seat assembly

Abstract

A seat assembly comprising: a lower support platform extending in a longitudinal direction and including opposite side edges and a first flex region extending laterally between the opposite side edges, wherein the first flex region branches the lower support platform into a front portion and a rear portion, wherein the first flex region is bendable such that the rear portion is deflectable downward relative to the front portion; and an upper shell including opposite side members connected to the support platform by a pair of connectors, each of the connectors including a second flex region, wherein the second flex region is bendable such that the opposite side members are movable upward and / or inward relative to the lower support platform when the rear portion is deflectable downward relative to the front portion.

Description

[0001] This application is a divisional application of PCT patent application No. PCT / US2020 / 018785 filed on February 19, 2020 (which entered the Chinese national phase on August 20, 2021, with national phase application No. 202080015989.7 and the invention title "Body Support Component and Method for Use and Assembly of the Body Support Component"). Technical Field

[0002] This application generally relates to body support components, such as chairs, and particularly to backrest components and / or seat components incorporated into body support components, as well as various parts incorporated into body support components. This application also relates to methods for using and assembling body support components. Background Technology

[0003] Chairs, and especially office chairs, can have body support members constructed with a suspension material such as a mesh fabric that stretches across a frame. This suspension material conforms to the user's body, providing micro-compliance while improving airflow and consequently providing heat dissipation benefits. Typically, the frame must be rigid to maintain an appropriate level of tension in the suspension material. However, this rigidity can limit the flexibility of the body support member and introduce intolerable pressure points around the perimeter of the frame. Furthermore, the suspension material mounted on the seat of the chair often needs to maintain high tension due to the loads exerted on it by the seated user, which can worsen the limited flexibility and rigidity of the support structure.

[0004] While various mechanical systems, such as lumbar supports and tilt controls, can be introduced to alleviate limited flexibility and provide additional adjustability, these systems are relatively expensive to manufacture, require additional maintenance, are prone to wear over time, and may not be properly utilized by the user due to the need for individual adjustments. Furthermore, such tilt mechanisms typically include one or more rigid and non-compliant rigid links and mechanical connections, resulting in a more rigid and less comfortable ride, which can lead to an undesirable user experience. Conversely, systems that rely on the materiality of the seating structure to introduce appropriate kinematics and flexibility may not be suitable for supporting suspension materials. While body support surfaces can be defined by one or more foam pads, foam materials can restrict airflow and often fail to provide localized support. Additionally, body support components constructed with a plastic shell, such as those supported by a peripheral frame, typically do not provide a comfortable, body-conforming support surface. Summary of the Invention

[0005] This invention is defined by the foregoing claims, and nothing in this section should be construed as limiting these claims.

[0006] In one embodiment, the seat assembly includes a lower support platform having a first peripheral edge, an upper surface, and a lower surface. A support ring is coupled to and extends radially outward from the first peripheral edge of the lower support platform, and the support ring defines a second peripheral edge. The support ring includes an upper surface. An upper shell is disposed on the upper surface of the lower support platform and the upper surface of the support ring, and the upper shell defines a concave cavity. The upper shell has a third peripheral edge defining a central opening and has an upper surface. Suspension material is secured to the upper shell across the central opening and covers the concave cavity.

[0007] In another embodiment, one embodiment of the body support member includes a carrier frame having a first surface facing the body, a second surface opposite to the first surface, a peripheral edge surface extending between the first and second surfaces, and a peripheral groove formed in and opening outward from the peripheral edge surface. The support frame includes the first surface and the peripheral edge. A flexible edge member is connected to the peripheral edge of the support frame. The flexible edge member has an inner surface spaced apart from and facing the peripheral edge surface of the carrier frame. A gap is defined between the inner surface and the peripheral edge surface, wherein the gap communicates with the peripheral groove. A textile material includes the peripheral edge. The textile material covers the first surface of the carrier frame and is disposed in the gap between the inner surface of the flexible edge and the peripheral edge surface of the carrier frame. The textile material engages at least a portion of the peripheral edge surface of the carrier frame. The peripheral edge of the textile material is disposed in the peripheral groove.

[0008] In another embodiment, one method of manufacturing a body support member includes: setting a peripheral edge of textile material into a groove formed in a peripheral edge surface of a support frame; covering at least a portion of the peripheral edge surface of the support frame and a first body-facing surface of the support frame with the textile material; and connecting a flexible edge member to the support frame. The flexible edge member has an inner surface spaced apart from and facing the peripheral edge surface of the support frame, wherein a gap is defined between the inner surface and the peripheral edge surface, wherein the gap communicates with the peripheral groove, and wherein the textile material is disposed in the gap.

[0009] In another embodiment, the seat assembly includes a lower support platform extending in a longitudinal direction. The lower support platform includes opposing side edges and a laterally extending first flexural region extending between the opposing side edges, the first flexural region branching the lower support platform into a front and a rear portion. The first flexural region is flexible, allowing the rear portion to deflect downward relative to the front portion, even though in one embodiment both the front and rear portions can move upward during reclining. The upper shell includes opposing side members connected to the support platform via a pair of connectors. Each connector includes a second flexural region, wherein the second flexural region is flexible, allowing the opposing side members to move upward relative to the lower support platform when the rear portion can deflect downward.

[0010] On the other hand, the body support member includes a carrier frame having a central portion and a peripheral ring. The peripheral ring is connected to the central portion via a plurality of connectors, each connector having a flexural area, wherein the peripheral ring defines a central opening. An elastic textile material is coupled to the peripheral ring across the central opening. A pad is disposed between the central portion and the textile material. At least one of the plurality of connectors is capable of deflecting inward by a first amount from a first unloaded configuration to a first loaded configuration in response to a load applied to the elastic material, and the elastic material is capable of deflecting downward by a second amount from a second unloaded configuration to a second loaded configuration in response to a load applied to the elastic material. When the first and second deflections cause the elastic material to contact the pad, the pad engages the elastic material and provides auxiliary support to the elastic material.

[0011] In another embodiment, the body support member includes: a flexible load-bearing frame capable of deforming from an unloaded configuration to a loaded configuration; an elastic textile material attached to the load-bearing frame; and a pad disposed beneath the textile material. The flexible load-bearing frame, the elastic material, and the pad provide a first, second, and third amount of elastic support to a user engaged with and supported by the textile material.

[0012] In another embodiment of the body support member, a load-bearing frame has opposing side portions defining an opening between them. An elastic textile material is attached to the side portions across the opening, wherein a pad is disposed beneath the textile material. At least one, preferably both, side portions are capable of deflecting inward by a first amount from a first unloaded configuration to a first loaded configuration in response to a load applied to the elastic material. The elastic material is capable of deflecting downward by a second amount from a second unloaded configuration to a second loaded configuration in response to a load applied to the elastic material, and when the first and second deflections cause the elastic material to contact the pad, the pad engages the elastic material and provides auxiliary support to it.

[0013] On the other hand, one embodiment of the body support assembly includes a seat having opposite sides spaced apart in a lateral direction and a front and rear portion spaced apart in a first longitudinal direction.

[0014] It also provides various methods for using and assembling body support components and other parts.

[0015] Various embodiments of the body support components and parts, as well as methods for using and assembling them, offer significant advantages over other body support components and methods. For example, and not limited to, the structure allows suspension material to be integrated into the backrest and / or seat while maintaining the overall flexibility of these components. The structure and user engagement surface provide a body support structure that adapts to the user's body during use and provides macroscopic compliance, while also providing microscopic compliance at the user engagement surface and avoiding a rigid engagement surface around the perimeter of the structure.

[0016] Furthermore, the various linkages and flexural areas provide a simple yet robust structure that ensures proper fit for a wide range of users without requiring complex mechanics and adjustment interfaces. The body support assembly, along with its various flexural areas and material conformability, offers enhanced comfort and fit while reducing costs by decreasing and / or eliminating the overall number of components, including various metal parts, thus lowering manufacturing costs. Additionally, conformable materials reduce the overall weight of the body support assembly and the associated transportation costs. The body support assembly is uncomplicated, durable, visually appealing, and has a long service life.

