EP3591122A1 - Quick changer - Google Patents

Abstract

The invention relates to a quick coupler (1) for changing an attachment on a construction machine, which has a carrier (7), first receptacles (8) arranged on one side of the carrier (7) for receiving a first coupling element (5), on the other side of the carrier (7) arranged second receptacles (9) with at least one locking element (10) which can be moved between a release position for coupling or uncoupling the attachment and a coupling position for holding the attachment on the quick coupler (1), and for receiving a second coupling element (6) includes a mechanical display device (16) for checking the locking. In order to enable an improved locking control, the mechanical display device (16) has a device (17, 19, 22, 23) for displaying a lack of engagement of the second coupling element (5) on the second receptacles (9).

Description

The invention relates to a quick changer according to the preamble of claim 1. The invention also relates to a quick change system with such a quick changer and an associated adapter.

Such quick couplers are used to easily and conveniently change different attachments on construction machines. With such a quick coupler, e.g. Swivel buckets, grabs, scissors, compressors, magnets, hydraulic hammers or other attachments in a few seconds and with a high level of safety from a driver's cab e.g. be coupled or uncoupled to a boom of an excavator.

From the US 6 379 075 B1 a generic quick coupler is known. This contains a carrier which has on one side first receptacles for holding a first coupling element provided on an attachment and on the other side has second receptacles with a locking element movable between a release position and a locking position for releasably holding a second coupling element. The locking element is designed as a linearly movable hook slide that can be moved between an open and a closed position. An indicator rod is attached to the hook slide, which is drawn into a housing in the closed position of the hook slide and protrudes relative to the housing in the open position of the hook slide. Although the position of the hook slide can be checked by such a display device, it cannot be checked by the display device whether the coupling element on the hook slide has engaged correctly.

The object of the invention is to provide a quick changer of the type mentioned and a quick change system with such a quick changer, which enable improved control of a correct locking.

This object is achieved by a quick changer with the features of claim 1 and by a quick change system with the features of claim 14. expedient Refinements and advantageous developments of the invention are specified in the subclaims.

In the quick coupler according to the invention, the mechanical display device has a device for indicating a lack of engagement of the second coupling element on the second receptacles. Correct locking is therefore only indicated if the second coupling element is also in its position provided for correct locking. For the monitoring and display of a correct locking, not only the position of the at least one locking element, but also the position of the second coupling element is included. This can improve control and increase security.

In a particularly advantageous embodiment, the device for indicating the lack of engagement of the second coupling element on the second receptacles can be a display element movable between a locking position and an unlocking position and a coupling gear for moving the display element into the locking position when the at least one locking element moves into the coupling position and for moving the display element backwards into the unlocking position when the at least one locking element moves beyond the coupling position.

The coupling gear expediently contains a control lever which can be pivoted on the support about an articulation and which is connected to the display element via an articulated rod and a linearly movable rod. The control lever preferably has a control cam and a recess. The linearly movable rod is expediently guided in a guide and resiliently biased.

The control lever can be rotated by a cylinder for displacing the at least one locking element via an actuating device. In a low-friction version, the actuating device can be a lever with a ball bearing.

In a configuration which is particularly easy to recognize for the operator, the display element can be a flap which is pivotably arranged on a housing and which can be moved between a raised locking position and a lowered position via a linearly displaceable rod Unlocking position is movable. However, the display element can also be a bolt movable between an in and out position or another suitable display element.

In a further embodiment, the coupling gear can contain a slide which can be displaced at right angles to the display element and connected to it via a toothed drive, and an actuating element which is detachably connected to the slide. The carriage can e.g. be releasably connected to the actuating element via a pivotable control lever. The toothed drive can comprise a lever which can be rotated by a gearwheel, an idler gear meshing with the gearwheel and a toothed rack meshing with the idler gear on the slide.

The invention also relates to a quick-change system with a quick-changer described above and an adapter that can be coupled to the quick-changer.

