EP0968793B1 - Variable fastening and/or drilling tool - Google Patents

Abstract

The shank (2) on its free end (20) is formed as a stepped hexagon (21,22). The sleeve-form shank extension (3) is formed with a stepped hexagonal inner contour (31,32) with different diameters on respective sides of the shank extension. The tool insert holder (4) is constructed externally and internally with a hexagonal contour (42,45). It has a collar or base in its longitudinal centre, acting as a stop for two tool inserts fitted from the two respective ends.

Description

The present invention relates to a variable screw and / or Drilling tool consisting of a manual or mechanically driven shaft, a sleeve-shaped, connectable to the free end of the shaft Shaft extension and at least one tool holder, the one with the shaft extension and on the other hand with at least one tool insert is non-rotatably connectable.

A tool of the type mentioned is out EP 0 743 142 A1 is known. With this known tool are on the tool insert holder on one side a screwdriver bit and on the other side a drill held as tool inserts, whereby by turning the Tool holder optionally one or the other of the two tool inserts in the use position can come. For the torsion-proof connection between the Tool holder and the shaft extension is an adjustable one on the outside of the shaft extension Locking sleeve provided, which is disadvantageous for a substantial Increase the diameter of the tool worries what problems when using the tool in leads to limited space. In addition, the operating effort for the people using the tool disadvantageously high here. Finally, is a disadvantage to state that the tool bit holder is a complicated one Form has a high for their production Processing effort is required. This leads overall too high manufacturing costs for the tool what results in a correspondingly high price. Moreover is the use of this well known tool on the two tool inserts held in the tool holder limited; the tool can perform further functions don't take over.

EP 0 744 251 A2 describes a manually operated one Known screwdriver, in which a shank made by on both ends, starting with a part of it Length is hollow, twist-proof with a screwdriver handle is connectable. In both ends of the shaft one tool insert holder can be used in each two screwdriver bits can be used. The screwdriver bits are designed as double bits with two screwdriver blades. By turning and inserting Shank, tool holder and tool inserts can use one of a total of eight possible screwdriver blades be brought into use. The disadvantage is this known tool is not a mechanical drive possible. In addition, there is only twisting with this tool possible from screws to the existing screwdriver bits fit; further screw functions or a drilling function are not available with this tool.

Therefore, for the present invention Task, a variable screwing and / or drilling tool of the type mentioned at the beginning to create the listed Avoids disadvantages and in particular the individual parts simply constructed and therefore inexpensive can be produced with as many screw and / or Drilling functions are executable and its operation is simple.

• daß der Schaft an seinem freien Ende als abgestufter Sechskant mit vom freien Schaftende her gesehen einem ersten, kleineren Durchmesser d₁ und einem daran anschließenden zweiten, größeren Durchmesser d₂ ausgeführt ist,
• daß die hülsenförmige Schaftverlängerung mit einer abgestuften Sechseck-Innenkontur mit wenigstens zwei verschiedenen Durchmessern ausgebildet ist, wobei der Durchmesser in einem ersten Bereich der Schaftverlängerung das Maß d₁ und in einem zweiten Bereich der Schaftverlängerung das Maß d₂ aufweist, und
• daß der Werkzeugeinsatzhalter außen und innen mit einer Sechseckkontur ausgeführt ist, wobei die Sechseckkontur außen das Durchmessermaß d₂ und die Sechseckkontur innen ein kleineres, einschlägigen Normen für Werkzeugeinsätze, insbesondere Schrauber- und/oder Bohrerbits, entsprechendes Durchmessermaß d_B aufweist.

This object is achieved according to the invention by a variable screwing and / or drilling tool of the type mentioned at the outset, which is characterized in that

• that the shaft is designed at its free end as a stepped hexagon with a first, smaller diameter d ₁ and an adjoining second, larger diameter d ₂ seen from the free shaft end,
• that the sleeve-shaped shaft extension is formed with a stepped hexagonal inner contour with at least two different diameters, the diameter having the dimension d ₁ in a first region of the shaft extension and the dimension d ₂ in a second region of the shaft extension, and
• that the tool insert holder is designed on the outside and inside with a hexagon contour, the hexagon contour outside having the diameter dimension d ₂ and the hexagon contour inside having a smaller, relevant standard for tool inserts, in particular screwdriver and / or drill bits, corresponding diameter dimension d _B.

