CA1198232A - Back rest - Google Patents
Back restInfo
- Publication number
- CA1198232A CA1198232A CA000439804A CA439804A CA1198232A CA 1198232 A CA1198232 A CA 1198232A CA 000439804 A CA000439804 A CA 000439804A CA 439804 A CA439804 A CA 439804A CA 1198232 A CA1198232 A CA 1198232A
- Authority
- CA
- Canada
- Prior art keywords
- backrest
- shell frame
- section
- shallow
- medial
- 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
Links
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/36—Support for the head or the back
- A47C7/40—Support for the head or the back for the back
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/36—Support for the head or the back
- A47C7/40—Support for the head or the back for the back
- A47C7/42—Support for the head or the back for the back of detachable or loose type
Landscapes
- Chair Legs, Seat Parts, And Backrests (AREA)
Abstract
BACKREST
ABSTRACT OF THE DISCLOSURE
A backrest comprising a moulded shell support having in medial longitudinal section a shallow S shape and in lateral section a shallow concave shape. The support is upholstered by a foam layer and a fabric cover stretched between the lateral margins to assist in delocalizing pressures on the back of a user and assist in ventilating the backrest.
ABSTRACT OF THE DISCLOSURE
A backrest comprising a moulded shell support having in medial longitudinal section a shallow S shape and in lateral section a shallow concave shape. The support is upholstered by a foam layer and a fabric cover stretched between the lateral margins to assist in delocalizing pressures on the back of a user and assist in ventilating the backrest.
Description
3~2 ~ 1 ~ 1403 P/3 B~fK~EST
FIELD OF INVENTION
This in~rention relates to backrests or suppvrts. Whilst it is particularly described in relation to light, portable backrests it is not necessarily restricted thereto.
B~CKGR0UND OF INVENTION
~ . .
Backache has keen aptly termed a univers~al affliction, it bein~ estimated that sc~e 80 percent of the woI-ldsl population experiences back problems at some period of their lives. In Nbrth kmerica some 3 to 4 percent of the populace is said to ke afflicted to an extent to be considered at least partially disabled.
Conventional treatments include the use of orthopedic braces to hold the kack immobilel to a greater or lesser extent for prolonged periods of time. Such braces vary from plaster o~ Paris body casts, to hard leather devices which are strapped to t}le body, but to which -the body conforms rather than the support conform mg to the body unless custom fitted. Whilst is is considered to be preferable that a kack support be structured to the bady measurements of individual users, this is not prackical m relatively low cost items,
FIELD OF INVENTION
This in~rention relates to backrests or suppvrts. Whilst it is particularly described in relation to light, portable backrests it is not necessarily restricted thereto.
B~CKGR0UND OF INVENTION
~ . .
Backache has keen aptly termed a univers~al affliction, it bein~ estimated that sc~e 80 percent of the woI-ldsl population experiences back problems at some period of their lives. In Nbrth kmerica some 3 to 4 percent of the populace is said to ke afflicted to an extent to be considered at least partially disabled.
Conventional treatments include the use of orthopedic braces to hold the kack immobilel to a greater or lesser extent for prolonged periods of time. Such braces vary from plaster o~ Paris body casts, to hard leather devices which are strapped to t}le body, but to which -the body conforms rather than the support conform mg to the body unless custom fitted. Whilst is is considered to be preferable that a kack support be structured to the bady measurements of individual users, this is not prackical m relatively low cost items,
2~ In the case of chronic suffers of kack problems correct ,~
3~
posture can often offer relief. Uhfortunately most ch~ir bac~s do not provide proper support, particularly in the lu~ar region of the spine.
It is then, an object of this invention to p~-ovide a backl^est which aids in providing good posture and supEc)rt for the back.
It is a further object of the invention to provid~ a light, portable backrest of the above type.
It is another object of the invention to provide a backrest which has a resilience in lateral direction to conform to various body shapes/ but which is relatively stiff in longitudinal directions so as to support the back.
It is yet another object of the invention to provide a backrest having adequate stiffness but which is ventilated to enhance user comfort.
SUMM~F~V OF INVENTION
. . _ In accordance with one aspect of -the invention, a backrest comprises a shell support havin~ in mediaL longitudinal section a shaLlow S shape, and in later~L section a shal:Low concave shape, the sheLl support being relatively stiff and unyielding in medial longitudL~iL portions and relatively resilient in transverse medi~L portions when subject t~ norn~Lly applied back pre!ssure, so as to tend to conform to the girth of a user.
