A back portion for a chair has a back frame, the back frame having a lower portion adapted to extend across at least a major part of a lower region of a seated adult occupant's back, an upper portion vertically spaced from the lower portion and adapted to extend across at least a major part of an up
A back portion for a chair has a back frame, the back frame having a lower portion adapted to extend across at least a major part of a lower region of a seated adult occupant's back, an upper portion vertically spaced from the lower portion and adapted to extend across at least a major part of an upper region of the occupant's back, and a relatively narrow interconnecting region between the upper portion and lower portion. The relatively narrow interconnecting region is resiliently flexible to provide a flexing movement in a rearward direction of the upper portion relative to the lower portion. A cover operatively connected to the back frame provides a supporting surface for the back of the seated occupant.
대표청구항▼
1. A chair comprising: a back portion comprising: a back frame,the back frame comprising a lower portion supported from another part of the chair and adapted to extend across at least a major part of a lower region of a seated adult occupant's back, wherein the lower portion of the back frame compri
1. A chair comprising: a back portion comprising: a back frame,the back frame comprising a lower portion supported from another part of the chair and adapted to extend across at least a major part of a lower region of a seated adult occupant's back, wherein the lower portion of the back frame comprises a transversely extending top member, a transversely extending bottom member, and at least two spaced apart members interconnecting the top and bottom members,an upper portion adapted to extend across at least a major part of an upper region of the occupant's back, wherein the upper portion of the back frame comprises a transversely extending top member, a transversely extending bottom member, and at least two spaced apart generally vertical members interconnecting the top and bottom members, anda relatively narrow interconnecting region that is centrally disposed in a horizontal width direction of the back frame and that extends between and is connected to the transversely extending bottom member of the upper portion and to the transversely extending top member of the lower portion to connect a lower part of the upper portion to an upper part of the lower portion and provide a vertical spacing between the upper portion and lower portion,wherein the relatively narrow interconnecting region is resiliently flexible to provide a flexing movement in a rearward direction of the upper portion relative to the lower portion and relative to said another part of the chair; anda cover operatively connected to the back frame to provide a supporting surface for the back of the seated occupant, wherein the cover is connected to at least the transversely extending top member of the upper portion of the back frame and to at least the transversely extending bottom member of the lower portion of the back frame, and wherein a portion of the cover is suspended between the upper portion of the back frame and the lower portion of the back frame across the relatively narrow interconnecting region of the back frame, with the suspended portion being spaced in front of the relatively narrow interconnecting region of the back frame. 2. A chair as claimed in claim 1, wherein the interconnecting region is further configured to twist with a torsional action about an axis extending along the relatively narrow interconnecting region between the upper portion of the back frame and lower portion of the back frame, to enable the upper portion of the back frame to twist relative to the lower portion of the back frame as a seated occupant turns their shoulder region while seated in the chair, and wherein the lower portion of the back frame is substantially unable to twist about an axis substantially parallel to and positioned between said at least two spaced apart members of the lower portion of the back frame. 3. A chair as claimed in claim 1, wherein the relatively narrow interconnecting region consists of a single member. 4. A chair as claimed in claim 1, wherein at least the lower part of the upper portion and at least the upper part of the lower portion are resiliently flexible. 5. A chair as claimed in claim 1, wherein the back portion is reclinable relative to said another part of the chair between an upright position and a reclined position, and wherein the back portion comprises at least one support member that is connected to and extends from the transversely extending bottom member of the lower portion of the back frame, to support the back portion from said another part of the chair, and wherein said at least one support member is connected to and extends from the transversely extending bottom member of the lower portion of the back frame such that substantially the entire back portion moves rearwardly and downwardly relative to said another part of the chair upon recline of the back portion. 6. A chair as claimed in claim 1, wherein the generally vertical members are positioned at or toward a respective end of the top and bottom transverse members of the upper portion of the back frame. 7. A chair as claimed in claim 1, wherein the top member of the upper portion of the back frame is generally linear when viewed from above the back portion, while the bottom member of the upper portion of the back frame is generally concave when viewed from the front of the back portion. 8. A chair as claimed in claim 1, wherein the two spaced apart members of the lower portion of the back frame connect respective ends of the top and bottom transverse members of the lower portion of the back frame. 9. A chair as claimed in claim 1, wherein at least the top member of the lower portion of the back frame is generally concave when viewed from the front, and the outer ends of the top member of the lower portion of the back frame and the spaced apart members of the lower portion of the back frame extend around the sides of the lower back of a seated adult occupant. 10. A chair as claimed in claim 1, wherein the back portion comprises arm assemblies having arm rests that are supported by the lower portion of the back portion. 11. A chair as claimed in claim 10, wherein arm supports extend from a lower region of the back portion, with the arm rests mounted to the arm supports. 12. A chair as claimed in claim 11, wherein the arm rests extend forwardly in a cantilevered arrangement from the arm supports adjacent the lower region of the back frame, and have inner surfaces that form a general continuation of the portion of the cover corresponding in position to the lower portion of the back frame when supporting a user. 13. A chair as claimed in claim 12, wherein the inner surface of each arm rest is curved. 14. A chair as claimed in claim 13, wherein the inner surface of each arm rest forms a general continuation of the concave curvature of the cover, at least when an occupant is side-sitting in the chair and applying force against the back portion by leaning sideways against the back portion. 15. A chair as claimed in claim 12, wherein each arm rest has a horizontal cushion panel on its upper surface for supporting an occupant's arm when the occupant is sitting in a forward-facing orientation in the chair, and a vertical cushion panel on its inner surface and extending downwardly from the horizontal cushion panel for supporting said part of the occupant's back when the occupant is sitting sideways on the seat portion. 