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...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
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| Number | Title | Issue Date |
| 7105773 | Electric arc welder An electric arc welder for depositing weld metal along a groove between two edges of a metal workpiece where the welder comprises a first electrode driven by a first wire feeder toward a point in said groove, a second electrode driven by a second wire feeder toward ... | 09/12/2006 |
| 6933458 | Method for positioning a welding bolt and bolt welding head The invention relates to a method for positioning a welding bolt (15), held in a bolt welding head (3), whereby the robot (5), to which the bolt welding head (3) is fixed, moves the bolt welding head sideways until a touch sensor (21 | 08/23/2005 |
| 6914210 | Method of repairing a stationary shroud of a gas turbine engine using plasma transferred arc welding A stationary shroud of a gas turbine engine made of a base metal is repaired by removing any damaged material from a flow-path region of the stationary shroud to leave an initially exposed base-metal flow-path surface; and applying a base-metal restoration overlying... | 07/05/2005 |
| 6909067 | Method and apparatus for welding with CV control A method and apparatus for welding is disclosed. The output is preferably a cyclical CV MIG output, and each cycle is divided into segments. An output parameter is sampled a plurality of times within one or more of the segments. The CV output is controlled within th... | 06/21/2005 |
| 6903300 | Method for thermally working a workpiece, thermal working machine therefor, and cutting or welding tool suited for use in the working machine A thermal working tool (1) is movable along a workpiece surface (7) and includes a torch head (2) which has exchangeably mounted thereon cutting or welding tools (3; 4; 5) extending between the torch head (2) and the workpiece surf... | 06/07/2005 |
| 6335511 | Control method and apparatus for an arc welding system An arc welding control method and apparatus includes a voltage control loop in which a pulsation parameter such as pulse width, pulse amplitude, background amplitude between pulses, or frequency, is adjusted to compensate for deviations in the arc voltage... | 01/01/2002 |
| 5756966 | Method for joining metal components with improved arc voltage sensing and control A method of arc voltage sensing and electrode position control during mechanized electric arc welding. This welding method utilizes a lower power mode of the arc which has an improved voltage sensing geometry, and allows welds to be reliably made between ... | 05/26/1998 |
| 5607603 | Process and apparatus for eliminating casting defects on the surface of a cast iron body Cast-iron bodies are repaired or surface defects corrected by chambering the cast-iron body in the region of the defect and positioning the body with the resulting recess upwardly opening beneath a crane from which the head of an electrode advancing unit ... | 03/04/1997 |
| 5545873 | Variable control of weld torch parameters A weld apparatus comprises a compound slide for moving a welding torch relative to a substrate to be welded so as to traverse a surface of the substrate. A control system disposed on the slide and comprises a control slide rail disposed on the slide for m... | 08/13/1996 |
| 5326955 | Standoff control method and apparatus for plasma cutting machine The present invention discloses a standoff control method and an apparatus for a plasma cutting machine capable of quickly correcting a deviation of the standoff with respect to a set value, keeping constant the standoff even if the cutting speed changes,... | 07/05/1994 |
| 5107090 | Welding head A clamp intended for the end-to-end welding of two tubes disposed in accordance with an axis (3) by an electrode (14) operating in a circular movement (18) includes two collars (1, 2), mounted pivotably around the axis (3), put into rotation by gears (7, ... | 04/21/1992 |
| 4897521 | Weld arc simulator An arc voltage simulator for an arc welder permits the welder response to a variation in arc voltage to be standardized. The simulator uses a linear potentiometer connected to the electrode to provide a simulated arc voltage at the electrode that changes ... | 01/30/1990 |
| 4841118 | Orbital weld head tool An orbital weld head tool (10) has an orbiting and reciprocating carriage (22) for movement around a mandrel (12) fixed to a workpiece. Reciprocation is by a ball nut and screw drive means (70,74) driven by an arc voltage controlled motor (64). Rotation o... | 06/20/1989 |
| 4788408 | Arc device with adjustable cathode An arc plasma generating system includes components for adjusting spacing between the cathode and the anode. A piston affixed to the cathode is slidingly positioned in a cylinder partitioning therein a first chamber and a second chamber. The first chamber... | 11/29/1988 |
| 4780591 | Plasma gun with adjustable cathode A plasma generating system comprises a plasma gun including a hollow cylindrical anode member, a hollow cylindrical intermediate member electrically isolated from and juxtaposed coaxially with the anode member to form a plasma-forming gas passage through ... | 10/25/1988 |
| 4773946 | Device for controlling operating gap of cutting head and method of using same There is provided a device for controlling the vertical operating gap between the lower end of a cutting head, such as a frame cutting torch, and a generally flat workpiece positioned below the cutting head as the head and workpiece are moved relative to ... | 09/27/1988 |
| 4677275 | Method and sensor arrangement for tool/workpiece spacing control in electric arc processing machines In a processing machine which operates with an arc, for example, a burning cutting installation, the arc current is measured and regulating signals are derived from the measurement value for the purposes of regulating the tool-workpiece spacing. In that p... | 06/30/1987 |