Figur 1

eine zum Teil geschnittene Seitenansicht eines Schnellwechselsystems mit einem Schnellwechsler und einem Adapter in einer Kupplungsstellung;

Figur 2

eine Perspektivansicht des Schnellwechslers von Figur 1 in einer Wechselstellung;

Figur 3

eine vergrößerte Detailansicht A von Figur 2;

Figur 4

eine vergrößerte Detailansicht B von Figur 3;

Figur 5

eine zum Teil geschnittene Seitenansicht des Schnellwechselsystems von Figur 1 in einer Wechselstellung;

Figur 6

den Schnellwechsler in der Wechselstellung von Figur 5;

Figur 7

eine zum Teil geschnittene Seitenansicht des Schnellwechselsystems von Figur 1 in einer Kupplungsstellung;

Figur 8

den Schnellwechsler in der Kupplungsstellung von Figur 7;

Figur 9

eine zum Teil geschnittene Seitenansicht des Schnellwechselsystems von Figur 1 in einer nicht verriegelten ersten Stellung;

Figur 10

den Schnellwechsler in der Stellung von Figur 9;

Figur 11

eine zum Teil geschnittene Seitenansicht des Schnellwechselsystems von Figur 1 in einer nicht verriegelten zweiten Stellung;

Figur 12

den Schnellwechsler in der Stellung von Figur 11;

Figur 13

ein zweites Ausführungsbeispiel eines Schnellwechselsystems in einer Kupplungsstellung;

Figur 14

eine Anzeigevorrichtung des Schnellwechselsystems von Figur 13 in der Kupplungsstellung;

Figur 15

das Schnellwechselsystem von Figur 13 in einer verriegelten Stellung;

Figur 16

die Anzeigevorrichtung des Schnellwechselsystems von Figur 13 in der verriegelten Stellung;

Figur 17

das Schnellwechselsystem von Figur 13 in einer nicht verriegelten Stellung und

Figur 18

die Anzeigevorrichtung des Schnellwechselsystems von Figur 13 in der nicht verriegelten Stellung.

Further special features and advantages of the invention result from the following description of a preferred exemplary embodiment with reference to the drawing. Show it:

Figure 1

a partially sectioned side view of a quick change system with a quick changer and an adapter in a coupling position;

Figure 2

a perspective view of the quick coupler from Figure 1 in a changing position;

Figure 3

an enlarged detail view A of Figure 2 ;

Figure 4

an enlarged detail view B of Figure 3 ;

Figure 5

a partially sectioned side view of the quick change system from Figure 1 in a changing position;

Figure 6

the quick coupler in the change position from Figure 5 ;

Figure 7

a partially sectioned side view of the quick change system from Figure 1 in a clutch position;

Figure 8

the quick coupler in the coupling position of Figure 7 ;

Figure 9

a partially sectioned side view of the quick change system from Figure 1 in an unlocked first position;

Figure 10

the quick coupler in the position of Figure 9 ;

Figure 11

a partially sectioned side view of the quick change system from Figure 1 in an unlocked second position;

Figure 12

the quick coupler in the position of Figure 11 ;

Figure 13

a second embodiment of a quick change system in a clutch position;

Figure 14

a display device of the quick change system from Figure 13 in the clutch position;

Figure 15

the quick change system from Figure 13 in a locked position;

Figure 16

the display device of the quick change system from Figure 13 in the locked position;

Figure 17

the quick change system from Figure 13 in an unlocked position and

Figure 18

the display device of the quick change system from Figure 13 in the unlocked position.

In Figure 1 shows a quick-change system consisting of a quick changer 1 and an associated adapter 2 for simple and convenient changing of different attachments on construction machines, in particular excavators. With such a Quick couplers, for example, swivel buckets, grapples, scissors, magnets, compressors, hydraulic hammers or other mechanical or hydraulic attachments can be easily and conveniently connected or disconnected from a driver's cab to a boom or other attachment part of an excavator or other construction vehicle.

The adapter 2, which can be fastened to an attachment, contains a base plate 3 and two mutually parallel side cheeks 4, between which a first bolt-shaped coupling element 5 and a second bolt-shaped coupling element 6 spaced apart from it at a predetermined distance are arranged for releasable connection to the quick coupler 1. The two bolt-shaped coupling elements 5 and 6 can be inserted into corresponding bores in the side cheeks 4 and fixed there.

The one in Figure 2 Quick changer 1 shown in perspective contains a support 7 designed as a welded or cast part, the first receptacles 8 open on one side for receiving and holding the first bolt-shaped coupling element 5 and on the other side open second receptacles 9 with an in Figure 1 Locking element 10 shown for receiving and holding the second bolt-shaped coupling element 6.

