Impact wrench

Abstract

Impact wrench (1) having an overall shape of a ‘T’ and comprising an upper handle group (2), a lower working group (3) and an intermediate connecting rod (4) connected between the handle group (2) and the working group (3), wherein: - the handle group (2) comprises a first body (2') with two elongated handles (5, 6) extending in opposite directions to each other and transversely to a longitudinal direction (14) of the screwdriver (1), a manual actuating element (7) and a battery seat (8) for receiving an electric battery (9), - the working group (3) comprises a second body (3'), a tool holder shaft (10) rotatably mounted about a pivot axis (R) and capable of carrying a screw bushing, an electric motor (11) powered by the battery (9) and operable by the manual actuating element (7), a gearbox (12) and an impact mechanism (13) connected between the motor (11) and the tool holder shaft (10) to impart rotational and impact impulses, where: - the battery seat (8) consists of a cavity (34) formed in an outer surface of the first body (2') on an operator side (33) of the impact wrench (1), wherein the cavity (34) is open to the outside of the first body (2') on the operator side (33) and on a top surface (35) of the impact wrench (1) opposite the working group (3), - the cavity (34) accommodates the battery (9) over at least half of its thickness (37), measured in the direction of the operator side (33), and / or the battery (9) extends beyond the free ends of the handles (5, 6) in the direction of the operator side (33) by less than one third or less than one quarter of the thickness of the battery (37), measured in the direction of the operator side (33).

Description

[0001] The present invention relates to a portable impact wrench with an electric motor and battery, in particular for tightening and loosening screws and nuts on / from rails and sleepers during the construction and maintenance of railway lines. The present invention specifically relates to a so-called "T-type" wrench, which consists of an upper handle assembly, a lower working assembly (screw assembly), and an intermediate connecting tube that links the handle assembly to the working assembly. "T-type" wrenches allow the operator to perform tightening and loosening operations while standing upright and holding the wrench in an upright position to carry out work at ground level.

[0002] The aforementioned tasks are physically demanding and repetitive, requiring postures that can quickly tire the operator's muscles. The tightening and loosening of screws is accompanied by significant noise and mechanical vibrations caused by the impact mechanism, the reduction mechanism, and the frictional interaction of bolts, nuts, and screws with the components being tightened or loosened. Furthermore, using the screwdriver in harsh environments exposes it not only to intense mechanical stress but also to moisture, dripping and splashing water, dust, gravel, and metal dust, which are unavoidable near railway tracks or in other construction site applications.

[0003] The noise and vibrations, combined with the weight of the screwdriver, create strenuous conditions for the operator that have not yet been satisfactorily resolved.

[0004] Furthermore, mechanical vibrations and exposure to dust and moisture contribute to the deterioration of the screwdriver's mechanical and electrical / electronic components. Attempts to improve shock absorption in the connection areas between the handle unit and the screwdriver's working unit have yielded only partial results due to the presence of undamped "bridges" created by the anti-rotation, axial, and transverse coupling connections between the screwdriver's assemblies.

[0005] The heating of the motor and the electrical power board of the screwdriver must be limited by forced ventilation to prevent overheating of the motor and the electrical / electronic components. However, this same forced ventilation tends to draw dust, moisture, and water droplets into the screwdriver housing, increasing the risk of damage to the electrical and electronic components.

[0006] The direct coupling of the battery to the screwdriver should ideally be in a position and manner that allows for easy insertion and removal of the battery, but does not cause any anti-ergonomic stresses or imbalances during use of the screwdriver.

[0007] In the current design, batteries located on the side of the screwdriver facing away from the operator are awkward to insert and remove, but they do not create any anti-ergonomic obstructions in the space between the screwdriver and the operator. Batteries located on the side of the screwdriver facing the operator are easier to insert and remove from the battery compartment, but they create a space between the screwdriver and the operator that forces the operator to use the screwdriver at a greater distance from their center of gravity, straining the arms, shoulders, and back. Positioning the battery on one side of the screwdriver would not cause any ergonomic problems, but it would make inserting and removing the battery from the screwdriver more difficult and would make the screwdriver asymmetrically unbalanced with respect to an alignment plane between the operator and the screwdriver.

[0008] From the perspective of the initial production and maintenance of the “T-type” screwdrivers, the wiring between the handle unit and the working unit through the intermediate connecting tube and the subsequent access to the wiring is time-consuming.

[0009] The purpose of the present invention is therefore to provide an improved impact wrench which has features that overcome at least some of the disadvantages mentioned with reference to the known technology.

