EP2627482A2

EP2627482A2 - Screwdriver

Info

Publication number: EP2627482A2
Application number: EP11833876.3A
Authority: EP
Inventors: Hans-Rainer Lindheim
Original assignee: Schuele Robert
Current assignee: Schuele Robert
Priority date: 2010-10-11
Filing date: 2011-10-11
Publication date: 2013-08-21
Also published as: WO2012051989A3; WO2012051989A2; DE102010047891A1

Abstract

A screwdriver, having at least one transmission means (5), which transmits pulling and pushing forces, consisting of a lower housing part (17) and an upper housing part (18), which transmit an input torque man (3) by interlocking engagement (2) in the driving unit (1) by means of a pulling strand (9) to a driven unit (20) and emits an output torque (22) by interlocking engagement (21) in the driven unit (20), characterized in that the transmission means (5) is guided between guiding surfaces (19) in such a way that pulling forces (7) are transmitted in the pulling strand (9) and pushing forces (8) are transmitted in the pushing strand (10).

Description

DESCRIPTION

Technical Field The present invention relates to a novel sturdy screwdriver comprising at least one transmission means which transmits tensile and shear forces.

State of the art

Devices for the transmission of torques, in particular for screwing and unscrewing screws and the like are well known from the prior art. Such screwdrivers are partially equipped with transmission means, the tensile and shear forces transmitted to the tool holders, for example. In the form of chains, toothed ropes, belts or belts.

In DE 103 30 175 AI and JP2000317853 angle wrench are described with a chain as a transmission member.

The disadvantage here is that the screwdriver described in DE 103 30 175 AI and JP2000317853 the drive torque only on the pulling strand (part or branch of the current Übertragungsmiffels) ask and therefore as a lever arm for the force in pulling Trum only the effective radius of the Drive wheel and / or the output gear act. As a result, the maximum transferable torque is very limited to the breaking load of the chain with the smallest effective radius of drive and / or output. This disadvantage can only be compensated conditionally by stronger chains, since the available materials and their maximum breaking strength as well as the space for the chain, which is limited by the surrounding parts of the screw, limits are set. The Due to its width, the chain itself reduces the effective radius by half the chain width - with the same housing width. Due to these circumstances, such a screwdriver has at the end of a not enough maximum transmittable torque per volume. Since one can also see the maximum transferable moment as the "performance characteristic of a product", this quotient is also referred to below as "power density". Usually the maximum transferable torque of the prototypes is only 20 Nm. These screwdrivers can therefore ultimately be destroyed by hand and are therefore not suitable for a hard industrial continuous use.

A gear train, for example, known from JP 4304970 B2 spur gears can not eliminate these disadvantages due to the lever arms and the small number of tooth engagements and due to the line loads in tooth engagement.

Further disadvantages of the already known solutions are:

A) Known screwdrivers contain no locking to lever open stuck screws can.

B) In the drive no crank is provided with the screws without a bulky cordless screwdriver can be solved quickly with long thread. C) Furthermore, screwdrivers known from the prior art have no cranks with an adjustable lever arm, so that even clamping areas with little force could be overcome.

D) There are no recordings for bits, adapters and / or tools provided with which one could save ways and times during installation. E) Furthermore, known screwdrivers have no interchangeable inserts for receiving bits, adapters and tools with which to prepare the screwdriver for the assembly of a special product and then quickly change. Such an insert would have a similar function to a consumable.

F) There are still no power take-offs available to solve as strong stuck but accessible screws without loading the chain can.

G) Known screwdrivers have only a positive connection in the drive and / or in the output, whereby the variability of the usable tools is limited. H) Moreover, according to the prior art screwdrivers have no holding magnets in the output, whereby the installation of screws in hard to reach places is greatly impaired or even impossible. Fallen screws must be searched and found. If they have fallen into cavities, this can significantly increase the cost of a repair,

I) Known screwdrivers have no padding in the grip area, so that a long-term use can be a "torment!" J) Due to their chain, these can also not be angled to place in certain mounting situations space for the use of electric screwdrivers and [0018] k) Ultimately, they can not be built as non-magnetizable screwdrivers. Presentation of the invention

The present invention is based on the object to provide a stable and suitable for industrial continuous use screwdriver with a transmission means which transmits train and shear forces, which has a higher "power density" and eliminates the disadvantages mentioned above.

