Patents Assigned to The Manitowoc Company, Inc.
  • Patent number: 4387813
    Abstract: A front and rear pair of crawler assemblies are provided for supporting the ring of a ring supported crane so the crane can travel under load. The front pair of crawler assemblies which form an independent transporter mechanism are selectively and reversely powered to facilitate forward and reverse as well as turning movement. The rear pair of crawler assemblies are disposed in idling arrangement.
    Type: Grant
    Filed: September 8, 1981
    Date of Patent: June 14, 1983
    Assignee: The Manitowoc Company, Inc.
    Inventors: Daniel E. Beduhn, James G. Morrow, Sr.
  • Patent number: 4382519
    Abstract: A traveling attachment including a pair of crawler assemblies and frame elements are provided for interconnection to the ring of a ring supported crane so the crane can travel under load. The crawler assemblies may be pivotally mounted and reversely powered to facilitate turning.
    Type: Grant
    Filed: September 25, 1981
    Date of Patent: May 10, 1983
    Assignee: The Manitowoc Company, Inc.
    Inventors: Daniel E. Beduhn, James G. Morrow, Sr.
  • Patent number: 4381060
    Abstract: A ring supported mobile lift crane includes a load carrier and a counterweight carrier in riding contact with the ring and a tower mounted on the carrier for pivotal movement between generally horizontal and vertical positions with a boom pivoted to the outer end of the tower and a rearwardly inclined mast mounted on said carrier and connected to the counterweight carrier by rigging a mast pendant, a tower backstay connected to the top of the tower and through tower hoist rigging to the top of the mast.
    Type: Grant
    Filed: July 9, 1980
    Date of Patent: April 26, 1983
    Assignee: The Manitowoc Company, Inc.
    Inventors: James G. Morrow, Sr., Michael C. Anderson
  • Patent number: 4380107
    Abstract: A device for handling connector pins, that is, for inseting and removing pins from alined holes in structural members, comprising a pair of frame plates notched to fit over the structural members and which are formed to receive the hydraulic jack and pump of a conventional tool so that extension of the jack moves the connector pin into or out of position. For insertion, the frame receives a pin in alinement with holes in the structural member, and for removal the frame includes a tray for receiving the pin when it is pushed free. In each case, extension of the jack causes pin movement. The center of gravity of the device, and a suspension member, is to the jack side of the notches so that the device can be manipulated at one side of the lower cord of a crane boom, for example. Jack piston extensions and pin handling tools are provided.
    Type: Grant
    Filed: February 15, 1978
    Date of Patent: April 19, 1983
    Assignee: The Manitowoc Company, Inc.
    Inventor: Dennis I. Andress
  • Patent number: 4358021
    Abstract: Front and rear pairs of crawler assemblies are provided for supporting separated ring segments disposed forwardly under the boom and rearwardly under the counterweight so the crane can travel under load and swing through at least a partial horizontal arc with separate pivots for the boom and counterweight. One and preferably both crawler assemblies are selectively and reversely powered to facilitate forward and reverse as well as turning movement during travel under loaded and unloaded conditions.
    Type: Grant
    Filed: March 7, 1980
    Date of Patent: November 9, 1982
    Assignee: The Manitowoc Company, Inc.
    Inventors: Percy R. Helm, James G. Morrow, Sr.
  • Patent number: 4342028
    Abstract: A drum rotation indicator for a power driven cable drum operated by a control lever, which includes an arbor rotatably mounted within the control lever and having an exposed end with a thimble-like recess. An electric motor rotates the arbor, and the motor is driven by a signal generator driven by the cable drum. A control circuit triggers operation of the motor in one direction or the other upon rotation of the generator in one direction or the other, and a tachometer driven by the motor limits the effect of the generator so that motor speed is held proportional to generator speed.
    Type: Grant
    Filed: November 25, 1980
    Date of Patent: July 27, 1982
    Assignee: The Manitowoc Company, Inc.
    Inventor: James C. Schroeder
  • Patent number: 4316548
    Abstract: Front and rear pairs of crawler assemblies are provided for supporting concentric ring segments disposed forwardly under the boom and rearwardly under the counterweight so the crane can travel under load and swing through at least a partial horizontal arc. One and preferably both crawler assemblies are selectively and reversely powered to facilitate forward and reverse as well as turning movement during travel under loaded and unloaded conditions.
    Type: Grant
    Filed: March 7, 1980
    Date of Patent: February 23, 1982
    Assignee: The Manitowoc Company, Inc.
    Inventors: Percy R. Helm, James G. Morrow, Sr.
