SCREWDRIVER INSERT

Description

field of technology

[0001] The invention relates to a screw tool with an elongated shaft extending in the direction of an axis, which has at least at one of its two ends a first output profile for insertion into a screw tool insertion opening of a screw. State of the art

[0002] Screwdriver inserts are known, for example, from DE 10 2012 103 678 B4. A screwdriver insert has a shank that can be inserted into a polygonal opening of a bit holder. The shank can have a hexagonal cross-section. The end of the screwdriver insert opposite the shank forms a drive profile for insertion into a screwdriver bit holder opening of a screw.

[0003] DE 10 2007 041 574 A1 discloses a screwdriving tool which has output profiles at its opposite ends. The output profiles are of different sizes. DE 197 38 079 A1 shows an essentially hexagonal output profile.

[0004] A screwdriving tool of this type is described in GB 2390317A, which discloses the preamble of claim 1. A shaft has a polygonal profile and a cavity at each of its two free ends. Each cavity contains an insert with a different polygonal profile. A spring element acts on the two inserts such that they can be displaced into the cavity. In the position protruding from the cavity, the inserts are supported by stops against counter-stops on the shaft.

[0005] GB 2329859A describes a screw tool in which an insert is placed in a cavity, which is supported by a head on a step of the cavity and is acted upon by a spring element. Summary of the invention

[0006] The invention is based on the objective of further developing a screw tool of the generic type in a way that is advantageous for use.

[0007] The problem is solved by the invention specified in the claims, wherein the dependent claims represent not only advantageous further developments of the invention specified in the dependent claims, but also independent solutions to the problem.

[0008] First and essentially, it is proposed that the screwdriver has an elongated shaft. The elongated shaft has a drive profile at one end. In the region of the drive profile is an end face. The end face has an opening in a cavity. A slide insert, which is displaceable along the axis of the screwdriver shaft, is inserted into the cavity and is rotationally fixed to the shaft. The slide insert can be displaced against the restoring force of a spring element. One end of the insert protrudes from the cavity. This end forms a second drive profile. It is particularly intended that the second drive profile is similar to the first drive profile. For example, if the first drive profile has a hexagonal cross-section or a modified hexagonal cross-section, as described in DE 197 38 079 A1, then, according to a variant of the invention, the cross-section of the second drive profile has a similar cross-section.The second output profile differs from the first output profile primarily in its smaller wrench size. According to one embodiment, the first and second output profiles can also be dissimilar. For example, the second output profile may have a cross-slot profile, a slotted profile, or a circumferential wave profile, as described in DE 197 38 079 A1. The first output profile can also be such a wave profile. A further development of the invention proposes that the spring element extends into a chamber adjoining the cavity. It can be a pre-tensioned compression spring, and in particular a helical compression spring. One end of the spring element is supported against an end face of the insert. This end face is opposite the output profile of the insert.The insert can be designed to be fully inserted into the cavity against the restoring force of the spring element until one end face of the insert lies in the plane of the end face of the first output profile. The end of the insert opposite the second output profile can form a head projecting radially with respect to the axis. If a characteristic length is assigned to the shaft inserted in the cavity, for example, the edge length of the polygonal profile of the second output profile or the distance between two opposing faces of the polygonal profile, then the head has a characteristic length greater than this characteristic length. The radially projecting stop interacts with a step in the cavity or chambers, preventing the insert from being pushed out of the cavity by the compression spring.The pre-tensioned compression spring can thus hold the insert in a stop-limited position, in which the second output profile protrudes from the recess. A screw with one of these adapted screwdriver insertion openings can be turned using the second output profile. A screw with a larger screwdriver insertion opening can be turned using the first output profile. The screwdriver is inserted into this larger screwdriver insertion opening. The end face of the insert protruding from the recess contacts the bottom of the screwdriver insertion opening. By applying axial pressure, the insert retracts into the recess, allowing the first, larger output profile to be inserted into the screwdriver insertion opening. After turning the screw, the tool can be withdrawn from the screwdriver insertion opening.The relaxing compression spring then moves the insert back into the stop position.

[0009] The shaft can have a third output profile at its second end. Like the first output profile, the third output profile can be formed from the shaft as a single piece of material. The third output profile also has an end face with an opening in a cavity. This second cavity contains a second insert, which can also be displaced against the restoring force of a spring. This can be the same spring that also acts on the insert with the second output profile. The third output profile can be slightly larger or smaller than the first output profile. Preferably, however, the third output profile is larger than the second output profile. The fourth output profile is again different from the second output profile and can be larger or smaller than the second output profile.

