CN208231659U

CN208231659U - Screwdriver

Info

Publication number: CN208231659U
Application number: CN201820607533.XU
Authority: CN
Inventors: H·克瑙斯特; S·黑林格; A·贝
Original assignee: Wiha Werkzeuge GmbH
Current assignee: Wiha Werkzeuge GmbH
Priority date: 2017-04-27
Filing date: 2018-04-26
Publication date: 2018-12-14
Anticipated expiration: 2028-04-26
Also published as: DE202017102507U1

Abstract

The utility model relates to a screwdriver, the purpose can prevent to transmit on the screw at manual operation too big torque. The screwdriver comprises a shank (2) having a longitudinal axis, said shank having a tool unit (3) on one end thereof extending in the direction of the longitudinal axis; and a drive device (4) having a motor (10) and a load torque lock (7) via which the motor (10) can be coupled to the tool unit (3), characterized in that the screwdriver (1) has a torque limiting device between the load torque lock (7) and the tool unit (3), the limit value of which is greater than the maximum output torque of the drive device (4). The screw driver has the beneficial effects that the design scheme of the screw driver can prevent overlarge torque from being transmitted to the screw in manual operation.

Description

Screwdriver

Technical field

The utility model relates to a kind of screwdriver, the screwdriver includes: the shank with longitudinal axis, and the shank is at it The tool unit that there is direction longitudinally to extend on one end；And driving equipment, the driving equipment have motor and Loading moment lock can couple motor with tool unit via loading moment lock.

Background technique

Start to refer to that the screwdriver of type is known.However, the screwdriver for example has the disadvantages that driving equipment The output torque being applied on screw cannot precisely enough set, in other words exist excessive torque is led to due to faulty operation Cross the risk that tool unit is transmitted on screw.This can for example cause that the screw terminal of be screwed into screw falls off or screw is screwed into Workpiece damage.

In addition, with electric terminal object or equipment on work when, always do not allow using this screwdriver.Especially It is forbidden to use and starts to refer to that the conventional screwdriver (i.e. such as normal charge formula screwdriver) of type works on electric lead, because In this case there is the risk that electric lead is pierced through or broken by screw, reason is when by the screw tightening, excessive Output torque is transmitted on the screw by the driving device of screwdriver.

In addition, start the conventional screwdriver of type is referred to have the disadvantages that thus and cannot or can only be screwed into very difficultly The fixed screw of lesser screw that is, the blade for the screw of longer screw thread, for example in milling cutter.Fixed screw usually has There is relatively small ratio.This is attributed to the small thickness for the blade that screw should be screwed into, without piercing through the blade.

On the other hand, very troublesome, screw is only screwed into matched spiral shell by hand in the case where no motor auxiliary In line, since this often means that power and time that consumption is big.In addition, being not excluded for when with hand to be screwed into manually excessive Torque transfer to screw on.

Another problem when working on electric member may is that the user of conventional screwdriver is subjected to voltage breakdown Risk, and this may cause user's major injuries.

Utility model content

Therefore, the purpose that the utility model is based on is to overcome the disadvantages mentioned above of known screwdriver.Especially, this is practical Novel technical purpose can be prevented in excessive torque transfer to screw in manually being operated with hand.

Therefore, a kind of screw is proposed especially for mentioned purpose is realized in the screwdriver for being illustrated starting at type Knife comprising the shank with longitudinal axis, the tool that there is the shank direction longitudinally to extend in one end thereof Unit；And there is motor and loading moment to lock for driving equipment, the driving equipment, it can will be described via loading moment lock Motor is coupled with the tool unit, wherein the especially coupling part and the work that the screwdriver is locked in the loading moment Having has torque restricting means between unit, the limits value of the torque restricting means is designed as the maximum output greater than driving equipment Torque.It may be implemented by screwdriver structure according to the present utility model: first by thread part by the power of driving equipment Such as be screwed into the screw thread or material being arranged thus that is, until first tighten position, subsequently, by means of hand operation, pass through Via screwdriver shank transmitting manual force by the screw be fully threaded into or material in that is, to second tighten position In.The utility model has the beneficial effects that can prevent by screwdriver design scheme according to the present utility model manually With hand operate in excessive torque transfer to screw.Especially can be in line with the purpose, shank is formed of an electrically insulating material, with Just leakage current is prevented.

