Front lifting device for agricultural tractor or the like

Earth working – Mast type hitch

Patent

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Details

172273, 4146955, A01B 5906

Patent

active

055424775

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a front lifting device, for an agricultural tractor or the like, making it possible to hitch a tool to the front of the tractor for the purpose of raising and/or lowering it, this device being of the sort of those which comprise a framework intended to be fixed to the chassis of the tractor, the said framework being equipped, at the bottom, with lower securing means, articulated about a transverse spindle extending forward and at the ends of which the bottom two fastening points of a tool can be fastened, and, at the top, with a middle upper securing means for connection with a third fastening point of the tool, and lifting means, particularly hydraulic ones, provided between the framework and the lower securing means in order to provide the ascending or descending movements, the lower securing means comprising, on the one hand, a primary lower structure articulated, at its rear part, to a transverse spindle carried by the framework, and equipped toward the front with two lateral longitudinal extensions in each of which is provided a transverse bearing and, on the other hand, a forearm associated with each longitudinal extension and articulated about a spindle carried by the abovementioned bearing, the assembly being such that in the working position the forearm extends the lateral extension forward, the said forearm extending, toward the rear, beyond its articulation spindle.


BACKGROUND OF THE INVENTION

A device of this type is known, especially from EP-A-0 182 091.
It is known that such a front lifting device allows the simultaneous use of at least two tools with an agricultural tractor, namely a pushed tool and a pulled tool. However, the development of front lifts runs into several difficulties which should be taken into account if one wishes to make their use more widespread.
A problem arises when the front lifting device is not used.
According to EP-A-0 182 091 the forearms may be placed and held in raised position, by the lifting means, in order to reduce the frontal space requirement of the front lifting device as far as possible. However, in the event of an erroneous maneuver of the lifting means by the operator, the latter may bring about the descent of the forearms when such a descent is not desired and may be troublesome, or even dangerous.
The invention aims, especially, to provide a lifting device which makes it possible to avoid the tiresome consequences in the event of actuation of the lifting means, while the forearms are raised and must remain so.
The lifting device may also constitute a hinderance, particularly if the operator wishes to mount a front loader at the front of his tractor. In such a case, the operator may have to remove the front lifting device beforehand, then install his front loader.
This operation of removing the front lift, for the period in which it is not being used, constitutes a troublesome constraint and a brake to the expansion of front lifting devices.
In addition, some tasks must be carried out alternately and are wholly incompatible with repeated mounting - removal operations.
EP-A-0 274 853 indeed does describe a lifting device allowing compatibility with a front loader. However, the design of this lifting device limits the ground clearance and turn radius when working. The turn radius is also limited in transport because, for folding on each side of the tractor a relatively wide lift device is required, which interferes with the wheels when they are turned.


SUMMARY OF THE INVENTION

The object of the invention, above all, is to provide a front lift device which no longer exhibits the drawbacks recalled hereinabove, or exhibits them to a lesser extent. It is desirable that when this front lifting device is in the storage position on the tractor it cannot be placed in the working position if the lifting means are actuated by mistake or accidentally. It is furthermore desirable that this device should not only be compatible with a front loader, but also that it also should not limit the handleability of the t

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