Abstract: Seating mechanisms enable the user to vary the seating angle of a chair or stool by enabling at least the portion of the chair that supports the thighs to be tilted forwardly to controllably increase the seating angle while maintaining the spine and pelvic region in vertical alignment. The extent of forward tilt is controlled by pressure applied by the user's thighs that also serves to counterbalance the weight of the user's torso.

Abstract: Seating mechanisms enable the user to vary the seating angle of a chair or stool by enabling at least the portion of the chair that supports the thighs to be tilted forwardly to controllably increase the seating angle while maintaining the spine and pelvic region in vertical alignment. The extent of forward tilt is controlled by pressure applied by the user's thighs that also serves to counterbalance the weight of the user's torso.

Abstract: A chair mechanism for an ergonomically adjustable, reclinable chair includes a frame and profile bands mounted to the frame. The profile bands are flexible and are configured to define a forwardly projecting lumbar region, the degree of forward projection of the lumbar region being variable in response to the position and movement of the chair seat. A flexible back support surface is carried by and spans the region between the profile bands. The shape and contour of the back surface is controlled by the shape of the profile bands. The chair mechanism enables the user to shift easily between upright and reclining positions without requiring the use of heavy springs or complex linkages.

Abstract: A chair mechanism for an ergonomically adjustable, reclinable chair includes a frame and profile bands mounted to the frame. The profile bands are flexible and are configured to define a forwardly projecting lumbar region, the degree of forward projection of the lumbar region being variable in response to the position and movement of the chair seat. A flexible back support surface is carried by and spans the region between the profile bands. The shape and contour of the back surface is controlled by the shape of the profile bands. The chair mechanism enables the user to shift easily between upright and reclining positions without requiring the use of heavy springs or complex linkages.

Abstract: A tilt chair having a foot adapted to be supported by a support surface and a first leg pivotally mounted to the foot. A second leg is pivotally mounted to the first leg. A moveable support member is mounted to the second leg and is adapted to be supported by the support surface. The moveably support member is moveable in a first and second direction toward and away from the foot respectively as the first leg pivots relative to the second leg and as the first leg pivots relative to the foot. In one embodiment, the moveable support member is configured as a wheel. In one embodiment, a lower back member has a lower end pivotally mounted to the first leg and an upper back member pivotally mounted to an upper end of the lower back member. A restraining link is pivotally mounted between the lower back member and the second leg. An upper back link has a lower end pivotally mounted to the first leg and an upper end pivotally mounted to the upper back member.