DE2741896A1 - DEVICE FOR THE MOTORIZED ADJUSTMENT OF REAR VIEW MIRRORS FOR VEHICLES, IN PARTICULAR MOTOR VEHICLES - Google Patents

Description

4 12 8

ftobart ioech GmbH • BOO Stuttgart

22.θ.1977

τ um mo to rl_8ch eri f I η η t. e M. e n of rearview mirrors

for fthneugo, lneheespecial car rides

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aifvi. Cino «alfe

ts

one of the children in Einyriff. The “clutch” is won by means of the forwarding of the motor in
Procedure coming «nn« ler «1 ml 'ι <ί. mu | i ^ Il * r; fi in engagement xu brin eendfnKuppiungeel ^ mentengffliM <(- «, · Μ · dl *» Anriibrsfslls d «r- * rt v * rec ?? lf? bon, d« n always * «» · »Fiii M« »1.1red vnn dtr drive skins is driven.

I a

4 12 5 '

The invention relates to a device for viewing Setting of rearview mirrors for vehicles, in particular Motor vehicles, luoboi a mirror carrier holding a mirror in a Schuienkpunkt around mindnatonn two standing perpendicular to each other nchiuenknchsnn mnl.nri tinh ochiuenkbar is.

While the Innonrürkblicksp I now I and, with reservations, the driver-side eye-sight level f 1 ^ 3 l · 1 n II Tnlirzeugea by the driver from the fifth seat from müliolus imuiutil.i J in a visible position, the E inntnl] ting of the beifahreraeitigen AuDonspJ ftqilv _(with Hrtm Immor mghr Kr "f · fnlirzougo equipped w"? rdnn and d ^ r bii AnhHngwrhrjtr 'oh MPiinmnd is vorgfjschriaben ₉ without dift auxiliary NTNR? r (UNITOR' n Pnrnnn inie> r ^ eifcreubsndas inputs and Auseteigsn tj »n Fshrere not possible, therefore κ © oün-8cheneiuert, at least the BRifnhrBrnnJ Ligen exterior mirror with a" mntorischon Eiri9tellvur ~ direction auazu * t * f-.trru "controllable from the driver's seat

A well-known motorized adjustment device of this type contains an electric motor in which the separate actuating drives rotate independently of one another about one of the two Schiuenkachspti. Λ ti Each motor is additionally equipped with a tTurifpfjatriciha wo rr | o - ■ r »h» »r», in order to achieve the necessary reduction for the fine adjustment of the mirrors. In particular, the Iiwiden orfonlnrl Iniinii IRotai'w with their additional checks wogon ^ / iiiKisgotr I nfiriii In ', ulnq such an adjustment device tnchiij · <ι: Ιι drove βιιΓιημμι · i | "Am I in the high pri?" for such Γηιπη Inr t * I 1 bare »Mil · MiMH r.pi ngol precipitated, eodaQ dips« Jii.nl mim »mim- in KmI I InIn Ίΐιιηη the obnrßn price class Rprion Maßin nl nijn ^ pt .. '(werclnu. hiillli. . also claimed eino such CJ rn hillvorr Jchtunn rrlnl Ή vl 'iunn dor riimli "In!" · lHitung J "· τ!?: ϊι Spinnei anne · t rr> li. l Baureum Dieff is flir the belo ·.'' · »· * 1 * * _ μ · ί short« llhm I r riutintuegi? Im Stollgstr and thus e.lnrs krimpe ·! ': T π, robu <»t ~>urn!''Ir> nt (| atör ^ nfr.lligo Ein · ntallvorrichtung zm rrrialpu.! · "·" (! π 'Γι τ Ί «^ γ1 icli -

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The invention is therefore based on the object of an adjusting device of the type mentioned to create, with a structurally simple structure, only a single drive motor contains for both pivoting directions of the mirror and is therefore inexpensive to manufacture and relatively small in size having.

