Screw driving device

Abstract

A screw head bushing (2) for a screw (1), where the screw head bushing (2) has an outer section (3) and an inner section (4) following the outer section (3), where the outer section (3) has a larger diameter (D) than the inner section (4), and the outer section (3) is substantially configured as a truncated cone narrowing towards the inner section (4), and the inner section (4) is designed as an engagement geometry for rotationally fixed receiving of the screw head drive (6). Wherein the engagement geometry is a linear geometry passing through the screw head bushing (2) on a second axis (A2), which is different from the first axis (A1), in a normal direction to the depth (T) of the screw head bushing (2).

Description

[0001] This application is a divisional application of Chinese invention patent application 202080088932.X, filed on December 17, 2020, and named “Screw drive device”. Technical Field

[0002] The present invention relates to a screw head bushing for a screw according to the preamble of claim 1, a screw head driving device according to the preamble of claim 4, a forming tool for forming a screw head bushing according to the preamble of claim 7, a screw according to the preamble of claim 10, and a kit comprising a screw and a screw head driving device. Background Art

[0003] The screw head bushing is a geometric structure formed in the screw head and used to accommodate the screw head drive in a rotationally fixed manner. The screw head drive can transmit torque to the screw, thereby screwing the screw into or out of the material. In the prior art, a series of geometric structures for screw head drives and screw head bushings are known, such as cross, flat or Torx geometries. This geometry is often called a screw drive. Geometries such as the Torx geometry are optimized to transmit high torques from the screw head drive to the screw head bushing.

[0004] A disadvantage of many screw drives is that, in the case of an insufficiently centered alignment of the screw head drive relative to the screw head bushing or in the case of an oblique alignment, only an insufficiently positive fit is established between the screw head drive and the screw head bushing, so that the screw head drive can slip in the screw head bushing. The screw head bushing and / or the screw head drive can thus be damaged, so that the torque required for screwing in or out the screw equipped with the screw head drive can no longer be transmitted. This has the result that the screw in question can no longer be screwed in or can no longer be removed from the material by simple tools, so that the workpiece into which the screw is screwed is damaged or its function can be negatively affected.

[0005] A TTAP screw drive is known in the prior art and disclosed in US Pat. No. 6,951,158 B1, which is a geometric structure for improving the alignment of a screw head drive in a screw head bushing. The screw head bushing of the TTAP screw drive comprises an outer section and an inner section, wherein the inner section comprises a centering cone. This enables the screw head drive to be centrally aligned in the screw head bushing. Summary of the invention

[0006] The object of the present invention is to provide an alternative geometry for a screw drive which ensures a high degree of torque transmission and also enables centering of the screw head drive in the screw head bushing.

[0007] The solution of the present invention to achieve the above-mentioned purpose lies in a screw head bushing having the features of claim 1, a screw head drive device having the features of claim 4, a forming tool for forming a screw head bushing having the features of claim 7, a screw having the features of claim 11, and a kit including a screw and a screw head drive device having the features of claim 14.

[0008] An embodiment of the invention of a screw head bushing for a screw comprises an outer section and an inner section following the outer section. The outer section has a larger diameter than the inner section on at least one first axis normal to the depth of the screw head bushing and is substantially configured as a truncated cone that narrows toward the inner section. The inner section is configured as an engagement geometry for accommodating a screw head drive in a rotationally fixed manner. A guide for the screw head drive is provided through the conically narrowed outer section, thereby preventing the screw head drive from being inserted obliquely into the screw head bushing. In addition, the inner section implemented as an engagement geometry is located behind the outer section or at a greater depth than the outer section, thereby ensuring that the screw head drive is aligned in a centered manner through the outer section before the screw head drive is engaged in the engagement geometry. This prevents the engagement geometry from being worn out due to improper insertion of the screw head drive.

[0009] Preferably, the outer section comprises a truncated cone surface which is inclined by 2.5° to 10° relative to the cylindrical surface. The following advantage is achieved thereby: the obliquely attached screw head drive can be centrally aligned without requiring a large amount of force.

