CA1159582A - Back rest - Google Patents
Back restInfo
- Publication number
- CA1159582A CA1159582A CA000392050A CA392050A CA1159582A CA 1159582 A CA1159582 A CA 1159582A CA 000392050 A CA000392050 A CA 000392050A CA 392050 A CA392050 A CA 392050A CA 1159582 A CA1159582 A CA 1159582A
- Authority
- CA
- Canada
- Prior art keywords
- backrest
- shell support
- cover
- lateral
- shallow
- 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
- 239000004744 fabric Substances 0.000 claims abstract description 6
- 239000006260 foam Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 9
- 239000006261 foam material Substances 0.000 claims description 5
- 239000003365 glass fiber Substances 0.000 claims description 2
- 239000012858 resilient material Substances 0.000 claims 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims 1
- 239000002991 molded plastic Substances 0.000 claims 1
- 239000012815 thermoplastic material Substances 0.000 claims 1
- 210000000115 thoracic cavity Anatomy 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 2
- 210000004705 lumbosacral region Anatomy 0.000 description 2
- 208000008035 Back Pain Diseases 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 208000019804 backache Diseases 0.000 description 1
- 230000037237 body shape Effects 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 1
- 230000001684 chronic effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- JXSJBGJIGXNWCI-UHFFFAOYSA-N diethyl 2-[(dimethoxyphosphorothioyl)thio]succinate Chemical compound CCOC(=O)CC(SP(=S)(OC)OC)C(=O)OCC JXSJBGJIGXNWCI-UHFFFAOYSA-N 0.000 description 1
- 239000011507 gypsum plaster Substances 0.000 description 1
- 101150085091 lat-2 gene Proteins 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000000399 orthopedic effect Effects 0.000 description 1
- 229940061319 ovide Drugs 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
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—Supports for the head or the back
- A47C7/40—Supports for the head or the back for the back
- A47C7/42—Supports for the head or the back for the back of detachable or loose type
- A47C7/425—Supplementary back-rests to be positioned on a back-rest or the like
-
- 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—Supports for the head or the back
- A47C7/40—Supports for the head or the back for the back
- A47C7/46—Supports for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs
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
~ ~595~2 ~ 1 ~ 1403 P/3 B~fKREST
FIELD OF INVENTION
m is invention relates to backrests or supports. Wnilst it is particularly described in relation to light, portable backrests it is not necessarily restricted thereto.
BACKGR3~ND OF INVENTION
Backache has keen aptly termed a universal affliction, it being estimated that some 80 percent of the w~rlds' population experiences b~ck problems at scme period of their lives. In North America some 3 ~o 4 percent of the populace is said to be afflicted to an extent to be considered at least partially disabled.
Conventional treatments include the use of orthopedic braces to hold the back immobile, to a greater or lesser extent for prolonged periods of time. Such braces vary from plaster of Paris body casts, to hard leather devices which are strapped to the body, but to which the body conforms rather than the support conforming to the body unless custom fitted. Whilst is is considered to be preferable that a back support be structured to the bcdy neasurements of individual users, this is not practical in relatively low oost items.
In the case of chronic suffers of back problems correct !
, , , ~ 159532
FIELD OF INVENTION
m is invention relates to backrests or supports. Wnilst it is particularly described in relation to light, portable backrests it is not necessarily restricted thereto.
BACKGR3~ND OF INVENTION
Backache has keen aptly termed a universal affliction, it being estimated that some 80 percent of the w~rlds' population experiences b~ck problems at scme period of their lives. In North America some 3 ~o 4 percent of the populace is said to be afflicted to an extent to be considered at least partially disabled.
Conventional treatments include the use of orthopedic braces to hold the back immobile, to a greater or lesser extent for prolonged periods of time. Such braces vary from plaster of Paris body casts, to hard leather devices which are strapped to the body, but to which the body conforms rather than the support conforming to the body unless custom fitted. Whilst is is considered to be preferable that a back support be structured to the bcdy neasurements of individual users, this is not practical in relatively low oost items.
In the case of chronic suffers of back problems correct !
, , , ~ 159532
- 2 1403 P/3 posture can often offer relief. Unfortunately most chair backs do not prov;~e proper support, particularly in the lumbar region of the spine.
