Patent ID: 8794100

Claim:
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 for holding a tool; the spindle guide section includes a rotary shaft for transmitting 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 for altering the attitude of the distal end member; the attitude altering member includes a tip end held in contact with the distal end member which is configured to selectively advance or retract; an attitude altering drive source for selectively advancing or retracting the attitude altering member is provided within the drive unit housing; a connection device is provided for detachably connecting the spindle guide section with the drive unit housing; and a space is formed between the spindle guide section and the drive unit housing, the space being configured to be filled with a pressurized air and form a pressurized region with a pressure higher than that of inside of the spindle guide section and higher than that of inside of the drive unit housing, the space including a pressurized air feed hole configured to feed the pressurized air into the space, wherein 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 flange section having a protrusion, the protrusion of the flange section is fitted to a cavity provided in the drive unit housing.