[0010] This objective is achieved by an impact wrench, in particular of the "T-type" as defined in claim 1. The dependent claims relate to preferred and advantageous embodiments.

[0011] To better understand the invention and appreciate its advantages, some non-limiting embodiments are described below, which refer to the accompanying figures, in which: The Fig. 1 and Fig. Figure 2 shows perspective views of an impact wrench according to one embodiment; The Fig. 5, Fig. 6, Fig. 7, Fig. 8 are front views (side facing away from the operator, Fig. ), Rear views (side facing the operator, Fig. ) and side views ( Fig. ) an upper group of the handle of the screwdriver according to one embodiment; Fig. 9 is a longitudinal sectional view of the screwdriver according to one embodiment; Fig. Figure 10 is a perspective view of the handle assembly of the screwdriver, in which a battery seat with the battery removed according to one embodiment is visible; Fig. Figure 11 is a perspective exploded view of the handle assembly of the screwdriver according to one embodiment; Fig. Figure 12 is a perspective exploded view of a connecting rod of the screwdriver according to one embodiment; Fig. 13 is a perspective exploded view of a lower working group of the screwdriver according to one embodiment; The Fig. 14A, Fig. 14B, Fig. Figures 14C show a ventilation and cooling system of the working unit of the screwdriver according to one embodiment. Description of screwdriver 1

[0012] Referring to the figures, a screwdriver 1 comprises an overall structure in the shape of a “T” with an (upper) handle group 2, a (lower) working group 3 and a (middle) connecting rod 4, which is connected between the handle group 2 and the working group 3.

[0013] The handle group 2 comprises a first body 2' with two handles 5, 6, which are elongated and extend in opposite directions and transversely to the longitudinal direction 14 of the screwdriver to form a handle. The handle group 2 also includes a manual actuating element 7 and a battery seat 8 for (reversibly) accommodating an (electric, rechargeable) battery 9.

[0014] The working group 3 comprises a second body 3', a tool holder shaft 10 which is rotatably mounted about a rotary axis R and can carry a bushing or similar tools to grip the nuts or heads of the screws to be tightened or loosened.

[0015] Working group 3 also includes an electric motor 11, e.g., a brushless electric motor, which is powered by the battery 9 and is capable of generating the kinetic energy, in particular the rotary motion, required for the screwing / loosening operations. The motor 11 can be actuated and controlled via the manual actuating element 7, for example, a push button or a trigger.

[0016] Working group 3 further comprises a gearbox 12 and a striking mechanism 13, which are arranged between the motor 11 and the tool carrier shaft 10, in order to transmit the rotary motion (by converting the angular velocity and the torque) from the motor 11 to the tool carrier shaft 10, in order to rotate the latter about the axis of rotation R and to generate impact impulses.

[0017] The assembly consisting of motor 11, gearbox 12 and impact mechanism 13 runs essentially along the axis of rotation R, advantageously parallel to the longitudinal direction 14 of the screwdriver 1.

[0018] The connecting rod 4 comprises a third tubular body 4' with a first end section 15 coupled to a first coupling seat 16 of the first body 2', and a second end section 17 coupled to a second coupling seat 18 of the second body 3'. The third body 4' forms an inner channel 19 for extending the electrical cables 20 between the handle unit 2 and the working unit 3. Description of the coupling and damping system

[0019] According to one aspect of the invention, the first end section 15 forms one or more first anti-extraction stages 21 extending in a direction transverse to the longitudinal direction 14, for example around the third body 4', and the first coupling seat 16 forms one or more first anti-extraction counter-stages 22 extending in a direction transverse to the longitudinal direction 14, for example around the first coupling seat 16. The first anti-extraction stages 21 and the first anti-extraction counter-stages 22 are shaped complementarily to create a tight connection in the longitudinal direction 14 and simultaneously provide a gap that accommodates a first damping group 24 (damping layer) between the first end section 15 and the first coupling seat 16.

[0020] The first damping group 24 can be made of elastomeric material, for example nitrile rubber (NBR), and can be a single body or a multi-part body.

[0021] The first damping group 24 forms (preferably also in an undeformed state): one or more first folds 25 extending in a direction transverse to the longitudinal direction 14, for example extending completely around the first damping group 24 and completely around the first end section 15 or completely around the first coupling seat 16 and having a complementary shape with the shape of the first anti-extraction stages 21 and with the shape of the first anti-extraction counter-stages 22.