It is then, an object of this invention to provide a backrest which aids in providing good posture and support for the back.
It is a further object of the invention to provide a light, portable kackrest of the above type.
It is another object of the invention to provide a kackrest which has a resilience in lateral direction to ~onform 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 p~ovide a backrest having adequate stiffness but which is ventilated to enhance user comfort.
SUMMARY OF INVENTION
In accordance with one aspect of the invention, a backrest ccmprises a shell support having in medial longitudinal section a shallow S shape, and in lateral section a shallow concave shape, the shell support being relat~^vely stiff and unyielding in medial longitudinal portions and relatively resilient in transverse medial portions when subject to normally applied kack pressure, ; so as to tend to con~orm to the girth of a user.
Preferably the shell support ocmprises a central portion having opposed wing portions projecting there~ram at each side thereof in a unitary structure. Desirably the thickness of the shell support reduces progressively in passing from the central ~, 1 ~ 5g58~
_ 3 - 1403 P/3 portion to the wing portions, so as to increase the lateral resilience of the shell support, 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 medial longitudinal portions of the shell support be proportioned so that the are~
of inflexion of the S shape locates at a~out mid height of such portions.
In accordance with another aspect of the invention the shell support is provided with a plurality of openings therein to permit the escape of heat therethrough. Desirably a pair of laterally elongated window openings are provided for this purpose, these window openings further serving to increase the resiliency of the shell support in lateral planes~ m ese laterally elongated wnndow openings intersect the longitu~inal medial section of the shell support ab~ve and below the area of inflexion respectively;
the backrest is normally used wherein the wlndow openings o~erlay mid sections of the thoracic vertebrae and mid sections of the lumbar vertebrae respectively. As a corollary, non-windowed sections of the shell support locate to support upper and lower portions of the thoracic vertebrae and lumbar vertebrae respectively.
In accordance with yet another aspect of the invention the back suppo~t is upholstered on the concave side thereof with a soft, resilient sponge material, this in turn being covered with a cloth cover which is preferably stretchable in a lateral direction, the cloth cover spanning between the laterally opp3sed margins of ~ ~ 595g2 - 4 - 1~03 P/3 the back s ~ ort under tension so as to be unsupported in medial portions thereof and ~reate an A;r pccket between the cover and support, ~hich air pocket is c~llapsible to expel air therefrDm and ventilate the backrest.
The above objects and aspects of my invention will ~e made m~re clear, and still others and the ahvantages thereof will become evident fn3n the following di æ losure of a preferred embodiment of the invention, taken in oDnjunction with the acoompanying drawings.
BRIEF DESCRIPTICN OF DR~WING5 FIG. 1 - show~ the backrest of the invention in a front~l perspective view;
FIG. 2 sh~ws the backrest of FIG. 1 rotated through about 180 abDut its longitudinal axis; ^' FIG. 3 - shDws an interior shell frame of the backrest in fr~ntal perspective view;
FIG. 4 - is similar to FIG. 3, but shows an alternative embodiment of the shell frame;
FIG. 5 - is sinilar to FIG. 2, but shows the uphDlstery partially cut away to reveal interxal detail;
FIG. 6 - is a view partly in section along 6-6 of FIG.
5;
FIG. 7 - is a secti.onal view along 7-7 of FIG. 6, and FIG. 8 - sh~ws in side elevation a back support in use.
l i~95~
DESCRIPTION OF PREFEXRED EM~ODIMENT
_, . . . _ ~ . _ Referring to the drawings in detail, a backrest is indicated generally therein by the numeral 10. Backrest 10 comprises a shell support 12 having 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 lcwer areas of the ~ackrest. Shell support 12 is generally arcuately form~d with a shallow concave section taken laterally, as seen in Fig. 7. In m~dial longitudinal section shell supFort 12 is a shallow S ~hape, best seen in Fig. 6, correspondlng generally to the normal curvature of the spine of a person in an erect position taken between the lower lumbar vertebrae and about the fourth up~er most thoracic vertebrae, the area of inflexion 18 of the S shape thereby locating at about mid height of central portion 14.
