Patents Represented by Law Firm Dugger, Johnson & Westman
  • Patent number: 3961151
    Abstract: A heater construction for inductively heated rotating rolls which have inductive heater coils made up of a large number of turns of wire. The heater wire used for winding the coil has a high temperature insulation, preferably an inorganic material such as glass fiber, which may be impregnated with silicone in order to prevent abrasion as it is being wound. As each layer of wire is wound into coil form a coating of ceramic paste or ceramic material is applied to fill the interstitial spaces between the wires to provide a coil construction that has no voids within it that would permit relative movement between the wires to the extent that they could abrade and short out against each other.
    Type: Grant
    Filed: June 3, 1974
    Date of Patent: June 1, 1976
    Assignee: Rosemount Inc.
    Inventor: Kenneth H. Danner
  • Patent number: 3953721
    Abstract: An analogue computer has two or more multiplication modules. Each module provides an output signal representing the product of the magnitude of an analogue input signal to the module and the factor represented by a common multiplier signal controlling the module. Output signals of two or more modules are combined to provide a composite signal. A comparator compares the composite signal with a reference level and adjusts the common multiplier signal so as to maintain the composite signal substantially equal to the reference level. Modules are connected in chains with the output of one module connected to the input of the next module in the chain. Output signals from the various modules represent terms in the polynominal expressions of equations which the computer can solve. Potentiometers allow these output signals to be scaled in accordance with the constant coefficients of the terms.
    Type: Grant
    Filed: February 12, 1975
    Date of Patent: April 27, 1976
    Assignee: Rosemount Engineering Company Limited
    Inventors: James Stewart Johnston, Dennis George Cope
  • Patent number: 3952817
    Abstract: Basket type core retainer apparatus that includes a core receiving tube having an axially inner end, an annular drill bit or tubular extension connected to the inner end of the core receiving tube and a core retainer cooperatively mounted by the tube and the bit or tubular extension to permit passage of core into the tube and retain a core or a soil sample in the tube. The core retainer includes a mounting ring that mounts a pair of spring finger assemblies to extend axially outwardly thereof. The finger assemblies are each formed from a single sheet of material, the fingers of the assemblies in a closed (core retaining) position having each finger of one assembly in partial overlapping relationship to an adjacent finger of the other assembly and in partial underlapping relationship to an adjacent finger of said other assembly. The fingers are movable to permit passage of a core or a soil sample into the receiving tube.
    Type: Grant
    Filed: March 8, 1974
    Date of Patent: April 27, 1976
    Assignee: Longyear Company
    Inventor: John Forrest Anderson
  • Patent number: 3942218
    Abstract: A scrubbing machine that includes an articulated vehicle having a power unit and a trailer unit coupled thereto, said trailer unit having cleaning and dirty solution tanks thereon, a squeegee assembly on the power unit having a central liquid take-up tube and a second take-up tube at one end portion thereof, controls operated by turning the vehicle in the appropriate direction for switching the application of vacuum from the central tube to the second tube, a scrubber head unit and an assembly for mounting and carrying the scrubber unit on the vehicle and raising and lowering the scrubber unit including an articulated joint to permit limited pivotal movement of the scrubber head about a generally vertical axis and an axis perpendicular thereto.
    Type: Grant
    Filed: June 19, 1974
    Date of Patent: March 9, 1976
    Assignee: Tennant Company
    Inventors: Keith N. Krier, Neil F. Brown, Steven J. A. Waldhauser
  • Patent number: 3942236
    Abstract: A continuous motion assembly machine for assembling parts which require rotary assembly motion such as putting together two threadably assembled parts. The machine includes a plurality of assembly devices mounted on a rotating support which are operated as they rotate to pick up a first part, and to provide inspection of the parts, which in the form shown is the presence or absence, proper position and proper fit of parts, and assemble the parts and reject any parts that are improperly assembled, remove the good parts, and repeat the cycle. The assembly is carried out with rotary assembly motion between the two parts and which rotary motion can be controlled at a desired torque level for insuring proper assembly and operation of the parts.
    Type: Grant
    Filed: December 16, 1974
    Date of Patent: March 9, 1976
    Assignee: Inventors Engineering, Inc.
    Inventor: James W. Elmer
  • Patent number: 3942452
    Abstract: A ski lift is provided having cars riding in a track up the slope by means of a rope trained about two wheels at opposite ends of the slope. The cars are manually engaged with the rope but are so designed that they may not be manually disengaged from the rope during their upward travel.
    Type: Grant
    Filed: May 8, 1974
    Date of Patent: March 9, 1976
    Assignee: Alpine Valley Resort, Inc.
    Inventor: Truman C. Peck
  • Patent number: 3940975
    Abstract: A support for use with diametral and other types of extensometers to support the weight of the extensometer and also permit the extensometer to move with the specimen in its translational axes without substantial restraint, that is, up, down and in all directions sideways. At the same time the support provides restraint or stiffness in all three axes of rotation of the extensometer.
    Type: Grant
    Filed: September 9, 1974
    Date of Patent: March 2, 1976
    Assignee: MTS Systems Corporation
    Inventor: Harry R. Meline
  • Patent number: 3939557
    Abstract: A resistance thermometer sensor is provided by forming a path of electrically conducting material secured on an insulating base. The path is shaped as a loop having two side-by-side portions. A shorting bar connecting across these portions to short circuit part of the loop is adjusted along their length to trim the ice point resistance of the sensor as required. When suitably adjusted, the shorting bar is fastened in position, for example by welding. In one example, the sensor comprises a bifilar helix of resistance wire wound and secured on a cylindrical former.
