Screwdriving tool

Abstract

The invention relates to a screwdriving tool comprising a transverse handle (1) and a shank (2). A freewheel mechanism having electrically conductive components (25, 35) is accommodated in a cavity (3) of the handle. A cavity wall (3') is made of a plastic material and is sealed in a materially bonded and insulating manner to the edge (6') of a closure part (6) such that the screwdriving tool can be used to work on on electrically conductive workpieces.

Description

Description of screwdriving tools in the field of technology

[0001] Die Erfindung betrifft ein Schraubwerkzeug mit einem Griff und einem Shaft. The handle has a cavity. A section of the cavity forms a receiving chamber. At least the receiving chamber is made of an insulating material. Inside the receiving chamber is a gearbox housing with a freewheel mechanism. The freewheel mechanism allows torque applied to the handle to be transmitted to the shaft. The free end of the shaft may have a drive profile that can be inserted into a socket.

[0002] Die Erfindung betrifft darüber hinaus ein Verfahren zur Fertigung eines such a screwdriving tool. State of the art

[0003] Ein derartiges Werkzeug ist beispielsweise aus der DE 202018101989 U1 This screwdriver is well-known. It has a handle encased in an insulating sheath and plastic operating elements. A shaft protruding from the head of the handle is also encased in plastic, allowing the tool to be used on live electrical workpieces.

[0004] Die EP 3192615 A1 und die DE 202016101550 U1 beschreiben jeweils einsimilar screw tool in which a handle insulation forms an electrically insulating locking part. 31305PCT – 13.10.2025

[0005] Die DE 7836483 U1 offenbart ein Schraubwerkzeug mit einem Quergriff and a plastic casing, the two halves of which are joined together by ultrasonic welding.

[0006] Ein Freilaufgetriebe, wie es in dem zuvor genannten Schraubwerkzeug The method of use is described in detail in WO 2017 / 129402 A1.

[0007] Ein Schraubwerkzeug mit einem Quergriff wird in der DE 102018113481 A1 described. Such screwdriving tools can also have a freewheel mechanism. Summary of the invention

[0008] Der Erfindung liegt die Aufgabe zugrunde, ein Werkzeug, mit dem an to improve manufacturing and safety-related processes, particularly for working on electrically charged workpieces, and for rotating nuts or screws that are under electrical voltage.

[0009] Gelöst wird die Aufgabe durch die in den Ansprüchen angegebene Er- invention, wherein the dependent claims not only represent advantageous further developments of the invention specified in the dependent claims, but are also independent solutions to the problem.

[0010] Bei dem erfindungsgemäßen Schraubwerkzeug weist das Verschlussteila rim that is connected to an electrically insulating area of ​​the cavity in which the freewheel mechanism is housed. Preferably, a circumferential rim of the closure element follows the contour of the receiving chamber wall and is bonded to the receiving chamber wall in a material-bonded and insulating manner. The closure element can form the bottom of a blind opening in which 31305PCT – 13.10.2025 The head of the actuating element is movably mounted. The area occupied by the locking element can be larger than the cross-sectional area of ​​the receiving chamber that houses the freewheel mechanism. The locking element electrically seals an opening in the receiving chamber. This is achieved by forming a connection zone between an edge of the locking element and an edge of the receiving chamber, in which the locking element is materially bonded and insulated to the receiving chamber. Preferably, this is a homogeneous connection created without the use of an adhesive or other bonding agent. A method is preferably used to produce this connection, creating a direct bond between the materials of the parts to be joined.For example, the surface sections that are in contact with each other in the connection zone can be brought to a temperature at which the material of the wall of the receiving chamber and the material of the closure part melt and fuse together. This is preferably done by laser welding or ultrasonic welding.

[0011] Gemäß einer bevorzugten Ausgestaltung wird die AufnahmekammerThe device is made of plastic, or at least the wall of the receiving chamber and an end face, hereinafter referred to as the step, are made of plastic, in particular the same or a similar plastic, from which a connecting zone of the closure part is also made, hereinafter referred to as the rim. The step may be located within the cavity and spaced from an opening edge of the cavity in the direction of the cavity's depth. The rim of the closure part is placed on this step, so that a fully enclosed surface of the underside of the closure part rests on the fully enclosed rim. Upon application of energy, the contacting surfaces of the rim and the step bond together in such a way that, during use of the screw tool and under fluctuating temperatures, the connection is electrically insulating. 31305PCT – 13.10.2025 The materially bonded connection reliably prevents the passage of substances such as moisture from the cavity into the receiving chamber containing the freewheel mechanism, which has electrically conductive components connected to an electrically conductive output part, such as a core of the shaft.