[0010] According to a preferred embodiment, the screw head bushing of the invention further comprises an insertion region with an insertion surface arranged between the outer section and the inner section, wherein the insertion surface has an inclination of approximately 10° relative to the base surface of the truncated cone of the outer section. As a result, the engagement geometry of the screw head drive can be more easily slid into the engagement geometry of the screw head bushing.

[0011] The engagement geometry of the screw head bushing according to the invention is preferably a cross (Philipps) geometry, a Torx geometry or a straight geometry. Particularly preferably, the engagement geometry is a straight geometry that passes through the screw head bushing on a second axis that is different from the first axis and is normal to the depth of the screw head bushing. This achieves the following advantage: several different screw drive geometries can be used within the scope of the invention.

[0012] According to an embodiment of the invention, the screw head drive comprises an outer section and an inner section following the outer section, wherein the inner section has a larger diameter than the outer section on at least one first axis normal to the height of the screw head drive. The inner section is substantially designed as a truncated cone that tapers toward the outer section, and the outer section comprises an engagement geometry that is designed to engage in a rotationally fixed manner into an engagement geometry of a screw head bushing. A guide is provided through the conically tapering inner section of the screw head drive, thereby preventing the engagement geometry of the screw head drive from being inserted obliquely into the engagement geometry of the screw head bushing.

[0013] Preferably, the inner section of the screw head drive device of the present invention comprises a truncated cone surface inclined by 2.5° to 10° relative to the cylindrical surface. This achieves the following advantage: the screw head drive device attached obliquely can be aligned in a centered manner without requiring a large force.

[0014] The screw head drive of the present invention also comprises an insertion area with an insertion surface arranged between the outer section and the inner section, wherein the insertion surface has an inclination of approximately 10° relative to the base surface of the truncated cone of the inner section. As a result, the engagement geometry of the screw head drive can be more easily slid into the engagement geometry of the screw head bushing.

[0015] A coupling geometry of a screw head drive device may be a cross geometry, a Torx geometry or a straight geometry. The coupling geometry of the present invention is a straight geometry that passes through the screw head drive device on a second axis that is different from the first axis and is normal to the height of the screw head drive device. The forming tool of the present invention for forming a screw head bushing in a screw head comprises an outer section and an inner section following the outer section, wherein the inner section has a larger diameter than the outer section on at least one first axis that is normal to the height of the forming tool. The inner section is generally configured as a truncated cone that narrows toward the outer section, and the outer section comprises a coupling geometry that is configured to form an interlocking geometry in the screw head for accommodating the screw head drive device in a rotationally-resistant manner. The following advantage is thereby achieved: the screw head bushing of the present invention can be formed in a screw blank.

[0016] The inner section of the forming tool of the present invention preferably comprises a truncated cone surface inclined by 2.5° to 10° relative to the cylindrical surface. According to a preferred embodiment of the forming tool of the present invention, the forming tool also comprises an insertion region with an insertion surface arranged between the outer section and the inner section, wherein the insertion surface has an inclination of approximately 10° relative to the base surface of the truncated cone of the inner section. This enables simple insertion and centering of the screw head drive in the screw head bushing.

[0017] The engagement geometry of a forming tool may be a cross geometry, a Torx geometry or a straight geometry. The engagement geometry of the present invention is a straight geometry that passes through the forming tool on a second axis that is normal to the height of the forming tool and is different from the first axis.

[0018] The screw of the present invention comprises the screw head bushing of the present invention, which is preferably formed by means of the forming tool of the present invention.

[0019] The kit of the present invention includes the screw of the present invention and the screw head drive device of the present invention. Compared with the truncated cone surface of the outer section of the screw head bushing of the screw of the kit of the present invention, the truncated cone surface of the inner section of the screw head drive device of the kit of the present invention has a larger inclination angle relative to the cylindrical surface. Thereby, a friction fit is achieved between the screw head bushing of the screw and the screw head drive device, thereby providing a holding force. Through the holding force, the screw remains firmly on or inserted into the screw head drive device and can be easily attached to the workpiece. This holding force is easily overcome in the process of pulling the screw head drive device out of the screw head bushing. The construction scheme according to the present invention through the kit achieves the following advantages: a holding force acting on the screw can be provided without adding a magnetic component known in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1a is a transverse cross-sectional view of an exemplary screw head of a screw with a screw head bushing.

