Drilling and / or screwing tool

Abstract

A drilling and / or screwing tool (1) comprising an axially extended shaft (2) and comprising an axial inner receiving channel (3) which has, at each of two mutually axially opposite ends (4; 5), an insertion facility for a torque-transmitting unit (6; 7), said insertion facility being secured against relative rotation, is designed such that at least one insertion facility has radially inwardly protruding retaining means (8) for axially positionally securing at least one torque-transmitting unit (6; 7), which retaining means can be pressed inward from radially outside by means of spring force and / or by means of an outer pressing element (27) which exerts a force radially inward.

Description

[0001] Description:

[0002] DRILLING AND / OR SCREWING TOOL

[0003] The invention relates to a drilling and / or screwing tool for manual use or for use in a motor-driven tool according to the preamble of claim 1 or claim 11.

[0004] EP 0 968 793 A2 discloses a tool comprising a shaft that allows the insertion of a tool for rotating the shaft at one end. A bit holder can be inserted at the other axial end, which in turn carries the bit required for the actual machining operation. However, the tool requires considerable space, particularly a large axial length. This imposes limitations, particularly in tight corners of furniture or similar small structures. This limits the possible applications.

[0005] The invention is based on the problem of creating an improvement in this regard. The invention solves this problem by a tool having the features of claim 1 or claim 15. Regarding advantageous embodiments and further developments of the invention, reference is made to the further claims 2 to 14 and 16 to 17.

[0006] Because in a drilling and / or screwing tool with an axially extending shaft and with an axial inner receiving channel, which has a rotation-proof insertion option for a torque-transmitting unit at two axially opposite ends, at least one insertion option has holding means that project radially inwards and can be pressed inwards from the radial outside by means of spring force and / or by means of an external pressure element exerting a force radially inwards to axially secure the position of a torque-transmitting unit, a torque-transmitting unit can be inserted at at least one axial end up to the holding means, so that the shaft can be kept very short and can therefore be used more easily even in tight corner areas.In particular, such holding means are provided for both axial ends of the shaft in order to achieve a drive side on one side and an output side on the other side.

[0007] The retaining elements can therefore be optimally arranged in two units, axially closely spaced one after the other in the axial center area. This allows both axial ends to be used equally for securing torque-transmitting units. Both inserted torque-transmitting units can then be inserted into the axial center area.

[0008] The shaft can be kept particularly short to ensure minimal tool dimensions. The retaining elements are particularly advantageously designed as balls, so that they can counteract forces from all sides equally. The distribution of the retaining elements can be equidistant across the circumference of the shaft.

[0009] To enable radially inward preloading of the retaining elements, spring collars are provided on the outside of the shaft, arranged axially one behind the other and preloaded for radially pressing in balls. These collars are each open at one point around the circumference. These collars can be made of stainless steel, for example, and can encompass the shaft almost completely.

[0010] If circumferential grooves are provided on the outside of the shaft for axial securing of the spring collars, the axial length of each of which corresponds to the axial extension of a spring collar, the spring collars can be secured in position to prevent axial displacement. An anti-twist device for the spring collars is not required.

[0011] If the outer pressure element, which applies force radially inward to the retaining means, is formed by an axially displaceable sliding sleeve secured against axial withdrawal by at least one circlip (28), a high radial force can be exerted. At the same time, only a slight displacement of the sliding sleeve may be sufficient to move the retaining means into a position behind the inner cutouts of the sliding sleeve, thus releasing them sufficiently so that an otherwise retained torque-transmitting unit can be easily withdrawn.

[0012] Advantageously, the pressure element can be held in its axial position by a spring-loaded locking device in a position that directly or indirectly presses the holding means radially inward, thus preventing accidental release of the pressure element. Advantageously, at least three holding means for an inserted torque-transmitting unit are arranged, distributed around the circumference, offset from one another by 120°. To secure the holding of engaging torque-transmitting units, these can be provided with a circumferential outer groove or similar recess shortly before their axial end, into which the holding means can spring back radially inward, thus securing against accidental axial withdrawal.

