When the inspiration from the bed legs, and then apply the force, analysts said, is in the X axis and the Y axis ' and '. With the principle of the right of the results, therefore, the following equation:
When the force acting on the leg of the bed. Therefore, the above analysis to the axis X 'axis and Y' with the force of a movement, as the following equation.
When the force from the area towards the bed legs. The force analysis in the core X "core and Y". With the principle to the resultant force of the movement has also the following equations