EP1877229A1

EP1877229A1 - Bit screwdriver

Info

Publication number: EP1877229A1
Application number: EP06742255A
Authority: EP
Inventors: Hermann-Josef Wirtz
Original assignee: Schulte Johannes
Current assignee: Schulte Johannes
Priority date: 2005-05-03
Filing date: 2006-04-21
Publication date: 2008-01-16
Also published as: DE102005046186A1; WO2006116966A1

Abstract

The invention relates to a bit screwdriver (1) having a bit magazine (8) which is fastened to a shank (2) and into which a plurality of bits (7) can be inserted. The invention is characterized in that the bit magazine (8) has a cover (21) for fixing the bits (7) in the bit magazine (8). The cover (21) can be displaced in the axial direction of the shank (2) between an open position (O) and a closed position (S).

Description

Bit-Wrench

The invention relates to a bit-wrench having a mounted on a shaft bit magazine, in which a plurality of bits can be inserted.

Such a bit-wrenching tool is known from DE 103 46 422 A1. The bit magazine consists of a disc with a center hole. Bits are insertable into bores provided at a radial distance from the central bore in the disc. The bit magazine is clamped on a shaft of a screwdriver.

A disadvantage of this bit-wrench is that the bits are not secured sufficiently secure in the bit magazine so that they can fall out.

The invention has for its object to provide a bit-wrench with the features in the preamble of claim 1, whose bits are more reliable fixed in the bit magazine and which is also improved in practical handling.

This object is achieved by a bit-screwing tool with the features specified in claim 1. Core point of the invention is that the bit magazine has a cover for fixing the bits in the bit magazine and the cover in the axial direction of the shaft between an open position and a closed position is displaced.

The bits required for manual work are stored clearly and permanently in the bit magazine. In the closed position of the cover, the bit magazine is closed. Even when working overhead or in hard-to-reach places, the bits can not fall out of the bit magazine and get lost. In the open position of the cover, the bits can be easily removed from the bit magazine.

Another advantage of the invention is that in this bit-wrenching tool, the bits can not fall out of the bit magazine. In particular when using the bit-wrenching tool in conjunction with a screwdriving machine, high rotational speeds of the bit-wrenching tool can be achieved, so that the secure fixing represents a contribution to accident prevention.

In addition, the bits are located in close proximity to a bit holder and can thus be replaced in no time.

Advantageous embodiments and further developments of the inventive concept are subject matter of the dependent claims 2 to 13.

According to an advantageous embodiment, it is provided that the cover is designed as a hood. The hood can be pushed onto the bit magazine and covers the bits of the bits protruding from the bit magazine.

Advantageously, the hood has a locking mechanism. By the locking mechanism, the cover in the open position and in the closed position can be fixed. The locking mechanism engages in locking grooves on the shaft. It is provided a locking groove for the open position and a locking groove for the closed position. The locking mechanism Further comprises at least one, preferably two, acted upon by a spring locking pin. When using two locking pins they are aligned axially parallel to each other. Preferably, a ring is disposed between the spring and the locking pins to uniformly transmit the spring force to the locking pins. Thus, it is ensured that the bits can be removed from the bit magazine with one hand.

Preferably, the hood engages over the bit magazine on the periphery. As a result, the bits are dirt-protected in the bit magazine housed.

According to a further advantageous embodiment, the cover is formed as a tubular rubber jacket. Such a rubber jacket is particularly easy to produce and, if necessary, also cost-effectively replaceable.

The rubber jacket is designed so that in the closed position, a central portion contacts the bit magazine protruding ends of the bits. Thus, the rubber coat is slipped over the ends. This leads to a jamming fix the bits in the bit magazine.

Conveniently, a first end of the rubber sheath is peripherally attached to the bit magazine. A second end of the rubber sheath preferably has a bead. The bead engages in the open position of the cover in a circumferential groove in the peripheral side of the bit magazine.

Advantageously, the cover and / or the bit magazine is rotatably mounted on the shaft. If the cover or the bit magazine when screwing an object abut or lie against or rest on it - for example, by holding the bit magazine by the user - the cover and / or the bit magazine is decoupled from the rotational movement of the shaft and comes immediately to a standstill. Thus, no risk of damage or injury arises from the cover and / or the bit magazine. The invention is explained in more detail with reference to exemplary embodiments illustrated in the drawings. Show it:

Figure 1 shows a bit-screwing tool with hood in the closed position in longitudinal section;

Figure 2 is a section along the line M-II in Figure 1;

FIG. 3 shows a section along the line III-III in FIG. 1;

Figure 4 shows the bit-screwing tool of Figure 1 in the open position in longitudinal section;

FIG. 5 shows a detail of the bit screwing tool of FIG. 1;

FIG. 6 shows a detail of the bit-wrenching tool of FIG. 1 rotated by 90 ° about the longitudinal axis;

Figure 7 shows a bit screwing tool with rubber sheath in the open position in longitudinal section;

8 shows a cross section along the line VIII-VIII in Figure 7 and

Figure 9 shows a detail of the bit-screwing tool of Figure 7 in the closed position in longitudinal section.

