Joseph F Alexander

US Patent:

RE359440, Nov 3, 1998

Filed:

Nov 30, 1994

Appl. No.:

8/346901

Inventors:

F. Thomas Driver - Saint Charles MO
Joseph A. Alexander - Memphis TN
Lloyd G. Buchanan - Collierville TN

Assignee:

Insituform (Netherlands) B.V.

International Classification:

B29C 6336

US Classification:

264570

Abstract:

In a tube eversion apparatus a first chamber in which the eversion pressure in developed is controllably sealed by a sphincter-type valve, the valve being in turn actuated by pressure developed in a preferably separately controllable and adjustable second chamber, another chamber preferably being provided above the sphincter-type valve for containing a supply of liquid and limiting turbulence from any escape of fluid past the sphincter-type valve, the other chamber also providing apparatus for supplying heated fluid to a lay-flat hose adapted to be pulled through the sphincter-type valve by the tube being. �. exerted. !. . Iadd. everted. Iaddend. Use of the improved apparatus involves appropriate modifications of the usual eversion process involving applying and controlling the everting pressure and the pressure exerted against the sphincter-type valve by the fluid in the second chamber.