[0022] Similarly, the second end section 17 forms one or more second anti-extraction stages 26 extending in a direction transverse to the longitudinal direction 14, for example around the third body 4', and the second coupling seat 18 forms one or more second anti-extraction counter-stages 27 extending in a direction transverse to the longitudinal direction 14, for example around the second coupling seat 18. The second anti-extraction stages 26 and the second anti-extraction counter-stages 27 are shaped complementarily to create a tight connection in the longitudinal direction 14 and simultaneously provide a gap that accommodates a second damping group 29 (damping layer) between the second end section 17 and the second coupling seat 18.

[0023] The second damping group 29 can be made of elastomeric material, for example nitrile rubber (NBR), and can be a single body or a multi-part body.

[0024] The second damping group 29 forms (preferably also in an undeformed state): - one or more second folds 30 extending in a direction transverse to the longitudinal direction 14, for example, extending completely around the second damping group 29 and completely around the second end section 17 or completely around the second coupling seat 18 and having a complementary shape with the shape of the second anti-extraction stages 26 and with the shape of the second anti-extraction counter-stages 27.

[0025] This configuration of coupling and damping between the connecting rod 4 and the first body 2' and / or the second body 3' ensures a reliable mechanical bond in the longitudinal direction 14 and continuous, uninterrupted vibration isolation throughout the entire coupling area.

[0026] According to one embodiment, the first anti-extraction stages 21, the first anti-extraction counter-stages 22 and the first folds 25 form a plurality of, for example, two or three annular grooves and projections (not necessarily circular, but possibly also polygonal) which advantageously extend in planes that are orthogonal to the longitudinal direction 14 ( Fig. 12). This ensures a very uniform coupling stiffness and vibration isolation around the first end sections 15 of the third body 4'.

[0027] Similarly, the second anti-extraction stages 26, the second anti-extraction counter-stages 27 and the second folds 30 form a plurality of, for example, two or three annular grooves and projections (not necessarily circular, but possibly also polygonal) which advantageously extend in planes that are orthogonal to the longitudinal direction 14 ( Fig. 12). This ensures coupling stiffness and very uniform vibration isolation around the second end sections 17 of the third body 4'.

[0028] According to one embodiment, the first damping group 24 (and / or similarly the second damping group 29) comprises two first damping half-shells 24', 24" (and / or similarly second damping half-shells 29', 29"), preferably of identical and symmetrical shape with respect to a joint and separation plane between them, which is preferably a radial plane to the longitudinal direction 14.

[0029] This allows for easier positioning of the damping groups 24, 29 in the space between the end sections 15, 17 of the connecting rod 4 and the coupling seats 16, 18 of the handle group 2 and the working group 3, thus avoiding the need to mount the damping groups 24, 29 on the connecting rod 4 against the resistance of the anti-extraction stages 21, 26.

[0030] Advantageously, the first coupling seat 16 (and / or similarly the second coupling seat 18) also comprises two first half-shells 16', 16" (and / or similarly second half-shells 18', 18"), preferably of identical and symmetrical shape with respect to a buttress and separation plane between them, which is preferably a radial plane to the longitudinal direction 14.

[0031] This makes it possible to apply the first half-shells 16', 16" of the first coupling seat 16 (and / or similarly the second half-shells 18', 18" of the second coupling seat 18) from two opposite sides to the first end section 15 (and / or similarly to the second end section 17) of the connecting rod 4 (and to the respective damping group 24, 29), thereby avoiding the need for longitudinal insertion against the resistance of the anti-extraction stages 21, 26.

[0032] During assembly, the two half-shells of the first damping group 24 and / or the second damping group 29 are each applied from two opposite sides to the first and / or second end section 15, 17 of the connecting rod 4, and the two half-shells of the first coupling seat 16 and / or the second coupling seat 18 are applied from two opposite sides and each closed around the first damping group 24 and / or the second damping group 29.

[0033] According to a further, independent, aspect of the invention, but also synergistically in combination with the other described aspects, the first end section 15 and the first coupling seat 16 both have a non-circular cross-section (orthogonal to the longitudinal direction 14), preferably polygonal, for example rectangular or square, possibly with rounded corners, to create a rotationally fixed connection between them, wherein a first damping group (24) is inserted, which forms a damping layer between the first end section (15) and the first coupling seat (16). This advantageously eliminates the need for anti-rotation pins, which in known technology are inserted into transverse bores of the components to be coupled and thus form undesirable vibration bridges between them.Furthermore, the non-circular shape of the first damping group 24 and the damping layer formed by it provides isolation and damping of the rotational vibrations generated by the tangential / rotating impacts carried out by the impact mechanism 13.