Preferably the shell support comprises a central portion having oppos~d w mg portions projecting therefrom at each side thereof in a unitary structure. Desirably the thickness of the shell support reduces progressively in passing frGm the centr~L
3~
- 3 - ]403 P/3 portion to the wing portions, so as to increase the lateral resilience of the shell supportr although such resilience must always be commensurate with the wing portions having adequate stiffness to provide support to the back of a user of the backrest.
It is additionally preferred that the ~edial longitl~Lnal p3rtions of the shell support ke proportioned 50 that the area of inflexion of the S shape locates at about mid height o-f such p~rtions.
In accordance with another aspect of the invention the shell support is provided with a plurality of openlngs therein to permit the escape of heat therethrough. Desirably a pair of laterally e,longated window openings are pro~ided for this purpose, these w mdow openings further serving to increase the resiliency of the shell support in lateral planes. These laterally elongated window openings intersect the longitudinc~l medial section of the shell support akove and below the area of infle~ion xespecti~ely;
t~e backrest is normally used wh~rein the window openings o~erlay mid sections of the thoracic vertebrae and mid sections of the lumkar vertebrae respectively. As a corollary, non-wi ~ owed sections of the shell support locate to support upper and lo~r portions of the thoracic vertebxae clnd lumbar vertebrae respectively.
In accordance with yet another aspect of the invention the kack support :is up,holstered on the concave side thereof with a soft, resilie,nt sponge material, this in turn being covered with a cloth oover which is prefe,rably stretchable in a lateral direction, the cloth cover sE~mning between the laterally o~posed margins of 323~'' _ ~ _ 1403 P/3 the back suppor~ ullder tension so as to be unsupported in madi,~l portions thereof and ~reate an air pocket bet~een the cover cl~1 support, which air pocket is collapsible to expel air therefran and ventilate the backrest.
The above objects and asp~cts of my invention will made more clear, and still others and the advantages thereof will become e~vident from the following disclosure of a preferred embodiment of the invention, taken in conjunction with the acccmpanying drawings.
BRIEF DESCRIPTION OF DRAWINGS
.
FIGo 1 ~ shows the backrest of the invention in a frontal perspective view;
FIG~ 2 - shows the backrest of FIG. l rotated through akout 180 about its longitudinal axis;
FIG~ 3 - shows an interior shell frame of the backrest in frontal perspective view;
FIG~ 4 ~ is similar to FIG~ 3, but shows an alternative emkodiment of the shell frame;
FIG. 5 - is similar to FIG. 2, but shows the upholstexy partially cut away to reveal internal detail;
FIG~ 6 ~ is a view partly in section along 6-6 of FIG~
5;
~5 FIG~ 7 ~ is a sectional view along 7-7 of FIG~ 6, and FIG~ 8 ~ sh~ws Ln side elevation a back support in use.
~9~
DESCRIPTION OF P~EFERR~D EMBODDMENT
__ _ Referring -to the drawings in detail~ a backrest is indicated generally therein by the numeral 10. Backrest 10 comprises a shell support 12 h~ving a central portion 14 and opposed wing portions 16 which project frcm each side thereof~
the wing portions increasing generally in their lateral dimension on approach to the lower areas of the backrest. Shell support 12 is generally arcuately forme~ with a shallow concave section taken laterally, as seen in Fig. 7. In medial longitudinal section shell support 12 is a shallow S shape, best seen in Fig. 6, corresponding generally to the normal curvature of the spine of a person in an erect position taken betwee~ the lower lumbar ~ertebrae and about the fourth upper most thoracic vertebrae, the area of infle~i~n 18 of the S shape thereb~ locating at about mid height of central portion 14.
The sh~llow S shape of the shell support extends outwardly to the lateral margLns 20 of the shell support, as seen best in Fig. 3.
Shell support 12 has a pair of relatively large laterally elongated window openings 22,24 which extend from adjacent ~pposed lateral margins 20 respectively thereby forming three relatively broad horizont~lly spaced back support areas or bands 26,28,30, band 28 being generally coincident with zone of inflexion 18 at least in medial portions of the shell support.
Shell support 12 is typically moulded in a plastic material having a relatively high shear modulus,polycarbonate res~n and glass fibre reinforced thermosetting polyester resins having been found to be particularly satisfactory because of the relatively high stifEness afforded by m~derately thin sections ~a eo~
thereof. T~pically ~dial sections of shell support 12 will have a thickness of sane 3.5 to 4 mm, this decreasing by some 20 percent on approach to lateral margins 20.
