EP1778440A1

EP1778440A1 - Battery-driven screwdriver

Info

Publication number: EP1778440A1
Application number: EP05756828A
Authority: EP
Inventors: Guenter Lohr; Heiko Roehm; Wolfgang Hirschburger
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2004-08-09
Filing date: 2005-06-29
Publication date: 2007-05-02
Anticipated expiration: 2025-06-29
Also published as: EP1778440B2; CN101001721A; CN101001721B; WO2006015909A1; EP1778440B1; US7498526B2; DE502005007430D1; US20070256914A1; DE102004051913A1

Abstract

The invention relates to a battery-driven screwdriver comprising a housing (12, 18) provided with a handle (14), an on/off switch (26) and, particularly, a permanently fixed rechargeable battery (40) and charge contact tongues (37) which are associated with the rechargeable battery (40). The battery-driven screwdriver is characterised in that it is safe and comfortable to use due to the on/off switch (26) being mounted in a pivotable manner and extending in a longitudinal manner over the innerside of the handle (14), said on/off switch being able to be successively interrupted and/or closed, independently from each other, during the actuation stroke of several electric circuits of the battery-driven screwdriver (10).

Description

Cordless Screwdriver

State of the art

The present invention is based on a cordless screwdriver according to the preamble of claim 1. There are already cordless screwdrivers in the power class between 2.4V to 3.6V, as known for example from EP 1 066930. These usually have several NiCd cells as energy storage, an on-off switch with a short button and stepless speed control and ei¬ NEN switch for switching from left to right, a motor speed reducing gear, in particular planetary gear, and a motor with a Standard diameter of 27.5mm. There are rod-shaped and pistol-shaped designs as well as versions with an angle-adjustable handle. These devices are connected to charge either via a plug with the charger - similar to a cell phone or a razor - or a holder with contacts, in which the battery is placed to charge. The brackets are z. B. attachable to a wall to facilitate handling when loading. For this, the charging mode and the electrical connection must first be set to the charging mode, but this does not happen automatically after every use. As a result, the device is often not ready for use when it is needed, with the known memory effect added adversely. NiCd cells discharge after a certain time without power output and also unused cordless screwdrivers are partially discharged after a short time. If they are charged when they are partially discharged, only the memory will be charged after the loading process due to the memory effect

Difference in the amount of new load - and thus a reduced performance - available.

Another disadvantage of the known cordless screwdrivers is their voluminous size due to large assemblies, e.g. of the gearbox, the switch systems and the rechargeable batteries in the form of NiCd cells whose size "4/5 Sub-C" when placed in the handle affects the ergonomics and the usability because tight, angular screw locations are unreachable.

In known cordless screwdrivers with electrical auxiliary functions, such. B. built Ar¬ job site lighting, they are so far either separately with its own switch or Betä¬ tigungselement or synchronously with the switch of the main function, ie the engine switch, on and off. If the secondary function can be switched separately, the advantage is that, for example, the light can be switched on when needed and not permanently during operation of the machine consumed. The disadvantage is that previously a separate actuator must be operated. If this is not accidentally switched off, the battery will unintentionally discharge. This risk does not exist if the slave function is switched synchronously with the main function. In this case, however, the Nebenfunkrion can not be activated independently of the main function, which z. B. at a job lighting a screwdriver is beneficial.

Advantages of the invention

The invention with the features of claim 1 has the advantage that several circuits in the interior of the cordless screwdriver with a single switch button (on-off button) independently switched on or off and that in the switch-off position of the switch button actually all power consumers are turned off

The fact that at least three switching states are switchable when depressing or releasing the switch button, in the first switching state - as with a main switch - all Stromkrei¬ ses interrupted and thus the unwanted discharge of the battery can be excluded. Due to the fact that the power supply of the motor can be switched on in the third switching state with a further additional stroke of the switching drum in the second switching state at a certain stroke of the switching button, the workstation lighting can be alone or jointly with the key stroke position the Motordre¬ Hung be activated. Due to the fact that a relatively large, hard spiral spring tries to keep the switch key pretensioned in its switch-off position, its rapid return from the switch-on position to the switch-off position is ensured and each of the three switch states can be set in a clearly defined manner.

