Patent Application
20210204699
The present application relates generally to a body support assembly, for example a chair, and in particular to a backrest assembly and/or seat assembly incorporated into the body support assembly, and various components incorporated therein, together with methods for the use and assembly thereof.
Chairs, and in particular office chairs, may have a body support member configured with a suspension material, such as a mesh fabric, that is stretched across a frame. Such suspension materials conform to the body of the user, providing micro compliance along with improved air circulation, and the attendant cooling benefit. Typically, the frame must be rigid in order to maintain an appropriate level of tension in the suspension material. Such rigidity may limit, however, the flexibility of the body support member, and introduce unforgiving pressure points around the perimeter of the frame. In addition, suspension materials installed on a seat of a chair are typically required to sustain higher tensions due to the load being applied thereto by a seated user, which may exacerbate the limited flexibility and rigidity of the supporting structure.
While various mechanical systems, such as lumbar supports and tilt control mechanisms, may be introduced to mitigate the limited flexibility and provide additional adjustment capabilities, such systems are relatively expensive to manufacture, require additional maintenance, are susceptible to wear and tear over time, and may not be appropriately exploited by the user due to the requirement for individual adjustments. In addition, such tilt mechanisms typically include one or more rigid links, and mechanical connections, which are rigid and non-compliant, which result in a more rigid and less forgiving ride, and which may lead to a less desirable user experience. Conversely, systems relying on the materiality of the seating structure to introduce the appropriate kinematics and flexibility may not be suitable to support a suspension material. While body support surfaces may be defined by one or more foam cushions, foam materials may limit air circulation and often do not provide localized support. In addition, body support members configured with plastic shells, supported for example by peripheral frames, typically do not provide a comfortable body-conforming support surface.
The present invention is defined by the following claims, and nothing in this section should be considered to be a limitation on those claims.
In one aspect, one embodiment of a 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 the first peripheral edge of the lower support platform and extends radially outwardly therefrom and defines a second peripheral edge. The support ring includes an upper surface. An upper shell is disposed over the upper surfaces of the lower support platform and the support ring and defines a concave cavity. The upper shell has a third peripheral edge defining a central opening and an upper surface. A suspension material is secured to the upper shell across the central opening and covers the concave cavity.
In another aspect, one embodiment of a body support member includes a carrier frame having a body facing first surface, a second surface opposite the first surface, a peripheral edge surface extending between the first and second surfaces, and a peripheral groove formed in and opening outwardly from the peripheral edge surface. A support frame includes a first surface and a 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. The inner surface and the peripheral edge surface define a gap therebetween, with the gap being in communication with the peripheral groove. A textile material includes a 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.
In another aspect, one embodiment of a method of manufacturing a body support member includes disposing a peripheral edge of a textile material into a groove formed in a peripheral edge surface of a carrier frame, covering at least a portion of the peripheral edge surface and a body-facing first surface of the carrier frame with the textile material, and connecting a flexible edge member to the carrier frame. The flexible edge member has an inner surface spaced apart from and facing the peripheral edge surface of the carrier frame, wherein the inner surface and the peripheral edge surface define a gap therebetween, wherein the gap is in communication with the peripheral groove, and wherein the textile material is disposed in the gap.
In another aspect, one embodiment of a seat assembly includes a lower support platform extending in a longitudinal direction. The lower support platform includes opposite side edges and a laterally extending first flex region extending between the opposite side edges that bifurcates the lower support platform into a front portion and a rear portion. The first flex region is bendable such that the rear portion is downwardly deflectable relative to the front portion, even though both the front and rear portions may move upwardly during recline in one embodiment. An upper shell includes opposite side members connected to the support platform with a pair of connectors. Each of the connectors includes a second flex region, wherein the second flex regions are bendable such that the opposite side members are upwardly moveable relative to the lower support platform as the rear portion is downwardly deflectable.
In another aspect, a body support member includes a carrier frame having a central portion and a peripheral ring connected to the central portion with a plurality of connectors each having a flex region, with the peripheral ring defining a central opening. An elastic textile material is coupled to the peripheral ring across the central opening. A cushion is disposed between the central portion and the textile material. At least one the plurality of connectors is inwardly deflectable 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 downwardly deflectable a second amount from a second unloaded configuration to a second loaded configuration in response to the load applied thereto. The cushion engages and provides auxiliary support to the elastic material when the first and second amounts of deflection result in the elastic material contacting the cushion.
In another aspect, one embodiment of a body support member includes a flexible carrier frame deformable from an unloaded configuration to loaded configuration, an elastic textile material coupled to the carrier frame, and a cushion disposed beneath the textile material. The flexible carrier frame, elastic material and cushion provide first, second and third amounts of resilient support to a user engaging and supported by the textile material.
In another aspect, one embodiment of a body support member includes a carrier frame having opposite side portions defining an opening therebetween. An elastic textile material is coupled to the side portions across the opening, with a cushion disposed beneath the textile material. At least one of the side portions, and preferably both side portions, are inwardly deflectable 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 downwardly deflectable a second amount from a second unloaded configuration to a second loaded configuration in response to the load applied thereto, and the cushion engages and provides auxiliary support to the elastic material when the first and second amounts of deflection result in the elastic material contacting the cushion.
In another aspect, one embodiment of a body support assembly includes a base member and a lower support structure having a longitudinally extending portion coupled to the base member at a first location, a front link extending upwardly from the longitudinally extending portion forwardly of the first location, and a rear link extending upwardly from the longitudinally extending portion rearwardly of the first location. A back frame includes a first lower portion extending rearwardly from the rear link and an upright portion extending upwardly from the lower portion. A seat support member is coupled to the front link and to the rear link, wherein the seat support member supports a seating surface. A back support is pivotally connected to the upright portion at a second location above the seating surface and includes a second lower portion connected to the rear link below the seat support member.
In another aspect, one embodiment of a backrest assembly includes a base and a rigid back frame having a first upright portion and a first lower portion extending forwardly from the first upright portion and coupled to the base. The first lower portion is reclinable relative to the base about a first flex region. A flexible back support includes a second upright having a second flex region proximate a lumbar region of the back support, wherein the second upright is flexible about the second flex region, and a second lower portion extending forwardly from the second upright and coupled to the first lower portion. The second lower portion is reclinable with the first lower portion relative to the base about the first flex region. The second lower portion has a third flex region located between the first and second flex regions, wherein the second lower portion is flexible about the third flex region, and wherein the second upright is pivotally coupled to the back frame at a third location spaced above the second flex location.
In another aspect, one embodiment of a body support assembly includes a base member and a lower support structure including a longitudinally extending portion coupled to the base member at a first location, the longitudinally extending portion defining a first flex region positioned rearward of the first location. A front link extends upwardly from the longitudinally extending portion forwardly of the first location, wherein at least one of the lower support member and the front link define a second flex region positioned forward of the first location. A rear link extends upwardly from the longitudinally extending portion rearward of the first location. A seat support member is coupled to the front link and to the rear link, wherein the seat support member supports a seating surface. At least one of the seat support member and the front link define a third flex region and the seat support member defines a fourth flex region adjacent the rear link. A rigid back frame extends upwardly and rearwardly from the lower support structure, wherein the rigid back frame is rigidly connected to the rear link. A flexible back support includes an upper portion pivotally connected to the rigid back frame at a second location vertically spaced above the seat support and a lower portion rigidly connected to the rear link. The flexible back support has a fifth flex region located between the seat support and the second location and a sixth flex region located between the fifth flex region and the rear link.
In another aspect, one embodiment of a backrest assembly includes a back frame including a pair of first uprights and a back support includes a pair of second uprights, each of the second uprights positioned laterally outboard of one of the first uprights. A body support member is coupled to the back support. A pair of connectors extend laterally between one of the first uprights and one of the second uprights, wherein each of the connectors includes a first connector tab extending laterally from one of the first uprights and a second connector tab extending laterally from one of the second uprights, wherein the first and second connector tabs are overlapping.
