EP1778440B1 - Battery-driven screwdriver - Google Patents

Description

State of the art

The present invention relates to a cordless screwdriver according to the preamble of claim 1. Such a cordless screwdriver is for example from the US 6,206,538 known.

There are already cordless screwdrivers in the performance class between 2.4V to 3.6V, such as from the EP 1 066 930 These usually have several NiCd cells as energy storage, an on-off switch with a short button and stepless speed control and a switch for switching from left to right, a motor speed reducing gearbox, in particular planetary gear, and a motor with a standard Diameter of 27.mm. There are rod-shaped and pistol-shaped versions as well as versions with angle-adjustable handle. These devices are connected to the charger for charging either via a plug - much like a cell phone or a razor - or via a holder with contacts, into which the battery is put 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 difference of the new charge amount is available due to the memory effect after the charging process - and thus a reduced power.

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

In known cordless screwdrivers with electrical auxiliary functions, such. B. built-in work lights, they are so far either separately with its own switch or actuator or synchronous 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 secondary function 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 a plurality of 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 off position of the switch button actually all the 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 circuit interrupted and thus the unwanted discharge of the battery can be excluded.

Characterized in that in the second switching state at a certain stroke of the switch button closed the power circle for the work lights and in the third switching state at a further additional stroke of the switch button power to the motor is switched on, depending on Tastenhubposition the work lights alone or activated together with the engine rotation become.

The fact that a relatively large, hard spiral spring biased to keep the switch button in your off position, their rapid return from the switch-on to the off position is secured and each of the three switching states defined neatly adjustable.

The long, over almost the length of the inside of the handle extending switch button has an actuating Schwenkhub associated with at least two switching positions. This means - regardless of the operating position - only low operating forces needed and the device is conveniently controlled in almost every position of the operator's 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 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 appropriate screw or Bohrbits with hex shank - these tools are quick and easy to change.

Since the lithium-ion battery has almost no self-discharge, the cordless screwdriver is fully operational even after long periods of use, during use breaks the cordless screwdriver can rest for as long as desired on a charging cradle in charging mode. The charging tray is stable on a flat shelf adjustable and does not need to be fixed and not be held 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 position-secure inside the half-shell-like handle areas, wherein at its end two welded tabs 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 switch, of charging contact tongues, a switch for the direction of rotation circuit and three LEDs for the two direction indicators and a charge control lamp and control means of the charging and discharging the lithium-ion batteries. Arranged longitudinally inside the handle, 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 standard in this class box-like on-off switch, which also has a respective position for clockwise or counterclockwise rotation, the concept of separate right / left rotation preselection 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 - over the usual slider by hand controlled and thus created a simply constructed direction of rotation switch.

The switch button and the direction switch are designed so that on the one hand while holding down the switch button is locked and can not be moved and on the other hand, the button is locked and can not be pressed in the on position when the direction switch in its middle position, the recommended transport position, stands.

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 board lights up. These are visible in the housing by means of transparent plastic part as a window covered arrow-shaped openings. An arranged between the arrow-shaped openings, visible through a rectangular opening charge status indicator shows by slower or faster flashing, if 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 slim and compact with small corners (spindle axis to the outer contour). 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 axial securing 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 shear for the separately deliverable transmission. The disc is held in the installed state in 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 into the wells by pressing.

The planetary gear is provided with an autolock system, ie with self-locking output spindle when turning the same by force application from the outside. Its gear housing has motor side top and bottom axial extensions with an annular groove and a torus.

In this annular groove engage annular beads of the half-shells of the motor housing, which have a corresponding counter-profile. Thus, the gear housing is accommodated and fixed axially without further components such as screws, rivets or latching tongues. Laterally, where the gear has recesses between these extensions, axial counter extensions of the half shells protrude. This arrangement serves to prevent rotation of the gear housing relative to the motor housing - without the use of separate components. The axial extensions are asymmetrical to ensure a clear installation.