| 4650957 | Voltage control system The voltage between a work instrument and a workpiece varies with the distance between them. A microcoded controller is used to compare the voltage between the work instrument and the workpiece when the instrument moves relative to the workpiece, to gener... | 03/17/1987 |
| 4631385 | Automated position detectors and welding system utilizing same A system and method for detecting the position of the welding torch with respect to the workpiece by varying the electrical power to the arc, measuring the effect of such variation on the arc current and/or arc voltage and processing the detected effect t... | 12/23/1986 |
| 4629853 | Apparatus for the internal welding of pipes An apparatus is disclosed for the internal welding of an edge joint between a large main pipe and a small branch pipe, which pipes together form a pipe branch. The apparatus is equipped with a nozzle holder for a non-consumable electrode which forms an ac... | 12/16/1986 |
| 4538046 | Precise positioning for a welding electrode which follows a three dimensional weld path A welding apparatus which includes a welding electrode and a filler wire assembly. The welding electrode and the filler wire assembly are fixed together and are to move along a weld path on a workpiece. The weld path may either take a regular or an irregu... | 08/27/1985 |
| 4507541 | Measuring proximity of metal to an arc welding torch Apparatus for measuring the distance between an electric welding torch and a workpiece especially useful with an aluminum workpiece. A nonconsumable electrode is mounted adjacent the consumable electrode of the welding torch with the nonconsumable electro... | 03/26/1985 |
| 4458190 | Electric discharge machining control device In an electric discharge machine in which the machining gap between an electrode and a workpiece is maintained suitably by a control device having sampling, logic operation and holding functions, an up-down counter is provided for integration, over a pred... | 07/03/1984 |
| 4449030 | Apparatus for sensing the distance between an object of electrically conductive material and a reference point An apparatus for sensing the distance between an object of electrically conductive material and a reference point has an electrode, the tip of which constitutes the reference point. The electrode is connected via a supply line to a high voltage source ada... | 05/15/1984 |
| 4441009 | Arc voltage control circuit for welding apparatus An improved control circuit is disclosed for controlling the arc voltage of welding apparatus. The circuit includes an automatic servo control circuit operative to gradually start the electrode positioning motor in the presence of an error signal indicati... | 04/03/1984 |
| 4441011 | Rotary arc-welding method A welding method comprises rotating a nozzle (3) provided with a welding electrode (9) eccentrically from the center axial line (a) thereof within a groove (2). The center axial line (a) of the nozzle is aligned with the center of the groove (2) by smooth... | 04/03/1984 |
| 4434352 | Arc welding method for automatically reversing a welding torch in the width direction of the groove at a set position In an automatic arc-welding method, which comprises: continuously moving a carriage along the longitudinal direction of a groove formed between the objects of welding; reciprocally moving in the width direction of the groove a welding electrode directed s... | 02/28/1984 |
| 4363468 | Cutting torch height control apparatus An apparatus (10) for controlling the height of one or more cutting torches (12) above a workpiece (14). The apparatus (10) senses the actual height of the torch (12) above the workpiece (14) and compares the actual height with a desired reference height.... | 12/14/1982 |
| 4350869 | Method of automatically welding with a non-consumable electrode A method for maintaining a constant arc gap between the electrode and the weld puddle by controlling the addition of filler wire based on the arc voltage.... | 09/21/1982 |
| 4336441 | Welding process A welding method for welding a base metal with a welding wire of specified alloy composition using a TIG welding process, automatically controlling an arc length between a nonconsumable electrode and the base metal, deflecting the arc forward in the weldi... | 06/22/1982 |
| 4170727 | Thermal torch height acquisition circuit A plasma torch circuit includes a control for initially setting the torch at a desired height above a workpiece during the time the non-transferred arc exists between the torch cathode and the torch tip. Measurement is made of the voltage between the cath... | 10/09/1979 |
| 4101754 | Adjusting circuit for use in plasma arc cutting torch An electrical height control circuit for controlling the height of a plasma arc cutting torch includes a differential amplifier which compares a torch height detector voltage with an adjustable reference voltage for setting the torch height. In accordance... | 07/18/1978 |
| 4008384 | Welding apparatus A system for supporting, guiding and controlling a welding head to maintain the welding head normal to the instantaneous surface contour of overlapping, convoluted metal sheets to weld the same together. The system is capable of being supported on the con... | 02/15/1977 |
| 3989921 | Method and apparatus for non-consumable electrode type automatic arc welding A method and an apparatus for non-consumable electrode type automatic arc welding in which the length of an arc produced between a non-consumable electrode and a workpiece which is being welded, is automatically controlled to an optimum value by means of ... | 11/02/1976 |
| 3975616 | Control circuit for automatic electric arc-welder An electrode feed motor control circuit for an automatic electric arc welder which gives improved starting. For cold starts, the electrode feed motor is instantaneously braked when the electrode first contacts the workpiece so that the electrode is lightl... | 08/17/1976 |