In another aspect, one embodiment of a backrest assembly includes a back frame having a first upright and a back support having a second upright laterally spaced from the first upright. A body support member is coupled to the back support. A connector tab extends laterally from one of the first or second upright and includes a laterally extending and non-cylindrical insert portion received in a socket formed in the other of the first or second upright. The insert portion is rotatable about a laterally extending axis relative to the socket between at least first and second pivot positions, wherein the insert portion engages first and second stop surfaces of the socket when the insert portion is in the first and second positions respectively.
In another aspect, one embodiment of a support structure for a body support member includes a lower support member having an upwardly extending first post, a backrest frame having an upwardly extending second post, and a seat support having a downwardly extending boss structure coupled to the first and second posts.
In another aspect, one embodiment of a body support assembly includes a seat having opposite sides spaced apart in a lateral direction and a front and rear spaced apart in a first longitudinal direction. A back support has opposite sides spaced apart in the lateral direction and a top and bottom spaced apart in a second longitudinal direction. A support structure supports the seat at a pair of laterally spaced front locations and a central rear location, wherein the rear of the seat is rotatable relative to the front of the seat about a first longitudinal axis. The support structure supports the back support at a pair of laterally spaced upper locations and a central lower location, wherein the bottom of the back support is rotatable relative to a top of the back support about a second longitudinal axis. In one embodiment, the seat and the back support are coupled to a central rear link at the central rear location and the central bottom location respectively.
In another aspect, one embodiment of a body support assembly includes a body support member reclinable relative to a base. A recline limiter assembly interfaces between the body support member and the base to limit the recline of the body support member relative to the base. The recline limiter assembly includes a recline limiter having at least two rotational degrees of freedom.
In another aspect, one embodiment of a body support assembly includes a body support member rearwardly reclinable relative to a base. The body support member has a front and a rear spaced apart in a longitudinal direction. A recline stop member includes a first end connected to the body support member and a second end defining a stop portion. A recline limiter includes at least first and second longitudinally spaced stop surfaces, wherein the plurality of stop surfaces are angularly spaced about a longitudinal axis. The recline limiter is rotatably mounted to the base about the longitudinal axis, and is rotatable about the longitudinal axis between a first position, wherein the stop portion engages the first stop surface, and a second position, wherein the stop portion engages the second stop surface.
In another aspect, one embodiment of a body support assembly includes a lower base and a seat support connected to the lower base with an extensible support column having an actuation button. A handle is rotatable about a first lateral axis. A drive gear is connected to the handle and is rotatable about the first lateral axis from a non-engaged configuration to an engaged configuration. The drive gear includes a first plurality of teeth. A driven gear is rotatable about a second lateral axis spaced apart from the first lateral axis. The driven gear includes a second plurality of teeth, wherein the first and second pluralities of teeth are not engaged when the drive gear is in the non-engaged position. The drive gear is rotatable to the engaged configuration whereinafter the first plurality of teeth are brought into engagement with the second plurality of teeth after a first predetermined amount of rotation of the handle about the first lateral axis. The driven gear is rotated from a non-actuated position to an actuation position about the second lateral axis when the drive gear is in the engaged configuration. An actuator is coupled to the drive gear, wherein the actuator is rotatable into engagement with the actuation button as the driven gear is rotated to the actuation position.
In another aspect, one embodiment of a backrest assembly includes a backrest frame having first and second laterally spaced uprights defining a central opening therebetween. Each of the first and second uprights has upper and lower portions defining separate first and second forwardly facing convex curvatures. A cross member extends between and is coupled to the uprights at the junction between the upper and lower portions. A suspension material is connected to the first and second uprights and spans across the central opening. The suspension material has a front surface and a rear surface, wherein at least opposite side portions of the suspension material have first and second forwardly facing convex curvatures. A laterally extending stay is coupled to and extends between the rear surface of the suspension material and the cross member.
In another aspect, on embodiment of an armrest assembly for a seating unit includes an armrest support adapted for attachment to a seating unit and including an upper support platform. An armrest pad is adapted to support a person's arm and includes laterally spaced and downwardly extending rim portions positioned along opposite sides of the armrest pad. A pair of swing arms each have a first end pivotally connected to the upper support platform at spaced apart first locations and a second end pivotally and slidably connected to the armrest pad at spaced apart second locations. The swing arms adjustably support the armrest pad for independent longitudinal, lateral, and rotational adjustment. At least one of the rim portions engages at least one of the swing arms to limit inboard and/or outboard lateral movement of the armrest pad relative to the support platform.
Various methods of using and assembling the body support assembly and other components are also provided.
The various embodiments of the body support assembly and components, and methods for the use and assembly thereof, provide significant advantages over other body support assemblies and methods. For example and without limitation, the structure allows for the integration of a suspension material into the backrest and/or seat, while maintaining an overall flexibility of those components. The structure and user interface provide a body support structure that adapts to the user's body and provides for macro compliance during use, while also providing micro compliance at the user interface and avoiding hard interfaces around the periphery thereof.
In addition, the various links and flex regions provide a simple but robust structure that ensures a proper fit for a multitude of users without the requirement of complex mechanical mechanisms and adjustment interfaces. The body support assemblies, with their various flex regions and material compliance, provide for improved comfort and fit, while reducing costs by reducing and/or eliminating the overall number of parts, including various metal components, which may reduce manufacturing costs. In addition, the compliant materials may reduce the overall weight of the body support assembly, and the attendant shipping costs associated therewith. The body support assembly is uncomplicated, durable, visually appealing and capable of a long operating life. At the same time, various components are ideally suited for interfacing with the compliant seating structure, including for example and without limitation the floating recline limiter that accommodates the movement of a body support member relative to a base.
The armrest also provides significant advantages, with the rim of the pad limiting inboard and outboard movement, such that the underlying platform remains obscured during lateral movement, thereby improving the aesthetics of the armrest.
The disclosed backrest also provides significant advantages, for example and without limitation, providing for a single piece of suspension material to cover a frame having a plurality of separate convex curvatures. The stay allows for the suspension material to conform to the backrest, while pulling it rearwardly to provide a conforming shape and pleasing aesthetic appearance.
The foregoing paragraphs have been provided by way of general introduction, and are not intended to limit the scope of the claims presented below. The various preferred embodiments, together with further advantages, will be best understood by reference to the following detailed description taken in conjunction with the accompanying drawings.
It should be understood that the term “plurality,” as used herein, means two or more. The term “longitudinal,” as used herein means of or relating to a length or lengthwise direction 2, 2′, for example a direction running from the bottom of a backrest assembly 6 to the top thereof, or vice versa, or from the front of a seat assembly 8 to the rear thereof, or vice versa. The term “lateral,” as used herein, means situated on, directed toward or running in a side-to-side direction 4 of a body support assembly 10, shown in one embodiment as an office chair including the backrest assembly 6 and seat assembly 8. It should be understood that the body support assembly may be configured as any structure that supports a body, including without limitation automotive, aircraft and mass-transit seating, beds, home furnishings (including sofas and chairs), and other similar and suitable structures. In one embodiment of a backrest assembly disclosed below, a lateral direction 4 corresponds to a horizontal direction and a longitudinal direction 2 corresponds to a vertical direction, while in one embodiment of a seat assembly, the longitudinal direction 2′ corresponds to a horizontal direction. The lateral direction 4 may be referred to as an X direction, while the longitudinal direction 2, 2′ refers to a Y direction and a Z direction is orthogonal to the body support surface of both the backrest and seat assemblies 6, 8.
