Lifting structure for an agricultural tractor

Details Lifting structure for an agricultural tractor Lifting structure for an agricultural tractor

1993-10-20

1995-04-11

Reese, Randolph A.

Earth working

Mast type hitch

414914, 172272, 172677, 172675, 17280-, 280709, 280474, A01B 59042

Patent

active

054049580

ABSTRACT:
An agricultural tractor includes an axle body and a vehicle substructure. A generally vertical lifting structure is rigidly attached to the vehicle substructure and engages a lifting frame which is adjustable in height. The lifting frame carries coupling and/or drive arrangements for implements. A hydraulic cylinder is arranged between the lifting frame and the axle body. The cylinder is connected to a hydro-pneumatic pressure reservoir and functions as an elastic spring support. A lock can be engaged to fix the lifting structure rigidly to the axle body. A transport lock can be selectively engaged to rigidly connect the lifting structure to the lifting frame. A selector valve selective connects the pressure chamber of the hydraulic cylinder with either a hydro-pneumatic pressure reservoir or with a lifting control arrangement. Preferably the lifting structure is designed as a rollover structure.

REFERENCES:
patent: 3066818 (1962-12-01), Simpson
patent: 4174854 (1979-11-01), Spicka et al.
patent: 4186811 (1980-02-01), Bidon
patent: 4423886 (1984-01-01), Taylor
patent: 4424870 (1984-01-01), Weiss

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