fig1 to 3 show an agricultural machine , according to the invention , embodied in the form of a mower - conditioner 1 . it is hitched to a tractor ( not shown ) which , during use , pulls it in a forward direction 2 . in the description , the following notions &# 34 ; forward &# 34 ;, &# 34 ; rearward &# 34 ;, &# 34 ; in front of &# 34 ; and &# 34 ; behind &# 34 ; are defined with respect to this forward direction 20 the notions &# 34 ; right &# 34 ; and &# 34 ; left &# 34 ; are defined by looking at the mower - conditioner 1 from behind in the forward direction 2 . this mower - conditioner consists of a body 3 that moves along the ground via two wheels 4 , and a drawbar 5 intended to be connected at its front end to said tractor in a manner known to a person skilled in the art . moreover , said drawbar 5 is connected at its rear end to the body 3 by means of a joint 6 with a geometrical axis 7 pointing upward ( in the example shown , this geometrical axis 7 is roughly vertical and extends roughly in the vertical median plane 8 of the body 3 which is oriented in the direction of forward movement 2 .) the angular position of the drawbar 5 with respect to the body 3 can be modified by causing the drawbar 5 to pivot around the geometric axis 7 of the joint 6 . putting the drawbar 5 into the desired angular position and holding the drawbar 5 in the latter are achieved by a hydraulic operating cylinder 9 located between the drawbar 5 and the body 3 . as a result of this arrangement , the body 3 of the mower - conditioner 1 can , particularly during work , extend to the left ( fig1 and 2 ) or to the right ( fig3 ) of the tractor . this enables mowing in both directions of travel . the body 3 of the mower - conditioner 1 firstly comprises a chassis 10 that rests on the ground by means of two wheels 4 which each extend near one respective outer end of said chassis 10 . the body 3 of the mower - conditioner 1 also comprises a harvesting mechanism 11 equipped with cutting components 12 and processing components 13 for the product cut by the cutting components 12 ( in the example shown , the cutting components 12 consist of rotating disks , and the processing components 13 consist of a pair of counterrotating conditioning rollers ; such disks and conditioning rollers being known to a person skilled in the art ). this harvesting mechanism 11 is connected to the chassis 10 by means of a suspension device 14 consisting in the example shown of three suspension rods 15 , 16 , 17 : two lower suspension rods 15 , 16 and one upper suspension rod 17 . these three suspension rods 15 , 16 , 17 form a deformable quadrilateral with the chassis 10 and the harvesting mechanism 11 that allows the harvesting mechanism 11 to move essentially up and down with respect to the chassis 10 in order to adapt itself to the ground terrain independently of said chassis 10 . the harvesting mechanism 11 is powered , for example , by means of the power take - off shaft of the tractor vehicle in a manner known to a person skilled in the art . the movement thus arrives via a shaft 18 supported by the drawbar 5 and is transmitted to a gearbox 19 by a telescopic transmission shaft 20 with universal joints installed between said shaft 18 and the input shaft 21 of the gearbox 19 . this gearbox 19 is connected to the harvesting mechanism 11 and transmits the movement to the drive components of the cutting components 12 and the processing components 13 , not shown , but within the understanding of one skilled in the art . the gearbox 19 is connected to the harvesting mechanism 11 by means of a joint 22 whose geometric axis 23 points upward ( in the example shown , this axis 23 is roughly parallel to the axis 7 and extends in front of this axis 7 ; moreover , it extends slightly to the left of the median vertical plane 8 ). thanks to this joint 22 , the input shaft 21 of the gearbox 19 is always oriented toward the front end of the drawbar 5 regardless of the angular position of this drawbar 5 . positioning and maintenance of the gearbox 19 in the appropriate angular position are accomplished by a control mechanism 24 . this control mechanism 24 firstly comprises a cable 25 connected between the operating cylinder 9 and the gearbox 19 . to this end , the rod 26 of the operating cylinder 9 comprises an extension 27 that extends beyond the joint 28 connecting the operating cylinder 9 to the chassis 10 of the body 3 . said cable 25 also passes through a sleeve 29 that extends between two stop devices 30 , 31 and is compressed by a flexible element 32 . in the example shown , one of these stop devices 30 , 31 is part of the chassis 10 , while the other stop device 31 is part of the harvesting mechanism 11 . this control mechanism 24 also comprises a flexible control component 33 located between the harvesting mechanism 11 and the gearbox 19 . in the