Durable pivotal connecting device for table lamp

A durable pivotal connecting device for a table lamp between a base and a supporting post of said lamp which has a lampshade and a lamp pipe, said supporting post is connected to a rotation seat which is located in said base and is pivotably assembled with said durable pivotal connecting device for rotation adjustment of said supporting post for illumination;

• said pivotal connecting device is comprised of two sets of curved spring leaves, two connecting rods, a transverse bar and an adjusting bolt and is characterized in that:
• said spring leaves are arciform, and each includes a connecting and and is split to form a slit, a positioning end and an adjustment end;
• screws are used to lock said connecting ends and said positioning ends of said arciform spring leaves onto the inner wall of said base, said adjustment ends are not fixed and in the state of capability of elastically reducing and enlarging diameters of said spring leaves;
• said connecting rods are respectively locked onto said adjustment ends of said arciform spring leaves, the other ends of said connecting rods are connected to said transverse bar;
• the center of gravity of said transverse bar is provided with a guide hole to hold therein and allow passing through of the stem of said adjusting bolt from outside of said base, in order that said transverse bar is moved up and down by adjustment of said adjusting bolt;
• with the assembly stated above and by adjustment of said adjusting bolt, said adjustment ends of said arciform spring leaves are adapted to be operated to generate elastic binding action force on said rotation seat in said base and are capable of elastically reducing and enlarging diameters of said spring leaves.