[0021] Figure 1b is based on Figure 1a Another transverse cross-sectional view of the screw head bushing.

[0022] Figure 1c is based on Figure 1a and Figure 1b Top view of the screw head bushing.

[0023] Figure 2a , Figure 2b and Figure 2c A further exemplary screw head bushing with an engagement geometry in the form of a cross geometry is shown.

[0024] Figure 3a , Figure 3b and Figure 3c A screw head bushing according to the invention is shown with an engagement geometry in the form of a straight geometry.

[0025] Figure 4a is a side view of an exemplary screw head drive device.

[0026] Figure 4b is based on Figure 4a A perspective view of a screw head drive device.

[0027] Figure 4c is based on Figure 4a and Figure 4b A top view of the screw head drive device.

[0028] Figure 5a , Figure 5b and Figure 5c A further exemplary screw head drive with an engagement geometry in the form of a cross geometry is shown.

[0029] Figure 6a , Figure 6b and Figure 6c A screw head drive according to the invention is shown with an engagement geometry in the form of a straight geometry.

[0030] Figure 7a and Figure 7b A forming tool with an example of a joining geometry in the form of a Torx geometry is shown.

[0031] Figure 8a and Figure 8b An exemplary forming tool with a joining geometry in the form of a cross geometry is shown.

[0032] Figure 9a and Figure 9b A forming tool according to the invention is shown with an engagement geometry in the form of a straight geometry.

[0033] Fig.10a and Fig.10b An exemplary embodiment is shown.

[0034] Fig.11a and Fig.11b Another exemplary second embodiment is shown.

[0035] Fig.12a and Figure 12b Another exemplary third embodiment is shown. DETAILED DESCRIPTION

[0036] Figure 1a 1 is a cross-sectional view of a screw head of a screw 1, for showing a screw head bushing 2 of the present invention arranged in the screw 1. The screw head bushing 2 has an outer section 3 and an inner section 4 following the outer section 3. The outer section 3 starts on the top surface 5 of the screw head, wherein in order to screw the screw 1 in, the outer section 3 is passed through the inner section 4. Figures 4a to 4c The screw head drive device 6 shown is inserted into the inner section 4. The outer section 3 is at least one Figure 1cThe first axis A1 shown along the normal to the depth T of the screw head bushing 2 has a larger diameter D than the inner section 4. This simplifies the insertion of the screw head drive 6 in the screw head bushing 2. The outer section 3 generally has the shape of a truncated cone that narrows toward the inner section 4. This provides guidance for the screw head drive 6. The inner section 4 is constructed as an engagement geometry for accommodating the screw head drive 6 in a rotationally fixed manner. The engagement geometry can be any geometry for screw drives known in the prior art. In particular, a cross geometry, a Torx geometry or a straight geometry is suitable as an engagement geometry. In FIGS. 1 to 4, the engagement geometry is shown in FIG. 5. Figure 1c . The Torx geometry is shown in FIG. . Due to the appropriate configuration of the outer section 3 and the inner section 4, the guidance of the screw head drive 6 during the insertion of the screw head bushing 2 can be improved and the screw head drive 6 can be centered in the screw head bushing 2 before the screw head drive 6 is completely engaged in the engagement geometry. This prevents the engagement geometry from being worn out due to improper insertion of the screw head drive 6. Figure 1b To include Figure 1a Another transverse cross-sectional view of the screw head of the screw 1 with the screw head bushing 2 shown, which is Figure 1a Compared to the rotation around the longitudinal axis L of the screw head bushing 2. Figure 1a to Figure 1c The scarfing geometry shown in FIG. 1 is a Torx geometry, in which Figure 1a The maximum diameter of the Torx geometry can be seen in . Figure 1c yes Figure 1a and Figure 1b , wherein the engagement geometry is shown in top view.