The gear housing, the circuit board with battery, motor, LEDs and electrical elements and the switch lever with contact plate and springs and the transparent plastic part are 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 keep the device from the gear housing or the adjacent motor housing so in one hand, while holding with their index finger a screw on the bit, at the same time the large-scale on-off button conveniently with the remaining fingers is operable, and also the free hand can hold the workpiece.

The large rubber jacket with nub surface over the entire grip 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.

• Figur 1 eine Seitenansicht des teilweise geöffneten Akkuschraubers
• Figur 2 eine Explosions-Teildarstellung des Akkuschraubers
• Figur 3 eine weitere Explosions-Teildarstellung der Hauptbaugruppen des Akkuschraubers
• Figur 4 eine Draufsicht von oben auf den in der Ladeschale positionierten Akkuschrauber
• Figur 5 einen vergrößerten Ausschnitt des Getriebegehäuses aus Figur 1
• Figur 6 eine räumliche Ansicht der Ladeschale als Einzelheit von oben
• Figur 7 eine Matrix mit den Schaltzuständen der Haupt- und Nebenfunktionen des Akkuschraubers,
• Figur 8 eine räumliche Darstellung der Platine mit Akku, Schaltern und LEDs
• Figur 9 eine weitere Seitenansicht des teilweise geöffneten Akkuschraubers und
• Figur 10 die linke Seitenansicht des Akkuschraubers.

Show it

• FIG. 1 a side view of the partially opened cordless screwdriver
• FIG. 2 an exploded partial view of the cordless screwdriver
• FIG. 3 another exploded partial view of the main components of the cordless screwdriver
• FIG. 4 a top view from above of the positioned in the charging tray cordless screwdriver
• FIG. 5 an enlarged section of the transmission housing FIG. 1
• FIG. 6 a spatial view of the charging cradle as a detail from above
• FIG. 7 a matrix with the switching states of the main and auxiliary functions of the cordless screwdriver,
• FIG. 8 a spatial representation of the board with battery, switches and LEDs
• FIG. 9 another side view of the partially opened cordless screwdriver and
• FIG. 10 the left side view of the cordless screwdriver.

Description of the embodiment

FIG. 1 shows a pistol-type cordless screwdriver 10 with aligned to the screw motor housing 12 and thereof angled handle 14. The motor housing 12 with handle 14 is formed of two half-shells 16, 17 which in a central plane 15 (FIGS. Fig. 4 ) are tightly joined together. For this purpose, four screws engage through holes of a half-shell 17 in four screw domes 19 of the other half-shell 16 and hold both firmly together, in FIG. 1 the upper or right half-shell 17 is removed, so that the view of the interior of the housing 12, taken alone from the left half-shell 16, is free.

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

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 the switch button 26 like a bay, leader closely. The outwardly protruding from the inlet opening 29 of the housing 12 switch button 26 is configured as accessible from the outside for the operating lever pivot lever and communicates inside the handle 14 with two separate switches 32, 34. It is limited to a pivot axis 30 pivotally mounted in the axle holder 31 in that it carries on the opposite end of the pivot axis 30 a stop tongue 27 which engages behind the entry opening 29 for the Schaltasteasteaste 26 inside the handle 14 so that they secured against accidental emergence from the housing 12 beyond its off position and against loss is.

The switch button 26 engages with a centering and guide pin 263 on its back in a compression spring 28 which is supported adjacent inside the handle 14, 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 elongated, in the interior of the handle 14 extending board 36 adjacent to the back of the switch button 26 in a mutual longitudinal distance 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 in the depression and pivotal movement about the pivot axis 30 are successively triggered. Upon depression, first the switch cam 261 contacts the switch key 320 of the first (main) switch 32 and thus closes the circuits previously held broken by the switch 32, thereby providing one or more slave functions, e.g. the lighting 80 is turned on. Upon further depression of the upper switching cam 262 comes into contact with the short switch button 340 of the second switch 34 and thus closes the previously interrupted by the switch 34 main circuit for powering the motor 46 so that this turned on when the lighting 80 or more electrical auxiliary functions turns.

It is secured by an unspecified electronic circuit inside the housing 12 that the state of charge indicator 75 in the upper portion 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 is displayed as a secondary function.