[0010] The screwdriver tool according to the invention has a shank that can have differently sized output profiles at its two ends. The shank can have a larger diameter between the two output profiles. In the area between the output profiles, the shank can have a polygonal cross-section; for example, the polygonal profile can have a greater edge length than the polygonal profile of the two output profiles. The screwdriver tool can be a screwdriver bit. The profiled shank allows the screwdriver bit to be inserted into a drive tool, for example, into a polygonal mounting hole of a ratchet or ratchet. The shank has a central bore, produced by broaching or the like, which extends in the direction of the shank's axis from one end face to the other. The central bore is open on both sides.The two ends of the central bore form the aforementioned cavities, each containing an insert with differently sized output profiles. The insert in the first cavity forms the second output profile, which is smaller than the third output profile formed by the second insert in a second cavity, the cross-sectional area of ​​which is larger than that of the first cavity. The head of the first insert can have a cross-section larger than that of the second output profile and approximately equal to the cross-section of the second cavity, allowing the first insert to be inserted through the second cavity into the central bore. After the first insert is inserted, the spring element is placed into the central bore so that it rests in the chamber adjacent to the cavity. Finally, the second insert is inserted into the second cavity.This component has a circumferential groove at its end opposite the output profile. A C-shaped, radially inward elastically deformable stop element, such as a C-shaped spring element, lies within this circumferential groove. The stop element can be deformed sufficiently to allow the second insert to be inserted into the second cavity. Adjoining the second cavity is a chamber with a larger cross-section, forming a step. When the compressed stop element reaches the chamber, it expands radially outward and rests against the step. The second insert can then be inserted into its corresponding cavity in the same manner as the first, until the end face of the insert is flush with the end face of the shaft containing the cavity.The compression spring can also be designed such that both inserts can be fully inserted into their respective cavities simultaneously, so that the end face of the first output profile lies in the same plane as the end face of the second output profile, and the end face of the third output profile lies in the same plane as the end face of the fourth output profile. It can be provided that both inserts each have circumferential grooves in which an elastically deformable stop element, for example a C-shaped spring element, is inserted. Brief description of the drawings

[0011] Exemplary embodiments of the invention are explained below with reference to the accompanying drawings. These show: Fig. 1 shows a view of a screwdriver insert of a first embodiment, Fig. 2 shows an end view of the screwdriver insert, Fig. 3 shows the section along line III-III, Fig. 4 shows a first application in which a first output profile 2 is inserted into a screwdriver insertion opening 32 of a screw 31, Fig. 5 shows a second application in which a second output profile 21 is inserted into a screwdriver insertion opening 32 of a screw 31, Fig. 6 shows a third application in which a third output profile 12 is inserted into a screwdriver insertion opening 32 of a screw 31, Fig. 7 shows a fourth application in which a fourth output profile 27 is inserted into a screwdriver insertion opening 32 of a screw 31, Fig. 8 shows a partially cutaway perspective view of the first embodiment, Fig. 9 shows a view according to Fig. 3 of a second embodiment, Fig. 10 a representation according to Fig. 9 , wherein both inserts 19, 25 are simultaneously fully inserted into their respective cavities 4, 14, Fig. 11 a first variant of an insert 19 in the form of a polygonal output profile 21, Fig. 12 a second variant of an insert 19, with an output profile 21 in the form of a circumferential wave profile, Fig. 13 a third variant of an insert 19 also with an output profile 21 in the form of a circumferential wave profile, but with an opening 34 arranged in the end face 20, Fig. 14 a fourth variant of an insert 19 with an output profile 21 in the form of an elongated rectangle for engagement in the slot of a slotted screw, Fig. 15 in a representation according to Fig. 1 a fifth embodiment, Fig. 16 in a representation according to Fig. 2 the fifth embodiment, Fig. 17 in a representation according to Fig. 1 a sixth embodiment, Fig. 18 in a representation according to Fig. 2the sixth embodiment, Fig. 19 in a representation according to Fig. 3 the sixth embodiment, Description of the embodiments

[0012] The screwdriver bit has a shaft 1 with a length of approximately 25-30 mm. A central section of the shaft 1 has a hexagonal cross-sectional profile with corner recesses 16 at the polygonal corners of the profile. These corner recesses 16 allow the shaft to be temporarily fixed in an insertion opening of a drive tool (not shown) so that it can be rotated with the drive tool. The drive tool can be a screwdriver, and in particular a ratchet or a ratchet wrench.

