eacll o~her. This action results in ~he sideErames being drawn towarcl each other and dis-poses ~he wlleelchair :in a closed inopera~ive position.
Tlle Eolding assembly lateral adjustment means comprisescorresponding openillgs 66 wh:ich are spaced-apart at pre-determ:ined locat:ions along -the length of each bar. The desired spacincJ betweell sideframes can thereby be varied by insertillg p:ivot shaEt 64 tllrough openirlys aligned in cor-responderlce to the desired spacing. In such case, the an~oullt o~ bar overlap will vary accordingly. Tllerefore, equally spaced-apart lock openings will be required to allow en~ry o~ tlle lock pin to secure ~lle bars in straigllt align-mell~.

~ \
39~37 ~ l o enllallce la ~eral s ~abil:i.ty of the wheelchair when inan open pos:i tiOII, tlle foldincJ assembly can include strut means ~o interconllec~ a spacer bar. -to an opposing sideframe In F:iys. 1-3 and 10, crossing stru-t members 75,76 are shown 5 connecl :ing upper spacer bars with respecti.ve sideframe base sec~ions. Ball joint means are usecl for end connec-tions -to allow unrestric ted angular movelilen-t oE the s tru-t members wi. th tlle spacer bars .
Wi-(~ll par~icular reEerenc~ ~o ~:igs . 3 ,10 ancl ll, the 10 upper end oE s tru ~ member 75 is conllected to upper spacer bar Gl by uuper ball jo:in~ 111eanS 77. 'l'lle ball joint means illcludes a round lleacl and ball as~ener 78 that threadably ellcJacl~s s~rul; ope~l:LIlcl 7'~) of I:]le spacer bar. I3all ring 30 con~orma~.ly erlgacJe.C~ tl~e rouncl head and includes a ring 15 ~as ~ener ~:l tlla 1~ ex~ellds axially by threaded engagement in-to ~he ou ter end oE the s ~:ru t nlelllber .
'l`lle lower end oE s tru ~ rnember 75 is shown as connected wii ll the outer end oE elongated part 28 on -the sideframe wllicll is opposi~e oE spacer bar Gl ~::E desired, l:he lower 20 connecl:ic)n could be I:o l:he adjacellt botl:oM section 27 In ~lle lower conllection, ~he ball jOillt IlleanS iS the same as in ~he upper conne~cl:ion. Ilowever, ball fastener 78 engages a sl:rul: bloc]c ~2. 'l'l-~e st:rut block, in turn, includes strut fasteners ~3 whicll engaye l:llCe slidable fasl:eners eontained 25 in bol~l:om section 27.
Use oE ~he s ~ru l: bloclc provides a s ~ronger connection and allows movelllent oE the lower connection onto and along the bol ~om Eranle sec~ion. In l:lliS re~ard, the upper spacer bal-s include addi.~.ional s~ru~ opening.s 79 and, the strut 30 nlelllbe]. lencJ :ll can be var:ied l~y roiaiion oE the threaded ring Eas teners . 1 l: w.i.ll be Eur l:her appreciated that all oE I he a)~ove discussion applies equally i o strut member 76.
q lle only excep~ion i.s ~ha t l:lle upper end of strut member 7G :is a ~ ached to spacer bar G0 and tlle lower encl is con-35 nectecd ~o part 2~ orl ~lle s:ide~rame opposi~e spacer bar 60.