[0017] The foregoing paragraphs are provided in a general manner and are not intended to limit the scope of the claims set forth above. Various preferred embodiments and other advantages will be best understood by referring to the following detailed description taken in conjunction with the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a perspective view of one implementation of the body support component.

[0019] Figure 2 yes Figure 1 The image shows a right-side view of the body support component, where the left-side view is a mirror image of the right-side view.

[0020] Figure 3 yes Figure 1 The front view of the body support components shown.

[0021] Figure 4 yes Figure 1 Rear view of the body support components shown.

[0022] Figure 5 yes Figure 1 The bottom view of the body support components shown.

[0023] Figure 6 yes Figure 1 Top view of the body support components shown.

[0024] Figure 7A , Figure 7B and Figure 7C This is a partial cross-sectional view of the body support structure.

[0025] Figure 8 This is a partial perspective view of the seat; the textile material is not shown in order to illustrate the components located below.

[0026] Figure 9 This is a top view of one embodiment of the seat support structure. The textile material or the load-bearing frame is not shown in order to illustrate the components located below.

[0027] Figure 10 This is a bottom-view perspective view of one embodiment of the lower seat support platform.

[0028] Figure 11 yes Figure 10 The right-side view of the support platform shown is provided, where the left-side view is a mirror image of the right-side view.

[0029] Figure 12 yes Figure 10 The rear view of the support platform shown.

[0030] Figure 13 yes Figure 10 The top view of the support platform shown.

[0031] Figure 14 This is a left-side view of one embodiment of the support ring, wherein the right-side view is a mirror image of the left-side view.

[0032] Figure 15 yes Figure 14 The top view of the support ring shown.

[0033] Figure 16 This is a side view of one embodiment of the upper seat shell.

[0034] Figure 17 yes Figure 16 The top view of the upper shell shown.

[0035] Figure 18 This is a schematic side view illustrating the flexing of the seating assembly during reclining.

[0036] Figure 19This is a schematic front view illustrating the deflection of the seating assembly during reclining.

[0037] Figure 20 This is an exploded view of the seat assembly.

[0038] Figure 21 This is a schematic diagram showing the four-bar linkage that supports the seat assembly.

[0039] Figure 22 This is a partial cross-sectional view of the front part of the seat assembly.

[0040] Figure 23 This is a partial cross-sectional view of the side of the seat assembly.

[0041] Figure 24 This is a partial cross-sectional view of the top of the back support.

[0042] Figure 25 This is a partial cross-sectional view of the side of the back support component.

[0043] Figure 26 This is a flowchart illustrating the assembly of the seat assembly.

[0044] Figure 27 It is a partial plan view of the textile material installed on the seat assembly and back support.

[0045] Figures 28A to 28D The diagram shows a bottom view, a top view, an exploded view, and an enlarged cross-sectional view of the connection between the front link and the seat assembly.

[0046] Figure 29 This is a partial view of one embodiment of the support.

[0047] Figure 30 This is a partial sectional view of the seat assembly. Detailed Implementation

[0048] It should be understood that the term "a plurality of" as used herein refers to two or more. The term "longitudinal" as used herein refers to or relates to the length or longitudinal direction 2, 2', such as the direction extending from the bottom of the backrest assembly 6 to the top of the backrest assembly 6, or from the top of the backrest assembly 6 to the bottom of the backrest assembly 6, or from the front of the seat assembly 8 to the rear of the seat assembly 8, or from the rear of the seat assembly 8 to the front of the seat assembly 8. The term "lateral" as used herein refers to being located, pointing towards, or extending in the left-right direction 4 of the body support assembly 10, which in one embodiment is shown as an office chair including the backrest assembly 6 and the seat assembly 8. It should be understood that the body support assembly can be constructed as any structure supporting the body, including but not limited to automotive, aircraft and public transportation seating, beds, home furnishings (including sofas and chairs), and other similar and suitable structures. In one embodiment of the backrest assembly disclosed below, the lateral direction 4 corresponds to the horizontal direction and the longitudinal direction 2 corresponds to the vertical direction, while in one embodiment of the seat assembly, the longitudinal direction 2' corresponds to the horizontal direction. The lateral direction 4 can be referred to as the X direction, while the longitudinal directions 2 and 2' refer to the Y direction, and the Z direction is orthogonal to the body support surfaces of both the backrest assembly 6 and the seat assembly 8.

[0049] The term "connection" refers to being directly or indirectly connected to or joined to, for example, through an intermediate member, and does not require that the connection be fixed or permanent, even if the connection may be fixed or permanent. The terms "first," "second," etc., as used herein do not imply assignment to a specific component so specified, but simply refer to such components in the order in which they are presented numerically. This means that a component designated as "first" may subsequently be "second" that component, depending on the order in which the components are referenced. It should also be understood that the designation of "first" and "second" does not necessarily mean that the two components or values ​​so specified are different. This means, for example, that a first direction may be the same as a second direction, where each direction can simply be applied to different components. The terms "upper," "lower," "rear," "front," "before," "after," "vertical," "horizontal," "right," "left," and variations or derivatives of these terms refer to those shown as... Figures 1 to 6The orientation of an exemplary body support assembly 10 of a chair, viewed from the perspective of a user seated in the body support assembly 10. The term "lateral" means non-parallel. The term "outward" refers to a direction away from the center position; for example, the phrase "radially outward" refers to a feature off-center, such as a middle or inner area of ​​the seat or backrest, and is generally located in the XY plane defined by the lateral and longitudinal directions 2, 2', 4. It should be understood that features or parts facing or extending "outward" do not necessarily originate from the same center point, but generally extend outward along a non-tangential vector and emanate externally. Conversely, the term "inward" refers to a direction facing toward the center or inner position.

[0050] The term "textile material" refers to a flexible material made from a web of natural or man-made fibers (yarns, monofilaments, threads, etc.). Textile materials can be formed by weaving, knitting, crocheting, knotting, felting, or braiding. Textile materials can include: various furniture upholstery materials that can be used, for example, to cover foam padding; and / or suspension materials that can be stretched across openings or placed under tension to support a user.

[0051] Body support components:

[0052] Reference Figures 1 to 6 The body support assembly 10 is shown as including a tilt control assembly 18, also referred to as a lower support structure, a base structure 12, a backrest assembly 6, and a seat assembly 8. In one embodiment, the base structure 12 includes a leg assembly 14 and a support column 16 coupled to and extending upward from the leg assembly. The tilt control assembly 18 is supported by and coupled to the top of the support column 16. The leg assembly can alternatively be constructed as a fixed structure, such as a quadrupedal base, a sled-like base, or other configuration. In one embodiment, the support column 16 can be height-adjustable, including, for example, but not limited to, a telescopic column with pneumatic, hydraulic, or electromechanical actuators. The leg assembly 14 includes a plurality of support legs 22 extending radially outward from a hub 24 surrounding the support column. Each support leg may be end-equipped with casters, tracks, or other floor contact members 20.

[0053] exist Figures 1 to 6 In this embodiment, a pair of armrest assemblies 26 are coupled to the tilt control assembly 18. Various user engagement surface controls 28 are provided for actuating and / or adjusting the height of the seat, including, for example, an actuation rod pivotally coupled to the armrest assembly, or for controlling the tension and / or restoring force of the tilt control assembly 18.

[0054] Tilt control components:

[0055] Refer to Figure 1 to Figure 6 and Figures 28A to 28DThe backrest assembly 6 and seat assembly 8 are operably connected to, for example, a tilt control assembly 18 or a lower support structure that controls the movement of the backrest assembly 6 and seat assembly 8 during reclining. One embodiment of a suitable tilt control assembly is disclosed in U.S. Patent No. 9,826,839 entitled “Chair Assembly with Upholstery Covering,” the entire disclosure of which is incorporated herein by reference. The tilt control assembly may include a plurality of rigid control links that may be mechanically connected, for example via pivot pins, to form a linkage assembly including, for example, a four-bar linkage.