In the exemplary embodiment shown, the quick coupler 1 contains on one side of the carrier 7 two spaced-apart receptacles 8 for the first coupling element 5 and on the other side two receptacles 9 for the second coupling element 6. The first receptacles 8 open towards the front are clawed or fork-shaped. The second receptacles 9, which are open at the bottom, have a curved lower contact surface 11 for the contact of the second bolt-shaped coupling element 6. The carrier 9 contains on its upper side two mutually parallel side parts 12, in which through openings 13 are provided for fastening bolts, not shown, for fastening the quick coupler 1 to a boom of an excavator or a connecting part of another construction vehicle.

In the embodiment shown, the quick coupler 1 also contains two locking elements 10 designed as locking bolts, which according to FIG Figure 1 Slidably guided in guide bores 14 of the carrier 7 and together hydraulically by a cylinder 15 which is H-shaped in plan view between an in Figure 5 Retracted release position shown for releasing or coupling an attachment and a in Figure 7 locking position shown are movable. In the locked position of Figure 7 the downwardly open second receptacles 9 are closed on the underside by the locking elements 10 arranged in the guide bores 14, so that the second bolt-shaped coupling element 6 is gripped by the locking elements 10.

In order to couple an attachment with the aid of the quick coupler 1, the quick coupler 1, which is generally arranged on a boom of an excavator, is first moved so that a e.g. first coupling element 5 arranged on an adapter or on the attachment is inserted into the claw-shaped or fork-shaped receptacles 8 on one side of the quick coupler 1. Then the quick coupler 1 with the locking elements 10 still retracted is pivoted about the first bolt-shaped coupling element 5 in such a way that the second coupling element 6 on the adapter or attachment comes into contact with the contact surfaces 11 of the receptacles 9 which are open at the bottom on the other side of the quick coupler 1. Subsequently, the locking elements 10 which are displaceably arranged in the guide bores 14 in the carrier 7 of the quick changer 1 can be extended hydraulically, so that the second bolt-shaped coupling element 6 is gripped by the two locking elements 10 on the quick changer 1 and the attachment is thus held on the quick changer 1.

A mechanical display device 16 for checking correct locking is also provided on the quick coupler 1. How special from the Figures 3 and 4 shows, the mechanical display device 16 has a device for signaling a lack of engagement of the second coupling element 6 on the second receptacles 9. The device for signaling a lack of engagement of the second coupling element 6 on the second receptacles 9 contains a display element 17 movable between a locking position and an unlocking position and a coupling gear, by means of which the display element 17 first moves into the locking position when the locking elements 10 move into the coupling position becomes. However, if the locking elements 10 move beyond the coupling position due to an improperly engaging coupling element 5, the display element 17 is moved back into the unlocking position via the coupling gear. This can signal to the operator that, despite the actuation of the locking elements 10, no proper locking has taken place.

In the exemplary embodiment shown, the display element 17 is a flap which is pivotably arranged on a housing 18 and which is moved by a linearly displaceable rod 19 via a pin 20 guided inside the housing 18 between a flap Figure 1 shown raised locking position and one in Figure 5 shown lowered unlocking position is movable. At the in Figure 1 locking position shown protrudes the bolt 20 relative to the housing 19 and lifts the flap-shaped display element 17. In the unlocked position, however, the bolt 20 is drawn into the housing 18 and the flap-shaped display element 17 is closed. As a result, it can be seen from the outside visually, and in particular from a driver's cab, whether the quick coupler 1 is properly locked. The display of the locking and unlocking position can also be done only by the bolt 20 without a flap.

How special Figure 3 is apparent, the coupling gear designed for the connection between the cylinder 15 and the display element 17 contains a control lever 22 which is arranged on the support 7 so as to be pivotable about a joint 21 and which is connected to the linearly movable rod 19 via a joint rod 23. The control lever 22, which can be pivoted about the joint 21, has a control cam 24 and a depression 25 on one arm. On the other arm of the control lever 22, one end of the joint rod 23 is articulated. The other end of the articulated rod 23 is articulated to the linearly movable rod 19 for moving the display element 17. The linearly movable rod 19 is guided displaceably via a guide 26 fastened to the cylinder 15 and is inserted into the spring by a spring arranged inside a bushing 27 Figure 3 shown unlocked position pressed. The guide 26 is designed in the embodiment shown as a double angled sheet metal part. By rotating the plate-shaped control lever 22, the rod 19 is moved linearly via the articulated rod 23. The control lever 22 is rotated by the cylinder 15 provided for displacing the two locking elements 10 via a lever 28 with a ball bearing 29 arranged thereon. The ball bearing 29 is designed to engage the control cam 24 and the recess 25 of the control lever 22.

