Abstract: A back support for a chair includes a chair frame, a pair of upright support posts mounted to the chair frame, the upright support posts being laterally flexible with respect to the chair frame, a plurality of flexible support arms extending laterally outwardly from the upright support posts, the support arms each including a peripheral edge, the support arms including a first set of support arms extending in a first lateral direction from the upright posts and a second set of support arms extending in a second direction from the upright posts; and a material extending in tension between the peripheral edges of the first set of support arms and the peripheral edges of the second set of support arms such that at least a central portion of the material is spaced from the support arms. In addition, a seat support includes a repositionable front edge.

Abstract: An office chair is provided having a back assembly which is configured to provide supplemental support to the back of a chair occupant in addition to the support provided by the primary support surface of the chair back. The chair back includes a lumbar support unit having a lumbar support pad that includes a plurality of support rings disposed one inside of the other.

Abstract: A seat has a first ischial region, a second ischial region, a tailbone region and a thigh transitional region, each having at least one slot. Each slot generally opens outward, away from a center of the seat. Each slot may have an elongated central portion and two distal portions extending from the central portion. The central portion and distal portions may have a specific configuration relative to each other to provide desired support characteristics. The slots may allow flexing and cantilevering of portions of the seat to dynamically contour the seat based on the weight of the user.

Abstract: A seat has a first ischial region, a second ischial region, a tailbone region and a thigh transitional region, each having at least one slot. Each slot generally opens outward, away from a center of the seat. Each slot may have an elongated central portion and two distal portions extending from the central portion. The central portion and distal portions may have a specific configuration relative to each other to provide desired support characteristics. The slots may allow flexing and cantilevering of portions of the seat to dynamically contour the seat based on the weight of the user.

Abstract: A back support (12) for a chair includes a chair frame (20), a pair of upright support posts (18) mounted to the chair frame (20), the upright support posts (18) being laterally flexible with respect to the chair frame (20), a plurality of flexible support arms (21) extending laterally outwardly from the upright support posts (18), the support arms (21) each including a peripheral edge (23), the support arms (21) including a first set of support arms extending in a first lateral direction from the upright posts (18) and a second set of support arms extending in a second direction from the upright posts (18); and a material (42) extending in tension between the peripheral edges (23) of the first set of support arms and the peripheral edges (23) of the second set of support arms such that at least a central portion of the material (42) is spaced from the support arms (21).

Abstract: A seat has a first ischial region, a second ischial region, a tailbone region and a thigh transitional region, each having at least one slot. Each slot generally opens outward, away from a center of the seat. Each slot may have an elongated central portion and two distal portions extending from the central portion. The central portion and distal portions may be substantially linear and may have a specific configuration relative to each other to provide desired support characteristics. The slots may allow flexing and cantilevering of portions of the seat to dynamically contour the seat based on the weight of the user. Multiple grooves may be included at the front of the seat to facilitate curling of the front of the seat.

Abstract: A seat has a first ischial region, a second ischial region, a tailbone region and a thigh transitional region, each having at least one slot. Each slot generally opens outward, away from a center of the seat. Each slot may have an elongated central portion and two distal portions extending from the central portion. The central portion and distal portions may be substantially linear and may have a specific configuration relative to each other to provide desired support characteristics. The slots may allow flexing and cantilevering of portions of the seat to dynamically contour the seat based on the weight of the user. Multiple grooves may be included at the front of the seat to facilitate curling of the front of the seat.

Abstract: An office chair is provided having a back assembly which is configured to provide supplemental support to the back of a chair occupant in addition to the support provided by the primary support surface of the chair back. The chair back includes a lumbar support unit having a lumbar support pad that includes a plurality of support rings disposed one inside of the other.

Abstract: A seat has a first ischial region, a second ischial region, a tailbone region and a thigh transitional region, each having at least one slot. Each slot generally opens outward, away from a center of the seat. Each slot may have an elongated central portion and two distal portions extending from the central portion. The central portion and distal portions may be substantially linear and may have a specific configuration relative to each other to provide desired support characteristics. The slots may allow flexing and cantilevering of portions of the seat to dynamically contour the seat based on the weight of the user. Multiple grooves may be included at the front of the seat to facilitate curling of the front of the seat.

