Bit Holder For Holding And Screwing A Screw With A Screw Head In A Mounting Base

Abstract

The disclosure relates to a bit holder 1 for holding and driving a screw 3 with a screw head 4 into a fastening base, comprising a clamping region 2 for connecting the bit holder 1 to a driving tool and a bit receptacle 16 for inserting a bit suitable for driving the screw 3. The bit holder 1 has at least one magnet 7a-7f, 7.1a-7.1f arranged eccentrically relative to the bit holder 16 with one pole facing the screw head 4, wherein the magnet 7a-7f, 7.1a-7.1f is held floating on a magnet holder 8, 8.1 in relation to a bit 6 held in the bit receptacle 16, so that the pole face of the at least one magnet 7a-7f, 7.1a-7.1f can align according to the contour of the screw head 4 in order to hold the screw 3 on the bit holder 1 in such a way that the bit 6 engages torque-locked in a rotary driver contour 5 of the screw head 4.

Claims

1. A bit holder for holding and driving a screw with a screw head into a fastening base, comprising a clamping region for connecting the bit holder to a driving tool and a bit receptacle for inserting a bit fitting a screw (3), the bit holder having at least one magnet eccentrically arranged relative to the bit holder with one pole facing a screw head; the magnet being held floating on a magnet holder in relation to a bit and held in the bit receptacle such that a pole face of the at least one magnet can align according to the contour of a screw head in order to hold a screw on the bit holder such that the bit is torque-locked in a rotary driver contour of a screw head.

2. The bit holder of claim lwherein the magnet holder points radially outwards from a longitudinal axis of the bit holder and is elastically deformable for the floating mounting of the magnet

3. The bit holder of claim 1 wherein the magnet is formed as deformable perforated disc on which several magnets are circumferentially distributed .

4. The bit holder of claim 1 wherein the magnet holder has at least one predetermined buckling point (. for providing the floating mounting of the magnet along its circumference.

5. The bit holder of claim 1 wherein the magnet holder is made of an elastomer.

6. The bit holder of claim wherein the magnet holder is held on the bit holder by a housing enclosing the magnet holder (8) at least in sections.

7. The bit holder of claim 6 wherein at least a portion of the housing having a curved inner contour , a curvature being greater than a trajectory of the free end of the magnet holder at least in sections when the magnet is deformed to fit the contour of a screw head.

8. The bit holder of claim 6 wherein the housing is rotatably mounted around a longitudinal axis of the bit holder relative to the bit receptacle.

9. The bit holder of claim 1, wherein the magnet holder) can be moved relative to the bit in a set-up state in a longitudinal direction of the bit holder and is fixed in the longitudinal direction when it is in use.

10. The bit holder of claim 1 wherein there is at least one section with a reduced cross-sectional area between the clamping region and the bit receptacle.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG. 1 is a perspective view of a bit holder,

[0031] FIG. 2 is a side sectional view of the bit holder according to the invention, the magnet holder in a first position

[0032] FIG. 3 is a the bit holder shown in FIG. 2, the magnet holder in a second position holding a screw head,

[0033] FIG. 4 is a first embodiment of a magnet holder, and

[0034] FIG. 5 is a second embodiment of a magnet holder.

[0035] Before explaining the disclosed embodiment of the present invention in detail, it is to be understood that the invention is not limited in its application to the details of the particular arrangement shown, since the invention is capable of other embodiments. Exemplary embodiments are illustrated in referenced figures of the drawings. It is intended that the embodiments and figures disclosed herein are to be considered illustrative rather than limiting. Also, the terminology used herein is for the purpose of description and not of limitation.