The long, almost over the length of the inside of the handle extending switch button has a Betätigungskugelhub, the at least two switching positions are assigned thereby - regardless of the operating position - only low operating forces needed and the device is conveniently controlled in almost every position of the operating hand switched on.

Because the engine shaft end associated with the transmission has a flattening and the corresponding engagement opening of the transmission input shaft has the corresponding negative shape, a simple, easily assembled, compact clutch is created between the engine and the transmission, which also permits rough tolerances and thereby works reliably. Due to the fact that the motor housing consists of centrally divided half-shells which grasp the cylindrical gear housing with radially inwardly projecting support tongues from both sides and hold centered in the mounting position, the gear housing is precise and safe without separate fastening or guide elements such as screws, centering pins or latching elements connectable to the motor housing.

Further weight and volume reduction of the cordless screwdriver is achieved by dispensing with a chuck, which by means of hexagon socket of the output shaft - suitable for corre sponding screw or drill bits with hex shank - these tools are quickly and easily changed. Since the lithium-ion battery has almost no self-discharge, the cordless screwdriver is fully operational even after long periods of use, with the cordless screwdriver being able to rest for as long as desired on a charging cradle in charging mode during breaks in use. In this case, the charging stand is reliably adjustable to a flat storage area and does not have to be fastened and also not held fast when the cordless screwdriver is removed. As a result, he is always ready for removal with only one hand, with no plug pulled or no holder must be removed. In addition, it is always automatically ensured that the cordless screwdriver is charged.

The compact lithium-ion battery sits backlash-free in a secure manner inside the half-shell-like handle areas, wherein at its end areas two welded contact lugs are soldered to electrical leads to the board. It is integrated in the strength structure of the handle and increases its stiffness with low material usage for the

Half shells of the housing.

The board provided for the control is a chassis of a main and a viewer, of charging contact tongues, a switch for the direction of rotation circuit and of three LEDs for the two direction indicators and a charge control lamp and of control means of charging and discharging the lithium-ion batteries , Longitudinal inside the

Handgrip arranged and the board is integrated as an additional transverse rib in the strength structure of the housing or the handle and increases its flexural rigidity.

Instead of a conventional box-type on-off switch, which also has one position for clockwise or anticlockwise rotation, the concept of a separate right-to-left forward-stop dialing code was adopted. While in previous drills to a separate assembly is placed on the box-like main switch, here is soldered to the board, easier and Cost-effective slide switch, eg mass-produced goods from the electronics trade - can be controlled manually via the usual slide and thus creates a simply constructed direction of rotation switchover.

The switch button and the direction switch are designed so that on the one hand pressed

Switching the direction of rotation switch is locked and can not be moved and the other ren the switch button is locked and can not be pressed in the on position when the direction switch is in its center position, the recommended transport position.

The soldered on the board charging contact tongues protrude through openings in the lower end of the handle and are contacted in charging position of mating contacts of the charging tray, with no additional cables or coupling plug must be pressed.

Depending on the direction of rotation of the motor, a green or red LED soldered to the circuit board lights up. These are visible in the housing through arrow-shaped openings covered by a transparent plastic part as a window. A charge state indicator arranged between the arrow-shaped openings and visible through a rectangular opening shows by slower or faster flashing whether the battery is more or less fully charged

The gear housing is also the outer wheel of the planetary gear. As a result, an additional component is saved and the device is slim and compact with a small amount of corner (spindle axis to the outer contour). In this case, the tooth cross sections and the tooth height of the outer gear of the planetary gear (gear housing) at the same time stop a locking washer, which serves as an A- xialsicherung and forms the motor-side boundary of the planet gears of the first stage. The safety washer has two wings projecting over its circumference, which can be locked in a manner similar to a bayonet catch in two corresponding recesses of the transmission housing and can be secured against axial loosening by turning in a subsequent annular groove. This is at the same time a transport security for the separately deliverable transmission. The disk is held in the installed state each case by their wings between the engine and the transmission housing. It is also a lock washer with protruding, angled wings used, which are securable in the recesses by pressing.

The planetary gear is provided with an autolock system, ie with self-locking Ab¬ drive spindle when turning the same by force attack from the outside. Its gear housing be¬ sits motor side up and down axial extensions with an annular groove and a torus. Ih this annular groove engage annular beads of the half-shells of the motor housing, which have a corre sponding mating profile. Thus, the gear housing is accommodated and fixed axially without further components such as screws, rivets or latching tongues. Laterally, where the gear mechanism has recesses between these extensions, axial counter-extensions of the half-shells project into it. This arrangement serves to prevent rotation of the gearbox housing relative to the motor housing - without the use of separate components. The axial extensions are asymmetrical to ensure clear installation.