The shallow S shape of the shell supFort e~tends outwardly to the lateral margins 20 of the shell support, as seen best in Fig. 3.
~ hell support 12 has a pair of relatively large laterally elongated window openings 22,24 which extend from adjacent opposed lateral margins 20 respect~vely thereby formung three relatively broad horizontally spaced back support areas or kands 26,28,30, band 2~ 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 resin and glass fibre reinforced thermosetting polyester resins having been found to be particularly satisfactory because of the relatively high stiffness afforded by ~oderately thin sections 95~2 - 6 ~ 1403 P/3 CA
thereof. Typically m0dial sections of shell support 12 will have a thickness of sone 3.5 to 4 mm, this decreasing by scme 20 percent on approach to lateral margins 20.
Shell support 12 is upholstered with a layer of spongy foam material 32 adhered to the concave side of the support, a thinner layer 34 of spongy foam material on the backside of the support ccmpleting the envelope. Preferably foan material layers 32,34 are open celled to permit the passage of air an~ moisture vapour therethrough. A fabric cover 36 in its turn en~elopes the foam layer. Fa~ric cover 36 is stretched relatively tightly between the lateral margins 20 of shell support 12, to leave an air space 38 ketween the cover and foam layer 32. Fabric cover is preferably of a knitted material cut so as to be preferably stretchable in the lateral direction. Cbver 36 is provided with a lateral separable seam 40 joined by a Velcro fastener or the like.
Velcro is a trade mark for a nylon material made wqth both a surface of tiny hooks and a complementary surface of an adhesive pile that can be pressed tcgether or pulled apart for easy fastening or unfastening.
In a further embodiment of the invention shDwn in Fig. 4, a shell support 112 is provided with a plurality of openings 114 therein distributed generally uniformly over the surface of the support within the margins thereof, shell support 112 being otherwise identical to shell support 12.
Having described the structure of backrest 10 the ~anner of use will now be described. Backrest 10 is typically interposed between the back of a person and a supporting chair back 42, where the person is seated, as shown in Fig. 8. It will be apparent ~hat backr.est 10 could be unified with the seatiny p~rtion 44 of the chair, or otherwise be integrated into the structure of the chair or indeed any other structure upon which the frame of a person is reposed. ~dvantages of the separable ~ ~95~
_ 7 _ 1403 P/3 structure reside in its portability, and also the ease of adjustment. Desirably whe~ used backrest 10 is Fositioned so that horizontal support areas 26,28,30 of shell support 12 support upper p~rtions of the thoracic spine, lower portions of the lumk~r spine, and the vertebrae where the thoracic spine and lumbar spine meet.
When back pressure is init;~lly applied to oover 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 ooncavity of shell support 12 is progressively decreased; lateral margins 20 thereby moving apart.
This movement of the lateral margins in its t~rn further stretches cover 36, still further assisting in the delocalization of pressure experienced on spinal areas of the back of a usex, with ~amewhat increased pxessure being experienced in the wing areas.
It will be appreciated that whilst foam layer 32 acts to delocalize pressure, it is of assistance in reducing relative movement bet~en oover 36 and shell support 12 adjacent margins 20 of the shell support. Cover 36 also assists in ventilatiny backrest 10. Thus as pressure is alternately applied to and released frcm cover 36 the volume of air space 38 will vary, with air being alternately expelled frcm and aspirated into the air space, air thus being caused to circNlate through the cover and throu~h the open celled foam layers 32 and 34.
Whilst in the illustrated embodiments presently preferred features of the invention have been put forward, it is to be ur~erstood that the invention is n~t limited to tbe precise fo ms .
~ ~g5~
- ~ 1403 P/3 illustrated, and that changes may be made thereto without departing fr~n the spirit and substance of the invention.
:`
, ~0 .
It is then, an object of this invention to provide a backrest which aids in providing good posture and support for the back.
It is a further object of the invention to provide a light, portable kackrest of the above type.
It is another object of the invention to provide a kackrest which has a resilience in lateral direction to ~onform 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 p~ovide a backrest having adequate stiffness but which is ventilated to enhance user comfort.