The individual parts of the tool are advantageously simple in their shape and therefore inexpensive to manufacture. There are no movable ones for their connection to each other Locking means, e.g. a locking sleeve, required, which is also an inexpensive Producibility contributes and what simplifies operation. Due to the specified design of the free End of the shaft and the shaft extension in addition to holding screwdriver and / or drill bits the beneficial way of shanking alone to use as an Allen key or the shaft extension in two different positions as an external hex wrench according to Art to use a nut. In the shaft extension inserted tool holder can this if no screwdriver or drill bit is used as another Hexagon wrench with one of the free end of the shaft deviating wrench size be used. So the screw and / or Drilling tool according to the invention in its simplest Design a total of six functions by using of additional tool inserts if necessary can be increased.

A further development of the invention provides that the stepped hexagonal inner contour of the sleeve-shaped shaft extension is formed with three different diameters, the diameter being the smallest dimension d ₁ in a first, central region of the shaft extension and the larger dimension in a second end region of the shaft extension Dimension d ₂ and in a third, opposite end region of the shaft extension has an even larger dimension d ₃ . This gives the shaft extension an end with a larger hexagon dimension, which allows more practical dimension combinations for some applications. At the same time, the ability of the shaft extension to be plugged together with the shaft and with the tool insert holder remains unaffected.

It is also provided that the tool bit holder inside a collar or bottom in its longitudinal center Stop for two from the two end faces of the holder has insertable tool inserts. In this way is always a defined position of the screwdriver or drill bits ensures that in the tool bit holder are used. It also becomes the tool holder stable and highly resilient in itself, so that even high torques can be transmitted without damage can.

In order to screwdriver or To attach drill bits in the tool bit holder, it is proposed that the tool holder with at least one permanent magnet for magnetic mounting is equipped with tool inserts.

So that the individual parts of the screw and / or Drilling tool not inadvertently when used can separate, it is further provided that outside on the free shaft end and on the tool insert holder as well as interacting on the inside of the shaft extension, detent elements that can be released by applying tensile force are provided.

The locking elements mentioned above are preferred spring-loaded locking balls or cams on the one hand and suitably contoured and positioned notches on the other hand formed; alternatively, the locking elements by a spring clip on the one hand and a matching one contoured and positioned, all-round locking recess on the other hand.

Instead of mechanically acting locking elements can a magnetic connection can also be used. Therefor are useful at the free shaft end and / or at the Shaft extension and / or permanent magnets on the tool holder provided as a locking means.

In order to be able to use the screwing and / or drilling tool as expediently as possible, the above-mentioned dimensions d ₁ and d ₂ and optionally d ₃ hexagon socket standard dimensions preferably correspond. The dimensions can be selected according to the intended use of the screwing and / or drilling tool in such a way that the most frequently required dimensions are used.

For the simplest possible coupling of the screw and / or Drilling tool with a drive machine is preferred the shaft at its drive end with a standard contour for mounting in a screwdriver quick chuck executed. These standard contours are usefully from known embodiment, as specified in claims 8 and 9, around the screwing and / or drilling tool according to the invention with common and with craftsmen or do-it-yourselfers connect existing drive machines can.

For cases in which a motorized drive is not possible or is required, the shaft can be attached to its Drive end have a screwdriver handle with which the tool can be operated manually.

A further training of the last mentioned execution provides that the screwdriver handle for storage tool inserts with a cavity, which can either be locked or opened.

Figur 1

ein Schraub- und/oder Bohrwerkzeug in perspektivischer Ansicht und in auseinandergezogener Dar-stellung seiner Einzelteile in drei verschiedenen Ausführungen,

Figur 2

das Werkzeug in zusammengesetztem Zustand in einem Längsschnitt und

Figur 3

eine Schaftverlängerung als Teil des Werkzeuges in einer gegenüber Figur 2 geänderten Ausführung, ebenfalls im Längsschnitt.

