Patent ID: 6073935
Filing Date: 2000-06-13
Classification: B23H,Y10S

Abstract:
A leaktight seal device for a lower arm of a spark erosion machine wherein said lower arm extends through a window in a side wall of a tank of said spark erosion machine, said seal device comprising:a) a flexible, roll-up metal band positioned outside said tank and spanning said window in said side wall, said metal band having a hole through which said lower arm passes from outside said tank to inside said tank;b) two roller devices installed outside said tank, one attached to each end of said metal band, one of said roller devices installed at one side of said window and the other of said roller devices installed at the other side of said window, said roller devices allowing for lateral movement of said metal band across said window;c) a structural frame installed outside said tank, framing said window and through which said metal band moves, said structural frame forming a leaktight seal between said tank and said metal band;d) a semi-leaktight seal installed in said hole in said metal band and forming a semi-leaktight seal between said lower arm and said metal band wherein said semi-leaktight seal comprises an inner flange which holds a ring of alveolar material into place in a ring-shaped groove, and an outer counterflange, which holds a ring of springy material in place up against a cover thereby forming said semi-leaktight seal; ande) an overflow channel installed below said window for catching fluid which leaks from said tank.