Patents Assigned to Grove U.S. L.L.C.
  • Patent number: 6012544
    Abstract: The aerial work platform includes a support frame, wheels rotatably attached to the support frame, and an electric motor rotatably driving at least one of the wheels. A boom having a first end is pivotably mounted to the support frame, and a fluid motor raises and lowers the boom with respect to the support frame. A work platform is supported by a second end of the boom. A battery pack supplies power to the electric motor. A first support structure, for supporting an auxiliary power plant that supplements power supplied by said battery pack, removably attaches to the support frame.
    Type: Grant
    Filed: October 24, 1997
    Date of Patent: January 11, 2000
    Assignee: Grove U.S. L.L.C.
    Inventors: Robert D. Backer, Brian S. Hess, Danny J. Skidmore, Gregg A. Wagner
  • Patent number: 5877693
    Abstract: The boom length measurement includes a transmitting unit mounted on the fly section of a multi-section telescopic boom, and a receiving unit mounted on the base section of the multi-section telescopic boom. The transmitting unit transmits a first and second signal having first and second transmission speeds, respectively. The second transmission speed is less than the first transmission speed. Based on a difference in transit times of the first and second signals received by the receiving unit, a length determiner determines the length of the multi-section telescopic boom. A display displays the determined length.
    Type: Grant
    Filed: May 27, 1998
    Date of Patent: March 2, 1999
    Assignee: Grove U.S. L.L.C.
    Inventor: Francis R. Eyler