16. A chair as claimed in claim 12, wherein there is sufficient spacing beneath the arm rests that an occupant's legs can fit under the arm rests when sitting generally sideways in the chair incorporating the back portion in use. 17. A chair as claimed in claim 16, wherein the arm rests are height adjustable relative to the back frame, and wherein in at least one of the height adjusted positions of the arm rests, there is sufficient spacing beneath the arm rests that an occupant's legs can fit under the arm rests when sitting generally sideways in the chair incorporating the back portion in use. 18. A chair as claimed in claim 1, wherein the cover is a resilient material, and wherein the cover consists of a molded polymeric material. 19. A chair as claimed in claim 18, wherein the cover comprises integrally molded attachment features for connecting the cover to the back frame. 20. A chair as claimed in claim 18, wherein the molded polymeric material is an elastomeric material. 21. A chair as claimed in claim 20, wherein the molded polymeric material is a thermoplastic polyester elastomer. 22. A chair as claimed in claim 18, wherein the cover is formed as a mesh to provide enhanced breathability through the cover. 23. A chair as claimed in claim 1, further comprising a lumbar support to provide additional support to a lumbar region of an occupant's back when sitting in a normal forward orientation in the chair, the lumbar support being supported from the back frame by being connected to the relatively narrow interconnecting region, the lumbar support comprising two spaced apart occupant supporting portions that are independently rearwardly moveable to provide substantially independent support for the two sides of the occupant's lower back. 24. A chair as claimed in claim 1, wherein the cover comprises a resilient material and two recessed sections, one extending into each side of the cover, wherein the recessed sections correspond generally in vertical position to the relatively narrow interconnecting region, to provide a clearance space for the elbows of a seated occupant in use, and wherein at least a major part of each of the recessed sections is spaced from any members of the back frame so that the recessed sections provide a compliant support surface for an occupant's elbows resting against the recessed sections in use. 25. A chair as claimed in claim 1, wherein said another part of the chair comprises a seat portion of the chair. 26. A chair as claimed in claim 1, wherein said another part of the chair comprises a supporting frame of the chair. 27. A chair comprising: a supporting frame;a seat portion for supporting a seated occupant;a back portion, at least a part of which has a concave curvature for supporting the back of the occupant when in a normal forward oriented position in the chair; wherein the seat portion, the back portion, and the supporting frame are operatively connected by a recline mechanism, the recline mechanism configured such that as the back portion of the chair is moved from an upright position to a reclined position, the seat portion is caused to move relative to the supporting frame, and wherein the recline mechanism is operatively connected to an underside of the seat portion by at least one operative connection, the at least one operative connection being positioned lower than any part of the seating surface of the seat portion; the chair further comprising a pair of arm rests positioned vertically higher than and at or toward either side of the seat portion adjacent the part of the back portion,wherein each arm rest has an inner surface that is cushioned and forms a general continuation of the concave curvature of the part of the back portion, at least when an occupant is side-sitting in the chair and applying force against the back portion by leaning sideways against the back portion;wherein a sufficient clearance is provided between the arm rest and the seat portion that an occupant can sit sideways on the seat portion with their legs extending under one arm rest and part of their back supported by the cushioned inner surface of the other arm rest and wherein said part of the back portion comprises a lower portion of the back portion having spaced apart curved side frame members, wherein the arm rests are supported from the back portion by arm supports having a curvature corresponding generally to that of the curved side frame members, the arm supports defining curved travel paths each having a curvature such that toward a lower end of the travel path, the travel path is oriented fowardly and upwardly, and toward an upper end of the travel path, the travel path is oriented more vertically than at the lower end thereof, wherein the arm rests are height adjustable relative to the arm supports, wherein in at least one of the height adjusted positions of the arm rests, there is sufficient spacing beneath the arm rests that an occupant's legs can fit under the arm rests when sitting generally sideways in the chair, and wherein the arm rests remain adjacent the curved side frame members throughout height adjustment of the arm rests as they travel along the curved travel paths defined by the arm supports. 28. A chair as claimed in claim 27, wherein each arm rest has a horizontal cushion panel on its upper surface for supporting an occupant's arm when the occupant is sitting in a forward-facing orientation in the chair, and a vertical cushion panel on its inner surface and extending downwardly from the horizontal cushion panel for supporting said part of the occupant's back when the occupant is sitting sideways on the seat portion. 29. A chair as claimed in claim 27, wherein the seat portion comprises a seat depth mounting that enables the seating surface of the seat portion to be selectively moved in a forward and rearward direction relative to the supporting frame independent of any movement of the back portion, and wherein the recline mechanism is operatively connected to the seat portion by being connected to the seat depth mounting. 30. A chair as claimed in claim 27, wherein the seat portion comprises a seat panel for supporting a cushion for supporting the seated occupant, and wherein the seat panel is substantially planar and has a central zone and two exterior side zones, one on either side of the central zone, and wherein the exterior side zones extend horizontally outwardly or horizontally outwardly and downwardly from the central zone so that the exterior side zones are not raised relative to the central zone. 31. A chair as claimed in claim 30, wherein the exterior side zones are resiliently flexible to enable the exterior side zones to deform downwardly from the central zone under the weight of an occupant's legs when the occupant sits sideways on the seat portion. 32. A chair as claimed in claim 27, wherein the recline mechanism comprises a recline member that spans between the support frame and the seat member, the recline member flexing without hingedly pivoting relative to the support frame as the back portion of the chair is moved from the upright position to the reclined position. 33. A chair as claimed in claim 27, wherein all of the operative connections between the recline mechanism and the underside of the seat portion are positioned lower than any part of the seating surface of the seat portion.
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이 특허에 인용된 특허 (169)
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