3~3~

l r11e wl1eelcl1air backrest meal1s will now be described w11ic11 denlons~rates sonle o~ tlle unique advantages o~ ~he novel side~ralTIe structure. The backrest means includes a pair o~ upstanding backrest frame bars 90,9l each joined to a respective upper bar section ~2 by backrest link means. ~`he cross-sectional sllape oE the backrest frame bars and upper bar sections are substantially identical.
There~ore, the bac]~rest link means can include connector elemel1ts 36 with lin]~ Easteners 37 and pivot end ~asteners ~ s best Sl10W11 in ~`.iy9 . l and 2, connector elements3G are posi ti.oned a~ oppos~ cl sicles oE the lower end oE
~clCIl bac~cres~ ~r.~ c bal. Li111c Eas~e11ers 37 engage corre-SpOllC~ CJ gl.i.clable ~St-ller.5 cot1taincd withil1 slots 2~ ln tl1e salne Inallller as wi~l1 t11e s:ideEran~e bar sections. The pivot port:ioll o~ eac11 connector element extends beyond the end of the~ ~ackrest bar and overlies respective inner and outer faces oE the upper ~ar sec-tion. Pivot link fasteners are thel-1 used to encJage correspondi11c3 slidable fasteners in the upper bar section slots.
To strengt11e11 tl1e backrest joints, the backrest link neans n~ay .include a1l angle bar 93. l`11e upper end of each ar1clle bar is ~05i ~iol1ed to ovcrl:ie tlle upper end o~ an outer ~ace con11ector elen1el1t. :It is then secured, alony ~5 witl1 th(- col1l~ector ele1llel1t by a link fastener conunon to botll. llle ancJle bar lower end :includes a pivot fastener 37 -that enclages a correspondil1g slidable ~astener in 1-he upper bal- sect:iol1 slot. Witl1 the above arrange1nent, it can be seen t]1a-t tl1e bac]crest bars n1ay be readily mo~ed longitu-dinal.1y a1Ony the upper bar sections. rhey can also betilted as de~ired to vary anyle ~ with the upper section.
l`o provide upper backrest support, a pair o~ hinged support arnls 95,96 are used to interconnect with opposing upper portiol1s oE the backrest bars. The arms are hinged at inne-r encls ~y support p:in 97. ~r}1e arlns inclucle a lock 3~37 1 Ineaalls to releasably Inailltain an open colinear position.
I'he loclc nIealls compl^ises hoo]c 9~ at an extended portion oE
arIn 95 tha~ enyayes a hooIc pin 99 pl-ojecting from arm 96 whell the arms are in longitudinal alignment.
'i`IIe oppos:ing outer elld oE each support ann is hinged to a respec~ive arm bloc~c 101,102. Each bloc]c is provided with arm ~asLeners 103 thcl~ engacIe slidable Eas~eners in the bac~resI: ~ars. ~l~his conIlection allows adjustmen-~ and move-meIlt oE the sul~port arms up and down ~he backres~ bars.
1~ 1Il IIle sanI~ same way as with tl-e upper bar section seat Iseyways, tIIe bac]~rest bars include bac~crest I~eyways 109. A bacIc su~uolt structurc 105, sIIo~ll in uhalltom in FiCJS. 1 allCI 3, inc:lucles enlal-gecl opL)osiIly sicle edyes which s~.icle in~o ~IIe ~eyw~ys a~ e open eIld oE each bacXrest bar.
'l`Ile bacIc suppor~ s~ru~ure~ can be rigid as with a non-col-lapsinc~ wIleelcIlai.r, or i~ can be Elexible such as with the seat material.
ConveIltional wheelcIIair drive wheels 107 (depicted in pllaIltolll in Figs. 1 and 3) are secured to -the elongated part 2~ oE respective oppos:iny base sections. The extended axle 109 oE eac}l drive wlleel extends -tllroug~l an opening 110 in axle plate 111 and is E:ixed thereto by axle nut 112. Plate EasteIlers 113, ~hat extend ~llrough clamp plate 114 and threadably encJage the axle plate, draw the plates against 25 OppOSillCJ sides oE the eloncJat'ed part. 'rllis clamping action secures tlle wheels in place. It also pern~its adjustmen~ oE
wheel location arlyw~leare along tllea lenyth o~ the elongated ~a r 1: .
'l~o exe~ liEy tIle advanta~es o~ the invention, i-t will be appreciated tIlat a-ttacIlIlleIlt oE adjunct wheelcllair as-sen~blies (such as EOOtL-eStS~ casters, arInrests~ handles and boc3y SUPPOL-t pads), can all be accomplished Wit}l supple-me~lltal conrlector meall.s :in conjunc~ion with the slidable EasteIlers oE the novel EranIe bar sections. Use oE the above, in cool~el.atiIlcJ relatiorl w:i~Il EraIlle bar track IIleans, allows 3~