[0013] The first end of the shaft 1 forms a first output profile 2 with a hexagonal cross-section. The first output profile 2 has an end face 3 with an opening of a cavity 4.

[0014] The second end of the shaft 1 forms a third output profile 12, which is also a hexagonal profile, but with a slightly longer edge length. The end face 13 of the third output profile 12 has an opening of a cavity 14.

[0015] The two cavities 4 and 14, together with a chamber 6 consisting of chamber sections 7 and 8, form a central bore extending along an axis A of the shaft 1. While the cross-sectional areas of cavities 4 and 14 are hexagonal, the cross-sections of chamber sections 7 and 8 can be round or also polygonal. Chamber 6 forms a first chamber section 7 with a cross-section that transitions into a second chamber section 8, which has a larger cross-section, by forming a step 9.

[0016] A first insert 19 is located in the cavity 4. This insert, with a section projecting from the cavity 4, forms a second output profile 21, which in this embodiment is a hexagonal profile. The insert 19 has a constant hexagonal cross-section from its end face 20 to a head 22. The cross-section of the head 22 is larger than the cross-section of the cavity 4, so that the head 22 forms radially projecting stop surfaces 23 that bear against a step 15 where the chamber section 7 transitions into the cavity 4. The insert 19 is thus held in the cavity 4 with limited movement and is rotationally fixed.

[0017] The cavity 14 has an inner cross-section that is slightly larger than the cross-section of the head 22, so that the insert 19 can be inserted through the cavity 14.

[0018] A compression spring 10, and in particular a helical compression spring 10, is provided, which is supported with one of its two ends on an end face 24 of the insert 19.

[0019] A second insert 25, which forms a shaft 28 extending over the entire length of the insert 25, has a hexagonal cross-section over its entire length, which is slightly smaller than the hexagonal cross-section of the cavity 14. Its end protruding from the cavity 14 forms a fourth output profile 27, which is larger than the second output profile 21 but smaller than the first output profile 2.

[0020] The end of the insert 25, which projects into the chamber section 8, has a circumferential groove 30. The circumferential groove 30 is deep enough to accommodate a spring-loaded clamping ring 11. When the clamping ring 11 is compressed radially, the insert 25 can be inserted into the cavity 14 with its end face 29 leading. The second end of the spring element 10 bears against the end face 29. If the clamping ring 11 passes over the step 15', it can move radially to engage a second step 15', thus preventing the insert 25, which is fixed to the shaft, from protruding from the cavity 14.

[0021] The compression spring 10, compressed during assembly, holds the two inserts 19, 25 in the Figure 3The depicted stop-limited advance position, in which the second output profile 21 and the fourth output profile 27 protrude beyond their respective end faces 3, 13 of the shaft 1. By applying axial pressure either to the end face 20 of the insert 19 or to the end face 26 of the insert 25, the respective insert 19, 25 can be displaced axially until its end face 20 or 26 is aligned with the end face 3, 13 of the shaft 1.

[0022] The operating principle of the screwdriver is as follows: In order to turn a screw 31 with the first output profile 2, the second output profile 21 must be inserted into the screwdriver insertion opening 32 of the screw 31. Since the screwdriver insertion opening 32 corresponds to the size of the first output profile 2 and the end face 20 of the second output profile 21 rests on the base 33 of the screwdriver insertion opening 32, the insert 19 is displaced into the cavity 4 when an axial force is applied to the shank 1, so that the first output profile 2 is inserted into the screwdriver insertion opening 32 according to Figure 4 can be inserted. The stop surface 23 of the head 22 has moved away from the step 15. When the first output profile 2 is pulled out of the screwdriver insertion opening 32, the compression spring 10 pushes the insert 19 back into the initial position shown in Figure 3.

[0023] The Figure 5Figure 1 shows the use of the second output profile 21 in a screwdriver insertion opening 23 with a cross-section corresponding to the second output profile 21. When the second output profile 21 is inserted into the screwdriver insertion opening 32, the end face 20 will also be supported on the base 33. However, here the end face 3 of the first output profile 2 is supported on the end face of the screw. <opfes ab. Die Anschlagfläche 23 kann sich geringfügig von der Stufe 15 beabstanden.

[0024] The Figure 6 shows a use case analogous to Figure 4, in which the screwdriver insertion opening of the screw 31 has a cross-section corresponding to the cross-section of the third output profile 12. When the third output profile 12 is inserted into the screwdriver insertion opening 32, the end face 26 of the insert 25 rests on the base 33 of the screwdriver insertion opening 32. The insert 25 moves into the cavity 14, with the clamping ring 11 moving away from the step 15.

