DE102010017179A1 - Coupling part for mounting on attachment, such as dredger bucket or clamshell, has coupling elements, which are spaced from each other, where third coupling element and two pairs of through holes are provided - Google Patents

Abstract

The coupling part (11) has two coupling elements, which are spaced from each other. A third coupling element and two pairs of through holes (19a,19b,21a,21b) are provided, which serve as pairs of through holes for receiving the third coupling element. The through holes are aligned with each other. A spacer is provided at one of the coupling elements to define another distance that is smaller than the former distance.

Description

Field of the invention

The invention relates to a coupling part for fixing to an attachment according to the preamble of claim 1 and an attachment according to claim 24.

State of the art

Excavators are usually used for very different jobs. There is a need for the tools articulated on the excavator boom, such as, for example, excavator buckets, grippers, hydraulic hammers, demolition tongs, etc., to be able to be changed quickly to carry out various tasks.

For rapid replacement of the aforementioned tools therefore often quick change devices are used in practice, which allow coupling of the tools to the excavator boom from the driver's cab. These quick-change devices can be integrated directly into the excavator boom or into a separate tool adapter.

An excavator boom has a pivotable excavator handle on which a likewise pivotable connecting lever or shuttle is arranged. Both the front end of the excavator handle and the front end of the connecting lever are pivotally connected to a first excavator-side coupling part. This has two holding elements, usually two spaced claw pairs. One of the pairs of claws can be made slidable and articulated by means of a hydraulically operated actuator. The actuator and the claw pair, which interacts with this, can be controlled from the cab of the excavator.

In the case of the tools which can be coupled to the excavator boom, a second device-side coupling part is usually defined. The second coupling part has two spaced bearing plates or webs. At these webs two pairs of spaced bolts are provided. For coupling a working device, the fixed pair of claws grips one of the bolts. Following this, the slidable or pivotable jaw pair is brought into engagement with the remaining bolt.

A variety of manufacturers offer coupling devices for excavators, which are usually formed as described above. However, the couplings offered by the various manufacturers are not standardized, ie. H. the diameter of the bolts used and their distances from each other are usually different. Accordingly, claws of a claw pair and their distances are matched to the bolt. For these reasons, the various coupling devices are not compatible with each other. For the users, however, it would be desirable if the attachments could interact with clutches from different manufacturers.

A solution provides that the spaced-apart webs have a pair of first insert plates, which have a plurality of passage openings at a certain distance from each other. These through holes serve to receive the two bolts. If other bolt spacings are required, the pair of first insert plates can be exchanged for a pair of second insert plates. At the second insert plates through holes are provided which allow the required bolt spacing. However, the change of the insert plates is time consuming, since a plurality of locking screws must be removed and reinstalled and tightened after installation of the second insert plates: Due to the weight of the coupling, which often reaches 40 kg and more, the insert plates are usually not on site replaced.

From the DE 91 14 092 is an excavator bucket with an adjustable on his back suspension known. The suspension is used to connect the bucket with an excavator arm of an excavator and consists of two spaced suspension plates. At the individual suspension plates, a first and a second row of holes are provided, which serve to receive bolts. By means of the bolt, the bucket is pivotally fixed to the excavator. The bucket is coupled to the two bolts on different excavator arms, whose bolt receivers differ in their distances, can be coupled. Since the bolt receivers of different manufacturers usually differ in their widths, the distance between the suspension plates is adjustable relative to each other. This is achieved in that the suspension plates are guided displaceably in the longitudinal axis of the bucket spoon guides. For this purpose, sliding shoes are arranged on the suspension plates, which are slidably received in the guides. The shoes are provided with a lock so that the suspension plates can be fixed in the respective position.

However, the stability of the suspension plates by their displaceability and the first and second rows of holes is greatly reduced. Deterioration of this kind is particularly evident in the construction sector, in which individual components with many Tons are charged as disadvantageous. In addition, the adaptation of the suspension for fixing the bucket on excavator arms of different manufacturers proves to be time-consuming and complicated. First, the bolts must be completely removed and replaced by additional bolts with a corresponding length. On the other hand, the brakes must be solved, the suspension plates are moved and fixed again with the fasteners to take a the length of the bolt corresponding distance to each other. So it is not surprising that such adapter systems have not prevailed on the market so far.

A mainly in Germany widespread coupling system - hereinafter also referred to as a coupling of the first kind - consists of a first coupling part, which can be arranged on a excavator boom, and a second coupling part, which is attached to an attachment, such as bucket. Unlike other systems, however, this system has only one claw pair and one bolt.

The first coupling part has at a first end two receiving claws, and at the opposite second end a chamfered contact surface is formed, through which protrude two displaceable locking bolts.

The second coupling part has two parallel spaced webs, which are connected on one side by a transversely oriented to these receiving pin and on the other side by a latch plate. The locking plate is arranged obliquely, so that it can interact positively with the contact surface of the first coupling part. In the coupled state of the two coupling parts, the receiving claws of the first coupling part are hooked to the bolt. Further, the latch plate and the abutment surface abut each other, and the latch bolts are inserted into the through holes of the latch plate.