The term “coupled” means connected to or engaged with, whether directly or indirectly, for example with an intervening member, and does not require the engagement to be fixed or permanent, although it may be fixed or permanent. The terms “first,” “second,” and so on, as used herein are not meant to be assigned to a particular component so designated, but rather are simply referring to such components in the numerical order as addressed, meaning that a component designated as “first” may later be a “second” such component, depending on the order in which it is referred. It should also be understood that designation of “first” and “second” does not necessarily mean that the two components or values so designated are different, meaning for example a first direction may be the same as a second direction, with each simply being applicable to different components. The terms “upper,” “lower,” “rear,” “front,” “fore,” “aft,” “vertical,” “horizontal,” “right,” “left,” and variations or derivatives thereof, refer to the orientations of an exemplary body support assembly 10, shown as a chair in
The term “textile material” refers to a flexible material made of a network of natural or artificial fibers (yarn, monofilaments, thread, etc.). Textile materials may be formed by weaving, knitting, crocheting, knotting, felting, or braiding. Textile materials may include various furniture upholstery materials, which may be used for example to cover a foam cushion, and/or suspension materials, which may be stretched or put in tension across an opening to support a user.
Referring to
In the embodiment of
Referring to
The base portion 302 includes a pair of laterally extending arms 304 disposed between and extending laterally outwardly (vector having portion along axis 4) and rearwardly (vector having portion along axis 2′) from the lower support structure 18 and the seat assembly 6, including a seat support member 308, and defining an angle α relative to the lateral direction 4 as shown in
Referring to
An armrest pad 318 is adapted to support a person's arm is coupled to the support platform. The armrest pad 318 has a base 320 with laterally spaced and downwardly extending rim portions 322 positioned along opposite sides of the armrest pad. In one embodiment, the rim portion 322 extends around an entire periphery of the base 320. The base 320 is preferably configured as a plastic plate. A pair of swing arms 324, 326 are provided, with each swing arm having a first end 328, 330 pivotally connected to the upper support platform with a pair of fasteners 332, configured as a screws with washers, that engage openings at spaced apart first locations 334, 336. The locations are spaced apart along the longitudinal axis 317. The swing arms 324, 326 each have a second end 338, 340 pivotally and slidably connected to the armrest pad 318 with a pair of upwardly extending boss structures 342, 344, or studs, having ends engaged by fasteners 350, 352 at spaced apart second locations 346, 348, which move relative to the first locations. The second location 342 is spaced forwardly of the first location 334 while the second location 348 is space rearwardly of the first location 344 when the arm pad is in a nominal position as shown in
As shown in
The armrest pad includes a plate 368, preferably steel, having a longitudinal track 370 running along the bottom of the plate 368 and formed by a raised portion of the plate. The track 370 defines a channel overlying the fasteners 350, with a width and depth dimensioned to accommodate the fasteners 350 within the channel and thereby allowing slidable movement of the arm cap 318 in a longitudinal direction 317 as the bosses 342, 344 move in the slots 364, 366 and the fasteners 350 move in the track 370. The plate 368 is coupled to the base 320 with a plurality of fasteners 391, shown as six, with the fasteners 350 trapped between the base 320 and plate 368 and moveable in the recesses 365, 367 and the track 370. The interaction between the rotatable swing arms 324, 326 and the slideable/translatable armrest pad 318 allows the armrest pad 318 to be moved to a number of different positions relative to the support platform 314. In particular, the armrest pad 318 is moveable from a nominal position, designated as armrest pad 318′, to an infinite number of positions, including: (1) maximum inwardly turned angles Θ, (e.g. 31.5 degrees in one embodiment) at rear and forward location (
In operation, the fasteners 350, or guides 351, are moveably disposed in the track 370 between the plate 368 and base 320, such that the plate 368 and base 320 are slidable relative to the support platform 314 as shown in
The downwardly extending rim 322, which acts as a stop that engages the sides 354, 356 of the swing arm(s) to limit the amount of side-to-side travel, prevents the platform 314 and swing arms 324, 326 from being exposed to view during use. As shown in
Referring to
In other embodiments, the tilt control assembly include integrally formed links 23, 25, 33, configured for example with strategic deformable locations that allow for predetermined deformations and define “flex regions,” otherwise referred to as “flex joints,” or virtual pivot locations. The various configurations of the links and flex regions may be configured as shown and disclosed in U.S. Pub. No. 2016/0296026 A1, entitled “Seating Arrangement,” and in U.S. Pub. No. 2018/0352961, entitled “Seating Arrangement and Method of Construction,” the entire disclosures of which are hereby incorporated herein by reference.
For example, the tilt control assembly 318 may be configured as a four-bar mechanism as shown in
In one embodiment, and referring to
The pair of laterally spaced front links 23 extend upwardly and forwardly from the longitudinally extending portion 400 at a location 408 positioned forwardly of the first location 406. The front links 23 have a maximum lateral width (W1), defined by the laterally spaced outboard edges thereof, as shown in
The lower support structure may be referred to as a lower shell, with the longitudinally extending portion 400, front link 23, and in one embodiment a portion of the rear link 25, defining an integrally formed structure, which define in turn two or three integrally formed bars (or portions thereof) of the four bar linkage. The lower support structure 400 has strategically positioned tensile substrates 1220, 1222 (shown in
For example, as shown in
The rear link 25 is relative rigid or stiff, meaning the rear link does not bend or deform elastically during rearward recline of the body support assembly. Rather, the longitudinally extending portion 400 has a thinner region defining a flex region 31 immediately adjacent to and in front of the rear link 25 and the location 410, but rearward of the first location 406. As with flex region 28, the flex region 31 is defined by a thin and flat cross section, shown in
The rear portion 401 of the lower support structure 400 extends rearwardly from the first location 406 and includes an upwardly extending centrally located arm or post 407 defining in part the rear link 25, and a flange 409 on each side of the post defining a rear edge 416 as shown in
In operation, a user can move or recline the backrest and seat assemblies 6, 8 from an upright position to a reclined position by flexing the four bar mechanism, including portions of the seat assembly. It is contemplated that the four-bar linkage arrangement as used and described herein is inclusive of linkage arrangements comprising additional linkage members, such as five-bar linkage arrangements, six-bar linkage arrangements, and the like. In various embodiments, the thickness of one or more links 23, 25, 33, 57, and especially the front, base and seat links 23, 33, 57, and predetermined flex regions thereof, may be located to achieve a desired performance characteristic, including for example, the flexibility of the link. Further, in certain embodiments, the thickness of a link may vary along the length and/or width of the link to achieve a desired flexibility or rigidity across the link or in a localized portion of the link, for example at flex regions 27, 28, 31 and 53. In addition, and for example, the front links and seat assembly link may be more flexible than the rear link 25 to achieve the desired flexibility of the four-bar linkage. In some embodiments, the various links may be more flexible in a particular portion or localized area of the link such that the links are generally flexible in the localized area and are generally not flexible or less flexible in any other area of the link. It is noted that the relative areas of reduced thickness may extend along a short distance or the majority of the length of the associated link depending upon the support and bending characteristics desired.
The spacing W1 between the outermost portions of the front links 23 support provides relative stability to the front portion of the seat, with the links 23 thereby resisting rotation or torsional movement about the longitudinal axis 2. In contrast, the centrally located rear link 25 having an overall width W3 is the only support for the rear of the seat assembly, which allows for a greater amount of rotation or torsional movement of the rear of the seat about the longitudinal axis 2 relative to the front of the seat, with the rotation or torsional movement of the front of the seat being restricted by the front links 23. In one embodiment, W1 is about 290-300 mm, while W3 is about 140 mm, with the ratio between W1 and W3 being about 2:1.
