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Self-leveling fork lift apparatus

  • US 4,708,577 A
  • Filed: 04/03/1986
  • Issued: 11/24/1987
  • Est. Priority Date: 04/03/1986
  • Status: Expired due to Fees
First Claim
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1. A self-leveling fork lift apparatus for use with a lift truck which includes a wheel supported main frame, a pair of primary load support wheels supported on a first front end portion of the main frame to rotate on a common axis, a pair of integral, parallel, spaced-apart extensions of the main frame extending forwardly of the load support wheels, and means to steer and propel the truck, said apparatus including:

  • A. an elongate mast support bar having a central arc-shape guide portion and two concentric outer end portions, each extending integrally outwardly from the central arc-shape portion;

    B. bar support means to support the concentric outer end portions of the mast support bar on the spaced-apart main frame extensions to position the arc-shape guide portion of the mast support bar to extend downwardly and to lie in a substantially vertical first plane parallel to the support wheels axis;

    C. an arc-shape mast support sleeve supported in surrounding relation to a part of the central portion of the mast support bar to be movable along the arc-shape guide portion of that bar;

    D. a fork lift mast supported on the support sleeve and extending upwardly therefrom;

    E. mast positioning means to position the mast in an upright position with respect to the main frame;

    F. a power operated fork lift carriage supported on the mast for longitudinal movement up and down the mast;

    G. said mast support sleeve being movable between a first position whereby the mast is tilted toward a first side of a second plane perpendicular to the support wheels rotation axis and lying midway between said support wheels, and a second position whereby the mast is tilted toward a second side of the second plane; and

    H. means to move said mast support sleeve along said mast support bar between said first and second positions.

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