Replacing for the purpose can be realized using the feature described before individually or in a joint manner according to one Solution is selected to propose, the driving equipment of screwdriver according to the present utility model has 0.7 Newton meter or less than 0.7 Newton meter Maximum output torque.Here, especially can be in line with the purpose, driving equipment has less than 0.6 Newton meter, is preferably smaller than 0.5 The maximum output torque of Newton meter.This can for example be realized by correspondingly design driven equipment.To this alternative or addedly It is possible that can be realized as follows to the limitation of maximum output torque: being correspondingly designed as the energy source that driving equipment is supplied. It can be prevented in principle by this design scheme of the driving equipment of screwdriver according to the present utility model: can be by means of spiral shell Screw is fully screwed by the driving equipment of silk knife, because the maximum output torque of driving equipment set up is not big enough to this 's.In this way, screwdriver according to the present utility model is also applied for using in electrical applications, because by means of the driving Equipment can not excessively tighten screw securely.

Replacing for the purpose can be realized using the feature described before individually or in a joint manner according to one Select solution to propose, screwdriver has an insulating cover, the insulating cover by screwdriver screwdriver the tool unit that is provided with The electrically conductive component of end is externally electrically insulated.Especially, insulating cover can be arranged for tool unit and/or output shaft electricity Insulation.It herein can be advantageously, tool unit can be coupled with output shaft or be constituted one-piece with output shaft.Therefore It can prevent the user of screwdriver from accidentally contacting with the electrically conductive component of screwdriver.It can will be electric via processed workpiece Pressure is applied on electrically conductive component.Since undesirable leakage current can cause injury due to user contacts electrically conductive component, Therefore it can be better protected from by means of insulating cover.

In order to diversely use above-mentioned screwdriver as far as possible, purpose can be met, tool unit is configured to Driver head rack.Thus, it is possible to use different screw types by means of screwdriver.This can equally be proposed as an alternative, tool unit It is configured to screw blade.Herein more particularly to advantageously, internal diameter of the driver head rack with 6.3 millimeters or less than 6.3 millimeters.Have Can have an advantage that less than 6.3 millimeters as the driver head rack of net internal diameter or net inner width cannot use conventional non-electrical The screwdriver bit of insulation.

In order to prevent screwdriver bit from falling off from the tool unit for be configured to driver head rack, the tool unit has for solid The fixing element for the screwdriver bit that is fitted into or can be fitted into tool unit calmly.Herein can advantageously, fixing element by electrical isolation material Material is constituted.Especially consider the non-conducting material of plastics or rubber as electrical isolation.Purpose, fixed mechanism can especially be met It is configured to O shape ring.The O-ring can for example be arranged in the introducing opening of driver head rack or be arranged inside driver head rack.It is non- The fixing element of conductive electrical isolation has an advantage that the metal component that therefore can be realized screwdriver is externally completely insulated. Especially when using the completely insulated screwdriver bit for being fitted into driver head rack, no leakage current can be via the outside of screwdriver The component of direction flows out, and the leakage current may cause user injured.By relatively soft insulating materials, for example rubber or Fixing element made of plastics another advantage is that by fixing element can be than in usually used metal mounting element In the case of preferably avoid damage from being introduced into driver head rack completely insulated, the usually used metal mounting element of screwdriver bit For example, clamping ring, ball is buckled or the like.Especially it can thus reduce the exhausted of screwdriver bit when frequently replacing the screwdriver bit in driver head rack The abrasion of edge layer.

Therefore, it can also be proposed according to another expedients scheme of screwdriver, screwdriver, which has, can be inserted into tool unit In completely insulated screwdriver bit or multiple pluggable completely insulated one group screwdriver bits.It is one herein more particularly to propose Or the feeding area for being packed into driver head rack in the position of use of multiple screwdriver bits has 6.3 millimeters or the outer diameter less than 6.3 millimeters.Often The screwdriver bit of the screwdriver of rule is usually made of conductive metal material, this causes leakage current that can flow through the screwdriver bit.This can It is prevented by itself insulation of screwdriver bit.

Another expedients scheme according to the present utility model can propose that the motor structure of driving equipment is electronic horse It reaches.Torque capacity can be set by the motor of correspondingly tectonic forcing equipment, thus, it is possible to prevent excessive torque transfer from arriving On screw.