The gear housing, the circuit board with battery, motor, LEDs and electrical elements and the switch handle with contact plate and springs and the transparent Kuπststofiteil be placed in a first half-shell, closed with the second half-shell and closed with only four identical screws and thus completely assembled and yielded a cost effective solution.

The compact design makes it possible to hold the device in front of the gear housing or on the adjoining motor housing in one hand in such a way that a screw is held onto the bit with its index finger, whereby at the same time the large-area switch-on and switch-off Button can be easily operated with the other fingers, in addition, the free hand can hold the workpiece.

The large rubber jacket with nub surface over the entire handle area allows the cordless screwdriver to be fitted particularly securely in the operating hand.

drawings

The invention is explained in more detail with reference to an embodiment with associated drawing.

Show it

Figure 1 is a side view of the partially opened cordless screwdriver

Figure 2 is an exploded partial view of the cordless screwdriver Figure 3 is a further exploded partial view of the main components of the cordless screwdriver

Figure 4 is a plan view from above of the positioned in the charging tray cordless screwdriver Figure 5 is an enlarged detail of the transmission housing of Figure 1 Figure 6 is a perspective view of the charging tray as a detail from above FIG. 7 shows a matrix with the switching states of the main and auxiliary functions of the cordless screwdriver,

Figure 8 is a three-dimensional view of the board with battery, switches and LEDs Figure 9 is another side view of the partially opened Akkuschraύbers and Figure 10 is the left side view of the cordless screwdriver.

Description of the embodiment

FIG. 1 shows a pistol-type cordless screwdriver 10 with a motor housing 12 aligned with the screwing direction and handle 14 angled therefrom. The motor housing 12 with handle 14 is formed from two half shells 16, 17 that can be joined together in a central plane 15 (FIG are. For this purpose, four screws engage through holes in one half shell 17 in four screw domes 19 of the other half shell 16 and hold both firmly together, in Figure 1, the upper or right half shell 17 is removed, so that the view of the interior of the housing 12, alone taken from the left half shell 16, is free.

On the handle 14, a switch button 26 is arranged extending over a large area of its front end face, which, because of its large length, permits convenient switching on and off, even in difficult holding positions of the operating hand of the cordless screwdriver 10.

To enter the switch button 26 in the motor housing 12, a corresponding half each in the half shells 16, 17 arranged opening 29 is provided, which engages around the switch button 26 like a bay, leader closely. The out of the Eiαtrittsöffhung 29 of the housing 12 outwardly projecting button 26 is accessible from the outside for the operator's hand

It is configured pivotally mounted in the axle holder 31 about a pivot axis 30, wherein it carries on the opposite end of the pivot axis 30 a stop tongue 27, the Entrance opening 29 for the Schaltasteaste26 in the interior of the handle 14 lockingly engages behind, so that it is secured against accidental emergence from the housing 12 beyond its off position and against loss.

The switching button 26 engages with a centering and Führangsdorn 263 on its back in a compression spring 28, which is adjacent to the inside of the handle 14 is supported, so that when released from a switch-on position, the switch key 26 automatically returns to its off position in which the motor movement is stopped and all previously activated slave switch functions, eg the workstation lighting 80, the rotation direction indicators 57, 58 or the charge status indicator 75 are switched off. The actuating stroke is about 4 mm long in the middle of the switching button 26 and thus short and user-friendly.

The two switches 32, 34 are arranged on an elongate, extending in the interior of the handle 14 board 36 close to the rear of the switch button 26 in a GE¬ longitudinal spacing of about 20 mm and parallel to the center plane 15, wherein the switch button 320, 340 by switching cam 261, 262 of the switch button 26 at de¬ Ren depression and pivoting movement about the pivot axis 30 successively aus¬ are releasable. Upon depression, first the switching cam 261 comes into contact with the switching button 320 of the first (main) switch 32 and thus closes the circuits previously interrupted by the switch 32 so that one or more auxiliary functions, e.g. the lighting 80 is turned on. Upon further depression, the upper switching cam 262 comes into contact with the short switching button 340 of the second switch 34 and thus closes the main circuit, which was previously interrupted by the switch 34, for the power supply of the motor 46, so that it turns on when the lighting is switched on. rotates further switched electrical Nebenfunktio- nen.