[0037] The outer section 3 of the screw head bushing of the present invention preferably has a truncated cone surface inclined by 2.5° to 10° relative to the cylindrical surface. Figure 1a and Figure 1b In the figure, the angle α is used to mark the screw head drive 6. This angle range has been proven to be particularly helpful for inserting the screw head drive 6.

[0038] Furthermore, the screw head bushing 2 according to the invention preferably comprises an insertion region 7 with an insertion surface 8 which is arranged between the outer section 3 and the inner section 4 . Figure 1a , Figure 1b and Figure 1c According to a preferred embodiment of the screw head bushing 2 of the present invention, the insertion surface 8 has the following Figure 1a The base surface of the truncated cone shown has an inclination angle β of approximately 10° relative to the outer section 3 . As a result, the engagement geometry of the screw head drive 6 can be slid more easily into the engagement geometry of the screw head bushing 2 .

[0039] Figure 2a , Figure 2b and Figure 2c An alternative embodiment of a screw head bushing 2 with an engagement geometry in the form of a cross geometry is shown, and Figure 3a , Figure 3b and Figure 3c A screw head bushing 2 according to the invention is shown with an engagement geometry in the form of a slotted geometry.

[0040] like Figure 3c As shown, within the scope of the present invention, the engagement geometry can be a straight-line geometry that passes through the screw head bushing 2 on a second axis A2 that is different from the first axis A1 and is normal to the depth T of the screw head bushing 2. The following advantage is achieved: the screw 1 equipped with the screw head bushing 2 of the present invention can be driven using a straight-line screw driver known in the prior art.

[0041] exist Figure 4a , Figure 4b and Figure 4c An exemplary screw head drive 6 is shown in FIG. The screw head drive 6 comprises an outer section 9 and an inner section 10 following the outer section 9, wherein the inner section 10 is provided at least one Figure 4c The first axis A1 shown along the normal to the height H of the screw head drive 6 has a larger diameter D than the outer section 9. The inner section 10 is substantially designed as a truncated cone that narrows toward the outer section 9. The outer section 9 has an engagement geometry that is designed to engage the screw head bushing 2 in a rotationally fixed manner. The engagement geometry can be any geometry known in the prior art for screw drives. This engagement geometry is in Figure 4b and Figure 4c Detailed description is given in Figures 4a to 4c , a Torx geometry is shown in FIG. In particular, a cross geometry, a Torx geometry or a straight geometry is selected as the engagement geometry. The screw head drive 6 and the screw head bushing 2 are substantially complementary geometries. A guide is provided through the conically tapered inner section 10 of the screw head drive 6 in combination with the conical design of the outer section 3 of the screw head bushing 2, thereby preventing the engagement geometry of the screw head drive 6 from being inserted obliquely into the engagement geometry of the screw head bushing 2. This prevents the screw head drive 6 from being improperly inserted into the screw head bushing 2 and prevents the screw head drive 6 from slipping in the screw head bushing 2.

[0042] The inner section 10 of the screw head drive device 6 of the present invention comprises a truncated cone surface inclined at 2.5° to 10° relative to the cylindrical surface. Figure 4a In the embodiment, this inclination angle is indicated by the inclination angle γ. It has been proved that this angle range is particularly helpful for the screw head drive device 6 to be inserted.

[0043] Furthermore, the screw head drive 6 of the present invention preferably comprises an insertion region 11 having an insertion surface 12 which is arranged between the outer section 9 and the inner section 10 . Figure 4b and Figure 4c The insertion surface 12 is shown. The insertion surface 12 preferably has a Figure 4b The base surface of the truncated cone shown has an inclination angle δ of approximately 10° relative to the inner section 10 . As a result, the engagement geometry of the screw head drive 6 can be slid more easily into the engagement geometry of the screw head bushing 2 .

[0044] Figure 5a , Figure 5b and Figure 5c An exemplary screw head drive 6 with a coupling geometry in the form of a cross geometry is shown, and Figure 6a , Figure 6b and Figure 6c The screw head drive 6 according to the invention is shown with a coupling geometry in the form of a straight geometry.

[0045] like Figure 6c As shown, the engagement geometry may be a straight geometry that passes through the screw head drive 6 according to the invention on a second axis A2 that is different from the first axis A1 and is normal to the height H of the screw head drive 6 .