According to the utility model can it is further proposed that, the maximum output torque ratio of driving equipment passes through the manual real estate of shank Raw torque is smaller.This more particularly to realizing as follows: the shank has the specific ergonomic department of the Chinese Academy of Sciences.

It is as with long service life as possible in order to which the driving equipment of screwdriver to be configured to, it can be advantageously, driving Equipment has monitoring unit, and when the motor reaches blocking site, the monitoring unit turns off the motor.Under this is then It states situation: being no longer sufficient to for screw being further torqued into screw thread by the output torque that motor generates.In this case, motor It is blocked, and monitoring unit recognizes the blocking site.This can prevent motor to be damaged because of overstress.Herein can Enough especially to meet purpose, monitoring unit is established as so that its be delayed after reaching blocking site, especially after 2 seconds Turn off motor.This has an advantage that the manually handle of screwdriver according to the present utility model can be via in pawl form Shank is realized.Therefore, when user carries out the return movement for being screwed into direction for being in reverse to screwdriver, the motor that not yet turns off Resistance works.This cause tool unit to be able to maintain in the position remained unchanged and need not rerun so as to Screw can be fully screwed into.Detent function works in narrow space more particularly to realize.

Purpose can especially be met, set up the torque restricting means with extra high precision.This can be prevented It is screwed into torque transfer to screw excessive when screw manually.Purpose, torque restricting means tool can especially be met herein There is the precision of +/- 10%, especially +/- 6%.

The service life of screwdriver is especially long and stable structure type can propose, loading moment Lock structure is pinch roll Loading moment lock.

In order to make to become easy in poor indoor worked by means of screwdriver of illumination, purpose, screw can be met Cutter has lighting device.Purpose can especially be met herein, lighting device and/or motor can be connect by operating element Logical and shutdown.Here, operating element can for example be configured to swivel becket.It is configured to swivel becket and has an advantage that executable pair The particularly good fine tuning of output torque.In addition, thus, it is possible to prevent from constituting weak part at shank.

It, can be advantageously, motor can connect with being delayed after lighting device in order to improve the operation power of screwdriver It is logical.This allows user to have been placed in screwdriver on screw in the poor interior of illumination, has activated without motor.

Purpose can be further conformed to, screwdriver has energy storage device, and the energy storage device is arranged in shank It is internal.The structural form as compact as possible of screwdriver can propose that driving equipment is similarly disposed inside shank.Preferably, Screwdriver has replaceable energy storage device.Especially, energy storage device is battery.This has an advantage that by spiral shell Silk knife can be realized the longer working time, because can carry out empty energy storage device more with charged energy storage device It changes.

In order to realize back-outing for bolt by means of screwdriver other than being screwed into, can propose, tool unit energy Enough driven equipments drive clockwise and anticlockwise around longitudinal axis.It is furthermore possible to meet purpose, driving equipment, which has, to be passed Dynamic device, so as to set output torque.

One of screwdriver is because long service life and structural scheme that is firm and especially meeting purpose can propose, torque Limits device is configured to the safety clutch device of torque switching.Purpose, torque restricting means structure can especially be met herein It makes as slip clutch device or is configured to lock body arrangement of clutch.

It is mentioned in order to be realized by the method for starting to refer to type about another solution of mentioned purpose Purpose and propose, in the first step, by the driving equipment of screwdriver with 0.7 Newton meter or less than 0.7 Newton meter, especially small Screw is tightened in position until being screwed into first in the maximum output torque of 0.6 Newton meter, preferably smaller than 0.5 Newton meter, Described first tighten screw in position be not yet fully screwed into and the motor of driving equipment reach blocking site；In second step In, screw is screwed into second with hand and is tightened in position, screw in position is tightened described second and is fully screwed into, wherein by position Torque restricting means between the especially coupling part and tool unit that the loading moment of driving equipment is locked are excessive to prevent On torque to screw.Wherein in this case, excessive torque means that: screw and/or workpiece is damaged or screw Excessively it is screwed into securely and/or too far.Therefore, can equally screw be prevented to be screwed by means of method according to the present utility model In material, the damage at screw or processed workpiece, such as the damage on electric lead are thus generated.

Purpose, method according to the present utility model and screwdriver according to the present utility model can especially be met herein It executes as described herein and as claimed.