[0012] Von der zur Griffoberfläche offenen Höhlung können ein oder meh-Several actuating elements project into the receiving chamber. These actuating elements are designed, for example, to switch the direction of the freewheel mechanism or to actuate a detent element arranged on the output part of the shaft, for example, a detent ball as described in DE 202018101989 U1. It is specifically provided that one or more sleeves project from an outer surface of the closure part facing the opening edge of the cavity, and that these sleeves are connected to a plate formed by the closure part in a single material configuration. Actuating elements made of an electrically insulating material, for example, plastic, are inserted into these sleeves and are movable relative to the sleeve, for example, axially movable, or rotatable.It may further be provided that at least one sleeve projects from an inner side of the closure part, pointing away from the opening edge, and that this sleeve is materially bonded to the plate of the closure part. An actuating element, made of an insulating material, for example plastic, and movable relative to the sleeve, may also be inserted into this sleeve. In particular, it is provided that the sleeve has a cavity with a circular cross-section in which a cylindrical section of the actuating element is arranged, the outer wall of the actuating element being only a small distance from the inner wall of the cavity, so that the passage of liquid through this annular gap is inhibited. It is also provided that the actuating element and the sleeve form a labyrinth seal. It may further be provided that… 31305PCT – 13.10.2025 The sleeve projecting from the inside of the locking element engages in a cavity of a core within a shaft made of electrically conductive material. This core can be designed as a tube. A push button shaft, made of plastic, can be inserted into the cavity of the outwardly projecting sleeve. This outer sleeve can be arranged coaxially with the inner sleeve. It can have a larger diameter than the inner sleeve, allowing a first end of a compression spring to rest on the base of the outer sleeve. The second end of this compression spring is connected at a coupling point to a rod located in the cavity of the core. The rod is preferably a push rod for actuating the locking mechanism described above, which engages a nut with a drive face of the shaft. The locking position can be released by pressing the push button.The inner sleeve preferably has a smaller diameter, only slightly larger than the diameter of the shaft inserted into it. A transmission shaft, which is associated with a switching element made of an insulating material, can be mounted in a further sleeve projecting from the outer surface. The operating states of the freewheel mechanism can be changed by pivoting the transmission shaft. For example, the freewheel mechanism can be moved from a left-locking operating position to a right-locking operating position or to a neutral position. In the left-locking operating position, for example, a clockwise torque can be transmitted. In the neutral position, a torque can be transmitted in both directions of rotation. In the right-locking operating position, a counterclockwise torque can be transmitted.The switching body can additionally have a cuff which has an inner surface that rests against the outer surface of the sleeve, so that a labyrinth seal is formed. 31305PCT – 13.10.2025

[0013] In einer Weiterbildung der Erfindung kann vorgesehen sein, dass dieThe cavity is closed by a cap. The cap can be made of an insulating material, for example, plastic. The cap covers the sleeves projecting from the outside of the closure part. A space can extend between a cover surface of the cap and a section of the closure part formed by a plate, into which the sleeves can project freely. The cap can have a circumferential wall that forms a rim which rests on the edge of the closure part. This can be the same rim that is materially connected to the wall of the receiving chamber in the manner described above. A switching arm of the switching element can protrude from a lateral slot in the cap. A central section of the switching element can lie below the cover surface of the cap. The cap can have an opening in which a push button head is inserted.