DETAILED DESCRIPTION

[0036] FIG. 1 shows a bit holder 1. The bit holder 1 has a clamping region 2, with which the bit holder 1 can be clamped into a driving tool (not shown in detail). In this exemplary embodiment, the clamping region 2 is a hexagonal section. The bit holder 1 is used to drive a screw 3 shown in dashed lines in this figure, having a screw head 4. The screw 3 is to be driven into a fastening base (not shown in detail) by turning the same. For this purpose, the screw 3 has a rotary driver contour 5. A bit 6, which is complementary to engage in the rotary driver contour 5 is inserted into a bit receptacle (not visible in FIG. 1) of the bit holder 1.

[0037] The screw 3 has an overall length of about 300 mm (not shown here in full) and, because of its length, is very heavy. Overall, due to the long lever arm, this causes a high tilting moment on the screw head 4 when the screw 3 is to be held horizontally by the bit holder 1. To hold the screw 3 on the bit holder 1, the bit holder 1 according to the invention has magnets 7a-7f, which are held in a magnet holder 8, which is accommodated in a housing hidden in FIG. 1 and described below, along the circumference of the magnet holder 8. The pole faces of the magnets 7a-7f point towards the screw head 4 of the screw 3 and are arranged eccentrically in relation to the bit 6 (and thus also in relation to the longitudinal extent of the bit holder 1).

[0038] The magnet holder 8 is designed as a perforated disc and has predetermined buckling points 9 (only a single predetermined buckling point is shown in FIG. 1 for the sake of clarity). The predetermined buckling points 9 are incisions in the magnet holder 8 in the radial direction, so that a single magnet holding segment is provided for each magnet 7a-7f. As a result, the magnets 7a-7f are mounted in a floating manner.

[0039] FIGS. 2 and 3 show the same bit holder 1 as in FIG. 1 in a cross-sectional side view. The reference symbols are therefore used identically. FIG. 2 shows the bit holder 1 in an initial position, FIG. 3 while holding the screw 3 or the screw head 4: In FIG. 2, the screw head 4 of the screw 3 and the bit holder 1 are still separate. The bit 6 is surrounded by the magnets 7a, 7d, which are arranged in the magnet holder 8 designed as a perforated disc. If the screw 3—as shown in FIG. 3—is brought up to the bit holder 1, the magnet holder 8 deforms as a result of the efforts of the magnets 7a, 7d to contact the screw head 4, but keeps the magnets 7a, 7d on the bit holder 1. The deformation of the magnet holder 8 is made possible by the predetermined buckling points 9, 9a-9f of the magnet holder 8 shown in FIGS. 1 and 5. The magnets 7a, 7d can thus adapt to the curvature of the screw head 4 in order to produce a magnetic connection via the contact.

[0040] In this way, the screw 3 is not only held on the bit holder 1, but it is also ensured that the bit 6 engages in the rotary driver contour 5 of the screw 3. In addition, the tilting moment acting on the connection between the screw head and the bit holder is supported by the form-fitting engagement of the bit 6 in the rotary driver contour 5.

[0041] The magnet holder 8 is held in a housing 10. The housing 10 has a curved inner contour 11 on the inside. The magnet holder 8 also has a curvature on its outside which corresponds in sections to the curvature of the inner contour 11 of the housing 10. In this way, the magnet holder 8 is guided in the housing 10 or along its inner contour 11.

[0042] The curvature is such that, as can be seen in FIG. 3, further deformation of the magnet holder 8 in the direction of the screw head 4 is prevented in the state shown here, since the outer diameter of the magnet holder 8 abuts the inner contour 11 of the housing 10. The curvature of the inner contour 11 of the housing 10 is thus greater than the trajectory of the free end of the magnet holder 8 when it deforms to adapt to the contour of the screw head 4.

[0043] The housing 10 is positively connected to a connector 12 via a circumferential and rotationally symmetrical undercut 13. It is therefore rotatably mounted relative to the same. The connector 12 has an internal thread 14 which engages in an external thread 15 of the bit receptacle 16. If the connector 12 is rotated in relation to the bit receptacle 16, this is displaced together with the housing 10 of the magnet holder 8 along the longitudinal axis of the bit holder 1. In this way, it is possible to set how far the bit 6 is positioned in relation to the magnets 7a, 7d in the direction of the screw head 4 protrudes. This state is the set-up state. In order to produce a usage state, a counter element 17, likewise with an internal thread 18 and screwed onto the external thread 15 of the bit receptacle 16, is rotated against the connector 12.