The mode of operation of the display device 16 described above is described below with reference to FIG Figures 5 to 12 explained.

At the in Figures 5 and 6 shown change position, the two locking elements 10 are in a retracted release position. In this position it is Ball bearing 29 according to Figure 6 spaced from the control cam 24 of the control lever 22 and the control lever 22 is pressed by the spring-loaded rod 19 via the articulated rod 23 into the starting position shown. The rod 19 is in a retracted position, as a result of which the flap-shaped display element 17 is in a downward unlocked position. This signals to the operator that the quick coupler 1 is in a change position. In the in Figure 5 Change position shown with retracted locking elements 10, the quick coupler 1 can be lowered on the front side, so that the second coupling element 6 comes to rest on the lower contact surface 11 of the receptacles 9.

If the second coupling element 6 according to Figure 7 comes to rest on the lower contact surface 11 of the receptacles 9, the two bolt-shaped locking elements 10, which have at their front ends a curve 30 adapted to the outer contour of the coupling element 6 for bearing on the outside of the bolt-shaped coupling element 6, through the common cylinder 15 be extended and into the in Figure 7 shown coupling position. In this coupling position, the coupling element 6 is gripped by the two bolt-shaped locking elements 10 and the adapter 2 is securely locked on the quick coupler 1.

When the adapter 2 is correctly engaged, the two locking elements 10 are moved by the cylinder 15 from their retracted release position into the in Figure 7 shown clutch position moves, the lever 28 attached to the cylinder 28 moves with the ball bearing 29 according to Figure 8 on the control cam 24 of the control lever 22, so that the control lever 22 is rotated about the joint 21 and the flap-shaped display element 17 is moved via the articulated lever 23 and the linearly movable rod 19 into the raised locking position. In the locked position of Figure 8 the bolt 20 projects from the housing 18 and the flap-shaped display element 17 is raised. This signals to the operator that the adapter 2 is properly coupled and locked on the quick coupler 1. The coupling gear is designed such that the ball bearing 29 at the in Figure 8 locking position shown comes to rest on the outermost edge of the control cam 24 at the transition to the recess 25.

If the bolt-shaped locking elements 10 according to Figure 9 due to a lack of engagement of the coupling element 6 on the receptacles 9 via the in Figure 8 shown If the clutch position is moved out and extended further until the cylinder 15 stops on an edge 31 of the carrier 7, the ball bearing 29 arrives in accordance with FIG Figure 10 beyond the outermost edge of the control cam 24 and engages in the recess 25 of the control lever 22, as a result of which the control lever 22 acted upon by the spring-loaded rod 19 via the articulated rod 23 returns to the starting position. The bolt 20 at the front end of the rod 19 is also drawn back into the housing 18 and the flap-shaped display element 17 is moved into the lowered unlocking position. This is a signal for the operator that the adapter 2 on the quick coupler 1 is not properly locked despite the extended locking elements 10.

Also one in Figure 11 shown position with improper engagement of the coupling element 6 is displayed. If an extension of the two locking elements 10 is blocked by the coupling element 6, which does not engage correctly, the ball bearing 29 also remains in accordance with FIG Figure 12 spaced from the control cam 24 of the control lever 22 and the control lever 22 is pressed by the spring-loaded rod 19 via the articulated rod 23 into the starting position shown. The bolt 20 at the front end of the rod 19 is in a position retracted into the housing 18 and the flap-shaped display element 17 is in the lowered unlocking position. This indicates to the operator that the quick coupler 1 is not locked correctly.

In the Figures 13 to 18 A further exemplary embodiment of a quick-change system with a quick-changer 1 and an associated adapter 2 is shown. In this embodiment, too, a mechanical display device 16 is provided on the quick coupler 1 for checking that it is properly locked. The mechanical display device 16 used in this embodiment contains a display element 17 which is designed here as a bolt and which is arranged displaceably within a housing 18 between a locking position and an unlocking position. In the in Figure 16 In the locking position shown, the bolt-shaped locking element 17 protrudes laterally in relation to the housing 18, whereas the locking element 17 in one in the Figures 14 and 18 Unlocked position shown is drawn into the housing 18. When the locking elements 10 move into the release or coupling position, the display element 17 is also first moved into the locking position in this embodiment via a coupling gear. If, however, the locking elements 10 move due to an improperly engaging coupling element 5 via the coupling position move out, the display element 17 is moved back here via the coupling gear back into the unlocked position. This can signal to the operator that, despite the actuation of the locking elements 10, no proper locking has taken place.

