reference is made to the drawings to describe an embodiment example of interest , though non - restrictive , of the universal tool - holder of the invention and an example of the use of it . the universal tool - holder according to the invention consists of : a main coupling chassis designated in its entirety by reference indicator 1 , this main coupling chassis being constructed in order to be able to be mounted , in a removable manner , on a multi - functional straddling vineyard tractor ; two secondary coupling chassis designated , in their entirety , by the reference indicators 2 a , 2 b , each of these secondary coupling chassis being equipped with a universal three - point hitch system ; mechanisms connecting each secondary coupling chassis 2 a , 2 b to the main coupling chassis 1 ; and mechanisms making it possible to move each secondary coupling chassis 2 a , 2 b , in a vertical or approximately vertical plane and , preferably , in a horizontal or approximately horizontal plane . the main coupling chassis 1 is comprised of a sturdy assembly of metallic parts and it is equipped with mechanisms allowing it to be removably assembled behind the straddling vineyard tractor . these mechanisms consist of , for example : in the upper part , a central joint 3 united with the chassis 1 ; and , in a low part , and on each side of this chassis , a coupling instrument 4 a , 4 b . this central joint 3 and these lateral coupling instruments 4 a , 4 b allow the removable attachment , easy and rapid , of the main coupling chassis on the complementary coupling mechanisms that the rear part of the straddling vineyard tractor usually has . the central joint 3 can be made of a half - collar that attaches by means of nuts and bolts , to a complementary half - collar united with the rear part of the straddling vineyard tractor , while the coupling instruments 4 a , 4 b can be made up of centering cones that engage in the holes or housings in the rear part and are locked by means of a similar bolt or device . the secondary coupling chassis 2 a , 2 b are also comprised of a solid assembly of metallic parts . they are provided on their rear side with a universal three - point hitch system similar to the hitch device of farm tractors , this system consisting of , in the upper part , a coupling rod 5 and , in the lower part , two spaced symmetrical coupling arms 6 a , 6 b . the mechanisms connecting each secondary coupling chassis 2 a , 2 b to the main coupling chassis 1 are comprised of an arm designated in its entirety by the reference indicator 7 . each of these arms consists of at least one sturdy beam 8 connected , by means of its ends and by means of a joint at perpendicular axes or at crosspieces 9 and 10 , on the one hand , to the secondary coupling chassis and , on the other hand , near to one of the sides of the main coupling chassis , respectively . according to another characteristic arrangement , each secondary coupling chassis 2 a , 2 b is connected to the main coupling chassis 1 by means of a connecting rod or tie - rod 11 extending parallel to the beam 8 , preferably above it , and fixed by means of its opposing ends and by means of ball - and - socket joints 12 , 13 , on the one hand , to a cover 2 a united with the upper part of the secondary coupling chassis and , on the other hand , to a cover 1 b united with a horizontal beam 1 a that comprises the upper element of the main coupling chassis 1 , respectively . this connecting rod or tie rod 11 and the beam 8 make up in this way the large sides of a deformable parallelogram arranged in a vertical plane and whose small sides are comprised of portions of the main coupling chassis and secondary coupling chassis delimited by the joints 10 , 13 and 9 , 12 , respectively . in addition , each secondary coupling chassis 2 a , 2 b is connected to the main coupling chassis 1 by means of a connecting rod or tie rod 14 extending parallel to the beam 8 , on the exterior side of it , and fixed by means of its opposing ends and by means of ball - and - socket joints 15 , 16 , on the one hand , to a cover 2 b united with the secondary coupling chassis and , on the other hand , to a lateral element 1 c of the main coupling chassis , respectively . this connecting rod or tie rod 14 and the beam 8 thus constitute the large sides of a deformable parallelogram arranged in a plane perpendicular to the vertical plane and having small sides that are comprised of the portions of the main coupling chassis and the secondary coupling chassis delimited by the joints 10 , 16 and 9 , 15 , respectively . the vertical movements of each arm 7 thus created are ensured by a powerful hydraulic jack arranged below the beam 8 and fixed by means of its opposing ends and by means of ball - and socket joints 18 , 19 , on the one hand , to the intermediate part of the beam , and on the other hand , in the low part of the main coupling chassis 1 , respectively . the horizontal movements of each arm 7 are obtained by means of a hydraulic jack 20 arranged on the interior side of the beam 8 and connected by means of its opposing ends and by means of ball - and - socket joints 21 , 22 , on the one hand , to the intermediate part of the beam 8 , and , on the other hand , to an element affixed to the main coupling chassis 1 , next to the median plane of it . using the configuration that was just described , the arms 7 of the universal tool - holder can be placed together or separately in an endless number of positions , as a function of the requirements . each secondary coupling chassis is equipped with a detector or sensor 23 oriented downwards and installed at the lower end of a vertical element 2 c of the secondary coupling chassis , this element can have a length that is adjustable in a manner so as to permit the adjustment of the position of this sensor as a function of the type of the work performed by the machines m 1 , m 2 installed on the secondary coupling chassis 2 a , 2 b . this sensor drives the electrodistributor of the hydraulic supply circuit of the jacks 17 . when the sensor 23 of one of the arms 7 is located away from the ground , it activates the electrodistributor of the hydraulic circuit for driving the position of this arm , in order to ensure the pivoting of it downwards . do according to another characteristic arrangement , a hydraulic motor 24 is installed fixed on each secondary coupling chassis 2 a , 2 b and the output shaft 25 of this motor or output shaft of the speed multiplier coupled to it is equipped with a universal coupling instrument similar to the power take - off shaft of a farm tractor . it is understood that when a farm tractor is coupled by the universal three - point hitch device to each secondary coupling chassis 2 a or 2 b , the hydraulic motor 24 supported by it permits the activation of the active tools or instruments of the machine , for example , by means of a cardan shaft . according to another characteristic arrangement , the universal tool - holder according to the invention is provided with mechanisms that permit the mounting of removable stands ( 27 a , 27 b ) on which it rests when it is separated from the straddling vineyard tractor ( fig9 ). the main coupling chassis 1 consists of , for example : on the one hand , in the lower part , at the rear and laterally , horizontal sleeves having a quadrangular cross - section 28 , at the longitudinal axis and in which the upper part of the stands 27 a can be engaged , comprised of a coupling part 27 a oriented orthogonally , the assembly being secured by means of a core pin 29 or other connecting rod going through the aligned holes arranged in the sleeves and in the coupling parts ; and , on the other hand , also in the lower part , at the front and laterally , covers or sleeves 30 delimiting the housings oriented transversally and in which the upper part 27 b of the stands 27 b can be engaged , the assembly being secured by a core pin 31 or similar connecting rod going through the aligned holes arranged in the sleeves and in the coupling parts . this arrangement of the universal tool - holder according to the invention makes extremely easy the mounting operations of it on a straddling vineyard tractor and its removal at the end of work . it is shown in fig8 as a usage example , the mounting of hoeing or mowing machines m on the secondary coupling chassis of the universal tool - holder of the invention , but as indicated previously , the purpose of the invention is to make it possible to mount on the tool - holder , at least a pair of various agricultural machines equipped with a standard system for coupling to the universal three - point hitch device of the farm tractor .
removable universal tool - holder for mounting on a straddling vineyard tractor for agricultural work in tree or shrub plantations includes a main coupling chassis constructed so that it can be mounted , in a removable manner , on a straddling vineyard tractor ; two secondary coupling chassis , each provided with a universal three - point hitch system ; mechanisms connecting each secondary coupling chassis to the main coupling chassis ; and mechanisms that make it possible to move each secondary coupling chassis in a vertical or approximately vertical plane and , preferably , in a horizontal or approximately horizontal plane . it is understood that the universal tool - holder can support machines constructed to accomplish cultivation or treatment work such as : hoeing , mowing , plowing , harrowing , spraying , thinning out leaves , pruning , lopping , etc . plantations