SUMMARY OF INVENTION
In accordance with one aspect of the invention, a backrest ccmprises a shell support having in medial longitudinal section a shallow S shape, and in lateral section a shallow concave shape, the shell support being relat~^vely stiff and unyielding in medial longitudinal portions and relatively resilient in transverse medial portions when subject to normally applied kack pressure, ; so as to tend to con~orm to the girth of a user.
Preferably the shell support ocmprises a central portion having opposed wing portions projecting there~ram at each side thereof in a unitary structure. Desirably the thickness of the shell support reduces progressively in passing from the central ~, 1 ~ 5g58~
_ 3 - 1403 P/3 portion to the wing portions, so as to increase the lateral resilience of the shell support, 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 medial longitudinal portions of the shell support be proportioned so that the are~
of inflexion of the S shape locates at a~out mid height of such portions.
In accordance with another aspect of the invention the shell support is provided with a plurality of openings therein to permit the escape of heat therethrough. Desirably a pair of laterally elongated window openings are provided for this purpose, these window openings further serving to increase the resiliency of the shell support in lateral planes~ m ese laterally elongated wnndow openings intersect the longitu~inal medial section of the shell support ab~ve and below the area of inflexion respectively;
the backrest is normally used wherein the wlndow openings o~erlay mid sections of the thoracic vertebrae and mid sections of the lumbar vertebrae respectively. As a corollary, non-windowed sections of the shell support locate to support upper and lower portions of the thoracic vertebrae and lumbar vertebrae respectively.
In accordance with yet another aspect of the invention the back suppo~t is upholstered on the concave side thereof with a soft, resilient sponge material, this in turn being covered with a cloth cover which is preferably stretchable in a lateral direction, the cloth cover spanning between the laterally opp3sed margins of ~ ~ 595g2 - 4 - 1~03 P/3 the back s ~ ort under tension so as to be unsupported in medial portions thereof and ~reate an A;r pccket between the cover and support, ~hich air pocket is c~llapsible to expel air therefrDm and ventilate the backrest.
The above objects and aspects of my invention will ~e made m~re clear, and still others and the ahvantages thereof will become evident fn3n the following di æ losure of a preferred embodiment of the invention, taken in oDnjunction with the acoompanying drawings.
BRIEF DESCRIPTICN OF DR~WING5 FIG. 1 - show~ the backrest of the invention in a front~l perspective view;
FIG. 2 sh~ws the backrest of FIG. 1 rotated through about 180 abDut its longitudinal axis; ^' FIG. 3 - shDws an interior shell frame of the backrest in fr~ntal perspective view;
FIG. 4 - is similar to FIG. 3, but shows an alternative embodiment of the shell frame;
FIG. 5 - is sinilar to FIG. 2, but shows the uphDlstery partially cut away to reveal interxal detail;
FIG. 6 - is a view partly in section along 6-6 of FIG.
5;
FIG. 7 - is a secti.onal view along 7-7 of FIG. 6, and FIG. 8 - sh~ws in side elevation a back support in use.
l i~95~
DESCRIPTION OF PREFEXRED EM~ODIMENT
_, . . . _ ~ . _ Referring to the drawings in detail, a backrest is indicated generally therein by the numeral 10. Backrest 10 comprises a shell support 12 having 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 lcwer areas of the ~ackrest. Shell support 12 is generally arcuately form~d with a shallow concave section taken laterally, as seen in Fig. 7. In m~dial longitudinal section shell supFort 12 is a shallow S ~hape, best seen in Fig. 6, correspondlng generally to the normal curvature of the spine of a person in an erect position taken between the lower lumbar vertebrae and about the fourth up~er most thoracic vertebrae, the area of inflexion 18 of the S shape thereby locating at about mid height of central portion 14.
The shallow S shape of the shell supFort e~tends outwardly to the lateral margins 20 of the shell support, as seen best in Fig. 3.
~ hell support 12 has a pair of relatively large laterally elongated window openings 22,24 which extend from adjacent opposed lateral margins 20 respect~vely thereby formung three relatively broad horizontally spaced back support areas or kands 26,28,30, band 2~ 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 resin and glass fibre reinforced thermosetting polyester resins having been found to be particularly satisfactory because of the relatively high stiffness afforded by ~oderately thin sections 95~2 - 6 ~ 1403 P/3 CA
thereof. Typically m0dial sections of shell support 12 will have a thickness of sone 3.5 to 4 mm, this decreasing by scme 20 percent on approach to lateral margins 20.