Embodiments of the invention are explained below with reference to a drawing. The figures in the drawing show:

Figure 1

a screwing and / or drilling tool in a perspective view and in an exploded view of its individual parts in three different versions,

Figure 2

the tool in the assembled state in a longitudinal section and

Figure 3

a shaft extension as part of the tool in a modified version compared to Figure 2, also in longitudinal section.

Figure 1 of the drawing shows from top right to left The individual parts are drawn in succession below a screwing and / or drilling tool 1 in a first Execution. A shaft 2 is shown at the top right, the one overhead drive end 24 and one of them facing away free end 20. The drive end 24 is in the embodiment of the shaft shown here 2 as standard contour 25 for connection to a screwdriver quick chuck performed in a known manner.

The free end 20 of the shaft 2 is composed two hexagon sections 21, 22, being at the extreme end the hexagon section 21 with a smaller diameter and towards the connection end 24 following the Hexagon section 22 with a larger diameter lies. The diameter of the two hexagon sections 21, 22 suitably correspond to common hexagon wrench dimensions, for example 8 mm and 10 mm. In the course of the smaller hexagon section 21 is also a pressure ball in one of the outer surfaces 23 arranged for the latching connection of the shaft 2 with a shaft extension shown below on the left 3 serves.

The shaft extension 3 is sleeve-shaped with a cylindrical Outside surface and with a stepped hexagon inner contour 31, 32 with two different diameters educated. The diameter of the inner contour 31 corresponds to the diameter of the hexagon section 21 of the shaft 2; the hexagon inner contour 32 at the other end of the shaft extension 3 corresponds to in their diameter the diameter of the larger hexagon section 22 on the shaft 2. In this way the Shaft extension 3 both in one direction and also attached to the shaft 2 in the other direction and with this easily by means of the locking ball 23 be releasably connected.

Further down to the left is the shaft extension 3 a tool insert holder 4, in which two tool inserts 5, 5 ', here two screwdriver bits, are sustainable. The tool holder 4 is both outside and inside with a hexagon contour 42, 45. The diameter of the outer hexagon contour 42 corresponds to the diameter of the hexagon inner contour 32 of the shaft extension 3 and the diameter of the larger hexagon section 22 on the shaft 2. The diameter of the inner hexagon contour 45 of Tool holder 4 corresponds to a common standard dimension for the hexagon sections 55, 55 'of the screwdriver bits 5, 5 '. Also on the tool holder 4 is in a pressure ball 43 is arranged on one of its outer surfaces, for the locking and easily detachable connection of the Tool holder 4 with the shaft extension 3 serves. For detachable connection of tool inserts 5, 5 'with the tool holder 4 is what is in this Figure 1 is not visible, at least one permanent magnet appropriate.

On the right in Figure 1 is a modified version of the Shaft 2 shown, which differs from the previously described Shaft 2 differs only in that now Drive end 24 as SDS shaft 25 'for connection to a correspondingly designed drill chuck is. In its remaining parts, the one on the right is correct 1 shown shaft 2 with the previously described Shaft 2 match.

Finally, at the top left in FIG. 1 is a third embodiment of the shaft 2, in which the drive end 24 is provided with a screwdriver handle 25 '' the manual actuation of the shaft 2 and, if necessary associated additional tool parts possible is. The free end 20 of the left in Figure 1 Shaft 2 shown above corresponds to that above already described execution.

The tool 1 shown as an example in FIG. 1 leaves with the parts shown in six different Use screw functions. In a first screw function only the shaft 2 is used, in which case whose hexagon section 21 as a wrench for Allen screws can be used. If additional the shaft extension 3 in its first direction is connected to the shaft 2, the Shank 2 facing hexagon inner contour as a wrench for hexagon screws or nuts of the corresponding Size can be used. A second wrench function arises as soon as the shaft extension 3 turned and in the opposite direction with the Shaft 2 is connected.

