| 摘要 |
Provided in the present invention is an angular head having an enhanced rotational stiffness which comprises a head unit comprising a body and a first flange extended from the body and having a first hole; a housing unit extended from a pipe body and comprising a second flange having a second hole; a rotation axis unit including a shaft inserted into the first hole and the second hole to connect the first flange with the second flange to be rotated with respect to the second flange and a frictional member extended from the shaft and fixed to the housing unit; and a covering unit connected with the head unit and arranged to be in contact with the friction member to generate a frictional force. |