[0013] If the anti-twist insertion option forms a hexagon socket at least in its axially outer edge area, each torque-transmitting unit inserted into the shaft can form an external hexagon, thus ensuring secure and slip-free torque transmission. Other retaining profiles are also possible, for example, a 12- or 18-edge profile, or a Torx or star shape.

[0014] In particular, one hexagon socket has an inner dimension of 10 millimeters, and another hexagon socket has an inner dimension of 13 millimeters. Other dimensions, including inch dimensions, are also possible. This allows adaptation to various other tool holders or drive shafts by rotating the shaft. The shaft's application possibilities can therefore be significantly expanded by rotating and exchanging the drive and output sides.

[0015] If the shaft has a stop for an engaging torque-transmitting unit in the axial center of the receiving channel, effective from each axial side, units can be inserted from both sides and advanced to this stop. This minimizes the length of the shaft. In particular, the torque-transmitting unit on the drive side, i.e., ultimately the drive shaft, can be inserted up to approximately the axial center of the shaft, thus enabling a particularly short shaft.

[0016] In particular, the drive shaft can also be recessed in its radially inner region to form a receiving space. Thus, this first torque-transmitting unit can accommodate a bit from the second torque-transmitting unit in its radially inner region without having to extend the length of the shaft. Therefore, even if the second torque-transmitting unit, for example, a bit holder on the output side, is equipped with two bits, this second unit can be inserted into the shaft in any orientation.

[0017] This makes it easy to connect the drilling and / or screwing tool axially at one end to a motor shaft of a drive via a first torque-transmitting unit - or even with a handle to form the drive and, if necessary, to reach tight corners.

[0018] To prevent a sudden, excessive torque from the driving first torque-transmitting unit, which could loosen a screw head, this unit can be equipped with an elastically deformable torsion element that, when inserted into the shaft, establishes torque-transmitting contact with it. This element can be optimized for elasticity and sliding properties.

[0019] To enable easy replacement of a possibly worn torsion element, the latter can be pushed onto the first torque-transmitting unit and can be easily replaced. In the embodiment according to claim 11, in a drilling and / or screwdriving tool with an axially extending shaft and an axial inner receiving channel, which has a rotation-proof insertion option for a torque-transmitting unit at each of two axially opposite ends, a head part can be placed on at least one of the torque-transmitting units, which is provided with a magnetic force pointing axially outwards from the drilling and / or screwdriving tool and can hold a screw or similar working tool thereon, the possibility of magnetically holding the screw or the like is opened up. At the same time, it is not mandatory that this head part be placed on. The minimum tool length without the head part can therefore be maintained.

[0020] Particularly advantageously, the head section can be mounted on the torque-transmitting unit in two positions rotated 180° to each other. Then, in the second position, the head section can be pushed slightly away from the drilling and / or screwdriving tool, forming the axially furthest forward end and thus making contact with a screw or similar tool before an inserted bit. Alternatively, in the first insertion position, the head section can be tightened directly to the shaft, so that the bit inserted at the front end remains visible, thus facilitating orientation during screwing.

[0021] In the mounted position, the head part can be axially displaced by several millimeters relative to the torque-transmitting unit that supports it, so that the screw can be easily removed from the magnetic end.

[0022] The head part is particularly axially secured, but rotatable relative to the torque-transmitting unit that supports it, so that the head part can stop its rotational movement when it hits material, thus keeping the surface of the workpiece free from damage.

[0023] Further advantages and features of the invention will become apparent from embodiments of the subject matter of the invention, some of which are illustrated in the drawings and described below.

[0024] The drawing shows:

[0025] Fig. 1 is a schematic view of a drilling and / or screwing tool according to the invention in an exploded view of the parts in a first embodiment without a magnetic head part and without an external pressure element,

[0026] Fig. 2 is a similar view to Figure 1, but in the assembled position of the parts belonging to the shaft and with exemplary screw bits and an exemplary screw,

[0027] Fig. 3 the parts according to Figure 2 in the inserted position of the torque transmitting units and with an additionally held magnetic head, here in the maximum tightened position to the shaft,

[0028] Fig. 4 is a similar representation to Figure 3, but with the magnetic head part in the maximum position repelled from the shaft,

