A dual-purpose pole chair and torso support apparatus including a seat portion, a rectangular base plate having four feet, and an elongated pole extending from the seat portion having a proximal end and an oppositely disposed distal end. The seat portion is connected to the proximal end of the pole, while the rectangular base plate is connected to the distal end of the pole. Both the seat portion and the rectangular base plate are connected to the pole via a quick release fastener system.

In a seat height adjustment method for a chair, a body height of a user of an electronic device is acquired from the electronic device which is in communication with the chair. The method further computes a target seat height suitable for the user according to the user's body height and a preset formula. The lifting device can automatically adjust the seat height for a user when the user has leave the chair and further returning the seat of the chair to an original height.

In a seat height adjustment method for a chair, a body height of a user of an electronic device is acquired from the electronic device which is in communication with the chair. The method further computes a target seat height suitable for the user according to the user's body height and a preset formula. The lifting device can automatically adjust the seat height for a user when the user has leave the chair and further returning the seat of the chair to an original height.

A chair assembly includes a base structure defining upper and lower portions, and a support structure, a seat support structure having a forward portion pivotably connected to the upper portion of the base structure for rotation about a first pivot point and a rearward portion, a back support structure having a forward portion pivotably connected to the lower portion of the base structure for rotation about a second pivot point that is located below and rearward of the first pivot point, and an upwardly extending back portion that moves rearwardly and downwardly as the back support structure pivots and the back portion moves, and a control link pivotably coupled to the seat support structure for rotation about a third pivot point and to the back support structure for rotation about a fourth pivot point each located rearward of the first and second pivot points.

A chair assembly includes a base structure defining upper and lower portions, and a support structure, a seat support structure having a forward portion pivotably connected to the upper portion of the base structure for rotation about a first pivot point and a rearward portion, a back support structure having a forward portion pivotably connected to the lower portion of the base structure for rotation about a second pivot point that is located below and rearward of the first pivot point, and an upwardly extending back portion that moves rearwardly and downwardly as the back support structure pivots and the back portion moves, and a control link pivotably coupled to the seat support structure for rotation about a third pivot point and to the back support structure for rotation about a fourth pivot point each located rearward of the first and second pivot points.

A low-cost height adjustable comfort seat including a frame assembly, legs support assembly, and structure supports assembly. The frame assembly includes a sitting structure with a lower section with inclination angle and a horizontal section. The couch cushion is attached on top of the sitting structure that creates a comfortable seat for the user. Legs support assembly includes adjustable supports in the front and rear side thereof wherein the rear side includes a spring-loaded mechanism. The structure assembly includes back supports attached to the back of the couch to support and absorb the weight of the user by means of structure elastic mechanism coupled between the sitting structure and the back supports, thereby the elastic support in conjunction with the structure elastic mechanism works in concert for sitting and standing up.

A low-cost height adjustable comfort seat including a frame assembly, legs support assembly, and structure supports assembly. The frame assembly includes a sitting structure with a lower section with inclination angle and a horizontal section. The couch cushion is attached on top of the sitting structure that creates a comfortable seat for the user. Legs support assembly includes adjustable supports in the front and rear side thereof wherein the rear side includes a spring-loaded mechanism. The structure assembly includes back supports attached to the back of the couch to support and absorb the weight of the user by means of structure elastic mechanism coupled between the sitting structure and the back supports, thereby the elastic support in conjunction with the structure elastic mechanism works in concert for sitting and standing up.

A chair comprises a seat pan member, a seat back member having a lumbar support member, a lumbar support assembly operatively connected to the lumbar support member and configured for moving the lumbar support member, with respect to the seat pan member and the seat back member, between at least a first position and a second position, and an actuator configured to operate the lumbar support assembly for movement of the lumbar support member between at least the first position and the second position. When the lumbar support member is in the second position, the lumbar support member is positioned forwardly, in a direction toward the seated user's lower back, relative to the seat back member so as to enable the user to be seated forwardly on the seat pan member while being engaged with the lumbar support member.

A chair comprises a seat pan member, a seat back member having a lumbar support member, a lumbar support assembly operatively connected to the lumbar support member and configured for moving the lumbar support member, with respect to the seat pan member and the seat back member, between at least a first position and a second position, and an actuator configured to operate the lumbar support assembly for movement of the lumbar support member between at least the first position and the second position. When the lumbar support member is in the second position, the lumbar support member is positioned forwardly, in a direction toward the seated user's lower back, relative to the seat back member so as to enable the user to be seated forwardly on the seat pan member while being engaged with the lumbar support member.

A hydraulic buffering leg cushion is mounted to a supporting platform. The hydraulic buffering leg cushion includes a leg cushion body, a movable unit, and a fixed connecting member. The leg cushion body is provided with a leg cushion accommodating space, and includes an upper cover, and a lower cover. The movable unit is received in the leg cushion accommodating space, and includes a piston, a membrane assembly, a rubber bowl, and a movable portion. The rubber bowl is clamped, at its outer circumference, by and between the upper cover and the lower cover, so as to partition a damping accommodating space for receiving damping oil. The movable portion and the rubber bowl are pressed, in sequence, onto the piston. The piston is provided with a damping channel, and is connected with the lower cover through a restoring spring. The membrane assembly is disposed underneath the piston, and forms, with the piston, a one-way valve structure. The restoring spring passes through the membrane assembly. The fixed connecting member is fixedly arranged on the movable portion of the movable unit. As such, by using the supporting force of the restoring spring and the damping oil in the damping accommodating space for providing with buffering hydraulic pressure, a balance for the supporting platform can be adjusted automatically to a balance within an effective range for the supporting platform, without the need of a manual adjustment for a balance. This will ensure stability of the supporting platform without shaking easily.