Sitting furniture (100) comprising a seat (110), a lower leg support (120) and a chest support (130). The invention is characterised in that the seat (110) is arranged to support the posterior thigh (11) and/or buttocks (12) of a seated user (10) such that the femur bone (13) of the seated user (10) is downwards inclined in the anterior direction at an angle of at least 40° downwards in relation to the horizontal, in that the lower leg support (120) is arranged to support the anterior side of the lower legs (14) of the seated user (10), and in that the chest support (130) is arranged to support the chest (15) of the seated user (10) in a forward leaning position of the seated user (10) such that the third lumbar vertebrae body (16) of the seated user (10) is arranged in a support plane (150), which support plane (150) is perpendicular to the sagittal plane of the user and in which support plane (150) the respective pivot point (17) of the seated user's (10) hip joints and the respective pivot point (18) of the seated user's (10) shoulder joints are also arranged when the posture of the seated user (10) is symmetric about the seated user's (10) sagittal plane.

Sitting furniture (100) comprising a seat (110), a lower leg support (120) and a chest support (130). The invention is characterised in that the seat (110) is arranged to support the posterior thigh (11) and/or buttocks (12) of a seated user (10) such that the femur bone (13) of the seated user (10) is downwards inclined in the anterior direction at an angle of at least 40° downwards in relation to the horizontal, in that the lower leg support (120) is arranged to support the anterior side of the lower legs (14) of the seated user (10), and in that the chest support (130) is arranged to support the chest (15) of the seated user (10) in a forward leaning position of the seated user (10) such that the third lumbar vertebrae body (16) of the seated user (10) is arranged in a support plane (150), which support plane (150) is perpendicular to the sagittal plane of the user and in which support plane (150) the respective pivot point (17) of the seated user's (10) hip joints and the respective pivot point (18) of the seated user's (10) shoulder joints are also arranged when the posture of the seated user (10) is symmetric about the seated user's (10) sagittal plane.

A chair footrest ring positioning structure includes a guide region tilting downward and concavely disposed on an outer surface of any one side of the lower segment of the tightening case, one or more anti-slip pads fixed inside an internal space of the tightening case, one or more grooves concavely disposed at a periphery of the tightening case, to facilitate insertion of a middle pipe of the chair, and a sleeve corresponding in shape to the middle of the footrest ring fitted around the tightening case. One or more bumps extending from an inner side of the sleeve are inserted into the grooves of the tightening case, respectively. When the middle pipe is rotated to move the tightening case by a predetermined distance, the guide region undergoes a displacement to drive insertion of the bumps, thereby pushing the tightening case inward.

A chair footrest ring positioning structure includes a guide region tilting downward and concavely disposed on an outer surface of any one side of the lower segment of the tightening case, one or more anti-slip pads fixed inside an internal space of the tightening case, one or more grooves concavely disposed at a periphery of the tightening case, to facilitate insertion of a middle pipe of the chair, and a sleeve corresponding in shape to the middle of the footrest ring fitted around the tightening case. One or more bumps extending from an inner side of the sleeve are inserted into the grooves of the tightening case, respectively. When the middle pipe is rotated to move the tightening case by a predetermined distance, the guide region undergoes a displacement to drive insertion of the bumps, thereby pushing the tightening case inward.

Various systems and methods relate to an adaptive chair system having (i) a stowed mode in which the members of the chair frame are contained within a compact flexible multi-function bag (MFB), and (ii) a deployed mode in which the MFB is adapted to releasably couple to an arm of the chair to provide a multipurpose accessory chamber. In an illustrative example, the MFB may, for example, fold in on itself in an accessory mode. The MFB may provide various utilities for hikers, for example, by providing a case to receive an inflatable bladder so as to form a pillow. The MFB may receive a thermal liner adapted to maintain, for example, food or beverage temperature. Various embodiments may advantageously provide a rugged, water resistant MFB system in an ultralight form factor that serves as a multipurpose accessory (e.g., to store items), yet provides a compact, adaptive chair frame containment.

Disclosed herein is a collapsible unit for facilitating multiuse of the collapsible unit, in accordance with some embodiments. Accordingly, the collapsible unit may be deployable on at least one surface. Further, the collapsible unit may include a frame. Further, the frame may include a plurality of primary members disposed vertically in relation to the at least one surface. Further, the frame may include at least one secondary member coupled with the plurality of primary members. Further, the collapsible unit may include a seat member disposed in the frame. Further, the seat member may include a seat panel disposed in the enclosure. Further, the collapsible unit may include at least one wheel coupled to the frame. Further, the at least one wheel may be configured for moving the collapsible unit on the at least one surface.

An ergonomic chair comprising a seat, a lower leg support, a chest support and a hip support. The seat is configured to support the posterior thigh and/or buttocks of a seated user, the seat being configured to urge the hip of the seated user in a forward direction. The lower leg support is configured to support the anterior side of the lower legs of the seated user. The chest support is configured to support the chest of the seated user in a forward leaning position of the seated user. The hip support is configured to support the anterior hip of a seated user as the seat urges the seated user’s hip forwardly towards the hip support.

An ergonomic chair comprising a seat, a lower leg support, a chest support and a hip support. The seat is configured to support the posterior thigh and/or buttocks of a seated user, the seat being configured to urge the hip of the seated user in a forward direction. The lower leg support is configured to support the anterior side of the lower legs of the seated user. The chest support is configured to support the chest of the seated user in a forward leaning position of the seated user. The hip support is configured to support the anterior hip of a seated user as the seat urges the seated user’s hip forwardly towards the hip support.

A chair includes a frame unit including a seat frame, a leg rest that is pivotally mounted to the seat frame, and a rest adjusting mechanism that is connected between the leg rest and the seat frame. The rest adjusting mechanism is convertible between an unlocked state, where the leg rest is permitted to pivot relative to the seat frame, and a locked state, where the leg rest is not permitted to pivot relative to the seat frame.

An armchair comprising a seat chassis supported on a support chassis by a pair of support columns, a chair back structure pivotally attached to a rear end of the seat chassis and to the support chassis, and a leg support structure pivotally attached to a front end of the seat chassis and connected to a beam, wherein the beam is attached the chair back structure. A first actuating device is mounted to the chair back, where a protracting end of the first actuating device is connected to the seat chassis. The armchair further comprises a second actuating device mounted to the support chassis, a footrest connected to a protracting end of the second actuating device, a third actuating device attached to the seat chassis, and a seating structure connected to a protracting end of the third actuating device and mounted above the seat chassis, wherein the seating structure includes an operative position projecting upwards and forwards by the third actuating device at a tilting angle from the seat chassis.