[0014] Der rohrförmige Schaft, der bis in einen Zahnkranz des Freilaufgetrie-The handle, which protrudes into the receiving chamber, can be made of steel and is surrounded by an insulating body. This insulating body extends into a further cavity in the handle, which connects to the receiving chamber and through which the tubular core also protrudes. A freely rotatable sleeve, which can also be made of plastic, can be arranged on the shaft. It is particularly intended that the handle is a transverse handle with two radially projecting wings. The receiving chamber and the two cavities, each pointing towards an opening, can be arranged within a core section made of plastic. This core section can be sheathed. The materials of the core section and the sheathing can be different. Preferably, both are plastics. 31305PCT – 13.10.2025

[0015] Die Fertigung eines derartigen Schraubwerkzeugs besitzt zumindest the steps described below, or at least some of the steps described below:

[0016] Es wird ein Griffkörper bereitgestellt. Der Griffkörper besteht zumin-The handle body is preferably made entirely of plastic, preferably a thermoplastic. The handle body can be a transverse handle. It can have two wings projecting from an axis at a 180° angle. A cavity extends along the axis, open on two opposite sides. The cavity has several sections with different cross-sectional areas. A lower section, designed to receive an upper section of a shaft, has the smallest diameter and a circular plan. Adjoining the lower section is a middle section with a larger, non-circular plan. This section is designed to receive a gearbox housing containing a freewheel mechanism.This middle section is followed by an upper section, forming a continuous step, which is open towards the top of the handle.

[0017] In einem darauf folgenden Schritt wird das zuvor genannte Getriebege- The housing, which can be made of plastic or metal and in which at least one core of the shaft can be inserted, is placed into the cavity and positioned in the middle section of the cavity. The gearbox housing is arranged in this section of the cavity in such a way that it cannot rotate relative to the handle. The core protrudes through the lower section of the cavity.

[0018] In einem darauf folgenden Schritt wird das insbesondere aus Kunststoff The manufactured closure part was inserted into the upper section of the cavity, and 31305PCT – 13.10.2025 such that an edge of the closure part rests on the step. The closure part is preferably also made of a thermoplastic.

[0019] In einem darauf folgenden Schritt wird der Rand des Verschlussteilsis subjected to heat in such a way that the material of the edge melts together with the material of the step, creating a particularly homogeneous material bond between the wall of the cavity and the closure part.

[0020] Im Anschluss daran werden der Schaltkörper und der Druckknopf so- The cap is mounted by inserting the switching shaft of the switch body into its corresponding sleeve and the shaft of the push button into its corresponding sleeve. Brief description of the drawings.

[0021] Ausführungsbeispiele der Erfindung werden nachfolgend anhand bei- The attached drawings explain this. They show: Fig. 1 a view of an embodiment, Fig. 2 a top view of the embodiment, Fig. 3 the section along line III-III in Figure 1 or Figure 6, Fig. 4 the section along line IV-IV in Figure 1 or Figure 6, Fig. 5 enlarged, detail V in Figure 4, Fig. 6 the section along line VI-VI in Figure 2 and 31305PCT – 13.10.2025 Fig. 7 the section according to line VII-VII in Figure 6. Description of embodiments

[0022] Die Zeichnungen zeigen ein Schraubwerkzeug, das einen aus Kunst-The handle 1 is made of fabric. It is a transverse handle with two opposing wings, oriented along an axis. The handle 1 has a core part 1' made of plastic, which is encased in another plastic part.

[0023] Aus dem Griff 1 ragt ein Schaft 2 heraus, an dessen Ende sich ein Ab- The drive polygon 20 has a square profile. A detent projection 21, which may be formed by a detent ball, protrudes from a broad side surface of the drive polygon.

[0024] Der Griff 1 besitzt eine Durchgangshöhlung mit im Wesentlichen dreiSections. An uppermost section of the cavity 3, opposite the shaft 2, has the largest cross-sectional area, which is non-circular. The cavity wall 3' of the cavity 3 runs from an opening edge 3'' in a straight line in longitudinal section to a stepped section. The stepped section has two axially offset, circumferential steps 13', 13''. The plan view of this section consists essentially of two circular zones, which are generated by circles of different diameters. The axis runs in the center of the zone with the largest diameter. A switch for the freewheel mechanism is located in the zone with the smaller diameter.

[0025] An den Stufenbereich schließt sich ein mittlerer Abschnitt der Höh- lung 3, which has a cross-sectional area reduced by the width of the two steps 13', 13'' compared to the uppermost section of the cavity 3. This middle section of the cavity 3 forms a receiving chamber 4 for a 31305PCT – 13.10.2025 Freewheel transmission. The receiving chamber 4 has a receiving chamber wall 4' which, in longitudinal section, initially runs in a straight line to a base of the receiving chamber 4. In the base is a recess 31 for receiving a projection 32 of a transmission housing 5, which is inserted into the receiving chamber 4.