Like from the Figures 14 and 16 As can be seen, the pin-shaped display element 17, which is displaceably guided within the housing 18, can be moved by a lever 33 which is arranged within the housing 18 so as to be pivotable about an axis of rotation 32. For this purpose, the lever 33, which can be pivoted about the axis of rotation 32, is articulated with its lever arm 34 via a cross pin 35 to the bolt-shaped display element 17. The rotation of the lever 33 takes place via a gearwheel 36 which is firmly connected to the latter and which engages via an intermediate gear 37 with a toothed rack 38 on a slide 39 which can be displaced within the housing 18 at right angles to the display element 17. By moving the carriage 39, the display element 17 is thus between the in Figure 14 shown retracted position and in Figure 16 shown extended position slidable. The carriage 39 is acted upon by a spring arrangement, not shown here, such that the display element 17 is drawn into the housing 18 under the force of the spring arrangement,

A rod-shaped actuating element 40 protruding from the housing 18 and arranged at right angles to the display element 17 is displaceably guided in the slide 39. A two-armed control lever 42 which can be pivoted about an axis 41 is also arranged on the slide 39. The slide 39 is detachably connected to the rod-shaped actuating element 40 via the control lever 42 which can be rotated about the axis 41. For this purpose, the control lever 42 has on its one lever arm a nose 43 for engaging in a groove 44 of the actuating element 40 and on its other end a control bevel 45 for engaging an oblique control surface 46 on the housing 18. The control lever 42 is acted upon by a spring (not shown here) in such a way that the nose 43 is pressed in the direction of the actuating rod 40. The actuating rod 40 is connected to the cylinder 15 via a linkage 47 and a holder 48.

In the in the Figures 13 to 18 shown embodiment, the display device 16 works as follows: In the in the Figures 13 and 14 Change position shown, the cylinder 15 takes the in Figure 13 shown position and the locking elements 10 are in a retracted release position. The rod-shaped actuating element 40, which is connected to the cylinder 15 via a linkage 47 and a holder 48, and the slide 39 coupled to the latter via the control lever 42 are located in one in Figure 14 shown starting position. In this initial position of the slide 39, the display element 17 connected to the slide 39 via the rack 38, the intermediate gear 37, the gear 36 and the lever 33 is drawn into the housing 18. This signals to the operator that the quick coupler 1 is in a change position. In this change position, the quick coupler 1 can be coupled at its rear end to the first coupling element 5 of the adapter 2 via the first receptacles 8 and then lowered on the front side, so that the second coupling element 6 can be placed against the lower contact surface 11 of the receptacles 9 arrives.

Then the cylinder 15 according to Figure 15 displaced in the direction of the second coupling element 6 and the locking elements 10 thereby moved properly couple into the adapter 2, the slide 39 is moved out of the position shown in FIG Figure 14 shown starting position in a in Figure 16 shown locking position shifted. In the in Figure 16 shown locking position of the slide 39, the control lever 42 is in its not yet pivoted coupling position. By moving the carriage into the locking position, the display element 17 is moved via the rack 38, the intermediate gear 37, the gear 36 and the lever 33 into a locking position protruding from the housing 18. This signals to the operator that the adapter 2 is properly coupled and locked on the quick coupler 1.

If the bolt-shaped locking elements 10 according to Figure 9 due to a lack of engagement of the coupling element 6 on the receptacles 9 via the in Figure 8 If the coupling position shown is moved out and extended further until the cylinder 15 stops on an edge 31 of the carrier 7, the slide 39 is also moved further in the direction of the oblique control surface 46 on the housing 18. The control lever 42 is pivoted so that the nose 43 disengages from the groove 44 on the actuating element 40 and there is no more locking between the slide 39 and the actuating element 40 via the control bevel 45. The spring arrangement then becomes resilient in the direction of the starting position prestressed slide 39 pressed into its starting position, the display element 17 being retracted into the housing 18. This is a signal for the operator that the adapter 2 on the quick coupler 1 is not properly locked despite the extended locking elements 10. When the quick coupler 1 is opened, the cylinder 15 moves back again and the latching between the resiliently pretensioned control lever 32 and the actuating element 40 is reactivated to connect the carriage 39 and the actuating element 40. The mechanics are then ready for the next actuation of the quick coupler.

