FR2789542A1 - Rotating web splitting assembly, comprises a simplified shearing tooth attachment mechanism - Google Patents

Abstract

The web splitting assembly comprises of a tool holder (2) that includes a complementary mounting plate assembly (5). The tool holder and mounting plate assembly are joined via a bolt assembly that includes a head section (61) and a shank that passes through the tool holder and mounting plate assembly. The shank has a stepped region (63) that can receive a locking pin (31) assembly such that the lock plate and tool holder assembly are retained.

Description

I The present invention relates to equipment for

  rotary harrow comprising a set of rotors with plates

  ques tool holders each provided with two locations for receiving a tooth-shaped tool, the locations having holes for the fixing bolts of the teeth. There are multiple types of tool attachment

  on power harrow tool carriers.

  Although there are documents proposing tool attachments by key or by cam and others by bolting, the latter solution is used almost generally since it is more reliable. However, for

  changing a tool, i.e. a harrow tine, you must

  tighten the bolts (in general there are two bolts per or-

  til), then install the new tool and bolt.

  However, as the bolts are exposed to abrasion from the earth, the head or nut may be more or less eroded. As also due to humidity, the screw connection is often seized, we meet for disassembly the double difficulty of not having sufficient attack surface for the keys and that, moreover, it is necessary to exercise

  significant efforts to unlock the screwed, seized connection.

  The result is a relative intervention time-

  long and, above all, which can be difficult to execute in

full field.

  The present invention aims to remedy these drawbacks and proposes to create equipment for a rotary harrow, which allows a quick change of a harrow tooth or of a tool worn or unsuitable for the work to be performed without requiring a very specialized key or the setting in workshop of the harrow, for existing harrows and not

requiring no transformation.

  To this end, the invention relates to equipment of the type defined above, characterized in that it comprises: - an additional plate intended to be screwed under the tool holder plate by the holes normally used to screw a tool, * having in its upper face two cavities open in symmetrical positions with respect to the axis of rotation and opening on the side of the complementary plate to form with the lower surface of the tool-holder plate each time a housing for the tab a tool, - a locking means comprising a hole made in the tab of the tool, a hole in the tool holder and a hole in the complementary plate for receiving a

  tool locking pin.

  Thus, the invention uses the screw holes of the tool holder plate existing on the rotor to fix against the

  underside of the rotor, the complementary plate which forms-

  ra with the rotor the cavities receiving the supports of

  the tool. Once the tools have been installed, it suffices to

  ner by pinning the tabs of the tools on the assembly thus formed. Pins for tool tabs

  advantageously enter the two existing holes

  both generally in the tool holder plate to access

  through these holes to the housing screws.

  As these holes are necessary only at the time

  heavy intervention on the machine, they can perfectly

  be used to install the pins.

  According to another advantageous characteristic, the

  upper side of the complementary plate has parts

  counterpart thicknesses homologous to the housings on the

  of the tool holder plate, to come into these

  housings normally intended for tools.

  This mounting of the complementary plate allows excellent blocking in rotation of the plate thanks to

the embedding of extra thicknesses.

  According to another advantageous characteristic, the

  pin has a body with a portion narrowed at the top

  of the cavity of the complementary plate, to be ver-

  rusted by the movement of the tool tab from the start of the rotation of the tool holder and avoid ejection of

the pin under impact.

  The pin thus constitutes a safety means which protects the tooth against violent accidental impacts. Replacing the pin is an extremely simple operation. According to another advantageous characteristic, the cavity has a bearing surface in the normal position of the tab of the tool with a ramp, in an offset position to receive a part of the tab and allow it to twist.

  under the effect of a force exerted on the tooth.

  This ramp allows, once the pin here-

  protruding, with the tooth to twist and give way so as not to risk

  quer to be destroyed by a shock more violent than that

  producing the only breakage of the pin. This means of pro-

  additional tection is particularly interesting since

  that it does not affect the normal operation of the tool.

  According to another advantageous characteristic, the outer edge of the complementary plate, at the level of the cavity, stops at a certain distance from the junction between the tab and the tooth to leave a length of the tab cantilevered. According to another advantageous characteristic, the cavity of the counter plate has an X shape, with a downstream edge spaced from the upstream edge by a distance greater than the width of the tab of the tool to allow escape

  of the tool by shearing the pin.

  According to another advantageous characteristic, the orifice, produced in the lug to receive the pin, is chosen from the group formed by an orifice located in the lug, on the side of the tooth, an orifice situated near the free end of the part, a notch made in the

  downstream side of the tab, a shoulder, facing the ex-

  térieur, on the downstream side of the leg.

  According to another advantageous characteristic, the tools are easily placed in the housings formed by the cavities. Their extraction is just as simple: we remove the pin and pull the tool. In these conditions,

  tooth replacement can be done even during a process

  vail in a field, without the need for a powerful tool or com-

plicated, nor back to the workshop.

