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A hand-held powered ground and soil cultivation device includes a handle, a first end of which includes a holding zone and/or a holding member for the user, and the opposite end of which includes a head to which a working tool is rotationally or pivotally attached. During operation of the device, th

A hand-held powered ground and soil cultivation device includes a handle, a first end of which includes a holding zone and/or a holding member for the user, and the opposite end of which includes a head to which a working tool is rotationally or pivotally attached. During operation of the device, the working tool performs a reciprocating oscillating movement along a portion of a rotation and about a predetermined central angular position under the effect of the movement transmitted by a drive unit including at least an electric actuator or a heat engine. The hand-held powered device is characterized in that the working tool is releasably attached to the head, the working tool being mounted on a drive shaft that performs a reciprocating oscillating rotational movement and forms a vertical or horizontal axis of oscillation for the tool. The central angular position of the working tool can be adjusted.

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1. A handheld motor-driven soil and ground cultivation device (1), comprising: a handle (2) that comprises, at a first end (3), a gripping zone and/or at least one gripping element suitable for a user, and,at an opposite second end (4), a head (6) comprising a housing and a drive device (5) with a d

1. A handheld motor-driven soil and ground cultivation device (1), comprising: a handle (2) that comprises, at a first end (3), a gripping zone and/or at least one gripping element suitable for a user, and,at an opposite second end (4), a head (6) comprising a housing and a drive device (5) with a drive shaft (8),wherein a work tool (7) is rigidly attached, by a single fastening point, to the head (6) at the drive shaft (8) of the drive device (5) to rotate about an axis of rotation of the drive shaft (8) such that, when the device (1) is used, the work tool (7) is driven with a reciprocating oscillating rotational movement transmitted by the drive device (5) along a portion of rotation and around a specified middle angular position under the action of the reciprocating oscillating rotational movement,wherein the work tool (7) is connected removably to the drive shaft (8) of the drive device (5), and is configured to be driven by the reciprocating oscillating rotational movement to oscillate along a vertical or horizontal axis of oscillation of the work tool (7),wherein the middle angular position of said work tool (7) with respect to the drive shaft (8) is adjustable,wherein the drive device (5) comprises one of an electric actuator or a heat engine,wherein the work tool (7) is mounted laterally, or on one side of, said head (6),wherein the work tool (7) is mounted on a projecting part (8′) of the drive shaft (8), said projecting part (8′) projecting outside of the housing of the head (6), andwherein the work tool (7) is mounted to the projecting part (8′) by means of an intermediate part (11) that is directly and rigidly attached at a first end to the drive shaft (8) and directly attached at an opposite second end to the work tool (7). 2. The device according to claim 1, wherein the work tool (7) is positioned in a symmetrical way in relation to a longitudinal axis (X) of the handle (2), after mounting and fastening on the head (6). 3. The device according to claim 1, wherein the head (6) is attached to the handle (2) by a fastening means that allows a mounting with locking in position of said head (6) in at least two angular positions that are mutually offset around a longitudinal axis (X) of said handle (2). 4. The device according to claim 1, wherein the drive device is incorporated into the head (6). 5. The device according to claim 1, wherein the drive device (5) is an electric actuator of the rotating motor type, having a reduction gear and a system (5′) for transmitting and converting movement so as to drive the drive shaft (8) in a reciprocating oscillating rotational movement. 6. The device according to claim 1, wherein the drive device is an electric motor (5), a continuous rotational movement thereof directly converted, by a system (5′) for converting movement of the drive shaft (8), into the reciprocating oscillating rotational movement. 7. The device according to claim 1, wherein the drive device (5) is an electric actuator that is supplied by an independent power source (1′) configured to be carried by the user and which is part of the handheld motor-driven device (1). 8. The device according to claim 1, wherein the work tool (7) is attached, with several middle angular positions, to the projecting part (8′) of the drive shaft (8), and is configured to be fastened in an indexed position, located within a range of angular positions, around the drive shaft (8) and defining the middle angular position. 9. The device according to claim 8, wherein a range of the angular positions comprises corresponding indexed positions, such that for a given inclination of the handle (2) in relation to the ground, at the middle angular positions, the work tool (7) exhibits a movement of advance or of independent and automatic progress, associated with an inversely proportional penetration of the work tool (7) into the soil. 10. The device according to claim 1, wherein the work tool (7) comprises a single fastening bracket (9) configured to be rigidly attached to the intermediate part (11). 11. The device according to claim 1, wherein the body of the intermediate part (11) comprises two parts (12, 12′) comprising a first U-shaped part (12) incorporating an open ring with inner notching or toothing to engage with a complementary notching or a toothing (8″) present on the projecting part (8′) of the drive shaft (8), and a second part (12′) forming a fastening plate for the bracket (9) of the work tool (7). 12. The device according to claim 11, wherein the intermediate part (11) is secured to the projecting part (8′) of the drive shaft (8) by a fastener (13) extending through the branches of the U extending the open ring of the first part (12) and engaging in a circular groove (14) on the projecting part (8′) of the drive shaft (8), andwherein the second part (12′) forming a plate exhibits an indentation (12″) to receive the bracket (9) of the work tool (7) in a clamped way, the engagement with fitting of said bracket (9) in said indentation (12″) being locked. 13. The device according to claim 1, wherein the projecting part (8′) of the drive shaft (8) is equipped with a plate or with a dial (15) comprising an angular graduation (16), andwherein the intermediate part (11) or the work tool (7) is provided with an indexing mark (17), located face-to-face with said angular graduation (16) in a mounted position of said intermediate part (11), with or without the tool (7). 