[0034] With a further advantage, the first damping group 24 (also in undeformed configuration) also has a non-circular cross-sectional shape (orthogonal to the longitudinal direction 14), which is complementary to the cross-sectional shapes of the first end section 15 and the first coupling seat 16.

[0035] Similarly, the second end section 17 and the second coupling seat 18 both have a non-circular cross-section (orthogonal to the longitudinal direction 14), preferably polygonal, for example rectangular or square, possibly with rounded corners, to create a rotationally fixed connection between them, with a second damping group (29) being inserted which forms a damping layer between the second end section (17) and the second coupling seat (18). This advantageously avoids the need to use anti-rotation pins, which in known techniques are inserted into transverse holes in the components to be coupled and thus form undesirable vibration bridges between them.In this case too, the non-circular shape of the second damping group 29 and the damping layer it forms provides isolation and damping of the rotational vibrations generated by the tangential / rotational impacts carried out by the impact mechanism 13.

[0036] With a further assembly and functional advantage, the second damping group 29 (also in undeformed configuration) also has a non-circular cross-sectional shape (orthogonal to the longitudinal direction 14), which is complementary to the cross-sectional shapes of the second end section 17 and the second coupling seat 18.

[0037] For the purpose of effectively damping and isolating the vibrations of the screwdriver 1, taking into account the different inertial masses of the handle group 2 and the working group 3 as well as the difference in the distance of the coupling areas from the places of vibration generation (gearbox 12, impact mechanism 13 and motor 11), it is advantageous to realize the first damping group 24 and the second damping group 29 with different shapes and sizes, for example with a number of first folds 25 that differs from the number of second folds 30, and / or with a spacing of the first folds 25 that differs from a spacing of the second folds 30. Description of connecting rod 4

[0038] According to one embodiment, the third body 4' of the connecting rod 4 consists of a polymer material reinforced with fibers, for example glass fibers, thereby reducing the weight of the screwdriver 1 compared to the prior art, in which the connecting rod is a metal tube.

[0039] The third body 4' comprises two half-shells 4'', 4''' in the form of an open channel, both extending over the entire longitudinal extent of the third body 4'. These half-shells can be reversibly brought close together along a butt plane, corresponding, for example, to a radial plane in the longitudinal direction 14, and locked together by means of connecting screws. This allows the half-shells 4'', 4''' of the third body 4' to be applied to the electrical power cables 20 from two opposite sides during assembly at the factory and closed around the cables 20 without interrupting the continuity of the cables 20 themselves. The proposed configuration also allows quick access to the cables during maintenance work by simply removing the two half-shells 4', 4''' of the third body 4' laterally.

[0040] Advantageously, the connecting rod 4 forms one or more transport handle areas 31 made of plastic (for example, elastomer or soft polymer and / or non-slip surface, for example, made of a different material than the fiber-reinforced material of the third body 4'), for example, molded onto the third body 4' by injection molding, preferably on two diametrically opposite sides of the third body 4'.

[0041] According to one embodiment, the one or more transport handle areas 31 are designed in a position that is not centered with respect to the longitudinal extension of the connecting rod 4, but closer to the working group 3 (which is heavier) than to the handle group 2 and therefore close to the center of gravity of the screwdriver 1.

[0042] To avoid assembly errors of the connecting rod 4, the first end section 15 has a shape that is not compatible with the shape of the second coupling seat 18, and the second end section 17 has a shape that is not compatible with the shape of the first coupling seat 16.

[0043] According to one embodiment, the third body 4' forms a cylindrical outer surface, at least in accordance with one or more carrying handle areas 31, which facilitates the transport and manual handling of the screwdriver 1. The change in the cross-section of the third body 4' between the carrying handle areas 31 and the end sections can be easily achieved by injection molding the half-shells 4'', 4''' from fiber-reinforced plastic material. Description of grip group 2

[0044] According to one embodiment, the first body 2' comprises two half-shells 2'', 2''' made of plastic, preferably reinforced with fibers (for example, glass), which are connected to each other by connecting screws to form a hollow body which can be more easily optimized (by suitable reinforcing ribs and hollow areas for lightening) for greater lightness and mechanical strength compared to a single body.

[0045] Advantageously, each of the two half-shells 2'', 2''' of the first body 2 forms one of the two first half-shells 16', 16'' of the first coupling seat 16.

