Patent ID: 8789864

Claim:
A spring box for a door handle, comprising: a base piece having a first through hole in the center and a gap at a side connected to said first through hole; a front plate having a second through hole in the center aligning with said first through hole and a curved second limiting slot adjacent to and along an upper section of said second through hole; a back plate having a third through hole in the center aligning with said first through hole, a curved third limiting slot adjacent to and along an upper section of said third through hole, and two corresponding flakes configured on an inner side of said back plate towards a front direction; a rotational piece having an axle with an indentation at a front end and a sliding element on a circumference of said rotational piece, said sliding element having a blocking piece, a groove, a weight block at an end of said sliding element, a notch at another end of said sliding element, and a pin protruding along an axial direction of said rotational piece adjacent to said weight block; and a torsion spring having a first end embedded between said two flakes and a second end in said notch; and wherein said rotation piece is placed in said first through hole; said rotational piece and said base piece are sandwiched between said front and back plates; said two flakes are embedded in said gap; said pin is embedded in one of said second and third limiting slots so that, together with said blocking piece, the rotation of said rotational piece is limited and confined; and wherein said door handle has an axle embedded into said indentation; and, by the weight of said weight block and the resilience of said torsion spring, said door handle is restored to a default position after being turned clockwise or counterclockwise.