[0056] In other embodiments, the tilt control assembly includes integrally formed links 23, 25, and 33, which are configured, for example, to have a strategically deformable position that allows predetermined deformation and defines a "flexible region" or virtual pivot position, also referred to as a "flexible joint." Various configurations of the links and the flexible region can be constructed as shown and disclosed in U.S. Patent Publication No. 2016 / 0296026 A1 entitled "Seating Arrangement" and U.S. Patent Publication No. 2018 / 0352961 entitled "Seating Arrangement and Method of Construction," the entire disclosures of which are incorporated herein by reference.

[0057] For example, the tilt control component 18 can be configured as follows: Figure 21The illustrated four-bar linkage has a bottom or base link 33 connected to the base structure 12 in a first position, while the front link 23 and the rear link 25 connect the base link to the seat assembly 8. The base link 33, front link 23, and rear link 25 define the lower support structure. For example, the front link 23 and rear link 25 may be pivotally or flexibly connected to the base link 33 at flexural regions 29 and 31, whether integrally formed or otherwise. The front link 23 and rear link 25 may also be pivotally or flexibly connected to the seat assembly 8 at flexural regions 27 and 53, wherein a portion 57 of the seat assembly extending between flexural regions 27 and 53 defines the links of the four-bar linkage. The flexural region 53 is formed in the support platform 30 portion of the seat assembly. Various flexural regions 27, 29, 31, and 53 can be formed as movable hinges or thin flexible hinges, which are made of the same material as the two more rigid components connected to the movable hinge, so as to provide relative rotation or pivoting between the more rigid components by bending of the movable hinge. It should be understood that, in alternative embodiments, the links and rods of the mechanism can also be constructed as rigid links and rods connected at fixed hinge points.

[0058] In operation, the user can move the backrest assembly 6 and seat assembly 8 from an upright position or recline to a reclined position by partially flexing the four-bar linkage, including the seat assembly. It is contemplated that the four-bar arrangement used and described herein includes linkage arrangements with additional link members, such as five-bar, six-bar, etc. In various embodiments, the thickness of one or more links 23, 25, 33, 57, and especially the front link 23, base link 33, and seat link 57, and the thickness of predetermined flexural regions of these links 23, 25, 33, 57, can be positioned to achieve desired performance characteristics, including, for example, the flexibility of the links. Furthermore, in some embodiments, the thickness of the links can vary along the length of the links to achieve desired flexibility or stiffness across the links or in local portions of the links, such as at flexural regions 27, 28, 31, and 53. Furthermore, and for example, the front link and seat assembly link can be more flexible than the rear link 25 to achieve the desired flexibility of the four-bar linkage. In some embodiments, the various links can be more flexible in specific portions or local areas of the link, such that the link is substantially flexible in that local area, while being substantially non-flexible or poorly flexible in any other area of ​​the link. It should be noted that, depending on the desired support and bending characteristics, the relative area of ​​reduced thickness can extend a short distance or most of the length of the associated link.

[0059] Seat assembly:

[0060] Reference Figures 1 to 7C , Figures 8 to 25as well as Figures 28A to 28D The seat assembly 8 is operably coupled to the tilt control assembly 18 and supports the seating surface 28. The seat has opposite sides spaced apart in a lateral direction and a front and rear portion spaced apart in a first longitudinal direction. The seat assembly includes a lower support platform 30 having a peripheral edge 32, an upper surface 34, and a lower surface 36. In one embodiment, the lower support platform is shown in a plan view (see plan view 28). Figure 13 The device has a generally isosceles trapezoidal shape, which has a front edge 38, a rear edge 40, and a side edge 42 that joins the front and rear edges. The rear edge is shorter than the front edge. The peripheral edge 32 may be stepped, meaning that the peripheral edge portion 66 of the peripheral edge 32 is thinner than the central portion 68 of the peripheral edge 32.

[0061] The support platform 30 has a pair of laterally spaced pads 44 positioned at the front portion of the support platform. For example... Figures 28A to 28DAs shown, platform 30 includes a protrusion 970 defining a recess 974 and an opening 972. Each pad is defined as a hinge portion 976 having a front edge 978 that is secured to a front edge 980 of the opening 972 in the platform's defining platform. The hinge portion can be formed by overmolding a more flexible material to the supporting platform. The hinge portion 976 extends rearward in the opening, with a rear edge 982 spaced apart from a rear edge 984 of the platform's defining opening 972. Each pad in pad 44 includes at least one mounting member shown as an opening 46, which is shaped and sized to receive a mounting member (e.g., a fastener or stud 988) for securing the platform to a tilt control assembly, which may include a flange 990 extending forward from link 23 to support the platform. A flange 990 is received in a recess 972, and the flange 990 includes a boss extending upward into an opening 46, such that the flange 990 can be secured to the bottom surface of the pad, particularly the hinge portion 976, by a plurality of fasteners 988. The flexible hinge portion 976 defines a flexure region 27. The mounting components and their connection to the link 23 allow the support platform and the front link 23 to pivot relative to the base link 33 about the flexure region 29, and allow the seat assembly 8 to pivot relative to the front link 23 about the flexure region 27. In both cases, pivoting is performed, for example, by elastic deformation or bending of the portion of the front link located at the flexure regions 27, 29, or alternatively by bending or flexing of the pad or hinge portion 976. Meanwhile, the spacing between the pad and the front link provides relative stability to the front portion of the seat against rotational or torsional movement about the longitudinal axis. A boss structure 49 extends downward from the rear of the support platform. The boss structure 49 defines at least one mounting member connected to the tilt control assembly 18, and / or defines the rear link 25 as part of the tilt control assembly, and allows the support platform and the rear link 25 to pivot relative to the base link 33 about a flexure region 31, which can be performed, for example, by elastic deformation or bending of the portion of the base link 33 located at the flexure region 31. In one embodiment, the boss structure 49 has a tubular configuration defining a cavity surrounding or receiving an insertion portion of the rear link 25, configured to have features from connectors 479, 219. The centrally positioned rear link, serving as the sole support for the rear of the seat, allows rotational or torsional movement of the rear of the seat relative to the front of the seat about a longitudinal axis, wherein rotational or torsional movement of the front is limited as described above. The support platform 30 has a generally concave upper surface 34, wherein the front and rear portions 35, 37 extend upward from the boss structure.

[0062] The support platform can be made of a flexible, elastic polymer material, allowing it to conform and move in response to forces applied by the user. This polymer material can be, for example, any thermoplastic including nylon, glass-filled nylon, polypropylene, acetyl, or polycarbonate; any thermosetting material including epoxy resin; or any resin-based composite including carbon fiber or glass fiber. Other suitable materials can also be used, such as metals including steel or titanium; plywood; or composites including plastics, resin-based composites, metals, and / or plywood. The support platform can have strategically positioned tension plates, for example made of glass reinforcing strips, to accommodate bending and deformation of the structure. Strategic locations on the lower support platform also feature specific geometries that allow predetermined deformation and define "flexural regions" or virtual pivot positions, also referred to as "flexural joints."

[0063] For example, the support platform may include a reduced-thickness region defining a laterally extending flexural region or flexural area 53 in the front portion of the boss structure 49. This flexural area 53 divides or branches the support platform into a front and a rear portion, which may have different lengths or dimensions, wherein the rear portion is capable of deflecting downwards relative to the front portion as the flexural area bends during tilting. The portion of the support platform extending between the flexural area 53 and the flexural area 27 defines a link in a four-bar linkage, while the portion of the support platform located behind the flexural area 53 partially defines a portion of the rear link 25. It should be noted that, depending on the desired support and bending characteristics, the reduced-thickness relative region may extend a short distance or most of the width of the support platform. The phrase "flexible region" refers to a portion of a structure that allows flexing or bending within a designated area, thereby permitting or providing relative movement (e.g., pivoting) of components or structures on opposite sides of the flexible region, thus defining a virtual pivoting position such as a horizontal pivot axis. It should be understood that the virtual pivot axis can move during flexing and is not defined as a rigidly fixed axis. Various configurations and materials of the support platform can correspond to the configurations and materials of various components shown and disclosed in U.S. Patent Publication No. 2016 / 0296026 A1 entitled "Seating Arrangement" and U.S. Patent Publication No. 2018 / 0352961 entitled "Seating Arrangement and Method of Construction," the entire disclosures of which are incorporated herein by reference.