It is screwed into screw as simply as possible in order to realize, and user need not be after reaching blocking site by screwdriver It reapposes on screw terminal, but screwdriver can be placed on screw terminal, purpose can be met, block reaching Just delay ground turns off motor after position.Can especially meet purpose herein, motor when reaching blocking site after 2 seconds It is turned off.This can be realized uses screwdriver in pawl mode.

The utility model relates to a kind of screwdriver, the screwdriver have along screwdriver longitudinal axis extend shank and Driving equipment, the shank have the tool unit equally longitudinally extended, the driving equipment tool in one end thereof There are motor and loading moment lock, the motor can be locked via the loading moment to be coupled with tool unit, wherein screwdriver exists There are torque restricting means between the coupling part and tool unit of loading moment lock, the torque restricting means are established as, make Obtain the maximum output torque that limits value is greater than driving equipment.

Detailed description of the invention

Now, the utility model is described by embodiment, but is not limited to the embodiment.Other embodiments pass through reality The combination for applying the single or multiple features of example obtains.

In the accompanying drawings:

Fig. 1 shows the implementation shape of the screwdriver according to the present utility model with torque restricting means being shown ... in a side view Formula；

Fig. 2 shows the forms of implementation of screwdriver according to the present utility model being shown ... in a side view, and wherein driving equipment has There are 0.7 Newton meter or the maximum output torque less than 0.7 Newton meter；

Fig. 3 shows the form of implementation of screwdriver according to the present utility model being shown ... in a side view, and wherein screwdriver is remote Side region is shown in section view；

Fig. 4 shows the view that the longitudinal direction of screwdriver according to the present utility model is splitted；

Fig. 5 shows the form of implementation of screwdriver according to the present utility model being shown ... in a side view, and wherein screwdriver is set The region for being equipped with transmission device is shown in section view；

Fig. 6 shows the cross section of the loading moment lock of screwdriver according to the present utility model,

Specific embodiment

Fig. 1 shows the screwdriver that entirety according to the present utility model is indicated with 1, the chasing tool pelmatozoa 2, the handle Portion extends along the longitudinal axis of screwdriver 1.Shank 2 has equally in one end thereof along the longitudinal axis extension of screwdriver 1 Tool unit 3.The motor drive of tool unit 3 is realized by means of driving equipment 4.Driving equipment 4 has motor 10 thus With loading moment lock 7, motor 10 can be coupled with tool unit 3 via loading moment lock.Shank 2 is by non-conducting material It is made.Therefore it can prevent undesirable leakage current from flowing through shank.

Such as illustrated in Fig. 6 loading moment lock 7 can also be characterized as two-sided action freewheel clutch and It is known in the prior art.One known structural scheme is, for example, the negative of auspicious class (Ringspann) limited liability company It carries torque and locks IR.The working method of loading moment lock 7 is briefly described by Fig. 6 below.Loading moment lock 7 has certain amount , preferably three rolling elements 13, especially pinch roll, the rolling element and a certain number of, preferably three clamping bodies 11 are made jointly With.Rolling element 13 and clamping body 11 are arranged in inside the annular circulating ring 12 of loading moment lock 7.By clamping body 11, can borrow Help motor 10 to transmit torque on output shaft 14.If output shaft 14 is driven by motor 10, rolling element 13 is clamped Body 11 is in rotational direction in annular 12 inner clamps band of circulating ring, and wherein clamping body 11 transmits torque on output shaft 14, so that The output shaft rotation.When manual torque to be transmitted on screw via shank 2, rolling element 13 is clamped to follow positioned at annular In tapered gap 15 between the inner face and output shaft 14 of ring 12.Therefore, when shank 2 rotates, motor 10 is rotated with it.

Excessive torque is transmitted on screw by driving equipment 4 in order to prevent, screwdriver 1 according to the present utility model There are torque restricting means between loading moment lock 7 and tool unit 3.Especially, torque restricting means are built up in load force Between the coupling part and tool unit 3 of square lock 7.Coupling part passes through clamping body 11 and the formation of output shaft 14.Here, torque limits Device processed is established as, so that its limits value is greater than the maximum output torque of driving equipment.Torque restricting means are for that can prevent It can will be in excessive torque transfer to screw by means of can be manually rotated.Especially, the torque restricting means can be built up in defeated Between shaft 14 and tool unit 3, wherein the safety clutch device 6 that torque restricting means are switched by torque is set up, by means of The safety clutch device can couple tool unit 3 and output shaft 4.