According to the invention the above object is achieved with the features of claim 1. Advantageous embodiments of the inventive screwdriver are specified in subclaims.

Thereafter, a screwdriver of the type mentioned is characterized in that for transmitting the torque between a drive and an output, the transmission means in the pulling strand transmits a tensile force and in pushing strand a compressive force.

Below is understood by a transmission means a flexible means which transmits train and shear forces from a drive to an output. For this purpose, the transmission means is guided both on the traction side and on the thrust side between guide surfaces. These guide surfaces may be part of a lower housing part and / or upper housing part. But they can also be arranged in a separate part, such as a pressure-stable cable hose, as provided for tension and compression bowden cables.

By such a flexible but pressure-stable cable hose for guiding the transmission means, it is possible, the screwdriver on axes adjustable or rigid abzuwinkein. The transmission means has a toothing, via which the tensile and shear forces are transmitted by the drive in the transmission means and then in the output. As transmission means are primarily chains, toothed belts and ropes with toothed cable sheath. The essential and decisive advantage of the proposed stable screwdriver is thus that, in addition to the tensile force of the pulling run of a toothed transmission means through the guide surfaces, a sliding strand is created, which transmits additional thrust forces and, moreover, these forces are smaller are and act on a diameter, instead of only on a radius, whereby at least twice as high maximum torque can be transmitted and that by the advantageous use of cable hoses of the screwdriver on axes, adjustable and / or rigid can be angled.

Brief description of the drawings

Other objects, features, advantages and applications of the screwdriver will become apparent from the following description of an embodiment with reference to the drawings. All described and / or illustrated features, alone or in any combination form the subject matter of the invention, regardless of the summary in individual claims or their dependency.

In the drawings show

Figure 1 shows the components required for the transmission of the drive torque Man 3 in a schematic view.

A screwdriver with a chain 1 1 as a transmission means 5;

An isometric view of a screwdriver with removed upper housing part 18 and a cable 13 as a transmission means 5, wherein the cable sheath 15 has an annular toothing 6 which meshes with drive 1 and output 20 and the guide surfaces 19 in the housing parts 17th 18 are arranged; A bent screwdriver with a rope 13 as a transmission means 5, wherein the guide surfaces 19 are located in the two cable hoses 16; A section through an adjustable and lockable axle 25;

FIG. 6 shows a screwdriver with a band 12 as transmission means 5 in an isometric view; FIG.

A screwdriver with a belt 12 as a transmission means in a plan view and in two sections, wherein the drive 1 has a crank 31, in one of the two housing parts 17,18 receptacles 28 are introduced for tools 29 and in the another housing part is a pocket 26, in which a tool holder 27 are arranged with tools 29;

8 shows the band 12 in a greatly enlarged detail, wherein the band 1 2 consists of several very thin layers of steel sheet, which are interconnected.

Embodiment of the invention

Fig.l shows the components required for the transmission of the drive torque Man 3 in a schematic view. As can be seen from Fig.l, the drive torque Man 3 is introduced via the positive connection in the drive 2 in the drive 1. In the transmission means 5 are formed on the lever arm of the drive 4 tensile and shear forces 7, 8. In the transmission means 5, a toothing 6 is arranged which meshes with the drive 1 and the output 20. The tensile force 7 is formed in the pulling strand 9. The thrust force 8 is formed in the sliding strand 10, since the transmission means 5 is supported on the guide surfaces 19 and works like the rope of a pressure Bowden cable. At the output 20 is on the lever arm of the Downforce 23, the pair of forces 7, 8 converted into an output torque 22 and delivered via a positive connection in the output 21. As a transmission medium 5 are chains 1 1, tape winding 1 2 or ropes 13 into consideration, all of which require a toothing 6. The representation here is purely exemplary and does not limit the general idea of the invention.