[0064] The support ring 48 has an inner ring 50 with an inner peripheral edge 52 defining a central opening 54. The inner peripheral edge 52 surrounds and connects to the outer peripheral edge 32 of the support platform, which is received in the opening 54, namely the rear edge 40, front edge 38, and side edge 42 of the support platform 30. The inner ring 50 has a trapezoidal shape defined by a front member 56, a rear member 58, and a pair of side members 60 defining the opening 54. The inner peripheral edge 52 may be stepped, meaning that the peripheral edge portion 70 of the inner peripheral edge 52 is thinner than the central portion 72 of the inner peripheral edge 52, wherein the edge portion 70 overlaps and engages with the edge portion 66 of the lower support platform. Figure 7A As shown, edge portion 70 is positioned above edge portion 66, wherein the upper surface of peripheral edge 52 is flush with the upper surface of support platform 30. Edge portions 70 and 66 can be secured with fasteners such as screws and / or adhesives. It should be understood that support platform 30 and support ring 48 define support frame 62 in a combined manner.

[0065] In one embodiment, the support ring 48 further includes an outer ring 74 having side members 76, which are coupled to the side members 60 of the inner ring via a pair of front connectors 78 and a pair of intermediate connectors 80. A pair of rear three-sided openings 81 are defined between the inner edge of the outer ring 74, the edge of the side members, and the edge of the connectors 80. Each opening 81 has an inner portion 85, an elongated outwardly curved side portion 87, and a third side portion 91, wherein the sides 87 and 85 converge along the rear of the opening 81 to define a nose portion 89, and the third side portion 91 extends along the connector 80 and defines the connector 80 and engages the sides 85 and 87. A pair of front three-sided openings 83 are defined between the inner edge of the outer ring 74, the edge of the side members 60, and the edge of the connectors 80. Each of the openings 83 has an inner side 93, an elongated outwardly curved side 95, and a third side 97, wherein the sides 93 and 95 converge along the front of the opening 83 to define the nose 99, and the third side 97 extends along the connector 80 and defines the connector 80 and joins the sides 93 and 95.

[0066] It should be understood that, in one embodiment, the intermediate connector 80 may be omitted. The outer ring has a front transverse member 82 and a rear member 58 shared with the inner ring and connected to the side member 76. The front transverse member 82 is spaced apart from the front member 56, which defines an elongated and laterally extending U-shaped opening 84 between the front transverse member 82 and the front member 56. A flexible membrane 55 covers the opening 84, its perimeter is connected to the support ring around the opening, and maintains the spacing between the transverse member 82 and the front member 56 when the transverse member 82 flexes relative to the front member 56, for example, when subjected to a load applied by the user's thigh. The membrane 55 may also serve as a limiter by limiting the amount of deflection of the transverse member 82 when a load is applied to the membrane 55. The membrane 55 may be made of urethane and may be overmolded onto the support ring 48 to cover the opening 84. The side groove 86 allows the front portion 88 of the side member 76 to flex or bend, so that the front member 82 can deflect when the user's leg is loaded, while the connectors 78, 80 provide greater rigidity to the outer ring 74. The outer peripheral edge 90 is stepped, meaning that the peripheral edge portion 92 of the outer peripheral edge 90 is thinner than the central portion 72 of the outer peripheral edge 90. A pair of lugs 94 extend downward from the inner ring and are positioned along both sides of the boss structure, wherein the lugs 94 are supported by the tilt control assembly 18. The support ring 48 extends radially outward from the lower support platform 30. The support ring, including the outer ring, inner ring, and connector, defines an upper surface 96 and a concave cavity 98. The support ring 48 is made of a flexible material configured to position and maintain the compliance of the flexible edge member 162, which will be described in more detail below. The support ring 48 has a lower stiffness than the support platform, and the support ring 48 has a lower elastic modulus than the support platform. The support ring can be made of, for example, polyester polyurethane or thermoplastic polyester elastomer.

[0067] The upper shell, also referred to as the support frame 100, has: a central portion 102 covering the inner ring 52 of the support ring and the lower support platform 30; and an outer ring 104 covering the outer ring 74 of the support ring and the upper surface 34 of the support platform. The outer ring 104 and the central portion 102 of the upper shell are connected to at least two connectors, including a pair of front connectors 106 and a pair of intermediate connectors 108, which are bent with an upward concave curvature to be rigid and resistant to outward / downward deflection / deformation.

[0068] A pair of rear three-sided openings 109 are defined between the inner edge of the outer ring 104, the edge of the central portion 102, and the edge of the connector 108. Each opening 109 has an inner portion 111, an elongated outwardly curved side portion 113, and a third side portion 117, wherein the sides 111 and 113 converge along the rear of the opening 109 to define a nose portion 115, and the third side portion 117 extends along the connector 108 and defines the connector 108 and engages with the sides 111 and 113. A pair of front three-sided openings 119 are defined between the inner edge of the outer ring 104, the edge of the central portion 102, and the edge of the connector 108. Each opening 119 has an inner portion 121, an elongated outwardly curved side portion 123, and a third side portion 127, wherein the sides 121 and 123 converge along the front of the opening 119 to define a nose portion 125, and the third side portion 127 extends along the connector 108 and defines the connector 108 and engages with the sides 121 and 123.

[0069] The outer ring 104 has a front transverse member 110 and a rear member 112 connected to the side member 114. The outer ring has a peripheral length defined around its perimeter, wherein this length is fixed or maintained relatively constant during the reclining of the seat. In other words, in one embodiment, the outer ring 104 defined by the side member 114, the front transverse member 110, and the rear member 112 does not elongate during reclining, or undergoes elastic deformation along the tangent or length of the outer ring 104 in response to tension, although the outer ring 104 can bend or flex as described in more detail below. The front transverse member 110 is spaced apart from the front edge 116 of the central portion 102, which defines an elongated and laterally extending U-shaped opening 118 between the front transverse member 110 and the front edge 116 of the central portion 102. The side groove 120 allows the front portion 122 of the side member 114 to flex or bend, so that the front lateral member 110 can deflect when the user's leg is loaded, while connectors 106, 108 provide greater rigidity to the outer ring 104. Connectors 106, 108 cover connectors 78, 80, with openings 84 and 118 aligned with the diaphragm 53. The upper housing includes a pad 124 covering the pad 46. The upper housing 100 is secured to the support platform by fasteners including, for example, hooks and screws.

[0070] The upper shell or load-bearing frame 100 is flexible but stiffer than the support ring 48 and has a higher elastic modulus than the support ring, but the stiffness of the load-bearing frame is less than that of the support platform 30, and the load-bearing frame has a lower elastic modulus than that of the support platform 30. The upper shell or load-bearing frame 100 may be made of a flexible, elastic polymer material, allowing the support platform to conform and move in response to forces applied by the user. This polymer material may include, for example, any thermoplastic including nylon, glass-filled nylon, polypropylene, acetyl, or polycarbonate; any thermosetting material including, for example, epoxy resin; or any resin-based composite material including, for example, carbon fiber or glass fiber. Other suitable materials may also be used, such as metals including, for example, steel or titanium; plywood; or composite materials including plastics, resin-based composites, metals, and / or plywood.

[0071] The intermediate connector 108 of the upper housing 100 may include a region defining a reduced thickness of a flexure region or flexure region 155. The upper housing 100 may also have a region defining a reduced thickness of a flexure region or flexure region 153, which covers a flexure region 53 located in the front of the boss structure 48 of the support platform below.