  The invention also makes it possible to transform the equipment of an existing harrow to modify, for example

  the number of tooth locations per tooth holder. It is thus

  if this number can correspond to a symmetry of two or three, that is to say having two teeth in diametrically opposite positions or three teeth distributed regularly at

the periphery of the rotor.

  The present invention will be described below from

  in more detail using the accompanying drawings in the-

which:

  - Figure 1A is a very schematic side view

  that of the rotor of a rotary harrow, - Figure 1B is a bottom view of the rotor of Figure 1A,

  - Figure 2A is a very schematic axial section

  tick of a tool holder and of the equipment according to the invention, in the unassembled state,

  - Figure 2B shows the two parts assembled

  FIGS. 3 is a top view of the complementary plate according to FIG. 2A,

  - Figure 3A partially shows a tooth se-

  lon the invention, - Figure 4A is a sectional view corresponding to Figure 2B, with a tool in place and retained by a pin, - Figure 4B is a radial sectional view of the assembly of Figure 4A, - FIG. 5 is a top view of another embodiment of a complementary plate according to the invention, - FIG. 5A is a view in circular section developed along VV of FIG. 5, - FIG. 6 shows an alternative embodiment of the complementary plate of FIG. 5, - FIG. 7A is a top view of another alternative embodiment of the complementary plate according to the

  Figure 5, the tools being in the normal operating position-

  ment, - FIG. 7B is a view similar to that of FIG. 7A, showing a tool in the unlocked position after the impact of the tool against an obstacle,

  - Figure 8A shows another variant of rea-

  reading in top view of the complementary plate according to FIG. 5, the tools being in the normal position of use, - FIG. 8B is a view similar to that of FIG. 8A showing a tool in the unlocked position after

a shock against an obstacle.

  A rotary harrow has a number of

  rotors rotating in opposite directions to each other

  very. These rotors are carried by a beam equipped with rotational drive means connected to the PTO

of the tractor.

  Such a rotor is shown in side view in FIG. 1A. It consists of an axis 1 to which is connected, in

  lower part, a tool holder plate 2, generally cir-

  circular or at least rounded, having in two diagonal positions

  metrically opposite with respect to the axis of rotation ZZ of the rotor, a housing 21 for receiving the tab 31 of a tool 3 which moreover includes a tooth 32. The tab 31 and the tooth 32 are substantially square. This means that the angle between these two parts is more or less close to a right angle. This does not exclude an angle greater than a right angle like the one shown in the figure. These two parts 31, 32

  can also make an angle in the perpendicular direction

  circular to the drawing sheet plane; the tooth can also

  ment have a certain twist around its axis to open or close vis-à-vis the trajectory, depending

  the tillage effect you want to achieve. This open-

  This closure and obviously depends on the direction of rotation.

tion of the rotor.

  The shape of the teeth is of no particular importance.

lière for the present invention.

  FIG. 1B is a bottom view of the rotor and of its tool holder according to FIG. 1A, showing the shape of the housings 21, that of the legs 31 of the tools 3 and finally the tooth 32 of relatively oval section. the tools 3 are placed with their lug 31 in the housings 21, then they are bolted with two bolts 4 passing through aligned holes 23 in the tool holder 2 and those 33 in the lug 31. FIG. 2A schematically shows the shape of

  the equipment according to the invention, in conjunction with the tool holder plate 2.

  This equipment consists of a complementary plate 5, preferably having, in plan, the shape of the tool-carrying plate 2. This complementary plate 5 has an upper surface 52 intended to be applied against the lower surface 22 of the tool holder plate 2 as well as, if necessary, extra thicknesses 51, homologous to the cavities

  21 by shape and thickness (h) so as to be placed

  cer in the cavities 21 when the complementary plate 5

  is fixed against the underside 22 of the tool plate 2.

  After this installation, the assembly is bolted with bolts passing through the orifices 23 of the tool holder plate

  2 and homologous orifices 53 made in the plate com-

additional 5.

  The additional plate 5 also presents

  in its upper face two cavities 54 diametrically opposed

  openings in its face 52 and on the sides. Starting from the outer edge of the complementary plate 5 (FIG. 3), these cavities 1 have a shape corresponding to that of a tool tab. Each cavity 54 is closed by the underside 22 of the tool holder 2, when the complementary plate 5 is

  assembled to the tool holder 2. The cavity 54 thus forms a housing

ment for the support 31 of the tool.

