Disclosed is a drive unit operable to translate and rotate a shaft, the drive unit including: (i) a hollow electric motor having a rotor, (ii) a fluid cylinder, (iii) means for connecting the shaft to the rotor of the hollow electric motor, (iv) means permitting the shaft to move lengthwise coupled with the fluid cylinder, and (iv) means connecting the fluid cylinder to the shaft, whereby the shaft may be rotated by the hollow electric motor and moved lengthwise by the fluid cylinder, and wherein the fluid cylinder has an outer wall coupled with the rotor of the hollow electric motor.
CROSS-REFERENCE TO RELATED APPLICATIONS
This patent application is a continuation patent application of prior U.S. patent application Ser. No. 10/873,288, which now U.S. Pat. No. 7,316,553 was filed 23 Jun. 2004 (Applicant reference number H-723-0-US). This divisional patent application also claims the benefit and priority of U.S. patent application Ser. No. 10/873,288, filed 23 Jun. 2004.
