SUSPENSION AND HANDLING DEVICE FOR PORTABLE

AGRICULTURAL MACHINERY SUCH AS SHAKERS AND THE LIKE

The present invention relates to a portable agricultural tool, such as a shaker or the like.

Usually, such tools are used for the care of gardens, fields, and/or forests. From the constitutive point of view, a portable agricultural tool of a type known in the technical field pertaining to the present invention, comprises a machine body, a connection apparatus and a hand-held portion.

The machine body comprises a central portion extending along a main axis and, mounted on opposite sides of said central portion, a tool and a drive motor of the tool. In particular, the drive motor is configured to generate an alternating force having at least one component parallel to the main axis.

The hand-held portion is operatively manually graspable by an operator and extends at least partially along a respective auxiliary axis which is parallel to the aforesaid main axis.

The connection apparatus is interposed between the machine body and the hand-held portion. In particular, the connection apparatus is adapted to connect the machine body in suspension to the hand-held portion and is configured to attenuate the alternating force transmitted by the drive motor to the hand-held portion in order to improve the comfort of the operator during use of the portable agricultural tool.

Agricultural tools of the known type, even in their most modern implementations, have some structural, operational and/or economic/productive disadvantages which make the use and creation thereof problematic.

Firstly, the connection portions of the known devices are poorly performing. In other words, the connection portions of the agricultural tools of the known type are functionally inefficient in attenuating the forces which are generated on the hand-held portion during use to the disadvantage of the comfort and well-being of the operator.

Therefore, the technical task of the present invention is to provide a portable agricultural tool which does not present the same drawbacks inherent in the currently known art.

None the less, an object of the present invention is to provide a portable agricultural tool which ensures optimal conditions of comfort and wellbeing to the operator during the steps of use of the portable agricultural tool.

A further object of the present invention is to provide a portable agricultural tool which is extremely performing.

The specified technical task and the specified objects are substantially achieved by a portable agricultural tool object of the present invention, as detailed in the contents of the claims below and/or in the contents of the present disclosure.

In the present disclosure, the term “portable agricultural tool” is intended to mean a portable motorized tool which is used in the care of gardens, fields, and/or forests.

Preferably, but not limitedly, the portable agricultural tool is of the type known in the technical field pertaining to the present invention with the term "shaker" (but depending on the needs of the moment it can also be a "blower" or similar portable machinery).

The specified technical task and the specified objects are substantially achieved by a portable agricultural tool comprising a machine body, a hand-held portion and a connection apparatus.

The machine body comprises a central portion extending along a main axis. The machine body further comprises a tool and a drive motor of the tool mounted on opposite sides of the central portion.

The drive motor is configured to generate an alternating force at least along the main axis.

In other words, the drive motor is configured to move the tool so that it performs an alternating movement (forwards and backwards) along a trajectory which has at least one component parallel to the main axis.

Preferably, the drive motor is configured to move the tool so that it performs an alternating movement (forwards and backwards) substantially parallel to the main axis.

According to an example, the tool comprises a vibrating rod whose operating end is coupled or couplable to a gripping hook.

The hand-held portion is operatively manually graspable by a user. In other words, during proper use of the portable agricultural tool, the operator holds the portable agricultural tool by grasping the hand-held portion.

Such a hand-held portion has a hand-held rod extending along a respective auxiliary axis. Such an auxiliary axis is parallel to the main axis. According to an example, the hand-held portion can further comprise handles or other ergonomic portions, which facilitate gripping the handheld portion itself. Such ergonomic handles or portions can extend away from the hand-held rod and can extend transversely to the hand-held rod.

The connection apparatus is interposed between the central portion of the machine body and the hand-held portion. The connection apparatus is adapted to connect the machine body in suspension to the hand-held portion.

Functionally, the connection apparatus is configured to attenuate the alternating force transmitted by the drive motor to the hand-held portion.