[0029] Fig. 5 is a perspective view of the shaft and the torque transmitting units inserted therein on the drive side (below) and on the output side transmitting the torque (above), Fig. 6 is a perspective view of the unit transmitting the torque on the drive side,

[0030] Fig. 7 the unit according to Figure 6 in cross-sectional view,

[0031] Fig. 8 is a perspective view of the shaft,

[0032] Fig. 9 the shaft according to Figure 8 in cross-sectional view,

[0033] Fig. 10 is a perspective view of the unit transmitting the torque on the output side,

[0034] Fig. 1 1 the unit according to Figure 10 in cross-sectional view,

[0035] Fig. 12 the magnetic head part in side view,

[0036] Fig. 13 the magnetic head part in perspective view,

[0037] Fig. 14 the magnetic head part in cross-sectional view.

[0038] Fig. 15 an alternative version of the shaft with an outer

[0039] Pressure element in the form of a sliding sleeve, wherein this pressure element is set in the operating position to exert a holding, radially inward-pointing force on the holding means and is held therein by a radially outwardly spring-loaded safety device, which must be pressed in manually to move the sliding sleeve,

[0040] Fig. 16 is an exploded view of an alternative torque-transmitting unit having a replaceable torsion element for insertion into a hexagon socket of the shaft, wherein the torsion element can be secured in position on the torque-transmitting unit by means of a retaining ring,

[0041] Fig. 17 the torque transmitting unit provided with the torsion element and secured in cross-sectional view and in perspective view.

[0042] The drilling and / or screwdriving tool 1 shown in Figure 1 in a first version comprises an axially extending shaft 2 provided with an axial inner receiving channel 3, as can be clearly seen in Figures 8 and 9. The shaft 2 forms, at two axially opposite ends 4, 5, a rotation-proof insertion option for a torque-transmitting unit 6 or 7, respectively, which will be discussed in more detail below. The tool 1 can be driven in the rotational direction either manually, for example via an axial handle or a ratchet, or by a motor drive, for example a cordless screwdriver. Drives are not shown here.

[0043] At least one of the insertion options mentioned—here, both—has an axial position lock for a torque-transmitting unit 6 or 7. According to this version of the drawing, both insertion options, located 180° opposite each other, are provided with retaining means 8 that protrude radially inward and can be pressed inward from the radial outside by spring force. These can engage with inserted torque-transmitting units and then form axial position locks for them.

[0044] As can be seen in Figure 1, these retaining means 8 can be designed as balls made of stainless steel, for example. The at least three retaining means are distributed equidistantly around the circumference, i.e., here, with an angle of 120° between two retaining means 8, as can be seen in Figure 8 or Figure 9. More or fewer retaining means are also possible.

[0045] To generate the desired radially inward spring force on the retaining means 8, spring collars 9, 10 are provided on the outside of the shaft 2, arranged axially one behind the other and preloaded for radially pressing in balls. These collars can, for example, be axially spaced one after the other in the assembled position shown in Figure 2 and be wrapped around the shaft in the axially central region. The spring collars 9, 10 do not form completely closed rings.

[0046] For the axial securing of the spring collars 9, 10 on the outside of the shaft 2, circumferential grooves 11, 12 are provided, the axial length of which corresponds to the axial extent of each spring collar 9, 10, so that they are securely held there against axial displacement. The depth of the grooves 11, 12 corresponds approximately to the thickness of the spring collars 9, 10, so that in the assembled position they lie flush with the outer wall of the shaft 2 in a visually appealing manner, as can be clearly seen in Figure 2.

[0047] According to the drawing, the anti-twist insertion option forms a hexagon socket 13, 14 at least in its axially outer edge area 4, 5 (Figure 9). These hexagon socket formations can vary. Here, for example, one has a dimension of M10 at the axial end, while the opposite end 4 has a dimension M13. These dimensions are only examples, but are very common. Inch sizes are of course also possible. It is not mandatory on which side a drive-side unit 6 and on which side an output-side unit 7, for example a bit holder, engages. To securely hold inserted torque-transmitting units 6, 7, the shaft 2 has a stop 15 in the axially central area of ​​the receiving channel 3, which stop is effective from each axial side for an engaging torque-transmitting unit 6, 7.These can thus be inserted up to this stop 15, and thus very far—almost to axial contact with each other—separated only by the narrow stop 15. The shaft 2 can thus be kept extremely short axially, resulting in maximum flexibility and expanded application possibilities.