[0072] The upper shell or carrier frame 100 has a body-facing upper surface 126, a lower surface 128 opposite to the upper surface 126, and a peripheral edge surface 130 or side edge surface extending between the first surface 126 and the second surface 128. In one embodiment, the peripheral edge surface 130 is generally planar and has a vertical orientation; however, it should be understood that the edge surface may be curved, curved, or non-planar, and / or may be oriented at an angle other than the vertical plane. The carrier frame 100 defines a concave cavity 132 and an outer ring defines a central opening 134.

[0073] A peripheral groove 136 is formed in or on the peripheral edge surface 130 and opens outward from the peripheral edge surface 130. The groove 136 extends around at least a portion of the carrier frame, and in one embodiment, the groove 136 extends continuously around the entire periphery of the carrier frame 100. Figures 7A to 7CAs shown, the peripheral edge portion 92 of the support frame 62 extends outward beyond the surface 130 of the carrier frame. A peripheral groove 136 defines an insertion plane 137 oriented at an angle α relative to the peripheral edge surface 130 and relative to the adjacent gap G of the peripheral edge surface 130. In various embodiments, α is greater than 0 degrees and less than 180 degrees, and preferably between 30 degrees and 120 degrees, and more preferably between 45 degrees and 90 degrees. Alternatively, the insertion plane 137 is preferably oriented relative to the tangent of the landing portion 144 or the textile material 150 supported by the landing portion 144, such that the insertion plane is parallel to the landing portion and the tangent, or forms an angle β, which is preferably between 135 degrees and 180 degrees. The peripheral groove 136 has a pair of spaced-apart surfaces, such as an upper surface 138 and a lower surface 140, and a bottom 142 connecting the surfaces 138 and 140. The upper surface 126 of the upper shell has a generally horizontal landing portion 144 and an angled portion 146 extending away from the landing portion and defining a cavity. The landing portion 144 may have a width (W) close to 0, wherein the landing portion is defined only by the upper corner of the edge surface 130.

[0074] Textile material 150 is secured to the support frame 100 across the central opening 134, such that the textile material 150 covers the concave cavity 132. This textile material may be a suspension material or may cover a padding supported by the support frame 64 and / or the support frame 100. The textile material covers the upper surface 126 of the upper shell and engages the landing portion 144. The textile material 150 wraps around and engages a portion of the outer peripheral edge surface 130, and particularly the upper portion 152 of this peripheral edge surface extending between the groove 136 and the upper surface 126, or the landing portion 144 of the upper surface 126. The peripheral edge portion 154 of the textile material 150 is coupled to the peripheral edge of the upper shell, for example, where the edge portion 154 of the textile material is disposed in the groove 136. In one embodiment, a stay 156 formed, for example, by a ring (e.g., plastic or polyester), is used (in the absence of textile material). Figure 20(As shown in the diagram) It can be secured to the edge portion of the textile material, for example by adhesives, sewing / stitching, fasteners and other means, or by forming a ring surrounding the support. In one embodiment, the support has a surface 158 facing and engaging the textile material and an opposing surface 160 that remains uncovered. The support 156 and the edge portion 154 of the textile material configured to suspend the material are provided in a groove 136 to secure the suspended material across the opening under tension. In one embodiment, the support 156 is formed as a continuous ring of a fixed length, wherein the support 156 is relatively inelastic and resists elongation along its length, but the support 156 can be flexible and bendable to move together with the side member 114 and the outer ring 104 during reclining of the seat. In one embodiment, as Figures 7A to 7C As shown, the exposed or uncovered surface 160 of the support 156 directly engages the surface 138 of the recess, without any textile material or other substrate disposed between the surfaces 160 and 138. The angular orientation of the recess 136 and the support 156 relative to the edge surfaces helps ensure that the support 156 does not dislodge from the recess. In one embodiment, the support 156 and the textile material 150 are inserted into the recess 136 without any auxiliary fastening system such as adhesives or mechanical fasteners, but rather by friction engagement only when the textile / suspension material is under tension, as described below.

[0075] In another embodiment, and referring to Figure 22 and Figure 23 The support frame 62 includes a bottom wall 518 defining a surface facing the body and a peripheral edge wall 520 having an outer surface 522. In one embodiment, a lip 524 or retaining portion defined by a tab extends laterally inward from the peripheral edge wall 520 and defines a channel 526 with the bottom wall. Figure 23 The lip or retaining portion shown in Figure 44 has an engagement surface 528 along the side portion of the seat. This engagement surface 528 is angled upward and inward from the peripheral edge wall, while the upper surface of the wall is generally horizontal. The upper surface of the lip shown in Figure 44 is angled downward and inward along the front portion of the seat, while the engagement surface 528 is generally horizontal.

[0076] The support frame 100 has a body portion 530 and an insertion portion 534. The body portion 530 has a bottom surface 532 that covers and engages with the bottom wall. The insertion portion 534 is received in a channel 526 and engages with a mating surface 528. As shown in FIG44, the support frame has a downwardly and inwardly angled upper surface 536 that mates with the top surface of a lip or retainer, allowing the suspension material to deform relative to the angled surface. Figure 23As shown, the insertion portion 534 is angled downwards and outwards to mate with the engagement surface. The orientation of the insertion portion 534 facilitates installation because it is easier to insert into the channel when the insertion portion is oriented at an angle, such that the insertion portion is located below the lip 524. Tension applied by the textile material 150, configured as a suspension material in one embodiment, subsequently applies a torque to the carrier frame, causing the carrier frame to bear against the bottom surface of the support frame and the engagement surface 528. A flexible edge member 162 is coupled to the outer surface 522 of the peripheral edge wall of the support frame, wherein the lip 538 covers the top surface of the support frame. The flexible edge member 162 has an inner surface spaced from and facing inwards toward the peripheral edge wall of the carrier frame, wherein a gap is defined between the inner surface and the peripheral edge wall of the carrier frame. A portion of the textile material is disposed in this gap, wherein the textile material covers the body-facing surface of the carrier frame. The support frame has an outwardly facing peripheral edge 540 and includes a groove 542 that opens laterally outward from the peripheral edge 540. The peripheral edge of the textile material is secured to the bracket 156, wherein the edge portion of the textile material and the bracket are disposed in the groove 542.

[0077] Suspension material:

[0078] In one embodiment, the textile material is made of an elastic woven or knitted material and can be configured as a suspension material having heat-shrinkable yarns and heat-shrinkable elastic monofilaments, which shrinks in response to the application of energy, such as heat, whether the energy is applied by radiation or convection. Various suitable suspension materials are disclosed in U.S. Patent No. 7,851,390 entitled "Two-Dimensional Textile Material, Especially Textile Fabric, Having Shrink Properties and Products Manufacture Therefrom," the entire disclosure of which is incorporated herein by reference. A commercially suitable heat-shrinkable suspension material is SHRINX fabric, available from Krall+Roth, Germany.

[0079] Reference Figure 27In one embodiment, the suspension material is made of fabric preform 500 having multiple heat-shrinkable elastic (elastomer) threads 552 configured as monofilaments in one embodiment and multiple inextensible threads 554 configured as yarns or monofilaments in other embodiments. The heat-shrinkable elastic threads 552 extend in a first transverse direction 4 or a warp direction, and the threads 554 extend in the same transverse / warp direction 4. It should be understood that the heat-shrinkable elastic threads (e.g., monofilaments) and the inextensible threads (e.g., monofilaments) may also extend in longitudinal directions 2, 2'. In one embodiment, the heat-shrinkable elastic threads 552 and the multiple inextensible threads 554 alternate in a 1:1 or 2:1 ratio, or as... Figure 27 The elastic threads are arranged side-by-side as shown, with a braiding density of 4 to 10 elastic threads / cm in various embodiments, more preferably 7 to 9 elastic threads / cm, and in one embodiment, a braiding density of 8 elastic threads / cm. In other embodiments, the proportion of threads can be varied, with more or fewer elastic threads than inextensible threads. In one embodiment, the diameter of the elastic thread is approximately 0.40 mm, and it should be understood that the elastic thread can be made thicker or thinner depending on the desired spring stiffness. It should be understood that more or fewer elastic threads can be used depending on the cross-sectional area of ​​the threads. For example, the braiding density can be defined by the total cross-sectional area of ​​the combined elastic threads per centimeter (measured longitudinally), which includes, for example, elastic threads (whether single or multiple threads) with a combined cross-sectional area between 0.502 mm² / cm and 1.256 mm² / cm in various embodiments, more preferably between 0.879 mm² / cm and 1.130 mm² / cm, and in one embodiment, a combined cross-sectional area of ​​1.005 mm² / cm.