[0046] The forming tool 13 for forming the screw head bushing 2 in the screw head of the present invention is used in the production of screws to form the screw head bushing 2 of the present invention in the screw head of the screw blank. The geometric structure of this forming tool 13 is substantially the same as the screw head drive device 6 of the present invention. Therefore, the forming tool 13 and the screw head bushing 2 are substantially complementary geometric shapes. Therefore, Figure 4a , 4b and 4c, Figure 5a , 5b and 5c, and Figure 6a , 6b 6c also exemplarily show the upper section of the forming tool 13 of the present invention.

[0047] Like the screw head drive 6, the forming tool 13 for forming the screw head bushing 2 in the screw head comprises an outer section 9 and an inner section 10 following the outer section 9, wherein the inner section 10 has a larger diameter D than the outer section 9 on at least one first axis A1 normal to the height H of the forming tool 13. The inner section 10 is substantially configured as a truncated cone that narrows toward the outer section 9, and the outer section 9 comprises an engagement geometry that is configured to form an engagement geometry in the screw head for rotationally accommodating the screw head drive 6. Within the scope of the present invention, the engagement geometry or engagement geometry can be any geometry for screw drives known from the prior art.

[0048] The inner section 10 of the forming tool 13 preferably comprises a truncated cone surface inclined at 2.5° to 10° relative to the cylindrical surface. Figure 4a In the embodiment, this inclination angle is indicated by the inclination angle γ. It has been proved that this angle range is particularly helpful for the screw head drive device 6 to be inserted.

[0049] According to a preferred embodiment of the forming tool 13 of the invention, the forming tool comprises an insertion region 11 with an insertion surface 12 arranged between the outer section 9 and the inner section 10. The insertion surface 12 preferably has a Figure 4b The base surface of the truncated cone shown has an inclination angle δ of approximately 10° relative to the inner section 10 . As a result, the engagement geometry of the screw head drive 6 can be slid more easily into the engagement geometry of the screw head bushing 2 .

[0050] Figure 5a , Figure 5b and Figure 5c An alternative embodiment of the forming tool 13 of the invention is shown with an engagement geometry in the form of a cross geometry, and Figure 6a , Figure 6b and Figure 6c A further embodiment of a forming tool 13 according to the invention is shown with a joining geometry in the form of a square geometry.

[0051] like Figure 6c As shown, the engagement geometry may be a straight geometry through the forming tool 13 on a second axis A2 different from the first axis A1 and normal to the height H of the screw head drive 6 .

[0052] Figures 7a to 9b is a generally complete schematic diagram of an exemplary forming tool 13, wherein the forming tool 13 includes a section 14 for fixing the forming tool 13 in a screw production device. Figure 7a and Figure 7b An exemplary forming tool 13 with a joining geometry in the form of a Torx geometry is shown in two different sizes. Figure 8a and Figure 8b An exemplary forming tool 13 with a joining geometry in the form of a cross geometry is shown in two different sizes, and Figure 9a and Figure 9b The forming tool 13 according to the invention with a joining geometry in the form of a square geometry is shown in two different sizes.

