ELECTRIC DISCHARGE MACHINING POWER CIRCUIT SWITCHING SWITCH DEVICE AND SWITCHOVER DEVICE

摘要

PROBLEM TO BE SOLVED: To independently provide a movable body for turning a switch on and off and a terminal provided in the exterior and to have not only the merit of relatively less loss of electrical energy than hitherto by having the switch interior completely hermetic but also preventing the switch from causing poor insulation. SOLUTION: A first terminal C to be installed on the outside of a storage body 11 is provided on a conductor 11D watertightly fitted so as to compose a part of the storage body 11. A first contact point S1 of the conductor 11D and the first contact point S1 of a piston rod 12B of the movable body 12 are constantly in continuity through a first contact 13 in good contact condition regardless of the movement of the movable body 12B for opening and closing the switch. A second contact point S2 provided in front of a flange 12A of the movable body 12 increases the electrical contact area and lessens energy loss. A second terminal T provided on a conductor 11E composing a part of the storage body 11 and watertightly incorporated therein is in continuity with the flange 12A of the movable body 12 through the second contact point S2.