[0048] Furthermore, the shaft can also be used without a bit holder 7, for example to screw in or unscrew a nut. For this purpose, a threaded bolt on which this nut sits can penetrate very deeply into the receiving channel 3. This means that the tool 1 can machine not only the head side of a screw 20, but also the nut side. Depending on the orientation, threaded bolts of M6 or M8 screws can therefore engage in the receiving channel 3. This significantly expands the usability of the drilling and / or screwdriving tool 1, since the reception of the threaded bolt in the shaft 2 of the tool 1 also makes it easy to open or close nuts on screws. Nevertheless, the shaft 2 can be kept very short.

[0049] As already described above, the drilling and / or screwdriving tool 1 can be connected axially at one end of its shaft 2 - here at end 4 - to a motor shaft of a drive via a first torque-transmitting unit 6. As can be seen in Figures 6 and 7, this first torque-transmitting unit 6 is recessed in its radially inner region to form a receiving space 16. This allows, for example, the bit holder 7 inserted opposite it to be equipped with bits 17, 18 or similar insert tools at both ends when inserted. In the version according to Figures 16 and 17, this first torque-transmitting unit 6 is not a single piece, but has a replaceable torsion element that can be pushed onto the unit 6 from the outside and secured in position there by a retaining ring 30.

[0050] This torsion element 29 is elastic and ensures direct contact with the shaft 2 when the unit 6 is inserted into the shaft, for example, via a hexagon socket there. If the torque is too high, which could loosen a screw head, the torsion element 29 absorbs a significant portion of the torque, thus protecting the screw from damage. Furthermore, such a torsion element, which can be made of plastic, for example, can be replaced when it becomes worn.

[0051] The second torque-transmitting unit 7 can thus also be inserted into the shaft 2 in two different positions. Each of the bits 17, 18 or other insert tools can then engage in the receiving space 16 of the first torque-transmitting unit 6.

[0052] A drilling and / or screwing tool with an axially extending shaft 2 and with an axial inner receiving channel 3, which has a rotation-locked insertion option for a torque-transmitting unit 6, 7 at each of two axially opposite ends 4, 5, thus in particular also a drilling and / or screwing tool of the type described, can make it possible for a head part 19 to be placed on at least one of the torque-transmitting units 6, 7. This head part 19 is provided with a magnetic force directed axially outward from the drilling and / or screwing tool 1 and can hold a screw 20 or similar working medium thereon. This head part 19 can itself be held mechanically and / or (partially) magnetically, in particular on a second torque-transmitting unit 7, onto which it can be placed radially outward and axially secured.

[0053] To ensure secure attachment to the unit 7, the head portion 19 is provided, similar to the shaft itself, with retaining means 21—here again balls—that can be axially displaced by a few millimeters in axial slots 22. These balls are also preloaded radially inward on the outside by a spring collar, thus achieving releasable axial retention. An annular groove 25 is also provided here as a counterpart on the torque-transmitting unit 7.

[0054] The head section 19 can be placed on the torque-transmitting unit 7 in two positions rotated 180° to each other. These positions are shown in Figures 3 and 4. Two magnets 23, 24 are inserted around these different positions in the torque-transmitting unit 7; they attract each other and can thus hold each other and the inserted bits 16, 17 in place. To ensure an attraction between the magnets 23, 24, they are aligned so that the north pole of one magnet meets the south pole of the other. The external effect therefore differs depending on which way the torque-transmitting unit 7 is inserted into the shaft 2. In the illustration in Figure 1, the magnetic north pole of the magnet 23 is at the top; if the torque-transmitting unit 7 were rotated 180°, this would be the other way around.Since the head portion 19 itself is magnetic, it can be held in two different positions: with maximum attraction (Figure 3) or with maximum repulsion (Figure 4). At the same time, in both cases, it is mechanically held firmly by the balls 21, which engage in a groove 25 of the bit holder 7, so that the maximum possible displacement path is defined by the length of the slots 22. Thus, in the mounted position, always aligned with the screw 20, the head portion 19 can be axially displaced by several millimeters relative to the torque-transmitting unit 7 that supports it - depending on the orientation of this unit 7.

