| 摘要 |
<p>A joint element for a flexible backrest of seat is made of an elastic material and includes a base (5) and elastic arms extending toward two ends. The base is made of a rigid material and is embedded in the joint element. In the middle of the base are provided a mounting hole (6) and an inner hexagonal counter-bore (7). A sleeve pipe (9) is deeply embedded in an end of either elastic arm and is made of the same material as the base. In the middle of the sleeve pipe are provided with a through hole (1) and a counter-bore (2). The left and right elastic arms are asymmetrical. The left elastic arm is of larger length, and has a surface composed of a bevel (4) and a camber (3). The right elastic arm is of less length, and is provided with a limit slot (8) thereon. The lower surface of the joint element is designed as a camber. Said joint element has the advantages of simple structure, safety and comfort.</p> |