In this case, it is ensured by an unspecified electronic circuit in the interior of the housing 12 that the charge status indicator 75 in the upper region of the housing 12 is not switched on when the engine is in operation 46 and not lit, while the direction of rotation display 57, 58 displayed as a secondary function becomes ¹ .

In addition, the board 36 carries in its lower region two symmetrically arranged charging contact tongues 37, which emerge at right angles from the flat side of the board 36 and then each form an outwardly angled large contact surface at the end. For this purpose, each half-shell 16, 17 symmetrical to the center plane 15 in the lower end of the handle 14 Griff¬ a passage opening for each of the charging contact tongues 37. These are at each point of passage in each well within the Handgrifßkontur "sunk ^ ^ embedded and protruding outward Charging contacts 23 of the charging tray 22 accessible borrow, they overlap in the state of charge when placed on the charging tray 22 and auf¬ reason of their resilient arrangement securely contacted support it.

Furthermore, the board 36 carries approximately centrally, flat and near the surface unspecified noise and capacitors and at the top of a slide switch 38 and at the upper end, each with a forward or rear arrowhead-like aperture or window 59 in the longitudinal direction aligned two light emitting diodes 57, 58 for optical An¬ show the direction of rotation and centrally between these a rectangular window, under which another LED 75 sits, which serves as a charge status indicator and the user of the cordless screwdriver by more or less fast flashing shows whether the battery reich¬ Lich or only slightly charged. The LED 75 overlapping window carries a known from automotive technology pictogram of a gas pump with tank hose, which is known as Auf¬ demand for refueling and unmistakably conveys the user of the cordless screwdriver 10 that the battery 40 must be charged.

The circuit board 36 is arranged with its longitudinal side parallel to the handle 14 and thereby with its narrow side transverse to the center plane 15. In this case, it is clamped so as to be free of play in unspecified, groove-like recesses of the two half-shells 16, 17 such that it is supported against the half-shells 16, 17 from the inside and thus forms a reinforcing rib in the handle 14. Parallel to the circuit board 36, a battery 40 lithium ion cell with the known advantages is inserted in the handle 14, which is gripped by the two half shells 16, 17 in the mounting state and secured in position, and thus into the strength structure of the housing 12 is integrated. The battery 40 has at the top and bottom in each case a soldering lug serving as contact plate 42, 43, which is wired to the board 36.

Close above the switching key 26 and within reach of the fingers of the operating hand is in the gusset between the angled handle 14 and motor housing 12, a sliding switch 39 (Figure 2) transverse to the center plane 15 of the motor housing 12, by non-designated lateral openings of the half-shells 16, 17 out, arranged back and forth. Of the

Sliding button 39 engages with a fork-like extension 390 (not shown) a sliding member 41 of the box-like, in the upper area of the board 36 fi¬ xierten sliding switch 38. The overlapped by the extension 390 sliding member 41 is by means of sliding switch 39 in the extreme left and right side position and - to Transport of the cordless screwdriver 40, for example in the pocket of the user - adjustable in a central position. In the middle position, the extension 390 of the sliding switch 39 locks the switch button 26 so far that it can only be actuated to switch on the workstation lighting 80 by means of the switch 32, but not the switch 34 for switching on the power supply of the motor 46.

A DC-powered motor 46 in the front region of the motor housing 12 is grasped like a pliers by the half-shells 16,17 after assembly and held in alignment in its Ar¬ play position, parallel to the inserted in the motor housing 12 gear housing 18 in alignment. The motor 46 has a rear and front step-like engine collar 48, 49 (FIG. 3), from which the rear and front end of the motor shaft 45 exit. The motor 46 is supported in a centered manner via its front and rear engine collars 48, 49 in corresponding bearing block-like ribs of the half-shells 16, 17. The front end 47 of the motor shaft 45 is provided with a flattening or with a two-plane, in particular deformed, and thus engages in the mounting position in a corresponding flattened recess of an input pinion 66 of the transmission 65 arranged in the gearbox housing 18, which is a planetary gear is designed. Thus, a positive coupling kraft¬ with gross dimensional tolerance and a simple fitting fen geschaf¬, wherein the motor 46 to the gear 65 and the gear case 18 easily ac- ^'' * is sammensteckbar and mated for further Montagein one of the half-shells 16 len, 17 is inserted.