    Type: Grant
    Filed: January 9, 1975
    Date of Patent: February 24, 1976
    Assignee: Rosemount Engineering Company Limited
    Inventor: Kenneth George Rendle
  • Patent number: 3938212
    Abstract: A scrubbing machine that includes an articulated vehicle having a power unit and a trailer unit coupled thereto, said trailer unit having cleaning and dirty solution tanks thereon, a squeegee assembly on the power unit having a central liquid take-up tube and a second take-up tube at one end portion thereof, controls operated by turning the vehicle in the appropriate direction for switching the application of vacuum from the central tube to the second tube, a scrubber head unit and an assembly for mounting and carrying the scrubber unit on the vehicle and raising and lowering the scrubber unit including an articulated joint to permit limited pivotal movement of the scrubber head about a generally vertical axis and an axis perpendicular thereto.
    Type: Grant
    Filed: July 19, 1974
    Date of Patent: February 17, 1976
    Assignee: Tennant Company
    Inventors: Keith N. Krier, Neil F. Brown, Steven J. A. Waldhauser
  • Patent number: 3937493
    Abstract: Labels for file folders that each has a self-adhesive backed surface and in a non-folded position has a front surface with a given letter of the alphabet printed on one half and the same letter of the alphabet printed on the other half at right angles to the first mentioned letter for permitting the label to be used either for top tab filing or end tab filing. In either case, with the label properly positioned on the file folder, and the file properly placed in a vertical position in a file cabinet, one letter will be upright on the desired side of the tab to which the label is adhered. Thirteen distinctive colors are keyed to the first 13 letters of the alphabet as a solid block, and the same 13 colors are used for the second half of the alphabet with strips (bands) through the colored portions of the labels.
    Type: Grant
    Filed: September 30, 1974
    Date of Patent: February 10, 1976
    Assignee: The Smead Manufacturing Company
    Inventor: David J. Fasbender
  • Patent number: 3936043
    Abstract: A case magazine and case stripper part of a case opening, loader sealer machine, including longitudinal case slide rails for supporting a vertical stack of unopened, horizontal, flat folded cases, lug devices mounted on a carriage that is longitudinally reciprocated by an endless chain drive to remove the lowermost case from the stack and push the lowermost case forwardly along the slide rails as the carriage moves forwardly, vertical stack support magazine brackets locates adjacent the corners of the stack extending upwardly from adjacent the elevation of the slide rails, and being mounted to be selectively adjustably positioned longitudinally and transverse relative one another, vacuum cup assemblies on opposite transverse sides of the slide rails for pivoting transversely opposite lowermost flaps about fold lines to a given angle of inclination and then release the flaps, spring hold down mechanism for retaining the flaps at said angle while permitting the flaps to be translated forwardly and control mecha
    Type: Grant
    Filed: July 26, 1974
    Date of Patent: February 3, 1976
    Assignee: Bemis Company, Inc.
    Inventors: Gaylerd Lieder, Philip G. Rawlins
  • Patent number: 3933255
    Abstract: A case magazine and case stripper part of a case opening, loader sealer machine, including longitudinal case slide rails for supporting a vertical stack of unopened, horizontal, flat folded cases, pusher assemblies mounted on a carriage that is longitudinally reciprocated by an endless chain drive to remove the lowermost case from the stack and push the lowermost case forwardly along the slide rails as the carriage moves forwardly, vertical stack support brackets located adjacent the corners of the stack extending upwardly from adjacent the elevation of the slide rails, and being mounted to be selectively adjustably positioned longitudinally and transverse relative one another, and case lifter assemblies mounted on the stack support brackets for elevating that part of the stack that is located vertically above the slide rails more than a preselected distance, automatically allowing the elevated part of the stack to bear against that part of the stack still supported by the slide rails, and thereafter elevate
    Type: Grant
    Filed: December 6, 1973
    Date of Patent: January 20, 1976
    Assignee: Bemis Company, Inc.
    Inventors: Gaylerd M. Lieder, Harold K. Fox
  • Patent number: 3930679
    Abstract: Wire line core barrel apparatus that includes a wire line core barrel inner tube assembly movable through a drill stem to be seated in a latched core taking position adjacent the drill stem core bit, and a main overshot assembly that is coupled to a lowering overshot assembly for lowering the inner tube assembly and alternately coupled to a retracting overshot assembly for withdrawing the inner tube assembly. The inner tube assembly includes a generally annular overshot coupling member secured to a latch release tube that is mounted on a latch body to retract a pair of latches when said tube is moved axially outwardly relative the latch body, and an overshot coupling rod secured to the latch body and extended through the coupling member. The lowering overshot assembly has a lock coupling for releasably couplingly engaging the coupling rod that upon pulling on the lowering assembly with more than a given force will release coupling engagement of the lowering with the coupling rod.
    Type: Grant
    Filed: April 11, 1974
    Date of Patent: January 6, 1976
    Assignee: Longyear Company
    Inventors: Ronald B. Anderson, Walter W. Svendsen