Patent ID: 6407356
Filing Date: 2002-06-18
Classification: B23H

Abstract:
An electric discharge machining device comprising:a base having an oil storage compartment and an upright column; a support column fastened at one end with said base and located in said oil storage compartment; an oil tank provided with a receiving space having an open top, said oil tank provided in the bottom with a drainage hole whereby said support column is put through said drainage hole; a work platform fastened with other end of said support column and located in said receiving space of said oil tank, said work platform being greater in area than said drainage hole of said oil tank; a draining pipe fitted over said support column such that one end of said draining pipe is connected with said drainage hole, and that other end of said draining pipe is in communication with said oil storage compartment; a linear actuator fastened with said upright column and connected with one side of said oil tank for actuating said oil tank to slide along the longitudinal direction of said support column between an upper position and a lower position, said drainage hole being sealed off by said work platform at such time when said oil tank is located at said upper position, thereby enabling said receiving space of said oil tank to be filled with process oil which is kept in said oil storage compartment of said base, whereby the process oil in said receiving space of said oil tank is drained out to said oil storage compartment via said drainage hole and said draining pipe at such time when said oil tank is actuated by said linear actuator to slide from said upper position to locate at said lower position.