As stated above, this known coupling system dispenses with the interaction of two pairs of retaining claws of a first coupling part with the two bolts of a second coupling part which is present in many other coupling systems. In addition, the distance of the webs in this known coupling system only kind is different from the distance of the webs of other manufacturers. There are therefore no coupling parts from other manufacturers, which would be coupled to the first coupling part of the first kind. However, especially for expensive or rarely used tools and attachments, such a coupling part would be of great interest, since such can be used both by users of coupling systems of the first kind and by users of the coupling systems of the second kind.

Object of the invention

Object of the present invention is therefore to propose a coupling part for an attachment, such as a bucket, which can be easily and quickly adapted to the coupling parts of different manufacturers, which are provided at the distal end of an excavator, without affecting the stability of the coupling part affected is. In particular, it is an object to provide a coupling part for an attachment, which is adaptable to a quick-change system described above.

description

According to the invention the object is achieved in a coupling part for mounting on an attachment, such as bucket or gripper according to the preamble of claim 1, characterized in that at least a third coupling element and a first and second pair of mutually aligned through holes are provided, which pairs of through holes of the receptacle at least serve the third coupling element, and that are provided on at least one of the coupling elements spacer means to define a second distance which is smaller than the first distance. The coupling part according to the invention has the advantage that it can be used with coupling systems of various manufacturers and that the coupling part according to the invention can be converted very quickly from one coupling system to another. It is conceivable that the pairs of through holes have the same or a different distance to the upper longitudinal edges of the bearing plates.

It is advantageous if the first, second and at least third coupling element are designed either as a bolt of a first diameter or as a bolt of a second diameter or as a latch plate. The coupling part is thus extremely flexible and is adaptable to coupling systems of a plurality of manufacturers. In particular, the coupling part according to the invention is compatible with the clutch system, which is widely used in Germany. It enables the rapid coupling of coupling parts from at least two different manufacturers.

Characterized in that the spacer means are advantageously formed by a laterally provided on the inner walls spacer element, the free length of a bolt is simple and cheap reduced without the distance of the bearing plates would have to be changed. This has the advantage that the bearing plates can be firmly welded to the attachment.

It proves to be advantageous if the spacer means has an insertion bevel. The coupling part is forcibly guided by the insertion bevels during the coupling process and automatically centered between the two bearing plates after the coupling process.

In an advantageous embodiment, the spacer means are formed by a notch, milled or tapered on one of the coupling elements. The spacer means are in this case part of the coupling means and formed integrally therewith. As a result, the coupling part has fewer parts.

In a further preferred embodiment, at least one coupling means is fixedly connected to the bearing plates. The bearing plates are permanently spaced by the at least one coupling means. The bearing plates can also be fastened by customers themselves to a corresponding attachment, in particular weldable. It is conceivable in addition to a welded connection between the bearing plates and the coupling means and a detachable screwed connection.

Conveniently, the first coupling means is formed by a locking plate, in which two spaced receiving openings are provided for receiving two locking bolts of a second coupling part. The coupling part can be used by providing the locking plate with the known coupling system. Instead of a latch plate may also be provided a bolt.

In a particularly preferred embodiment, the first coupling means by a first bolt with a free length of the bolt extending flattening and two recesses, which are provided for receiving two locking bolts of a second coupling part formed.

In a further preferred embodiment, the second and third coupling means are each formed by a second and third bolts, which can be received in the passage openings. This embodiment ensures the use of the inventive coupling part with a known coupling part, which requires a larger bolt diameter and a greater free length of the bolt than the coupling system.

Characterized in that advantageously a fourth coupling element is provided in the form of a bolt, different bolt diameter can be realized by using the fourth bolt instead of the third bolt.

Advantageously, the second, third and fourth bolts are fastened without tools to the bearing plates for rapid fixing. A loosening and fixing the coupling elements is therefore directly on site, for example, by the excavator operator himself, without difficulty feasible.

It proves to be advantageous if an opening is provided at the first end of the second, third and fourth bolts, which extends transversely to the longitudinal axis and serves to receive a Sicherungssplints. Securing and releasing the bolts when they are received in the bearing plates can be done quickly and safely.

Conveniently, a circular piece of wire is attached to one end of the Sicherungssplints, which selbiges in receiving the Sicherungssplints in the third bolt, whereby the release of the splint is prevented. This cost-effective splint lock reliably prevents unintentional release of the pin from the bolts.

At the second end of the second, third or fourth bolt, the diameter of the bolt is advantageously widened so that a bolt head is formed at the second end, which has a flattening. The bolt head can thereby cooperate advantageously with projections provided on at least one of the outer sides of the bearing plates. The bolts are thereby taken against rotation in the bearing plates to prevent unwanted position changes.

Advantageously, the bearing plates are each in one piece. This serves for the stability of the bearing plates and reduces the number of individual parts of the coupling part.

To simplify the mounting of the coupling part on an attachment, the coupling part is preferably welded to a mounting holes having mounting plate. A customer who has no welding equipment available through the mounting plate is able to determine the coupling part itself to an attachment.

