Patent ID: 8613483

Claim:
A pad structure for a chair back comprising: a pad, an adjusting member disposed on a back side of the pad, a rail plate connected with the adjusting member, a slideable plate slideably mounted to the rail plate, a straight slot having a plurality of serrate recesses extending from the straight slot, with the straight slot and the plurality of serrate recesses formed in the rail plate, a column projecting from the slideable plate and into the straight slot and movable into one of the plurality of serrate recesses, and a moveable piece movably mounted to the slideable plate, with the column mounted to the moveable piece, wherein the pad is capable of being adjusted frontward and backward, wherein the adjusting member includes a positioning panel to axially connect with a toothed edge of each of first and second toothed arms, and another end of the first toothed arm is secured on a face of the rail plate by using a first connector, wherein another end of the second toothed arm is coupled with the slideable plate by a second connector to form a multi-section engaging design; wherein movement of the slideable plate along the rail plate changes a relative angle between the first and second toothed arms; and wherein the slideable plate includes a groove receiving the moveable piece, with the groove including a notch, with one end of the moveable piece slideable in the notch, with a spring sandwiched between the moveable piece and a portion of the groove.