  In fact, the tool 3A (fig. 3A) composed of a lug

  31A and a tooth 32A has a shape different from the shape con-

  bare and no longer needs to have two holes 33 to be bolted because a single hole is enough or similar means. This orifice 33A of the tab 31A is located in the position of the orifice 24 of the tool holder 2 and, where appropriate, the position of the orifice 55 of the complementary plate 5. When the orifices 33A, 24, 55 are aligned, they can receive a pin, not shown in this figure, which connects the tab 31A of the tooth to the tool holder and to its complementary plate.

  This figure also shows that, according to a

  interesting laughing, the front edge 56 of the housing 54 (on the side facing outwards of the complementary plate 5) is set back to leave part of the tab cantilevered and allow it to play the role of a torsion spring

as will be seen later.

  Installation or dismantling is just as fast. Just extract the pin and then take out the tool. If the latter is trapped by a ground jam, it is enough to strike the tool tooth lightly on the side of the junction with the tab 31A to release the tab and

  allow tool replacement.

  In the description which follows, various

  of embodiments and variants, each tool holder or the complementary plate are designed to receive two tools in diametrically opposite positions relative to the

center of the tool holder.

  The means of the additional plate and the or-

  They will only be described in each case for a tool and its housing, the symmetrical tool and housing carrying the

  same references and their description will not be repeated. Of

  even, in the different figures we will use the same re-

  References as above supplemented by letters for desi-

  enter the homologous elements whose description will not be

fully taken over.

  In these different embodiments, the direction of rotation of the tool holder is indicated by the arrows (C), which makes it possible to define an upstream side and a downstream side of the cavity forming the housing for the tab of the tool, and for

  the upstream edge and the downstream edge of the tool tab.

  FIG. 4A shows, analogously to the figure

  gure 2B, the attachment of a tool in the tool holder according to the invention using a pin 6 comprising a head 61 with a body 62 provided with a narrowed portion 63, that is to say of reduced diameter, itself followed by a portion 64 having the

same section as the body 62.

  The length of the body 62 corresponds to the thickness (E) of the tool holder plate 2 while the length (e) of the narrowed part 63 corresponds at least to the thickness of the housing 54 or of the tab 31 of the tool. Port 33 of

  the tool has a section corresponding to the end 64.

  The pin can also be constituted by a simple rod whose body has a narrowed part

  like the parts 62, 63, 64 of the pin 6 described above

  above but without head so as to be able to enter by in

  below; the body 62 proper will have a slight length

  considerably higher than that of pin 6 above for

  border up with a transverse hole to receive a pin acting as a head. In the event of this pin breaking at the narrowed part, the part which

  rest, that is to say the body 62, will have a sufficient length

  reduced to be able to extract from the top. If the space available was not sufficient, we could drive out the

  key to lower the remaining part of the groove

loots through the hole.

  Figure 4B shows the assembly of Figure 4A in operation. The rotation of the tool holder pulls the tooth 3 outward, in the direction of the arrow F. so that its housing 43 overlaps, by its inner edge (in the direction of rotation of the tool holder), the part narrowed

  63 of stud 6 which is thus blocked and cannot escape ac-

  definitely in the direction of arrow H, even under

  the effect of a shock exerted in this direction on the carrier

tool.

  FIG. 4B also shows that according to a value

  interesting laughing, edge 56 of the complementary plate

  5, in the extension of the cavity 54, stops at a distance

  tance (d) of the elbow connecting tooth 32 to lug 31. Thus,

  the tab 31 is embedded in the cavity 54 with its extremi-

  left tee (according to FIG. 4B) while leaving a length (d) of this tab, in overhang, giving the tool 3 a

  certain elasticity in the manner of a torsion spring.

  FIG. 5 is a top view of a complementary plate 5A provided with two symmetrical cavities 54A in the shape of an X or of butterfly wings. These cavities have an edge

  upstream 541A and a downstream edge 542A. The downstream edge 542A is dis-

  both from the upstream edge 541A by a distance greater than the thickness of the tab 31A of the tool 3A. The tool is fixed using a pin 6, of the type described above,

  placed in the hole 33A of the tab 31A.

  This pin 6 can be sheared under the effect of a violent shock so that the parts 63, 64 fall and the tool can then move back and yield as shown

at the bottom in Figure 5.

  Thus, the tool encountering an obstacle shears the pin 6 without destroying itself. Then just replace

  the pin 6 after replacing the possible tool-

ejected.

  In the case of FIG. 5, the orifice 33A of the

  tab 31A is located near the periphery.

  FIG. 5A is a developed sectional view taken along the section line WVV in FIG. 5. This figure shows in particular a ramp 543A provided in the plate

  complementary 5, under the cavity 54A.

  This ramp 543A allows the tab 31A of the tool to twist to yield to an obstacle, after the shearing of the pin (this is not shown in FIG. A) and retraction of the tab 31A to come into stop against

edge 542A of housing 54A.

  This twisted position is shown in point-

tilled in Figure 5A.

