Self-levelling boom arrangement for an agricultural material dis

Details Self-levelling boom arrangement for an agricultural material dis Self-levelling boom arrangement for an agricultural material dis

1985-02-21

1986-07-08

Blix, Trygve M.

Traversing hoists

Having counterweight or counterbalancing means

212266, 239166, B66C 2372

Patent

active

045988307

ABSTRACT:
A self-levelling boom arrangement for supporting upon a frame of an agricultural material distribution device includes a pair of boom arms extending outwardly from a central support beam. The boom arms are pivotally mounted on a single horizontal pin on the beam for raising and lowering in a vertical plane. The beam is pivotally mounted at a lower end so that the pin can move side to side in the vertical plane. Hydraulic rams are connected to the arms at positions spaced outwardly of the central pin for raising and lowering the arms relative to the frame. Thus, the arms can be raised and lowered independently while the central beam provides a self-levelling effect.

REFERENCES:
patent: 3545678 (1976-12-01), Tangeman
patent: 3887132 (1975-06-01), Widmer
patent: 3957203 (1976-05-01), Bullard
patent: 4221353 (1980-09-01), Kuhn et al.
patent: 4427154 (1984-01-01), Mercil
patent: 4529129 (1985-07-01), Ballu

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