[0026] An die Aufnahmekammer 4 schließt sich ein – bezogen auf die Achse – rotationally symmetrical lower section of the cavity 3, into which a sleeve-shaped section 38 of the gearbox housing 5 engages, into which a steel core 16 of the shaft 2 extends, which protrudes from the lower section of the cavity 3 together with a plastic sheathing 19.

[0027] Das aus Kunststoff oder aus Stahl bestehende Getriebegehäuse 5 lagertA gear ring 25, which has teeth 25' and in which the core 16 is positively engaged, is provided. The gear ring 25 may have a polygonal opening in which a polygonal section of the core 16 is inserted. Furthermore, two locking elements 26 with mating teeth are arranged in the gearbox housing 5. Each locking element 26 has a projection 26' that extends into a switching element 28, in which a spring element 27 is located. Depending on the rotation of the switching element 28, the spring element 27 acts on one or both of the locking elements 26, engaging the teeth 25'. The spring element 27 also acts on a detent element 29, designed as a detent ball, in a detent recess 30, 30'. Regarding the function and construction of the freewheeling gear or freewheeling lock, reference is made to WO 2017 / 129402 A1, the full content of which is incorporated into this application.The gearbox housing 5 has a downwardly projecting extension 32 that engages in a recess 31 in the bottom of the receiving chamber 4. The outer wall of the 31305PCT – 13.10.2025. The gearbox housing can be in contact with the receiving chamber wall4'.

[0028] Das Getriebegehäuse 5 ist nach oben hin offen und wird von einemThe locking part 6 is covered. The locking part 6 has a section designed as a plate 10. This is a flat section with a rim 6' that rests on the two steps 13', 13''. The locking part 6 forms a downwardly projecting projection 33 that engages the locking elements. A sleeve 8, which is materially bonded to the locking part 6, also projects from the underside of the plate 10. The sleeve 8 engages in a cavity 16' of the core 16 of the shaft 2. A shaft 12 of a push button 11 is guided within the cavity 8' of the sleeve 8. At a coupling point 14, the plastic shaft 12 is connected to a push rod 15, which can be used to actuate the detent projection 21.

[0029] Von der Oberseite der Platte 10 des Verschlussteils 6 ragt eine ersteSleeve 7 extends coaxially to the previously described sleeve 8. One end of a compression spring 39ab rests on the base 7'' of a cavity 7' of the sleeve 7. The other end of the compression spring 39 engages a head 11' of the push button 11. The push button 11 lies in an opening 23 of a cap 22.

[0030] Von der Oberseite der Platte 10 des Verschlussteiles 6 ragt eine zweite Sleeve 9 extends coaxially to the previously described circular section of the plan. A transmission shaft 36 of a switching element 34 is located in the cavity 9' of the sleeve 9. An upper end of the switching element 34 forms a switching arm 35, which laterally projects through an opening in the cap 22. By pivoting the switching arm 35, the transmission shaft 36 can be rotated. At its other end, the shaft has a switching extension 36' with which the switching element 28 of the freewheel mechanism can be pivoted.

[0031] Der Schaltkörper 34 bildet eine Manschette 37 aus, die die Außenwand the sleeve 9 is covered, so that a labyrinth seal is created.

[0032] Die Kappe 22 besitzt eine Umfangswand 24, die berührend an der Höh-lung wall 3' and has a rim edge 24' which rests on the rim 6' of the closure part 6.

[0033] Der Kern 16 des Schaftes 2 ist von einer drehbaren Hülse 19 umgeben, which may be made of plastic.

[0034] Die beiden Stufen 13‘ und 13‘‘ verlaufen in zueinander parallelen Ebe- To connect the rim 6' to the steps 13', 13'', a process is used in which the rim 6' is subjected to energy such that the adjacent surfaces of the rim 6' and the steps 13', 13'' are heated. The surfaces are heated to such an extent that the material melts. The two melts thus formed flow into one another and create a metallurgical bond zone 13, which is closed over the entire circumference of the rim 6' or the steps 13', 13'', or the cavity wall 3' or the receiving chamber wall 4'. Preferably, the materials of the steps 13', 13'' and the rim 6' are identical, so that a homogeneous metallurgical bond is formed.