There is 0.7 Newton meter according to the driving equipment 4 of the screwdriver 1 of Fig. 1-6 or less than the maximum output power of 0.7 Newton meter Square.This can for example be realized by construction motor and/or by using suitable energy source 9.Can particularly advantageously, With the maximum output torque less than 0.6 Newton meter, especially less than 0.5 Newton meter.By with the conventional spiral shell that starts to refer to type Silk knife compares the driving equipment 4 constituted weakly, is incorporated in the torque limit set up between loading moment lock 7 and tool unit 3 Device may be implemented for the first time, by means of starting to refer to that the screwdriver 1 of type can be prevented excessive torque to screw On.This realization following first: screw is screwed into first by means of driving equipment 4 and is tightened in position, tightens position described first Middle screw is not yet fully screwed into.The motor of driving equipment 4 is tightened first and reaches blocking site in position because resistance it is excessive with Cause cannot be overcome by the output torque generated by motor 10.Then, screw second is screwed by the transmitting of manually power with hand to twist In tight position, screw in position is tightened described second and is fully screwed into.Here, locking 7 by means of the loading moment in driving equipment 4 The torque restricting means set up between tool unit 3 prevent will be on excessive torque to screw.

The form of implementation of the screwdriver 1 without torque restricting means, the torque limit are shown respectively in Fig. 2 to 5 Device has insulating cover 17, and the electrically conductive component of screwdriver 1 is provided with tool unit 3 in screwdriver 1 by the insulating cover It is externally electrically insulated in distal end.It is located at however, can also be set up in the form of implementation shown in Fig. 2 to 5 of screwdriver 1 Torque restricting means between loading moment lock 7 and tool unit 3.In this case, output shaft 14 and tool unit 3 can It is coupled via the safety clutch device 6 of torque switching.As shown in Fig. 3 and 4, insulating cover 17 is at least arranged for tooling order The electrical isolation of member 3 and output shaft 14.Tool unit 3 is constituted with output shaft 14 one-piece in this embodiment.Insulating cover 17 It prevents from accidentally contacting between the user of screwdriver 1 and the electrically conductive component of screwdriver 1.Example can be better protected from The body of user via electrically conductive component is such as flowed through due to undesirable leakage current and injured.Therefore, without leakage current The external face of screwdriver 1 can be flowed through, because insulating cover 17 and shank 2 are made of electrically insulating material and then are formed insulation shell Body.

In order to which diversely using the screwdriver according to the present utility model 1 with different screw blades, mesh can be met , tool unit 3 is configured to accommodate the driver head rack of different screwdriver bits.This is allowed to using with different screw terminals Screw.

The tool unit 3 for being configured to driver head rack has fixing element 16, and the fixing element is configured to O-ring.Fixed member Part 16 is arranged on the edge of receiving opening of driver head rack.Fixing element 16 is by elastomeric materials, when screwdriver bit is introduced screwdriver bit When frame, the elastic material exists in compressed fashion.Thus screwdriver bit is axially fixed and is fallen to prevent anti-avulsion.Suitable material example It such as can be rubber or other elastomers or plastics.Fixing element 16 is particularly suited for that screwdriver bit is combined to use, and the screwdriver bit has non- Conductive external insulation layer.Due to the material relatively soft compared with the fixing element of routine, usual metal of fixing element 16, subtract The abrasion of the insulation coating to screwdriver bit is lacked.It is furthermore possible to preferably avoid the damage of the insulating layer of screwdriver bit, such as by solid Determine to damage caused by scraping on element 16.

Therefore, screwdriver 1 also can include the special screwdriver bit with electric insulation layer, and the screwdriver bit is designed for that can be packed into In the driver head rack set up thus.Conventional screwdriver bit is usually metallic conduction, this causes undesirable leakage current that can flow through The screwdriver bit.This can be prevented by the insulation of itself of screwdriver bit.

By the special tectonic of shank 2, the maximum output torque of driving equipment 4 turns than can pass through that shank 2 provides manually Square is smaller.This can for example be realized by the special ergonomic department of the Chinese Academy of Sciences of shank 2.

