Patents by Inventor Donald W. Carkhuff
Donald W. Carkhuff has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5681489Abstract: A plasma arc torch includes a torch body defining a discharge axis, an electrode coaxially aligned on the discharge axis, a nozzle assembly positioned adjacent the discharge end of the electrode, and a heat shield removably secured on the torch body. A power supply delivers electrical current to the electrode to create an electrical arc, and a plasma gas is delivered so as to surround the arc. Also, a pressure sensing system is provided for sensing the pressure of the plasma gas and for disabling the power supply if there is insufficient gas pressure, such as when the heat shield is removed.Type: GrantFiled: December 13, 1995Date of Patent: October 28, 1997Assignee: The ESAB Group, Inc.Inventor: Donald W. Carkhuff
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Patent number: 5414237Abstract: A plasma arc torch for minimizing delay in exchanging gases within the torch. The torch includes a metallic electrode, a conductive nozzle spaced apart from the electrode, and a gas plenum between the electrode and nozzle. Two gas passageways are provided for communicating non-oxidizing and oxidizing gases into the plenum. A plenum inlet check valve is associated with each gas passageway and is located in close proximity to the plenum. The check valves are normally biased in a closed position but may be opened by gas pressure within the passageways to selectively introduce gas into the plenum. Solenoid valves located upstream of the plenum check valves regulate the pressure and flow of gas within the passageways so as to open and close the plenum check valves.Type: GrantFiled: October 14, 1993Date of Patent: May 9, 1995Assignee: The ESAB Group, Inc.Inventor: Donald W. Carkhuff
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Patent number: 5216221Abstract: A plasma arc torch has an outer heat shield removably secured onto the torch body. The heat shield includes an electrically conductive member secured on the interior surface of the heat shield and in electrical contact with the nozzle assembly or a nozzle assembly retainer member when the nozzle assembly and heat shield are secured onto the torch body. A closed loop electrical circuit is completed through a portion of the nozzle assembly and the electrically conductive member of the heat shield when both the nozzle assembly and the heat shield are secured onto the torch body. When the heat shield or the nozzle assembly are removed, the electrical circuit is open and the electrical voltage flow to the electrode is disabled.Type: GrantFiled: January 17, 1992Date of Patent: June 1, 1993Assignee: ESAB Welding Products, Inc.Inventor: Donald W. Carkhuff
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Patent number: 5214262Abstract: A plasma torch assembly that provides a removable and replaceable barrier to prevent catastrophic failure of a plasma arc torch following failure of an electrode. The torch assembly comprises the combination of an electrode body for providing an electrical path in a plasma arc torch, an electrode, and an electrode adaptor positioned between the electrode body and the electrode and formed of an electrically conductive material. The adaptor comprises an adaptor body portion having structure for removably fitting the adaptor body to the electrode body and structure for removably fitting the adaptor body to the electrode so that the adaptor forms an electrically conductive path between the electrode body and the electrode and contains features and components essential to the gas distribution.Type: GrantFiled: April 3, 1992Date of Patent: May 25, 1993Assignee: ESAB Welding Products, Inc.Inventor: Donald W. Carkhuff
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Patent number: 5162632Abstract: A plasma cutting and gouging torch has a torch body and a torch head that defines a longitudinal axis. A nozzle is aligned with the longitudinal axis and is secured to the torch head at the plasma discharge end for discharging plasma through the nozzle outlet and onto a workpiece. A handle is secured onto the head and extends outward from the torch head. A shield is secured to the torch head and extends substantially around the periphery of the torch head opposite the handle and extends along the surface of the handle confronting toward the nozzle. The shield extends in close, spaced relation to the torch head and handle to define a narrow, insulating air gap between the torch body and the shield. A flow of air may be introduced into the formed air gap to aid in cooling the torch body during cutting or gouging.Type: GrantFiled: August 13, 1991Date of Patent: November 10, 1992Assignee: ESAB Welding Products, Inc.Inventor: Donald W. Carkhuff
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Patent number: 5013885Abstract: A nozzle for use with a plasma arc torch having a first gas flow within the nozzle for engaging an electrode and generating a plasma and a second gas flow in surrounding engagement to the outer surface of the nozzle is disclosed. The nozzle includes an outer surface of substantially hourglass configuration in longitudinal cross-section so that the second gas remains in close contact with the outer hourglass surface of the nozzle to provide efficient heat transfer from the nozzle to the surrounding second gas flow.Type: GrantFiled: February 28, 1990Date of Patent: May 7, 1991Assignee: ESAB Welding Products, Inc.Inventors: Donald W. Carkhuff, Jeffrey S. Everett, Jule Conner
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Patent number: 4716269Abstract: Supplemental electrode cooling mechanisms are provided for a plasma arc torch, which mechanisms form a part of the gas flow mechanisms through the torch head for circulating the flowing gas through the current transfer assembly of the torch in direct contact with a maximum portion of the entire longitudinal extent of the surface of the upper portion of an electrode received within the current transfer assembly for additional cooling of the electrode to increase the life thereof, while maintaining desired seating of the electrode in the current transfer assembly and transfer of current to the electrode from the current transfer assembly.Type: GrantFiled: October 1, 1986Date of Patent: December 29, 1987Assignee: L-TEC CompanyInventor: Donald W. Carkhuff
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Patent number: 4580032Abstract: The plasma torch of the present invention includes safety control means which responds to the removal or partial removal of the torch heat shield from the torch body for interrupting the flow of plasma gas and a switch system responsive to the interruption of the flow of plasma gas for disengaging the power supply from the torch.Type: GrantFiled: December 27, 1984Date of Patent: April 1, 1986Assignee: Union Carbide CorporationInventor: Donald W. Carkhuff
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Patent number: 4315126Abstract: An arc cutting and gouging torch in combination with nozzle assemblies for suspending a carbon electrode and discharging a combined air stream relative to the carbon electrode centerline. The nozzle assemblies include exit orifices which are disposed in a non-parallel alignment relative to one another and the electrode to cause the air jet discharged from each exit orifice to merge at a location upstream of the arc and substantially about the centerline of the electrode.Type: GrantFiled: May 29, 1980Date of Patent: February 9, 1982Assignee: Union Carbide CorporationInventors: Peter R. Schaefer, Donald W. Carkhuff
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Patent number: 4105891Abstract: A metal inert gas welding torch having a wire guide assembly threadably secured at one end to a torch body and a collet nut assembly threadably secured to the other end of the wire guide assembly. A spidered collet is mounted in the collet nut assembly and forms a plenum chamber with the wire guide assembly and collet nut. A contact tip is gripped by the spidered collet and extends into the plenum chamber whereby the shielding gas cools the contact tip prior to the distribution of such gas into a nozzle.Type: GrantFiled: October 4, 1976Date of Patent: August 8, 1978Assignee: Union Carbide CorporationInventors: Clifford W. Hill, Donald W. Carkhuff, Frank J. Pilia
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Patent number: D359058Type: GrantFiled: December 2, 1993Date of Patent: June 6, 1995Assignee: The Esab Group, Inc.Inventor: Donald W. Carkhuff
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Patent number: D362860Type: GrantFiled: December 2, 1993Date of Patent: October 3, 1995Assignee: The Esab Group, Inc.Inventor: Donald W. Carkhuff
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Patent number: D365345Type: GrantFiled: May 27, 1994Date of Patent: December 19, 1995Assignee: ESAB Welding Products, Inc.Inventor: Donald W. Carkhuff
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Patent number: D379577Type: GrantFiled: September 6, 1995Date of Patent: June 3, 1997Assignee: The ESAB Group, Inc.Inventor: Donald W. Carkhuff