A fourth screw function is achieved when the tool bit holder 4 without tool inserts 5, 5 'with the Shaft extension 3 is connected. The outer hexagon contour 42 then forms a second wrench for hexagon socket screws, which has a larger dimension than the hexagon section 21 on the shaft 2. Die third and fourth screw function of the tool 1 is finally achieved by both sides of the tool bit holder 4 each one tool insert 5, 5 ' is used, which is then optionally by appropriate Insert or turn and reinsert in use position can be brought.

Figure 2 of the drawing shows the complete tool 1 in the assembled state of its parts in a longitudinal section. Above the shaft 2 can first be seen with its upper drive end 24 with the standard contour 25 for connection to a screwdriver quick-action chuck. The shaft 2 merges downwards at its free end 20 into the larger hexagon section 22 and the smaller hexagon section 21. The diameter of the smaller hexagon section 21 is d ₁ , the diameter of the larger hexagon section 22 is d ₂ .

In the smaller hexagon section 21 is the spring-loaded Push ball 23 housed with a the inside of the subsequent shaft extension 3 provided recess 34 is engaged. The twist-resistant connection between the shaft 2 and the Shaft extension 3 takes place via the form-fitting Engagement between the hexagon section 21 and the Hexagon inner contour 31 of the shaft extension 3.

As illustrated in FIG. 2, the inner contour of the shaft extension 3 is graduated, the diameter of the hexagonal inner contour 31 being smaller and having the dimension d ₁ over the upper, larger part of the length of the shaft extension 3, while in the shorter, lower part of the shaft extension 3 the hexagonal inner contour 32 has the larger diameter d ₂ .

The tool insert holder 4 is inserted into the part 32 of the shaft extension 3 with the larger diameter d ₂ , the hexagon outer contour 42 of which also has the dimension d ₂ , so that a form-fitting connection is possible. The spring-loaded pressure ball 43, which is arranged in one of the outer surfaces of the tool insert holder 4 and which, in the assembled state shown here, engages with a recess 34 on the inside of the shaft extension 3, serves for releasably fixing the tool insert holder 4 in the shaft extension 3.

In the center of the tool insert holder 4, a continuous intermediate floor 40 is visible, in the area of which the pressure ball 43 is also provided. A permanent magnet 41 is arranged, for example pressed or glued, on either side of the base 40, which serves to magnetically hold tool inserts, for example screwdriver bits, not shown here. To hold the tool inserts, the tool insert holder 4 has a receiving opening with a hexagonal inner contour 45 on each of its two end faces, whose diameter dimension d _B corresponds to the diameter dimension of conventional screwdriver bits. A common dimension here is, for example, d _B = 6.35 mm.

FIG. 3 of the drawing shows a shaft extension 3 modified as compared to the embodiment in FIG. 2 as part of the tool 1, just as in FIG. 2 in longitudinal section. The shaft extension 3 is also sleeve-shaped in the embodiment according to FIG. 3 and has a plurality of regions 31, 32, 33 in its interior, as is the case with the shaft extension 3 in FIG. 2, and the shaft extension 3 according to FIG and then upwards the areas 32 and 31 with diameters d ₂ and d ₁ . In contrast to the embodiment according to FIG 2 but the extension shaft of Figure 3 in its upper region 33 has a larger diameter dimension d 3 FIG. ₃ For this purpose, the shaft extension 3 is designed with a larger outer diameter in its upper part, in order to ensure the material thickness required for the force absorption during screwing operations. The dimension d ₃ is both greater than d ₁ and d ₂ . In practice, the dimension d _{1 can be,} for example, 8 mm, the dimension d ₂ 10 mm and the dimension d ₃ 13 mm, as a result of which a combination of the hexagon dimensions of 10 mm and 13 mm which is frequently desired in practice is achieved.

Also in the execution of the shaft extension 3 according to Figure 3, the shaft 2 in the same way as in Figure 2 shown with the shaft extension 3 by simple Plugged in. The lower occurs End of the shaft 2 with its hexagonal outer contour in positive engagement with the area 31 of the Shaft extension 3. The larger hexagon section 22 in the lower part 20 of the shaft 2 lies within the area 33 of the shaft extension 3, without this Area 33 to come into contact.