[0080] In one embodiment, a plurality of yarn strands 556 are interwoven with elastomer yarns 552 and inextensible yarns 554 in the weft or longitudinal directions 2, 2'. The inextensible yarns 554 and yarn strands 556 do not shrink upon exposure to heat or energy and are not elastomers. Instead, the yarn strands 556 provide shape control for the entire suspension material in its final configuration after heat shrinkage. The yarn strands 556 can be made of various colors, such as blue, thus providing color to the textile material. Therefore, the overall color of the fabric can be easily changed simply by introducing different yarns in the weft direction. In contrast, the elastomer yarns are preferably transparent or black.

[0081] Reference Figure 26 and Figure 29 The annular support 156 is fixed to the fabric blank, for example, by sewing or using nails or other fastening systems, wherein the annular support has a first annular edge 558 and a second annular edge 560. Figure 22 and Figure 23As shown, the annular support is rotatable 180 degrees between a first configuration and a second configuration. In the first configuration, a first annular edge 558 is radially inward from a second annular edge 560, and in the second configuration, the first annular edge 558 is radially outward from a second annular edge 560. When the support is in the first and second configurations, the first annular edges 558 on opposite sides of the support define a first dimension and a second dimension in a first lateral direction 2, 2', wherein in one embodiment the first dimension and the second dimension are substantially the same, meaning that as the support rotates, the first annular edge remains stationary, even if the support rotates 180 degrees. The support 156 includes an open notch 157 located in the second annular edge, which closes and allows the support to rotate from the first configuration to the second configuration. The fabric preform 500 is initially configured to have cavities of additional material at the corners to accommodate rotation of the support at these corners. After rotation, the bracket 156 can be installed in the carrier frame 100, and then the carrier frame and fabric are installed or connected to the support frame 62, wherein the flexible edge 162 is connected to the support frame 62 and is arranged around the periphery of the textile material.

[0082] For example, thermal energy can be applied from an energy source to the fabric blank, causing the heat-shrinkable elastomer yarn 552 to shrink. In other embodiments, the textile material is wrapped around or covers a padding or underlying substrate, such as a plastic or metal mesh supporting the user, wherein the edges of the textile material are secured to a support frame as described herein. In these embodiments, the textile material 150 may, but does not necessarily, be placed under tension around the padding or across the opening 134.

[0083] The flexible edge member 162 is configured as a loop surrounding and connected to the peripheral edge 92 of the support frame. It should be understood that the loop may be continuous, or the flexible edge member may extend only partially around the periphery of the carrier frame 100. The flexible edge member 162 extends upward from the support frame 64 and has an inner peripheral surface 164 or face that faces inwardly towards the carrier frame and is spaced apart from the peripheral edge surface 130 to form a gap G communicating with a groove 136. This gap G has, for example, but is not limited to, a width between 0.50 mm and 1.00 mm, meaning that the groove and the gap form a continuous but non-linear slot opening or passage for receiving the textile material 150. In one embodiment, the inner surface 164 is generally planar and has a vertical orientation, extending in the Z direction; however, it should be understood that the edge surface may be curved, wavy, or non-planar, and / or may be oriented at an angle other than the vertical plane. In one embodiment, the inner surface 164 has a shape substantially the same as the peripheral edge surface 130, such that the gap G remains constant, regardless of whether either surface or gap G is linear. In one embodiment, the gap G is the same as or slightly larger than the thickness of the textile material, which may have a thickness of about 0.75 mm to 1.00 mm. In other embodiments, there is no gap (i.e., G = 0) or the gap G is less than the thickness of the textile material, wherein surfaces 130, 164 abut and / or press or slightly compress the textile material 150 between surfaces 130, 164. The inner surface 164 faces and covers the groove 136 and the textile material 150. Furthermore, the flexible edge member 162 further clamps the support 156 and the textile material 150, thereby further helping to ensure that the support 156 does not dislodge from the groove 136.

[0084] The flexible edge member 162 is made of a thermoplastic olefin or thermoplastic elastomer and may be made of the same material as the membrane 53, such that the flexible edge member can be compressed, for example, in the event of an impact. The flexible edge member 162 has greater elasticity, or greater flexibility, and has a significantly lower modulus of elasticity compared to the support frame 62, and a stiffness of 80 to 90 in one embodiment within the Shore D range. The flexible edge member 162 protects the textile material 150 from unintentional impacts and abrasions, and has an upper surface 166 that is generally flush with or slightly lower than the upper surface 168 of the textile material 150, thereby preventing snaps and providing a pleasing appearance. As mentioned, the flexible edge member 162 is adjacent to or slightly spaced from the portion of the textile material 150 disposed between the flexible edge member 162 and the support frame 100. The flexible edge member has a groove 170 in which the peripheral edge 92 of the support ring is disposed. In one embodiment, the flexible edge member 162 is overmolded onto the support frame 62 or the peripheral edge 92 of the support ring and may be made of the same material as the membrane 53. In other embodiments, the flexible edge member may be secured to the support frame by friction or by adhesives, mechanical fasteners such as nails or screws, or combinations thereof. The geometry of the flexible edge member 162 further enhances its protective and resilient properties. For example, the flexible edge member 162 may taper from a first thickness T1 along the inner surface 164 toward a second thickness T2 at the outermost peripheral edge of the flexible edge member 162, wherein the thickness is parallel to the inner surface 164 or measured in a generally Z direction. In one embodiment, the nose tapers to a point where T2 = 0. In one embodiment, the cross-section of the flexible edge member 162 has a rounded nose shape. Figure 7B As shown, the flexible edge member 162 can be compressed in response to a load applied in the X and / or Y directions, or deflected in response to a load applied in the Z direction.

[0085] In one embodiment, an auxiliary support member 200, shown as a pad, is disposed between the upper surface 126 of the support frame 100 and the bottom surface 190 of the textile material 150 configured as a suspension material, or within the space defined between the upper surface 126 and the bottom surface 190. When the suspension material is in an unloaded configuration (i.e., the user is not on the suspension material), the upper surface 202 of the auxiliary support member 200 is spaced apart from the bottom surface 190 of the suspension material, such that a gap G2 or space is defined between the upper surface 126 and the bottom surface 190. In various embodiments, the gap G2 may remain constant, wherein the pad has a contoured upper surface 202 that matches the contour of the bottom surface 190 of the suspension material. In various embodiments, the gap G2 is greater than 0 and less than 5 mm, and in one embodiment is 3 mm, such that the suspension material contacts the auxiliary support member 200 once the user engages or sits on it. The auxiliary support member 200 may have a generally trapezoidal shape in plan view, which matches the shape of the central portion 102 of the support frame or the support platform 30. The auxiliary support member 200 extends forward to cover the opening 118 and support the user's thigh. The auxiliary support member may be made of foam. The auxiliary support member 200 can be secured to the support platform 30 and / or the support frame 100 with fasteners, including mechanical fasteners such as screws or adhesives. In one embodiment, the auxiliary support member 200 has a bottom substrate 201, such as plastic or wood, which can be fastened with fasteners and connected to or embedded in the substrate. Figure 20 The upper foam pad 203 is shown.

