A chair for reducing a load on the buttocks and the waist, and, to a chair (100) includes a seat (110) and a backrest (130) and further comprising a spacer (120) protruding upward from the rear end of the seat (110), wherein the bottom of the backrest (130) is provided on the top of the spacer (120) so as to be tiltable rearward, and the point at which the angle of the backrest (130) is adjusted with respect to the spacer (120) corresponds to a point (P) at which the lumbar of a user body sitting on the seat (110) is curved inward.

A chair for reducing a load on the buttocks and the waist, and, to a chair (100) includes a seat (110) and a backrest (130) and further comprising a spacer (120) protruding upward from the rear end of the seat (110), wherein the bottom of the backrest (130) is provided on the top of the spacer (120) so as to be tiltable rearward, and the point at which the angle of the backrest (130) is adjusted with respect to the spacer (120) corresponds to a point (P) at which the lumbar of a user body sitting on the seat (110) is curved inward.

The present invention is directed to a portable folding chair including a central assembly having an upper portion and a lower portion. The lower portion may be connectable to the upper portion so that the upper portion may swivel with respect to the lower portion. The portable folding chair may include leg members attached to the lower portion of the central assembly. Each of the leg members may be moveable between a folded position and a deployed position. The portable folding chair may further include seat members that may be attached to the upper portion of the central assembly. Each of the seat members may be moveable between a folded position and a deployed position.

The device of the present invention allows a user to adjust the back of a chair to a desired reclining angle without having to physically stand up and manually adjust the back of the chair. More specifically, the tilting mechanism provides a remote control for the user to adjust the back of the chair through the touch of a button and moves the chair back from a first position to a second position as well as through a number of angles of inclination.

The device of the present invention allows a user to adjust the back of a chair to a desired reclining angle without having to physically stand up and manually adjust the back of the chair. More specifically, the tilting mechanism provides a remote control for the user to adjust the back of the chair through the touch of a button and moves the chair back from a first position to a second position as well as through a number of angles of inclination.

A dynamic furniture system includes a first frame portion; a set of rollers mounted to the first frame portion; a second frame portion including one or more rockers having a roller-interface surface having a curved profile; wherein the set of rollers interface with the roller-interface surface of the rockers such that the second frame portion is moveable relative to the first frame portion; a set of one or more electromagnets mounted to or integrated with the first frame portion or the second frame portion; a set of one or more magnetically-interactive elements mounted to or integrated with a different one of the first frame portion or the second frame portion; and an electronic control system configured to vary a parameter of electrical energy supplied to the set of electromagnets over time to induce back and forth motion of one of the first frame portion or the second frame portion.

In one or more embodiments, a folding chair is provided having a frame, a seat operably connected to the frame, a backrest operably connected to the frame, and a counterbalance assembly, among other components. The backrest is configured to move between an upright position and a reclined position. The counterbalance assembly is configured to apply a counterbalance force to the backrest. In one or more arrangements, the counterbalance assembly is configured to provide a counterbalance force to move the backrest to the upright position in absence of an opposing force. In one or more arrangements the counterbalance assembly is configured to hold the backrest at one or more intermediate positions between the upright position and the reclined position. In one or more arrangements the counterbalance assembly is configured to increase the counterbalance force applied to the backrest at one or more intermediate positions between the upright and reclined positions.

Disclosed is an underframe with an improved structure. The underframe includes an underframe body, an operating handle, a reclining pull rope and a gas spring pull rope, a cushion back-and-forth moving mechanism being installed on the outer side of the underframe body, the operating handle being installed through a left outer wall of the underframe body at a lower end of the cushion back-and-forth moving mechanism, a backrest installed on a rear end of the underframe body through a backrest connecting rod; and a reclining elastic adjusting mechanism is arranged at a front end of an inner wall of the underframe body, a backrest angle adjusting mechanism is arranged at the inner wall of the underframe body on a right side of the reclining elastic adjusting mechanism, a cushion height adjusting mechanism is fixedly connected in the underframe body.

Disclosed is an underframe with an improved structure. The underframe includes an underframe body, an operating handle, a reclining pull rope and a gas spring pull rope, a cushion back-and-forth moving mechanism being installed on the outer side of the underframe body, the operating handle being installed through a left outer wall of the underframe body at a lower end of the cushion back-and-forth moving mechanism, a backrest installed on a rear end of the underframe body through a backrest connecting rod; and a reclining elastic adjusting mechanism is arranged at a front end of an inner wall of the underframe body, a backrest angle adjusting mechanism is arranged at the inner wall of the underframe body on a right side of the reclining elastic adjusting mechanism, a cushion height adjusting mechanism is fixedly connected in the underframe body.

A dynamic furniture system includes a first frame portion; a set of rollers mounted to the first frame portion; a second frame portion including one or more rockers having a roller-interface surface having a curved profile; wherein the set of rollers interface with the roller-interface surface of the rockers such that the second frame portion is moveable relative to the first frame portion; a set of one or more electromagnets mounted to or integrated with the first frame portion or the second frame portion; a set of one or more magnetically-interactive elements mounted to or integrated with a different one of the first frame portion or the second frame portion; and an electronic control system configured to vary a parameter of electrical energy supplied to the set of electromagnets over time to induce back and forth motion of one of the first frame portion or the second frame portion.