The motor 10 of driving equipment 4 is configured to electric motor.Furthermore especially meet purpose, driving equipment 4 has prison Unit is controlled, when the motor reaches blocking site, the monitoring unit turns off motor 10, and the blocking site is present in screw First tighten in position.This prevents motor 10 to be damaged, because the motor resists excessive resistance in a longer period of time Power and work.Purpose can especially be met herein, monitoring unit turns off motor 10 with being delayed, so that screwdriver 1 can be used As a kind of pawl.This has an advantage that screwdriver 1 according to the present utility model need not be placed in via tool unit 3 again On screw terminal, but the resistance that motor 10 resists screw works, and user is in reverse to via the realization of shank 2 and is screwed into direction Rotation.Then, screw can be screwed into the case where not grasping.

Torque restricting means have +/- 10% extra high precision so that thus, it is possible to ensure screw can position it is accurate Ground is screwed into defined second and tightens in position.

The loading moment lock 7 of driving equipment 4 is configured to step up roller loading moment lock.This construction of loading moment lock 7 is true High stability and long service life are protected.

In order to make to become easy in poor, the dark office work of illumination, screwdriver 1 according to the present utility model has Lighting device.Here, lighting device can be switched on and off together individually or with motor 10.Can especially it meet herein Purpose, lighting device and motor 10 can be turned on and off via common operating element 5.Operating element 5 is in Fig. 1 It is configured to swivel becket.This is favourable, because of its relatively uniform construction that can be realized operating element 5 and shank 2 and in turn It prevents from constituting weak part in shank 2, the weak part may for example be deposited in the structural scheme as button or switch ?.Screwdriver 1 can be established as in the case where turning on and off motor 10 and lighting device jointly via operating element 5, be made Obtaining motor 10 can connect with being delayed after lighting device.This has an advantage that tool unit 3 can be placed in spiral shell first On silk head, the screw terminal can more simply be positioned by means of the sufficient light of lighting device.It is set by tool unit 3 After on screw, motor 10 is activated and is screwed screw until first tightens in position with being delayed after lighting device.

In order to realize the structural scheme as compact as possible of screwdriver 1, driving equipment 4 and the energy for driving equipment 4 Reservoir 9 is arranged inside shank 2.Preferably, energy storage device 9 is replaceable energy storage device 9, so that by means of root It can for longer periods work according to the screwdriver 1 of the utility model.This can be realized as follows: can be by empty energy storage device 9 It is substituted with fully charged energy storage device.

The tool unit 3 of screwdriver can driven equipment 4 driven clockwise and anticlockwise around the longitudinal axis of screwdriver 1 It is dynamic.This allows to for screw being screwed in and out.

Driving equipment 4 has transmission device 8, can set different output by the transmission device for driving equipment 4 Torque.This allows to determine that different first of screw tighten position when being screwed into the screw by means of driving equipment 4.

Torque restricting means are configured to the safety clutch device 6 of torque switching, are especially configured to slip clutch device or lock Determine body arrangement of clutch.Therefore, torque restricting means prevent transmitting of the excessive torque by manually power via screwdriver shank And it is applied on screw.

Reference signs list:

1 screwdriver

2 shanks

3 tool units

4 driving equipments

5 operating elements

The safety clutch device of 6 torques switching

7 loading moments lock

8 transmission devices

9 energy storage devices

10 motors

11 clamping bodies

12 annular circulating rings

13 rolling elements

14 output shafts

15 gaps

16 fixing elements

17 insulating covers

Claims

1. a kind of screwdriver (1), including

Shank (2) with longitudinal axis, the tooling order that there is the shank direction longitudinally to extend in one end thereof First (3)；With

Driving equipment (4), the driving equipment have motor (10) and loading moment lock (7), lock energy via the loading moment It is enough to couple the motor (10) with the tool unit (3),

It is characterized in that, the screwdriver (1) has torque between loading moment lock (7) and the tool unit (3) Limits device, the limits value of the torque restricting means are greater than the maximum output torque of the driving equipment (4).

2. screwdriver (1) according to claim 1, which is characterized in that the maximum output torque of the driving equipment (4) is 0.7 Newton meter or less than 0.7 Newton meter.

3. screwdriver (1) according to claim 1, which is characterized in that the maximum output torque of the driving equipment (4) is small In 0.6 Newton meter.