[0025] The Figure 7 shows a use case analogous to Figure 5 The cross-section of the screw tool insertion opening 32 corresponds here to the cross-section of the fourth output profile 27. If the fourth output profile 27 is inserted into the screw tool insertion opening 32, the end face 13 of the third output profile 12 can rest on the end face of the screw head of the screw 31.

[0026] In each of the Figures 4 - 7In the illustrated operating positions, the shaft can be driven by rotation to turn the screw 31. For this purpose, a suitable screwdriver engages the polygonal surfaces of the central section of the shaft 1. The polygonal surfaces of the inserts 19, 25 bear in contact with the polygonal surfaces of the cavities 4, 14, so that the inserts 19, 25 are axially displaceable but rotationally fixed to the shaft 1. The screwdriver, which is approximately 35 mm long overall, is thus able to operate screws with four different-sized screwdriver insertion openings.

[0027] The Figure 9Figure 1 shows a second embodiment, which differs from the first embodiment essentially only in that the insert 19 also has a circumferential groove 30 at its end facing away from the output profile 21, in which a spring ring is arranged. The invention thus also includes screwdriver inserts in which both inserts 19, 25 each have circumferential grooves 30 with C-shaped spring rings inserted therein at their ends opposite the output profiles 21, 27.

[0028] The Figure 10Figure 1 shows a situation in which both inserts 19 and 25 are fully inserted into their respective recesses 4 and 14, so that the end face 20 is flush with the end face 3 and the end face 26 is flush with the end face 13. This position can be achieved, in particular, when the screwdriver insert is inserted into a standard bit holder that has a blind hole into which the shaft 1 can be inserted and which has retaining elements such as detent balls that engage in corner recesses 16. The end face 20 or 26 then rests against the bottom of the blind hole.

[0029] The Figure 11 Figure 19 shows a perspective view of an insert with a polygonal cross-section. This could also be a square cross-section as a drive profile 21.

[0030] The Figure 12Figure 1 shows a perspective view of an insert 19 with a circumferential wave profile as output profile 21, as is known under the name Torx.

[0031] The Figure 13 shows a modification of the one in the Figure 12 The illustrated insert 19. Here too, the output profile 21 has a Torx profile. However, the end face 20 has an opening 34.

[0032] The Figure 14 Figure 1 shows a perspective view of an insert 19 with a drive profile 21 for insertion into a slot of a slotted screw.

[0033] Other embodiments, not shown in the figures, differ from those shown in the Figures 11 - 14 The drive profiles 21 are designed, for example, a cross-slot profile or a triangular profile. The rear section of the inserts, which is inserted into the cavity of the shaft, is profiled as a polygon.

[0034] The Figures 15 and 16Figure 1 shows a fifth embodiment in which the output profiles 2 and 12 are Torx profiles with different wrench sizes. The output profiles 21 and 27 have a hexagonal profile.

[0035] The Figures 17-19 Figure 1 shows a sixth embodiment in which the first and second output profiles 2, 12 are hexagonal profiles. The output profiles 21 and 27 of the inserts 19, 25, which are inserted in end-face openings, are not polygonal profiles. Insert 19 has a cross-slot profile. Insert 25 has a flat profile. The shaft 1 has a through-bore forming the chamber 6, open from end face 3 to the opposite end face 13, which has a cross-sectionally enlarged area in its center in which the spring element 10 extends, which exerts a spring force on the two inserts 19, 25 in a direction pointing away from each other.

[0036] Even in the Figures 15 - 19In the illustrated embodiments, the sections of chamber 6 in which the inserts 19, 25 are slidably mounted have a polygonal profile, in particular a hexagonal profile. The sections of the inserts 19, 25 that are slidably mounted therein have a corresponding hexagonal profile. The two inserts 19, 25 can be fully inserted into chamber 6 in the manner described above until the end face 20 is flush with the end face 3 or the end face 26 is flush with the end face 13.