The connection apparatus comprises a fixing element operatively and integrally constrained to the hand-held rod.

The connection apparatus further comprises a front connection arm and a rear connection arm.

The front arm has a respective first end constrained to the central portion of the machine body.

According to an example, the first end of the front arm can be directly constrained to the central portion of the machine body.

According to a further example, the machine body can comprise a rod-like portion coaxial to the main axis, on which at least one front transverse appendage is stably mounted. In particular, in such an example, the front transverse appendage is connected to the first end of the front arm in an eccentric portion with respect to the main axis. Preferably the front transverse appendage extends away from the main axis in the opposite direction to the hand-held portion and still more preferably is perpendicular to the main axis.

Preferably, regardless of the presence or not of the front transverse appendage, the first end of the front arm is hinged to the machine body.

Even more preferably but not limitingly, the first end of the front arm has a hinge provided with one or more grooved elastic plugs for defining respective torsional plugs contrasting the rotation of the front arm.

Advantageously, such a technical feature allows to optimize the action of attenuation of the alternating force generated by the drive motor, improving the efficiency of the connection apparatus.

The front arm also has a respective connection portion, distal from the first end of the front arm and applied to the hand-held portion.

According to an example, the connection portion of the front arm is defined by a second end of the front arm, opposite the first end of the front arm.

According to an aspect, the connection portion of the front arm can be defined by a respective hinge arranged in a sliding position along the hand-held portion and defining a respective oscillation axis perpendicular to the main axis and the auxiliary axis.

Alternatively, the connection portion of the front arm can be defined by a respective hinge arranged in a fixed position along the hand-held portion and defining a respective oscillation axis perpendicular to the main axis and the auxiliary axis.

Also, the rear arm has a respective first end constrained to the central portion of the machine body.

According to an example, the first end of the rear arm can be directly constrained to the central portion of the machine body. According to a further example, the machine body can comprise a rod-like portion coaxial to the main axis, on which at least one rear transverse appendage is stably mounted. In particular, in such an example, the rear transverse appendage is connected to the first end of the rear arm in an eccentric portion with respect to the main axis. Preferably the rear transverse appendage extends away from the main axis in the opposite direction to the hand-held portion and still more preferably is perpendicular to the main axis.

Preferably, regardless of the presence or not of the rear transverse appendage, the first end of the rear arm is hinged to the machine body.

Even more preferably but not limitingly, the first end of the rear arm has a hinge provided with one or more grooved elastic plugs for defining respective torsional plugs contrasting the rotation of the rear arm.

Advantageously, such a technical feature allows to optimize the action of attenuation of the alternating force generated by the drive motor, improving the efficiency of the connection apparatus.

The rear arm also has a respective connection portion, distal from the first end of the rear arm and applied to the hand-held portion.

According to an example, the connection portion of the rear arm is defined by a second end of the rear arm, opposite the first end of the rear arm.

According to an aspect, the connection portion of the rear arm can be defined by a respective hinge arranged in a sliding position along the hand-held portion and defining a respective oscillation axis perpendicular to the main axis and the auxiliary axis.

Alternatively, the connection portion of the rear arm can be defined by a respective hinge arranged in a fixed position along the hand-held portion and defining a respective oscillation axis perpendicular to the main axis and the auxiliary axis.

According to a further aspect, the first and second connection portions are arranged on opposite sides of the fixing element.

The connection apparatus further comprises an attenuation assembly configured to attenuate the alternating force transmitted by the drive motor to the hand-held portion.

The attenuation assembly comprises a front elastic element and a rear elastic element.

According to an aspect, the elastic element is interposed between the front arm and the fixing element while the rear elastic element is interposed between the rear arm and the fixing element.

According to an example, the front and rear elastic elements can comprise elastic plugs.

According to a further example, the front and rear elastic elements can comprise tubular bellows elements.

According to a further example, the front and rear elastic elements can comprise both elastic plugs and tubular bellows elements.