Referring to
The control module 420 includes a housing 422, having a base 426, made from a casting in one embodiment. A ball retainer housing 428 is made of two pieces, which are connected to defining a spherical interior socket 424. A cover 421, or base portion 302 of the armrest assembly, is secured to the top of the base 426 with fasteners 505 to further define the housing 422. The retainer housing 428 is inserted into the base 426 beneath a shroud 516 formed in the housing, wherein it is secured with a shaft 462. The housing 422, or hub portion 405 thereof, defines an opening 503 in a bottom wall thereof that receives a top of the support column 16, with the housing 422 fixedly secured to the platform 402, for example with fasteners 505. A ball shaped recline limiter 430, configured in one embodiment as a spherical bearing, is rotatably supported in the socket 424 of the ball retainer housing. The recline limiter 430 is rotatable relative to the housing 428 about a longitudinal axis 432. A recline stop member 434, configured with a rod 436, or portion of a T-shaft, being axially disposed through a spring bushing 438 and spring 446. A cross member 440 of the T-shaft moves in a longitudinal slot 442 formed in the side walls of the spring bushing. The ends of the cross member 440 extend radially outwardly from the sides of the spring bushing such that the ends are exposed for engagement with various stop surfaces of the recline limiter. The spring bushing 438 has a first end 448 coupled to a tension spring 446, for example with a threadable engagement. The spring bushing 438 includes a pair of tabs 444 extending radially outwardly from opposite sides thereof. In this way, the ends of the cross member 440 and the tabs 444 on the spring bushing define different stop members, which engage different stop surfaces 450, 452, 454 formed interiorly in, or along a forward end/front surface of, the spherical bearing, or recline limiter. The surfaces 450, 452 and 454 are spaced apart in a longitudinal direction, with the surface 450 being a forwardmost surface and the stop surface 454 being a rearwardmost surface. The surface 452 may be defined as the forward end surface of the ball shaped recline limiter, or may be spaced longitudinally reawardly of such a surface so as to provide contact with the tabs 444 of the spring bushing 438 during all operations of the limiter. The recline limiter 430 includes a through opening 453, with the spring bushing 438 and stop member rod 436 extending through the opening, and with the rod 436 extending through a longitudinal center of the spring bushing 438 and spring 446, which are disposed around the rod 436. In the embodiment shown in
In operation, the recline limiter 430 is rotated at 30 degree increments about the longitudinal axis 432 defined by the spring bushing 438, spring 446 and T-rod 436 to present the different stop surfaces 450, 452, 454 to the ends of the cross member 440 and/or tabs 444 of the spring bushing. In one embodiment, an actuator component 460 includes a hub portion 472 having a through opening engaged by a shaft 462 having a lead screw 464 with threads 481. As shown in
In a full recline/full boost position, shown in
In a no-recline stop position, shown in
In a full recline/no boost position, shown in
In a mid-recline/mid-boost position, shown in
Importantly, the interface between the socket 424 of the ball retainer housing 428 and the outer spherical surface of the recline limiter 430 allows the position of the recline limiter 430 to be adjusted to the different stop/boost positions, but also allows for some play/rotation to accommodate the rotation of the rod and other components during recline. For example, the intermeshing racks 474, 476, and teeth defined thereby, are oriented such that the recline limiter 430 may rotate about a lateral, horizontal axis. In one embodiment, the recline limiter, or spherical bushing, has at least two rotational degrees of freedom, including for example rotation of the recline limiter about the longitudinal axis 432 and also about the lateral axis, so as to allow the recline limiter to float relative to the base and thereby accommodate the flexing of the four bar mechanism about a lateral axis and any inherent flexing of the seat and back about a longitudinal axis without being bound up in the housing 428. The recline limiter may also have a rotational degree of freedom allowing rotation about an axis orthogonal to the longitudinal and lateral axis, for example an axis extending upwardly, such that the rod 436 may rotate side-to-side to accommodate movement, i.e., bending and twisting, of the four bar mechanism during use.
As noted, the recline limiter assembly interfaces between a body support member, e.g., seat and/or backrest, and the base to limit the recline of the body support member relative to the base. For example, the recline limiter assembly may interface between the rear link 25 and the base 12, with the rear link coupled to both the seat and backrest and controlling the recline of both components through the rear link 25. In other embodiments, the recline limiter may be directly coupled to, or interface directly with, either the seat or backrest assemblies 8, 6.
The control module may also include an actuator 484 coupled to the housing 422 for moving an actuator button 501 extending from a top of support column 16. The actuator button may be depressed by the actuator 484, thereby allowing the support column 16 to extend, or to be compressed under load. Referring to
An actuator with a driven gear 500, 1500 is positioned adjacent the drive gear and is rotatable about a lateral axis 502 spaced from the lateral axis 488. A bushing or cover 847 surrounds an axle 841 extending from the driven gear 1500, which is supported by a pair of lugs 853 formed on the housing 422. The engagement member rotates about the axle 841 and/or cover 847 between the lugs. In one embodiment, the driven gear 1500 is configured as a gear segment, with a pair of radii sides 1502 and an outer circumferential arc 1504 having a plurality of teeth 1506 positioned around the periphery thereof. The actuator includes a tab or lever 504 extending radially from the axle overlying the actuation button of the support column. A compression spring 506 biases the drive gear 494 such that the no-teeth portion 498, or surface 499, typically overlies the driven gear. The driven gear 500 includes a plurality of teeth 508 disposed around at least a portion of the circumference of the driven gear, with the recess 498 or surface 499 overlying the plurality of teeth 508 when the drive gear is in the non-engaged position. The drive gear 494 is rotatable to the engaged position such that the plurality of teeth 496 are brought into engagement with the plurality of teeth 508 after a first predetermined amount of rotation of the handle 486 about the lateral axis 488. The driven gear 500 is thereby rotated from a non-actuated position to an actuation position about the lateral axis 502 when the drive gear is in the engaged position. The user rotates the handle 486 against the biasing force of the compression spring 506 until the teeth 496 of the drive gear rotate into engagement with the teeth 508 of the driven gear, thereby rotating the actuator lever 504 extending from the shaft of the driven gear and actuating the button 517 on the top of the support column 16. An integrated spring 510 is formed in a carrier bracket to provide a slight-preload to the button. The driven gear 500 is rotatably supported by a bracket 512 coupled to the top of the housing over the top of the support column, with the drive gear and driven gear interfacing in recess 514 formed in the housing.
Referring to the embodiment of
The drive gear 1494 is rotatable to the engaged position such that the plurality of teeth 1496 are brought into engagement and intermeshed with the plurality of teeth 1506 after a first predetermined amount of rotation of the handle 486 about the lateral axis 488. The driven gear 1500 is thereby rotated from a non-actuated position to an actuation position about the lateral axis 502 when the drive gear is in the engaged position. The user rotates the handle 486 against the biasing force of the spring 960 until the teeth 1496 of the drive gear rotate into engagement with the teeth 1506 of the driven gear, thereby rotating the actuator lever 504 extending from the shaft of the driven gear and actuating the button 517 on the top of the support column 16.
Referring to
The support platform 30 has a pair of laterally spaced pads 44 positioned at a forward portion of the support platform. As shown in
The support platform may be made of a flexibly resilient polymer material such as any thermoplastic, including, for example, nylon, glass-filled nylon polypropylene, acetyl, or polycarbonate; any thermal set material, including, for example, epoxies; or any resin-based composites, including, for example, carbon fiber or fiberglass, thereby allowing the support platform to conform and move in response to forces exerted by a user. Other suitable materials may be also be utilized, such as metals, including, for example, steel or titanium, plywood; or composite material including plastics, resin-based composites, metals and/or plywood. The support platform may have strategically positioned tensile substrates 1220, 1222, made for example of glass reinforced tape, to accommodate bending and deformation of the structure, with the tape being put in tension during such bending and deformation. Strategic locations on the lower support platform also are provided with specific geometries that allow for predetermined deformations and define “flex regions,” otherwise referred to as “flex joints,” or virtual pivot locations.