[0086] During operation, and referring to Figure 18 , Figure 19 and Figure 30 When a user sits on the suspension material 150, the load applied to the suspension material 150 causes the suspension material 150 to deflect downward toward the auxiliary support member 200. If the load causes the suspension material to deflect across a distance G2 and come into contact with the auxiliary support member 200, then the auxiliary support member 200 can absorb additional load and support the user.

[0087] It should be understood that in other embodiments, the auxiliary support member 200 abuts and supports the textile material in an unloaded state. For example, the textile material may simply cover the padding that fills the space of the cavity 132 of the carrier frame, wherein the textile material forms a decorative cover on top of the padding.

[0088] In one embodiment, a method of manufacturing or assembling the body support member 10 includes positioning and securing an auxiliary support member 200 to the top of a carrier frame 100. The method also includes disposing peripheral edge portions 154, 252 of textile materials 150, 234 into peripheral grooves 136, 244 formed in peripheral edge surfaces 130, 246 of the frame, wherein the supports 156, 250 engage one surface of the groove. When the supports 156, 250 are rolled up to be inserted into the groove, suspension material covers the portion of the peripheral edge surfaces 130, 246 located between the groove and the upper (or front) surface 126 (i.e., the first body-facing surface of the frame). The carrier frames 100, 242 are then connected to support frames 62, 236 having flexible edge members 162, 240, for example, secured to the support frames 62, 236 by support rings 48. Conversely, the flexible edge member 162 may first be connected to the carrier frame 100, for example, via the support ring 48, wherein these components are subsequently coupled to the support platform 30. In one embodiment, the flexible edge members 162, 240 are secured to the support frame 62 or support ring 48 by overmolding the flexible edge member 162 onto the peripheral edge 92 of the support frame / support ring. The flexible edge members may be secured in other ways, including with adhesives or mechanical fasteners. For example, thermal energy, or energy applied by radiation or convection, may be applied to the suspension material 150, 234, causing the suspension material to contract and generate tension within the suspension material. Energy may be applied to the suspension material before or after the carrier frames 100, 242 are secured to the support frames 62, 212. Due to the contraction of the suspension material, the suspension material is placed under tension across the opening 134, and the supports 250, 156 are anchored in the grooves 136, 244.

[0089] Backrest assembly:

[0090] Reference Figures 1 to 6 and Figure 7B The backrest assembly 6 includes a backrest frame 210 and a backrest support 212, also referred to as a support frame. The backrest frame is relatively rigid, meaning that it does not substantially flex / bend or otherwise elastically deform during reclining. The backrest frame 210 has a lower portion 214 connected to the rear of the tilt control assembly 18. The lower portion 214, or lower support arm, extends generally horizontally in the longitudinal direction 2' along the central axis of the seating structure. The backrest frame 210 is capable of pivoting rearward relative to the base 12 during reclining.

[0091] In one embodiment, a curved transition portion 216, defining a rearwardly arched shape, extends rearward and upward from a lower portion 214. A pair of laterally spaced uprights 218 extend upward from the transition portion 216. The back frame 210 also includes an upper transverse member 220 that extends between and connects the upper ends of the uprights 218, wherein the transverse member 220, the uprights 218, and the lower portion 214 define a central opening. A back support 212, also referred to as a support frame, is flexible and includes flexural regions 225, 233 that allow the back support 212 to bend and deflect in response to a user reclining in the body support structure. The back support or support frame 212 includes a pair of laterally spaced uprights 222, each upright having a forward-facing arched portion 223 at a first location near the waist region of the back support, wherein each arched portion includes and defines a flexural region.

[0092] A base 224 extends between and connects to the uprights. The back support 212 also includes a lower portion or support arm 226 extending forward from the base, wherein this support arm or lower portion is coupled to a control assembly. The uprights 222 of the back support are coupled to the uprights 218 of the back frame via connectors 228. The back support 212 is pivotable with the back frame 210. In one embodiment, the uprights 218, 222 may be pivotally connected via a mechanical pivot joint, including, for example, a pivoting structure disclosed in U.S. Patent No. 9,826,839, the entire disclosure of which is incorporated herein by reference.

[0093] The back support 212 includes an upper member 230 extending between and connected to the upper ends of the pair of second uprights 222, and a bottom member 224 extending between and connected to the lower ends of the pair of second uprights 222. The upper member 230, the uprights 222, and the bottom member 224 define a central opening 232. Suspension material 234 is stretched across the central opening 232 and secured to the back support 212 in a manner similar to a seat.

[0094] Specifically, such as Figure 7BAs shown, the upper member 230, the bottom 224, and the pair of second columns 222 define a support frame 236 with a peripheral edge 238. A flexible edge member 240 is fixed to the peripheral edges of the upper member 230 and the columns 222, or along a surface of the bottom 224. A carrier frame 242 is coupled to the support frame 236 and includes a peripheral groove 244 extending outward from a peripheral edge surface or face 246, which is horizontally oriented between the front and rear surfaces of the carrier frame, spaced apart from the inner surface or inward-facing face 248 of the flexible edge member 240, and defines a space or gap G between the peripheral edge surface or face 246 and face 248, as disclosed above with respect to the seat assembly. The groove 244 opens outward from the carrier frame 242 along the peripheral edge 246 of the carrier frame 242. The suspension material 234 includes at least one support 250 configured as a ring in one embodiment, the at least one support 250 being secured along a peripheral edge portion 252 of the suspension member, wherein the at least one support is disposed in a groove 244. The support 250 can be held in place by friction alone, without the need for any auxiliary support material such as adhesives. In one embodiment, the support 250 directly engages a surface of the groove 244, such as the front surface, while the fabric engages the rear surface. In this way, similar to the seat, the support engages such a surface of the groove 244 that is closest to the fabric-covered surface of the support frame. In one embodiment, the support 250 is formed as a continuous ring of a fixed length, wherein the support 250 is relatively inelastic and resists elongation along its length, but the support 250 can be flexible and bendable.

[0095] In another embodiment, and referring to Figure 24 and Figure 25The support frame 236 includes a rear wall 800 defining a body surface 802, an outer peripheral edge wall 804 having an outer surface 806, and an inner peripheral edge wall 808, wherein walls 804 and 808 define a forward-facing channel 810. A lip 812 or retaining portion extends laterally inward from the outer peripheral edge wall and, together with the rear wall 800, defines a channel 816, wherein the rear surface of the lip defines an engagement surface 814. The carrier frame 820 has a body and an insertion portion 824, the body having a rear flange 822 defining a rear surface that covers and engages the rear wall, and the insertion portion 824 in one embodiment is defined by a plurality of tabs 825 spaced around the periphery of the carrier frame 820. The insertion portion 824 is received in the channel 816 and engages with the engagement surface 814. The carrier frame 820 also includes a pair of upper and lower lugs 827 aligned with lugs 829 on the support frame 236, wherein fasteners 831 secure the lugs 827, 829 to further connect the support frame 236 and the carrier frame 820. The carrier frame 820 includes a second flange 826 that forms an outwardly facing groove 830 with flange 822 and defines an outer peripheral edge wall 827. The flange 826 extends across a channel 810, wherein an edge 832 is positioned adjacent to and closes the inner peripheral edge wall 808. Tension applied by a textile material configured as suspension material 150 in one embodiment subsequently applies a torque to the carrier frame 820, causing the carrier frame 820 to bear against the bottom surface and engagement surface of the support frame. A flexible edge member 240 is coupled to the outer surface of the peripheral edge wall 804 of the support frame, wherein a lip portion covers the top surface of the support frame. The flexible edge member 240 has an inner surface spaced apart from and facing inwardly towards the peripheral edge wall of the support frame, wherein a gap is defined between the inner surface and the peripheral edge wall 827 of the support frame. A portion of textile material is disposed in this gap, wherein the textile material covers the peripheral edge wall 827 of the support frame and the body-facing surface of the support frame. The peripheral edge of the textile material is secured to a bracket 156, wherein the edge portion of the textile material and the bracket are disposed in a groove 830. The support frame 242 can be secured to the support frame by means of stacked tabs 815, 825 and fasteners 831 including mechanical fasteners and / or adhesives.