In a further advantageous embodiment can - as Figure 2 shows - the transmission means 5 consist of a chain 1 1. The toothing 6 consists of the chain pins. The guide surfaces 19 are located in the housing lower part 17 and housing upper part 18. Drive 1 and output 20 are mounted in both housing parts 17, 18. In the output 20, a holding magnet 24 is arranged. The pad 30 is attached to the housing parts 17, 18 in the handle area. The drive torque Man 3 is introduced via one of the two form-fitting 2 in the drive. The tensile and compressive force 7, 8 is formed via the lever arm of the drive 4 in the pulling strand 9 and in the sliding strand 10. These forces 7, 8 are the smaller, the narrower the chain is 1 1 and the larger the lever arm in the drive 4 , At the output 20, the pair of forces 7, 8 is converted via the lever arm of the output 23 into an output torque Mab 22 and delivered via one of the two form-fitting in the output 21. The lever arms of input and output 4, 23 are smaller by one chain width than the available space 36th

The advantage of this design is that the space 36 is used here twice as well as in a pure traction drive. The lever arms 4, 23 are twice as large. However, the space 36 is not yet fully utilized except for one chain width in order to maximize the lever arms 4, 23. Another advantage is due to the fact that it is the chain 1 1 is a common and stable element of mechanical engineering, which can be changed inexpensively at a fraction and therefore can even be defined as a wearing part. Another advantage lies in the fact that the holding magnet 24 securely holds the screws during the assembly in the output 20. Another advantage lies in the fact that the drive 1 has two positive connections 2 and thus the variable Ability of the screwdriver is increased. Another advantage lies in the fact that the output 20 has two positive connections 2 and thus the variability of the screwdriver is increased. In a further advantageous embodiment can - as Figure 3 shows - the transmission means 5 consist of a rope 13. The toothing 6 is arranged annularly on the cable sheath 15. The guide surfaces 19 are arranged in the housing lower arrow 17 and housing upper part 18. Drive 1 and output 20 are mounted both in the two housing parts 17, 18. The lever arms of drive and output 4, 23 are smaller by the outer diameter of the cable sheath 15 than the available space 36th

The advantage of this embodiment is that the cable sheath 15 may be much finer toothed than a chain 1 1 and therefore the outer diameter of the cable sheath 15 may be substantially smaller than the chain width of a chain at the same maximum tensile force as the rope 13th As a result, more drive torque Man3 can be transmitted because the lever arms 4, 23 are larger. Another advantage is that the cable 13 is flexible in all directions and thus can not result in unequal load distribution in the cable cross-section, as may be the case with a chain 11 or a belt 12.

In a further advantageous embodiment can - as Figure 4 shows - the transmission center! 5 of the screwdriver consist of at least one cable 13. The toothing 6 is arranged annularly on the cable sheath 15. The guide surfaces 1 are arranged for the pulling strand 9 and the sliding strand 10 in a respective cable hose 16. The ends of the cable hoses 16 are arranged in the lower housing part 17. At least one end of a cable tube 16 may include a cable tensioner. The housing upper part 18 is arranged on the housing lower part 17. Drive 1 and output 20 are mounted in two housing parts 17, 18. In the output 20, a holding magnet 24 is arranged. The drive torque Man 3 is introduced via one of the two form-fitting 2 in the drive. The train and Compressive force 7, 8 is formed via the lever arm of the drive 4 in pulling strand 9 and in the sliding strand 10. These forces 7, 8 are smaller, the smaller the outer diameter of the cable sheath 15 and the larger the lever arms in the drive 4 and output 23 are. At the output 20, the pair of forces 7, 8 is converted via the lever arm of the output 23 into an output torque Mab 22 and delivered via one of the two form-fitting in the output 21. The lever arms of drive and output 4, 23 are smaller by the outer diameter of the cable sheath 15 than the available space 36th

The advantage of this embodiment is that the housing parts 17, 18 can now be rigidly and / or adjustably angled about any number of axes 25. This significantly increases variability and accessibility.

In a further advantageous embodiment can - as Figure 5 shows - the axis 25 also be adjustable and lockable. The lower housing part 17 and the upper housing part 18 are each in two parts. The two lower housing parts are rotatably connected to each other via the bearing pin 41 and the key 38. The locking pin 39 engages from a lower housing part 17 in the second housing lower part 17 and locks the mobility. For this purpose, a spring 40 is arranged in a housing lower part 17, which presses on the locking pin 39. The button 38 has a paragraph with which they can move the locking pin 39 until the axis 25 can be adjusted and locked again.