  • Patent number: 4284265
    Abstract: Separate torque converters are selectively clutched to the hoist and drag drums of a dragline machine with a selectively engageable clutch providing a power interlock of the output of both torque converters to either one of the drums as desired. The application and control of torque from the two torque converters to the hoist drum is in parallel and to the drag drum is in series progressive, i.e., the drag converter being engaged first and going from zero to maximum while the hoist converter goes from zero to about fifty percent of capacity as the drag converter reaches maximum. The reserve torque in the hoist converter may be selectively applied to the hoist drum to step the drag bucket up if the drag drum approaches a stall condition. The hoist converter may also be selectively engaged to apply a predetermined hold back force during bucket lowering. Another clutch may be engaged to interlock the two drums together for joint operation by the hoist converter.
    Type: Grant
    Filed: December 3, 1979
    Date of Patent: August 18, 1981
    Assignee: The Manitowoc Company, Inc.
    Inventor: James G. Morrow, Sr.
  • Patent number: 4195740
    Abstract: A lift crane in which the upper works is mounted on a platform that rides on a large diameter ring which is fixed to a generally square, planar and rigid frame. The frame is rigidly secured directly to the cross members which interconnect the crawlers of a crawler-transporter, with the securement being releasable by pin connections to permit the ring and its frame to be removed from the crawler-transporter and used as a fixed crane mounting pad.
    Type: Grant
    Filed: April 24, 1978
    Date of Patent: April 1, 1980
    Assignee: The Manitowoc Company, Inc.
    Inventors: Daniel E. Beduhn, James G. Morrow, Sr.
  • Patent number: 4194638
    Abstract: A tower crane is carried on a platform rotatably mounted on a large ring with the tower pivotally mounted on the forward portion of the platform above the ring and a mast mounted on the platform adjacent the boom and extending upwardly and rearwardly therefrom. A counterweight support at the rear end of the platform also rides on the ring and is connected to the top of the mast by a backstay. At the top of the tower is a pivotally mounted, forwardly projecting boom and an upwardly and rearwardly inclined boom strut whose upper end is pin-connected to the top of the mast by a backstay strut. A tower backstay is connected to an upper part of the tower and extends generally horizontally rearwardly to the top of the mast where it is also pin-connected. By removing the pin-connections at the top of the mast, the tower, boom, boom strut, backstay strut and tower backstay can be pivotally raised and lowered as a unit by powered erection rigging mounted on the platform.
    Type: Grant
    Filed: June 7, 1978
    Date of Patent: March 25, 1980
    Assignee: The Manitowoc Company, Inc.
    Inventors: James G. Morrow, Sr., Michael C. Anderson, Richard L. Siehr
  • Patent number: 4143856
    Abstract: Separate torque converters are selectively clutched to the hoist and drag drums of a dragline machine with a selectively engageable clutch providing a power interlock of the output of both torque converters to either one of the drums as desired. Another clutch may be engaged to interlock the two drums together for joint operation by one of the torque converters. Dragline holdback may be achieved by the drag drum brakes, the drag drum converter or the drum interlock thereby providing the operator with considerable flexibility in controlling the path of the drag bucket during hoisting.
    Type: Grant
    Filed: September 23, 1977
    Date of Patent: March 13, 1979
    Assignee: The Manitowoc Company, Inc.
    Inventor: James G. Morrow, Sr.
  • Patent number: 4136855
    Abstract: A hoist drum drive control is provided with both variable displacement and fixed displacement motors geared to the drum and connected in parallel to a variable displacement pump. During high speed hoisting the variable displacement motor is shifted to zero displacement until the back pressure reaches a certain level at which time the displacement is automatically increased until a balanced condition is achieved. When lowering heavy loads a feedback to the variable pump decreases its displacement to prevent over speeding the engine.
    Type: Grant
    Filed: December 3, 1976
    Date of Patent: January 30, 1979
    Assignee: The Manitowoc Company Inc.
    Inventors: James G. Morrow, Sr., David J. Pech, Charles A. Hunter, II
  • Patent number: 4131078
    Abstract: An energy absorbing backhitch for a lift crane including a hollow deformable element which is collapsed between squeeze rollers when the crane is over loaded a predetermined amount with respect to its rated capacity. The backhitch also includes a lift pin and means for sensing deflection of the lift pin and actuating visual and audio signals at predetermined load conditions.
    Type: Grant
    Filed: April 29, 1977
    Date of Patent: December 26, 1978
    Assignee: The Manitowoc Company, Inc.
    Inventor: James G. Morrow, Sr.
  • Patent number: 4103783
    Abstract: A crane assembly which, in heavy lifting configuration, has a platform with boom carrier and counterweight support rotatably mounted on a ring with the mounting including a king pin removably secured to the ring. The platform will easily accept a variety of hoisting machinery. Not only are the boom, mast and ring suitable for other crane configurations, but also the counterweight support and boom carrier are standard subcombinations held rigid with the platform through links defining triangular frames.
