Chairback structure capable of providing dynamic support for users in different sitting postures

A chairback structure capable of providing dynamic support for users in different sitting postures, comprising:

• a first chairback;
• a chairback support, the chairback support having an end fixedly connected to the first chairback and an end movably connected to a seat;
• and
• a horizontal movement mechanism, the horizontal movement mechanism having an end sleeved with the chairback support and an end provided with an elastic lifting mechanism, the elastic lifting mechanism having an end fixedly connected to the horizontal movement mechanism and an end provided with a second chairback, and the second chairback being movably connected to the elastic lifting mechanism;
• wherein in operation, the second chairback moves forward and backward as well as upward and downward by means of the horizontal movement mechanism and the elastic lifting mechanism;
• wherein the horizontal movement mechanism comprises a sliding tube with an open end, a first spring and an adjusting knob, a fixing tube with two open ends is arranged on the chairback support, and the chairback support is disposed around the fixing tube;
• the adjusting knob is movably connected to an end of the fixing tube;
• a positioning pillar is arranged on an end surface of the adjusting knob and sequentially sleeved with the first spring, the sliding tube and the fixing tube;
• the sliding tube is in sliding fit with the fixing tube, and an end, close to the elastic lifting mechanism, of the sliding tube is fixedly connected to the elastic lifting mechanism;
• and the first spring has an end fixed to the end surface of the adjusting knob and an end abutting against an inner end surface of the sliding tube;
• wherein at least one sliding wheel is symmetrically arranged on an outer wall of the sliding tube and fixedly connected to the sliding tube;
• at least one guide pillar is arranged on an inner wall of the fixing tube and integrally formed with the fixing tube, guide grooves are formed in the guide pillars, sides, provided with the guide grooves, of two said guide pillars face each other, and the at least one sliding wheel is inlaid between the two guide grooves.

A chairback structure capable of providing dynamic support for users in different sitting postures, comprising:

• a first chairback;
• a chairback support, the chairback support having an end fixedly connected to the first chairback and an end movably connected to a seat;
• and
• a horizontal movement mechanism, the horizontal movement mechanism having an end sleeved with the chairback support and an end provided with an elastic lifting mechanism, the elastic lifting mechanism having an end fixedly connected to the horizontal movement mechanism and an end provided with a second chairback, and the second chairback being movably connected to the elastic lifting mechanism;
• wherein in operation, the second chairback moves forward and backward as well as upward and downward by means of the horizontal movement mechanism and the elastic lifting mechanism;
• wherein the horizontal movement mechanism comprises a sliding tube with an open end, a first spring and an adjusting knob, a fixing tube with two open ends is arranged on the chairback support, and the chairback support is disposed around the fixing tube;
• the adjusting knob is movably connected to an end of the fixing tube;
• a positioning pillar is arranged on an end surface of the adjusting knob and sequentially sleeved with the first spring, the sliding tube and the fixing tube;
• the sliding tube is in sliding fit with the fixing tube, and an end, close to the elastic lifting mechanism, of the sliding tube is fixedly connected to the elastic lifting mechanism;
• and the first spring has an end fixed to the end surface of the adjusting knob and an end abutting against an inner end surface of the sliding tube;
• wherein at least one limiting through-hole is formed in a wall of the sliding tube, a first connecting tube with an open end is formed on an outer wall of the fixing tube, the open end of the first connecting tube is sleeved with a limiting knob, the limiting knob is movably connected to the first connecting tube, a first through-hole is formed in a wall, connected to the sliding tube, of the first connecting tube, the limiting knob is fixedly connected to one end of a limiting pillar, and the other end of the limiting pillar is inlaid in the limiting through-hole by means of the first through-hole;
• wherein a first connecting pillar with two open ends is arranged in the first connecting tube, two opposite external threads are symmetrically arranged on an outer wall of the first connecting pillar, a second connecting tube with an open end is arranged on an end surface, connected to the limiting pillar, of the limiting knob, at least two second connecting pillars are symmetrically arranged on an inner wall of the second connecting tube, and the two second connecting pillars clamp the first connecting pillar and fit the external threads.