According to a further example, the front and rear elastic elements are made in the form of arms in deformable material, preferably elastomeric.

According to a further aspect, the front elastic element and the rear elastic element lie aligned on an attenuation axis parallel to the main axis and are opposite with respect to the fixing element.

Advantageously, such a technical feature determines an optimal attenuation of the alternating force generated by the drive motor, since the front and rear elastic elements operate in an opposite manner. In other words, for example, when the front elastic element is compressed, the rear elastic element is placed in traction and vice versa such that such front and rear elastic elements can operate in synergy.

According to a further aspect, regardless of the mutual arrangement of the front elastic element and the rear elastic element, at least one of the front elastic element and the rear elastic element can be in a state of pretension or a state of pre-compression.

In other words, at least one of the front and rear elastic elements, preferably both, are mounted on the portable agricultural tool so that they result in a pre-tensioning state or in a pre-compression state even in a non-operating state (off) of the portable agricultural tool.

According to an example, only between the front elastic element and the rear elastic element results in a pre-tensioning state.

According to a further example, only between the front elastic element and the rear elastic element results in a pre-compression state.

According to a further example, both the front and rear elastic elements result in a pre-tensioning state.

According to a further example, both the front and rear elastic elements result in a pre-compression state.

Advantageously, such a technical feature allows a better response of the front and rear elastic elements to the alternating force generated by the drive motor.

According to a further aspect, the fixing element can be configured to change a value of the pre-tensioning state or the pre-compression state of the front elastic element and/or the rear elastic element.

Advantageously, such a technical feature allows to adjust the response action of the front elastic element and/or the rear elastic element to the alternating force generated by the drive motor, so that the operator can adapt the portable agricultural tool to his needs.

According to a further aspect, the fixing element can be at least partially made of an elastically deformable material.

Advantageously, such a feature allows the elastic element to participate in the response action of the front elastic element and the rear elastic element during operations so as to improve the efficiency of the connection apparatus.

The aforesaid portable agricultural tool achieves the proposed objects, eliminating the highlighted drawbacks of the prior art.

Such a result is achieved in particular by the use of the front elastic element and the rear elastic element.

Such a result can also be achieved by using the front elastic element and the rear elastic element in cooperation with the hinges of the front arm and the rear arm provided with one or more grooved elastic plugs to define respective torsional plugs.

Likewise, such a result can be achieved by using only the hinges of the front arm and the rear arm provided with one or more grooved elastic plugs to define respective torsional plugs, regardless of the presence of the front elastic element and the rear elastic element or in any case of the other structural features illustrated below.

The specified technical task and the specified objects are substantially achieved by a further portable agricultural tool comprising a machine body, a hand-held portion and a connection apparatus.

The machine body comprises a central portion extending along a main axis. The machine body further comprises a tool and a drive motor of the tool mounted on opposite sides of the central portion.

The drive motor is configured to generate an alternating force at least along the main axis.

In other words, the drive motor is configured to move the tool so that it performs an alternating movement (forwards and backwards) along a trajectory which has at least one component parallel to the main axis.

Preferably, the drive motor is configured to move the tool so that it performs an alternating movement (forwards and backwards) substantially parallel to the main axis.

According to an example, the tool comprises a vibrating rod whose operating end is coupled or couplable to a gripping hook.

The hand-held portion is operatively manually graspable by a user. In other words, during proper use of the portable agricultural tool, the operator holds the portable agricultural tool by grasping the hand-held portion.

Such a hand-held portion has a hand-held rod extending along a respective auxiliary axis. Such an auxiliary axis is parallel to the main axis. According to an example, the hand-held portion can further comprise handles or other ergonomic portions, which facilitate gripping the hand- held portion itself. Such ergonomic handles or portions can extend away from the hand-held rod and can extend transversely to the hand-held rod. The connection apparatus is interposed between the central portion of the machine body and the hand-held portion. The connection apparatus is adapted to connect the machine body in suspension to the hand-held portion.