1 all sui~plelllell~al connections ~o be semi-permanent and ad~
justable. This feature together with the ill~initely var-iable s:icleframe yeometryf makes it possible for a single wheelcllair to be adap~able ~or an endless variety of special needs alld uses.
To illustrate the abovc, note conventional caster asseln~lies 11~ w]licll are secured to the Eorwarcl portion o~
bottolll bar section 27 by a cas~er bloc]c means. Such means prov:;des a sul~pleme~ l colliecl:or junc~ion whereby a caster assembly is connected to cas~er block 115. The block, in tllrll, inclucles bloc1c ~astener~3 llG whicll engaye slidable Easteners in ~he botto~n bar section. lhe combined assem-bly can be nlovccl, as cles:irc!cl, anywllere alony lateral slot 24.
Siln:i:larly, }landles ll~ are jo:ined to the Uppel^ pOrtiOIl o~ respective baclcrest bars by supplemental means compris-illg a hallclle connector bloclc 119. l~he block is split to Erict:iollally engage -the -tubular handle base. Threaded halld:le ~astellers 1~0 ~icJh~ell ~hc bloclc to the llandle. ~`he Eas teners also erlyage correspondin~ slldable fasteners in tlle backrest bars.
:I:n a silnilaL- Easllion, supplemen~al connector means, sllowll as Eootrest bloclc 122 Wit]l Easteners 123, intercon-nect Eootres~ pla-tes 12~ to slidable fasteners in ~ront bar sect:ion 23. ~ven more simply, a toggle bra]ce assembly 126 includes brake ~astellel-~s 127 WhiCIl pivotally conneet brake arlns directly to the upper bar section via engagemellt with correspondinc3 slidabIe Easl:ellers.
:In a more de-tai.led Inanrler, arlllres~s 130 are joined by a supplelllental arlllrest moul~ing means to respective bac~c-rest bars 90,91. rlle Inoull~iny rmeans includes a split block131securillg a transverse shaEt 132. The sha~t rotatably supporl:s tlle halldle by enyagelllent with llousing 133 at the halldle base. l~ecJ 13~ extends from the slla~t into the slot and imp:inges ~he slot end to lilnit, in a predetermined marlner, up and down rotal::ion o~ the handle. The split , .~.. , ,.. ,~, . ..

bloc]c 131 :i.ncludes armrest i:asteners 135 whicll engage cor-respond:ing sl:idable Eas teners in -the bac]~rest bars .
Wll:ile the inven tion has been described Wit}l respect to preEerred emboditllen~s, :it will be apparent to those 5 skilled :in the art that various modiEications and improve-nlents may be Illade Wi thout depar-tiny Erom the scope and spirit o:~ tl~e invell~iotl. I~ccordlngly, it is to be under-s -tood t:ha t the invell tion is no t to be 1 iloi-ted by the spec:iEic illustrat:ive e~ od:i.lllell~s, but only by the scope 10 oE tlle apuended claims .

