Structure for adjusting support force of lumbar pillow, and chair

A chair, comprising the structure for adjusting the support force of the lumbar pillow, wherein the structure for adjusting the support force of the lumbar pillow comprises:

• a backrest bracket, a lumbar pillow, an elastic support, and an adjustment mechanism;
• wherein
• a top of the lumbar pillow is flexibly connected to a front side of the backrest bracket;
• a first end of the elastic support is connected to a back of the lumbar pillow, and a second end of the elastic support is provided with a slider, the slider being provided with an internally threaded hole;
• the adjustment mechanism comprises a lead screw, wherein the lead screw runs through the internally threaded hole, the lead screw is rotatably connected to the backrest bracket, and an extension direction of a rotation axis of the lead screw with respect to the backrest bracket is consistent with a vertical direction of the backrest bracket;
• and
• in response to the lead screw rotating with respect to the backrest bracket, the slider slides upward and downward along the vertical direction of the backrest bracket to change a support angle of the elastic support for the lumbar pillow, such that a magnitude of the support force of the elastic support to the lumbar pillow is adjusted.