Patents Represented by Attorney Thomas B. Lindgren
  • Patent number: 6158267
    Abstract: An apparatus and method for modeling dynamic effects on a gyroscope. The dynamic effects are represented by a dynamic effects function. The gyroscope is placed in an oven. A test controller, coupled to the oven, controls the oven to modify the temperature of the gyroscope according to a predetermined temperature function, measures an actual temperature value of the test oven and a gyroscope drift value at predetermined time intervals during the predetermined temperature function, and calculates coefficients of the dynamic effects function as a function of the actual temperature and gyroscope drift values at the predetermined time intervals.
    Type: Grant
    Filed: March 5, 1997
    Date of Patent: December 12, 2000
    Assignee: Caterpillar Inc.
    Inventor: Zhejun Fan
  • Patent number: 5046710
    Abstract: A method and apparatus are disclosed for making a leaflet having fold lines and cross folds normal to the fold lines and with an adhesive adhering a lip portion of a long leg of the leaflet to a short leg of the leaflet to avoid leaving a loose edge on the leaflet. Sheets are conveyed in a first direction to a first folding at a first folding station, and then a second conveyor feeds the sheets to travel at right angles to a cross folder at a second folding station. The cross folds are made to a lip portion on a long leg and adhesive applicator applies adhesive to the lip portion which is adhered by the adhesive to a folded panel to form a leaflet having fold lines and cross folds at its edges, thereby eliminating any loose edges. Loose edges may open the leaflet during a high speed conveyance thereof.
    Type: Grant
    Filed: March 23, 1989
    Date of Patent: September 10, 1991
    Assignee: Vijuk Equipment, Inc.
    Inventor: Robert Vijuk
  • Patent number: 5044873
    Abstract: Apparatus is disclosed for folding sheets and for slitting the folded sheets to form adjacent parallel rows or streams of folded sheets being conveyed by belts into a stacking station. A jogger located adjacent the conveyor belts may jog folded sheets laterally to indicate a predetermined count of sheets in a column. The folded sheets in each column are fed by the belts upward against stops. A generally horizontal support holds a container to receive parallel streams of on-edge vertical folded sheets each of which is pushed into the container while on-edge and vertical by a succeeding folded sheet. The container is removed having parallel rows of on-edge, vertically positioned, folded sheets stacked therein.
    Type: Grant
    Filed: March 7, 1989
    Date of Patent: September 3, 1991
    Inventor: Michael Vijuk
  • Patent number: 5001315
    Abstract: A circuit breaker auxiliary device is housed in its own separate enclosed container and is accessible by a drive pin through an opening in the container mounting surface. A drive pin is inserted into an opening in a circuit breaker housing mounting surface. The container is snap-fitted flushly to a side of the circuit breaker housing. The internal trip mechanism of the circuit breaker and the operative mechanism of the auxiliary device communicate via the drive pin cooperatively linked to each mechanism and operating through the aligned openings in the container and the circuit breaker housing.
    Type: Grant
    Filed: July 8, 1988
    Date of Patent: March 19, 1991
    Assignee: Square D Company
    Inventors: Daniel Runyan, Gary J. Irons, Thomas A. Edds
  • Patent number: 4916419
    Abstract: A circuit breaker having a movable upper blade with a free floating pivot end. The operating mechanism is solidly connected to the upper blade. The contact force is generated by a contact spring which exerts an upward force on the lower blade. No other resilient force acts directly upon the upper blade. As the contacts separate, the force exerted on the upper blade is virtually eliminated, reducing substantially the resistance at the pivot end of the upper blade. The load terminal and pivot end of the upper blade provide a current path parallel to that of the load side flexible connector.
    Type: Grant
    Filed: December 9, 1988
    Date of Patent: April 10, 1990
    Assignee: Square D Company
    Inventor: John M. Winter
  • Patent number: 4912441
    Abstract: A circuit breaker consisting of a housing having a fixed contact and a movable contact mounted on a blade which in turn is pivotally supported on a blade carrier that is pivoted within the housing and a handle that cooperates with the blade carrier to pivot the carrier between positions. A trip lever is pivotally mounted in the housing and has biasing means interposed between the blade and the trip lever to pivot the blade between respective positions with latch means holding the trip lever in a position where the blade and blade carrier are biased to close the contacts. The handle and carrier have cooperating camming surfaces that magnify the forces applied to the handle for pivotal movement of the carrier.