[0046] With the added advantage of cost-effective manufacturing and weight minimization, both handles 5, 6 are hollow and each consists of two half-shells 5', 5''; 6', 6'' which are joined together, and each of the two half-shells 2'', 2''' of the first body 2 forms one of the two half-shells 5', 5''; 6', 6'' of each of the two handles 5, 6 ( Fig. 6).

[0047] The first body 2' accommodates, in addition to the manual actuating element 7, a direction switch 32, for example a three-stage switch for selecting the screwing in and unscrewing direction as well as the screw lock.

[0048] According to an (independent, but also synergistic) aspect of the invention, the handles 5, 6 are not aligned along a straight line and have a mirrored and symmetrical position and orientation with respect to a radial plane in the longitudinal direction 14, with a first inclination towards the working group 3 and with a second inclination towards an operator side 33 of the screwdriver 1. This configuration of the handles 5, 6 creates a particularly ergonomic handlebar structure that reduces fatigue in the arms and shoulders of the operator and allows a reduction in the horizontal distance between the operator's hands and the operator's center of gravity / back during use of the screwdriver 1, even when the battery 9 is located on the same operator side 33 of the screwdriver.

[0049] According to one embodiment, the battery seat 8 consists of a cavity 34 formed in an outer surface of the first body 2' on the operator side 33. The cavity 34 is open to the outside of the first body 2' on the operator side 33 and on a top surface 35 of the screwdriver 1 opposite the working unit 3.

[0050] Advantageously, the cavity 34 accommodates the battery 9 for at least half of its thickness 37, measured in the direction of the operator side 33.

[0051] Another advantage is that the battery 9 extends beyond the free ends of the handles 5, 6 towards the operator side 33 by less than one third, preferably less than one quarter, of the battery thickness 37, measured towards the operator side 33.

[0052] According to one embodiment, the handle assembly 2 includes a battery interface 36 for mechanical coupling and electrical connection to the battery 9, which is first disconnected and then connected to the first body 2' at the battery seat 8. In this way, the screwdriver 1 can be configured during manufacturing to accommodate different electrical batteries by mounting different battery interfaces 36. Description of Working Group 3

[0053] According to one embodiment, the second body 3' comprises two half-shells 3'', 3''' made of plastic, preferably reinforced with fibers (for example, glass), which are connected to each other by connecting screws to form a hollow body which can be more easily optimized (by suitable reinforcing ribs and hollow areas for lightening) for greater lightness and mechanical strength compared to a single body.

[0054] Advantageously, each of the two half-shells 3'', 3''' of the second body 3 forms one of the two second half-shells 18', 18'' of the second coupling seat 18.

[0055] The second body 3' accommodates an electrical control board 38, which is connected / resin-bonded to a heat sink 39, as well as the electric motor 11. The positioning of the electrical control board 38 in the same second body 3' in which the motor 11 is also housed (as opposed to the positioning of the same control board in the handle assembly in the previous technique) allows for simpler and more direct wiring and a synergistic configuration of the cooling system for both the motor components and the electrical board.

[0056] The second body 3' accommodates a lighting device 40, for example two lights, for example LEDs, which are directed towards one end of the tool carrier shaft 10 and are positioned in diametrically opposite positions and preferably in different longitudinal positions (along the longitudinal direction 14). The lighting device 40 is controlled by the electrical control board 38 depending on the actuation of the manual actuating element 7 and / or the direction switch 32.

[0057] According to one embodiment, the second body 3' also houses a display 41 with a selection keypad, which is attached directly to the electrical control board 38 and allows selection of the torque and / or speed of tightening / loosening. Positioning the display 41 on the second body 3' instead of the handle assembly 2 also allows the display and push-button panel to be arranged directly on the electrical control board 38, saving on wiring and electrical connections.

[0058] According to one embodiment, the gearbox 12 and the impact mechanism 13 can be housed in a separate metal housing 42, which is screwed to the second body 3'. Description of the cooling system

[0059] According to another independent aspect of the invention, but in synergy with the other described aspects, the second body 3' forms:

[0060] a first cooling channel 43, which extends in the following order: - from one or more first inlet openings 44, - along the heat sink 39 of the electrical circuit board 38, - through or along the electric motor 11, - along a cooling fan 45 of the electric motor 11, - and finally through one or more exit openings 46,

[0061] wherein the cooling fan 45 generates a first cooling flow 47 along the first cooling channel 43 to cool the electrical control board 38,

[0062] as well as a second cooling channel 48, which extends in the following order: - from one or more second inlet openings 49, which are different from and located away from the first inlet opening 44, - through or along the electric motor 11, but without first touching the heat sink 39 of the electrical control board 38, - along the cooling fan 45 of the electric motor 11, - and finally through one or more outlet openings 46,

[0063] wherein the cooling fan 45 generates a second cooling flow 50 along the second cooling channel 48 to cool the electric motor 11.