Functionally, the connection apparatus is configured to attenuate the alternating force transmitted by the drive motor to the hand-held portion.

The connection apparatus comprises a front connection arm and a rear connection arm.

The front arm has a respective first end constrained to the central portion of the machine body.

According to an example, the first end of the front arm can be directly constrained to the central portion of the machine body.

According to a further example, the machine body can comprise a rod-like portion coaxial to the main axis, on which at least one front transverse appendage is stably mounted. In particular, in such an example, the front transverse appendage is connected to the first end of the front arm in an eccentric portion with respect to the main axis. Preferably the front transverse appendage extends away from the main axis in the opposite direction to the hand-held portion and still more preferably is perpendicular to the main axis.

Regardless of the presence or not of the front transverse appendage, the first end of the front arm is hinged to the machine body.

Preferably, the first end of the front arm has a hinge provided with one or more grooved elastic plugs for defining respective torsional plugs contrasting the rotation of the front arm with respect to the machine body. Structurally, the machine body can define a seat having a polygonal section, preferably square. The first end of the front arm has a pin which also has a polygonal section, preferably square. One or more grooved elastic plugs are placed between the seat and the pin. Functionally, when the front arm rotates, such one or more elastic plugs store a potential elastic energy which can be transformed into work, generating a mechanical thrust which can be exerted on the front arm in contrast to its rotation.

Advantageously, such a technical feature allows to optimize the action of attenuation of the alternating force generated by the drive motor, improving the efficiency of the connection apparatus.

The front arm also has a respective connection portion, distal from the first end of the front arm and applied to the hand-held portion.

Preferably, the connection portion of the front arm is defined by a second end of the front arm, opposite the first end of the front arm.

In particular, the connection portion of the front arm is hinged to the handheld rod.

The connection portion of the front arm can be defined by a respective hinge arranged in a fixed position along the hand-held portion and defining a respective oscillation axis perpendicular to the main axis and the auxiliary axis.

Preferably, the connection portion of the front arm has a hinge provided with one or more grooved elastic plugs for defining respective torsional plugs contrasting the rotation of the front arm with respect to the hand-held portion.

Structurally, the hand-held rod can define a seat having a polygonal section, preferably square. The connection portion of the front arm has a pin which also has a polygonal section, preferably square. One or more grooved elastic plugs are placed between the seat and the pin.

Functionally, when the front arm rotates, such one or more elastic plugs store a potential elastic energy which can be transformed into work, generating a mechanical thrust which can be exerted on the front arm in contrast to its rotation with respect to the hand-held portion.

Advantageously, such a technical feature allows to optimize the action of attenuation of the alternating force generated by the drive motor, improving the efficiency of the connection apparatus.

Also, the rear arm has a respective first end constrained to the central portion of the machine body.

According to an example, the first end of the rear arm can be directly constrained to the central portion of the machine body.

According to a further example, the machine body can comprise a rod-like portion coaxial to the main axis, on which at least one rear transverse appendage is stably mounted. In particular, in such an example, the rear transverse appendage is connected to the first end of the rear arm in an eccentric portion with respect to the main axis. Preferably the rear transverse appendage extends away from the main axis in the opposite direction to the hand-held portion and still more preferably is perpendicular to the main axis.

Regardless of the presence or not of the rear transverse appendage, the first end of the rear arm is hinged to the machine body.

Preferably, the first end of the rear arm has a hinge provided with one or more grooved elastic plugs for defining respective torsional plugs contrasting the rotation of the rear arm with respect to the machine body. Structurally, the machine body can define a seat having a polygonal section, preferably square. The first end of the rear arm has a pin which also has a polygonal section, preferably square. One or more grooved elastic plugs are placed between the seat and the pin. Functionally, when the rear arm rotates, such one or more elastic plugs store a potential elastic energy which can be transformed into work, generating a mechanical thrust which can be exerted on the rear arm in contrast to its rotation.