  Figure 6 shows another alternative embodiment.

  tion of the additional plate 5B and especially of the housing

54B receiving the tool tab.

  The tab 31B of this tool is distinguished only by the position of its orifice 33B, offset towards the end, that is to say towards the center of the tool holder or of the complementary plate 5B. Under the effect of a violent shock exerted on

  tool, tab 31B can shear pin 6 and pivot

  ter. For this, the cavity 54B has a downstream edge with a

  part 542B, not parallel to the upstream side 541B, only the part

  544B lower tie being parallel.

  Similarly, the upstream edge 541B has a recess 545B making it possible to receive the corresponding end

of the tab 31B of the tool 3B.

  Figure 7A shows another alternative embodiment.

  with 3C tools in the normal operating position

  FIG. 7B shows the retracted position of a tool 3C. This variant corresponds practically to that of FIG. 5 except that the tab 31C of the tool 3C does not have an orifice but a notch 33C open on the downstream side,

  to hang on a pin 6 identical to the pre-

  cedents. The cavity 54C is also widened on the downstream side, the side 542C being non-parallel to the upstream side 541C for the pivoting of the part 51C to allow the tool

  escape or give in to an obstacle.

  FIG. 7B shows the position of the tool 3C after breaking the pin, the location of which is always shown under the reference 6. The tab 31C then comes

  possibly lean against the downstream side 542C of the cavi-

tee 54C.

  Figure 7B shows only a 3C tool in this

  position, the other tool is not shown.

  FIGS. 8A, 8B show another variant of the holding of the tool according to FIG. 7. In these variants, the tab 31D has a recess 33D instead of the notch

  33C or orifice 33A of the previous embodiments.

  The retention of the 3D tool is always ensured by a gou-

  pill 6. The cavity 54D has a butterfly shape analogous to

that of Figure 5.

  In the normal position, the tool is retained against the ejection, by the pin 6. Under the effect of an impact, the pin 6 is sheared and the 3D tool passes into the position

shown in Figure 8B.

he

Claims (5)

R E V E N D I C A T IONS   1) Equipment of a rotary harrow comprising a set of rotors with tool-carrying plates each provided with two locations for receiving a tooth-shaped tool, - the locations having holes for the tool fixing bolts, each tool (3A) formed of a leg   fixing (31A) and a tooth (32A) at least approximate-   square, characterized in that it comprises: - a complementary plate (5) intended to be screwed under the tool-carrying plate (2) by the holes (23) normally used to screw the tool (3) ,   * having in its upper face (52) two cavities (54) or-   green in symmetrical positions with respect to the axis of rotation (ZZ) and opening onto the side of the complementary plate (5) to form a housing with the lower surface (22) of the tool holder plate (2) for the tool tab, - a tool locking means comprising an orifice   (33A) produced in the tab (31A) of the tool (3A), an ori-   fice (24) in the tool holder (2) and an orifice (55) in the complementary plate (5) to receive a pin (6). 2) Equipment according to claim 1, characterized in that   the upper face (52) of the complementary plate (5) comprises   carries parts (51) in excess thickness homologous to the housings   elements (21) of the underside (22) of the carrier plate   tool (2), to come into these housings normally intended tools.   3) Device according to claim 1, characterized in that the pin (6) has a body with a narrowed part   (63) at the level of the cavity (54) of the complementary plate   keep quiet (5), to be locked by the movement of the tab (31) of the tool (3) from the start of the rotation of the tool holder and avoid the ejection of the pin under the effect of shocks.   4) Device according to claim 1, characterized in that   the cavity (54A) has a bearing surface in the normal position   male of the lug (31A) of the tool (3A) with a ramp (543A), in the offset position to receive part of the lug (31A) and allow it to twist under the effect of an effort exerted on the tooth.    ) Equipment according to claim 1, characterized in that the outer edge (56) of the complementary plate, at the level of the cavity (54), stops at a certain distance (d) from the junction between the tab (31) and the tooth (32) to leave a   length (d) of the cantilever (31).   6) Equipment according to claim 1, characterized in that the cavity (54A, 54B, 54C, 54D) of the counterplate (5A, 5B, C, 5D) has an X shape, with a downstream edge (542A, 542B, 542C, 542D) separated from the upstream edge (541A) by a distance greater than the width of the tab (31A, 31B, 31C, 31D) by   the tool to allow the tool to escape by shears- of the pin.   7) Equipment according to claim 1, characterized in that the orifice, formed in the tab to receive the pin   (6), is chosen from the group formed by an orifice (33A) if-   killed in the tab (31A), on the side of the tooth, an orifice (33B)   located near the free end of part (31B), an enco-   che (33C) made in the downstream side of the tab (31C), a shoulder (33D), turned towards the outside, on the side downstream of the tab (31D).