WO2007115688A9

WO2007115688A9 - Screwing device for screwing in screws

Info

Publication number: WO2007115688A9
Application number: PCT/EP2007/002749
Authority: WO
Inventors: Karl Heinz Gast
Original assignee: Karl Heinz Gast
Priority date: 2006-04-08
Filing date: 2007-03-28
Publication date: 2008-02-07
Also published as: DE102006016920A1; WO2007115688A3; WO2007115688A2

Abstract

The invention relates to a device (1), which can be fixed to a screwing device, for screwing in screws, comprising mainly an essentially rod-shaped screwing tool (4) and a screw holder (2) that is mounted in an axially displaceable manner relative to the screwing tool (4) and is fixed in the radial direction. The screw holder carries at the end opposite the screwing tool (4) at least one guiding element (16, 16a) which is axially fixed to the screw holder (2) and radially in relation to the longitudinal centre axis (11) of the screwing tool (4) and which delimits a receiving channel (17) that extends in the direction of the longitudinal centre axis (11) and in which the shank of a screw (18) can either be positioned in alignement with the longitudinal centre axis (11) or that said shaft is axially guided during the initial phase of the screwing process. At least one longitudinal section of the screw holder (2) carrying the guiding element (16) is rotatably mounted around the longitudinal centre axis (11).

Description

description

EinrichtungzumEindrehenvonSchrauben

The invention relates to a fixable to a screwdriver, such as a cordless screwdriver means for screwing screws, with a substantially stabfόπnigen Schraubwerk- tool, and a relative to the screw axially movable mounted and fixed in the radial direction screw holder. The screwing tool usually carries at its free or operating end a so-called bit, which engages in the screw head in a torque-locking manner. A screw to be screwed into a material or a predrilled hole is only slightly fixed on the actuating end or on a bit, so that it must be held by the operator of a screwdriver at the beginning of the screwing procedure with one hand. In order for the pressure required for screwing in to be able to be exerted on a screw, it must be held in such a way that it is aligned with the screwing tool or with its central longitudinal axis. But there is a risk that the screw kinks at a transverse load and the operator injured. From DE 298 05 902 DE a device is known, in which a screw rests with a longitudinal section adjoining its head in a sleeve connected to a screwing tool, wherein the inner diameter of the sleeve is adapted to the diameter of the screw. The device is therefore only suitable for screws with a specific shaft diameter and, moreover, only for those screws whose head does not protrude radially beyond the shaft. Based on this, the present invention seeks to propose a tool holder, which ensures a safe and stable tilt mounting of the screw with a simple design and which can be used for a variety of different Schraubengrδßen.

This object is achieved according to claim 1, characterized in that the screw holder is fixed in the radial direction and that its end facing away from the screwing tool carries at least one guide element, which with respect to the central longitudinal axis of

Screwing tool is radially and axially fixed to the screw holder, and which defines a extending in the direction of the central longitudinal axis receiving channel in which the shaft of a screw with an alignment to the central longitudinal axis alignment both positionable and axially feasible during the initial phase of the screwing. Such a device has the advantage that during the initial phase of the screwing process it ensures a buckling-resistant or axially aligned mounting of screws with different shaft diameters. A aligned to the central longitudinal axis of the screwing position of the screw is ensured on the one hand by their inclusion in the receiving channel and the other by the fact that the guide element is radially fixed to the screw holder. The screw holder or a longitudinal section of the screw holder carrying the guide element is preferably rotatably mounted about the central longitudinal axis. This ensures that the screw holder, e.g. can be held at the beginning of the screwing to attach the screw at a predetermined location can.

In a first preferred embodiment, the at least one guide element is designed such that it has a _S screw with a radially inwardly directed clamping force on at least two axially spaced apart clamping areas holds. Preferably, this is achieved in that the at least one guide element against a radially inwardly directed biasing force by a screw inserted into the receiving channel is radially yielding or compressible. The diameter or the clear width and the preload force can be chosen so that screws with different shank diameters are securely held with axial alignment. The restoring forces required to hold a screw can be realized with the help of one or more of an elastic material guide elements in a particularly simple and cost-effective manner. But also conceivable are guide elements, which are formed from radially inwardly spring-loaded, approximately plate-like elements.