[0035] Zur Fertigung dieser Verbindungszone 13 wird eine in den Zeichnun-A sonotrode (not shown) is used, which is set into ultrasonic vibration by a vibration generator (not shown). The cross-section of the sonotrode can correspond to the cross-section of cavity 3, 31305PCT – 13.10.2025 In particular, the cross-section of the upper section of the cavity 3 is shaped so that an edge zone of the sonotrode, which may project from an end face of the sonotrode, can come into contact with the outer surface of the rim 6'. An axial pressure can be applied to the rim 6' with the sonotrode, so that the rim 6' is subjected to pressure against the steps 13', 13''. The energy introduced via ultrasonic vibration melts at least the rim 6' and the steps 13', 13'', so that the two melts mix together and, upon cooling, a homogeneous bond is formed which is highly watertight. The bond between the rim 6' and the steps 13', 13'', or even just one step, can also be created using alternative methods, for example, with the aid of a laser beam that is guided over the rim 6' to melt the rim 6' and the steps, or the single step.

[0036] Die vorstehenden Ausführungen dienen der Erläuterung der von derThe application covers all inventions which further develop the prior art at least independently through the following combinations of features, whereby two, several or all of these combinations of features may also be combined, namely:

[0037] Ein Schraubwerkzeug mit einem Griff 1 und einem Schaft 2, mit einera cavity 3 arranged in the handle 1, which has a receiving chamber 4, wherein a cavity wall 3' of the cavity 3 and a receiving chamber wall 4' of the receiving chamber 4 are made of an insulating material, wherein a freewheel mechanism with electrically conductive components 25, 35 is arranged in the receiving chamber 4, wherein a torque applied to the handle 1 can be transmitted to an electrically conductive core 16 of the shaft 2 by means of the freewheel mechanism, wherein the core 16 is surrounded by an insulating material, wherein an opening of the receiving chamber 4 pointing towards an opening edge 3'' is closed with a closure part 6 made of an insulating material, wherein an edge 6' of the closure part 6 is connected in a material-locking-insulating manner in a connection zone 13 of the receiving chamber 4.

[0038] Ein Schraubwerkzeug, das dadurch gekennzeichnet ist, dass in der Ver- The bonding zone 13 of the edge 6' is connected to a step 13', 13'' by laser welding or by ultrasonic welding.

[0039] Ein Schraubwerkzeug, das dadurch gekennzeichnet ist, dass von einerOn the outer side of the closure part 6, pointing towards the opening edge 3'', one or more sleeves 7, 8 project, which are connected in a single material to a plate 10 formed by the closure part 6, wherein electrically insulating actuating elements 36, 12 are inserted in the sleeves 7, 8, which are movable relative to the sleeve 7, 8.

[0040] Ein Schraubwerkzeug, das dadurch gekennzeichnet ist, dass von einer On the inside of the locking part 6, pointing away from the opening edge 3'', at least a sleeve 8 projects, which is connected to the plate 10 in a single material, in which an electrically insulating actuating element 12 is inserted, which is movable relative to the sleeve 8.

[0041] Ein Schraubwerkzeug, das dadurch gekennzeichnet ist, dass die vonThe inner side of the sleeve 8 projects into a cavity of a tube forming the core 16, and a shaft 12, inserted in the cavity 8' of the sleeve 8 and connected to a push button 11, is connected at a coupling point 14 to a push rod 15 arranged in a cavity 16' of the core 16, the push button 11 having a head 11' on which a compression spring 39 acts, the spring being supported against a base 7'' of a cavity 7' of the sleeve 7 opposite the sleeve 8. 31305PCT – 13.10.2025

[0042] Ein Schraubwerkzeug, das dadurch gekennzeichnet ist, dass in einer a transmission shaft 36 of a switching element 34 made of an insulating material is pivotably mounted on the sleeves 9 projecting from the outside, with which the freewheel gear can be switched between two or three operating positions, wherein the switching element 34 has a cuff 37 surrounding the sleeve 9 at a close distance.

[0043] Ein Schraubwerkzeug, das dadurch gekennzeichnet ist, dass die vonone or more sleeves 7, 9 projecting from the outside into a space formed by the cavity 3, the space being closed by a cap 22 made of an insulating material and in particular having an opening 23 in which the head 11' of the push button 11 is inserted.

