Patent ID: 7448453

Claim:
In an attachment for a work vehicle, the improvement comprising: a support; a tool having a top transverse edge, a bottom, ground-engaging transverse edge, and a front face extending between said edges, said tool being mounted on said support for flip-over movement of the entire tool about a transverse axis between an upright position in which the top edge is above the bottom edge with the front face facing forwardly and an inverted position in which the top edge is below the bottom edge with the front face facing rearwardly; and a power device operably coupled with the tool for effecting said flip-over movement, said support including a stationary portion and a swivel head mounted on said stationary portion for left and right swivelling movement about an upright axis, said tool being mounted on said swivel head for left and right swivelling movement therewith between opposite, left and right obliquely disposed positions, further comprising power mechanism operably connected between the stationary portion and the swivel head for effecting said swivelling movement of the swivel head, said power device being connected between said swivel head and the tool, said power device comprising a double-acting, extendible and retractable, hydraulic piston and cylinder unit pivotally mounted on said swivel head at a first pivot, said piston and cylinder unit being pivotally connected to said tool at a second pivot, said tool being pivotally mounted on said swivel head at a third pivot spaced below said first pivot, said second pivot being disposed vertically between said first and third pivots when the tool is in its upright position and being disposed vertically below said third pivot when the tool is in its inverted position.