Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1978-04-19
1979-03-13
Paperner, L. J.
Material or article handling
Vertically swinging load support
Shovel or fork type
414708, E02F 330
Patent
active
041437780
ABSTRACT:
A large hydraulic excavator machine for mining operations comprises attachment means for operatively connecting the shovel to the machine frame so that no bending moment is imposed on the component parts of the attachment means during operation of the excavator. The attachment means comprises components including a stroke arm movable by an extendable and retractable hydraulic stroke arm cylinder; and a shovel arm assembly on which the bucket is mounted and which is movable by an extendable and retractable hydraulic shovel arm cylinder. The stroke arm and stroke arm cylinder are pivotally connected at their lower ends to spaced apart points on the excavator frame and are pivotally connected at their upper ends to a common point. The upper end of the shovel arm assembly is also connected to the common point. The shovel arm cylinder has one end pivotally connected to the machine frame (or to an extension therefrom) and has its other end pivotally connected to the shovel arm assembly. The lattice-like arrangement of the components and the location of the points of attack of the stroke arm cylinder and the shovel arm cylinder prevent bending moments from being imposed on the components.
REFERENCES:
patent: RE25495 (1963-12-01), Soyland et al.
patent: 1371344 (1921-03-01), Brackett
patent: 2660816 (1953-12-01), Maxwell
patent: 3129832 (1964-04-01), Metailler
patent: 3606060 (1971-09-01), Fleming et al.
patent: 3828950 (1974-08-01), Schwantes
Harnischfeger Corporation
Nilles James E.
Paperner L. J.
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