    Type: Grant
    Filed: November 25, 1977
    Date of Patent: August 1, 1978
    Assignee: The Manitowoc Company, Inc.
    Inventors: Daniel E. Beduhn, James G. Morrow, Sr., David J. Pech
  • Patent number: 4081081
    Abstract: The back hitch assembly for a lift crane includes hydraulic cylinders for raising the pivotally mounted gantry members and masts. Counterweight lift links are connected between the gantry and the counterweight and the back hitch cylinders may be used to mount and demount the counterweight and the boom hoist winch. The masts, gantry members and back hitch cylinders may be folded back over the bed of the crane for low profile transport or they may be demounted to further reduce weight.
    Type: Grant
    Filed: October 26, 1976
    Date of Patent: March 28, 1978
    Assignee: The Manitowoc Company, Inc.
    Inventors: James G. Morrow, Sr., David J. Pech, Jay Borstad
  • Patent number: 4069884
    Abstract: A self-propelled drive mechanism for a crawler crane or the like including a variable displacement pump and one fixed and one variable displacement motor for each crawler assembly. The displacement of the variable displacement motor may be regulated to alter the combined driving torque and speed imparted by the motors to the crawler assemblies and includes automatic self-balancing feedback means for maintaining the hydraulic pressure within predetermined limits.
    Type: Grant
    Filed: May 12, 1976
    Date of Patent: January 24, 1978
    Assignee: The Manitowoc Company, Inc.
    Inventors: James G. Morrow, Sr., David J. Pech, Norman J. Kutz
  • Patent number: 4050586
    Abstract: A self-erecting mast and boom for a lift crane including self-storing mast cylinders for erecting the mast and rotating a pivoted boom carrier into position to receive the boom which may then be raised by the boom hoist mechanism of the crane. A back hitch assembly including hydraulic cylinders is employed to initially raise the mast and the gantry members which may be lowered into horizontal position to reduce the crane profile for self-propelled transport between job sites.
    Type: Grant
    Filed: October 23, 1975
    Date of Patent: September 27, 1977
    Assignee: The Manitowoc Company, Inc.
    Inventors: James G. Morrow, Sr., David J. Pech, Charles A. Hunter, II, Kenneth J. Porubcansky
  • Patent number: 4042115
    Abstract: A crane assembly which, in heavy lifting configuration, has a platform with boom carrier and counterweight support rotatably mounted on a ring with the mounting including a king pin removably secured to the ring. For portability, the king pin and sections of the ring are removed and a transporter run within the ring and beneath the platform. The platform will easily accept a variety of hoisting machinery. Not only are the boom, mast and ring suitable for other crane configurations, but also the counterweight support and boom carrier are standard subcombinations held rigid with the platform through links defining triangular frames.
    Type: Grant
    Filed: July 28, 1976
    Date of Patent: August 16, 1977
    Assignee: The Manitowoc Company, Inc.
    Inventors: Daniel E. Beduhn, James G. Morrow, Sr., David J. Pech
  • Patent number: 4013174
    Abstract: A load handling device is disclosed having an improved swing drive assembly including a hydraulically driven pivotally mounted swing drive pinion biased against a segmented ring gear by a hydraulic actuator with a guide roller adjacent the pinion engaging a guide flange concentric with the ring gear to limit the maximum tooth engagement between the pinion and ring gear and thereby provide essentially constant backlash on the pinion gear regardless of eccentricities or other irregularities in the ring gear during swing drive operation. When the swing drive pump is shut down a bypass valve is automatically actuated shunting the flow of hydraulic fluid around the pump and a spring operates to counteract the separating force between the pinion and ring gear due to wind induced rotating force which produces torque on the pinion as a result of the back pressure in the motor and the shunted supply-return lines.
    Type: Grant
    Filed: October 22, 1975
    Date of Patent: March 22, 1977
    Assignee: The Manitowoc Company, Inc.
    Inventors: James G. Morrow, Sr., David J. Pech
  • Patent number: 4011955
    Abstract: A sea crane having a rotatable upper works mounted on a cylindrical pedestal with the upper works having a tiedown to the pedestal including an annular collar on the pedestal and a ring-like structure suspended from the upper works beneath the collar and mounted out of contact with both the collar and the pedestal. Tension links couple the bed of the upper works to the ring-like structure to prevent structural failure from bending the bed, or tilting and pulling the upper works either forward or backward from the pedestal.
    Type: Grant
    Filed: March 29, 1976
    Date of Patent: March 15, 1977
    Assignee: The Manitowoc Company, Inc.
    Inventors: James G. Morrow, Sr., David J. Pech