Advantageously, such a technical feature allows to optimize the action of attenuation of the alternating force generated by the drive motor, improving the efficiency of the connection apparatus.

The rear arm also has a respective connection portion, distal from the first end of the rear arm and applied to the hand-held portion. Preferably, the connection portion of the rear arm is defined by a second end of the rear arm, opposite the first end of the rear arm.

In particular, the connection portion of the rear arm is hinged to the handheld rod.

The connection portion of the rear arm can be defined by a respective hinge arranged in a fixed position along the hand-held portion and defining a respective oscillation axis perpendicular to the main axis and the auxiliary axis.

Preferably, the connection portion of the rear arm has a hinge provided with one or more grooved elastic plugs for defining respective torsional plugs contrasting the rotation of the rear arm with respect to the hand-held portion.

Structurally, the hand-held rod can define a seat having a polygonal section, preferably square. The connection portion of the rear arm has a pin which also has a polygonal section, preferably square. One or more grooved elastic plugs are placed between the seat and the pin.

Functionally, when the rear arm rotates, such one or more elastic plugs store a potential elastic energy which can be transformed into work, generating a mechanical thrust which can be exerted on the rear arm in contrast to its rotation with respect to the hand-held portion.

Advantageously, such a technical feature allows to optimize the action of attenuation of the alternating force generated by the drive motor, improving the efficiency of the connection apparatus.

Functionally, in such an embodiment, the kinematic chain defined by the machine body, the hand-held portion and the front and rear arms defines an articulated quadrilateral, preferably flat.

The articulation pins of such an articulated quadrilateral are defined by the hinges of the front arm, respectively with the machine body and with the hand-held portion, and by the hinges of the rear arm, respectively with the machine body and with the hand-held portion.

According to an example, all the hinges are provided with grooved elastic plugs to define respective torsional plugs.

According to an example, only the hinges defined by the front and rear arms with the machine body are provided with grooved elastic plugs to define respective torsional dowels.

According to an example, only the hinges defined by the front and rear arms with the hand-held portion are provided with grooved elastic plugs to define respective torsional plugs.

The aforesaid portable agricultural tool achieves the proposed objects, eliminating the highlighted drawbacks of the prior art.

Further features and advantages of the present invention will become more apparent from the indicative, and therefore non-limiting description of one or more embodiments of a portable agricultural tool.

Such a description will be set out hereinafter with reference to the accompanying drawings given only for illustrative and, therefore, nonlimiting purpose, in which:

- figure 1 is a schematic view of a first embodiment, exemplary and therefore non-limiting, of a portable agricultural tool in accordance with the present invention;

- figure 2 is a sectional view of the embodiment of figure 1 ;

- figure 3 is an exploded view of the embodiment of figure 1 ;

- figure 4 is a schematic view of a second embodiment, exemplary and therefore non-limiting, of a portable agricultural tool in accordance with the present invention;

- figure 5 is a sectional view of the embodiment of figure 4;

- figure 6 is an exploded view of the embodiment of figure 4.

- figure 7 is a schematic view of a further embodiment, exemplary and therefore non-limiting, of a portable agricultural tool in accordance with the present invention;

- figure 8 is a schematic view of a further embodiment, exemplary and therefore non-limiting, of a portable agricultural tool in accordance with the present invention; - figure 9 is a schematic view of a further embodiment, exemplary and therefore non-limiting, of a portable agricultural tool in accordance with the present.

With reference to the accompanying drawings, the reference numeral “1” globally indicates a portable agricultural tool in accordance with the present invention.

Preferably, the portable agricultural tool 1 is a shaker.

The portable agricultural tool 1 comprises a machine body 100, a handheld portion 200 and a connection apparatus 300.

The machine body 100 comprises a central portion 100a extending along a main axis "X".