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 has a passage opening for each one of the loading contact tongues 37. These are embedded at each passage point in a respective depression within the handle contour "sunk" and for outwardly projecting charging contacts 23rd the charging tray 22 accessible, they overlap in the state of charge when placed on the charging tray 22 and due to their resilient arrangement securely contacted support it.

Furthermore, the board carries 36 approximately centrally, flat and near the surface unspecified noise resistors and capacitors and in the upper part of a slide switch 38 and at the upper end under each one from the back and arrowhead-like aperture or window 59 in the longitudinal direction two light-emitting diodes 57, 58 for optical indication of 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 shows the user of the cordless screwdriver by more or less fast flashing, if the battery is plentiful or only slightly charged. The LED 75 overlapping window carries a known from automotive technology pictograph of a gas pump with tank hose, which is known as a request for refueling and the user of the cordless screwdriver 10 unmistakably conveys 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. It is in this case unspecified, groove-like recesses of the two half-shells 16, 17 so clamped free of play that it is supported from the inside against the half-shells 16, 17 and thereby forms a reinforcing rib in the handle 14. Parallel to the circuit board 36 is inserted as a battery 40 lithium ion cell with the known advantages in the handle 14, which is gripped by the two half-shells 16, 17 in the mounting state and secured in position and thus integrated into the strength structure of the housing 12. The battery 40 has at the top and bottom each serving as a solder tag contact plate 42, 43, which is wired to the circuit board 36.

Close above the switch button 26 and within reach of the fingers of the operating hand is in the gusset between angled handle 14 and motor housing 12, a slide switch 39 (FIG. Fig. 2 ) transversely to the center plane 15 of the motor housing 12, guided by not designated, lateral openings of the half-shells 16,17, arranged back and forth. The sliding switch 39 engages with a fork-like extension 390, not shown, a sliding member 41 (FIG. Fig. 2 ) of the box-like, in the upper region of the board 36 fixed slide 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 - Transport of the cordless screwdriver 40, for example in the pocket of the user - adjustable in a central position. In the center position, the extension 390 of the sliding switch 39 locks the switch button 26 so far that it can 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 their assembly and in its working position, aligned parallel to the inserted in the motor housing 12 gear housing 18 aligned. The motor 46 has a rear and front stepped motor collar 48, 49 (FIG. Fig. 3 ), from which the rear and front end of the motor shaft 45 exits. The motor 46 is mounted supported centered about 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-fold, in particular formed, and thus engages in the mounting position in a corresponding flattened recess of an input pinion 66 of the arranged in the transmission housing 18 gear 65, which is designed as a planetary gear. For a frictional clutch with coarse dimensional tolerance and ease of installation is created, the motor 46 with the gear 65 and the gear housing 18 is easily plugged together and plugged together for further assembly in one of the half shells 16, 17 can be inserted.

On the front side, the two half-shells 16, 17 engage in a forceps-like and form-fitting manner a transmission housing 18 mounted as a separate cylindrical assembly and hold it free of play. This has in two axial, to the motor housing 12 extending, tongue-like, partially cylindrical extensions 60 ( Fig. 3 ) a Gehäuseringnut 54, which is bounded by an 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, at 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 directional arrow - or the red light emitting diode 57, 58 - in the form of a backward arrow - releases, depending on a direction of rotation of the motor shaft 45 ( Fig. 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 flashing when the switch 32 is turned on, more or less "energy reserve" in the battery 40.

From the tapered from a rounded cone gear housing 18 passes from an output spindle 20 which is frontally designed as a hexagon socket 21 for receiving matching standard bits. The hexagon socket 21 is provided with means that hold the inserted screw bit or bit against loss, so that for their axial removal of a certain resistance by hand must be overcome.

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 viewing direction right-side opening 840, the bore 84 is widened stepwise and there takes the lens 82 on captive. The LED 86 is connected via an along the inner wall of the motor housing 12 in the bore 84 leading electrical line 88 to the battery 40 and the first switch 32 and - as already explained - by pressing the switch 32 switched.

