Remote-controlled actuator

A remote controlled actuator comprising:

• a drive unit housing including a tool rotating drive source;
• a spindle guide section of an elongated configuration, a base end of the spindle guide section being connected to the drive unit housing;
• and
• a distal end member fitted to the spindle guide section through a distal end member connecting unit for alteration in attitude,
• wherein the distal end member rotatably supports a spindle to hold a tool,
• the spindle guide section includes a rotary shaft to transmit rotation of the tool rotating drive source to the spindle, a guide hole extending to opposite ends of the spindle guide section, and an attitude altering member reciprocally movably inserted within the guide hole to alter the attitude of the distal end member,
• the attitude altering member includes a spherical tip end held in contact with an inclined end face of the distal end member connecting unit, the attitude altering member being configured to selectively advance or retract,
• an attitude altering drive source to selectively advance or retract the attitude altering member is provided within the drive unit housing and
• a connection device is provided to detachably connect the spindle guide section with the drive unit housing,
• wherein the rotary shaft includes an inside-guide-section portion disposed in the spindle guide section and an inside-housing portion disposed in the drive unit housing,
• the inside-guide-section portion and the inside-housing portion are coupled by a coupling so as to be detachable from each other in an axial direction of the rotary shaft and to transmit a rotation about an axis of the rotary shaft,
• the spindle guide section includes an end portion proximal to the drive unit housing, the end portion being provided with a flange section detachably connected to the drive unit housing
• the connection device includes a plurality of bolts that connect the flange section with the drive unit housing, and
• a phase alignment mechanism to align phases of the spindle guide section and of the drive unit housing about an axis of the rotary shaft with each other, the phase alignment mechanism being disposed at a connecting portion where the spindle guide section and the drive unit housing are connected.