Arrangement for controlling bulldozer blade

Earth working – Mounting for pushed tool at end of motor vehicle – Transversely mounted blade

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E02F 376

Patent

active

049628160

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION

This invention relates to an arrangement for controlling the attitude or height of a blade of a bulldozer or the like by actuating a plurality of hydraulic cylinders.


BACKGROUND ART OF THE INVENTION

As for the prior art arrangement for controlling a bulldozer blade, there is, for example, one disclosed in U.S. Pat. No. 4,081,036. According to this prior art example, a bulldozer blade is connected to a U-shaped frame through a universal joint means in such a manner that it may be moved up and down, angled to the left and right, and tilted to the left and right relative to the U-shaped frame.
Briefly, by extending or retracting rods of a pair of lifting hydraulic cylinders in the same direction relative to each other, the U-shaped frame is turned vertically about a pair of left and right trunnion shafts for mounting the U-shaped frame onto the vehicle body, so that the blade is moved up and down while it is maintaining its horizontal position.
Further, when rods of a pair of left and right angling hydraulic cylinders are extended or retracted in opposite directions relative to each other, the blade is angled through the universal joint means to the left or to the right.
Further, when the rod of a tilting hydraulic cylinder mounted on the front end of the U-shaped frame substantially in parallel relationship with the blade is extended or retracted, the blade is tilted through a supporting means to the left or to the right.
Thus, the prior art arrangement for controlling a bulldozer blade comprises five hydraulic cylinders for controlling the operation of the blade. The arrangement is made such that by actuating the rods of the five hydraulic cylinders the blade can perform six operations, in total, i.e. upward and downward movements, angling to the left and right, and tilting to the left and right.
However, even by actuating the five hydraulic cylinders, the blade cannot be inclined forwardly or rearwardly as desired; that is, pitching operation of the blade cannot be conducted.


SUMMARY OF DISCLOSURE OF THE INVENTION

The present invention has been made in view of the above-mentioned situation in the prior art bulldozer blade controlling arrangement, and has as its object to provide an arrangement for controlling a bulldozer blade wherein the number of hydraulic cylinders can be reduced to achieve simplification of the construction thereof, and the blade can perform eight operations, in total, i.e., upward and downward movement, angling in the left and right directions, tilting in the left and right directions, and forward and rearward inclination, that is to say its the pitching operation.
To achieve the above-mentioned object, according to the first aspect of the present invention, there is provided an arrangement for controlling a bulldozer blade comprising: a U-shaped frame connected at the leading central part of the semi-circular portion thereof through a coupling means including a spherical shaft to the longitudinally substantially central and lower part of the rear surface of a blade in such a manner that the blade may be turned freely in all directions about said coupling means; a first arm and a second arm each being connected at one end through a bracket to the blade at two places on the rear surface thereof in such a manner that one end of each of the arms may be turned freely, said two places corresponding to left and right positions symmetrically of the longitudinally central part of the blade, at a height which is the same as the coupling means between the frame and the blade; a first hydraulic cylinder and a second hydraulic cylinder each being connected at one end through a bracket to the blade at two places on the upper part of the rear surface thereof which are vertically opposite to the connections between the arms and the blade in such a manner that one end of each of the cylinders may be turned freely; a first lever and a second lever each being connected at one end through a bracket to each of both parallel leg portions of said U-shaped frame, in s

REFERENCES:
patent: 4076080 (1978-02-01), Anderson
patent: 4274213 (1981-06-01), Yadlowsky
patent: 4424871 (1984-01-01), Stickney

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