Electrical discharge boring machine
Patent 4705932 Issued on November 10, 1987. Estimated Expiration Date: 
October 11, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 11, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2490302 2650979 2807706 3469056 3472993 3609279 3688074 3851135 Portable disintegrator Electrical discharge machining apparatus InventorsAssigneeApplicationNo. 06/795699 filed on 10/11/1985US Classes:219/69.2, Vibrating electrodes or workpiece219/69.14Dielectric composition and purificationExaminersPrimary: Pellinen, A. D.Assistant: Evans, Geoffrey S. Attorney, Agent or FirmInternational ClassesB23H 7/26 (20060101)B23H 9/14 (20060101) B23H 9/00 (20060101) Foreign Application Priority Data1984-02-15 JPAbstractAn electrical discharge boring machine including: a main unit (12) which is moved vertically relative to a workpiece (W); a rotary chuck (14) attached to the lower part of the main unit (12) for holding a hollow bar electrode (16); a guide (36) for slidably guiding the hollow bar electrode (16) near the workpiece (W); a nozzle unit (40) provided on the lower part of the guide for supplying a machining liquid; a rotary joint (28) for introducing the machining liquid into the hollow bar electrode; and a connection (34) for supplying electric power for electrical discharge machining to the hollow bar electrode. | |