This object is thereby achieved in accordance with the present invention solved that with the mirror support at least two adjusting shafts articulated, the ache of which are at a distance from the Schifsnkpunkt perpendicular to that spanned by the Snhwenkachsen Run plane and each cross one of the pivot axes, d «3 the adjusting shafts in each case in stationary, rotatably mounted Adjusting wheels can be screwed under axial displacement and de3 one connected to a reversible red inner motor stationary drive shaft and a clutch for optional engagement the drive shaft is provided with one of the adjusting wheels let.

The reduction of the linearity to only one rotary motor, which is carried out in accordance with the invention, is limited to a single reduction gear, not only means a “considerable cost, rmriIpimpn also lowers the volume of construction of the E inn tellvoi ι lc Mmn | This is very serious, so that the slight iflphr expenditure in the actuating gear, which is mainly caused by the clutch, can be weighted down. The volume of built-in space creates ideolw Vnrnii '"usefulness for accommodating the retraction device together with the f" pi "" q * l urid mirror carrier in the spiral housing, so that the motorized, adjustable outer mirror forms a compact unit. Such ophthalmoscope elgnnt nlcU ingenious and (irjlit: h a Nnchrüstaatz for vehicles, as euQor wordnn made for dio eloktrischan leads to dam Sniegol no mechanical EinqrjTfe in fahrzeuqkaros- vlo

17 I.

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4 I 7 5

In a preferred embodiment of the invention it is provided dnO (Hr Antriebswnl] «designed to be axially displaceable is and that on the Ant'r Jnlmwat I n twelv non-rotating with this one connected drive, each assigned to one of the actuators pinions are arranged at a distance from each other in such a way that only one drive pinion with the adjusting wheel assigned to it is engaged.

By providing two drives pinions for each Ainee the SchaltrBder is as possible despite spatially removed voneinender engeordnaten Stellendem wait axial Verachlaae-Mf e'er driveshaft very small · ** "* * nl% * # * i n4 ONi prajfctlseh on the necessary Veraehlafcew · «)« na Bn- & ■■. iringen von Btellred us * Antt (e * M * ltt «! L nu

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eahan are.

Wit this training of the clutch nlr * i «iurah Rctstinn Ai * Älbtriebswelle des motor in pnMtiv« adar ntigative! ^ R ^ riih ^ nn? automatically a gatrlabllnh "W ^ rbinding""" o the drive shaft and then one or the other of the b * iden Stsllra "rf" r established coupling first Jn "domestic rxinln VerachJrbung" r ^ r drive shaft in another direction d a od. transposed, and is indeed hergestollt so long until the vorstohond said geared connection. Then «Y n! Here exiele Verpchißbemigung the drive shaft peatoppt by Annnhliiqe and the Prohbewegung the Abtrtobsuinl 1 η ι- · ImI niiinnnhr übar the Stellrödor and the Stellu / ellen in a Vr>rpi;! ImnnkuniMiMiMiMiMi 'in a mirror implemented *

09 HI> / ii 17 i
ΘΑΟ ORIQIMAL

i ί 2 s

According to another embodiment of the invention and the Adjusting shafts ele dwarf-length worms formed, which are provided with old turning gears at each end.

This measure allows the mirror to rotate in a single direction ground the motor in any position Moved beyond the fendegttnge in the adjusting wheel, «obei the direction of movement of the screw in the turning maneuvers now turn around. In this embodiment of the invention, the direction of rotation of the motor and thus the drive shaft determines which of the two adjusting wheels in engagement with the drive shaft let and about which axis the mirror is pivoted.

