Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1991-11-12
1992-12-08
Bartuska, F. J.
Material or article handling
Vertically swinging load support
Shovel or fork type
414686, E02F 3627
Patent
active
051692783
ABSTRACT:
A loader boom assembly has articulated lift arms that have first and second lift arm sections pivotally mounted together. The rear lift arm section is pivotally mounted to rear portions of a prime mover frame. The main lift arm section is substantially longer than the first lift arm section and pivots on the outer end of the rear lift arm link. The lift arm sections are in a folded position when the lift arms are lowered, and a control link is provided to cause the lift arms to unfold as the lift arms are raised to keep the forward portion of the main lift arm section moving along a generally vertical path after a selected lift height to provide a better forward reach of the boom assembly at the higher range of lift. The proportional lengths of the lift arm sections and the control link and the placement of the pivot points and actuators on the main frame also provide structural integrity and efficient power utilization.
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Beltrami Prototype, Melroe Business Unit of Clark Equipment Company.
Title page, table of contents and pp. 72-77 from book entitled "Mechanisms, Linkages and Mechanical Controls," edited by Nicholas P. Chironis (McGraw-Hill 1965).
Albright Larry E.
Hoechst Lonnie D.
Kaczmarski Wally L.
Loraas Orlan J.
Bartuska F. J.
Clark Equipment Company
Underwood Donald W.
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