Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1996-03-15
1997-07-15
Underwood, Donald W.
Material or article handling
Vertically swinging load support
Shovel or fork type
91401, E02F 924
Patent
active
056477228
ABSTRACT:
A linkage mechanism which allows a substantially 180.degree. pivoting motion of a frame, and hence a boom arm secured to the frame, around the frame's pivot axis includes a mast to which the frame is fixedly secured, the mast being pivotably mounted on a pivot axis to an associated support frame. First and second hydraulic cylinders, each having a piston rod end and a cylinder end, are connected to respective sides of the mast. A control member is operatively associated with the first and second hydraulic cylinders for effecting a linear movement of the piston rods thereof and hence a pivotal movement of the mast and thus the boom arm secured to the mast about the mast's pivot axis. An overload protection circuit is connected to at least one of the first and second hydraulic cylinders such that the mast, and the frame and boom arm, will pivot around the pivot axis in the event an associated tool secured to the boom arm meets an obstruction. This avoids damage to the associated tool as well as the boom arm. Also provided is a mechanism for selectively disabling the overload protection circuit.
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