In order to allow easy replacement of a bit, in a preferred embodiment, an opening is present laterally in the screw holder, which opens into an interior of the screw holder receiving the screwing tool. The insertion of a screw in the screw holder is achieved in a preferred embodiment in that in the receiving channel a radially outwardly and over the entire length of a guide element extending insertion channel opens whose inside width is less than the inside diameter of the receiving channel or an existing there holding area. Through this channel, a screw can be easily inserted into the screw holder.

A fundamentally different mounting of a screw is present in a further preferred exemplary embodiment the at least one guide element is formed by one or more magnets. A first embodiment variant provides that a guide element has an axially extending, pointing to the central longitudinal axis side on which a magnetic or magήetisierbare screw by magnetic attraction forces in axial alignment can be fixed. It is conceivable that a groove forming a receiving channel for a screw is present in said side.

In a further advantageous embodiment variant, there are a plurality of axially extending magnetic guide elements distributed in the starting direction of the screw holder, which are arranged and designed such that they hold a magnetic screw in a alignment aligned with the central longitudinal axis of the screwing tool without contact in a receiving channel surrounded by them. The magnets are poled and aligned so as to repel a magnetic screw and thereby maintain it in a centered, axially aligned position in the receiving channel bounded by it. The advantage of this embodiment is, above all, that screws are guided without contact during screwing in and thus wear-free. The screws do not have to be magnetic by nature. It is sufficient that they consist of a magnetizable material, if, as provided in a preferred variant, the actuating end of the screwing tool contains a magnetic element, for example in the form of a magnetic bit.

Even with magnetic guide elements, it may be expedient if they are mounted on the screw holder so that they are radially outwardly movable against a radially inwardly acting force. So it is conceivable that magne- Table Führungselβmente define a receiving channel so that although a shaft of a screw, but not their head finds room in it. Due to the above-mentioned embodiment, however, the guide element can yield radially apart during the advancement of the screw in the course of the screwing-in process, so that the screw head can pass.

Characterized in that the screw holder has an end face which faces away from the screwing tool and which extends transversely to the central longitudinal axis of the screwing tool, a screwdriver, for example a cordless screwdriver, can be supported on the surface of a workpiece so as to be stable against tilting.

Although guide elements are mounted radially movable, it may be useful if the receiving channel bounded by them is variable, for example, to facilitate the insertion of a screw or adjust the acting on a screw shaft clamping forces of the guide elements. A preferred embodiment provides that a Püh- approximately element is mounted in the screw holder that its radial position, in the simplest case by a radially oriented screw, is adjustable.

In a further preferred embodiment, a Grundkόr- is provided by, which holds the screwing and the to

Fixing the device is used in a chuck of a screwdriver. In this case, the screw holder is axially movable and rotatably fixed to the base body. The rotatability of the screw holder can also be achieved by virtue of the fact that it can be turned from a first longitudinal section which is non-rotatably connected to the main body and a second, which has at least one guide rail. supporting member, with the first longitudinal portion rotatably connected second longitudinal portion is formed.

The invention will now be explained in more detail with reference to the accompanying drawings. Show it:

1 shows a schematic longitudinal section through a first embodiment of a device for screwing in screws, FIG. 2 shows a side view of the region II of FIG. 1,

Fig. 3 is a plan view in the direction of the arrow III in Fig. 1, Fig. 4 is a schematic longitudinal view of a second embodiment of a device for screwing a screw.

The devices 1 shown in the figures comprise a screw holder 2, a base body 3 and a screwing tool 4. The screw holder 2 is in each case designed as a sleeve which is plugged onto the base body 3 in the axial direction, this being designed essentially as a cylindrical part. The one end 5 of the main body 3 carries in each case the screwing tool 4, wherein the other end 6 in a chuck of a screwdriver, for example a cordless screwdriver (both not shown) can be clamped.