Abstract: An office chair is provided having a back assembly which is configured to provide supplemental support to the back of a chair occupant in addition to the support provided by the primary support surface of the chair back. The chair back includes a lumbar support unit having a lumbar support pad wherein asymmetric support is provided to the left and right halves of the lumbar pad. As such, the asymmetric support loads are independently adjustable to more comfortably support a chair occupant. The chair back also includes a pelvic support pad which is disposed vertically adjacent to the lumbar support.

Abstract: A seat has a first ischial region, a second ischial region, a tailbone region and a thigh transitional region, each having at least one slot. Each slot generally opens outward, away from a center of the seat. Each slot may have an elongated central portion and two distal portions extending from the central portion. The central portion and distal portions may be substantially linear and may have a specific configuration relative to each other to provide desired support characteristics. The slots may allow flexing and cantilevering of portions of the seat to dynamically contour the seat based on the weight of the user. Multiple grooves may be included at the front of the seat to facilitate curling of the front of the seat.

Abstract: An office chair is provided having a back assembly which is configured to provide supplemental support to the back of a chair occupant in addition to the support provided by the primary support surface of the chair back. The chair back includes a lumbar support unit having a lumbar support pad wherein asymmetric support is provided to the left and right halves of the lumbar pad. As such, the asymmetric support loads are independently adjustable to more comfortably support a chair occupant. The chair back also includes a pelvic support pad which is disposed vertically adjacent to the lumbar support.

Abstract: An office chair is provided having a back assembly which is configured to provide supplemental support to the back of a chair occupant in addition to the support provided by the primary support surface of the chair back. The chair back includes a lumbar support unit having a lumbar support pad wherein asymmetric support is provided to the left and right halves of the lumbar pad. As such, the asymmetric support loads are independently adjustable to more comfortably support a chair occupant. The chair back also includes a pelvic support pad which is disposed vertically adjacent to the lumbar support.

Abstract: Electromagnetic forming can lead to better formability along with additional benefits. The spatial distribution of forming pressure in electromagnetic forming can be controlled by the configuration of the actuator. A type of actuator is discussed which gives a uniform pressure distribution in forming. It also provides a mechanically robust design and has a high efficiency for flat sheet forming.

Abstract: Electromagnetic forming can lead to better formability along with additional benefits. The spatial distribution of forming pressure in electromagnetic forming can be controlled by the configuration of the actuator. A type of actuator is discussed which gives a uniform pressure distribution in forming. It also provides a mechanically robust design and has a high efficiency for flat sheet forming.

Abstract: An office chair (10) is provided-having a contoured back assembly (24) comprising a back frame (23) and a suspension fabric (26). The fabric is attached to the back frame through a spline (58) wherein the back frame has a three-dimensional contoured shape formed by overlapped frame rings with the fabric being joined thereto by a spline. The back frame has a split upright section to increase the ability of the left and right halves of the frame to articulate relative to each other. Further, a bayonet connection is provided between the back frame and a support upright which bayonet connection holds together the upper ends of two separate uprights of a tilt control mechanism.

Abstract: An office chair is provided having a back assembly which is configured to provide supplemental support to the back of a chair occupant in addition to the support provided by the primary support surface of the chair back. The chair back includes a lumbar support unit having a lumbar support pad wherein asymmetric support is provided to the left and right halves of the lumbar pad. As such, the asymmetric support loads are independently adjustable to more comfortably support a chair occupant. The chair back also includes a pelvic support pad which is disposed vertically adjacent to the lumbar support.

Abstract: An office chair is provided having a back assembly which is configured to provide supplemental support to the back of a chair occupant in addition to the support provided by the primary support surface of the chair back. The chair back includes a lumbar support unit having a lumbar support pad wherein asymmetric support is provided to the left and right halves of the lumbar pad. As such, the asymmetric support loads are independently adjustable to more comfortably support a chair occupant. The chair back also includes a pelvic support pad which is disposed vertically adjacent to the lumbar support.

Abstract: An office chair is provided having a contoured back assembly comprising a back frame and a suspension fabric. The fabric is attached to the back frame through a spline wherein the back frame has a three-dimensional contoured shape formed by overlapped frame rings with the fabric being joined thereto by a spline. The fabric is secured to the frame by a machine wherein the fabric is first stretched from the outer edge of the fabric and then is clamped to a frame surface in the pre-tensioned or pre-streched condition. The fabric edges are allowed to hang loose and then fixed in the frame by a spline. Once secured, the fabric is unclamped from the frame.