    Type: Grant
    Filed: June 27, 1988
    Date of Patent: March 27, 1990
    Assignee: Square D Company
    Inventors: Daniel Runyan, Thomas A. Edds
  • Patent number: 4906958
    Abstract: A multi-pole circuit breaker apparatus includes first and second circuit breakers having first and second handles extending therefrom for switching the circuit breakers between "On" and "Off" positions. The circuit breakers are connected together with the handles extending generally parallel to each other. A handle tie connects the first and second handles for simultaneous operation. The handle tie has first and second handle openings disposed therethrough. The first and second handles extend all the way through the first and second handle openings, respectively, so that a forwardmost extension of the combined handles and handle tie is no greater than a forwardmost extension of the handles in the absence of the handle tie. The handle tie is slidably received about the handles so that it is free to float along at least a portion of a length of the handles.
    Type: Grant
    Filed: November 2, 1988
    Date of Patent: March 6, 1990
    Assignee: Square D Company
    Inventor: Wayne G. Adamson
  • Patent number: 4906967
    Abstract: An electronic circuit breaker having withstand capability. When the fault current exceeds the required withstand level, the mechanism force trips the circuit breaker. The forces generated by a blow-on contact loop are exerted on the various components of the operating mechanism, including the quick trip latch and secondary latch. As the fault current exceeds the required withstand level, the forces on the operating mechanism exceed the spring force holding together the quick trip latch and secondary latch. These two components rotate as one assembly during a trip operation initiated by energizing the trip coil. In the force trip operation, these two components separate unlatching the mechanism and opening the circuit breaker contacts.
    Type: Grant
    Filed: September 26, 1988
    Date of Patent: March 6, 1990
    Assignee: Square D Company
    Inventor: John M. Winter
  • Patent number: 4901219
    Abstract: A plug-in power supply includes a housing dimensioned to fit into a space designed to accept a circuit breaker in a load center to provide D.C. power from an A.C. main power. The housing encloses a circuit card that has components that are connected between A.C. inlet terminals and D.C. output terminals to provide a peak current for a short duration, limit the output to a D.C. voltage maximum, and interrupt the output current when the output voltage drops below a certain level.
    Type: Grant
    Filed: December 22, 1987
    Date of Patent: February 13, 1990
    Assignee: Square D Company
    Inventors: Kenneth W. Erickson, Henry J. Zylstra
  • Patent number: 4897756
    Abstract: An add on ground fault detection system including a module readily connected to the distribution line and to the associated circuit breaker, and including circuit means for sensing a metering signal while providing a low resistance burden to summing transformers, and providing a relay tripping signal if the metering signal is above a selected level.
    Type: Grant
    Filed: February 22, 1989
    Date of Patent: January 30, 1990
    Assignee: Square D Company
    Inventor: Henry J. Zylstra
  • Patent number: 4882459
    Abstract: A pressure sensitive switch has means for producing linear motion in response to pressure, means for springably resisting the linear motion, means for operating a switch after a predetermined linear motion, and a lifter pin having a projection on a first end for slidably engaging a hole in the means for springably resisting the linear motion, the lifter pin being mounted between the means for producing linear motion and the means for springably resisting the linear motion so as to transmit force from the means for producing linear motion to the means for springably resisting the linear motion, the lifter pin decoupling rotational motion between the means for producing linear motion and the means for springably resisting the linear motion. A piston may serve as the means for producing linear motion in response to pressure.
    Type: Grant
    Filed: December 9, 1988
    Date of Patent: November 21, 1989
    Assignee: Square D Company
    Inventors: Stanley H. Edwards, Jr., Simon S. Smith, Jr., James B. Warren
  • Patent number: 4866216
    Abstract: A busbar corner housing includes outer and inner side walls secured to one another through flanges spaced from the corner bend. This leaves opposed openings that are substantially closed by plate-like corner covers. Each corner cover has a channel that conforms to the configuration of the outer and inner side walls and engages and abuts against the side walls. Each corner cover also includes a passage through which silicone caulking material can be forced to fill the spaces under the corner covers with caulking material, with excess caulking material being extruded out of sliver gaps between the corner covers and side walls to fill the sliver gaps and seal the housing against intrusion of moisture.
    Type: Grant
    Filed: February 26, 1988
    Date of Patent: September 12, 1989
    Assignee: Square D Company
    Inventor: Allen E. Slicer
  • Patent number: 4862131
    Abstract: A circuit breaker for breaking current conduction between line and load connectors in response to tripping of a bimetallic thermal element as a result of an over-current condition is disclosed. According to the invention, a trip crossbar is permitted to translate as well as rotate to relieve stress on the thermal element.