In the embodiment of FIG. 1, the sleeve-shaped screw holder 2 is fitted with a precise fit onto the end 5 of the base body 3 in such a way that an axial mobility in the direction of the central longitudinal axis 11 of the base body or the screwing tool 4 as well as a rotation around the mentioned

Axis is guaranteed. At the end face 7 of the screw holder 2 facing the main body 3, it is supported by rule position of an annular disc 8, a helical compression spring 9 with its one end. The other end of the helical compression spring 9 is supported on a screw ring 10 comprising the main body 3. The screwing tool 4 carries at its end remote from the base body 3 actuating end 12 a bit 13. The other end of the screwing 4 is in a central axially extending receptacle 14 of the body 3 a torque-locking and is there in the axial direction by spring elements 15, for example leaf springs made of spring steel, held.

The end of the screw holder 2 facing away from the main body 3 carries two guide elements 16. These are, as can also be seen in FIG. 3, formed as halbzylinderfδrmige parts which are fixed with their concave outer sides on the inner side of the screw holder 2. The guide elements 16 define an extending in the direction of the central longitudinal axis 11 receiving channel 17 for a screw 18. The diameter 19 of the receiving channel 17 is dimensioned so that it can be expanded radially outwardly by a screw 18 inserted therein. The radial expandability is given by the fact that the guide elements are made of a material which is compliant at least in the radial direction, namely an elastomer material. The screw inserted in the receiving channel 17 is held in a position by the elastic restoring forces of the guide elements 16 in which it is aligned in the direction of the central longitudinal axis 11. In this position, it is also, at least to some extent, held when the device 1 and the screw 18 in the transverse direction, that is loaded transversely to the central longitudinal axis 11. The tilt-stable mounting of a screw is greater, the longer the receiving channel 17 and the clamping area formed by it is. It is conceivable that the guide elements 16, the screw 18 at hold two axially spaced clamping portions 29 (shown in phantom in Fig. 1).

Starting from approximately the situation shown in Fig. 1, the device 1 is mounted on a workpiece (not shown), in which a screw 18 is to be screwed. Here, the screw holder 2 is supported with its the base body 3 facing away from the end face 20 on the workpiece, whereby a tilt stabilization of the device 1 and a screwdriver is guaranteed. When a screwdriver and thus held by this body 3 is moved in the screw 22, the base body 3 is further advanced with its end 5 in the interior 21 of the screw holder 2, wherein the helical compression spring 9 is compressed. When advancing the screwing 4 thus the spring force of the helical compression spring 9 must be overcome. This force is with the screw ring 10 which cooperates with an external thread (not shown) of the Grundkδrpers 3, adjustable. In the course of screwing the screw is moved in the screw 22, so that their screw head 23 and ultimately also the screwing 4 are inserted into the receiving channel 7, whereby this elastically expands radially. Depending on how tight the torque between Bit 13 and screw head 23, the further the screw 18 can be screwed into a material. By changing the bias of the helical compression spring 9, the strength of said torque closure can be changed. When screwing the screw holder 2 remains rotationally fixed on the workpiece, which is accomplished by the rotatable connection between it and the base body 3. It is also conceivable, however, that the screw holder 2 is fastened in a rotationally fixed manner to the base body 3. In order to prevent co-rotation of the longitudinal elements supporting the guide elements 16 during the screwing operation. _S chnitts 24 to prevent this is rotatably connected in an alternative embodiment with a second, connected to the base body 3 longitudinal portion 25. A corresponding rotatable connection is indicated in Fig. 1 by the dashed line 26.

Laterally in the guide elements 16 supporting region of the screw holder 2, an opening 27 is provided, via which the interior 21 of the screw holder 2 is accessible, for example, to replace a bit 13 or the entire screwing 4. The opening 27 extends with a narrowed portion 28 to the end face 20 of the screw holder 2. In the area 28, the guide elements 16 are thus accessible from the outside. They include between them an over their entire length and radially extending insertion channel 29 a. Its clear width 30 is less than the diameter 19 of the receiving channel 17. About the insertion channel 19, a screw 18 can be inserted into the receiving channel 17. It is also conceivable that a screw 18 is used approximately corresponding to arrow 38 (Fig. 2) in the receiving channel.

