A seat having particular application for a chair to enhance the comfort of one seated in the chair. A plurality of (e.g., foam) cushion layers laying one over the other are located at the top of the seat. One of the plurality of foam cushion layers is manufactured from a material having a memory which conforms to and temporarily retains the shape of the user. Located at the bottom of the seat below the plurality of cushion layers are a plurality of coil springs that stand upwardly against the cushion layers in side-by-side alignment with one another so that the back of the seat is firmer than the front. The plurality of cushion layers are arranged in a stack such that the density of the memory foam cushion layer is greater than the density of the other Ones of the plurality of cushion layers.

A seat having particular application for a chair to enhance the comfort of one seated in the chair. A plurality of (e.g., foam) cushion layers laying one over the other are located at the top of the seat. One of the plurality of foam cushion layers is manufactured from a material having a memory which conforms to and temporarily retains the shape of the user. Located at the bottom of the seat below the plurality of cushion layers are a plurality of coil springs that stand upwardly against the cushion layers in side-by-side alignment with one another so that the back of the seat is firmer than the front. The plurality of cushion layers are arranged in a stack such that the density of the memory foam cushion layer is greater than the density of the other Ones of the plurality of cushion layers.

A cushioning device for supporting a user in seated or recumbent posture, e.g., in a wheelchair, comprises a resiliently compressible foam base layer with an upper surface formed of a configuration generally conforming to the user's body and defining a fluid drainage path to a fluid drainage and collection area in case of incontinence episodes, an absorbent layer disposed in association with the fluid collection area for collection and holding fluids draining to the collection area, a fluid-impermeable bottom layer covering the underside of the base layer, and a non-absorbent top layer covering the upper surface of the base layer. Together, the fluid permeability and non-absorbent character of the top layer and the compressible resiliency and drainage configuration of the foam base layer for draining fluids to the absorbent layer, mitigate pressure, heat, moisture, shear and friction conditions that are the main contributing causes to formation of decubitus ulcers.

A cushioning device for supporting a user in seated or recumbent posture, e.g., in a wheelchair, comprises a resiliently compressible foam base layer with an upper surface formed of a configuration generally conforming to the user's body and defining a fluid drainage path to a fluid drainage and collection area in case of incontinence episodes, an absorbent layer disposed in association with the fluid collection area for collection and holding fluids draining to the collection area, a fluid-impermeable bottom layer covering the underside of the base layer, and a non-absorbent top layer covering the upper surface of the base layer. Together, the fluid permeability and non-absorbent character of the top layer and the compressible resiliency and drainage configuration of the foam base layer for draining fluids to the absorbent layer, mitigate pressure, heat, moisture, shear and friction conditions that are the main contributing causes to formation of decubitus ulcers.

A chair assembly includes a seat support structure, a back support structure, a back tensioning assembly adjustable between low and high tension positions, an actuator assembly adapted to adjust the back tensioning assembly between the low and high tension positions, a control input assembly actuable by rotating the portion of the control input assembly, and a control link assembly operably coupling the control input assembly with the actuator assembly to adjust the back tensioning assembly between the low and high tension positions upon rotation of the portion of the control assembly by a seated user, wherein a number of rotations of the portion of the control input assembly is not limited by the control link.

A method of assembling a spring inside of a tube includes providing a coil spring and a tube having a first retaining structure at a first end of the tube. The method includes positioning a rod in the tube. The spring is positioned in the tube, and a second retaining structure is attached to the rod with the spring positioned between the first and second retaining structures. A force is applied to the spring, and the second retaining structure is fixed at a position wherein the spring provides a desired preload.

A decorative cushion includes a relatively rigid, e.g., foam, inner core and a relatively soft filled portion comprising fill material enclosed in a flexible cover. The filled portion is positioned adjacent a first end of the inner core and may have a compressibility level that is less a compressibility level of the inner core. The first end of the inner core may have a concave contour, and the filled portion may mount or seat in the contour. A first cushion cover is sized for fully receiving the inner core and the filled portion and configured to maintain the position of the filled portion relative to the inner core. A second, decorative cushion cover is sized for fully receiving the first cushion cover containing the inner core and the filled portion. An electric massage unit may be mounted to the inner core at a location spaced from the filled portion. The inner core provides support to the user, while the filled portion allows cushion to be decoratively arranged by the user.

A sitting bones cushion can include a right aperture and a left aperture, which can allow a person sitting on the cushion to experience reduced pressure on the person's lower pelvis. The sitting bones cushion can also include a right leg support cutout, a left leg support cutout, and a rear cutout, which can allow a person sitting in the cushion to experience reduced pressure on the person's coccyx, while having support and guidance to the position of the legs. The features of the cushion may promote a healthy sitting posture, proper spine alignment, and may reduce or prevent pain in the lower back and buttocks. Also disclosed is a method for configuring a support contour of a cushion.

A toroidal seat cushion, in the shape of a ring-torus, can include a central aperture, a right leg support cutout, a left leg support cutout, and a rear cutout, which can allow a person sitting in the cushion to experience reduced pressure on the person's coccyx and central buttocks, while having support and guidance to the position of the legs. The features of the cushion may promote a healthy sitting posture, proper spine alignment, and may reduce or prevent pain in the lower back and central buttocks. Also disclosed is a method for configuring a support contour of a cushion.

A toroidal seat cushion, in the shape of a ring-torus, can include a central aperture, a right leg support cutout, a left leg support cutout, and a rear cutout, which can allow a person sitting in the cushion to experience reduced pressure on the person's coccyx and central buttocks, while having support and guidance to the position of the legs. The features of the cushion may promote a healthy sitting posture, proper spine alignment, and may reduce or prevent pain in the lower back and central buttocks. Also disclosed is a method for configuring a support contour of a cushion.