At the front, the two half-shells 16, 17 engage around a gear housing 18 mounted like a separate cylindrical assembly, in the manner of tongs and in a form-locking manner, holding it free of play. This has in two axial, to the motor housing 12 extending, zungenar¬ term, partially cylindrical extensions 60 (FIG. 3) a Gehäuseringnut 54, which is bounded by ei¬ nem annular bead 55. The annular bead 55 engages in a matching Gegenringnut 56 inside of the end face of the half-shells 16, 17 of the motor housing 12, wherein mating Gegenringwulste 53 of the half-shells 16, 17 engage positively in the Gehäuseringnut 54 of the gear housing 18.

In the two asymmetrical recesses between the two extensions 60 of the gear housing 18 engage transversely to the longitudinal direction of the motor housing 12 angled counter-extensions 61 misfiring secure, backlash-free, the same time the bearing block-like Support motor collar 58 of the motor 46 centering, so that this is integrated into the strength structure of the motor housing 12. Separate fasteners such as screws or the like are unnecessary. This facilitates assembly with a reduced number of individual parts.

At the top behind the motor housing 12 carries the inserted transparent window 59, which extends longitudinally in the parting plane 15 and by three openings of the half-shells 16, 17 the view of the green light emitting diode in the form of a forward arrow - or the red light emitting diode 57, 58 - in the form of a backward arrow - releases, each associated with a direction of rotation of the motor shaft 45 (Figure 4) and illuminated with this.

In between, the third light-emitting diode 75 is arranged, which is designed as a double LED and which functions both as a charge and as a charge status indicator. When switching on the switch 34 or when the engine 46, this goes out automatically. If the cordless screwdriver 10 is in the charging mode, the charging indicator lights up red even when the shift key 26 is in its off position. If the battery 40 is partially discharged, the green charge status indicator informs, for example by more or less rapid blinking when the switch 32 is switched on, of more or less _5f energy reserve "in the battery 40.

From the front to a rounded cone tapered gear housing 18 enters the front, an output spindle 20, the front side as a hexagon socket 21 for receiving matching

Standard bits is designed. The hexagon socket 21 is provided with means which hold the inserted screw bit or bit against loss, so that a certain resistance has to be overcome manually for their axial removal.

A workstation lighting 80 has a diffuser 82 and an LED 86, which sit together in a bore 84 approximately vertically below the output spindle 20. The bore 84 extends parallel to the output spindle 20 through the gear housing 18. In the area of their front, in the direction of viewing located right Öffiiung 840, the bore 84 is widened stepwise and there takes the lens 82 on captive. The LED 86 is via a along the inner wall of the motor housing 12 in the bore

84 leading electrical line 88 connected to the battery 40 and the first switch 32 and - as already explained - by pressing the switch 32 switched. The diffusing screen 82 is embodied as an optical lens, in particular as a Fresnel lens, and arranged so that light emitted by the LED 86 is directed at an angle upwards and in the middle in the near zone in front of the output spindle 20 or in front of the inner hexagon 21 recorded screw or drill bit is focused on a potentially machined workpiece.

FIG. 2 shows an exploded view of the left half-shell 17 of the motor housing 12 with the window 59 for the direction-of-rotation display 57, 58 or the state of charge indicator 75 arranged at the top in the rear region.

The viewing direction to the left of the half-shell 17 is the circuit board 36 with the soldered battery 40 and the switches 32, 34, 38 and the light-emitting diodes 58, 57, which are electrically connected to the slide switch 38 and to the electric line 88 for the work The light-emitting diode 75 is connected to a circuit not shown in detail, which serves to control the state of charge and accordingly activates the LED 75 with a higher or lower flashing frequency. Above the entry opening 29 for the switching key 26, the sliding key 39, which can be moved straight transversely to the longitudinal axis of the cordless screwdriver 10, is seated for adjusting the direction of rotation of the motor 46. The sliding key 39 is arranged again as a detail in the top right viewing direction, with the fork-like extension 390 engaging behind Switching member 41 of the Scheibeschalters 38 can be seen.