example shown , this flexible control component 33 consists of a draw spring . finally , the gearbox 19 also comprises two lugs 34 , 35 that are designed to come into contact with the respective faces 36 , 37 of a stop device 38 . each of these faces 36 , 37 of the stop device 38 thus constitutes a stop . positioning the gearbox 19 into the appropriate operating position is accomplished in the following manner . to move from the mowing position on the left of the tractor vehicle ( fig1 and 2 ) to the mowing position on the right ( fig3 ) one shortens the operating cylinder 9 to make the drawbar 5 pivot in one direction 39 around the geometric axis 7 from working position 5g into working position 5d . by so doing , the extension 27 of the operating cylinder 9 pulls the cable 25 and causes the gearbox 19 to pivot in the same direction 39 around the geometric axis 23 . when the drawbar 5 reaches its working position 5d , the lug 35 of the gearbox 19 is in contact with the face 37 of the stop device 38 . the flexible element 32 allows the lug 35 to be in contact with the stop device 38 when the drawbar 5 reaches its position 5d . in parallel fashion , pivoting the gearbox 19 in this direction 39 stresses the flexible control component 33 , which thereby accumulates energy . to move from the mowing position on the right of the tractor vehicle ( fig3 ) to the mowing position on the left ( fig1 and 2 ), one lengthens the operating cylinder 9 to cause the drawbar 5 to pivot in the other direction 40 around the geometric axis 7 from working position 5d into working position 5g . in so doing , the extension 27 of the operating cylinder 9 no longer pulls on the cable 25 , and it is the flexible control component 33 that will cause the gearbox 19 to pivot in the same direction 40 around the geometric axis 23 . when the drawbar 5 reaches its working position 5g , the lug 34 of the gearbox 19 is in contact with the face 36 of the stop device 38 , and it is kept in this position by the flexible control component 33 . in parallel fashion , the reaction generated by the driving torque applied to the gearbox 19 also tends to cause the gearbox 19 to pivot in this direction 40 and thus assists the flexible control component 33 in keeping the lug 34 of the gearbox 19 in contact with the face 36 of the stop device 38 . the embodiments shown in fig4 to 11 comprise a certain number of elements that have been previously described . these elements will consequently retain the same reference numbers and will not be described again . they also comprise a certain number of elements that are comparable to elements in the mower - conditioner of the preceding example . these elements will be indicated by the same reference number as these comparable elements of the preceding example increased by one hundred ( fig4 and 5 ), by two hundred ( fig6 and 7 ), by three hundred ( fig8 and 9 ) and by four hundred ( fig1 and 11 ). fig4 and 5 show a second embodiment of a control mechanism 124 equipping an agricultural machine 101 . this mechanism comprises a single cable 125 constituting a closed loop that is connected to the operating cylinder 9 and to the gearbox 119 . this cable 125 passes through two half - sleeves 129a , 129b each extending between two stops 130a , 131a , 130b , 131b and each compressed by a respective flexible element 132a , 132b . stops 130a , 130b are part of the chassis 110 of the body 103 , while the other stops 131a , 131b are part of the harvesting mechanism 111 of said body 103 . positioning the gearbox 119 into the appropriate operating position is accomplished in the following manner . to move from the mowing position on the left of the tractor vehicle ( fig4 ) to the mowing position on the right ( fig5 ), one shortens the operating cylinder 9 to cause the drawbar 5 to pivot in the direction 39 around the geometric axis 7 from working position 5g into working position 5d . in so doing , the extension 27 of the operating cylinder 9 pulls on the cable 125 toward the right causing the gearbox 119 to turn in the same direction 39 around the geometric axis 23 . when the drawbar 5 reaches its working position 5d , the lug 35 of the gearbox 119 is in contact with the face 37 of the stop device 38 . these flexible elements 132a , 132b allow the lug 35 to be in contact with the stop device 38 when the drawbar 5 reaches its position 5d . to move from the mowing position on the right of the tractor vehicle ( fig5 ) to the mowing position on the left ( fig4 ), one extends the operating cylinder 9 in order to cause the drawbar 5 to pivot in the direction 40 around the geometric axis 7 from working position 5d into working position 5g . in so doing , the extension 27 of the operating cylinder 9 pulls the cable 125 toward the left causing the gearbox 119 to pivot in the same direction 40 around the geometric axis 23 . when the drawbar 5 reaches its working position 5g , the lug 34 of the gearbox 119 is in contact with the face 36 of the stop device 38 . here , as well , the flexible elements 132a , 132b allow the lug 34 to be in contact with the stop device 38 when the drawbar 5 reaches its position 5g . fig6 and 7 show a third embodiment of a control mechanism 224 equipping an agricultural machine 201 . this consists of an articulated rod assembly that comprises a lever 41 and two rods 42 , 43 . in this embodiment , the lever 41 is connected at its rear end to the chassis 210 of the body 203 by means of a joint 44 . the first rod 42 is positioned between the extension 27 of the rod 26 of the operating cylinder 9 and the middle part of said lever 41 . finally , the second rod 43 is positioned between the front end of the lever 41 and the rear portion of the gearbox 219 . positioning the gearbox 219 into the appropriate operating position is accomplished in the following manner . to move from the mowing position on the left of the tractor ( fig6 ) to the mowing position on the right ( fig7 ), one shortens the operating cylinder 9 in order to cause the drawbar 5 to pivot in the direction 39 around the geometric axis 7 from working position 5g into working position 5d . in so doing , the extension 27 of the operating cylinder 9 pulls on the first rod 42 and makes the lever 41 pivot to the right . when it pivots to the right , the lever 41 pushes on the second rod 43 causing the gearbox 219 to pivot in the same direction 39 around the geometric axis 23 . when the drawbar 5 has reached its working position 5d , the gearbox 219 is also located in its appropriate operating position . to move from the mowing position on the right of the tractor ( fig7 ) to the mowing position on the left ( fig6 ), one extends the operating cylinder 9 in order to cause the drawbar 5 to pivot in the direction 40 around the geometric axis 7 from working position 5d into working position 5g . in so doing , the extension 27 of the operating cylinder 9 pushes on the first rod 42 and causes the lever 41 to pivot to the left . when it pivots to the left , the lever 41 pulls on the second rod 43 causing the gearbox 219 to pivot in the same direction 40 around the geometric axis 23 . fig8 and 9 show a fourth embodiment of a control mechanism 324 equipping an agricultural machine 301 . this mechanism comprises a first control cylinder 45 and a second control cylinder 46 connected in series by means of a conduit 47 . in this embodiment , this first control cylinder 45 and this second control cylinder 46 are of the single - action type . the first control cylinder 45 and the operating cylinder 309 form a unit 48 positioned between the drawbar 5 and the chassis 310 of the body 303 . this unit 48 comprises a cylinder body 49 with an operating chamber 50 and a control chamber 51 . in addition , this unit 48 comprises a rod 326 attached to the chassis 310 by its outside end and whose inside end is designed to extend into the control chamber 51 to form with it the first control cylinder 45 . in its midsection , said rod 326 also comprises an operating piston 52 that extends into the operating chamber 50 in order to form the operating cylinder 309 with it . the second control cylinder 46 is positioned between the harvesting mechanism 311 and the gearbox 19 . finally , the control mechanism 324 also comprises a flexible control component 33 installed between the harvesting mechanism 311 and the gearbox 19 . positioning the gearbox 19 into the appropriate operating position is accomplished in the following manner . to move from the mowing position on the left of the tractor ( fig8 ) to the mowing position on the right ( fig9 ), one shortens the operating cylinder 309 by injecting fluid through the conduit 53 to cause the drawbar 5 to pivot in the direction 39 around the geometric axis 7 from working position 5g into working position 5d . in so doing , the inside end of the rod 326 plunges more and more deeply into the control chamber 51 and expels the fluid contained therein into the second control cylinder 46 through the conduit 47 . as a result , the second control cylinder 46 extends and causes the gearbox 19 to pivot in the same direction 39 around the geometric axis 23 . when the drawbar 5 reaches its working position 5d , the lug 35 of the gearbox 19 is in contact with the face 37 of the stop device 38 . in parallel fashion , pivoting the gearbox 19 in the direction 39 stresses the flexible control component 33 , which thereby accumulates energy . to move from the mowing position on the right of the tractor vehicle ( fig9 ) to the mowing position on the left ( fig8 ), one extends the operating cylinder 309 by injecting fluid via the conduit 54 to cause the drawbar 5 to pivot in the direction 40 around the geometric axis 7 from working position 5d