Shell support 12 is upholstered with a layer of spongy foam material 32 adhered to the concave side of the support, a thinner layer 34 of spongy foam material on the backside of the support ccmpleting the envelope. Preferably foan material layers 32,34 are open celled to permit the passage of air an~ moisture vapour therethrough. A fabric cover 36 in its turn en~elopes the foam layer. Fa~ric cover 36 is stretched relatively tightly between the lateral margins 20 of shell support 12, to leave an air space 38 ketween the cover and foam layer 32. Fabric cover is preferably of a knitted material cut so as to be preferably stretchable in the lateral direction. Cbver 36 is provided with a lateral separable seam 40 joined by a Velcro fastener or the like.
Velcro is a trade mark for a nylon material made wqth both a surface of tiny hooks and a complementary surface of an adhesive pile that can be pressed tcgether or pulled apart for easy fastening or unfastening.
In a further embodiment of the invention shDwn in Fig. 4, a shell support 112 is provided with a plurality of openings 114 therein distributed generally uniformly over the surface of the support within the margins thereof, shell support 112 being otherwise identical to shell support 12.
Having described the structure of backrest 10 the ~anner of use will now be described. Backrest 10 is typically interposed between the back of a person and a supporting chair back 42, where the person is seated, as shown in Fig. 8. It will be apparent ~hat backr.est 10 could be unified with the seatiny p~rtion 44 of the chair, or otherwise be integrated into the structure of the chair or indeed any other structure upon which the frame of a person is reposed. ~dvantages of the separable ~ ~95~
_ 7 _ 1403 P/3 structure reside in its portability, and also the ease of adjustment. Desirably whe~ used backrest 10 is Fositioned so that horizontal support areas 26,28,30 of shell support 12 support upper p~rtions of the thoracic spine, lower portions of the lumk~r spine, and the vertebrae where the thoracic spine and lumbar spine meet.
When back pressure is init;~lly applied to oover 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 ooncavity of shell support 12 is progressively decreased; lateral margins 20 thereby moving apart.
This movement of the lateral margins in its t~rn further stretches cover 36, still further assisting in the delocalization of pressure experienced on spinal areas of the back of a usex, with ~amewhat increased pxessure being experienced in the wing areas.
It will be appreciated that whilst foam layer 32 acts to delocalize pressure, it is of assistance in reducing relative movement bet~en oover 36 and shell support 12 adjacent margins 20 of the shell support. Cover 36 also assists in ventilatiny backrest 10. Thus as pressure is alternately applied to and released frcm cover 36 the volume of air space 38 will vary, with air being alternately expelled frcm and aspirated into the air space, air thus being caused to circNlate through the cover and throu~h the open celled foam layers 32 and 34.
Whilst in the illustrated embodiments presently preferred features of the invention have been put forward, it is to be ur~erstood that the invention is n~t limited to tbe precise fo ms .
~ ~g5~
- ~ 1403 P/3 illustrated, and that changes may be made thereto without departing fr~n the spirit and substance of the invention.
:`
, ~0 .
Claims (16)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. - A backrest comprising a shell support having in lateral section a shallow concave form, said shell support being relatively stiff in the longitudinal medial section and relatively resilient in transverse medial portions, and an upholstered finish therefor comprising a cover stretched between lateral margins of said shell support.
2. A backrest as defined in Claim 1, wherein said shell support is a moulded plastic material.
3. A backrest as defined in Claim 1, wherein said shell support is moulded from a glass fibre reinforced plastic material.
4. A backrest as defined in Claim 1, 2 or 3, wherein a layer of resilient foam material is interposed between at least the concave surface of said shell support and said cover.
5. A backrest as defined in Claim 1, 2 or 3, wherein said shell support is covered by a layer of resilient foam material adhered thereto.
6. A backrest as defined in Claim 1, 2 or 3, wherein a layer of resilient foam material is adhered to the concave surface of said shell support and an air space is provided between medial portions of said foam and said cover.