[0044] Sections with a reduced cross-sectional area 19, 19.1 are arranged between the bit 6 and the clamping section 2, separated from a section with a larger cross-sectional area 20. The sections with a smaller cross-sectional area 19, 19.1 are twisted when using an impact wrench and thus cushion the impact against the screw 3. Optimally, the section with a smaller cross-sectional area 19 that is arranged closer to the clamping section 2 has a larger cross-sectional area than the section with a smaller cross-sectional area 19.1 that is further away from the clamping section 2.

[0045] FIGS. 4 and 5 show configurations of the magnet holder 8, 8.1. The magnet holder 8 shown in FIG. 4 by itself is also shown in the previous figures,. Depicted are the magnets 7a-7f used in the magnet holder 8. These are glued into the magnet holder 8. A single segment 21a-21f is provided for each magnet 7a-7f by predetermined buckling points 9a-9f pointing in the radial direction both in the direction of material thickness and transversely thereto. Tilting of the individual segments 21a-21f is made possible by the webs of lesser strength connecting the segments 21a-21f, so that the magnet holder 8 together with its magnets 7a-7f can adapt to the contour of the screw head.

[0046] An alternative embodiment of the magnet holder 8 is shown in FIG. 5 (identified with reference number 8.1). This has a smaller thickness and is stamped out of a sealing disc. This magnet holder 8.1 also has six magnets 7.1a-7.1f, inserted into individual segments 21.1a-21.1f, each separated by predetermined buckling points 9.1a-9.1f provided in the direction of the axis of rotation of the magnet holder 8 or bit holder 1. Deformation of the magnet holder 8 is equally possible in this embodiment.

[0047] While a number of exemplary aspects and embodiments have been discussed above, those of skill in the art will recognize certain modifications, permutations, additions and sub-combinations therefore. It is therefore intended that the following appended claims hereinafter introduced are interpreted to include all such modifications, permutations, additions and sub-combinations are within their true spirit and scope. Each apparatus embodiment described herein has numerous equivalents.

[0048] The terms and expressions which have been employed are used as terms of description and not of limitation, and there is no intention in the use of such terms and expressions of excluding any equivalents of the features shown and described or portions thereof, but it is recognized that various modifications are possible within the scope of the invention claimed. Thus, it should be understood that although the present invention has been specifically disclosed by preferred embodiments and optional features, modification and variation of the concepts herein disclosed may be resorted to by those skilled in the art, and that such modifications and variations are considered to be within the scope of this invention as defined by the appended claims.

[0049] In general the terms and phrases used herein have their art-recognized meaning, which can be found by reference to standard texts, journal references and contexts known to those skilled in the art. The above definitions are provided to clarify their specific use in the context of the invention.

LIST OF REFERENCE NUMERALS

[0050] 1 bit holder

[0051] 2 clamping region

[0052] 3 screw

[0053] 4 screw head

[0054] 5 rotary driver contour

[0055] 6 bit

[0056] 7a-7f, 7.1a-7.1f magnet

[0057] 8, 8.1 magnet holder

[0058] 9, 9a-9f, 9.1a-9.1f predetermined buckling point

[0059] 10 housing

[0060] 11 housing inner contour

[0061] 12 connector

[0062] 13 undercut

[0063] 14 connector internal thread

[0064] 15 bit receptacle external thread

[0065] 16 bit receptacle

[0066] 17 counter element

[0067] 18 counter element internal thread

[0068] 19, 19.1 smaller cross-sectional area section

[0069] 20 larger cross-sectional area section

[0070] 21a-21f, 21.1a-21.1f segment