FR2521389A1 - CUTTING DEVICE FOR MOWER - Google Patents

Abstract

CUTTING DEVICE FOR MOWER. IT INCLUDES SEVERAL ROTARY CUTTERS 19, 20 IN THE FORM OF DISCS, PRACTICALLY HORIZONTAL, OFFSET ALONG A LINE EXTENDING IN THE DIRECTION OF THE WIDTH OF THE MOWER. THE ROTATION AXIS 21 OF THE SAID CUTTERS IS SLIGHTLY INCLINED FORWARD, THESE CUTTERS ALSO BEING OFFSET IN THE AXIAL DIRECTION. ORGANS PLACED CLOSER TO THE FRONT OF THE CUTTING DEVICE ARE AXIALLY HIGHER THAN THOSE PLACED FURTHER REAR. APPLICATION: MOWING ON HORIZONTAL OR INCLINED SURFACES (ROAD SIDES).

Description

The present invention relates to a cutting device for

  mower which comprises a plurality of substantially circular, rotatable circular cutters aligned transversely, with a certain mutual offset, in the widthwise, or transverse direction, of the mower.

  Mowers fitted with rotating cutters

  In addition, disc mowers are generally more efficient and have better mowing properties than cylinder mowers. In addition, disc mowers are generally more efficient than those with reciprocating cutter bars. On the other hand, disc mowers generally cost more than cylinder mowers because their transmission mechanism is traditionally based on the use of gears: housed in an oil sump, which increases

  considerably manufacturing costs.

  It is an object of the present invention to provide an inexpensive disc mower with mowing qualities, reliable operation and durability.

  are at least equal to those of the best mowers

  Another object of the invention is to provide a

  to cut hay on inclined surfaces.

  for example, on the shoulder or shoulders of

  roads, while the tractor carrying the road mower

  on a horizontal surface Another object of the invention

  is to describe a mode of construction in which a braking

  the speed of rotation of a single disc, or even

  immobilization of any disk, does not have an influence

  this considerable on the rotational speed of the other -discs.

  The invention achieves the goals it has

  fixed by proposing a mower in which the rotational axis

  tion of said cutting members is slightly inclined forward

  and said cutting members are also offset in their

  axial direction the cutting members which are closer to the front of said cutting device being axially more

  higher than those placed further back from it.

  cutting units at different levels

  in the direction of the axis of their trees allows for closer

  these bodies without resulting in

  Moreover, this does not require a synchronization of the rotation of the adjacent cutting members. By arranging the cutting members so that they partially overlap, a covering of the mowing areas is obtained. adjacent, which gives good results Uniform mowing results are obtained by the fact that the front edges

  cutters are all practically the same

  When the device is in the horizontal working position, the vertical elevation of the

  cutting elements is at least practically

  the same for all cutting tools in the posi-

  extreme frontal effect of these cutting elements.

  Thanks to an articulated connection between the

  tif of cutting and its motor unit, mowing on an

  inclined road can be easily performed even when

  that the tractor carrying the mower rolls on the road.

  The energy to turn the cutters is trans-

  starting from a tractor shaft by means of

  transmission Devices or means for inclining

  The reliable, inexpensive and uncomplicated transmission may include a V-belt transmission which, in turn, allows a certain inclination of the transmission device.

  A greater angle of inclination is achieved by using

  in the V-belt transmission an adjustable pulley Transmission of the tractor's energy to the mower may require one or more universal joints to allow the desired angular variations between the connected rotary shafts. The use of a V-belt transmission in the cutting device allows any one of the cutting members to slow down without

  this has an essential influence on the speed of others.

  Other features and advantages of the

  come out of the description which will follow, made

  by way of illustration and in no way limitative, with reference to the above-mentioned figures E 1, in which FIG. 1 is a rear view of an embodiment of a mower according to the invention; Figure 2 is a plan view of the cutting device of the mower of Figure 1, the hood being removed (following II-II of Figure 1). Figure 3 is a sectional view along the line III-III of Figure 1; Figure 4 is a sectional view along the line IV-IV of Figure 3 la -la Figure 5 is a sectional view corresponding to Figure 4 and showing a second embodiment of the invention; Figure 6 is a sectional view of a portion of the embodiment of Figure 5; and FIG. 7 is a corresponding sectional view

  in Figure 3 of a third embodiment of the

  cutting device of a mower according to the invention.

  In the drawings, the reference I designates, in a general manner, the cutting device of the mower

  shown and reference 2 has a stepped pulley for

  trapezoidal groove that can be connected to the tree 2 hours of

  a tractor engine or other A trapezoidal belt

  dale 3 transmits the energy of the shaft 2b and the pulley

  2 a to the cutting device 6 of the machine The working belt

  pezoidal passes on a roller 2 c guide and on a second stepped pulley 4 fixed on the main shaft 5 of the cutting device 6 The position of the roller 2 c guide

  makes it possible to rotate the cutting device 6 to a position

  vertical transport During work, the provision of

  tif of the cut is set by means not shown,

  to be practically parallel to the surface of the ground.

