FR2541848A1 - Agricultural cutter - Google Patents

Abstract

The hooks 5e are articulated at 6 between the branches 4%e of a U-shaped fixture 4e welded to one face 10 of a drive shaft 2 of hexagonal cross-section. The hooks 5e bear on a face 9 of the shaft 2 adjacent to the face 10 and on an elastic block 11 arranged between the branches 4%e of the fixture 4e, between the hook 5e and the middle part 4_e of the fixture. This block 11 serves as a damper, the hook 5e being stressed in the direction of the arrow 7 during cutting, the shaft 2 revolving in the direction of the arrow 8.

Description

Agricultural strawberry.

 The present invention relates to an agricultural strawberry.

 Known agricultural strawberries have the disadvantage that their hooks are so stressed, especially during the spawning of stony soils, that their life is generally quite short.

 The object of the present invention is to provide a means of mounting the milling hooks on their drive shaft, with damping, such that the hooks resist more and their lifespan is significantly increased, not to mention all of the strawberry which suffers less when the shocks to which the hooks are subjected are absorbed.

 In addition, the means for mounting the hooks and shock absorbers are extremely simple, so that, when a hook must finally be replaced, this operation is carried out very easily and quickly.

 These goals are achieved by the means defined below.

 The drawing represents, by way of example, an embodiment of the object of the invention and a variant.

 Figure 1 is a perspective view of a tiller equipped with a cutter.

 Figure 2 is a perspective view of one of the milling hooks of said cutter, on a larger scale.

 Figure 3 is a perspective view of a detail, on an even larger scale.

 Figure 4 is an end view of the shaft of this cutter, provided with hooks, on a smaller scale.

FIG. 5 is an elevation view of a half-shaft of the cutter, fitted with its hooks, on the scale of FIG. 4, and
Figure 6 is a perspective view of a detail of a variant.

 Figure 1 shows a tiller equipped with an agricultural cutter generally designated by 1. Such couplings are known, the strawberry shaft being driven by a mechanism comprising a connecting member which connects to the member PTO of the tiller.

 In the present case, the cutter 1 comprises two half-shafts of hexagonal section, one of which, designated by 2, is visible in FIGS. 2 to 4, and which are located in the extension of one another, of on either side of the strawberry midplane. These two half-shafts are connected by a central drive mechanism 3, located between them, visible in FIG. 5. Each half-shaft 2 carries, welded on each of its faces, U-shaped parts 4a to 4g (FIG. 5 ) placed on edge and arranged tangentially with respect to the shaft, serving as mounts for the milling hooks designated by Sa at 5g, respectively. Each face of the half-shaft 2 carries a frame, with the exception of one of them which carries two frames, 4a and 49, located at the two ends of the half-shaft. In addition, the frames are distributed according to the length of the half trees. I1 results in an angular and longitudinal distribution of the hooks along each half-shaft.

 Each hook is constituted by a flat iron, one end of which 5'a to 5'g is folded at a right angle and which is articulated at 6, at a point situated substantially halfway between its end and its folded part, between the two branches, designated by 4'a to 4'g, U-shaped frames 4a to 4g. It follows that the two ends of the hook participate in milling, on two different levels, which improves the mixing of the soil. The shaft 2 rotating in the direction indicated by the arrow 7 in Figure 2, the hooks are biased in. rotation about their axis of articulation 6, in the direction of arrow 8. The hooks are supported, in the opposite direction to that in which they are stressed by milling, against one of the faces, designated by 9 in the figure 2, of the shaft 2 adjacent to that, designated by 10, which carries their mount. In the other direction, that is to say in the direction in which the hooks are biased, these each abut against a block of natural or synthetic rubber 11, in the form of a trapezoidal plate (FIG. 3), engaged in the frame, pressing against the middle part thereof, designated by 4 "e in Figure 2. The mounting is such that each hook has practically no play between the face 9 of the shaft 2 against which it is supported and the damping block 11 of its mount.

 Thanks to this arrangement, the shocks that the hooks can undergo are absorbed by the blocks 11, themselves well protected by the mounts5, which very clearly prolongs the life of the hooks. They can be changed very easily by dismantling the bolts 6 which constitute their articulation on the mounts. Likewise, the blocks 11 can also be replaced very easily when the hooks are dismantled, because they are simply engaged in the mounts and held by the hooks once these have been replaced.

Finally, the hooks 5 constituted by flat irons of very simple shape, are obtained very easily and inexpensively.

Their ends may be of different shapes.

 It should be noted that the various hooks are all planes, with the exception of the hook, designated by 5g, carried by the inner terminal frame 4g of each half-shaft, the folded end of which is at right angles 5'ga furthermore laterally offset, outside the general plane of the hook. The purpose of this arrangement is that the ends 5′g of the two internal hooks 5g are closer to each other than if these hooks were planar, which makes it possible to prevent the drive mechanism 3 of the half-shafts 2 does not create a dead zone in which no milling takes place. I1 will not be necessary to provide offset hooks, such as hooks 59, in the case of a cutter with a single shaft, with lateral drive device.

 The variant of Figure 6 differs from the first embodiment by the shape and construction of the hooks.

Indeed, in this case, the hooks each comprise a central body 12, constituted by a flat iron, engaged between the two branches 4 ′ of the U-shaped frame 4 welded to the shaft 2 of the cutter. This central body 12 ends with two sleeves 12 'in each of which is engaged and welds a hook 13 consisting of a round iron folded in an arc and whose end is pointed at 13'. The added parts 13 may vary in their shape and section.

 It should be noted that the number of hooks on the shaft of the cutter will depend on the width of the latter.

 It is also to be noted that the present cutter may as well be designed to be mounted on an agricultural tractor as on a tiller.

Claims (6)

Claims  1 - Agricultural milling cutter, characterized by the fact that each of its hooks is articulated on a frame secured to the shaft of the milling cutter and is in abutment, in the direction in which it is stressed during milling, against a block of material elastically deformable which acts as a shock absorber.  2 - Costs according to claim lscaracterisee in that each hook is constituted by a flat iron folded at one of its ends at least, articulated on its mount at a point located substantially midway between its ends, so that they both participate in spawning.  3 - Milling cutter according to claim 25 characterized in that the frame of each hook is constituted by a U-shaped piece welded to the edge on the hook drive shaft, disposed tangentially on this shaft, between the branches of which is articulated the hook which, in the opposite direction to that in which it is stressed during spawning, is in abutment against the shaft, the elastic damping block being placed inside said U-shaped piece, between the hook and the part median of it.  4 - Milling cutter according to claim 3, characterized in that the shaft carrying the hooks is of polygonal section, the different U-shaped brackets of the hooks being welded on the different faces of said shaft and distributed along the length thereof  5 - Milling cutter according to claim 4, characterized in that it comprises two half-shafts, of hexagonal section, located on either side of its median plane, and connected by a drive mechanism comprising a connecting member plugging into the PTO member of an agricultural vehicle, each of said half-shafts carrying seven hooks, the two terminals, interior and exterior, are located on the same face of the shaft while the other five are distributed on the other five sides of it.  6 - Milling cutter according to claim 5, characterized in that the two inner end hooks carried by the two half-shafts have their end located outside the general plane of said hooks5 these two ends thus being closer to each other than the rest of these two hooks, so that the drive mechanism does not create a dead zone in which no milling takes place.