In the direction of looking right, the switch button 26 is shown as a detail, wherein the pivot axis 30 for insertion into the axle holder 31 in the half shell 17, the cams 261, 262 for actuating the switches 32, 34 and the mandrel 263 for receiving the Druck¬ spring 28 visible are.

On the opposite side of the pivot axis 30, the switching button 26 has a stop tongue 27, which on the one hand prevents the switching button 26 from being released from the inlet opening 29 and, on the other hand, when the switching button 26 is depressed

39 locked in its currently selected position or on the other hand in the center position of the sliding switch 39, the depression of the switch button 26 prevents, so this locked. Figure 3 shows a further exploded view of the cordless screwdriver 10 with a view of the outside of the right half shell 16 of the motor housing 12 and the gear housing 18. In addition to the details explained above, only the motor 46 with the rear and front engine collar 48, 49, and the motor shaft 47 may be mentioned with the flattened end 45. The end 45 of the motor shaft 47 is provided for entry into a central, not shown, slot in the input yoke 66 and for its rotational drive and thus for driving a transmission housing 18 arranged in the transmission 65. The gearbox 18 clearly shows the axial extensions 60 facing the motor housing 12 with the annular beads 55 and the annular grooves 54, which can be grasped and fixed in a form-fitting manner by corresponding counter-geometries of the facing ends of the half-shells 16, 17 of the motor housing are. Moreover, the bore 84 located centrally below the output spindle 20 for receiving the LED 86 and the LED 86 itself can be seen as a detail of the workstation lighting 80.

FIG. 4 shows the plan view from above onto the charging shell 22 with the charge ready placed on it

Akkuschraüber 10, wherein on the previous illustrations beyond a laterally ne¬ ben the Akkuschraüber 10 positively and non-positively halterbarer, ent tolerable bit holder 99 is recognizable. This has incorporated Einstecköfmungen 95 for captive capturing of Schraubbits 93 and is in a groove 98 flush with the charging tray 22 in this insertable or by grasping with his finger in the extension 96 of the groove

98 easily removable from this. It can be conveniently carried by the operator together with the battery holder 10, for example in the back pocket.

In an axial extension to the front, the charging shell 22 has three stationary insertion openings 73 in which additional screw bits or the like can be secured against loss.

The top view of the cordless screwdriver 10 makes it possible to see particularly clearly the light-emitting diodes 57, 58 for the direction of rotation indication as well as the state of charge indicator 75 on its upper side and the center plane 15.

FIG. 5 shows a detail of the front region of the cordless screwdriver 10 with the lower half shell 16 with a view of the motor 46 and the gearbox housing 18, which are connected to one another in an interlocking manner. FIG. 6 shows a plan view from above onto a further embodiment of the loading tray 220 with an embedding 25, which is subdivided into a handle bed 251 and a transmission housing 252 into which the cordless screwdriver 10 can be inserted flush and virtually without play, in a clear and foolproof manner, so that it rests securely and its charging contacts 37 (FIGS. 1, 2, 3) maintain secure contact with the charging contacts 23 of the charging shell 220.

The outer contour of the charging shell 220 is inclined surface and thus the pistol-shaped inner or outer contour of the cordless screwdriver 10 aligned. The charging contacts 23 extend out of the contour of the charging tray 23 in the area of the handle gripping 251, into which the cordless screwdriver 10 engages with its handle 14 and, with its own weight, with its charging contact tongues 37 against the resilient charging contacts 23 of the charging unit shell 22 is supported. Simply by placing the cordless screwdriver 10 on the charging shell 220 immediately adjusts the state of charge with audible click.

The charging cradle 220 has in the viewing direction at the front left a recess 51 for the exit of an unspecified electrical cable, the rear in the handle 14 of the cordless screwdriver 10 associated area a charging indicator 71 and a vertical Einstecköffhung'730 for captive mounting a standard Schraub¬ or Drill bits with hex shank.

The matrix shown in FIG. 7 shows the switching states of the circuits for the main and auxiliary functions of the cordless screwdriver 10 and gives a systematic overview and explanation of which functions depend on the actuation stroke of the switching key 26 - see the first column - e.g. that the direction of rotation is not already at half but only when completely depressed switch button 26 is displayed - in contrast to the workstation lighting 80, which is already lit when the switch button 26 is half (1/2) operated.