The machine body 100 further comprises a tool 101 and a drive motor 102 of the tool mounted on opposite sides of the central portion 100a.

The drive motor 102 is configured to generate an alternating force at least along the main axis (X).

Preferably, the tool 101 comprises a vibrating rod 101 a whose operating end is coupled or couplable to a gripping hook, not shown in the accompanying drawings.

The hand-held portion 200 is operatively manually graspable by a user. Such a hand-held portion 200 has a hand-held rod 201 extending along a respective auxiliary axis "Y" parallel to the main axis "X".

Preferably, the hand-held portion 200 comprises handles or other ergonomic portions, not illustrated in the accompanying drawings, which facilitate gripping the hand-held portion itself.

The connection apparatus 300 is interposed between the central portion 100a of the machine body 100 and the hand-held portion 200.

The connection apparatus 300 is configured to connect the machine body 100 in suspension to the hand-held portion 200.

Functionally, moreover, the connection apparatus 300 is configured to attenuate the alternating force transmitted from the drive motor 102 to the hand-held portion 200. Structurally, the connection apparatus 300 comprises a fixing element 301 , a front connection arm 2302, a rear connection arm 303, and an attenuation assembly 304.

The fixing element 301 is operatively and integrally constrained to the hand-held rod 201.

Structurally, the front arm 302 has an arcuate structure. In particular, the front arm 302 has two symmetrical portions which at least partially embrace the machine body 100.

The front arm 302 has a respective first end 302a constrained to the central portion 100a of the machine body 100.

In particular, the machine body 100 comprises a rod-like portion 100b coaxial with the main axis "X", on which a front transverse appendage 104 is stably mounted.

The front transverse appendage 104 is connected to the first end 302a of the front arm 302 in an eccentric portion with respect to the main axis "X". Preferably the front transverse appendage extends away from the main axis "X" in the opposite direction to the hand-held portion 200 and even more preferably is perpendicular to the main axis "X".

The first end 302a of the front arm 302 is hinged to the machine body 100. Preferably, the first end 302a of the front arm 302 has a hinge 302f provided with one or more grooved elastic plugs 105 for defining respective torsional plugs contrasting the rotation of the front arm 302.

Advantageously, such a technical feature allows to optimize the action of attenuation of the alternating force generated by the drive motor 102, improving the efficiency of the connection apparatus 300.

The front arm 302 also has a respective connection portion 302b, distal from the first end 302a of the front arm 302 and applied to the hand-held portion 200.

Specifically, the connection portion 302b of the front arm 302 is defined by a respective hinge 302c arranged in a sliding position along the hand-held portion 200 and defining a respective oscillation axis perpendicular to the main axis "X" and the auxiliary axis "Y".

Structurally, the rear arm 303 has an arcuate structure. In particular, the rear arm 303 has two symmetrical portions which at least partially embrace the machine body 100.

The rear arm 303 has a respective first end 303a constrained to the central portion 100a of the machine body 100. In particular, the first end 303a of the rear arm 303 is hinged to the machine body 100.

In particular, the machine body 100 comprises a rod-like portion 100b coaxial with the main axis "X", on which a rear transverse appendage 106 is stably mounted.

The rear transverse appendage 106 is connected to the first end 303a of the rear arm 303 in an eccentric portion with respect to the main axis "X". Preferably the rear transverse appendage 106 extends away from the main axis "X" in the opposite direction to the hand-held portion 200 and even more preferably is perpendicular to the main axis "X".

Preferably, the first end 303a of the rear arm 303 has a hinge 303f provided with one or more grooved elastic plugs 105 for defining respective torsional plugs contrasting the rotation of the rear arm 303.

Advantageously, such a technical feature allows to optimize the action of attenuation of the alternating force generated by the drive motor 102, improving the efficiency of the connection apparatus 300.

The rear arm 303 also has a respective connection portion 303b, distal from the first end 303a of the rear arm 303 and applied to the hand-held portion 200.