For example, the support platform may include an area of reduced thickness defining a laterally extending flex region or flexing zone 53 located in front of the boss structure 49, which divides or bifurcates the support platform into front and rear portions, which may have different lengths or dimensions, with the rear portion being downwardly deflectable relative to the front portion during recline as the flex region bends. The portion of the support platform extending between the flex region 53 and the flex region 27 defines a link of a four-bar mechanism, while a portion of the support platform rearward of the flex region 53 defines in part a portion of the rear link 25. It is noted that the relative areas of reduced thickness may extend along a short distance or the majority of the width of the support platform depending upon the support and bending characteristics desired. The phrase “flex region” refers to a portion of the structure that allows for flexing or bending in the designated region, thereby allowing or providing for relative movement (e.g., pivoting) of the component or structure on opposite sides of the flex region, thereby defining a virtual pivot location, for example a horizontal pivot axis, with the understanding that the virtual pivot axis may move during the flexing, rather than being defined as a hard fixed axis. The various configurations and materials of the support platform may correspond to the configuration and materials of various components as shown and disclosed in U.S. Pub. No. 2016/0296026 A1, entitled “Seating Arrangement,” and in U.S. Pub. No. 2018/0352961, entitled “Seating Arrangement and Method of Construction,” the entire disclosures of which are hereby incorporated herein by reference.
A support ring 48 has an inner ring 50 with an interior peripheral edge 52 that defines a central opening 54. The interior peripheral edge 52 surrounds and is coupled to the outer peripheral edge 32 of the support platform, namely the rear edge 40, front edge 38 and side edges 42, of the support platform 30, which is received in the opening 54. 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 interior peripheral edge 52 may be stepped, meaning a peripheral edge portion 70 thereof is thinner than a central portion 72 thereof, with the edge portion 70 overlapping and mating with the edge portion 66 of the lower support platform. As shown in
In one embodiment, the support ring 48 further includes an outer ring 74 with side members 76 joined to side members 60 of the inner ring with a pair of front connectors 78 and a pair of intermediate connectors 80. A pair of rear three-sided openings 81 are defined between an inner edge of the outer ring 74, an edge of the side member and the edges of the connectors 80. The openings 81 each have an inner side 85, a longer, outer curved side 87, with the sides 87 and 85 converging along the rear of the opening 81 to define a nose 89, and a third side 91 extending along and defining the connector 80 and joining the sides 85, 87. A pair of front three-sided openings 83 are defined between an inner edge of the outer ring 74, an edge of the side member 60 and the edges of the connectors 80. The openings 83 each have an inner side 93, a longer, outer curved side 95, with the sides 93, 95 converging along the front of the opening 83 to define a nose 99, and a third side 97 extending along and defining the connector 80 and joining the sides 93, 95.
It should be understood that in one embodiment, the intermediate connectors 80 may be omitted. The outer ring has a front cross member 82 and a rear member 58, which it shares with the inner ring, and which are connected to the side members 76. The front cross member 82 is spaced apart from the front member 56, which define an elongated and laterally extending U-shaped opening 84 therebetween. A flexible membrane 55 covers the opening 84, is connected to the support ring around the perimeter of the opening, and maintains the spacing between the cross member 82 and front member 56 when the cross member 82 flexes relative to the front member 56, for example when undergoing a load applied by a user's thighs. The membrane 55 may also serve as a limiter by limiting the amount of deflection of the cross member 82 when the load is applied thereto. The membrane 55 may be made of urethane, and may be over molded on the support ring 48 to cover the opening 84. Side slots 86 allow for front portions 88 of the side members 76 to flex or bend such that the front member 82 may deflect when loaded by the user's legs, while the connectors 78, 80 provide greater rigidity to the outer ring 74. An outer peripheral edge 90 is stepped, meaning a peripheral edge portion 92 thereof is thinner than the central portion 72 thereof. A pair of lugs 94 extend downwardly from the inner ring and are disposed along the sides of the boss structure, where they are supported by the tilt control assembly 18. The support ring 48 extends radially outwardly from the lower support platform 30. The support ring, including the outer ring, the inner ring and connectors, defines an upper surface 96 and a concave cavity 98. The support ring 48 is made of a compliant flexible material, which is configured to position and hold the flexible edge member 162, described in more detail below. The support ring 48 is less stiff than the support platform, and has a modulus of elasticity that is less than a modulus of elasticity of the support platform. The support ring may be made, for example, of polyester urethane, or a thermoplastic polyester elastomer.
An upper shell, also referred to as a carrier frame 100, has a central portion 102 overlying the inner ring 52 of the support ring and the lower support platform 30, and an outer ring 104 overlying the outer ring 74 of the support ring and the upper surface 34 of the support platform. The outer ring 104 and central portion 102 of the upper shell are coupled with at least two connectors, including a pair of front connectors 106 and a pair of intermediate connectors 108, which are curved with an upwardly facing concave curvature such that is rigid and resists outward/downward deflection/deformation.
A pair of rear three-sided openings 109 are defined between an inner edge of the outer ring 104, an edge of the central portion 102 and the edges of the connectors 108. The openings 109 each have an inner side 111, a longer, outer curved side 113, with the sides 111, 113 converging along the rear of the opening 109 to define a nose 115, and a third side 117 extending along and defining the connector 108 and joining the sides 111, 113. A pair of front three-sided openings 119 are defined between an inner edge of the outer ring 104, an edge of the central portion 102 and the edges of the connectors 108. The openings 119 each have an inner side 121, a longer, outer curved side 123, with the sides 121, 123 converging along the front of the opening 119 to define a nose 125, and a third side 127 extending along and defining the connector 108 and joining the sides 121, 123.
The outer ring 104 has a front cross member 110 and a rear member 112 that are connected to side members 114. The outer ring has a peripheral length defined around the perimeter thereof, with the length being fixed or maintained as a relative constant during recline of the seat. In other words, in one embodiment, the outer ring 104, defined by the side members 114, front cross member 110 and rear member 112, does not elongate during recline, or does not undergo elastic deformation along a tangent or length thereof in response to tensile forces, although the outer ring 104 is capable of bending or flexing as described in more detail below. The front cross member 110 is spaced apart from a front edge 116 of the central portion 102, which define an elongated and laterally extending U-shaped opening 118 therebetween. Side slots 120 allow for front portions 122 of the side members 114 to flex or bend such that the front cross member 110 may deflect when loaded by the user's legs, while the connectors 106, 108 provide greater rigidity to the outer ring 104. The connectors 106, 108 overlie the connectors 78, 80, with openings 84 and 118, along with membrane 53, being aligned. The upper shell includes pads 124 that overlie the pads 46. The upper shell 100 is secured to the support platform with fasteners, including for example hooks and screws.
The upper shell, or carrier frame 100, is flexible, but stiffer than the support ring 48, and has a modulus of elasticity that is greater than the modulus of elasticity of the support ring, but the carrier frame is less stiff than, and has a modulus of elasticity less than a modulus of elasticity of the support platform 30. The upper shell, or carrier frame 100, may be made of a flexibly resilient polymer material such as any thermoplastic, including, for example, nylon, glass-filled nylon, polypropylene, acetyl, or polycarbonate; any thermal set material, including, for example, epoxies; or any resin-based composites, including, for example, carbon fiber or fiberglass, thereby allowing the support platform to conform and move in response to forces exerted by a user. Other suitable materials may be also be utilized, such as metals, including, for example, steel or titanium; plywood; or composite material including plastics, resin-based composites, metals and/or plywood.
The intermediate connectors 108 of the upper shell 100 may include an area of reduced thickness defining flex regions or flexing zones 155. The upper shell 100 also may have an area of reduced thickness defining a flex region or flexing zone 153 that overlies the flex region 53 of the underlying support platform, located front of the boss structure 48.