Shell support 12 is upholstered with a layer of sp~ngy foam material 32 adhered to the concave side of the support, a th mner layer 34 of spongy foam material on the backside of the support completing the envelope. Preferably foam material layers 32,34 are open celled to pe~mlt the passage of air and moisture vapour therethroughO A fabric cover 36 in its turn envelopes the foam layer. Fabric cover 36 is stretched relatively tightly between the lateral margins 20 of shell support 12, to leave an air space 38 bekween the cover and foam layer 32. Fabric cover is preferably of a knitted material cut so as to be prefera!bly stretchable in the lateral direction. Cover 36 is provided with a lateral separable seam 40 joined by a Velcro fastener or the likeO
Velcro is a trade mark for a nylon material made with both a surface of tiny hooks an~ a ccmplementary surface of an adhesive pile that can be pressed together or pulled apart for easy faste~ing or unfastening.
In a further embodlment of the invention shown in Fig. 4, a shell support 112 is provided with a plurality of openings 114 the~ein distributed generally uniformly over the surface of -the support within the margins t~lereof, shell support 112 being otherwise identical to shell support 12.
Havin~ descriked the structure of backrest 10 the nkmner of use will now b~ clescribed- Backrest 10 is typically in-terposed be~-ween the back of a p~t-son and a support mg chair back 42, where the person is seated, as s~wn in Fig. 8. It will be appatent that kackresk 10 cc)uld be ~mified with the seating portion 44 of the chair, or otherwise be integratecl into the structure of the chair or indeed any other structure upon which the frame of a pexson is reposed. A~vantages of the separable 1~9~3~
- 7 - 1~03 P/3 structure reside in its portability, and also the ease of adjustment. Desirably when used ~ackrest 10 is positioned so that horizontal support areas 26,28,30 of shell support 12 support upper portions of the thoracic spine, :Lo~er portions of the lumbar 5 spine, and the vertebrae where the thoracic spine and lum~ar spine meet.
When ~ack pressure is initiaLly applied to cover 36 the cover stretches in conformity with the users' back, thereby assisting in delocalizing pressure thereon. As the pressure applied to backrest 10 increases, -the concavity of shell suppoxt 12 is proyressively decxeased; LateraL margins 20 thereby moving apart.
This movement of the lateraL m~rgins in its turn further stretches cover 36, still further assisting in the delocaLization of pressure experienced on spinaL areas of the back of a user, with somewhat increased pressuxe being experienced in the wing æ eas.
It will be appreciated that whilst foam layer 32 acts to delocalize pressure, it is of assistance in reducing relative ~v~ment between cover 36 and shell support 12 adjacent margins 20 of the shell support. Cover 36 also assists in ventilating backrest 10. m us as pressure is alternately applied to and released frcm cover 36 the volume of air space 38 will vary, with air being alternately expelled fram ~nd aspirated into the air space, air thus being caused to circulate through the cover and through the open celIed foam layers 32 and 34.
Whilst in the illustrated emkodiments presently preferred fe~atures of the invention have been put forward, it is to be understood that the invention is not li~ited to the precise forms 2~
- 8 - 1~03 P/3 illustrated, and that changes may be ~ade thereto without departing from the spirit and substance of the invention.
-
posture can often offer relief. Uhfortunately most ch~ir bac~s do not provide proper support, particularly in the lu~ar region of the spine.
It is then, an object of this invention to p~-ovide a backl^est which aids in providing good posture and supEc)rt for the back.
It is a further object of the invention to provid~ a light, portable backrest of the above type.
It is another object of the invention to provide a backrest which has a resilience in lateral direction to conform to various body shapes/ but which is relatively stiff in longitudinal directions so as to support the back.
It is yet another object of the invention to provide a backrest having adequate stiffness but which is ventilated to enhance user comfort.
SUMM~F~V OF INVENTION
. . _ In accordance with one aspect of -the invention, a backrest comprises a shell support havin~ in mediaL longitudinal section a shaLlow S shape, and in later~L section a shal:Low concave shape, the sheLl support being relatively stiff and unyielding in medial longitudL~iL portions and relatively resilient in transverse medi~L portions when subject t~ norn~Lly applied back pre!ssure, so as to tend to conform to the girth of a user.
Preferably the shell support comprises a central portion having oppos~d w mg portions projecting therefrom at each side thereof in a unitary structure. Desirably the thickness of the shell support reduces progressively in passing frGm the centr~L
3~
- 3 - ]403 P/3 portion to the wing portions, so as to increase the lateral resilience of the shell supportr although such resilience must always be commensurate with the wing portions having adequate stiffness to provide support to the back of a user of the backrest.
