Abstract: A new torque drive mechanism is disclosed between a reversible rotatable square bar means for rotating a washer while providing free longitudinal movement of the square rod in the washer, and for providing free passage of liquid therebetween the bar and the washer.

Abstract: A method for cleaning a helical spring screen that has become clogged up while filtering liquid deep in a well and while simultaneously producing filtered liquid from the well comprises (1) positioning a cleaning washer with a large opening therein between two coils at one end of the helical spring screen, and (2) rotating the cleaning washer with a rotatable rod of a smaller circumference between all of the coils to the other end of the spring screen for cleaning all foreign material from between the coils of the spring screen, and for simultaneously producing filtered liquid through the cleaning washer large opening while sliding over the rod from one end to the other. A method for forming or assembling a self-cleaning helical screen and two modifications of a new and improved self-cleaning helical spring screen are also disclosed herein.

Abstract: A method for cleaning a helical spring screen that has become clogged up while filtering liquid deep in a well and while simultaneously producing filtered liquid from the well comprises (1) positioning a cleaning washer with a large opening therein between two coils at one end of the helical spring screen, and (2) rotating the cleaning washer with a rotatable rod of a smaller circumference between all of the coils to the other end of the spring screen for cleaning all foreign material from between the coils of the spring screen, and for simultaneously producing filtered liquid through the cleaning washer large opening while sliding over the rod from one end to the other. A method for forming or assembling a self-cleaning helical screen and two modifications of a new and improved self-cleaning helical spring screen are also disclosed herein.