into working position 5g . in so doing , the inside end of the rod 326 withdraws progressively from the control chamber 51 and aspirates the fluid contained in the second control cylinder 46 . the gearbox 19 then pivots in the same direction 40 around the geometric axis 23 under the combined effect of the shortening of the second control cylinder 46 and of the flexible control component 33 . when the drawbar 5 reaches its working position 5g , the lug 34 of the gearbox 19 is in contact with the face 36 of the stop device 38 . in parallel fashion , it is also provided that the reaction generated by the driving torque applied to the gearbox 19 tends to cause the gearbox 19 to pivot in the direction 40 . fig1 and 11 show a fifth embodiment of a control mechanism 424 equipping an agricultural machine 401 . this mechanism comprises a first control cylinder 445 and a second control cylinder 446 connected in a closed circuit by means of two conduits 47 , 55 . in this embodiment , the first control cylinder 445 and the second control cylinder 446 are of the dual - action type . here , too , the first control cylinder 445 and the operating cylinder 309 form a unit 448 positioned between the drawbar 5 and the chassis 310 of the body 403 . this unit 448 comprises a cylinder body 449 with an operating chamber 50 and a control chamber 451 . this unit 448 also comprises a rod 426 joined to the chassis 310 by its outside end and whose inside end comprises a control piston 56 which extends into the control chamber 451 to form with it the first control cylinder 445 . in its mid - section , said rod 426 also comprises the operating piston 52 that extends into the operating chamber 50 to form with it the operating cylinder 309 . the second control cylinder 446 is connected between the harvesting mechanism 411 and the gearbox 219 . positioning the gearbox 219 into the appropriate operating position is accomplished in the following manner . to move from the mowing position on the left of the tractor ( fig1 ) to the mowing position on the right ( fig1 ), one shortens the operating cylinder 309 by injecting fluid via the conduit 53 to cause the drawbar 5 to pivot in the direction 39 around the geometric axis 7 from working position 5g into working position 5d . in so doing , the inside end of the rod 426 and the control piston 56 plunge more and more deeply into the control chamber 451 . the control piston 56 then expels the fluid into the second control cylinder 446 through the conduit 47 . in parallel fashion , fluid contained in the second control cylinder 446 is pumped into the first control cylinder 445 via the conduit 55 . as a result , the second control cylinder 446 extends and causes the gearbox 219 to pivot in the same direction 39 around the geometric axis 23 . to move from the mowing position on the right of the tractor ( fig1 ) to the mowing position on the left ( fig1 ), one extends the operating cylinder 309 by injecting fluid via the conduit 54 in order to cause the drawbar 5 to pivot in the direction 40 around the geometric axis 7 from working position 5d into working position 5g . in so doing , the inside end of the rod 426 and the control piston 56 withdraw progressively from the control chamber 451 . the control piston 56 then expels fluid into the second control cylinder 446 through the conduit 55 . in parallel fashion , fluid contained in the second control cylinder 446 is pumped into the first control cylinder 445 via the conduit 47 . as a result , the second control cylinder 446 shortens and causes the gearbox 219 to pivot in the same direction 40 around the geometric axis 23 . a stop device 38 can be provided in all the embodiments that have just been described said stop device 38 may , moreover , be embodied as a flexible stop such as a rubber stop , for example . various modifications remain possible without departing from the protective scope delimited by the claims thus one can modify the constitution of the various elements described . one can also replace these various elements with technical equivalents finally , one can make all the kinematic inversions technically possible .
an agricultural machine includes a body , a connecting mechanism , an operating device for pivoting the connecting mechanism into at least two working positions , transmission elements which include at least one gearbox , and a control mechanism intended to pivot the gearbox into operating positions corresponding to the working positions of the connecting mechanism . in accordance with the invention , the control mechanism is installed , among others , between the gearbox and the operating device . this control mechanism can also include a first control cylinder installed between the connecting mechanism and the body and connected in series to a second control cylinder installed between the body and the gearbox .