[0037] List of reference symbols 1 shaft 29 Front surface 2 first downforce profile 30 circumferential groove 3 Front 31 screw 4 cavity 32 screwdriver insertion opening 5 Level 6 chamber 33 Floor 7 Chamber section 34 Support element 8 Chamber section 9 Level A axis 10 Compression spring 11 clamping ring 12 third downforce profile 13 Front 14 cavity 15 Level 15' Level 16 Corner recess 17 Level 18 Level 19 Mission 20 Front 21 second downforce profile 22 Head 23 Stop surface 24 Front surface 25 Mission 26 Front 27 fourth downforce profile 28 shaft

Claims

1. A screwdriving tool with an elongate shaft (1), which respectively has on both of its ends an output profile (2, 12) for insertion into a screwdriving tool insertion opening (23) of a screw (31), and with a first insert (19) and a second insert (25), wherein said inserts (19, 25) are respectively arranged in a first and second cavity (4, 14), which is open toward an end face (3) of the output profiles (2, 12), in a rotationally fixed and axially displaceable manner, respectively form an output profile (21, 27) with their ends protruding out of the cavity (4, 14), are respectively supported with a stop on a counter stop of the shaft (1) in a position, in which they protrude out of the cavity, and can be displaced into the respective cavity (4, 14) against the restoring force of a spring element (10), which is arranged in a chamber (7, 8) extending between the first cavity (4) in the second cavity (14), by exerting an axial force, characterized in that the first cavity (4) and the second cavity (14) respectively transform into the chamber (7, 8), which has a greater internal cross-sectional area than the adjoining cavity (4, 14), such that a first and a second step (15, 15') are formed, wherein the first step (15) forms the counter stop, on which the stop of the first insert (19) is supported, and the second step (15') forms the counter stop of the second insert (25), on which the stop (11) of the second insert (25), which can be elastically deformed radially inward, is supported.

2. The screwdriving tool according to claim 1, characterized in that the stop (11), which can be elastically deformed radially inward, has a ring shape and lies in a depression (30) of the second insert (25).

3. The screwdriving tool according to claim 2, characterized in that the stop (11) is a clamping ring with an open gap and the depression (30) is a circumferential groove in the second insert (25).

4. The screwdriving tool according to one of the preceding claims, characterized in that the chamber (7, 8) forms a first chamber section (7) adjoining the first step (15) and a second chamber section (8) adjoining the second step (15'), wherein the internal cross-sectional area of said second chamber section is greater than the internal cross-sectional area of the first chamber section (7).

5. The screwdriving tool according to one of the preceding claims, characterized in that the stop of the first insert (19) is formed by a head (22), the cross section of which is larger than the internal cross section of the cavity (4) and which forms radially protruding stop surfaces (23) supported on the first step (15), and / or in that the first cavity (4) has a polygonal cross section and the head (22) is supported on the step (15) on each polygon side.

6. The screwdriving tool according to one of the preceding claims, characterized in that the spring element (10) is supported on an end face (24, 29) of one of the two inserts (19, 25) with each of its two ends.

7. The screwdriving tool according to one of the claims 5 or 6, characterized in that the head (22) has such a cross-sectional area that the first insert (19) including the head (22) can be axially inserted into the chamber (6, 7) through the second cavity (14).

8. The screwdriving tool according to one of the preceding claims, characterized in that the output profile of the shaft (1), which is spatially assigned to the first cavity (4), forms a first output profile, the output profile of the first insert (19) forms a second output profile, the output profile of the shaft (1), which is spatially assigned to the second cavity (14), forms a third output profile and the output profile of the second insert (25) forms a fourth output profile.

9. The screwdriving tool according to one of the preceding claims, characterized in that the output profiles (2, 12, 21, 27) are polygonal profiles with different edge lengths and / or in that the output profiles (2, 12, 21, 27) have similar circumferential wave profiles and / or in that the cross sections of the second output profile (21) or the fourth output profile (27) formed by the insert (19, 25) are dissimilar to the cross section of the first output profile (2) or the third output profile (12) assigned to the insert (19, 25) and / or in that the second output profile (21) or the fourth output profile (27) has a cross slot profile or a slot profile.

10. The screwdriving tool according to one of the preceding claims, characterized in that the second output profile (21) and / or the fourth output profile (27) can be completely displaced into the cavity (4) in such a way that the end face (20, 24) of the insert (19, 25) and the end face (3, 13) of the shaft (1) lie flush in a common plane and / or in that the second output profile (21) and the fourth output profile (27) can be completely displaced into the cavity (4) simultaneously.

11. The screwdriving tool according to one of the preceding claims, characterized in that the shaft (1) is formed by a screwdriver insert that can be inserted into a polygonal chuck.

12. The screwdriving tool according to one of claims 1, 2, 3, 7, 8 or 9, characterized in that the insert (19) lies in a chamber (6) in the form of a blind bore or in a chamber (6) that is closed by a support element (34), wherein the spring element (10) is supported on the base (41) of the chamber (6) or on the support element (34).