Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1979-04-10
1981-07-28
Paperner, Leslie J.
Material or article handling
Vertically swinging load support
Shovel or fork type
414718, 414720, E02F 370
Patent
active
042807832
ABSTRACT:
A hydraulic linkage which is usable as a front loader on an agricultural or other tractor (1) comprises at least one jib, and usually two interconnected jibs (5, 6, 9) which jibs are upwardly and downwardly turnable about an axis (3) relative to frame means (2). Each jib (5, 6, 9) comprises telescopic firt (5) and second (6) portions and the second portions (6) are extendible from the first portions (5) during raising of the jibs so that a load/apparatus carried at the outer end (9) of each second portion (6) is raised substantially vertically, rather than arcuately about said axis (3). Spring (44) operated lost-motion mechanism prevents such extension during a lower arc of movement of the jibs (5, 6, 9) about said axis (3). Raising and lowering is effected by hydraulic rams (13) which preferably have chambers constantly linked by ducts (26) to chambers of second hydraulic rams (17) in such a way that any load/apparatus can automatically be maintained in a chosen attitude to the horizontal during raising or lowering of the jibs (5, 6, 9). The linkage provides improved stability, a substantially constant length of forward reach, improved vertical reach and the facility for automatic self-levelling of loads/apparatuses which are carried thereby.
REFERENCES:
patent: Re23466 (1952-03-01), McElhinney et al.
patent: 2471639 (1949-05-01), McElhinney
patent: 3648871 (1972-03-01), Layton
patent: 3836025 (1974-09-01), Olson et al.
patent: 3952896 (1976-04-01), Hayward
patent: 4162873 (1979-07-01), Smith
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