[0096] operate:

[0097] During operation, and referring to Figure 18 , Figure 19 , Figure 21 and Figure 26User 101 can sit in body support structure 10. Depending on the user's weight, the amount of deflection of suspension material 150, and the amount of deflection of the side portion of the support / bearing frame connected to the suspension material, the suspension material can engage the upper surface 202 of auxiliary support member 200 or padding 203, which subsequently assists in absorbing the user's load. Essentially, the side portion is capable of deflecting inward by a first amount from a first unloaded configuration to a first loaded configuration in response to a load applied to the elastic material, and essentially defines a first spring to absorb the user's load. The elastic textile material or suspension material 150 connected to the side portion 114 across the opening is capable of deflecting downward by a second amount from a second unloaded configuration to a second loaded configuration in response to a load applied to the elastic textile material or suspension material 150, and defines a second spring to absorb the user's load. In other words, the deflection of the frame or side portion and the deflection of the suspension material work together to provide a first amount of support to the user. When the deflection of the first and second amounts, or the first support amount, causes the elastic material to contact the padding, the padding disposed beneath the textile material engages the elastic material and provides auxiliary support for it, defining a third spring to absorb the user's load. When the side portion 114 is in the first unloaded configuration and the elastic suspension material 150 is in the second unloaded configuration, the upper surface of the padding 203 is spaced apart from the textile material. In this way, the flexible support / bearing frame, the elastic suspension material, and the padding, through the combined suspension material and flexible frame, provide first, second, and third amounts of elastic support to the user engaged with and supported by the textile material. It should be understood that the elastic suspension material 150 is capable of deflecting downward by the first amount in response to the deflection of at least one side portion 114 or both side portions, depending on the location where the load is applied.

[0098] The elasticity and deflection of the side portion 114 primarily function as a function of the deflection of at least one connector 80, 108 extending between the central portion 102 and the support platform 30 and the side portion 114. The connectors 80, 108 extend upward and outward from the central portion and are curved to have an upward-facing concave surface, making the connectors 80, 108 rigid and resistant to outward / downward deflection / deformation. As described above, the connectors 80, 108 include a pair of opposing side connectors capable of deflecting inward from a first unloaded configuration to a first loaded configuration in response to a load applied to the elastic material.

[0099] User 101 can recline, wherein the tilt control component 18 moves the seat assembly 8 and / or backrest assembly 6 backward by pivoting, rotating, translating or a combination thereof, for example by a four-bar linkage including links 8, 23, 25 and 33.

[0100] Reference Figure 18 , Figure 19 and Figure 21 When the seat assembly 8 tilts or leans back, the support platform 30 and the carrier frame 100 flex or bend around the flexure regions 53 and 153, causing the rear portion 121 of the seat assembly and the rear portion of the support platform to rotate or deflect downwards relative to the front portion 123 of the seat assembly and the front portion of the support platform around the flexure regions. Simultaneously, due to the geometry of the seat assembly, including the configuration of the outer ring 104, the geometry of the connector 108, the concavity of the carrier frame 100, and the configuration of the openings 109 and 119, the intermediate connector 108 flexes or bends upwards around the flexure region 155, causing the side members 114 of the outer ring 104 to move upwards relative to the support platform and inwards toward each other to a new configuration or shape of the side members 114', wherein the textile material 150 is assumed to be a more concavely constructed textile material 150' that slightly suspends and holds the user. With the deflection of the connector 108 and the outer ring 104, the total length of the outer ring 104 remains unchanged and does not increase. It should be understood that the upward movement of the side member 114 is relative to the support platform 30, while a portion of the support platform 30 can move downward, making the overall or absolute movement of the side member relative to the ground negligible. The support ring 48 is sufficiently flexible and compliant that it does not interfere with the deflection of the support frame 100, but rather provides a decorative tactile surface covering the bottom surface of the support frame. If desired, the support ring 48 may also be provided with deflection areas to allow such deflection. Due to the geometry of the seat assembly, including the configuration of the outer ring 104, the geometry of the curved connector 108 (e.g., upward concavity), the concavity of the support frame 100, and the configuration of the openings 109, 119, the side member 114 and the connector 108 are relatively rigid and resist / avoid downward deformation in response to downward loads applied along the sides of the seat at the perimeter of the chair.

[0101] Due to the orientation of the front and rear links, and the relative positions of the flexural regions 27 and 53 located above and in front of flexural regions 29 and 31, respectively, the four-bar linkage provides a weight-activated system, meaning that the user's weight is taken into account when leaning, as the increase in potential energy is offset by the kinetic energy required for leaning. In this way, the four-bar linkage will provide more resistance for heavier users and automatically balance the user. As previously mentioned, the amount of leaning can be limited by a lean limiter, while energy can be supplied to increase the resistance to leaning the body support assembly and returning it to its nominal upright position.

[0102] Although the invention has been described with reference to preferred embodiments, those skilled in the art will recognize that changes in form and detail may be made without departing from the spirit and scope of the invention. Therefore, the foregoing detailed description is intended to be illustrative rather than restrictive, and the appended claims, including all their equivalents, are intended to define the scope of the invention.

Claims

1. A seating assembly, comprising: A lower support platform extending in a longitudinal direction and including opposite side edges and a laterally extending first flexural region extending between the opposite side edges, wherein the first flexural region branches the lower support platform into a front and a rear portion, wherein the first flexural region is bendable, allowing the rear portion to deflect downward relative to the front portion; and The upper shell includes opposing side members connected to the support platform via a pair of connectors, each of the connectors including a second flexural region, wherein the second flexural region is bendable such that when the rear portion is deflected downward relative to the front portion, the opposing side members are movable upward and / or inward relative to the lower support platform.

2. The seat assembly according to claim 1, wherein, The upper shell defines a concave cavity and includes an outer ring defining a central opening, wherein the side members at least partially define the outer ring.

3. The seat assembly according to claim 1, further comprising a suspension material, the suspension material being fixed to the outer ring of the upper shell across the central opening, wherein, The suspension material covers the concave cavity.

4. The seat assembly according to claim 3, wherein, The upper shell includes a groove extending around at least a portion of the outer ring, wherein the peripheral edge of the suspended material is disposed in the groove.

5. The seat assembly of claim 4, further comprising at least one bracket, said at least one bracket being coupled to the peripheral edge of the suspension material, wherein, The at least one bracket is disposed in the groove.

6. The seating assembly of claim 5, further comprising a support ring and a flexible edge member, the support ring surrounding the lower support platform and extending radially outward from the lower support platform, wherein, The support ring defines a second peripheral edge, and the flexible edge member is coupled to the second peripheral edge of the support ring, wherein the flexible edge member is disposed along the peripheral edge of the outer ring and covers the groove.

7. The seat assembly of claim 3 further includes a pad disposed between the upper surface of the upper shell and the bottom surface of the suspension material.

8. The seat assembly according to claim 7, wherein, The upper surface of the pad is spaced apart from the bottom surface of the suspension material.

9. The seat assembly according to claim 1, wherein, The lower support platform has a generally trapezoidal shape, which has a rear edge shorter than the front edge and opposite side edges that connect the front edge and the rear edge.

10. The seat assembly according to claim 1, wherein, The upper shell includes a central portion and an outer ring, the central portion covering the lower support platform, and the outer ring partially defining the opposite side members, wherein the outer ring and the central portion of the upper shell are connected to a pair of connectors.

11. The seat assembly according to claim 1, wherein, The second flexural region is capable of bending such that when the rear portion can deflect downward relative to the front portion, the opposite side members can move inward toward each other.

12. The seat assembly according to claim 10, wherein, The outer ring maintains a fixed length when the opposite side member is able to move upward and / or inward relative to the lower support platform.

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