A further embodiment of the invention has a locking device which is effective in two axial sliding positions of the drive shaft for locking the drive shaft against axial displacement euf, whereby in each Verechlebeetstellung elnee the Drive pinion engages with the Stellred assigned to it let · Keeping the coupling described above, you can first select the direction of rotation of the motors determines with which of the setting rudders the drive shaft is to be engaged. Now combs the desired adjusting wheel with the drive shaft, let the locking unit, preferably by electro-magnetic actuation, lock the the drive shaft in its position of engagement with the pinion against further detailed life locked · Now the mirror knows by turning the motor in both directions of rotation accordingly can be set without any transfer of the route in the case of ala dwarf snow peaks, new set waves necessary let · Diee rather allows you to control the waves ice-catching snails or ele spindles.

According to a further embodiment of the invention, it is provided that the locking unit sufwsist an electromagnet with an armature connected to a lever and that the drive shaft carries two spaced annular grooves into which the

101813/0171

gas

Fork with Magnot excitation against the force of a return spring fills. Cebel and ring groove fastened with locking the drive element against exial displacement its unhindered flotation, and the return spring ensures “In aieheree unlocking von Cebel und Antrlebe «« lle waste the magnet, eo that the drive shaft via the coupling unimpeded in both of them End positions veraohoben «know.

A further, advantageous form of execution of the invention is given characterized by the · Botorebtrlebevell «and drive ■ elle non-rotatably, but axially coupled to each other verschiebber and defl the clutch an electromagnotiaeha Bettttigungselnhelt eufveist for exlelcn displacement of the drive shaft.

Due to the constructive ββΒ, "Is the connection between the drive shaft and control unit established by the actuation unit," Is it possible to shift the control shaft driven by the drive shaft into the sine or end by rotating the gate in one or the other direction of rotation? " eehieberiohtung is provoked «Di.ee- permits as a simple execution of a coupling and except for the training:

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BATH ORIGINAL

Excited (raining, let always the drive shaft coupled with an actuator "eo deB by switching the Rotetlon motor in one or the other direction of rotation of the mirror rotated around a swivel axis" to be observed, eoduroh eutOMetleeh the first connection between the drive shaft and the one position is pushed and a connection between the drive shaft and the other position is established with the end position By means of the reverse spring spring again, the geared connection between the designated position and the drive shaft is established.

The CfffifwJuHf "represents a" suppurating tube shape " Drive shaft has an annular groove in which an armature engages almost without a problem. Oedureh becomes a feeta connection between Armature and drive shaft created in exleler direction that a rotation of the drive shaft relative to the existing one xuläflt.

Execution fora of the invention are in the sub- "Prechsn deprived and beechrleben in more detail below"

Invention is based vcm shown in dsr drawing -Unrungebelspislen nachstehenti explained in detail, a £

iiy, ^ i a Draufaictni of a schematically shown Adjustment device with SpiageltrÜgs ??

Fig * 2 is a side view of the adjustment device and mirror support in direction arrow A in Fig. 1,

Fi @. 3 is a top view of a sohematlach shown Adjustment device with mirror frame in accordance with a further exemplary embodiment modified with regard to FIG. 1, and

§01813 / 01 ?!

BATH ORIGINAL

-jar- A / [* 4 ί? 5

Flg. 4 is a plan view of an adjustment device Mirror support soaked in a third version of the nebula.

In Figures 1-4 the same components are with the same Provided with reference numerals, unless they are structurally identical Thus, in Figures 1-4, the mirror carrier is denoted by 1, the * vie in Flg. 2 shows the actual mirror glass, hereinafter referred to as ale mirror 2, holds.

The mirror 1 let in a pivot point 3, which is preferably ale ball joint 4 (Fig. 2) is designed to at least zvel mutually perpendicular pivot axes S and 6 motorized schvenkber. The ball joint 4 let stationary in the not The mirror housing shown is arranged in a hierarchy, as shown in FIG. 2 shown let «

For the motorized adjustment of the mirror carrier 1 about its two pivot axes 5 and 6, the mirror carrier 1 is provided with two Control shafts 7 and θ articulated, their axes at a distance from the pivot point 3 perpendicular to the plane spanned by the pivot axes 5 and 6 and Jeveilo one of the Cross the pivot axes. Thus the axis of the position 7 intersects the The pivot axis S and the axis of the control shaft 8 is the pivot axis 6. The control shafts 7 and 8 are stationary, rotatable stored adjusting wheels 9 and 10 under extreme displacement " The adjusting wheels 9 and 10 run in localized guides 11 and 12, which are shown in Flg. 2 of the clear presentation because of only a hint. Instead of the guided tours the adjusting wheels 9 and 10 can also be held by ball bearings.

