Adjusting mechanism with a helical spring of large diameter

An adjusting mechanism with a helical spring of large diameter, comprising:

• a helical spring of large diameter of which one end forms a wire end and the other end forms a ringed end;
• a flexible inner tube, an outer bore of one end of the flexible inner tube works with an inner bore of flexible outer tube to axially glide and the other end of the flexible inner tube is provided with a spring support seat that contacts a surface of a ringed end of the helical spring of large diameter;
• a flexible outer tube, in which the inner bore works with the outer bore of the flexible inner tube to glide, the outer bore is the formed with an axial groove and a thread, in which the axial groove match with a screw that is fixed to and pierces through a tube wall of a spring-fixed base;
• a pre-compressive adjustment knob that is hollow, of which a thread of an inner bore of the pre-compressive adjustment knob match with the thread of the outer bore of the flexible outer tube;
• a spring-fixed base that is hollow, of which the inner bore covers the outer bore of the flexible outer tube and the outer bore is formed with a spiral spring groove and a plurality of screws which pierce through a tube wall of the spring-fixed base, in which the helical spring of large diameter of the wire end is fixed to the whole spiral spring groove;
• and
• a rotation member being hollow, of which the inner bore is formed with a thread groove corresponding to a shape the helical spring of large diameter fixed to the spring-fixed base.