With the lower end of the shaft extension in the drawing 3 according to Figure 3 can in the same way as in Figure 2 a tool insert holder 4 can be connected or the area 32 of the shaft extension 3 can be used directly as a screwing tool.

Claims (12)

1. Variable screwing and/or drilling tool (1), comprising a shaft (2) that is rotary-actuated in a manual or mechanical manner, a sleeve-shaped shaft extension (3) that can be joined to the free end (20) of the shaft (2) in a torsionally stiff connection, and at least one tool bit holder (4) that can, on the one hand, be joined to the shaft extension (3) and, on the other hand, to at least one tool bit (5, 5') in a torsionally stiff connection, characterized in that

   the shaft (2), at its free end (20), is designed as a stepped hexagon (21, 22) with, as seen from the free shaft end (20), a first smaller diameter d₁ and a second greater diameter d₂ adjacent thereto;

   the sleeve-shaped shaft extension (3) comprises a stepped inner hexagon contour (31, 32, 33) with at least two different diameters, with the diameter having the size d₁ in a first region (31) of the shaft extension (3) and the size d₂ in a second region (32) of the shaft extension (3); and

   the tool bit holder (4) is designed with a hexagon contour (42, 45) both inside and out, with the outer hexagon contour (42) having the diameter size d₂ and the inner hexagon contour (45) having a smaller diameter size d_B corresponding to the pertinent standards for tool bits, in particular for screwdriver and/or drill bits.
2. Screwing and/or drilling tool according to claim 1, characterized in that the stepped inner hexagon contour (31, 32, 33) of the sleeve-shaped shaft extension (3) is designed with three different diameters, with the diameter having the smallest size d₁ in a first central region (31) of the shaft extension (3), the greater size d₂ in a second front-face region (32) of the shaft extension (3), and a still greater size d₃ in a third region (33) of the shaft extension (3) that is arranged opposite to the front-face region.
3. Screwing and/or drilling tool according to claim 1 or 2, characterized in that the tool bit holder (4), in its longitudinal middle, comprises an internal collar or bottom (40) serving as stop for two tool bits (5, 5') that can be inserted from either front face of the holder.
4. Screwing and/or drilling tool according to one of the preceding claims, characterized in that the tool bit holder (4) is equipped with at least one permanent magnet (41) for holding the tool bits (5, 5') magnetically.
5. Screwing and/or drilling tool according to one of the preceding claims, characterized in that, outside, interacting detent elements (23, 43; 34) are provided at the free shaft end (20) and at the tool bit holder (4) as well as, inside, at the shaft extension (3), with these detent elements being removable by applying pulling force.
6. Screwing and/or drilling tool according to claim 5, characterized in that the detent elements are, on the one hand, formed by spring-loaded detent balls or detent cams (23, 43) and, on the other hand, by detent recesses (34) having the appropriate contour and being arranged at the appropriate position or that the detent elements are, on the one hand, formed by a resilient buckle and, on the other hand, by a circumferential detent recess having the appropriate contour and being arranged at the appropriate position.
7. Screwing and/or drilling tool according to one of the preceding claims, characterized in that permanent magnets are provided as catching devices at the free shaft end (20) and/or at the shaft extension (3) and/or at the tool bit holder (4).
8. Screwing and/or drilling tool according to one of the preceding claims, characterized in that the sizes d₁ and d₂ and, if necessary, d₃ comply with standard hexagon socket sizes.
9. Screwing and/or drilling tool according to one of the preceding claims, characterized in that the shaft (2), at its actuated end (24), comprises a standard contour (25, 25') for being held in a screwdriver quick-action chuck.
10. Screwing and/or drilling tool according to claim 9, characterized in that the standard contour is a 6.35-mm hexagon (25) with a locking recess or is an SDS shaft (25').
11. Screwing and/or drilling tool according to one of claims 1 to 8, characterized in that the shaft (2), at its actuated end (24), comprises a screwdriver handle (25").
12. Screwing and/or drilling tool according to claim 11, characterized in that the screwdriver handle (25") comprises a hollow space for the storage of tool bits (5, 5'), that can either be closed or opened.

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