• it the adjusting wheels 9 and 10 is a drive shaft 13 by means a clutch 14 vahlvelee in engagement brlngbsr. The drive shaft 13 is connected to a rotary motor 15 with a flange-mounted reduction gear 16. The preferred level is Rotary motor 15 they use an electric geared miniature motor

• 09813/0171

4 1. ? 5 ■

formed and rotatable in two directions of rotation according to arrows a and b in FIGS.

The drive shaft 13 is designed to be axially displaceable. Two Drive pinions 17 and 18 are non-rotatably arranged on the output shaft. Each drive pinion 17, 18 is one of the adjusting wheels 9 and 10, namely the setting wheel 9, the drive pinion 17 and the setting wheel 10, the drive pinion 18. The distance of the two drive pinions 17, 18 from each other on the drive shaft 13 is made such that only one drive pinion 17 or 18 with its associated adjusting wheel 9 or is engaged. In the present embodiments, the drive pinion 17 is designed as a gear and on the free Arranged at the end of the drive shaft 13 and the associated adjusting wheel 9 carries a spur toothing 19. In contrast, the drive pinion 18 is a worm and the associated adjusting wheel 10 is a Worm gear formed.

In the exemplary embodiments in FIGS. 1 or 2 and 3, the coupling 14 has a connection with the output shaft 20 of the micro-transmission motor 15/16 rigidly connected clutch bell 21, in which the Drive shaft 13 can be screwed with axial displacement. The axial displacement movement of the drive shaft 13 is limited by two stationary stops 22 and 23, the stop 22 from the end wall of the clutch bell 21 and the stop 23 are formed by a guide 24 for the drive shaft 13. The clutch bell 21 has an internal thread 25 and the in the clutch bell 21 protruding part of the drive shaft has a corresponding external thread 26. The clutch bell 21 can, however, also be designed as a hollow worm, the part of the drive shaft protruding into the clutch housing 21 13 carries a corresponding worm thread.

In the embodiment according to FIGS. 1 and 2, the control shafts 7 and 8 designed as double-flighted screws, which at are provided with Ufende gangs at each end.

909813/0171

4 1 2 *

The adjusting device according to the embodiment of FIG. 1 and 2 with adjusting shafts designed as two-flight screws works uiie follows

The motor 15 is switched on in such a way that the output shaft If it rotates in the direction of the arrow a, the drive r screws itself Shaft 13 out of the clutch bell housing 21 until the drive shaft 13 comes to rest against the stop 23. Included the external toothing of the drive pinion 17 comes into engagement with the spur toothing 19 of the setting wheel 9. Through the Stop 23 effects the axial displacement of the drive shaft stopped, so that now the drive shaft 13 is synchronized with the clutch bell 21 and thus with the output shaft 20 the motor 15 rotates. The rotary movement of the drive shaft 13 causes a rotation of the adjusting wheel 9, which now has its internal thread on the designed as a two-flight worm Adjusting shaft 7 screwed. As a result, the stall shaft 7 is axially displaced in one direction, and the axial adjustment the adjusting shaft 7 causes the mirror support 1 to pivot about the ball joint 4, as shown in FIG. 2 is shown in phantom. If the adjusting shaft 7 is displaced further, the one arranged at one end arrives UJendegang in the adjusting wheel 9, it moves when maintained the same direction of rotation of the adjusting wheel 9, the adjusting shaft 7 now in the other displacement direction, so that the mirror carrier 1 is pivoted back again from its position shown in phantom in FIG. By rotating the ITIo to rs 15 The mirror carrier 1 can thus be pivoted about its axis 6 in any position in the direction of the arrow a. Is the When the desired position is reached, the motor 15 must be switched off «