The diffusing screen 82 is designed as an optical lens, in particular as a Fresnel lens, and arranged such that light emitted by the LED 86 is directed at an angle upwards and in the middle in the vicinity in front of the output spindle 20 or against the screw received by the hexagon socket 21 or Bohrbit 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 top in the rear area arranged window 59 for the direction of rotation display 57, 58 and the state of charge indicator 75th

In the viewing direction to the left of the half shell 17, 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 the electric line 88 for the workstation lighting 80th Die LED 75 is connected to an unspecified circuit, which serves to control the state of charge and accordingly the LED 75 with higher or lower flashing frequency drives. Above the inlet opening 29 for the switching button 26 sits the transversely to the longitudinal axis of the cordless screwdriver 10 geradverschiebbare slide button 39 for rotation adjustment of the motor 46. The slide button 39 is again arranged as a detail in the viewing direction right above, the fork-like extension 390 for engaging behind the switching member 41 of the Scheibeschalters 38 is recognizable.

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 compression spring 28 are visible.

On the opposite side of the pivot axis 30, the switching button 26 has a stop tongue 27, on the one hand prevents detachment of the switch button 26 from the inlet opening 29 and on the other hand when depressing the switch button 26, the slide switch 39 locked in its currently selected position or on the other hand in the center position of the slide switch 39 prevents the depression of the switch button 26, so this locked.

FIG. 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 above-described details, only the motor 46 with the rear and front engine 48, 49, and the motor shaft 47 with the flattened end 45 may be mentioned. The end 45 of the motor shaft 47 is provided for entry into a central, not shown, slot in the input pinion 66 and for its rotational drive and thus for driving a transmission housing 18 arranged in the transmission 65. The gear housing 18 clearly shows the motor housing 12 facing, axial extensions 60 with the annular beads 55 and the annular grooves 54 which are pliers-like by corresponding counter-geometries of the facing ends of the half-shells 16, 17 of the motor housing positively gripped and fixed in position. 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 top view of the charging tray 22 with ready-laid battery-operated screwdriver 10, wherein on the previous illustrations, a laterally next to the cordless screwdriver 10 positively and non-positively halterbarer, removable bit holder 99 can be seen. This has incorporated insertion openings 95 for captive capturing Schraubbits 93 and is in a groove 98 flush with the charging tray 22 in this insertable or by taking his finger in the extension 96 of the groove 98 easily removed from this. It can be comfortably carried along with the cordless screwdriver 10 by the operator - for example in his trouser pocket.

In axial extension to the front, the charging shell 22 has three stationary insertion openings 73 in which additional bits or the like can be carried 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 portion of the cordless screwdriver 10 with the lower half-shell 16 with a view of the motor 46 and the gear housing 18, which are positively connected with each other interlocking.

FIG. 6 shows a top view of another embodiment of the charging cradle 220 with an embedding 25, which is divided into a handle bed 251 and a gear housing bedding 252, in which the cordless screwdriver 10 is flush and almost no play clearly and foolproof inserted so that it rests securely and its charging contact tabs 37 ( FIG. 1 . 2 . 3 ) maintain safe contact with the charging contacts 23 of the charging cradle 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 protrude from the contour of the charging tray 23 in the region of the handle bedding 251 into which the cordless screwdriver 10 engages with its handle 14 and is supported with its own weight with its charging contact tabs 37 on the resilient charging contacts 23 of the charging shell 22. Simply by placing the cordless screwdriver 10 on the charging shell 220 immediately adjusts the state of charge with audible click.

The charging tray 220 has in the direction of viewing the front left a recess 51 for the exit of an unspecified electrical cable, in the rear, the handle 14 of the cordless screwdriver 10 associated area a charging indicator 71 and a vertical insertion opening 730 for captive mounting a standard screw or Bore bits with hex shank carries.

In the FIG. 7 shown matrix shows the switching states of the circuits for the main and secondary functions of the cordless screwdriver 10 and gives a systematic overview and explanation of which functions depending on the actuation stroke of the switch button 26 - see first column - expire, for example, that the direction of rotation not at half but only at fully depressed switch button 26 is displayed - in contrast to the workstation lighting 80, which is already lit when the switch button 26 is pressed halfway (1/2).