The upper shell, or carrier frame 100, has a body facing upper surface 126, a lower surface 128 opposite the upper surface 126 and a peripheral edge surface 130, or side edge face, extending between the first and second surfaces 126, 128. In one embodiment, the peripheral edge surface 130 is substantially planar and has a vertical orientation, although it should be understood that the edge surface may be curved, curvilinear, or non-planar, and/or may be oriented at angles other than a vertical plane. The carrier frame 100 defines a concave cavity 132 with the outer ring defining a central opening 134.
A peripheral groove 136 is formed in and opens outwardly from the peripheral edge surface 130 or face. The groove 136 extends around at least a portion of the carrier frame, and in one embodiment, extends continuously around the entire periphery of the carrier frame 100. The peripheral edge portion 92 of the support frame 62 extends outwardly beyond the face 130 of the carrier frame as shown in
A textile material 150 is secured to the carrier frame 100 across the central opening 134 such that it covers the concave cavity 132. The textile material may be a suspension material, or may cover a cushion supported by the support and/or carrier frames 64, 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 in particular an upper portion 152 of the peripheral edge surface extending between the groove 136 and the upper surface 126, or landing portion 144 thereof. A peripheral edge portion 154 of the textile material 150 is coupled to the peripheral edge of the upper shell, for example with the edge portion 154 of the textile material being disposed in the groove 136. In one embodiment, a stay 156 (shown in
In another embodiment, and referring to
A carrier frame 100 has a body portion 530 with a bottom surface 532 overlying and engaging the bottom wall and an insert portion 534 that is received in the channel 526 and engages the engagement surface 528. As shown in
In one embodiment, the textile material is made of an elastomeric woven or knitted material, and may be configured as a suspension material having heat-shrinkable yarns and heat shrinkable elastomeric monofilaments, which shrink in response to the application of energy, for example heat, whether applied by radiation or convection. Various suitable suspension materials are disclosed in U.S. Pat. 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 hereby incorporated herein by reference. One commercially suitable heat-shrink suspension material is a SHRINX fabric available from Krall+Roth, Germany.
Referring to
A plurality of yarn strands 556 are interwoven with the elastomeric and non-extensible threads 552, 554 in the weft direction, or longitudinal direction 2, 2′ in one embodiment. The non-extensible threads 554 and the yarn strands 556 do not shrink when exposed to heat or energy, and are not elastomeric. Rather, the yarn strands 556 provide shape control to the overall suspension material in a final configuration after heat shrinking. The yarn strands 556 may be made of various colors, e.g., blue, to provide color to the textile material. The overall color of the blank is thereby easily changed simply by introducing different yarns in the weft direction. In contrast, the elastomeric threads are preferably transparent or black.
Referring to
Energy, such as heat, may be applied to the fabric blank from an energy source, causing the heat shrinkable elastomeric threads 552 to shrink. In other embodiments, the textile material is wrapped around or covers a cushion or underlying substrate such as a plastic or metal web, which supports the user, with the edge of the textile material secured to the carrier frame as described herein. In those embodiments, the textile material 150 may be, but is not necessarily, put in tension around the cushion or across the opening 134.
The flexible edge member 162 is configured as a ring surrounding and coupled to the peripheral edge 92 of the support frame. It should be understood that the ring may be continuous, or that the flexible edge member may extend only partially around the periphery of the carrier frame 100. The flexible edge member 162 extends upwardly from the support frame 64 and has an inner peripheral surface 164, or face, facing inwardly toward, and spaced apart from, the peripheral edge surface 130 of the carrier frame so as to form a gap G, for example and without limitation having a width of between 0.50 to 1.00 mm that is communication with the groove 136, meaning the groove and gap form a continuous, but non-linear slotted opening or pathway that receives the textile material 150. In one embodiment, the inner surface 164 is substantially planar and has a vertical orientation and extends in the Z direction, although it should be understood that the edge surface may be curved, curvilinear, or non-planar, and/or may be oriented at angles other than a vertical plane. In one embodiment, the inner surface 164 has substantially the same shape as the peripheral edge surface 130 such that the gap G is maintained constant, regardless of whether either surface or the gap G is linear. In one embodiment, the gap G is the same or slightly larger than the thickness of the textile material, which may have a thickness of about 0.75 to 1.00 mm, while in other embodiments, there is no gap (i.e. G=0), or the gap G is less than the thickness of the textile material, with the surfaces 130, 164 abutting, and/or squeezing or slightly compressing the textile material 150 therebetween. The inner surface 164 faces and covers the groove 136 and textile material 150. In addition, the flexible edge member 162 further entraps the stay 156 and textile material 150, thereby further helping to ensure that the stay 156 does not become dislodged from the groove 136.
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 may be compressed, for example if impacted. The flexible edge member 162 has a greater resilience, or is more flexible and has a substantially lower modulus of elasticity less than the support frame 62, with a durometer in the shore D range, with one embodiment having a durometer of 80-90.
The flexible edge member 162 protects the textile material 150 from inadvertent impact and wear and has an upper surface 166 substantially flush with, or slightly lower than, an upper surface 168 of the textile material 150, thereby preventing snags and providing a pleasing appearance. As mentioned, the flexible edge member 162 abuts, or is slightly spaced from, the portion of the textile material 150 disposed between the flexible edge member 162 and carrier frame 100. The flexible edge member has a groove 170, with the peripheral edge 92 of the support ring being disposed in the groove 170. In one embodiment, the flexible edge member 162 is over molded onto the peripheral edge 92 of the support frame 62, or 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 with adhesives, mechanical fasteners, such as staples or screws, or combinations thereof. The geometry of the flexible edge member 162 further promotes the protective and elastic properties thereof. For example, the flexible edge member 162 may be tapered from a first thickness T1 along the inner surface 164 to a second thickness T2 at an outermost peripheral edge thereof, with the thickness being measured parallel to the inner surface 164, or in substantially the Z direction. In one embodiment, the nose tapers to a point where T2=0. In one embodiment, the flexible edge member 162 in cross-section has a rounded nose shape. The flexible edge member 162 may be compressed in response to a load applied in the X and/or Y directions, or may deflect in response to a load applied in the Z direction as shown in
In one embodiment, an auxiliary support member 200, shown as a cushion, is disposed between the upper surface 126 of the carrier frame 100 and a bottom surface 190 of the textile material 150, configured as a suspension material, or the space defined therebetween. An 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 therebetween when the suspension material is in an unloaded configuration (i.e., without a user disposed on the suspension material). In various embodiments, the gap G2 may be maintained as a constant, with the cushion having 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 as soon as the user engages, or sits on, the suspension material. The auxiliary support member 200 may have a generally trapezoidal shape in plan view that matches the shape of the central portion 102 of the carrier frame or the support platform 30. The auxiliary support member 200 extends forwardly to cover the opening 118 and support the thighs of the user. The auxiliary support member may be made of foam. The auxiliary support member 200 may be secured to the support platform 30 and/or carrier frame 100 with fasteners, including mechanical fasteners such as screws or adhesive. In one embodiment, the auxiliary support member 200 has a bottom substrate 201, for example a plastic or wood sheet, that may be engaged with fasteners and which is connected to, or embedded in, an upper foam cushion 203 as shown in
In operation, and referring to
It should be understood that in other embodiments, the auxiliary support member 200 abuts and supports the textile material in an unloaded condition. For example, the textile material may simply cover a cushion, which fills the space of the cavity 132 of the carrier frame, with the textile material forming an upholstery cover over the top of the cushion.