[0044] Ein Schraubwerkzeug, das dadurch gekennzeichnet ist, dass der Griff 1 a transverse handle having two wings, which has a core part 1' made of plastic in which the cavity 3 extends, wherein in the connection zone 13 a step 13', 13'' of the core part 1' is arranged.

[0045] Ein Verfahren zur Fertigung eines Schraubwerkzeugs nach einem derpreceding claims, comprising the following method steps: – Providing a handle 1, wherein the handle 1 has a cavity 3 with a cavity wall 3' made of an insulating material and with a section adjoining an opening edge 3'', which has a step 13', 13'' made of plastic, wherein a receiving chamber 4 adjoins the step 13', 13'', wherein a cavity section 18 adjoins the receiving chamber 4, which is open to a side of the handle 1 opposite the opening edge 3''; 31305PCT – 13.10.2025 – Fitting the cavity 3 with a gear housing 5 in which a freewheel gear is arranged and which is connected to a core 16 of a shaft 2; – Inserting a plastic closure part 6 filling the cross-section of the cavity 3, which has a rim 6' that rests on the step 13', 13''; – Generating heat in the area of ​​the rim 6' such that the material of the rim 6' melts with the material of the step 13', 13'' and a material bond, in particular a homogeneous one, is created between the cavity wall 4', the receiving chamber 4 and the closure part 6.

[0046] Ein Verfahren, das dadurch gekennzeichnet ist, dass die Wärme durcha vibrating sonotrode is generated, which is inserted into the section of the cavity 3 extending between the opening edge 3'' and the closure part 6, wherein it is particularly provided that the sonotrode has a plan view that corresponds to the plan view of a section of the closure part 6 having the shape of a plate 10, such that an edge of the sonotrode runs along the connection zone 13.

[0047] Alle offenbarten Merkmale sind (für sich, aber auch in Kombination un-(mutually) essential to the invention. The disclosure of the application hereby also fully incorporates the disclosure content of the associated / attached priority documents (copy of the prior application), also for the purpose of including features of these documents in the claims of the present application. The dependent claims characterize, even without the features of a referenced claim, independent inventive developments of the prior art, in particular to make divisional applications on the basis of these claims. The invention specified in each claim may additionally encompass one or more of the 31305PCT – 13.10.2025 The invention includes features described above, particularly those identified by reference numbers and / or listed in the reference number list. It also relates to designs in which individual features mentioned in the above description are not realized, especially if they are recognizably unnecessary for the intended use or can be replaced by other technically equivalent means. 31305PCT – 13.10.2025 List of reference symbols: 1 Handle 16 Core, tube 1' Core part 16' Cavity 2 Shaft 17 Insulator body 3 Cavity 18 Cavity section 3' Cavity wall 19 Rotating sleeve 3'' Opening edge 20 Output polygon 4 Receiving chamber 21 Detent projection 4' Receiving chamber wall 22 Cap 5 Gear housing 23 Opening 5' Housing wall 24 Circumferential wall 6 Locking part 24' Edge 6' Edge 25 Toothed ring 7 Sleeve 25' Toothing 7' Cavity 26 Locking element 7'' Bottom 26' Extension 8 Sleeve 27 Spring element 8' Cavity 28 Switching element 9 Sleeve 29 Detent element 9' Cavity 30 Detent recess 10 Plate 30' Detent recess 11 Push button 31 Recess 11' Head 32 Extension 12 Shaft 33 Projection 13 Connecting zone 34 Switching body 13' Step 35 Switching arm 13'' Step 36 Transmission shaft 14 Coupling point 36' Shift extension 15 Push rod 37 Cuff 31305PCT – 13.10.2025 Sleeve-shaped section Compression spring 31305PCT – 13.10.2025

Claims

Claims 1. A screwdriver with a handle (1) and a shaft (2), wherein the handle (1) has a first cavity (3) with a receiving chamber (4) in which a freewheel mechanism with electrically conductive components (25, 35) is arranged, by which a torque applied to the handle (1) can be transmitted to a core (16) of the shaft (2), and with an actuating element (11, 22) that can be actuated from an outer side of the handle and that acts on the freewheel mechanism or the electrically conductive shaft (2), and with a closing part (6) made of an insulating material that closes the receiving chamber (4) and has a cavity (7, 9) through which a transmission element (12, 36) of the actuating element (11, 22) projects to the freewheel mechanism or to the shaft (2), characterized in that a receiving chamber wall (4') of the receiving chamber (4) has a has insulating material1. The screw tool is spaced apart in the direction of the depth of the cavity (3) from an opening edge (3'') of the cavity and forms a connection zone (13) in which an edge (6') of the closure part (6) is materially bonded and insulatingly connected to the receiving chamber wall (4').