It is additionally preferred that the ~edial longitl~Lnal p3rtions of the shell support ke proportioned 50 that the area of inflexion of the S shape locates at about mid height o-f such p~rtions.
In accordance with another aspect of the invention the shell support is provided with a plurality of openlngs therein to permit the escape of heat therethrough. Desirably a pair of laterally e,longated window openings are pro~ided for this purpose, these w mdow openings further serving to increase the resiliency of the shell support in lateral planes. These laterally elongated window openings intersect the longitudinc~l medial section of the shell support akove and below the area of infle~ion xespecti~ely;
t~e backrest is normally used wh~rein the window openings o~erlay mid sections of the thoracic vertebrae and mid sections of the lumkar vertebrae respectively. As a corollary, non-wi ~ owed sections of the shell support locate to support upper and lo~r portions of the thoracic vertebxae clnd lumbar vertebrae respectively.
In accordance with yet another aspect of the invention the kack support :is up,holstered on the concave side thereof with a soft, resilie,nt sponge material, this in turn being covered with a cloth oover which is prefe,rably stretchable in a lateral direction, the cloth cover sE~mning between the laterally o~posed margins of 323~'' _ ~ _ 1403 P/3 the back suppor~ ullder tension so as to be unsupported in madi,~l portions thereof and ~reate an air pocket bet~een the cover cl~1 support, which air pocket is collapsible to expel air therefran and ventilate the backrest.
The above objects and asp~cts of my invention will made more clear, and still others and the advantages thereof will become e~vident from the following disclosure of a preferred embodiment of the invention, taken in conjunction with the acccmpanying drawings.
BRIEF DESCRIPTION OF DRAWINGS
.
FIGo 1 ~ shows the backrest of the invention in a frontal perspective view;
FIG~ 2 - shows the backrest of FIG. l rotated through akout 180 about its longitudinal axis;
FIG~ 3 - shows an interior shell frame of the backrest in frontal perspective view;
FIG~ 4 ~ is similar to FIG~ 3, but shows an alternative emkodiment of the shell frame;
FIG. 5 - is similar to FIG. 2, but shows the upholstexy partially cut away to reveal internal detail;
FIG~ 6 ~ is a view partly in section along 6-6 of FIG~
5;
~5 FIG~ 7 ~ is a sectional view along 7-7 of FIG~ 6, and FIG~ 8 ~ sh~ws Ln side elevation a back support in use.
~9~
DESCRIPTION OF P~EFERR~D EMBODDMENT
__ _ Referring -to the drawings in detail~ a backrest is indicated generally therein by the numeral 10. Backrest 10 comprises a shell support 12 h~ving a central portion 14 and opposed wing portions 16 which project frcm each side thereof~
the wing portions increasing generally in their lateral dimension on approach to the lower areas of the backrest. Shell support 12 is generally arcuately forme~ with a shallow concave section taken laterally, as seen in Fig. 7. In medial longitudinal section shell support 12 is a shallow S shape, best seen in Fig. 6, corresponding generally to the normal curvature of the spine of a person in an erect position taken betwee~ the lower lumbar ~ertebrae and about the fourth upper most thoracic vertebrae, the area of infle~i~n 18 of the S shape thereb~ locating at about mid height of central portion 14.
The sh~llow S shape of the shell support extends outwardly to the lateral margLns 20 of the shell support, as seen best in Fig. 3.
Shell support 12 has a pair of relatively large laterally elongated window openings 22,24 which extend from adjacent ~pposed lateral margins 20 respectively thereby forming three relatively broad horizont~lly spaced back support areas or bands 26,28,30, band 28 being generally coincident with zone of inflexion 18 at least in medial portions of the shell support.
Shell support 12 is typically moulded in a plastic material having a relatively high shear modulus,polycarbonate res~n and glass fibre reinforced thermosetting polyester resins having been found to be particularly satisfactory because of the relatively high stifEness afforded by m~derately thin sections ~a eo~
thereof. T~pically ~dial sections of shell support 12 will have a thickness of sane 3.5 to 4 mm, this decreasing by some 20 percent on approach to lateral margins 20.
