Drive for an adjusting instrument, in particular for adjusting an exterior vision unit of a motor vehicle

1. A drive for an adjusting instrument, comprising a single motor and a driving shaft coupled therewith, wherein the driving shaft cooperates via a transmission selectively with a first and a second driving path respectively, furthermore comprising an operating mechanism with which the transmission is switchable between the first and the second driving path, wherein the operating mechanism is energized by the motor via the driving shaft, and wherein the operating mechanism is configured, upon successive energization of the motor from standstill of the drive, to select alternately the first and the second driving path as initial driving path.

2. The drive according to claim 1 , wherein the operating mechanism forms a mechanical flip-flop, with which upon successive energizations of the motor from rest of the drive, alternately the first and the second driving path is selected the initial driving path.

3. The drive according to claim 1 , wherein the operating mechanism is configured to switch upon successive energization of the driving shaft by the motor in any direction of rotation.

4. The drive according to claim 1 , wherein the operating mechanism is configured to switch upon successive energization of the driving shaft by the motor in the same direction of rotation.

5. The drive according to claim 1 , wherein the transmission comprises an adjustable transmission element which is adjustable in order to have the driving shaft cooperate selectively with the first and the second driving path.

6. The drive according to claim 5 , wherein the adjustable transmission element is adjustable in a longitudinal direction of the driving shaft.

7. The drive according to claim 1 , wherein the operating mechanism comprises a pulse generator with which an adjustable transmission element of the transmission is adjustable.

8. The drive according to claim 7 , wherein the adjustable transmission element, by energization of the motor via the operating mechanism, the pulse generator thereof, is adjustable towards a first position and second position of the adjustable transmission element corresponding to the first driving path and the second driving path respectively.

9. The drive according to claim 8 , wherein the adjustable transmission element is spring-biased away from the first and the second position.

10. The drive according to claim 9 , wherein the adjustable transmission element is spring-biased towards or into a neutral position.

11. The drive according to claim 9 , wherein the adjustable transmission element is spring-biased in a longitudinal direction of the driving shaft.

12. The drive according to claim 8 , wherein the operating mechanism for the adjustable transmission element comprises a set of stops corresponding to the first position and the second position.

13. The drive according to claim 12 , wherein the adjustable transmission element is configured to reciprocate, upon energization of the motor, move forth towards one of the stops, and, upon removal of the energization of the motor, under spring action, move back to a neutral position.

14. The drive according to claim 12 , wherein the operating mechanism comprises an indexer for indexing the stops.

15. The drive according to claim 14 , wherein the indexer is configured to index the stops in an endless cycle with reciprocating movement of the adjustable transmission element.

16. The drive according to claim 7 , wherein the pulse generator comprises a rotation-translation converter.

17. The drive according to claim 16 , wherein the rotation-translation converter comprises a sliding face included in the driving shaft, which extends obliquely with respect to a longitudinal axis of the driving shaft.

18. The drive according to claim 16 , wherein the rotation-translation converter comprises two sliding faces, which extend obliquely with respect to a longitudinal axis of the driving shaft, and which diverge from a longitudinal median plane of the driving shaft, forming a V.

19. The drive according to claim 1 , wherein the switchable transmission is provided with an adjustable transmission element which is adjustable between a first position and a second position, wherein upon rotation of the driving shaft in a positive direction of rotation, the adjustable transmission element in the first position via a positive first driving path drives a first output shaft, and in the second position via a positive second driving path drives the first output shaft in reversed direction of rotation, and wherein upon rotation of the driving shaft in a negative direction of rotation, the adjustable transmission element in the first position via a negative first driving path drives a second output shaft, and in the second position via a negative second driving path drives the second output shaft in reversed direction of rotation.

20. The drive according to claim 19 , wherein the first output shaft is arranged to adjust a carrier for an exterior vision unit of a motor vehicle about a first pivoting axis, and wherein the second output shaft is arranged to adjust the carrier about a second pivoting axis.

21. The drive according to claim 19 , wherein the adjustable transmission element is arranged to drive, per position and per direction of rotation, via one driving path only.

22. An adjusting instrument, comprising the drive according to claim 1 , and a carrier disposed in a manner pivotable about at least a first pivoting axis, wherein a first output shaft is arranged to adjust the carrier about the first pivoting axis.

23. The adjusting instrument according to claim 22 , wherein the carrier is furthermore disposed in a manner pivotable about a second pivoting axis, and wherein a second output shaft is arranged to adjust the carrier about the second pivoting axis.

24. The adjusting instrument according to claim 23 , wherein the carrier comprises a housing of an exterior vision unit.

25. The adjusting instrument according to claim 24 , wherein the housing of the exterior vision unit is a mirror cap.

26. An adjusting instrument according to claim 22 , wherein the carrier is arranged for carrying an exterior vision unit of a motor vehicle.

27. The adjusting instrument according to claim 26 , furthermore comprising a control, connected via electrical wiring with the motor of the drive, which comprises only two buttons, a first button with which via the wiring electrical current for the motor of the drive can be supplied to the motor in a first current direction, and a second button with which the electrical current for the motor can be supplied via the wiring to the motor in a second, reversed current direction.

28. The adjusting instrument according to claim 23 , wherein the second pivoting axis extends substantially transversely to the first pivoting axis.

29. The drive according to claim 1 , furthermore comprising a control, connected via electrical wiring with the motor of the drive, which comprises only two buttons, a first button with which via the wiring electrical current for the motor of the drive can be supplied to the motor in a first current direction, and a second button with which the electrical current for the motor can be supplied via the wiring to the motor in a second, reversed current direction.

30. The drive according to claim 1 , wherein the single motor is an electric motor.

31. A method for driving an adjusting instrument with a drive, the drive comprising a single motor and a driving shaft coupled therewith, in which the driving shaft selectively cooperates via a transmission with a first and a second driving path, respectively; and an operating mechanism with which the transmission is switchable between the first and the second driving path, wherein the operating mechanism is energized by the motor via the driving shaft, and the method comprises switching the operating mechanism between the first and the second driving path as initial driving path upon successive energization of the motor from standstill of the drive.