Specifically, the connection portion 303b of the rear arm 303 is defined by a hinge 303c arranged in a respective sliding position along the hand-held portion 200 and defining a respective oscillation axis perpendicular to the main axis "X" and the auxiliary axis "Y".

The connection portion 302b of the front arm 302 and the connection portion 303b of the rear arm 303 are arranged on opposite sides of the fixing element 301. The attenuation assembly 304 is configured to attenuate the alternating force transmitted from the drive motor 102 to the hand-held portion 200.

The attenuation assembly 304 comprises at least one elastic element 304a (or, depending on the needs of the moment, also two or more elastic elements, as illustrated in the accompanying drawings in which a front elastic element 304a and a rear elastic element 304b are seen).

In particular, in the embodiment illustrated in the accompanying drawings, the front elastic element 304a is interposed between the front arm 302 and the fixing element 301 while the rear elastic element 304b is interposed between the rear arm 303 and the fixing element 301 .

However, where the invention in_for the presence of only one elastic element, this can be active and/or interposed between the front arm 302 and the fixing element 301 (or can also be active and/or interposed between the fixing element 301 and the rear arm 303), but depending on the needs of the moment can also be positioned and/or keyed externally with respect to the gap between the front arm 302 and the rear arm 303 (e.g., the single elastic element can be placed in front of the front arm 302 or rear arm 303).

Still more generally, where the needs of the moment include the presence of two or more elastic elements, one of them can be interposed "internally" between the front arm 302 and the rear arm 303, or both can be positioned externally to the gap between the front arm 302 and the rear arm 303 (or again, one of the two elastic elements can be interposed between the front arm 302 and the rear arm 303 while the other can be placed externally to the "internal" space between the front arm 302 and the rear arm 303, always keeping in a keyed condition along the "Y" axis of the hand-held rod 201 or in any case being keyed on an "auxiliary" work axis "Z" substantially parallel to the hand-held rod 201 but offset with respect to the extension axis of the hand-held rod 201 itself, as will be exemplified below).

As can be seen in the figures, the front elastic element 304a and the rear elastic element 304b lie aligned on an attenuation axis "Z" parallel to the main axis "X" and are opposite with respect to the fixing element 301 .

In terms of the positioning and working axes of the elastic elements functionally comprised in the attenuation assembly 304, it can be observed, also with reference to the various embodiments indicated above, that one or more elastic elements can work positioned and/or keyed on the axis "Y" defined by the hand-held rod 201 or on an axis "Z" parallel to this axis "Y": this implies that the axis "Y" and the axis "Z" can be coincident or can be spatially offset (while maintaining a relationship of mutual parallelism).

Figures 1 , 2 and 3 illustrate, by way of example, a preferred embodiment of the connection apparatus 300.

In such an embodiment, the front elastic element 304a is interposed between the connection portion 302b of the front arm 302 and the fixing element 301 while the rear elastic element 304b is interposed between the connection portion 302b of the rear arm 303 and the fixing element 301 .

The front and rear elastic elements 304a, 304b are coaxial with each other and arranged around the auxiliary axis "Y", in particular they are arranged coaxially to the auxiliary axis "Y".

The front and rear elastic elements 304a, 304b comprise tubular bellows elements 305 and/or elastic plugs.

Structurally, the front and rear arms 302, 303 have respective thrust surfaces 302d, 303d arranged in contact with the respective front or rear elastic element 303b, 304b.

Such thrust surfaces 302d, 303d are configured to determine a compression of the elastic element 304a, 304b following the rotation of the arm 302, 303, preferably to determine a same compression of the elastic element 304a, 304b following opposite rotation of the arm 302, 303 with respect to a reference position.

Preferably, the front elastic element 304a and the rear elastic element 304b are in a pre-tensioning or pre-compression state. Preferably, furthermore, the fixing element 301 can be configured to change a value of the pre-tensioning state or the pre-compression state of the front elastic element 304a and/or the rear elastic element 304b.