14. The device according to claim 1, wherein the middle angular position of the work tool (7) is adjustable in such a way that in a position of use, said tool (7) makes an approximately symmetrical pendular movement around the vertical in relation to the soil. 15. The device according to claim 1, wherein the work tool (7) has a closed loop shape, equipped with a bracket (9) for fastening to the drive shaft (8). 16. The device according to claim 15, wherein the work tool (7) is made of a single band of material, whose ends are joined to form the fastening bracket (9). 17. The device according to claim 15, wherein the work tool (7) has a closed loop shape, with an approximately rectangular general shape, of which a first portion (10), which is approximately flat and parallel to the soil during use of the device (1), is sharp and equipped with teeth, and of which two second portions (10′), which extend on both sides of the first portion (10) and which extend into a plane that is approximately perpendicular to the soil during use, are sharp. 18. The device according to claim 1, wherein the first end (3) of the handle (2) is provided with a portion (2′) that incorporates an electronic card for control of the electric actuator (5), connected to elements for control and selection of speeds. 19. The device according to claim 7, wherein the independent power source (1′) is comprised of a rechargeable electric battery of the Li-Ion or Li-Polymer type. 20. The device according to claim 1, wherein the work tool (7) oscillates at a frequency of between 10 and 25 Hz. 21. The device according to claim 19, wherein the independent power source (1′) is configured to be carried by the user by means of a harness. 22. A handheld motor-driven soil and ground cultivation device (1), comprising: a handle (2) that comprises, at a first end (3), a gripping zone and/or at least one gripping element suitable for a user, and,at an opposite second end (4), a head (6) comprising a housing and a drive device (5) with a drive shaft (8),wherein a work tool (7) is rigidly attached, by a single fastening point, to the head (6) at the drive shaft (8) of the drive device (5) to rotate about an axis of rotation of the drive shaft (8) such that, when the device (1) is used, the work tool (7) is driven with a reciprocating oscillating rotational movement transmitted by the drive device (5) along a portion of rotation and around a specified middle angular position under the action of the reciprocating oscillating rotational movement,wherein the work tool (7) is connected removably to the drive shaft (8) of the drive device (5), and is configured to be driven by the reciprocating oscillating rotational movement oscillate along a vertical or horizontal axis of oscillation of the work tool (7),wherein the middle angular position of said work tool (7) with respect to the drive shaft (8) is adjustable,wherein the drive device (5) comprises one of an electric actuator or a heat engine,wherein the work tool (7) is mounted laterally, or on one side of, said head (6), andwherein the work tool (7) is positioned in a symmetrical way in relation to the longitudinal axis (X) of the handle (2), after mounting and fastening on the head (6). 23. A handheld motor-driven soil and ground cultivation device (1), comprising: a handle (2) that comprises, at a first end (3), a gripping zone and/or at least one gripping element suitable for a user, and,at an opposite second end (4), a head (6) comprising a housing and a drive device (5) with a drive shaft (8),wherein a work tool (7) is rigidly attached, by a single fastening point, to the head (6) at the drive shaft (8) of the drive device (5) to rotate about an axis of rotation of the drive shaft (8) such that, when the device (1) is used, the work tool (7) is driven with a reciprocating oscillating rotational movement transmitted by the drive device (5) along a portion of rotation and around a specified middle angular position under the action of the reciprocating oscillating rotational movement,wherein the work tool (7) is connected removably to the drive shaft (8) of the drive device (5), and is configured to be driven by the reciprocating oscillating rotational movement oscillate along a vertical or horizontal axis of oscillation of the work tool (7),wherein the middle angular position of said work tool (7) with respect to the drive shaft (8) is adjustable,wherein the drive device (5) comprises one of an electric actuator or a heat engine,wherein the work tool (7) is mounted laterally, or on one side of, said head (6),wherein the work tool (7) is mounted on a projecting part (8′) of the drive shaft (8), said projecting part (8′) projecting outside of the housing of the head (6), andwherein the drive device is an electric motor (5), a continuous rotational movement thereof directly converted, by a system (5′) for converting movement of the drive shaft (8), into the reciprocating oscillating rotational movement. 24. A handheld motor-driven soil and ground cultivation device (1), comprising: a handle (2) that comprises, at a first end (3), a gripping zone and/or at least one gripping element suitable for a user, and,at an opposite second end (4), a head (6) comprising a housing and a drive device (5) with a drive shaft (8),wherein a work tool (7) is rigidly attached, by a single fastening point, to the head (6) at the drive shaft (8) of the drive device (5) to rotate about an axis of rotation of the drive shaft (8) such that, when the device (1) is used, the work tool (7) is driven with a reciprocating oscillating rotational movement transmitted by the drive device (5) along a portion of rotation and around a specified middle angular position under the action of the reciprocating oscillating rotational movement,wherein the work tool (7) is connected removably to the drive shaft (8) of the drive device (5), and is configured to be driven by the reciprocating oscillating rotational movement oscillate along a vertical or horizontal axis of oscillation of the work tool (7),wherein the middle angular position of said work tool (7) with respect to the drive shaft (8) is adjustable,wherein the drive device (5) comprises one of an electric actuator or a heat engine,wherein the work tool (7) is mounted laterally, or on one side of, said head (6),wherein the work tool (7) is attached to a projecting part (8′) of the drive shaft (8) by a connecting part (11′) of the work tool (7) that has a connection site provided with an inner notching or a toothing and configured to engage axially with meshing on a complementary notching or a toothing (8″) present on the projecting part (8′), the connecting part (11′) being locked to the projecting part (8′) by fasteners. 25. The device according to claim 24, wherein the work tool (7) is comprised of a claw or a fork with multiple teeth configured to oscillate around the axis of the drive shaft (8), positioned vertically during the use of said device (1), said tool (7) being configured to exhibit a non-perpendicular arrangement in relation to a longitudinal axis of the handle (2) in a middle angular position, according to the adjustment of the handle (2).