Earth working – Tool – standard or connection – Spring biased or formed tool or tool part
Patent
1995-07-17
1996-10-22
Melius, Terry Lee
Earth working
Tool, standard or connection
Spring biased or formed tool or tool part
172643, A01B 3524
Patent
active
055667678
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
When tilling the soil, the use of tilling implements with flexible teeth or rigid teeth mounted on spring-loaded articulations is known.
In the implements known as cultivators, used for loosening the soil, this flexibility is put to use to achieve better loosening using the vibrations of the teeth, but also for freeing the teeth by elastic retraction when they encounter obstacles such as pebbles, stones, branches, etc.
British Patent GB-A-1,025,413 describes a tooth of this type comprising: of the tilling implement by means of clamps, element by a U-shaped body whose interior has a recess for receiving this part,
In practice, the flexibility of the teeth allows them to retract backward describing, in a vertical plane, a release path that gradually raises the active part above the obstacle, then, once the obstacle is past, to return by elasticity to their initial working position. In very stony soil, the teeth more frequently encounter obstacles which, by reason of the only release option being upward, tend to raise them too often, thus altering the quality of work.
Another drawback of this type of tooth is that, under the influence of the vibrations and bending of the blades, their means of removable attachment to the tilling implement and to the tools eventually becomes loose, leading to loss or breakage of elements and hence to lost time.
SUMMARY OF THE INVENTION
One of the objectives of the invention is to furnish a flexible tooth for a tilling implement, that adopts a vertical upward release path only for obstacles that cannot be circumvented, thus providing better work in soil that is stony or has many stumps.
Another objective of the invention is to furnish means of attaching the flexible element to the tilling implement and means of connecting this flexible element with a tooth, allowing interchangeability of one of the elements, which means are simple and not cumbersome while ensuring reliable connection of the elements under any operating condition of the implement.
For this purpose, in the flexible tooth according to the invention, the flexible element comprises several flexible blades which are disposed side by side so that their narrow edges are in contact, each blade having a curved upper end, the blades being connected to each other: an L-shaped cross section pressing the curved ends of the blades against the lower forward angle of a cross member under the clamping effect of clamps, blades, engaging holes provided at least in the side blades, the arm of the tool, and the interior of the body.
Thus, to supplement its vertical retraction option, the tooth has transverse flexibility enabling it to attempt to circumvent obstacles before rising, which improves the quality of the work.
Because of their positive mounting, the blades of which the flexible part of the tooth are composed are held in a torsionally rigid manner and there is no risk of their tangling with each other and losing their efficiency when the tooth moves.
Also, it is possible very rapidly and easily to replace the active part of each tooth by acting only on the bolts that attach the tooth to the ends of the blades.
DESCRIPTION OF THE DRAWINGS
The invention will in any event be better understood from the description which follows with reference to the attached drawing figures that show, as a nonlimiting example, one embodiment of this tooth, in the case when it has three blades.
FIG. 1 is a perspective view of an embodiment of the invention;
FIG. 2 is a cross-sectional view showing the attaching means of the blade ends in greater detail;
FIG. 3 is a cross-sectional view along III--III in FIG. 2;
FIG. 4 is a view similar to FIG. 3 showing one embodiment of this tooth; and
FIG. 5 is a cross-sectional view along III--III in FIG. 2.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
In the FIGS., numeral 2 designates a cross member of a tilling implement, 3 designates a flexible element, and 4 an active element comprised of an arm 5 carrying a tool, not shown.
The flexible element is comprised of several blades, for e
REFERENCES:
patent: 417746 (1889-12-01), Shank
patent: 565505 (1896-08-01), Publow
patent: 1746092 (1930-02-01), Sutton
patent: 1992313 (1935-02-01), Langley
patent: 3737156 (1973-06-01), Ward
patent: 4079790 (1978-03-01), Guttler
patent: 5007484 (1991-04-01), Johanson
Dubreuil Gerard
Dubreuil Jean
Masson Joseph
Manufacture De Ressorts De Terrenoire
Melius Terry Lee
Novosad Christopher J.
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