[0064] The cooling configuration with two different cooling flows reconciles the cooling requirements of the heat-sensitive components with the need to protect sensitive components from moisture and dust that are drawn in from the working area of ​​the screwdriver 1. Reference symbol: 1 screwdriver 2 (upper) grip group 2' First body 2'', 2''' Half-shells of the first body 2' 3 (lower) working group 3' second body 3'', 3''' Half-shells of the second body 3' 4 (Intermediate) connecting rods 4' third body 4'', 4''' Hemispheres of the third body 5, 6 steps 7 Manual operating element 8 Battery seat 9 Battery 10 Tool carrier shaft R axis of rotation 11 Electric motor 12 Gearboxes or reduction gearboxes 13 Striking mechanism 14 Longitudinal direction 15 first final section 16 first coupling seat 16', 16'' first half-shells of the first coupling seat 17 second final section 18 second coupling seat 18', 18'' second half-shells of the second coupling seat 19 internal channel 20 Electrical cables 21 first anti-extraction stages 22-23 first anti-extraction antagonists 24 first damping group 24', 24'' first shock-absorbing half-shells 25 first wrinkles 26 second anti-extraction stages 27-28 second anti-extraction antagonists 29 second damping group 29', 29'' second shock-absorbing half-shells 30 Second Folds 31 transport handle areas 32 directional switches 33 Operator side 34 Cavity for battery seat 35 Top 36 Battery interface 37 Battery thickness 38 Electrical control board 39 heat sinks 40 Lighting device 41 Display 42 metal cases 43 first cooling channel 44 first entry openings 45 cooling fans 46 outlet openings 47 first cooling stream 48 second cooling channel 49 second entrance openings 50 second cooling stream

