Patents Assigned to Lenco, Inc.
  • Patent number: 4931018
    Abstract: A device for training, evaluating and providing practice for welders and particularly welders and welder students that use MIG, TIG and welding devices that employ movable consumable welding rods. The device includes a video monitor having a cathode ray tube, the face of which has visual displays thereon, including displays from which simulated welding parameters can be entered and displays which simulate different welding joints with a welding target to be followed by the operator while holding the selected welding tool. The present device uses a microprocessor and related electronic devices programmed to generate the displays and to control the various machine operations. The device also includes a unique way to produce the various control responses necessary to the operation including optical and electromagnetic responses.
    Type: Grant
    Filed: December 21, 1987
    Date of Patent: June 5, 1990
    Assignee: Lenco, Inc.
    Inventors: Donald J. Herbst, Richard D. Fay, David L. Frericks, Bruce A. Blair
  • Patent number: 4553013
    Abstract: A gas seal for a MIG gun system for preventing the leakage of shielding gas out the rear end thereof which includes a connector assembly, which seal is embodied in an elongated tubular member which has an outside diameter sized to be positioned extending into a bore extending through the connector assembly of the MIG gun welding system. The tubular member has flange means on one end including an outwardly extending annular flange which has a surface adapted when installed to be in surface-to-surface contact with the connector assembly adjacent the bore therethrough to form a seal therebetween, and an inwardly extending flange defining an opening of a size to permit welding wire to move therethrough. The inwardly extending flange and the adjacent portion of the tubular member form a cavity on the upstream side of the inwardly extending flange. A resilient member is positioned in the cavity upstream of the opening defined by the inwardly extending flange.
    Type: Grant
    Filed: August 8, 1984
    Date of Patent: November 12, 1985
    Assignee: Lenco, Inc.
    Inventor: William H. Colman
  • Patent number: 4543538
    Abstract: An amplifier circuit having first, second and third inputs and first and second input impedance elements connected respectively to the first and second inputs, a first differential stage connected between the first and second input impedance elements, first and second output stages connected to the differential stage outputs, the first and second output stages produce complementary voltage output signals on respective first and second outputs, first and second cross-coupled differential feedback loops linking the first output to the second input of the first differential stage and the second output to the first input of the first differential stage, the first and second outputs are linked to each other by a voltage divider circuit the midpoint of which is connected to one input of a second differential stage, the third input being the other input of the second differential stage, the output of the second differential amplifier causing a change in a current repeater circuit which in turn causes a change in the
    Type: Grant
    Filed: July 16, 1984
    Date of Patent: September 24, 1985
    Assignee: Lenco, Inc.
    Inventor: Richard D. Fay
  • Patent number: 4403136
    Abstract: A welding gun handle assembly connectable to a supply cable supplying a consumable welding electrode, shielding gas and electrical power, all under the control of a trigger operated switch in the handle assembly including a relocatable thumb rest which may be attached on either side of the handle assembly above the trigger of the switch so that the trigger may be operated in a natural manner by both right and left handed operators, a grip portion having finger grooves for placing at least one finger over the trigger of the switch, cooling vents through the handle assembly to permit circulation of cooling air therethrough, connection apparatus for connecting the welding gun to the supply cable, a gooseneck assembly and an adapter on the handle for connection therewith and a replaceable liner for guiding the consumable welding electrode from the connection apparatus to the welding gun, through the removable gooseneck.
    Type: Grant
    Filed: March 17, 1981
    Date of Patent: September 6, 1983
    Assignee: Lenco, Inc.
    Inventor: William H. Colman
  • Patent number: 4388637
    Abstract: A device and method for monitoring a video signal formed by a train of horizontal sync pulses including odd and even numbered sync pulses and intermittent color burst signal portions located between successive horizontal sync pulses including a circuit for generating a first continuous signal in phase with the color burst signal portions, a circuit for generating a second continuous signal in phase with the odd numbered horizontal sync pulses, a demodulator circuit for demodulating the first signal with the second signal to produce a third signal, and a display device for displaying a vertical line and the third signal as a sine wave with the phase of the sine wave with respect to the vertical line being representative of the color burst signal portion to horizontal sync pulse phasing of the video signal.
    Type: Grant
    Filed: June 8, 1981
    Date of Patent: June 14, 1983
    Assignee: Lenco, Inc.
    Inventor: Bruce A. Blair
  • Patent number: 4286755
    Abstract: A valve for use on a sandblasting device to control the flow of an abrasive media expelled under pressure including a tubular housing having first and second end portions and a passageway extending therebetween, the housing having a transverse opening therethrough at an intermediate location therealong intersecting the passageway, a connecting member associated with the first end portion for attaching the housing to a sandblasting device, a nozzle guard assembly having a connection associated therewith for cooperatively engaging with the second housing end portion, the nozzle guard assembly having a passageway therethrough, a nozzle element positioned in the passageway in the guard assembly communicating with the passageway in the housing structure for controlling the flow therethrough, a flexible conduit member positioned in the housing passageway and extending therein between the first and second end portions, and an operator assembly mounted on the housing structure for controlling the flow through the fle
    Type: Grant
    Filed: October 15, 1979
    Date of Patent: September 1, 1981
    Assignee: Lenco, Inc.
    Inventor: Ronald L. Shipman
  • Patent number: 4230929
    Abstract: A control circuit for accurately controlling the duration of a welding operation.
    Type: Grant
    Filed: January 12, 1978
    Date of Patent: October 28, 1980
    Assignee: Lenco, Inc.
    Inventors: Bruce A. Blair, Howard G. McClure
  • Patent number: 4124944
    Abstract: An apparatus for simulating an arc welding operation, for training welders and for evaluating a welder's performance including a target representing a simulated weld to be made, mechanism for imparting predetermined motion to the target, a simulated welding tool including a simulated welding rod and a holder for the rod, the rod having a free end with an element adjacent thereto having properties capable of being sensed magnetically, a magnetic sensor assembly located adjacent to the target for movement therewith and including members capable of responding to the presence of the magnetic field produced by the magnetic element on the rod for producing responses depending upon the position of the simulated welding rod relative thereto and the distance of the rod therefrom, the magnetic sensor assembly including angularly related pairs of opposed sensor members arranged to produce responses to represent the position of the simulated welding rod relative thereto in two different angularly related directions, each
    Type: Grant
    Filed: July 8, 1977
    Date of Patent: November 14, 1978
    Assignee: Lenco, Inc.
    Inventor: Bruce A. Blair