In the embodiment shown in Fig. 4, the Grundkδrper 3 at its end 5 a central, radially narrowed projection 32, on which the screw holder 2 is mounted axially fixed. The projection 32 is penetrated centrally by a receptacle 14 a, in which the screwing 4 is inserted torque-tight and axially fixed. The axial fixation via a magnet 39. In the receptacle 14 a further a helical compression spring 33 is present, which is supported on the one hand on the screw 4 and the magnet 39 and on the other hand on an adjusting screw 34. To adjust the bias of the helical compression spring 3 = 3 is the Adjusting screw 34 accessible via an opening 35 on the base body 3.

A plurality of bar magnets extending in the axial direction 5 and enclosing therebetween a receiving channel 17a with the same polarity (for example N-PoI facing the screwing tool 4, S-PoI facing away from the screwing tool) are present as guide elements 16a. A screw 10 located in the receiving channel 17a, which is poled in the same way as the guide elements 16a, is repelled by these and centered in the receiving channel. However, a screw does not have to be magnetic by nature; it is sufficient if it consists of a magnetizable material, for example of a ferromagnetic material. The magnetization of the screw in a manner corresponding to the magnetic guiding elements is effected by a magnetic element 40 which is integrated in the actuating end 12 of the screwing tool. The magnetic element 40 may also be formed by a bit 13. The clear width of the receiving channel 17a is dimensioned such that the screwing tool 4 and therefore a correspondingly dimensioned screw head 23 pass through. However, the receiving channel 17a may also be narrower when the guide elements are mounted radially movable in the screw holder 2 and can be urged radially outwardly by a passing through him screw head. .5

To insert a screw 18 no lateral opening in the screw holder 2 is required, as in the embodiment described above. A screw 18 is simply inserted from the front side 20 into the receiving channel 17 a inside. (0 An exchange of the screwing tool 4 or a bit 13 takes place via the receiving channel 17a, wherein the screwing tool 4 by means of a (not shown) device in a screwing 22 is moved out of the receiving channel 17a out. It is also conceivable that the screw holder is releasably fixed to the body and is removed for replacing bit 13 or screwing.

In the situation shown in Fig. 4, the coil spring 33 is biased by means of the above-mentioned (not shown) means while the screwing tool 4 is locked. To screw a screw into a workpiece, the screw holder 2 is placed on this with its forehead side 20 so as to be stable against tilting and the abovementioned locking mechanism is released. The required for screwing feed force in the screw 22 is initiated by the helical compression spring 33 in the screw 4, wherein a variation of the spring force by means of the adjusting screw 34 is possible. Due to a rotatable connection between the projection 32 and the screw holder 2 makes this the rotation of the Grundkδrpers 3 when screwing a screw not with. Of course, a rotational fixation with respect to the workpiece can also be achieved by virtue of the fact that, as in the exemplary embodiment described above, the screw holder 2 consists of two longitudinal sections rotatably connected to one another. As an alternative or additional to the axial adjustment of the screwing tool 4 by means of the above-mentioned device, the screw holder 2 can be held axially displaceably on the projection 32. For this purpose, this extends, as indicated by the dashed line 35, over a longer axial section, whereby an axial displacement path 36 is formed. 17