Claims

[1] Impact wrench (1) having an overall shape of a ‘T’ and comprising an upper handle group (2), a lower working group (3) and an intermediate connecting rod (4) connected between the handle group (2) and the working group (3), wherein: - the handle group (2) comprises a first body (2') with two elongated handles (5, 6) extending in opposite directions to each other and transversely to a longitudinal direction (14) of the screwdriver (1), a manual actuating element (7) and a battery seat (8) for receiving an electric battery (9), - the working group (3) comprises a second body (3'), a tool holder shaft (10) rotatably mounted about a pivot axis (R) and capable of carrying a screw bushing, an electric motor (11) powered by the battery (9) and actuated by the manual actuating element (7), a gearbox (12) and an impact mechanism (13) connected between the motor (11) and the tool holder shaft (10) to impart rotational and impact impulses, where: - the battery seat (8) consists of a cavity (34) formed in an outer surface of the first body (2') on an operator side (33) of the impact wrench (1), wherein the cavity (34) is open to the outside of the first body (2') on the operator side (33) and on a top surface (35) of the impact wrench (1) opposite the working group (3), - the cavity (34) accommodates the battery (9) over at least half of its thickness (37), measured in the direction of the operator side (33), and / or the battery (9) extends beyond the free ends of the handles (5, 6) in the direction of the operator side (33) by less than one third or less than one quarter of the thickness of the battery (37), measured in the direction of the operator side (33). [2] Impact wrench (1) according to claim 1, wherein the handle assembly (2) comprises a battery interface (36) for mechanical coupling and electrical connection with the battery (9), wherein the battery interface (36) is manufactured separately from the first body (2') on the battery seat (8) and is subsequently connected to it. [3] Impact wrench (1) according to claim 1 or 2, wherein the connecting rod (4) comprises a third tubular body (4') with a first end section (15) coupled to a first coupling seat (16) of the first body (2') and a second end section (17) coupled to a second coupling seat (18) of the second body (3'), where: A) the first end section (15) and the first coupling seat (16) both have a cross-section that is orthogonal to the longitudinal direction (14), that is not circular, or that is polygonal, rectangular or square, in order to create a connection with an anti-rotation device with the interposition of a first damping group (24) forming a damping layer between the first end section (15) and the first coupling seat (16), and / or B) the second end section (17) and the second coupling seat (18) both have a cross-section that is orthogonal to the longitudinal direction (14), which is not circular, or which is polygonal, rectangular or square to provide a connection with an anti-rotation feature, wherein a second damping group (29) is inserted which forms a damping layer between the second end section (17) and the second coupling seat (18). [4] Impact wrench (1) according to claim 3, comprising feature A) and wherein the first damping group (24) also has a non-circular cross-sectional shape in the non-deformed configuration, which is complementary to the cross-sectional shapes of the first end section (15) and the first coupling seat (16). [5] Impact wrench (1) according to claim 3 or 4, comprising feature B) and wherein the second damping group (29) also has a non-circular cross-sectional shape in its undeformed configuration, which is complementary to the cross-sectional shapes of the second end section (17) and the second coupling seat (18). [6] Impact wrench (1) according to any one of claims 3 to 5, wherein A1) the first end section (15) forms one or more first anti-extraction stages (21) extending in a direction transverse to the longitudinal direction (14), and the first coupling seat (16) forms one or more first anti-extraction counter-stages (22) extending in a direction transverse to the longitudinal direction (14), and the first anti-extraction stages (21) and the first anti-extraction counter-stages (22) have a complementary shape to form a tight connection in the longitudinal direction (14), and with a gap that accommodates a first damping group (24) forming a damping layer between the first end section (15) and the first coupling seat (16), and / or B1) the second end section (17) forms one or more second anti-extraction stages (26) extending in a direction transverse to the longitudinal direction (14), and the second coupling seat (18) forms one or more second anti-extraction counter-stages (27) extending in a direction transverse to the longitudinal direction (14), and the second anti-extraction stages (26) and the second anti-extraction counter-stages (27) have a complementary shape to form an integral connection in the longitudinal direction (14), and with a space that accommodates a second damping group (29) forming a damping layer between the second end section (17) and the second coupling seat (18). [7] Impact wrench (1) according to claim 6, comprising feature A1) and wherein the first anti-extraction stages (21) extend around the third body (4') and the first anti-extraction counter-stages (22) extend around the first coupling seat (16). [8] Impact wrench (1) according to claim 6 or 7, comprising feature A1) and in which the first damping group (24) also forms one or more first folds (25) in an undeformed state, which extend in a direction transverse to the longitudinal direction (14) and have a complementary shape with the shape of the first anti-extraction stage (21) and with the shape of the first anti-extraction counter stage (22). [9] Impact wrench (1) according to claim 8, wherein the first folds (25) extend: - all around the first damping unit (24) and - all around the first end section (15) or all around the first coupling seat (16). [10] Impact wrench (1) according to claim 8, wherein the first anti-extraction stages (21), the first anti-extraction counter-stages (22) and the first folds (25) form a plurality of annular grooves and projections extending in planes that are orthogonal to the longitudinal direction (14). [11] Impact wrench (1) according to any one of claims 3 to 10, comprising feature B1) and wherein the second anti-extraction stages (26) extend around the third body (4') and the second anti-extraction counter-stages (27) extend around the second coupling seat (18). [12] Impact wrench (1) according to one of claims 3 to 11, comprising feature B1) and wherein the second damping group (29) also forms one or more second folds (30) in an undeformed state, which extend in a direction transverse to the longitudinal direction (14) and have a complementary shape with the shape of the second anti-extraction