4. screwdriver (1) according to claim 1, which is characterized in that the maximum output torque of the driving equipment (4) is small In 0.5 Newton meter.

5. screwdriver (1) according to any one of claim 1 to 4, which is characterized in that the screwdriver (1) has exhausted Edge lid (17), the insulating cover is by the end for being provided with the tool unit (3) in the screwdriver (1) of the screwdriver (1) The electrically conductive component at place is externally electrically insulated.

6. screwdriver (1) according to claim 5, which is characterized in that the electrically conductive component is the tool unit (3) And/or output shaft (14).

7. screwdriver (1) according to claim 6, which is characterized in that the tool unit (3) can be with the output shaft (14) it couples or is constituted one-piece with the output shaft (14).

8. screwdriver (1) according to any one of claim 1 to 4, which is characterized in that tool unit (3) construction For driver head rack or be configured to the maximum output torque ratio of screw blade and/or the driving equipment can be by the shank (2) torque provided manually is smaller.

9. screwdriver (1) according to any one of claim 1 to 4, which is characterized in that tool unit (3) construction For driver head rack or be configured to the maximum output torque ratio of screw blade and/or the driving equipment can be by the shank (2) torque that the ergonomic department of the Chinese Academy of Sciences provides manually is smaller.

10. screwdriver (1) according to any one of claim 1 to 4, which is characterized in that the tool unit (3) has Fixing element (16) is for the fixed screwdriver bit that is fitted into or can be fitted into the tool unit (3), wherein the fixing element (16) it is made of electrically insulating material.

11. screwdriver (1) according to claim 10, which is characterized in that the fixing element (16) is by plastics or rubber It constitutes.

12. screwdriver (1) according to claim 10, which is characterized in that the fixing element (16) is configured to O-ring.

13. screwdriver (1) according to any one of claim 1 to 4, which is characterized in that the screwdriver (1) has energy The completely insulated screwdriver bit or multiple one group of screwdriver bit can be inserted into, completely insulated being inserted into the tool unit (3).

14. screwdriver (1) according to any one of claim 1 to 4, which is characterized in that the motor (10) is configured to Electric motor and/or the driving equipment (4) have monitoring unit, and when the motor reaches blocking site, the monitoring is single Member turns off the motor (10).

15. screwdriver (1) according to any one of claim 1 to 4, which is characterized in that the motor (10) is configured to Electric motor and/or the driving equipment (4) have monitoring unit, and the monitoring unit reaches blocking site in the motor Delay ground turns off the motor (10) later.

16. screwdriver (1) according to claim 15, which is characterized in that the monitoring unit is reached in the motor to be hindered Stagnating bit turns off the motor (10) after setting after 2 seconds.

17. screwdriver (1) according to any one of claim 1 to 4, which is characterized in that the torque restricting means tool There are +/- 10% precision and/or loading moment lock (7) to be configured to pinch roll loading moment lock.

18. screwdriver (1) according to any one of claim 1 to 4, which is characterized in that the torque restricting means tool There are +/- 6% precision and/or loading moment lock (7) to be configured to pinch roll loading moment lock.

19. screwdriver (1) according to any one of claim 1 to 4, which is characterized in that the screwdriver (1), which has, shines Bright device and/or the driving equipment (4) and/or energy storage device (9) setting are internal in the shank (2).

20. screwdriver (1) according to claim 19, which is characterized in that the lighting device and/or the motor can It is turned on and off by operating element (5).

21. screwdriver (1) according to claim 20, which is characterized in that the operating element is configured to swivel becket.

22. screwdriver (1) according to claim 20, which is characterized in that the motor (10) can be with being delayed described It is connected after lighting device.

23. screwdriver (1) according to claim 19, which is characterized in that the energy storage device is replaceable energy Reservoir.

24. screwdriver (1) according to any one of claim 1 to 4, which is characterized in that the tool unit (3) can By the driving equipment (4), around longitudinal axis, driving and/or the driving equipment (4) have transmission clockwise and/or counterclockwise Device (8).

25. screwdriver (1) according to any one of claim 1 to 4, which is characterized in that the torque restricting means structure Make the safety clutch device (6) for torque switching.

26. screwdriver (1) according to claim 25, which is characterized in that the torque restricting means be configured to sliding from It attaches together and sets or be configured to lock body arrangement of clutch.