In one embodiment, a method of manufacturing or assembling a body support member 10 includes positioning and securing the auxiliary support member 200 on top of the carrier frame 100. The method further includes disposing the peripheral edge portion 154, 252 of the textile material 150, 234 into the peripheral groove 136, 244 formed in the peripheral edge surface 130, 246 of the frame, with the stay 156, 250 engaging one surface of the groove. As the stay 156, 250 is rolled over for insertion into the groove, the suspension material covers the portion of the peripheral edge surface 130, 246 between the groove and the upper (or front) surface 126 (i.e., body-facing first surface of the frame). The carrier frame 100, 242 is then connected to the support frame 62, 236, which has a flexible edge member 162, 240 secured thereto for example by way of support ring 48. Conversely, the flexible edge member 162 may first be connected to the carrier frame 100, for example by way of the support ring 48, with those components thereafter being coupled to the support platform 30. In one embodiment, the flexible edge member 162, 240 is secured to the support frame 62, or support ring 48, by over molding the flexible edge member 162 onto the peripheral edge 92 of the support frame/support ring. The flexible edge member may be secured in other ways, including with adhesive or mechanical fasteners. Energy, for example thermal energy or heat applied by radiation or convection, may be applied to the suspension material 150, 234, causing the suspension material to shrink and create tension therein. The energy may be applied to the suspension material either before or after the carrier frame 100, 242 is secured to the support frame 62, 212. As the suspension material shrinks, the suspension material is put in tension across the opening 134 and the stays 250, 156 are anchored in the grooves 136, 244.
Referring to
A transition portion 216, which is a curved and defines a rearwardly facing convex bow shape in one embodiment, extends rearwardly and upwardly from the lower portion 214. A pair of laterally spaced uprights 218 extend upwardly from the transition portion 216. The back frame 210 further includes an upper cross member 220 extending between and connecting upper ends of the uprights 218, with the cross member 220, upright 218 and lower portion 214 defining a central opening. The lower portion, including a portion (arm 992) of the rear link, uprights, and cross member may be integrally formed. As shown in
The back support 212, otherwise referred to as a support frame, is flexible, and includes flex regions 225, 233 allowing it to bend and deflect in response to the user reclining in the body support structure. The back support has opposite sides spaced apart in the lateral direction and a top and bottom spaced apart in a longitudinal direction. The back support, or support frame 212, includes a pair of laterally spaced uprights 222, each having a forwardly facing convex bow shaped portion 223 at a first location proximate a lumbar region of the back support, with each bow shaped portion including and defining a flex region 225, which may be configured with thinner and flatter cross-sections, or sections having lower bending moments of inertia, for example about a horizontal axis, than the adjacent or remaining portions of the uprights. It should be understood that in an alternative embodiment, the back support may include a single upright, for example a shell that extends laterally between and has side portions connected to the back frame. The shell may be made of a flexible plastic. The shell may have a flex region defined laterally across the entire width thereof adjacent the lumbar region. The shell may have a forwardly facing concave contour, with side portions positioned forwardly of a central portion and defining a lateral space therebetween, and may support a suspension material secured to the side portions across the lateral space, for example with stays as disclosed herein. If configured with a single upright, the back support may be connected to the back frame, whether configured with one more uprights, with a pair of connectors arranged along each side of the single upright.
A bottom portion 224 extends between and connects the uprights. The back support 212 further includes a lower portion or support arm 226 that extends forwardly from the bottom portion, with the support arm or lower portion coupled to the control assembly, and in particular the rear link 25 below the seat support member 6. The lower portion includes a transition portion 217 connecting the support arm 226 and the bottom portion 224. The transition portion 217 has a rearwardly facing convex bow shape, with the curved transition portion 217 also having a forwardly facing concave bowl shape, with the curvature of the transition portion making it relative rigid, or resistant to flexing or bending. The front end of the lower portion 226 has an upturned central lip 219 or post and a pair of laterally spaced lugs 221, which partially surround upwardly extending boss structures 998 on the connector 479, with the lip 219 and lugs 221 connected to and defining part of the rear link 25, with the seat platform, seat support, back frame and back support all having overlapping portions defining in part the rear link. The lip 219 is captured by a rear wall 331 of the boss structure 49. A relatively thin and flat section 231 of the lower portion extending in a longitudinal direction 2′ defines a flex region 233 below the seat support and seating surface, and between the rear link 25 and the lumbar region 223 of the backrest and the flex region 225 defined thereby, which permits the transition portion 217 to pivot relative to the rear link 25 about the flex region 233. The thinner and flatter cross-section has a lower bending moment of inertia about a horizontal axis than the adjacent or remaining portions of the lower portion. In one embodiment, one or both of the flex regions 225 and 233 may be formed as a living hinge, or a thin flexible hinge made from the same material as the two more rigid pieces the living hinge connects, so as provide for relative rotation or pivoting between the more rigid pieces by bending of the living hinge.
Flex regions 225 are defined in each of the uprights 222 adjacent the lumbar region above the seating surface, with the lumbar regions of the uprights having a forwardly facing convex curvature. The back support has an S-shaped profile when viewed from a right side thereof as shown in
In another embodiment, each of the pair of connectors 228 extends laterally between one of the back frame uprights 218 and one of the back support uprights 222. The connectors include a first connector tab 570 extending laterally from the back frame upright and a second connector tab 572 extending laterally from the back support upright, with the first and second connector tabs 570, 572 overlapping. The connector tab 572 is disposed rearwardly of covers the connector tab 570. The connector tab 572 is relatively rigid and not flexible such that the back support 212 is not moveable in a fore/aft direction relative to the back frame at the location of the connectors 228. The first connector tab 570 has a first insert portion 574 received in a channel 576, or socket, formed in the back support upright, while the second connector tab 572 has a second insert portion 578 received in a channel 580, or socket, formed in the back frame upright. The first and second connector tabs 570, 572 are coupled with a vertically extending pin 582 at a location between the first and second uprights, which location is proximate a neutral pivot axis extending in a lateral direction. The first connector tab 570 has a through opening, or horizontally elongated slot 584, at the mid-point, and a pair of lugs 586 extending forwardly from a front surface of the tab adjacent a top and bottom of the slot 584, with the lugs defining axially aligned through openings 590. The second connector tab 572 includes a forwardly facing lug 588 extending from a front surface, with the lug 588 inserted through the slot 584 and having a through opening aligned with the openings 590 of the lugs. The pin 582 is inserted upwardly through the openings of the lugs on the front side of the connector tabs so as to secure the tabs 572, 574 one to the other. The pin 582 may have a head and be threadably engaged with one or all of the lugs 588, 586, and preferably at least the uppermost lug 586. The suspension material 150 is disposed over and covers the front of the tabs, the pins and the lugs.
The insert portions 574, 578, which are non-cylindrical, are rotatable about a laterally extending axis 592 relative to the channels or sockets 576, 580 as the back support flexes about flex regions 225, 233 relative to the back frame 210 and rear link 25. The connector tabs each include a shoulder portion 594 that abuts a stop surface 596 of the opposing upright so as to locate the connector tabs and align the lugs.
Referring to
Referring to
The spacing W2, for example about 330 mm in one embodiment, between the connectors 228 on the opposite sides of the back support provides relative stability to the upper portion of the back support 212, which resists rotation or torsional movement about a longitudinal axis 2 or fore-aft bending or flexing. In contrast, the centrally located rear link 25, and the overall width (W3) thereof, which is the only support for the bottom of the back support 212, allows for rotation or torsional movement of the bottom 224 of the back support relative to the top of the back support about a longitudinal axis 2′, with the rotation or torsional movement of the top of the back support being restricted as previously explained. In one embodiment, the ratio of W2 to W3 is about 2:1 or greater.
The lower portions 214, 226, or support arms, of the back frame and back support are vertically spaced and define an open lateral pass through therebetween, notwithstanding that both support arms pivot about the same flex region 31 due to their common connection to the vertically extending and rigid rear link 25.