[0053] The kit of the present invention comprises the screw 1 of the present invention and the screw head drive device 6 of the present invention. Compared with the truncated cone surface of the outer section 3 of the screw head bushing 2 of the screw 1 of the present invention, the inclination angle γ of the truncated cone surface of the inner section 10 of the screw head drive device 6 of the kit of the present invention relative to the cylindrical surface is larger. Thereby, in the process of inserting the screw head drive device 6 into the screw head bushing 2 of the screw 1, a shape fit is achieved between the truncated cone surface of the screw head bushing 2 and the truncated cone surface of the screw head drive device 6, and the screw 1 is firmly inserted on the screw head drive device 6. The advantage of this scheme is that the screw 1 can be simply attached to the workpiece and screwed in without holding. In addition, there is no need to set a magnet assembly in the screw head drive device 6. Tests have shown that the screw head drives currently available on the market are usually oversized. For example, in the case of a wooden screw with a diameter of 4 mm, the TX25 drive device known in the prior art can transmit a multiple value of the breaking torque of the screw because the drive device has a relatively large depth. This knowledge is utilized within the scope of the present invention, since it can be seen from this that the entire depth of the drive is not required in order to screw in the screw. Therefore, according to the present invention, part of the depth is used for a self-adhesive form fit, so that the screw 1 is held on the screw head drive 6. In this case, different angles α and γ through the two truncated cone surfaces of the screw head drive 6 and the screw head bushing 2, for example 5° on the screw head bushing 2 and 10° on the screw head drive 6, achieve a very effective form fit, which holds the screw 1 on the screw head drive 6. This inventive effect can be applied to any type of screw drive geometry. Another advantage is that a neat guidance in the axial direction of the screw head drive 6 is achieved. This prevents the screw head drive 6 from being attached to the screw 1 obliquely or skewed, thereby minimizing or even completely avoiding accidental wear of the screw head bushing 2 and / or excessive wear of the screw head drive 6.

[0054] Fig.10a and Fig.10b An exemplary screw 1 is shown. Fig.10a shows a top view of an exemplary screw 1, and Fig.10b Shows the Fig.10a 1 shows an exemplary cross-sectional view of a screw. The screw 1 has a projection 15 which surrounds the outer section 3 of the screw head bushing 2 substantially annularly and extends substantially in the direction of the longitudinal axis of the screw 1. The projection 15 preferably has a height of 0.75 mm. The projection 15 has the advantage that an additional depth T is provided for the screw head bushing 2, so that the outer section 3 can extend at least partially into the projection 15. This allows the depth of the inner section 4 to be increased, thereby providing a larger force transmission contact surface between the engagement geometry of the screw head bushing 2 and the engagement geometry of the screw head driver 6.

[0055] Fig.11a and Fig.11bA second embodiment of a further exemplary screw 1 is shown, wherein the screw 1 has a cover surface 16 which surrounds the outer section 3 of the screw head bushing 2 substantially annularly and slopes outwardly in the radial direction of the screw 2. The cover surface 16 is preferably sloped at a height of 0.75 mm. Fig.11a A top view of the screw 1 is shown, and Fig.11b Shows the Fig.11a The shape of the cover surface 16 also achieves the technical effect of providing an additional depth T of the screw head bushing 2.

[0056] Fig.12a and Figure 12b Another exemplary screw 1 is shown. Fig.12a A top view of the screw 1 is shown, and Figure 12b Shows the Fig.12a The screw 1 has an outer surface 17 which extends in the direction of the longitudinal axis of the screw 1 and substantially completely surrounds the outer section 3 of the screw head bushing 2. The outer surface 17 preferably has a height of 1.31 mm. The outer surface 17 also provides additional depth T for the screw head bushing 2 and additional mechanical stability for the outer section 3.

[0057] The TX25 drive known in the prior art has a screw head bushing depth T between 1.9 mm and 2.3 mm. These depths T are usually achieved with a screw head bushing diameter of 5 mm and a head diameter of 9.5 to 10 mm. In this case, the height of the screw head is 4.8 mm to 5.2 mm.

[0058] According to the screw size determined, the height of the screw head of the screw 1 according to the invention is in the range of 5.75 mm, whereby the depth of the engagement geometry of the inner section 4 is preferably about 1.95 mm. The head diameter of the screw 1 is about 10 mm. For screws of other sizes, these values ​​are adjusted according to their ratio.

Claims

1. A screw head bushing (2) for a screw (1), The screw head bushing (2) comprises an outer section (3) and an inner section (4) following the outer section (3), wherein the outer section (3) has a larger diameter (D) than the inner section (4) on at least one first axis (A1) normal to the depth (T) of the screw head bushing (2), It is characterized in that The outer section (3) is generally constructed as a truncated cone that narrows toward the inner section (4), and the inner section (4) is constructed as an engagement geometry structure for accommodating a screw head drive device (6) in a rotationally anti-rotational manner; wherein the engagement geometry structure is a straight-line geometry structure that passes through the screw head bushing (2) on a second axis (A2) that is different from the first axis (A1) and is normal to the depth (T) of the screw head bushing (2).