The advantage of this design is that the screwdriver can be set even more variable on the mounting situation. In a further advantageous embodiment can - as Figure 6 shows - the transmission means 5 of the screwdriver consist of a band 12. The strip 12 has at least one toothing 6. The guide surfaces 19 are again in the direction of the pulling strand 9 and the sliding strand 10. housing lower part 17 and arranged in the upper housing part 18. The upper housing part 18 is arranged on the lower housing part 17. Drive 1 and output 20 are mounted in two housing parts 17, 18. In the output 20, a holding magnet 24 is arranged. The drive torque Man 3 is introduced via one of the two form-fitting 2 in the drive. The tensile and compressive force 7, 8 is formed via the lever arm of the drive 4 in the pulling strand 9 and in the sliding strand 10. These forces 7, 8 are smaller, the smaller the thickness of the band 12 and the larger the lever arms in the drive 4 and output 23 are. At the output 20, the pair of forces 7, 8 is converted via the lever arm of the output 23 into an output torque Mab 22 and delivered via one of the two form-fitting in the output 21. The lever arms of input and output 4, 23 are smaller than the available installation space 36 only by the thickness of the strip 12. The advantage of this design is that the highest power density can be produced with this design. The transmission means 5 uses the entire height of the screwdriver and has due to the small thickness of the belt 12 a maximum large lever arm. Another advantage lies in the fact that the band is very simple and inexpensive compared to a chain and can consist of several layers of very thin steel sheet but also of carbon fiber-containing material. This can then also antimagnetic screwdrivers are made. In a further advantageous embodiment, as shown in FIG. 7, a holding magnet 24 may be arranged in the output drive 20, provided that the screwdriver does not have to be non-magnetic. At each drive a crank 31 can be arranged, which can be folded and can assume four preferred positions 32, 33, 34, 35. In locking position 32, the nutrunner is locked in order to lift fixed screws. For this purpose, the lever is firmly fixed to at least one of the two housing parts 17, 18. In the intermediate position 33, a slightly clamping screw with a larger lever arm can be easily rotated. In the chuck position 34 The lever can be folded so that it is aligned with the axis of the drive 1 and the drive 1 can be clamped in the chuck of a drill. In manual crank position 35, long smooth-running screws can be turned very quickly by hand. In the lower housing part 1 7 and / or in the upper housing part 18 different receptacles 28 are mounted for receiving tools 29. In the lower housing part 1 7 and / or in the upper housing part 18, a pocket 26 may be located in which a removable tool holder 27 with, according to the mounting situation necessary tools 29 sits.

The advantage of this design is that for driving the tool 29 no additional cordless screwdriver is more necessary, but the screws can also be driven by hand. Another advantage lies in the fact that the screws are held in the screwdriver by the holding magnet 24 and can no longer fall into cavities, which can lead to significant additional costs in a repair. Another advantage is due to the fact that in the locking position 32 of the screwdriver can be locked to aufhebein fixed screws. Another advantage lies in the fact that in the intermediate position 33, a somewhat clamping screw with a larger lever arm can be turned more easily. Another advantage lies in the fact that in the chuck position 34, the lever can be folded so that it is aligned with the axis of the drive 1 and the drive 1 can be clamped in the chuck of a drill. Another advantage lies in the fact that in the hand crank position 35 long smooth-running screws can be turned very quickly by hand. Another advantage is due to the fact that in the lower housing part 1 7 and / or in the upper housing part 1 8 is a pocket 26, in which a removable tool holder 27 with, according to the mounting situation necessary tools 29 sits. In a further advantageous embodiment can - as Figure 8 shows - the band 12 consist of a multi-layer winding of very thin steel sheet. The teeth 6 was punched after winding and gluing the individual layers of the strip 12 in one operation.

The advantage of this design is that very thin steel sheet has very high strengths and is still very flexible. Another advantage lies in the fact that steel strip and also the winding and punching of the toothing 6 is very inexpensive and precise.

The screwdriver according to the invention is not limited in its execution to the above-mentioned preferred embodiments. Rather, a variety of design variations are possible, which make use of the solution shown even with fundamentally different type of execution.