2. Screw tool according to claim 1, characterized in that in the connection zone (13) the edge (6') is connected to a step (13', 13'') by laser welding or by ultrasonic welding.

3. Screw tool according to any one of the preceding claims, characterized in that one or more sleeves (7, 8) project from an outer surface of the closure part (6) pointing towards the opening edge (3''), which are materially bonded to a plate (10) formed by the closure part (6), 31305PCT – 13.10.2025, wherein the at least one electrically insulating actuating element (36, 12) is inserted in the at least one sleeve (7, 8) and is movable relative to the sleeve (7, 8).

4. Screwing tool according to one of the preceding claims, characterized in that at least one sleeve (8) projects from an inner side of the locking part (6) facing away from the opening edge (3''), the sleeve being materially connected to the locking part, in which an electrically insulating actuating element (12) is inserted and is movable relative to the sleeve (8). 5.Screw tool according to claim 4, characterized in that the sleeve (8) projecting from the inside engages in a cavity of a tube forming the core (16) and a shaft (12) inserted in the cavity (8') of the sleeve (8), which is connected to a push button (11), is connected at a coupling point (14) to a push rod (15) arranged in a cavity (16') of the core (16), wherein the push button (11) has a head (11') on which a compression spring (39) acts, which is supported on a bottom (7'') of a cavity (7') of the sleeve (7) opposite the sleeve (8).A screw-driving tool according to one of claims 3 to 5, characterized in that a transmission shaft (36) of a switching element (34) made of an insulating material is pivotably mounted in one of the sleeves (9) projecting from the outside, with which the freewheel mechanism can be switched between two or three operating positions, wherein the switching element (34) has a sleeve (37) surrounding the sleeve (9) at a close distance. 31305PCT – 13.10.2025.

7. Screwdriver according to any one of claims 3 to 6, characterized in that the one or more sleeves (7, 9) projecting from the outside extend into a space formed by the cavity (3), the space being closed by a cap (22) made of an insulating material and in particular having an opening (23) in which the head (11') of the push button (11) is inserted.

8. Screwdriver according to any one of the preceding claims, characterized in that the handle (1) is a transverse handle having two wings, which has a core part (1') made of plastic in which the cavity (3) extends, wherein a step (13', 13'') of the core part (1') is arranged in the connection zone (13). 9.A method for manufacturing a screw tool according to one of the preceding claims, comprising the following process steps: – Providing a handle (1), wherein the handle (1) has a cavity (3) with a cavity wall (3') made of an insulating material and with a section adjoining an opening edge (3'') which has a step (13', 13'') made of plastic, wherein a receiving chamber (4) adjoins the step (13', 13''), wherein a cavity section (18) adjoins the receiving chamber (4) which is open to a side of the handle (1) opposite the opening edge (3''); – Fitting the cavity (3) with a gear housing (5) in which a freewheel gear is arranged and which is connected to a core (16) of a shaft (2); –Insertion of a plastic closure part (6) filling the cross-section of the cavity (3) and having a rim (6') that rests on the step (13', 13''); 31305PCT – 13.10.2025 – Generating heat in the region of the edge (6') such that the material of the edge (6') fuses with the material of the step (13', 13'') and a material bond, in particular a homogeneous one, is created between the cavity wall (4'), the receiving chamber (4) and the closure part (6).

10. Method according to claim 9, characterized in that the heat is generated by a vibrating sonotrode which is introduced into the section of the cavity (3) extending between the opening edge (3'') and the closure part (6), wherein it is particularly provided that the sonotrode has a plan view which corresponds to the plan view of a section of the closure part (6) having the shape of a plate (10), such that an edge of the sonotrode runs along the connection zone (13).

11. Screwdriving tool or method characterized by one or more of the distinguishing features of any of the preceding claims. 31305PCT – 13.10.2025.

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