| 摘要 |
PURPOSE: An actuator having a bush is provided to expand a rotational angle of a driving rod by slantingly forming a head portion of the bush positioned between a protrusion and a coupling pin with respect to a rotating direction of the driving rod. CONSTITUTION: An actuator(100) is used for performing an external pressure test for a structure having a curved external appearance. The actuator(100) has a cylinder(110) operated by receiving hydraulic or pneumatic pressure, and a driving rod(130) inserted into the cylinder(110) so as to flexibly operate according to an operation of the cylinder(110). A plurality of supporting rods(120) is provided to support the driving rod(130). A first spherical-surface bearing(140) is installed at an end of the driving rod(130). In addition, a second spherical-surface bearing is installed at a bottom of the cylinder(110).
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