In all figures, the same features are provided with identical reference numerals.

FIGS. 1, 4, 5 and 6 show a bit-wrenching tool 1 which has a shaft 2. The shank 2 has a contour 4 at its lower end 3 in the image plane, so that the shank 2 can be inserted in the chuck of a screwdriver and clamped there in a clamping manner. At its upper end 5, the shaft 2 has a bit holder 6 into which a bit 7 is inserted.

At a short distance from the lower end 3 of the shaft 2, a bit magazine 8 is rotatably mounted on the shaft 2. In the bit magazine 8 are up to seven bits 7 pluggable. The bit magazine 8 comprises a circular bottom 9, through the central bore 10 of the shaft 2 is inserted. The bottom 9 has on the circumferential side a wall 11, which extends in the direction of the bit holder 6 back. The bit magazine 8 is held at the bottom 9 by two retaining rings in the form of spring washers 12, 13 in position, which are inserted in grooves 14, 15 in the shaft 2. So that the inner spring ring 12 does not protrude from the bottom 9, it is arranged in a recess 16 in the bottom 9. The distance A between the peripheral side 17 of the shaft 2 and the inner side 18 of the wall 11 of the bit magazine 8 is just chosen so large that the bits 7 can be used with little play, with their side surfaces 19, the peripheral sides 17 of the shaft 2 and Contact the inside 18 of the wall 11.

On the bit holder 6 side facing 20 of the bit magazine 8, a cover 21 for fixing the bits 7 in the bit magazine 8 is provided. The cover 21 is displaceable between an open position O (FIG. 4) and a closed position S (FIG. 1). The cover 21 secures the bits 7 against falling out. The cover 21 is formed as a hood 22 which engages over the bit magazine 8 on the circumference. The hood 22 is placed on a guide sleeve 23, which in turn is guided on the shaft 2.

The hood 22 has a locking mechanism 24 with two locking pins 25, 26 for fixing the cover 21 in an open position O and in a closed position S. For this purpose, in the guide sleeve 23, two slots 27, 28 sawed at an angle of 45 °. The slots 27, 28 are provided in the image plane left and right in the guide sleeve 23. The width of the slots 27, 28 is dimensioned so that the locking pins 25, 26 are movable with play. The locking pins 25, 26 are inserted in parallel alignment with each other in the slots 27, 28 and are acted upon by a spring in the form of a coil spring 30 with a substantially constant force. In order to transmit the spring force evenly on the locking pins 25, 26, a ring 31 is provided, which is arranged between the coil spring 30 and the locking pins 25, 26. The coil spring 30 is also plugged onto the guide sleeve 23 and is supported against a stop 33 attached to the upper end 32 of the guide sleeve 23. The stop 33 simultaneously acts as a limit for the hood 22 which can be displaced in the axial direction of the shank 2 relative to the guide sleeve 23.

The locking pins 25, 26 engage in locking grooves 34, 35 on the shaft 2 a. There is a locking groove 34 for the open position O and a locking groove 35 for the closed position S provided. The side walls 36-39 of the locking grooves 34, 35 have an inclination of 45 ° and abut each other at an angle of 90 °.

In Figure 2, the cover 21 is shown in cross section. Inside, the shaft 2 can be seen, on which the guide sleeve 23 is placed. The two locking pins 25, 26 extend axially parallel to each other and are engaged in the locking groove 35 (see Figure 1) in the peripheral side 17 of the shaft 2. Outside, the hood 22 is arranged.

In Figure 3, the shaft 2 is also clearly visible on the inside. On the circumference seven bits 7 are arranged, wherein each side surface 19 of the bits 7 can contact the peripheral side 17 of the shaft 2 with a slight clearance. On the outside is the wall 11 of the bit magazine 8.

In Figure 7, and in part in Figure 9, a further embodiment of the bit screwing tool 40 is shown. Again, a round in cross-section shaft 41 is provided, which has a contour 43 at its lower end in image plane 42, which allows insertion and a clamping attachment in the lining of a Schraubbohrers. At the upper end 44 of the shaft 41, a bit holder 45 is provided, in which a bit 46 is inserted.

Halfway along the shaft 41, a bit magazine 47 is rotatably mounted on the shaft 41, wherein the shaft 41 is inserted through a central bore 48 of the bit magazine 47. For this purpose, on the upper side 49 and on the lower side 50 of the bit magazine 47 adjacent circlips in the form of spring washers 51, 52 are provided, which are inserted in circumferential grooves 53, 54 on the shaft 41. In the bit magazine 47 up to seven bits 46 can be used. At the bit holder 45 facing upper end 49 of the bit magazine 47, an annular groove 55 is provided at a radial distance B to the central bore 48 of the bit magazine 47. In this annular groove 55, the bits 46 can be used, so that each contact a side surface 56 of a bit 46, the inner wall 57 and up to two edges 58, the outer wall 59 of the annular groove 55 with play.

