Fluid sprinkling – spraying – and diffusing – With mobile tank-type supply means – Spray boom or bar type distributor
Reexamination Certificate
1999-12-22
2001-11-13
Scherbel, David A. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
With mobile tank-type supply means
Spray boom or bar type distributor
C239S161000, C239S164000, C239S166000, C239S167000, C239S168000, C239S172000
Reexamination Certificate
active
06315218
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the technical field of mounted, trailed or self-propelled agricultural spreading appliances, and more particularly relates to agricultural spraying appliances. Such agricultural appliances are equipped with at least one boom intended to spread, as uniformly as possible, fertilizers or treatment products of the plant protection type on the ground or on crops. The relatively large dimensions of this boom mean that the mounted, trailed or self-propelled spreading appliance has to be of robust construction and appropriately suspended from the chassis.
Suspension devices advantageously allow the boom to move as the spreading appliance moves along over uneven ground. Furthermore, said suspension devices have to be capable of inclining the boom appropriately as the spreading appliance moves along over sloping terrain.
Pendular suspension devices for such booms are already known. These known suspension devices allow the boom to remain parallel to the ground as the chassis of the spreading appliance moves along over unevennesses of the ground. With such a suspension device, the boom is suspended from said chassis by a single articulation which therefore transmits to said boom the jolts which the chassis is experiencing.
There is also known a suspension device for a boom for spreading plant protection products which comprises elements for mounting said boom on a chassis to allow said boom to move with respect to said chassis.
2. Discussion of the Background
A suspension device of this kind is described, for example, in document FR 2 599 941-A1. This document specifically discloses a suspension device comprising two symmetric elements, each of which comprises:
a connecting rod connected, by one of its ends, so that it can pivot with respect to a fixed frame supported by a carrying machine,
a cranked swinging arm, the top of which is mounted so that it can pivot with respect to the boom, while the end of its branch pointing toward the center is articulated to the second end of the connecting rod, and
a tension spring, the ends of which are hooked respectively onto the connecting rod and onto the end of the second branch of the swinging arm facing outward.
A suspension device of this kind exhibits drawbacks. Specifically, it would seem that said suspension device incorporates no means for damping the movements of the boom. Furthermore, it would seem impossible to alter the geometry of the suspension device and thus the dynamic behavior of the boom.
SUMMARY OF THE INVENTION
The purpose of the present invention is therefore to overcome the drawbacks of the prior art by producing a suspension device capable of damping, preferably quickly, the various oscillations to which the boom is subjected as the appliance moves along and whose damping sensitivity can be chosen according to various conditions of use.
The purpose stated to the present invention is achieved by means of a suspension device for a boom comprising elements for mounting said boom on a chassis of the product-spreading agricultural appliance, which device additionally comprises, on the one hand, means for damping the movements of the boom and, on the other hand, adjusting members capable of acting on the elements for mounting said boom so as to vary the position of the instantaneous center of rotation of said boom with respect to the center of gravity thereof, preferably by altering the separation between said center of gravity and said instantaneous center of rotation which is higher up than said center of gravity.
By virtue of a suspension device of this kind, it is possible to influence the dynamic response of the boom. Said boom suspension device may, in effect, as the user chooses, operate in a similar way to a conventional pendular system or operate in a similar way to a link rod system. One or other mode of operation or a combination of the two modes of operation may be selected according to the conditions of use encountered.
An additional purpose of the invention is to produce a boom suspension device which additionally allows the slope of the boom to be adjusted.
REFERENCES:
patent: 4427154 (1984-01-01), Mercil
Kuhn-Nodet S.A.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Scherbel David A.
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