2. The screw head bushing (2) according to claim 1, characterized in that: The outer section (3) comprises a truncated cone surface inclined at 2.5° to 10° relative to the cylindrical surface.

3. The screw head bushing (2) according to claim 1 or 2, characterized in that: The screw head bushing (2) comprises an insertion area (11) arranged between an outer section (3) and an inner section (4) and having an insertion surface (12), wherein the insertion surface (12) has an inclination of approximately 10° relative to the base surface of the truncated cone of the outer section (3).

4. A screw head drive (6) comprising an outer section (9) and an inner section (10) following the outer section (9), wherein the inner section (10) has a larger diameter (D) than the outer section (9) on at least one first axis (A1) normal to the height (H) of the screw head drive (6), It is characterized in that The inner section (10) is generally constructed as a truncated cone that narrows toward the outer section (9), and the outer section (9) includes an engagement geometry structure, which is constructed as an engagement geometry structure that is anti-rotationally engaged with the screw head bushing (2), wherein the engagement geometry structure is a straight-line geometry structure that passes through the screw head drive device on a second axis (A2) that is different from the first axis (A1) and is normal to the height (H) of the screw head drive device (6).

5. The screw head driving device (6) according to claim 4, characterized in that: The inner section (10) comprises a truncated cone surface inclined at 2.5° to 10° relative to the cylindrical surface.

6. The screw head driving device (6) according to claim 4 or 5, characterized in that: The screw head drive (6) comprises an insertion area (11) with an insertion surface (12) arranged between an outer section (9) and an inner section (10), wherein the insertion surface (11) has an inclination of approximately 10° relative to the base surface of the truncated cone of the inner section.

7. A forming tool (13) for forming a screw head bushing (2) in a screw head, comprising an outer section (9) and an inner section (10) following the outer section (9), wherein the inner section (10) has a larger diameter (D) than the outer section (9) on at least one first axis (A1) normal to the height (H) of the forming tool (13), It is characterized in that The inner section (10) is generally constructed as a truncated cone that narrows toward the outer section (9), and the outer section (9) includes a coupling geometry structure that is constructed to form an interlocking geometry structure in the screw head for accommodating the screw head drive device (6) in a rotationally anti-rotational manner; wherein the coupling geometry structure is a straight-line geometry structure that passes through the forming tool (13) on a second axis (A2) that is different from the first axis (A1) and is normal to the height (H) of the forming tool (13).

8. The forming tool (13) according to claim 7, characterized in that The inner section (10) comprises a truncated cone surface inclined at 2.5° to 10° relative to the cylindrical surface.

9. The forming tool (13) according to claim 7 or 8, characterized in that The forming tool (13) comprises an insertion region (11) arranged between an outer section (9) and an inner section (10) and having an insertion surface (12), wherein the insertion surface (12) has an inclination of approximately 10° relative to the base surface of the truncated cone of the inner section (10).

10. A screw (1), characterized in that: The screw (1) comprises a screw head bushing (2) according to any one of claims 1 to 3.

11. The screw (1) according to claim 10, characterized in that The screw (1) has a projection (15) which surrounds the outer section (3) of the screw head bushing (2) in a substantially annular manner and extends substantially in the direction of the longitudinal axis of the screw (1).

12. The screw (1) according to claim 10, characterized in that The screw (1) has a cover surface (16) which surrounds the outer section (3) of the screw head bushing (2) in a substantially annular manner and is inclined outwardly in the radial direction of the screw (2).

13. The screw (1) according to claim 10, characterized in that The screw (1) has an outer surface (17) which extends in the direction of the longitudinal axis of the screw (1) and substantially completely surrounds the outer section (3) of the screw head bushing (2).

14. A kit, comprising a screw (1) according to any one of claims 10 to 13 and a screw head driving device (6) according to any one of claims 4 to 6, characterized in that: Compared with the truncated cone surface of the outer section (3) of the screw head bushing (2) of the screw, the truncated cone surface of the inner section (10) of the screw head drive device (6) has a larger inclination angle (γ) relative to the cylindrical surface.

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