On the periphery of the bit magazine 47, a cover 60 is provided for fixing the bits 46 in the bit magazine 47 in the form of a tubular rubber jacket 61, which has its first end 62 on the peripheral side 63 immediately adjacent to the upper side 49 of the bit Magazine 46 is attached. The rubber jacket 61 is displaceable in the axial direction of the shaft 41 from an open position O (FIG. 7) into a closed position S (FIG. 9). In the closed position S, a middle section 64 of the rubber sheath 61 contacts the ends 65 of the bits protruding from the bit magazine 47. A second end 66 of the rubber jacket 61 is provided with a bead 67, which in the open position O in a circumferential groove 68 in the peripheral side 63 of the bit magazine 47 encloses. Consequently, the rubber jacket 61 can be pushed over the bits 46 for fixing the bits 46 in the bit magazine 47. The bits 46 are thus effectively protected against falling out.

In FIG. 9, it can also be clearly seen that in the closed position S the rubber jacket 61 contacts the middle section 64 with the bits 46 at their ends 65 protruding from the bit magazine 47. The bead 67 at the second end 66 of the rubber jacket 61 bears against the peripheral side 63 of the bit magazine 47.

In Figure 8, the shaft 41 is shown in the center, on which the bit magazine 47 is inserted. The inner wall 57 of the bit magazine 47 directly adjoins the shaft 41. Adjacent thereto are the outlines of seven bits 46 extending between the inner wall 57 and the outer wall 59. On the outside, two layers of the rubber jacket 61 are arranged. REFERENCE CHARACTERS:

1-bit screwdriver

2 - shaft

3 - lower end v.2

4 - Contour

5 - upper end v.2

6-bit bracket 7-bit

8-bit magazine

9 - floor

10- middle hole

11 - wall

12- spring washer

13- spring washer

14- groove

15 groove

16 - recess

17 - peripheral side v.2

18- inside v.11

19- side surface v.7

20 - page v.8

21 - cover 22- hood

23 - guide sleeve

24 - locking mechanism 25- locking pin

26 - locking pin

27 slot

28- slot

30 - coil spring

31 - ring

32 - upper end v.23 - stop - latching groove - locking groove - side wall - side wall - side wall - side wall - bit screwing tool - shaft - lower end v. 41 - contour - upper end v. 41 - Bit Mount - Bit - Bit Magazine - Center Hole - Upper Side v. 47 - lower side v. 47 - spring ring - spring ring - groove - groove - ring groove - side surface v. 46 - inner wall - edge - outer wall - cover - rubber jacket - 1st end of v. 61 - peripheral side v. 47 - middle section v. 61 5 - End v.46 6- 2. End v.61 7- Bead 8- Groove

A- distance B - distance

Claims

claims

1. Bit-wrench having a on a shaft (2, 41) fixed bit magazine (8, 47), in which a plurality of bits (7, 46) can be inserted, characterized in that the bit magazine (8, 47) has a cover (21, 60) for fixing the bits (7, 46) in the bit magazine (8, 47) and the cover (21, 60) in the axial direction of the shaft (2, 41) between an open position ( O) and a closed position (S) is displaceable.

2. bit screwing tool according to claim 1, characterized in that the cover (21) is designed as a hood (22).

3. bit screwing tool according to claim 2, characterized in that the hood (22) has a locking mechanism (24).

4. bit screwing tool according to claim 3, characterized in that the locking mechanism (24) in locking grooves (34, 35) on the shaft (2) engages.

5. bit screwing tool according to claim 2 or 3, characterized in that the locking mechanism (24) comprises at least one by a spring (30) acted upon locking pin (25, 26).

6. bit screwing tool according to one of claims 2 to 5, characterized in that the hood (22) engages over the bit magazine (8) on the circumference.

7. bit screwing tool according to claim 1, characterized in that the cover (60) is designed as a tubular rubber jacket (61).

8. bit screwing tool according to claim 7, characterized in that in the closed position (S) a middle portion (64) of the rubber sheath (61) from the bit magazine (47) protruding ends (65) of the bits (46) contacted ,

9. bit screwing tool according to claim 7 or 8, characterized in that a first end (62) of the rubber jacket (61) is peripherally attached to the bit magazine (47).

10. bit screwing tool according to one of claims 7 to 9, characterized in that a second end (66) of the rubber jacket (61) has a bead (67).

11. bit screwing tool according to claim 10, characterized in that in the open position (O), the bead (67) in a circumferential groove (68) in the peripheral side (63) of the bit magazine (47) surrounds.

12. bit screwing tool according to one of claims 1 to 6, characterized in that the cover (21) is rotatably mounted on the shaft (2).

13. bit screwing tool according to one of claims 1 to 12, characterized in that the bit magazine (8, 47) is rotatably mounted on the shaft (2, 41).