Claims (20)

1. A wheelchair having a seat, backrest and wheels, and characterized by: opposing adjustable sideframes supporting said seat, backrest and wheels, each sideframe comprising a base section having an elongated part with an outwardly extending leg part; and frame bars adjustably connected to each other by link means and to said parts to form a support structure, said frame bars having slots which contain slidable bar fasteners.
2. The wheelchair of Claim 1 wherein said link means comprises connector elements with link fasteners for engagement with said bar fasteners.
3. The wheelchair of Claim 1 including attachment means for connecting a frame bar to each base section part.
4. The wheelchair of Claim 2 wherein said frame bars have a quadrilateral cross-sectional shape and said slots extend longitudinally along opposing sides of said bars.
5. The wheelchair of any one of Claims 1 to 4 wherein said frame bars include an upright section, an upper section, a front section and a bottom section; said upright section extending upwardly from said leg part to the upper section, said upper section extending from said upright section to the front section, said front section extending from said upper section to the bottom section, said bottom section extending from said front section to the elongated part.
6. The wheelchair of Claim 5 wherein said frame bars include a lower section extending downwardly from said leg part and including a brace means connecting said upper section to said base section or said lower section.
7. The wheelchair of any one of claims 1 to 4 or 6 wherein said opposing sideframes are interconnected by a folding assembly.
8. The wheelchair of Claim 5 wherein said folding assembly includes lateral adjustment means for varying the spacing between opposing sideframes.
9. The wheelchair of Claim 7 including brace means interconnecting at least two of said frame bars on a sideframe.
10. The wheelchair of Claim 9 wherein said folding assembly includes pivoted spacer bars having opposing outer ends secured to a respective sideframe brace means.
11. The wheelchair of Claim 10 wherein said folding assembly includes strut means connecting a sideframe to a spacer bar.
12. The wheelchair of Claims 10 or 11 wherein said upper section is provided with a seat keyway and said seat has opposing side edge seat engagement means for retention by said seat keyway.
13. The wheelchair of Claims 10 or 11 wherein said backrest comprises a pair of backrest frame bars each having a backrest keyway and each being connected to a respective sideframe upper section and, a back support structure having opposing side edge back engagement means for retention by said backrest keyway.
14. The wheelchair of Claim 13 wherein said backrest frame bars include lateral slots which contain slidable bar fasteners and each of said backrest frame bars are connected to a respective sideframe upper section by backrest link means that include link fasteners that engage said slidable bar fasteners.
15. A wheelchair having a seat, backrest and wheels supported by a framework, and characterized by: opposing spaced-apart sideframes constructed of a base section and frame bar sections, said sections assembled to form at least a three-cornered structure having a fixed angular corner with at least two angularly adjustable corners and including at least three longitudinally adjustable sides.
16. A framework for a wheelchair, the framework supporting a seat, backrest and wheels and characterized by: opposing sideframes each comprising at least three discrete linear frame bar sections joined together by longitudinal and angular adjustable joints, and a base section having an elongated part and a leg part connected to at least one of said frame bar sections.
17. The framework for a wheelchair of Claim 16 wherein said frame bar sections include track means having slidable fasteners;
and, link means jointing together said frame bar sections having link fasteners for engagement with said slidable fastener
18. A wheelchair framework constructed in part by an assembly of discrete linear frame bar sections interconnected by longitudinal and angular adjustable joints.
19. The framework of Claim 18 wherein said frame bar sections include track means having slidable fasteners.
20. The framework of Claim 19 wherein said joints are formed with link means having link fasteners that engage corresponding slidable fasteners in said track means.
CA000580406A 1987-10-19 1988-10-18 Adjustable frame wheelchair Expired - Fee Related CA1293437C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US109,777 1980-01-07
US10977787A true 1987-10-19 1987-10-19

Publications (1)

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CA1293437C true CA1293437C (en) 1991-12-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA000580406A Expired - Fee Related CA1293437C (en) 1987-10-19 1988-10-18 Adjustable frame wheelchair

Country Status (4)

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EP (1) EP0312969B1 (en)
JP (1) JPH01207062A (en)
CA (1) CA1293437C (en)
DE (2) DE3879864D1 (en)

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Also Published As

Publication number Publication date
JPH01207062A (en) 1989-08-21
EP0312969A3 (en) 1989-10-25
DE3879864D1 (en) 1993-05-06
DE3879864T2 (en) 1993-08-26
EP0312969B1 (en) 1993-03-31
EP0312969A2 (en) 1989-04-26

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