Patent ID: 6616398
Filing Date: 2003-09-09
Classification: E02F,Y10S

Abstract:
A lift boom assembly movable between lowered and raised positions and adapted for use on a work machine having a longitudinal centerline, a frame with front and rear end portions and upper and lower portions with the front and rear end portions including respective front and rear drive axes, comprising:a pair of supports connectable to the rear end portion of the frame for supporting the lift boom assembly; a pair of lift arm assemblies positionable on opposite sides of the longitudinal centerline and pivotally connected to a respective support, each of the lift arm assemblies including a main lift link with front and rear end portions and a second lift link, the second lift links each having a first end portion, a second end portion pivotally connected to a respective one of the supports to define a first pivot, and a central portion located between the first and second end portions and pivotally connected to the rear end portion of a respective main lift link to define a second pivot; a pair of extendible and retractable hydraulic actuators disposable on opposite sides of the longitudinal centerline and connectable between the frame and a respective lift arm assembly for moving the lift boom assembly between the lowered and raised positions; and a pair of control links with each having first and second end portions, the first end portion of each of the control links being pivotally connected to a respective one of the supports to define a third pivot and the second end portion of each of the control links being pivotally connected to a respective one of the main lift links to define a fourth pivot with each of the first, second, third, and fourth pivots being located above the lower portion of the frame at a vertical height that is at least one-half of the height of the work machine or greater.