Shell support 12 is upholstered with a layer of sp~ngy foam material 32 adhered to the concave side of the support, a th mner layer 34 of spongy foam material on the backside of the support completing the envelope. Preferably foam material layers 32,34 are open celled to pe~mlt the passage of air and moisture vapour therethroughO A fabric cover 36 in its turn envelopes the foam layer. Fabric cover 36 is stretched relatively tightly between the lateral margins 20 of shell support 12, to leave an air space 38 bekween the cover and foam layer 32. Fabric cover is preferably of a knitted material cut so as to be prefera!bly stretchable in the lateral direction. Cover 36 is provided with a lateral separable seam 40 joined by a Velcro fastener or the likeO
Velcro is a trade mark for a nylon material made with both a surface of tiny hooks an~ a ccmplementary surface of an adhesive pile that can be pressed together or pulled apart for easy faste~ing or unfastening.
In a further embodlment of the invention shown in Fig. 4, a shell support 112 is provided with a plurality of openings 114 the~ein distributed generally uniformly over the surface of -the support within the margins t~lereof, shell support 112 being otherwise identical to shell support 12.
Havin~ descriked the structure of backrest 10 the nkmner of use will now b~ clescribed- Backrest 10 is typically in-terposed be~-ween the back of a p~t-son and a support mg chair back 42, where the person is seated, as s~wn in Fig. 8. It will be appatent that kackresk 10 cc)uld be ~mified with the seating portion 44 of the chair, or otherwise be integratecl into the structure of the chair or indeed any other structure upon which the frame of a pexson is reposed. A~vantages of the separable 1~9~3~
- 7 - 1~03 P/3 structure reside in its portability, and also the ease of adjustment. Desirably when used ~ackrest 10 is positioned so that horizontal support areas 26,28,30 of shell support 12 support upper portions of the thoracic spine, :Lo~er portions of the lumbar 5 spine, and the vertebrae where the thoracic spine and lum~ar spine meet.
When ~ack pressure is initiaLly applied to cover 36 the cover stretches in conformity with the users' back, thereby assisting in delocalizing pressure thereon. As the pressure applied to backrest 10 increases, -the concavity of shell suppoxt 12 is proyressively decxeased; LateraL margins 20 thereby moving apart.
This movement of the lateraL m~rgins in its turn further stretches cover 36, still further assisting in the delocaLization of pressure experienced on spinaL areas of the back of a user, with somewhat increased pressuxe being experienced in the wing æ eas.
It will be appreciated that whilst foam layer 32 acts to delocalize pressure, it is of assistance in reducing relative ~v~ment between cover 36 and shell support 12 adjacent margins 20 of the shell support. Cover 36 also assists in ventilating backrest 10. m us as pressure is alternately applied to and released frcm cover 36 the volume of air space 38 will vary, with air being alternately expelled fram ~nd aspirated into the air space, air thus being caused to circulate through the cover and through the open celIed foam layers 32 and 34.
Whilst in the illustrated emkodiments presently preferred fe~atures of the invention have been put forward, it is to be understood that the invention is not li~ited to the precise forms 2~
- 8 - 1~03 P/3 illustrated, and that changes may be ~ade thereto without departing from the spirit and substance of the invention.
-
Claims (16)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A backrest comprising a shell frame having a central portion and opposed wing portions laterally projecting from said central portion, the lateral dimension of said wing portions increasing in a downward direction, said wing portions connecting only to said central portion, said central portion having in longitudinal section a lower convex section and an upper concave section with an area of inflexion therebetween, said shell frame thereby exhibiting in medial longitudinal section a shallow S form, said shell frame having in transverse section a shallow concave form, said shell frame being constructed to be relatively stiff and inflexible along said longitudinal medial section and relatively resilient in medial portions transverse thereto so as to tend to decrease the transverse concavity thereof under the influence of the weight of a user.
2. A backrest in accordance with Claim 1, wherein said shell frame is provided with a plurality of openings therethrough.
3. A backrest in accordance with Claim 2, wherein said shell frame is provided with a pair of transversely elongated openings therein, located respectively on each side of the area of inflexion of said longitudinal section.
4. A backrest in accordance with Claim 1, 2 or 3, wherein said shallow S
form continues to the lateral margins of said shell frame.
form continues to the lateral margins of said shell frame.
5. A backrest as claimed in Claim 1, 2 or 3, wherein the area of inflexion of said longitudinal section is about mid height of said shell frame.
6. A backrest as claimed in Claim 1, 2 or 3, wherein the thickness of said shell decreases by about 20% in the lateral margins thereof.
