| 摘要 |
A double tubed door hinge for automatically closing a door comprises a two-tube base, a pair of torsion springs disposed to respective tubes therein and urged at two ends by a pair of first twisting members and a pair of second twisting members, and retained by a pair of lug members and a pair of axle rods. The improvement has been characterized in that an annular sleeve is placed between the first twisting member and the upper rim of the tube and a splitting small tube disposed into the first and second twisting members. In addition to that both the twisting members and the annular sleeve are made from reinforced plastic material and the splitting small tube is made from anti-friction material. So that the door hinge is durable and provides a smooth operation without causing any noise.
|