LIST OF REFERENCE NUMBERS

1

Quick coupler

2

adapter

3

baseplate

4

side cheek

5

First coupling element

6

Second coupling element

7

carrier

8th

First shot

9

Second shot

10

locking element

11

contact surface

12

side panel

13

opening

14

guide bore

15

cylinder

16

display device

17

display element

18

casing

19

pole

20

bolt

21

joint

22

control lever

23

joint rod

24

cam

25

deepening

26

guide

27

Rifle

28

lever

29

ball-bearing

30

curve

31

edge

32

axis of rotation

33

lever

34

lever arm

35

cross pin

36

gear

37

idler

38

rack

39

carriage

40

actuator

41

axis

42

control lever

43

nose

44

groove

45

control slope

46

control surface

47

linkage

48

bracket

Claims (14)

Quick coupler (1) for changing an attachment on a construction machine, the carrier (7), first receptacles (8) arranged on one side of the carrier (7) for receiving a first coupling element (5), on the other side of the carrier (7 ) arranged second receptacles (9) with at least one locking element (10) movable between a release position for coupling or uncoupling the attachment and a coupling position for holding the attachment on the quick coupler (1) for receiving a second coupling element (6) and a mechanical display device ( 16) for checking the locking, characterized in that the mechanical display device (16) has a device (17, 19, 22, 23, 39, 40) for indicating a lack of engagement of the second coupling element (5) on the second receptacles (9 ) includes. Quick coupler (1) according to claim 1, characterized in that the device (17, 19, 22, 23, 39, 40) for indicating a lack of engagement of the second coupling element (6) on the second receptacles (9) between a locking position and an unlocking position movable display element (17) and a coupling gear (19, 22, 23; 39, 40) for moving the display element (17) into the locking position upon movement of the at least one locking element (10) into the coupling position and for backward movement of the display element ( 17) into the unlocking position when the at least one locking element (10) moves beyond the coupling position. Quick coupler (1) according to claim 2, characterized in that the coupling gear (19, 22, 23) contains a control lever (22) which can be pivoted on the carrier (7) about a joint (21) and which has a linear rod and a linear rod movable rod (19) is connected to the display element (17). Quick coupler (1) according to claim 3, characterized in that the control lever (22) has a control cam (24) and a recess (25). Quick coupler (1) according to claim 4, characterized in that the control cam (24) and the recess (25) on one arm of the control lever (22) and the articulated rod (23) are arranged on the other arm of the control lever (23). Quick coupler (1) according to one of claims 3 to 5, characterized in that the control lever (22) is rotatable by a cylinder (15) for displacing the at least one locking element (10) via an actuating device (28, 29). Quick coupler (1) according to claim 6, characterized in that the actuating device (28, 29) is formed by a lever (28) with a ball bearing (29). Quick coupler (1) according to one of claims 3 to 7, characterized in that the linearly movable rod (19) is guided displaceably in a guide (26) and is spring-loaded. Quick coupler (1) according to one of claims 3 to 8, characterized in that the display element (17) is a flap which is pivotally arranged on a housing (18) and can be moved via a linearly movable rod (19) between a raised locking position and a lowered unlocking position is. Quick coupler according to Claim 2, characterized in that the coupling gear (39, 40) has a slide (39) which can be displaced at right angles to the display element (17) and is connected to it via a toothed drive (36, 37, 38) and a slide (39) contains detachably connected actuating element (40). Quick coupler according to claim 10, characterized in that the carriage (39) is detachably connected to the actuating element (40) via a pivotable control lever (42). Quick coupler according to claim 11, characterized in that the two-armed control lever (42) which is arranged on the carriage (39) so as to be rotatable about an axis (41) has a lug (43) on its one lever arm for engaging in a groove (44) of the actuating element (40 ) and on its other lever arm contains a control bevel (45) for engagement with an oblique control surface (46) on a housing (18). Quick coupler according to one of claims 10 to 12, characterized in that the toothed drive (36, 37, 38) has a lever (33) rotatable by a toothed wheel (36), an intermediate wheel (37) meshing with the toothed wheel (36) and one with contains the rack meshing gear (38) on the slide (39). Quick-change system with a quick-changer (1) and an adapter (2) which can be coupled to the quick-changer (1), characterized in that the quick-changer (1) is designed according to one of Claims 1 to 13.

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