| 摘要 |
A hydraulic actuator comprising a spool valve (24) for switching an oil circuit through which pressure oil produced by a pressure oil producing mechanism flows, the spool valve (24) being disposed so that it is slidable in a direction orthogonal to a piston rod (18), a columnar grip handle (34) to be gripped by the operator and attached to the outside of a main body casing (5) in parallel with the piston rod (18), the grip handle (34) being turnable around the axis of the grip handle (34), the spool valve (24) and the grip handle (34) being connected to each other through a cam mechanism (29, 30, 31). The grip handle (34) is turned to vertically move the spool valve (24), controlling the direction of flow of the pressure oil.
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