To adjust the mirror around axis 5, the motor must rotate in direction of rotation b. The direction of rotation is reversed Via a manually operated switch, not shown, which in the usual design of the motor 15 as DC motor only reversed the polarity of the power connection terminals · Now rotates the output shaft 20 and

Θ09813 / 0171

- yi -Ak- 4 j 25

so that the clutch bell 21 in the direction of arrow b, the drive shaft 13 screws into the clutch bell until it strikes against the end wall of the clutch bell 21 forming the stop 22. As a result, the drive shaft 13 works again axially displaced and the drive pinion 18 comes into engagement with the adjusting wheel 10, as shown in FIG. 1. As a result of the stop 22 cannot move the drive shaft 13 any further axially, it is held by the clutch bell 21 and runs synchronously with it. The rotational movement of the drive pinion arranged in a rotationally fixed manner on the drive shaft 13 18 is converted into a rotary movement of the adjusting wheel 10, which is now in turn on the also as two-flight worm formed adjusting shaft β screwed and thereby displaces it in the axial direction. The mirror carrier 2 is now rotated about the pivot axis 5. At the end of the control shaft, the direction of rotation is reversed again using the U / end gears, see above that by rotating the motor 15 in the direction of the arrow ^ dsr mirror carrier 1 can be brought into any position about its pivot axis 5.

In the design of the setting device according to the embodiment in FIGS. 1 and 2, it is when the desired setting point is passed of the mirror required to pivot the mirror into its end position, in which over the U / end gears the direction is reversed and the mirror is swiveled back into its position. This is often cumbersome and requires a relatively long time if the adjustment device is handled inappropriately.

In order to remedy this deficiency and a faster setting even if the setting point of the is accidentally exceeded To enable mirrors, in the exemplary embodiment according to FIG. 3, a locking unit 27 for locking the drive shaft 13 provided against axial displacement. This locking unit 27 is in two axial sliding positions of the drive shaft 13 effective, with one in every position the drive pinion 17 or 1Θ with the adjusting wheel assigned to it 9 or 10 is engaged. The actuation of the locking unit

909813/0171

27 is preferably done electromagnetically. To this end, the Locking unit 27 has an electromagnet 28, the armature 29 of which is connected to a fork 30 which, at a point 31 is pivotably mounted against the force of a return spring 32 * The drive shaft 13 carries two spaced apart Annular grooves 33 and 34, in which the fork 30 when the magnet 28 is excited against the force of the return spring 32 comes to mind. The drive shaft 13 is thus locked against axial displacement, but it can still be unhindered turn. As soon as the IT magnet excitation is removed, the Return spring 32 the fork 30 out of the annular groove and the drive shaft 13 can again by means of the coupling 14 in the axial Direction can be shifted.

The mode of operation of this mirror adjustment device is the same as that described for FIG. 1. In addition to that, through special insertion of a power button, not shown, for the Mektromagneten 28 this is energized and the drive shaft 13 in an engagement position with one of the adjusting wheels 9 or 10 holds. With a meshing drive pinion 17 and setting wheel 7, their engagement by rotating the motor 15 in the direction of arrow a has been brought about in Fig. 1, the motor can now be switched when the magnet is excited, so that it is in the direction of the arrow b rotates without the drive pinion 17 and setting wheel 9 disengaging. It is thus possible by reversing the direction of rotation of the Iflotor 15 also to reverse the displacement movement of the one actuating shaft 7 immediately, without first over To have to drive the UJendegänge * It is therefore also possible to to dispense with a design of the actuating shaft 7 as a double-flighted worm and only as a single-flighted worm or simple spindle to manufacture. The same naturally also applies to the transmission connection of the drive pinion 18 and setting wheel 10, which are activated by the locking device 27 when the magnet is excited by the fork 30 falling into the annular groove 33 is ensured. As soon as the purple excitement is lifted, the setting device according to FIG. 3 works like that in FIG described.