[0055] The head portion 19 can accommodate a ring magnet (not shown) in an annular gap 26 at the outward-facing end of the head portion. A neodymium magnet is particularly suitable for this purpose. In particular, the magnet is provided in an annular groove at the axially front end of the head portion 19.

[0056] In the first position (Figure 3), the head part is pulled as far as possible towards the shaft 2, so that the person operating the tool 1 can have a good view of the screw head - both with manual and motor drive.

[0057] In the second position, the head part 19 is pushed away from the axial end of the shaft 2 of the drilling and / or screwing tool 1 by a certain distance (a few millimeters of travel are provided for axial mobility), so that the head part 10 forms the end that projects furthest forward axially and thus comes into contact with a screw 20 or a similar working tool before an inserted bit 17, 18 does.

[0058] The head portion 19 is not rotationally fixed to the torque-transmitting unit 7, but can be secured against axial withdrawal by the retaining means (balls 21) that can rotate in the groove 25 of the unit 7. Although it can rotate around the unit 7, it can also rotate around the unit 7. Therefore, for example, when screwing a screw 20 into solid material, the head portion 19 can initially rotate with the unit 7 and the bit 17, 18, but stops rotating when the screw head is flush with the material and the head portion 19 thus touches the material. This has the advantage that the surface of the material is not damaged.

[0059] In a further version according to Figure 15, an outer pressure element 27 is provided which applies force to the holding means 8, for example balls, in radially inward direction during use.

[0060] This is formed here by a sliding sleeve that can be axially displaced by only a few millimeters and is secured against axial withdrawal by at least one circlip 27a. This sliding sleeve 27 can exert a high radial force on the retaining means 8.

[0061] The sliding sleeve 27 has cutouts 31 on its inner side. Thus, a slight axial displacement of the sliding sleeve 27 may be sufficient to position the retaining means 8 in the inner cutouts 31 of the sliding sleeve 27. These are then released to such an extent that a torque-transmitting unit 6, 7 that would otherwise be held in place can be easily removed.

[0062] On the other hand, the pressure element 27 can be held in its axial position by a spring-loaded retainer 28 in a position that presses the retaining means 8 radially inwardly, either indirectly (for example, via underlying spring washers 9, 10) or directly. This comprises a radially outwardly biased spring and must therefore be released manually, for example, with the fingertip, so that accidental release of the pressure element is impossible. List of reference symbols:

[0063] Drilling and / or 19 head part,

[0064] Screwing tool, 20 screws,

[0065] Shaft, 21 holding means of the head part,

[0066] Receiving channel, 22 Slot, axial end, 23 Magnet, axial end, 24 Magnet, torque transmitting unit, 25 Fillet, torque transmitting unit, 26 Annular gap holding means, 27 Pressure element,

[0067] Spring cuff, 27a circlip,

[0068] Spring cuff, 28 spring-loaded safety device,

[0069] Groove, 29 replaceable

[0070] Groove, torsion element,

[0071] Hexagon socket, 30 retaining ring,

[0072] Hexagon socket, 3 1 free cut

[0073] Stop,

[0074] recording room,

[0075] Bit,

[0076] Bit,

Claims

Claims:

1. Drilling and / or screwing tool (1) with an axially extending shaft (2) and with an axial inner receiving channel (3) which has a rotation-proof insertion option for a torque-transmitting unit (6;7) at each of two axially opposite ends (4;5), characterized in that at least one insertion option has holding means (8) which project radially inwards and can be pressed inwards from the radial outside by means of spring force and / or by means of an outer pressure element (27) exerting a force radially inwards, for axially securing the position of at least one torque-transmitting unit (6;7).

2. Drilling and / or screwing tool (1) according to claim 1, characterized in that the holding means (8) are designed as balls.

