New Well Screen

Issue 11 and Volume 77.

New Well Screen The object of this invention is to avoid any tendency to clog with earth by the perforations of the screen while it is driven into the ground, in which the protecting lips or tongues are normally closed over the associated perforations during the driving or inserting of the screen to its position of use and in which the tongues are subsequently forced outwardly to open the perforations; to provide a structure which in its normal condition presents a smooth continuous exterior surface facilitating such driving or insertion of the screen; and comprising an inner perforated pipe and an outer pipe formed of a metal ribbon wound spirally around the inner pipe coil on coil and split longitudinally of the pipe on opposite sides of each perforation to define tongues which are normally closed to present a smooth continuous exterior surface during insertion of the screen and which…

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