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A remote controlled actuator includes a spindle guide section of an elongated configuration, a distal end member fitted to a tip end of the spindle guide section for alteration in attitude, and a drive unit housing to which a base end of the spindle guide section is connected. The distal end member

A remote controlled actuator includes a spindle guide section of an elongated configuration, a distal end member fitted to a tip end of the spindle guide section for alteration in attitude, and a drive unit housing to which a base end of the spindle guide section is connected. The distal end member rotatably supports a spindle then holding a tool. The spindle guide section includes a hollow outer shell pipe, a rotary shaft and a guide pipe, and an attitude altering member for altering an attitude of the distal end member is inserted within the guide pipe. A hollow of the outer shell pipe includes a round hole portion at a center and a grooved portion depressed radially outwardly from the round hole portion. The rotary shaft is arranged within the round hole portion whereas the guide pipe is arranged within the grooved portion.

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1. A remote controlled actuator which comprises a spindle guide section of an elongated configuration, a distal end member fitted to a tip end of the spindle guide section through a distal end member connecting unit for alteration in attitude, and a drive unit housing to which a base end of the spin

1. A remote controlled actuator which comprises a spindle guide section of an elongated configuration, a distal end member fitted to a tip end of the spindle guide section through a distal end member connecting unit for alteration in attitude, and a drive unit housing to which a base end of the spindle guide section is connected; in which the distal end member rotatably supports a spindle for holding a tool;in which the spindle guide section includes a hollow outer shell pipe forming an outer shell for the spindle guide section, a rotary shaft provided within a hollow of the outer shell pipe, which hollow extends to opposite ends of the outer shell pipe, for transmitting rotation of a tool rotating drive source, provided within the drive unit housing, to the spindle, a guide pipe provided within the hollow and having a guide hole so as to extend to opposite ends thereof, and one or a plurality of attitude altering members reciprocally movably inserted within the guide pipe for altering the attitude of the distal end member;in which one or a plurality of attitude altering members is, while a tip end thereof is held in contact with the distal end member, selectively advanced or retracted one at a time;in which an attitude altering drive source for selectively advancing or retracting the or each attitude altering member is provided within the drive unit housing; andin which the hollow has a round hole portion at a center and a grooved portion depressed radially outwardly from the round hole portion, and the rotary shaft is arranged within the round hole portion whereas the guide pipe is arranged within the grooved portion. 2. The remote controlled actuator as claimed in claim 1, in which the geometric moment of inertia of the outer shell pipe is of a value equal to or larger than ½ of a solid shaft of the same outer diameter. 3. The remote controlled actuator as claimed in claim 1, in which the or each attitude altering member comprises a plurality of force transmitting members arranged in a row extending in a direction along a lengthwise direction of the guide pipe, or a wire extending in a direction along the lengthwise direction of the guide pipe. 4. The remote controlled actuator as claimed in claim 1, in which the guide pipe and the attitude altering member inserted within the guide pipe are each provided at two or three locations, and the attitude altering drive source is provided for each of the attitude altering members so that the attitude of the distal member can be altered and maintained in dependence on the balance of respective working forces of the attitude altering members at the two or three locations acting on the distal end member. 5. The remote controlled actuator as claimed in claim 1, further comprising a rolling bearing for rotatably supporting the rotary shaft within the spindle guide section, the rolling bearing having an outer diametric surface supported by the guide pipe. 6. The remote controlled actuator as claimed in claim 1, further comprising a cooling unit for cooling the tool with a coolant liquid flowing inside the outer shell pipe, or a coolant liquid supplied from an outside. 7. The remote controlled actuator as claimed in claim 1, in which when the angle formed between a center line of the rotary shaft and a perpendicular line normal to the tangential line at a point of contact between the distal end member and the attitude altering member is expressed by α, the angle α is within the range of 0° to 45°. 8. The remote controlled actuator as claimed in claim 1, further comprising a plurality of rolling bearings for rotatably supporting the rotary shaft within the spindle guide section and a spring element for applying a preload to the rolling bearings, the spring element being provided between the neighboring rolling bearings. 9. The remote controlled actuator as claimed in claim 8, further comprising a cooling unit for cooling the bearings with a coolant liquid flowing inside the outer shell pipe. 10. The remote controlled actuator as claimed in claim 1, further comprising a cooling unit having an interior, into which a coolant liquid is injected through a coolant liquid injecting hole defined in the vicinity of a base end of the spindle guide section, and capable of feeding it towards the tip end side through the interiors of the spindle guide section and the distal end member and finally discharging it from the distal end member towards the tool; and a sealing unit for avoiding an ingress of the coolant liquid from the inside of the spindle guide section into the inside of the drive unit housing. 11. The remote controlled actuator as claimed in claim 10, in which the sealing unit comprises a slide bearing for supporting the rotary shaft at a location on the side of the base end and remote from the coolant liquid injecting hole. 12. The remote controlled actuator as claimed in claim 10, in which the sealing unit includes a shielded chamber provided in the drive unit housing and communicated with the inside of the spindle guide section at the base end of the spindle guide section, the pressure inside the shielded chamber being chosen to be higher than the atmospheric pressure. 13. The remote controlled actuator as claimed in claim 1, further comprising a friction reducing unit provided between an inner surface of the guide hole and the attitude altering member for reducing a frictional force developed therebetween. 14. The remote controlled actuator as claimed in claim 13, in which the friction reducing unit comprises a coating layer coated on at least one of the inner surface of the guide hole and a surface of the attitude altering member. 15. The remote controlled actuator as claimed in claim 13, in which the friction reducing unit comprises a liquid for lubrication existing within the guide hole.