It can also be seen that the LED 75 for charging indicator glows green when the cordless screwdriver 49 is on the charging tray 22 or when charging current flows and goes out when the shift key 26 is pressed.

In the FIG. 8 shown spatial representation of the board 36 with battery 40, the switches 32, 34, 38, the LEDs 57, 58, 75 and the charging contact tongues 37 illustrates again clearly the explanations FIG. 1 ,

The LED 75 can be designed as a double LED or arrangement of two individual LEDs next to each other. The LED 75 indicates the state of charge only - in the color red - 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 with stronger discharge of the battery 40 a particularly fast flashing of the red A slower flashing gradually informs about the charge status 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 in the cordless screwdriver 40 no charge current flows.

An in FIG. 9 shown further side view of the cordless screwdriver 10 with disassembled half shell 17 illustrates again the comments FIG. 1 in particular, the design of the switch button 26 for sequential operation of the two switches 32, 34 should be emphasized.

In the FIG. 10 shown left side view of the cordless screwdriver 10 with a view of the outside of the left half shell 16 shows the details according to FIG. 1 clearly, in particular the front side provided with two concave recesses 260, 261 outer contour of the switch button 26, one of the charging contact tongues 37, the cylindrical pin-like sliding switch 39 and from, the bottom of the gear housing 18, the contour of the opening 840 of the bore 84 of the workstation lighting 80. In addition, a Rubber sheath 11 with nub structure 110 in the lateral and rear region of the handle 14 with a lateral bead 111 recognizable.

Claims (9)

1. Battery-driven screwdriver comprising a housing (12, 18) with a handle (14) having an on/off switch button (26) and a battery (40) inserted therein, in particular fixedly, and having charging contact tongues (37) assigned to the battery (40), wherein a plurality of electric circuits of the battery-driven screwdriver (10) can be interrupted or closed in succession independently of one another by means of the switch button (26) via its actuating stroke, said switch button (26) extending in an elongated manner over the inner side of the handle (14), characterized in that the switch button (26) is pivotably mounted, and two switches (32, 34) are assigned to the switch button (26) and are arranged at a distance from one another in the longitudinal direction of the switch button (26) in such a way that the first switch (32) and the second switch (34) can be tripped in succession by actuating the switch button (26).
2. Battery-driven screwdriver according to Claim 1, characterized in that one of the electrical switches (32) serves as main switch for a plurality of electric circuits of the battery-driven screwdriver (10) and neutralizes the interruption of the electric circuits when the on/off switch button (26) is depressed, and in that the other electrical switch (34) forms a second interruption of the motor electric circuit, which is closed by further depression of the on/off switch button (26).
3. Battery-driven screwdriver according to Claim 2, characterized in that the electrical switches (32, 34) interrupt the electric circuits assigned to them when the on/off switch button (26) is released.
4. Battery-driven screwdriver according to one of the preceding claims, characterized in that one of the switches (32) serves as interrupter for working position light (80).
5. Battery-driven screwdriver according to Claim 1, characterized in that the switch button (26) is supported on the housing (12) in a prestressed manner against the actuating direction by means of a helical spring (28) and is pivotably mounted about a pivot axis (30, 31).
6. Battery-driven screwdriver according to Claim 1, characterized in that only a single, elongated, slim lithium-ion (Li-ion) cell is arranged as battery (40) in the handle (14).
7. Battery-driven screwdriver according to Claim 1, characterized in that a slide switch (38) which is actuated via an, in particular longitudinally displaceable, slide button (39) is arranged on the board (36) for changing over from clockwise to anticlockwise rotation.
8. Battery-driven screwdriver according to Claim 1, characterized in that the slide switch (38) is locked when the switch button (26) is depressed, and in that the switch button (26) is locked when the slide button (39) is in the centre position.
9. Battery-driven screwdriver according to Claim 1, characterized in that a large-area rubber sheath (11) projecting laterally in a bulging manner and having a stud structure (110) is arranged on each half shell (16, 17) in the region of the handle (14).

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