909813/0171

The adjusting device according to the embodiment in Fig.4 differs from the exemplary embodiments described for FIGS. 1-3 only by a different design of the coupling 14 for selective engagement of the Drive shaft 13 with one of the adjusting wheels 9 or 10. The output source 20 of the miniature gear motor 15/16 and the drive shaft 13 are non-rotatable, but axially displaceable relative to one another coupled, do for example by training the Abtriebsiuelle 20 as a splined shaft and pushing on the drive shaft 13 can be realized on this splined shaft. The clutch 14 also has an electromagnetic one Actuating unit 35 for axially displacing the drive shaft 13. The electromagnetic operating unit 35 has an electromagnet 36, the armature 37 of which in a rotational movement of the drive shaft 13 allowing, but An axial displacement of armature 35 and drive shaft 13 with respect to one another is prevented by means of the drive shaft 13 is coupled. This is done by means of an annular groove 38 into which the armature 35, which is provided with a shoulder or a fork 39, has no play intervenes. When the magnet is de-energized, a return spring 40 holds the armature in an end position in which the drive pinion 17 is in engagement with the setting wheel 9. The armature stroke of the Electromagnet 36 is dimensioned so that when the magnet is energized, the drive shaft 13 is displaced to such an extent that the drive pinion 18 and setting wheel 10 - as shown in FIG. 4 in Engagement with each other.

In this embodiment, the selection of the control shafts 7 or S and thus the selection of the pivoting of the Mirror carrier 1 about its pivot axis 6 or 5 by switching on or not switching on the electric agent 36 while the direction of the axial displacement of the adjusting shaft 7 or by rotating the lilotors 15 in one or the other direction according to the arrows a or b in Fig. 4 is determined. Otherwise the mode of operation of the adjustment device is correct (nBB this embodiment with those described above Execution examples match.

909813/0171

To in the embodiments according to FIGS. 1 and 2 bzu /. 3 at Starting the Iflotor in the direction of rotation according to arrow a and the with it associated axial displacement of the drive shaft 13 from its position shown in Fig. 1 or 3, in which the Drive pinion 18 is in engagement with the adjusting wheel 10, an unwanted one Turning the setting wheel 10 - and with it an iuenn too slight adjustment of the mirror carrier 1 and mirror 2 too prevent is the inhibition of setting wheel 10 and Stelliuelle selected to be greater than the friction between the threads 25 and and drive pinion 18 and setting wheel 10. In the exemplary embodiment According to FIGS. 1 and 2, the setting wheel 10 can also be provided with a reset device instead, since the setting wheel 10 only rotates in one direction of rotation when adjusting the mirror.

For an additional manual adjustment in addition to the motorized adjustment of the rearview mirror, the geared connection be designed to be resilient between the adjusting wheel and adjusting shaft or the pitch of the two-start counter-rotating worm as well be chosen so that the mirror adjustment is also possible by hand.

The application of the adjustment device according to the invention is Of course, not limited to rearview mirrors in motor vehicles, but can be used wherever a Body is to be pivoted in a pivot point about at least two Schtuenkachsen perpendicular to each other. The use of the adjustment device in rearview mirrors of motor vehicles is considered to be preferred, since this can achieve considerable advantages over the known prior art.