stages (26) and with the shape of the second anti-extraction counter-stages (27). [13] Impact wrench (1) according to claim 12, wherein the second folds (30) extend: - all around the second damping unit (29) and - completely around the second end section (17) or completely around the second coupling seat (18). [14] Impact wrench (1) according to claim 12, wherein the second anti-extraction stages (26), the second anti-extraction counter-stages (27) and the second folds (30) form a plurality of annular grooves and projections extending in planes that are orthogonal to the longitudinal direction (14). [15] Impact wrench (1) according to any one of claims 3 to 14, with feature A) and in which the first damping group (24) comprises two first damping half-shells (24', 24''), and / or comprising feature B) and in which the second damping group (29) comprises two second damping half-shells (29', 29''). [16] Impact wrench (1) according to any one of claims 3 to 11, including feature A) and wherein the first damping group (24) comprises two first damping half-shells (24', 24'') of identical shape, which are positioned symmetrically with respect to a buttress and separation plane between them, which is a radial plane to the longitudinal direction (14), and / or comprising feature B), and in which the second damping group (29) comprises two second damping half-shells (29', 29'') of identical shape, which are positioned symmetrically with respect to a collision and separation plane between them, which is a radial plane to the longitudinal direction (14). [17] Impact wrench (1) according to any one of claims 3 to 16, wherein the first coupling seat (16) comprises two first half-shells (16', 16'') and the second coupling seat (18) comprises two second half-shells (18', 18''). [18] Impact wrench (1) according to any one of claims 3 to 17, including feature A) and feature B), wherein the first damping group (24) and the second damping group (29) have different shapes and sizes. [19] Impact wrench (1) according to one of the preceding claims, wherein the connecting rod (4) comprises a third tubular body (4') and wherein the third body (4') is made of fiber-reinforced polymer material and comprises two half-shells (4'', 4'''') in the form of an open channel, both of which extend over the entire length of the third body (4') and can be reversibly brought close together and locked together by means of connecting screws. [20] Impact wrench (1) according to claim 19, wherein the connecting rod (4) forms one or more transport handle areas (31) made of synthetic material which is different from the fiber-reinforced material of the third body (4') and is molded onto the third body (4') by injection molding. [21] Impact wrench (1) according to claim 3 and claim 20, wherein the center of gravity of the impact wrench (1) is closer to the working group (3) than to the handle group (2) and the transport handle areas (31) are on two diametrically opposite sides of the third body (4') and in positions that are not centered with respect to the longitudinal extent of the connecting rod (4) but are closer to the working group (3) than to the handle group (2), wherein the first end section (15) has a shape that is not compatible with the shape of the second coupling seat (18) and the second end section (17) has a shape that is not compatible with the shape of the first coupling seat (16). [22] Impact wrench (1) according to claim 17, wherein the first body (2') comprises two plastic half-shells (2'', 2'''') connected to each other by connecting screws to form a hollow body, each of the two half-shells (2'', 2'''') of the first body (2) forming one of two first half-shells (16', 16'') of the first coupling seat (16). [23] Impact wrench (1) according to claim 22, wherein both handles (5, 6) are hollow and each consists of two interconnected half-shells (5', 5''; 6', 6''), and each of the two half-shells (2'', 2'''') of the first body (2) forms one of the two half-shells (5', 5''; 6', 6'') of each of the two handles (5, 6). [24] Impact wrench (1) according to one of the preceding claims, wherein the handles (5, 6) have a mirrored and symmetrical position and orientation with respect to a radial plane to the longitudinal direction (14) and are inclined towards the working group (3) and towards an operator side (33) of the impact wrench (1). [25] Impact wrench (1) according to claim 17, wherein the second body (3') comprises two plastic half-shells (3'', 3'''') connected to each other by connecting screws to form a hollow body, each of the two half-shells (3'', 3'''') of the second body (3) forming one of the two second half-shells (18', 18'') of the second coupling seat (18). [26] Impact wrench (1) according to one of the preceding claims, wherein the second body (3') accommodates an electrical control board (38) with a heat sink (39), the electric motor (11) and a lighting device (40). [27] Impact wrench (1) according to claim 26, wherein the lighting device (40) comprises two lights or LEDs directed towards one end of the tool carrier shaft (10) and positioned in diametrically opposite positions and in different longitudinal positions along the longitudinal direction (14), wherein the lighting device (40) is controlled by the electrical control board (38) depending on the actuation of the manual actuating element (7) and / or a direction switch (32) of the impact wrench (1). [28] Impact wrench (1) according to claim 26, wherein the second body (3') also accommodates a display (41) with a selection push-button panel, which is positioned directly on the electrical control board (38) and allows selection of the torque and / or speed of screwing / loosening. [29] Impact wrench (1) according to claim 26, wherein the second body (3') forms a first cooling channel (43) extending in the following sequence: - from one or more first inlet openings (44), - along the heat sink (39) of the electrical control board (38), - through or along the electric motor (11), - along a cooling fan (45) of the electric motor (11), - and finally through one or more outlet openings (46), wherein the cooling fan (45) generates a first cooling flow (47) along the first cooling channel (43) to cool the electrical control board (38), wherein the second body (3') forms a second cooling channel (48) which extends in the following sequence: - from one or more second inlet openings (49) that are different from and located away from the first inlet opening (44), - through or along the electric motor (11), but without first touching the heat sink (39) of the electrical control board (38), - along the cooling fan (45) of the electric motor (11), - and finally through one or more outlet openings (46), wherein the cooling fan (45) generates a second cooling flow (50) along the second cooling channel (48) to cool the electric motor (11).

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