3. Drilling and / or screwing tool (1) according to one of claims 1 or 2, characterized in that spring sleeves (9; 10) are provided on the outside of the shaft (2) to form a spring force and are arranged axially one behind the other and pre-tensioned for radially pressing in balls.

4. Drilling and / or screwing tool (1) according to claim 3, characterized in that that for the axial securing of the spring sleeves (9; 10) circumferential grooves (11; 12) are provided on the outside of the shaft, the axial length of which corresponds in each case to the axial extension of a spring sleeve (9; 10).

5. Drilling and / or screwing tool (1) according to one of claims 1 to 4, characterized in that the pressure element (27) is formed by an axially displaceable sliding sleeve which is secured against axial withdrawal by at least one circlip (27a).

6. Drilling and / or screwing tool (1) according to claim 5, characterized in that the pressure element (27) can be held in an axial position by a spring-loaded safety device (28) in a position which presses the holding means (8) directly or indirectly radially inwards.

7. Drilling and / or screwing tool (1) according to one of claims 1 to 6, characterized in that at least three holding means (8) for an inserted torque-transmitting unit (6;7) are arranged distributed over the circumference.

8. Drilling and / or screwing tool (1) according to one of claims 1 to 7, characterized in that that the anti-rotation insertion possibility forms a hexagon socket (13; 14) or another driving profile such as a star shape or a twelve-sided socket at least in its axially outer edge region.

9. Tool (1) according to claim 8, characterized in that one hexagon socket (13) has an internal dimension of 10 millimeters and another hexagon socket (14) has an internal dimension of 13 millimeters.

10. Drilling and / or screwing tool (1) according to one of claims 1 to 9, characterized in that the shaft (2) has, in the axially central region of the receiving channel (3), a stop (15) effective from each axial side for an engaging torque-transmitting unit (6;7). 1 1. Drilling and / or screwing tool (1) according to one of claims 1 to 10, characterized in that the drilling and / or screwing tool (1) can be connected axially at one end of its shaft (2) via a first torque-transmitting unit (6) to a motor shaft of a drive and this first torque-transmitting unit (6) is recessed in its radially inner region to form a receiving space (16).

12. Drilling and / or screwing tool (1) according to claim 11, characterized in that the drilling and / or screwing tool (1) can be connected to a drill, bit (16; 17) or similar insert tool at its shaft (2) at the other axial end via a second torque-transmitting unit (7), and in that the second torque-transmitting unit (7) can be equipped with such an insert tool at each of its two axial ends and, when thus equipped, can be inserted into the shaft (2) in two differently turned positions, wherein the insert tool can engage in the receiving space (16) of the first torque-transmitting unit (6).

13. Drilling and / or screwing tool (1) according to one of claims 1 1 or 12, characterized in that the first torque-transmitting unit (6) is provided with an elastically deformable torsion element (29) which, when inserted into the shaft (2), establishes the torque-transmitting contact therewith.

14. Drilling and / or screwing tool (1) according to claim 13, characterized in that the torsion element (29) can be pushed onto the first torque-transmitting unit (6) and is replaceable.

15. Drilling and / or screwing tool (1) with an axially extending shaft (2) and with an axial inner receiving channel (3) which has a rotation-proof insertion possibility for a torque-transmitting unit (6;7) at two axially opposite ends (4;5), characterized in that a head part (19) can be placed on at least one of the torque-transmitting units (7), which head part is provided with a magnetic force pointing axially outwards from the drilling and / or screwing tool (1) and can hold a screw (20) or similar working means above it.

16. Drilling and / or screwing tool (1) according to claim 15, characterized in that the head part (19) can be placed on the torque-transmitting unit (7) in two positions of this unit (7) turned by 180° to one another and in the second position is pushed off a short distance by the drilling and / or screwing tool (1) so that it forms the end projecting furthest axially to the front and thus comes into contact with a screw (20) or a similar working means before an inserted bit (17; 18) does.

17. Drilling and / or screwing tool (1) according to one of claims 15 or 16, characterized in that the head part (19) in the mounted position is axially displaceable by several millimeters relative to the torque-transmitting unit (7) carrying it.

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