List of reference numbers

1 drive

2 positive locking in the drive

3 drive torque man

4 lever arm drive

5 transmission means

6 teeth

7 traction

8 thrust

9 Pulling Trum

10 sliding strand

1 1 chain

12 band

13 rope

14 rope core

15 cable sheath cable hose

Housing base Housing top Guide surfaces Output

Positive locking in the output Output torque Mab Lever arm Output Holding magnet Adjustable axle pocket

Tool holder holder

Tool

pad

crank

Position Locking Intermediate position Position Chuck Position Hand crank Space

tensioner

button

safety catch

feather

bearing bolt

Claims

1. screwdriver, comprising at least one transmission means (5) which transmits tension and thrust forces, consisting of a housing with a lower part (17) and a housing upper part (18) softer a drive torque Man (3) via a positive connection (2) in the drive ( 1) transmits by means of a pulling run (9) to an output (20) and outputs an output torque (22) via a positive connection (21) in the output (20),

characterized,

that the transfer means (5) between guide surfaces (19) is guided so that in the pulling run (9) tensile forces (7) and in the sliding strand (10) shear forces (8) are transmitted.

2. Screwdriver according to claim 1,

characterized,

in that the transmission means (5) consists of a chain (1 1) with a toothing (6) and in that the guide surfaces (19) are arranged in the lower housing part (17) and / or in the upper housing part (18).

3. Screwdriver according to claim 1,

characterized,

in that the transmission means (5) consists of a band (12) on which at least one toothing (6) is arranged and in that the guide surfaces (19) are arranged in the lower housing part (17) and / or in the upper housing part (18).

4. Screwdriver according to claim 1,

characterized,

in that the transmission means (5) consists of a cable (13) with a cable core (14) and a cable jacket (15) with externally arranged toothing (6) with annular teeth, and in that the guide surfaces (19) in the housing lower part (1 7) and / or in the housing seoberteil (18) and or in a cable hose (16) are arranged.

5. Screwdriver according to claim 1 and 4,

characterized,

in that the cable tube (16) is guided around at least one rigid axle (25) in order to angle the driver on the rigid axle (25).

6. Screwdriver according to claims 1, 4 and 5,

characterized,

in that the two cable hoses (16) are guided around at least one adjustable axle (25) in order to adjust the wrench adjustably on the axle (25) and, by means of a button (38) arranged in the housing lower part (17), a locking bolt (39) is arranged so that both housing bases (17) locked together and with the bearing pin (41) are also mounted on both sides, against a spring (40) moves and thus the adjustment of the axis (25) is released.

7. screwdriver according to claims 1, 4, 5 and 6,

characterized,

in that at least one of the ends of the cable hoses (16) is a cable tensioner (37).

8. Screwdriver according to one of the preceding claims,

characterized by

the output (20) has two form-fit connections.

9. Screwdriver according to one of the preceding claims,

characterized,

in that a holding magnet (24) is arranged in the output (20).

10. screwdriver, according to one of the preceding claims,

characterized,

in that receptacles (28) are arranged in the tool lower part (17) and / or in the upper part of the tool (18), in which tools (29) can be arranged.

11. Screwdriver according to one of the preceding claims,

characterized,

that in the lower tool part (17) and / or in the upper tool part (18) is a pocket (26) in which there is at least one tool holder (27) in which tools (29) are arranged for a specific assembly situation.

12. Screwdriver according to one of the preceding claims,

characterized,

a pad (30) is arranged on the tool lower part (17) and / or on the upper part of the tool (18).

13. Screwdriver according to one of the preceding claims,

characterized,

that in the drive (1) a crank (31) is arranged, which in a locking position (32) is foldable, in which the crank (31) the drive (1) fixed to one of the two housing parts (17) and / or (18) connects.

14. Screwdriver according to one of the preceding claims,

characterized,

that in the drive (1) a crank (31) is arranged, which in an intermediate position (33) is foldable, in which the crank (31) forms a long lever arm to easily drive clamping screws by hand can.

15. Screwdriver according to one of the preceding claims, characterized

that in the drive (1) a crank (31) is arranged, which in a chuck position (33) is foldable, in which the crank (31) can be clamped in the chuck of a machine.

16. Screwdriver according to one of the preceding claims, characterized

that in the drive (1) a crank (31) is arranged, which in a hand crank position (33) is foldable, in which the crank (31) for rapid driving of the screw is used by hand.