Structurally, in such an embodiment, the fixing element 301 has two attachment flanges 301 a, 301 b whose distance is adjustable by means of respective threaded members 301 c.

Figures 4, 5 and 6 illustrate, by way of non-limiting example, a further embodiment of the connection apparatus 300.

In such an embodiment, the front elastic element 304a is interposed between a central portion of the front arm 302 and the fixing element 301 and where the rear elastic element 304b is interposed between a central portion of the rear arm 303 and the fixing element 301 , preferably so that the elastic elements 304a, 304b operate along an attenuation axis "Z" which is parallel and offset with respect to said auxiliary axis "Y".

The front and rear elastic elements 304a, 304b are made in the form of arms in deformable material 306, preferably elastomeric.

Still more preferably, the deformable material arms 306 are directly connected at a first end thereof to the respective front arm 302 or rear arm 303 and at the other end to a corresponding portion of the fixing element 301.

Preferably, moreover, the front elastic element 304a and the rear elastic element 304b are both in a pre-tensioning state.

Preferably, in such an embodiment, the fixing element 301 can be at least partially made of an elastically deformable material so that it can deform under the action of the alternating force generated by the drive motor 102 and cooperate with the front elastic element 304a and with the rear elastic element 304b so as to attenuate the aforesaid alternating force transmitted to the hand-held portion 200.

Figure 7 illustrates, by way of non-limiting example, a further embodiment of the connection apparatus 300.

Preferably, in such an embodiment, the attenuation axis "Z" coincides with the auxiliary axis "Y".

Preferably, moreover, the front elastic element 304a and the rear elastic element 304b are both in a pre-tensioning state.

In such an embodiment, the connection apparatus 300 comprises a first fixing element 301a and a second fixing element 301 b.

The front elastic element 304a is interposed between the front arm 302 and the first fixing element 301a while the rear elastic element 304b is interposed between the rear arm 303 and the second fixing element 301 b. Figure 8 illustrates, by way of non-limiting example, a further embodiment of the connection apparatus 300.

Preferably, in such an embodiment, the attenuation axis "Z" coincides with the auxiliary axis "Y".

Preferably, moreover, the front elastic element 304a and the rear elastic element 304b are both in a pre-tensioning state.

In such an embodiment, the connection apparatus 300 comprises a first fixing element 301a and a second fixing element 301 b.

The front elastic element 304a is interposed between the front arm 302 and the first fixing element 301a while the rear elastic element 304b is interposed between the front arm 302 and the second fixing element 301 b. Figure 9 illustrates, by way of non-limiting example, a further embodiment of the connection apparatus 300.

Preferably, in such an embodiment, the attenuation axis "Z" coincides with the auxiliary axis "Y".

Preferably, moreover, the front elastic element 304a and the rear elastic element 304b are both in a pre-tensioning state.

In such an embodiment, the connection apparatus 300 comprises a first fixing element 301a and a second fixing element 301 b.

The front elastic element 304a is interposed between the rear arm 303 and the first fixing element 301a while the rear elastic element 304b is interposed between the rear arm 303 and the second fixing element 301 b. The present invention achieves the proposed objects, eliminating the drawbacks highlighted by the prior art: in this regard, it should be noted first of all that the portable agricultural tool 1 as described and/or claimed ensures optimal conditions of comfort and well-being to the operator during the steps of use of the portable agricultural tool 1. In fact, the peculiar structure of the connection apparatus 300 allows to effectively attenuate the alternating force generated by the drive motor 102 and transmitted to the hand-held portion 200.

It should also be noted that the portable agricultural tool 1 is extremely efficient since, thanks to the possibility of effectively attenuating the alternating force transmitted to the hand-held portion 200, it is possible to increase the alternating force itself, minimizing, if not cancelling, the possible damage to the operator.