  The cutting device 6 comprises a protective cover 7 inside which the shaft 5 is rotatably mounted in a bearing 9 The cover 7 has a front wall 8 Of the pulley 4, the energy is transmitted via of the shaft 5, a universal joint 10, 10a and a second shaft I to the first pulley 18 of the cutting device 6 During the transport, the elements 10 and the can be disconnected one of the other The cutting device further comprises two base plates 12 and 13

  These plates are connected by side walls

  The hood 7 is connected to the plate 12 by means of fixing elements 15.

  16 and 17 fixed respectively to the plates 12 and 13.

  A second trapezoidal belt 26 transmits the energy of the pulley 18. In FIG. 1, two circular cutters 19 and 20 are seen, the cutting member 19 being placed slightly behind the member 20. Each cutting member is connected to a shaft 21 which rotates in a bearing 22 fixed to the plate 12 A stepped pulley 23 is connected to each shaft 21 in order to transmit the energy of the pulley 18 by means of a trapezoidal belt 26 loaded by a tensioning roller 24, as shown in FIG. 2 The cutting members 19, 20 are provided with radial blades 25 a

and b.

  In FIG. 2, the cover 7 and the elements

  15 were removed The contact area o <of each

  pulley 23 of the cutting member with the trapezoidal belt

  dale 26 must be at least 450 The blades include one, to the good, as shown, two cutting edges 29 All

  blades of the cutting elements are identical In

  the blades 25a of the cutting member 20 and the blades 25b of the cutting member 19, the opposite cutting edge 29 is placed in the working position because the members 19

  and turn in opposite directions. Such an operation

  The blades are attached to the disc-shaped cutting members by means of screws 30 received in holes 31 (FIG. 4). It is possible to adjust the angle.

  blades by changing or rotating a member 32 of

  blade port Reference 33 refers to an element for

  fix the circular cutting member to its shaft 21.

  The plates 12 and 13 have portions 28

  protruding forward to protect the cutting disc.

  At the position of the cutting members 19 and 20, only the

  I advance beyond the salient features 28 a and 28 b.

  The direction of movement of the mower is indicated on

  Figures 2, 3, 4, 5 and 7 by a large arrow.

  The staggered arrangement of the cutting members is clearly visible in FIGS. 3 and 4. This arrangement makes it possible to place them very close to one another. Thus, one obtains a covering of the work areas of the cutting members.

  neighbors, which is favorable for the effectiveness of the

  The cutting device is placed slightly obliquely, as can be seen in FIGS. 4 and 5. The offset between the cutting members both horizontally and in the axial direction is such that the distance h between the ground level and the ends of the blades, when they are in their extreme frontal position is the same for all

cutting organs.

  A second embodiment of the invention

  is shown in FIGS. 5 and 6, in which the transmission

  Energy is transferred to the cutting members from below. The driving pulley 18, the pulleys 23 of the cutting members and the belt tension roller 24 are housed in a space 13 formed between the plates 12 and 12. The space 13 may be completely closed, or its rear wall 13b may be left open.

  and 22 has shafts 11 and 21 are basically mounted together

  Bearings 16 and 22 of FIG. 1 are attached to plate 13 with bearings 17a. Under plate 13 can be arranged a movable support member 13c for lifting plate 13 slightly above the surface of the ground. universal joint 10, l Oa (Figure 6) allows to tilt the cutting device over any axis passing

by the joint.

  Figure 7 shows a variant in the-

  the number of cutting elements of the mower has been increased It is not necessary that the number of cutting members is the same in the front and rear rows The cutting members are shifted and driven as in the other embodiments When one of the cutting members temporarily encounters a strong resistance, its speed can decrease without having a considerable effect on the others, which would have been impossible if a transmission

  traditional gear had been used.

  It goes without saying that many modifications can be made to the exemplary embodiments shown and described, without departing from the scope of the invention.

  Thus, instead of blades, the cutting elements can

  could be equipped with similar flexible metal wires

to whips.

Claims (5)

  1 cutting device for mower, which   comprises a plurality of cutting members in the form of rotatable discs   characterized in that the axis of rotation of said cutting members (19, 20) is inclined slightly, substantially horizontal, aligned, with a certain mutual offset, in the direction of the width or in the transverse direction of the mower; forward and in that said cutting members (19, 20) are also offset in their axial direction, the cutting members which are closer to the front of said device being axially higher than those placed further back from it.   2 Device according to claim 1, characterized   in that the cutting areas of the cutting   partially overlapping.   Device according to claim 1 or 2,   characterized in that, when in a working position   horizontal vale, vertical elevation of cutting elements   (25a, 25b) of said cutting members is at least practical-   the same for all cutting elements at   extreme frontal of said cutting elements.   4 Device according to any one of the   prior art, characterized in that a cutting device carrying said cutting members is pivotally supported with respect to a driving unit, for example, a tractor, so as to enable said cutting device to pivot or tilt relative to it and in that the transmission of energy between said power unit and said cutting members is arranged to allow   said tilting or tilting.   Device according to any one of the preceding claims, characterized in that the transmission for rotating said cutting members (19, 20) is   a trapezoidal belt transmission (3, 26) these.   Device according to claim 4, characterized   characterized in that it is connected to the power transmission shaft (5) of the primary drive unit via a universal joint (10, 1 Oa), and in that it comprises means for tilting or turning around an axis   passing through said universal joint (10, 10 a).