It also follows that the LED 75 for charging indicator glows green when the electric screwdriver 49 is on the charging cradle 22 or when charging current flows and goes out when the switch key 26 is pressed. The spatial representation of the circuit board 36 with battery 40, the switches 32, 34, 38, the LEDs 57, 58, 75 and the charging contact tongues 37 shown in FIG. 8 clearly illustrates the explanations for FIG.

The LED 75 can be guided side by side as a double LED or arrangement of two individual LEDs. The LED 75 only indicates the state of charge - red in color - when the battery 40 is discharged to less than 1/3 of its total charge capacity and the switch button 26 closes the switch 32. If the switch button 26 is pressed further - to activate the switch 34 - the red warning display of the LED 75 goes out. The warning display can also be supplemented by a charge-current-controlled flashing device, so that the battery 40 emits more rapid flashing the red indicator and with less discharge a slower flashing gradually informed about the state of charge of the battery 40.

The green LED 75 only lights in the charging mode of the cordless screwdriver 40, i. when this is positioned in the charging shell 22 and charging current flows and goes out when 40 core charging current flows in the cordless screwdriver.

A further side view, shown in FIG. 9, of the cordless screwdriver 10 with disassembled half shell 17 illustrates again the explanations concerning FIG. 1, with particular emphasis on the design of the switching key 26 for the sequential actuation of the two switches 32, 34.

The left side view of the cordless screwdriver 10 shown in FIG. 10 with a view of the outside of the left half shell 16 clearly shows the details according to FIG. 1, in particular the outer contour of the switching button 26, one of the charging contact tongues 37, provided with two concave recesses 260, 261. the zylindersti ^'ftartig designed slide button 39 and the front, bottom of the gear housing 18, the contour of the opening 840 of the bore 84 of the Arbeitsstellen¬ lighting 80. in addition, a rubber shroud 11 having nub structure 110 in seitli¬ Chen and rear area of the handle 14 with a lateral bead 111 recognizable.

Claims

claims

1. cordless screwdriver having a housing (12, 18) with a handle (14) with an on-off button (26) and therein, in particular fixed, inserted battery (40) and with the battery (40) associated charging contact tongues (37), characterized in that by means of the elongated over the inside of the handle (14) extending, in particular pivotally mounted, shift key (26) over their operating stroke successively - optionally simultaneously - several circuits of the cordless screwdriver (10) are interruptible or closable independently.

2. A cordless screwdriver according to claim 1, characterized in that the on / off switch (26) has different, on its operating stroke successively achievable -, in particular separate, preferably two electrical, switches (32, 34) associated - actuating positions.

3. A cordless screwdriver according to claim 1, characterized in that the one electrical switch (32) serves as a main switch for several circuits of the cordless screwdriver (10) and on depressing the EüWAusschalttaste (26) cancels the interruption of the circuits and that the other electrical switch (34) forms a second interruption of the motor circuit, which is closed by further depression of the on / off switch button (26).

4. cordless screwdriver according to claim 2, characterized in that the electrical switch (32, 34) when you release the on / off button (26) assigned to them

Interrupt circuits.

5. A cordless screwdriver according to any preceding claim, characterized in that the one switch (32) serves as a breaker for a workstation lighting (80)

6. A cordless screwdriver according to claim 1, characterized in that the switching button (26) by means of a spiral spring (28) against the actuating direction biased on the housing (12) ab¬ supported and about a pivot axis (30, 31) is pivotally mounted.

7. cordless screwdriver according to claim 1, characterized in that only a single, elongated, slender lithium-ion (Li-ion) cell as a battery (40) in the handle (14) is arranged.

8. A cordless screwdriver according to claim 8, characterized in that for switching from right to left rotation on the board (36) a slide switch (38) is arranged, which is actuated via a, in particular longitudinally displaceable, sliding switch (39).

9. A cordless screwdriver according to claim 1, characterized in that when pressed Schalttas- te (26) of the slide switch (38) is blocked and that the switching load (26) is blocked when the slide switch (39) is in the center position.

10. A cordless screwdriver according to claim 1, characterized in that on each half-shell (16, 17) in the region of the handle (14) a large, laterally beaded protruding rubber jacket (11) is arranged with nub structure (110).