In addition, because the seat support 6 and back support 212 are separate, and independently connected to the rear link 25 and therefore independently pivotable relative to the rear link 25, side-to-side rotation of the rear portion of the seat, and bottom of the back support, are not restricted by a connection to each other.
In other words, the rear of the seat assembly 8 is not directly connected to the back support 212, but rather the seat assembly 8 and back support 212 are only interconnected through the centrally located rear link 25, such that the rear of the seat assembly 8 and the bottom of the back support 212 are independently rotatable about their respective longitudinal axes 2, 2′. Likewise, the back frame 210 is also supported at a lower portion 214 thereof by the centrally located rear link 25.
The back support 212 includes an upper member 230 extending between and connected to upper ends of the pair of second uprights 222, and the bottom portion 224 extends between and is connected to the lower ends of the pair of second uprights. The upper member 230, uprights 222 and the bottom portion 224 define a central opening 232. A suspension material 234 is stretched across the central opening 232 and is secured to the back support 212 in a similar fashion as the seat.
Specifically, the upper member 230, the bottom portion 224 and the pair of second uprights 222 define a support frame 236 having a peripheral edge 238 as shown in
In another embodiment, and referring to
The insert portion 824 is received in the channel 816 and engages the engagement surface 814. The carrier frame 820 further includes upper and lower pairs of lugs 827 that are aligned with lug 829 on the support frame 236, with fasteners 831 securing the lugs 827, 829 to further connect the support frame 236 and carrier frame 820. The carrier frame 820 includes a second flange 826 that forms an outwardly facing groove 830 with the flange 822 and defines an outer peripheral edge wall 827. The flange 826 extends across the channel 810 with an edge 832 positioned adjacent the inner peripheral edge wall 808 and closing the channel. Tension applied by the textile material, configured as a suspension material 150 in one embodiment, thereafter applies a moment to the carrier frame 820 causing it to bear up against the bottom surface of the support frame and the engagement surface. A flexible edge member 240 is coupled to the outer surface of the peripheral edge wall 804 of the support frame, with a lip portion overlying a top surface of the support frame. The flexible edge member 240 has an inner surface spaced apart from and facing inwardly toward the peripheral edge wall of the carrier frame, with the inner surface and the peripheral edge wall 827 of the carrier frame defining a gap therebetween. A portion of the textile material is disposed in the gap, with the textile material covering the peripheral edge wall 827 and body facing surface of the carrier frame. The peripheral edge of the textile material is secured to a stay 156, with the edge portion of the textile material and the stay disposed in the groove 830. The carrier frame 242 may be secured to the support frame with the overlapping tabs 815, 825 and fasteners 831, including mechanical fasteners and/or adhesive.
Referring to
The cross member 718 has a forwardly facing and laterally extending slot 720 and a laterally extending cavity 722 disposed rearwardly of the slot. The stay 718 has a head portion 724 disposed in the cavity and a neck portion 726 extending through the slot. The stay is sewn to the suspension material. The stay comprises a first thinned region 728 formed along a length thereof, wherein the stay is sewn to the suspension material along the thinned region. The stay is resiliently bendable. In a pre-installation configuration, the stay has a flat surface 732 that lies flat against the suspension material, such that the suspension material and stay may be easily translated and processed under a sewing machine. The neck portion is connected to the head portion adjacent a second thinned region 730, which defines a flex region. The head portion includes a catch member 734, which extends upwardly from the flat surface. After the stay is secured to the fabric, the stay may then be bent with the head portion 724 rotatable relative to the neck portion from an insert position, wherein the head is insertable through the slot 720, to a retention position, wherein the head portion, and catch member 734 in particular, is retained in the cavity and the catch portion engages one or more edges of the channel 720.
Referring to
In an alternative embodiment, shown in
Referring to
Referring to
The headrest includes an insert frame 1012 having a central track 1014, with one side of the track having a plurality of indents 1016. A ratchet block 1018 is inserted in the track. The ratchet block is fixedly coupled to the leg mounting portion 1008, or platform, with a pair of fasteners 1020, with the frame 1012 trapped therebetween. The block 1018 includes a flexible pawl 1028 extending laterally from the block. A cushion 1024, which may be a suspension material or a foam member covered with fabric, is connected to the frame, for example by engaging a peripheral groove 1022 extending around the periphery of the frame. The headrest 1000 is vertically moveable relative to the fixed ratchet block 1018, which moves within the track 1014. The flexible ratchet pawl or arm flexes laterally, with an end portion engaging at least one of the indents 1016 to index the headrest on the leg 1006. The headrest 1000 may be gripped and moved vertically to position the headrest at a desired location along the length of the strap, with pawl 1028 flexing in and out of engagement with the indents 1016. As shown in
In operation, and referring to
The resilience and deflection of the side portions 114 is primarily a function of the deflection of the at least one connector 80, 108 extending between the central portion 102 and support platform 30 and the side portions 114. The connectors 80, 108 extend upwardly and outwardly from the central portion, and curved with an upwardly facing concave surface such that is rigid and resists outward/downward deflection/deformation. As noted above, the connectors 80, 108 includes a pair of opposite side connectors that are inwardly deflectable from the first unloaded configuration to the first loaded configuration in response to the load applied to the elastic material.
The user 101 may recline, with the tilt control assembly 18 providing for the seat and/or backrest assemblies 8, 6 to move rearwardly, whether by pivoting, rotation, translation or a combination thereof, for example by way of a four-bar mechanism including links 8, 23, 25 and 33.
Referring to
As the user reclines, the back frame 218 tilts rearwardly with the rear link 25, with the back support 212 also tilting with the rear link 25. At the same time, and in response to a load applied to the backrest by the user, the back support 212, and the lower portion 226 and uprights 222 in particular, will flex about the flex regions 225, 231 respectively, while pivoting relative to the back frame 218 by way of the connectors 228. In particular, the flex region 225 of each upright 222 adjacent the lumber region will bend or flex to provide more support at the lumbar, while the lower flex region 231 accommodates and permits the flexing of the lumbar region. At the same time, the connectors 228 above the flex region 225 permit rotation of the back support 212, and the uprights 222 in particular, relative to the back frame 210 and uprights 218 to accommodate the flexing of the lumbar region.
Due to the orientation of the front and rear links, and relative positioning of the flex regions 27, 53, which are disposed upwardly and forwardly of the flex regions 29, 31 respectively, the four-bar linkage provides a weight activated system, meaning the weight of the user is taken into account when reclining since the increase in potential energy is offset by the kinetic energy required to recline. In this way, the four-bar mechanism will provide more resistance to a heavier user and automatically counterbalance the user. As noted previously, the amount of recline may be limited by the recline limiter, while energy may supplied to boost the resistance to recline and return the body support assembly to the upright, nominal position.
Although the present invention has been described with reference to preferred embodiments, those skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the invention. As such, it is intended that the foregoing detailed description be regarded as illustrative rather than limiting and that it is the appended claims, including all equivalents thereof, which are intended to define the scope of the invention.
This application claims the benefit of U.S. Provisional Application No. 62/947,911, filed Dec. 13, 2019 and entitled “Body Support Assembly and Methods for the Use and Assembly Thereof,” claims the benefit of U.S. Provisional Application 62/947,914, filed Dec. 13, 2019 and entitled “Body Support Assembly and Methods for the Use and Assembly Thereof,” and also claims the benefit of U.S. application Ser. No. 16/794,946, filed Feb. 19, 2020 and entitled “Body Support Assembly and Methods for the Use and Assembly Thereof,” the entire disclosure of which is hereby incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 62947911 | Dec 2019 | US | |
| 62947914 | Dec 2019 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 16794946 | Feb 2020 | US |
| Child | 17119490 | US |