909813/0171

Claims (13)

<I 2 5 "' Robart Bosch GmbH August 22, 1977 Stuttgart Claim Device for sichtgerschten setting backsight ^ - reflect for vehicles, particularly motor vehicles, with a mirror-holding Mirror support in a pivot point by at least two perpendicular Swiveling axes that are positioned on top of one another can be swiveled by a motor is characterized in that with the mirror carrier (i) at least two adjusting shafts (7, 8) are articulated, the axes of which are at a distance of the Schuienkpunkt (3) perpendicular to that of the pivot axes (5, 6) extend spanned plane and each cross one of the pivot axes that the control shafts each in stationary, rotatably mounted adjusting wheels (9, 10) can be screwed with axial displacement and that one with a reversible rotary motor (15, 16) connected drive shaft (13) and a coupling (14) for optionally engaging the drive shaft with a the adjusting wheels is provided. 2. Device according to claim 1, characterized in that that the drive shaft (13) is designed to be axially displaceable and that there are two on the drive shaft Drive pinions (17, 18) connected to one of the adjusting wheels (9, 10) in a rotationally fixed manner and at a distance from one another are arranged such that in each case only one drive pinion meshes with the adjusting wheel assigned to it is. 909813/0171 - 2 - 4 12 5 ' 3. Device according to claim 2, characterized in that that one of the drive pinions (18) as a worm and the associated adjusting wheel (10) as a worm wheel is trained· 4 «A device according to claim 2 or 3, characterized in ¹ that one of the drive pinion is formed (17) ale gear and disposed on the free end of the drive shaft (13) and that the associated wheel (9) carries a spur gear toothing (19). 5. Device according to one of claims 2-4, characterized characterized in that the clutch (I4) one with the Has the output shaft (20) of the rotary motor (15, 16) non-rotatably connected clutch bell (21) in which the Drive shaft (I3) can be screwed with axial displacement. and that two stationary stops (22, 23) are provided to limit the axial displacement movement of the drive shaft are. 6. Apparatus according to claim 5, characterized in that that the coupling glasses (21) have an internal thread (25) and that protruding into the coupling bell Part of the drive shaft (13) has a corresponding external thread (26). 7. Apparatus according to claim 5 or 6, characterized in that that the adjusting shafts (7, 8) are designed as two-flight screws at each end are provided with U / end gears. 8. Device according to one of claims 5-7, characterized by a locking unit effective in two axial displacement positions of the drive shaft (13) (27) for locking the drive shaft (13) against axial displacement, with the drive shaft in both displacement positions one of the drive pinions (17, 18) is in engagement with the adjusting wheel (9, 10) assigned to it. 909813/0171 - 3 - 4 12 5 ' 9. Apparatus according to claim 8, characterized by an electromagnetic actuator for the locking unit (27). 10. l / device according to claim 9, characterized in that that the locking unit (27) has an electromagnet (28) connected to a fork (30) Has armature (29) and that the drive shaft (13) has two spaced annular grooves (33,34) carries into which the fork in the case of IT magnet excitation against the force of a Return spring (32) falls. 11. Device according to one of claims 2-4, characterized characterized in that the output shaft (20) of the rotary motor (15, 15) and the drive shaft (13) rotatably, but axially displaceable relative to one another and that the clutch (14) has an electromagnetic actuating unit (35) for axially displacing the drive shaft having. 12. The device according to claim 11, characterized in that that the electromagnetic actuating unit (35) has an electromagnet (36) whose armature (37,39) in a rotational movement of the drive shaft (13) allowing an axial displacement of the armature and Drive shaft against each other preventing Ul ei se with the Drive shaft is coupled, and a return spring holding the armature when the magnet is de-energized in an end position (40) has that the arrangement of armature and drive shaft is made so that when the magnet is de-energized the one pinion (17) with the one adjusting wheel (9) is in engagement and that the armature stroke is dimensioned so that when energized magnets the other drive pinion (18) is in engagement with the other adjusting wheel (10). 13..A device according to claim 12, characterized in that that the drive shaft (13) has an annular groove (38), in which the armature (37, 39) engages with almost no play. 909813/0171