LIST OF REFERENCE NUMBERS

1 device 30 clear width 5 2 screw holder 31 projection

3 main body 35 33 helical compression spring

4 screwing tool 34 adjusting screw

5 end 35 dashed line

6 end 36 displacement

10 7 Front side 37 Clamping area

8 ring disk 40 38 arrow

9 helical compression spring 39 magnet

10 screw ring 40 magnetic element

11 center longitudinal axis 15 12 operating end

13 bits

14 recording

15 spring element

16 guide element 20 17 receiving channel

18 screw

19 diameter

20 front side

21 interior

25 22 Screw-in direction

23 head

24 longitudinal section

25 longitudinal section

26 dotted line 30 27 opening

28 area

29 insertion channel

Claims

12

claims

5 1. On a screwdriver fixable device (1) for screwing in screws, with a substantially Stabfόrmigen screwing tool (4), and relative to the screwing tool (4) axially movably mounted and fixed in the radial direction screw holder (2), wherein this on a the screwing tool 10 (4) opposite end carries at least one guide element (16, 16 a), which is fixed with respect to the central longitudinal axis (11) of the screwing tool (4) radially and axially on the screw holder (2), and the one in the direction of Central axis (11) extending receiving channel (17) bounded in which the shaft 15 of a screw (18) with an alignment to the central longitudinal axis (11) alignment is both positionable and axially feasible during the initial phase of the screwing, and wherein at least one of the guide element ( 16) carrying the longitudinal section of the screw holder (2) about the central longitudinal axis 20 (11) is rotatably mounted.

2. Device according to claim 1, characterized in that the screw holder (2) or a guide element .5 carrying longitudinal portion (25) of the screw holder (2) about the central longitudinal axis (11) is rotatably mounted.

3. Device according to claim 1, characterized in that the at least one guide element (16) is designed so that there is a screw (18) with a radially inward 13 directed clamping force on at least two axially spaced clamping regions (37) holds.

4. Device according to claim 3, 5, characterized in that the receiving channel (17) against a radially inwardly directed biasing force by a screw inserted into it (18) is radially expandable.

10. Device according to claim 4, characterized in that the at least one guide element (16) consists of an elastomer material.

15 6. Device according to one of claims 3 to 5, characterized in that laterally in the screw holder (2) has an opening (27) which opens into a screwing tool (2) receiving the interior space (21) of the screw holder (2).

20

7. Device according to one of claims 3 to 5, characterized in that in the receiving channel (17) extending radially outward and over the entire length of a guide element (16 )-

^» 5 of the insertion channel (29) opens, the clear width (30) is smaller than the diameter (19) of the receiving channel (17) or an existing there clamping region (37).

8. Device according to claim 1, characterized in that at least guide element (16a) is designed as a magnet. 14

9. Device according to claim 8, characterized in that the guide element (16a) has an axially extending, 5 to the central longitudinal axis (11) facing side () to which a magnetic or magnetizable screw can be fixed by magnetic attraction forces in axial alignment.

10. Device according to claim 8,

10 characterized in that a plurality of in the circumferential direction of the screw holder (2) distributed axially extending magnets (16 b) are provided, which are arranged and designed so that they a screw (18) in one to the central longitudinal axis (11) of the Schraubwerk-

Hold 5 pcs (4) in alignment alignment without contact in the receiving channel (17).

11. Device according to one of claims 8 to 10, characterized

0 that one or more guide elements (16) are mounted on the screw holder that radially outwardly against a radially inwardly acting spring force are movable.

12. The device according to claim 1, characterized in that the screw holder (2) has an end face (20) which faces away from the screwing tool (4) and which extends transversely to the central longitudinal axis (11) of the screwing tool (4). )

13. Device according to claim 1, characterized. 15

in that the at least one guide element (16, 16a) is mounted in the screw holder such that its radial position is adjustable.

14. Device according to claim 1, characterized by a screwing tool (4) holding, can be clamped in the chuck of a screwdriver Grundkδrper (3), with which the screw holder (2) is connected.

15. A device according to claim 14, characterized in that the screw holder (2) is fixed axially movable on Grundkδrper (3).

16. A device according to claim 14, characterized in that the screw holder (2) is rotatably fixed to the Grundkδrper (3).

17. A device according to claim 14, characterized in that the screw holder (2) from a first, non-rotatably connected to the base body (3) longitudinal portion (25) and a second, the at least one guide element (16) bearing, with the first longitudinal portion (25) rotatably connected second longitudinal section (24) composed.