1. Field of the Invention
The present invention generally relates to an adjustable back cushion structure, more particularly to a back cushion structure that is capable of adjusting best sitting postures according to demands.
2. Description of the Prior Art
Most users who need to sit on chairs of offices or cars for a long time may purchase back cushions for supporting the figures of the vertebras of the waists or backs thereof in order to achieve the purpose of comfort feeling of sitting for a long time.
Such back cushions in the market include a variety. Some are made by that of directly copying the figure of a vertebra, or some have adjusting mechanisms. However, those prior back cushions have following disadvantages:    1. Due to everybody their own unique figure and sitting posture, the effect of a single individual support cannot be achieved if purchasing a back cushion made by that of directly copying the figure of a single vertebra.    2. Although a back cushion with adjusting mechanisms could achieve the effect of adjustment, the weight of the back cushion may be gained since a mechanism should be assembled for the function of adjustment. Hence, the cost is raised to bring out the problem of an expensive product. So, a financial burden may happen to a consumer.
Thus, such prior arts still have some difficulties need to be solved.
The inventor of the present invention has hardly worked on the issue to develop the adjustable back cushion structure of the present invention, and it will be discussed as below.