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: August 29, 1989
    Assignee: Square D Company
    Inventors: Clark L. Oster, Paul Rustebakke, Daniel R. Schiefen
  • Patent number: 4858053
    Abstract: A motor controller is adaptable to a wide range of motor currents by using an integrator circuit having an additional feedback arrangement for affecting the effective time constant of the integrator under specified conditions. The operational amplifier has an amplifier having a first input, a second input, and an output, an input resistor connected between an input of the operational amplifier and the first input of the amplifier, and a feedback impedance connected between the output of the amplifier and the first input of the amplifier. A voltage at the input of the operational amplifier is compared with a voltage at the first input of the amplifier. An auxiliary current path for the feedback impedance is provided when the voltage at the input of the operational amplifier has a predetermined relationship to the voltage at the input of the amplifier.
    Type: Grant
    Filed: August 4, 1987
    Date of Patent: August 15, 1989
    Assignee: Square D Company
    Inventor: Mark V. Profio
  • Patent number: 4849589
    Abstract: Apparatus for simultaneously applying two independent forces to the contact blades of a movable contact assembly. The contact assembly has three contact blades joined at the base. The circuit breaker mechanism exerts a closing force through a blade carrier to the center blade which in turn exerts a closing force on the outer main blades. To increase the contact force on the outside main blade contacts without increasing the contact force of the center blade contact and without changing the relative distances between the blade carrier and the main blade contacts and center blade contacts, a compression spring is positioned between each main blade and the blade carrier.
    Type: Grant
    Filed: October 26, 1988
    Date of Patent: July 18, 1989
    Assignee: Square D Company
    Inventors: James W. Dickens, Clark L. Oster
  • Patent number: 4787011
    Abstract: A control center utilizing individual control units that hang from a unit shelf in a control center section. A tongue on the top of each control unit mates with the groove of the unit shelf to provide quick and easy alignment for electrical connections between the control unit and the vertical bus bar. The unit shelf and door are designed to be secured simultaneously to the cabinet.
    Type: Grant
    Filed: August 20, 1986
    Date of Patent: November 22, 1988
    Assignee: Square D Company
    Inventors: Harold W. Stanfield, Richard A. VonRotz
  • Patent number: 4757167
    Abstract: A circuit breaker having a contact assembly with a double pivot arrangement. The moving arcing and main contacts provide a smooth surface for meeting the lower arcing contact and the lower main contacts, each mounted on a separate semi-stationary lower blade. The lower arcing contact is positioned higher than the lower main contact, making the arcing contact the last to separate from the moving contact. An arc horn is mounted adjacent the moving contacts to provide a path for movement of the arc from the upper contact into the arc stack assembly. The arc horn has three fingers, each of which passes through the cutaway portion of each arc plate of the arc stack assembly upon the contacts separating.
    Type: Grant
    Filed: October 24, 1986
    Date of Patent: July 12, 1988
    Assignee: Square D Company
    Inventors: Aymon A. Maulandi, Kevin J. Green, Gary A. Volesky
  • Patent number: 4740864
    Abstract: A slidable splice plate assembly for physically and electrically connecting the horizontal bus bars of adjacent sections of control centers. The electrically connecting splice bars and the insulating splice slide plate are preassembled and connected to a single horizontal bus within a control center section bar for shipment. After two adjacent sections of control center have been placed side by side, the splice plate assembly of the first control center section is moved over to overlap and be physically connected to the horizontal bus bar of the adjacent control center section.
    Type: Grant
    Filed: August 20, 1986
    Date of Patent: April 26, 1988
    Assignee: Square D Company
    Inventors: Harold W. Stanfield, Richard A. Von Rotz
  • Patent number: 4737606
    Abstract: A circuit breaker having an arc stack assembly that provides a longer arcing path resulting in decreased restriking characteristics during an interrupt cycle. The arc stack assembly has approximately parallel metal arc plates mounted in insulating sides. At the top of the arc stack assembly is an upper runner with a tail curving downwards to end near the uppermost arc plate. The arc horn has a prong that moves through the arc stack assembly and also through a groove in the upper runner. The tolerance between the arc and the upper runner is very close to facilitate transfer of the arc to the upper runner.
    Type: Grant
    Filed: October 24, 1986
    Date of Patent: April 12, 1988
    Assignee: Square D Company
    Inventor: John M. Winter
  • Patent number: D298104
    Type: Grant
    Filed: April 19, 1985
    Date of Patent: October 18, 1988
    Assignee: Square D Company
    Inventor: Eldred R. Harmon