Abstract: A retracting internal tube cutter for severing a tube from the interior is disclosed. The tube cutter includes a pair of swing arms mounted for pivotal outward displacement for effecting cutting of the tube. A retractor collar biased by a spring is mounted about the swing arms such that the collar maintains the swing arms in an insertion position except when the cutter is rotated. When the cutter is rotated the arms are forced outwardly causing the retractor collar to retract such that the cutter may sever the workpiece where desired. Upon discontinuance of rotation of the tube cutter, the retractor collar is urged into the insertion position withdrawing the cutter arms from the workpiece such that the tube cutter may be removed from the tube.

Abstract: The cutter blade and mandrel of a tube cutter coact through sloped surfaces having a tongue-and-groove connection. Relative axial movement between the mandrel and cutter blade causes the cutter blade to move radially inward or outward and the tongue-and-groove connection permits the mandrel and cutter blade to rotate as a unit to thereby increase the effective cutter height of the blade by the height of the underlying mandrel.

Abstract: A torque control for a fluid operated motor includes a first gear to be driven through operation of the motor and a second gear in driving engagement with said motor and maintained in a generally stationary position during normal operation thereof. The torque control further includes a drive mechanism connected to the first gear and to a load to be rotationally driven through operation of the motor. A valve is provided in the fluid supply to the motor to open and close the supply of fluid thereto. Disconnect means is operatively connected to the second gear and the valve to maintain said valve in an open position to permit supply of fluid to said motor when the second gear is stationary. The second gear rotates when the torque required from the motor to rotate the load exceeds a predetermined magnitude to move the disconnect means relative to the valve to close the valve to terminate the supply of fluid to the motor.

Abstract: A tube cleaning device comprising a body extending both in a longitudinal direction and a transverse direction and defining an opening in a first end and a longitudinally extending recess in communication with the opening, wherein the perimeter of the recess is larger than the perimeter of the opening. The cleaning device further comprises a neck extending longitudinally from a second end of the body and having a perimeter less than the perimeter of the opening, a plug extending longitudinally from the neck and having a perimeter larger than the perimeter of the opening but smaller than the perimeter of the recess, and a scraper extending from a side of the body.