Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1992-04-09
1994-03-08
Huppert, Michael S.
Material or article handling
Vertically swinging load support
Shovel or fork type
91401, E02F 924
Patent
active
052922200
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. A first hydraulic cylinder having a piston rod end and a cylinder end is pivotably secured at the piston rod end to a first side of the mast. A second hydraulic cylinder having, a piston rod end and a cylinder end is pivotably secured at the piston rod end to a second side 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 and hence a pivotal movement of the mast and thus the boom arm secured to the mast about the mast's pivot axis. At least one of the first and second hydraulic cylinders has overload protection 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.
REFERENCES:
patent: 4048789 (1977-09-01), Cartner
patent: 4065010 (1977-12-01), Worback
patent: 4095436 (1978-06-01), Heitkamp et al.
patent: 4249614 (1981-02-01), van der Lely
patent: 4442658 (1984-04-01), Cartner
Huppert Michael S.
Underwood Donald W.
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