7. A backrest comprising a shell frame comprising a central portion and opposed wing portions projecting on laterally opposed sides thereof in a unitary structure, the lateral dimension of said backrest generally increasing from top to bottom, the wing portions being supported only by said central portion, said shell frame having in medial longitudinal section a shallow S form with an upper concavity and a lower convexity, and in transverse section a shallow concave form, said shell frame being constructed to be relatively stiff along said longitudinal medial section and relatively resilient in medial portions transverse thereto so as to tend to decrease the transverse concavity thereof under the influence of the weight of the user.
8. A backrest as claimed in Claim 7, wherein said shell frame member is provided with two relatively large transversely elongated openings therein, located respectively in said areas of upper concavity and lower convexity.
9. A backrest as claimed in Claim 7, wherein said shell frame is provided with a plurality of openings therethrough.
10. A backrest as claimed in Claim 7, 8 or 9, wherein said shallow 5 form continues to the lateral margins of said shell frame.
11. A backrest as claimed in Claim 7, 8 or 9, wherein said upper concavity meets said lower convexity at about the mid height of said shell frame.
12. A backrest as claimed in Claim 7, 8 or 9, wherein said shell frame is constructed from a polycarbonate resin.
13. A backrest as claimed in Claim 7, 8 or 9, wherein said shell frame is constructed from a fibre reinforced resin.
14. A backrest as claimed in Claim 7, 8 or 9, wherein said shell frame is constructed from glass fibre reinforced plastic.
15. A backrest comprising a shell frame having a central portion and laterally opposed wing portions unitarily formed therewith, the lateral width of the shell frame member being greater at the lower areas thereof than the upper areas, the central portion having in longitudinal section a shallow S shape with the upper margin thereof being forwardly directed and the lower margin rearwardly directed, the wing portions terminating in free margins at the lower extremities thereof, said shell frame in lateral section having a shallow concave section, said shell frame being constructed to be generally rigid in the medial longitudinal direction and relatively flexible in the medial transverse direction, when subject to normal loads applied thereto by a user.
16. A backrest as claimed in Claim 15, wherein said shell frame is provided with a pair of relatively large openings located respectively on each side of the mid area of said S shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000439804A CA1198232A (en) | 1983-10-26 | 1983-10-26 | Back rest |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000439804A CA1198232A (en) | 1983-10-26 | 1983-10-26 | Back rest |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000392050A Division CA1159582A (en) | 1981-12-11 | 1981-12-11 | Back rest |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1198232A true CA1198232A (en) | 1985-12-17 |
Family
ID=4126382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000439804A Expired CA1198232A (en) | 1983-10-26 | 1983-10-26 | Back rest |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1198232A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2683129A1 (en) * | 1991-10-30 | 1993-05-07 | Contencin Ginette | Support for a seated position for healthy, sick or disabled subjects |
| US5445433A (en) * | 1993-09-01 | 1995-08-29 | Medisol U.S.A. Inc. | Kit for a reclining chair-back thoracic-lumbar-sacral corrective orthosis wheelchair |
| WO2001064157A2 (en) * | 2000-02-28 | 2001-09-07 | Invacare Corporation | Multiply adjustable low back support assembly for a wheelchair |
| US8113582B2 (en) | 2008-06-12 | 2012-02-14 | Huang Chang Liu | Chair cushion |
| EP3718439A1 (en) * | 2010-04-13 | 2020-10-07 | Herman Miller, Inc. | Seating structure with a contoured flexible backrest |
-
1983
- 1983-10-26 CA CA000439804A patent/CA1198232A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2683129A1 (en) * | 1991-10-30 | 1993-05-07 | Contencin Ginette | Support for a seated position for healthy, sick or disabled subjects |
| US5445433A (en) * | 1993-09-01 | 1995-08-29 | Medisol U.S.A. Inc. | Kit for a reclining chair-back thoracic-lumbar-sacral corrective orthosis wheelchair |
| WO2001064157A2 (en) * | 2000-02-28 | 2001-09-07 | Invacare Corporation | Multiply adjustable low back support assembly for a wheelchair |
| WO2001064157A3 (en) * | 2000-02-28 | 2002-04-04 | Invacare Corp | Multiply adjustable low back support assembly for a wheelchair |
| US6460933B1 (en) | 2000-02-28 | 2002-10-08 | Invacare Corporation | Multiply adjustable low back support assembly for a wheelchair |
| US8113582B2 (en) | 2008-06-12 | 2012-02-14 | Huang Chang Liu | Chair cushion |
| EP3718439A1 (en) * | 2010-04-13 | 2020-10-07 | Herman Miller, Inc. | Seating structure with a contoured flexible backrest |
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