7. A backrest as defined in Claim 1, 2 or 3, wherein at least one opening is provided in said shell support.
8. A backrest as defined in Claim 1, 2 or 3, wherein said shell support has a shallow S shape in longitudinal medial portions.
9. A backrest as defined in Claim 1, 2 or 3, wherein said shell support has a shallow S form in longitudinal medial portions, and wherein the area of inflexion of said shallow S shape locates at about mid-height of said shell support.
10. A backrest as defined in Claim 1, 2 or 3, wherein said shell support includes opposed wing portions which increase generally in their lateral dimension on approach to the lower areas of the backrest.
11. A backrest as defined in Claim 1, 2 or 3, wherein said cover comprises a knitted material more stretchable in the lateral direction than in the longitudinal direction.
12. A backrest comprising a shell support having in lateral section a shallow concave shape and in longitudinal section a shallow S form, a layer of resilient material adhered to the concave surface of said shell support, and a cover stretched between lateral margins of said shell support to provide an air space between said cover and said resilient material adjacent medial portions of said shell support.
13. A backrest as defined in Claim 12, wherein said shell support is provided with one or more openings therein.
14. A backrest as defined in Claim 12, wherein said cover is a fabric material stretchable along the lateral direction.
15. A backrest as defined in Claim 12, 13 or 14, wherein said shell support is moulded from a thermoplastic material.
16. A backrest as defined in Claim 12, 13 or 14,wherein said shell support comprises integral wing portions on each lateral side thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000392050A CA1159582A (en) | 1981-12-11 | 1981-12-11 | Back rest |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000392050A CA1159582A (en) | 1981-12-11 | 1981-12-11 | Back rest |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000439804A Division CA1198232A (en) | 1983-10-26 | 1983-10-26 | Back rest |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1159582A true CA1159582A (en) | 1983-12-27 |
Family
ID=4121597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000392050A Expired CA1159582A (en) | 1981-12-11 | 1981-12-11 | Back rest |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1159582A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0469620A1 (en) * | 1990-08-01 | 1992-02-05 | Gideon Cohen | Orthopedic cushion |
| EP0536868A1 (en) * | 1991-10-07 | 1993-04-14 | Core Products International Inc. | Lumbar support back rest |
| EP0554306A1 (en) * | 1990-10-23 | 1993-08-11 | Davband Pty Ltd | Back support for a chair or seat. |
| US20180228441A1 (en) * | 2015-08-07 | 2018-08-16 | Aergo Ltd | Support system and method |
| CN111432687A (en) * | 2017-12-05 | 2020-07-17 | 斯蒂尔凯斯有限公司 | Compliant back rest |
-
1981
- 1981-12-11 CA CA000392050A patent/CA1159582A/en not_active Expired
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0469620A1 (en) * | 1990-08-01 | 1992-02-05 | Gideon Cohen | Orthopedic cushion |
| AU642275B2 (en) * | 1990-08-01 | 1993-10-14 | Gideon Cohen | Orthopedic cushion |
| US5389064A (en) * | 1990-08-01 | 1995-02-14 | Cohen; Gideon | Orthopedic cushion |
| US5522793A (en) * | 1990-08-01 | 1996-06-04 | Cohen; Gideon | Orthopedic cushion |
| EP0554306A1 (en) * | 1990-10-23 | 1993-08-11 | Davband Pty Ltd | Back support for a chair or seat. |
| EP0554306A4 (en) * | 1990-10-23 | 1994-04-13 | Davband Pty. Limited | |
| EP0536868A1 (en) * | 1991-10-07 | 1993-04-14 | Core Products International Inc. | Lumbar support back rest |
| US20180228441A1 (en) * | 2015-08-07 | 2018-08-16 | Aergo Ltd | Support system and method |
| US11266353B2 (en) * | 2015-08-07 | 2022-03-08 | Aergo Ltd | Support system and method |
| CN111432687A (en) * | 2017-12-05 | 2020-07-17 | 斯蒂尔凯斯有限公司 | Compliant back rest |
| CN111432687B (en) * | 2017-12-05 | 2023-11-07 | 斯蒂尔凯斯有限公司 | Compliant backrest |
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