Another aspect of the invention relates to a coupling part in which at least a third and fourth coupling element in the form of a third and fourth bolt are provided. In addition, preferably a first and second pair of mutually aligned through holes are provided, which pairs of through holes serve to receive at least the third or fourth bolt. Advantageously, a spacer means in the form of a taper is provided at least on the third bolt to define a second distance which is smaller than the first distance. Of the The advantage of this aspect lies in the possibility of coupling the coupling part with coupling parts of at least two different manufacturers.

According to one embodiment, the locking plate and the second bolt are advantageously fixedly connected to the bearing plates. This leads to increased stability between the bearing plates. It also makes it possible for the customer to weld the coupling itself to the attachment.

In a further aspect of the invention at least a third and fourth coupling element in the form of a third and fourth bolt and a first and second pair of mutually aligned through holes are provided, which pairs of through holes serve to receive at least the third or fourth bolt, and at least on the third and fourth bolts, spacing means in the form of a taper are provided to define a second distance which is smaller than the first distance. This coupling part is then used when the coupling part of the second type requires a smaller bolt diameter and a smaller free bolt length than the coupling part of the first type.

To increase stability, a connecting web is advantageously provided in this coupling part, and the connecting web and the locking plate are firmly connected to the bearing plates, since none of the bolts is firmly connected to the retaining webs.

Another aspect of the invention relates to a coupling part in which at least a third coupling element in the form of a third bolt and a first and second pair of mutually aligned through holes are provided, which pairs of through holes serve to receive the third bolt, and that at least at the first bolt spacer means are provided in the form of a taper to define a second distance, which is smaller than the first distance. In this coupling part, the task of reducing the free pin length is taken from a taper at least on the first bolt.

Advantageously, in this coupling part of the first and second bolts are firmly connected to the bearing plates. This leads to a compact sales unit with fixedly spaced bearing plates and a few items.

The invention also relates to an attachment, such as bucket or grapple, on which a coupling part is defined according to one of claims 1 to 23. The user of this attachment is allowed to use the attachment with coupling systems of the first and second type.

Further advantages and features will become apparent from the following description of an embodiment of the invention with reference to the figures. It shows in not to scale representation:

1 a first embodiment of the inventive coupling part in a first perspective view;

2 : the coupling part off 1 in a second perspective view;

3 : the coupling part off 1 in a view obliquely from below and partially cut away;

4 : the coupling part off 1 arranged on a mounting plate;

5 A second embodiment of the inventive coupling part in a perspective view and

6 : A perspective view of a third embodiment of the inventive coupling part.

The 1 to 4 show a first embodiment of the inventive coupling part, which overall with the reference numeral 11 is designated. The coupling part 11 has two bearing plates arranged at a distance parallel to each other 13a and 13b , On the one hand serve the bearing plates 13a . 13b the determination of the coupling part 11 on an attachment, such as an excavator bucket. These are the lower longitudinal sides of the bearing plates 13a . 13b usually welded to the attachment. On the other hand serve the bearing plates 13a . 13b the attachment of a first and second coupling pin 15 and 17 , For coupling the attachment at the distal end of a working device, in particular an excavator, the coupling part acts 13 together with another coupling part.

As the 1 to 4 show are the coupling bolts 15 . 17 at opposite ends of the bearing plates 13a . 13b z. B. by welding, set. The bearing plates 13a . 13b are therefore by the coupling bolts 15 . 17 firmly and immovably connected. Between the coupling bolts 15 . 17 are a first and second pair of aligned through holes 19a . 19b and 21a . 21b on the bearing plates 13a . 13b provided, which may have the same or a different diameter. The first and second through holes serve to receive a third coupling pin 23 ,

For torsion-proof reception in the passage openings 19a . 19b or 21a . 21b owns the bolt 23 at its first end a bolt head 25 , which has a slightly larger diameter than the third bolt 23 and a lateral flattening 27 having. The bolt head flat 27 works with extensions 29a . 29b together. The 1 shows that the extensions 29a . 29b on the outside of the bearing plate 13a below the passage openings 19a . 21a are provided. Act on the third bolt 23 a torque, so the bolt head is supported 25 on the extension 29a or 29b from.

In 2 is shown that the third bolt 23 on the bearing plates 13a . 13b tool-free attachable and detachable. For this purpose has the bolt 23 an opening at its second end 31 into which a sapwood 33 is receivable, which the bolt 23 serves as an extract security. To secure the splint 33 at the third bolt 23 is at one end of the splint a circular piece of wire 35 , which when taking the splint 33 in the opening 31 the third bolt 23 includes. The bolt is through the piece of wire 35 reliable on the third bolt 23 held.

The first bolt 15 is adapted to a quick-change system of the first kind. These are on the first bolt 15 two spacers 36a . 36b pushed on and on the insides of the bearing plates 13a . 13b established. Through the spacers 36a . 36b is at the first bolt 15 a second, smaller distance between the bearing plates 13a . 13b defines which the coupling part of the first kind, which is arranged at the distal end of an excavator arm, for its play-free fixing to the coupling part 11 requires. The spacers 36a . 36b are preferably conical, ie their diameter decreases in the direction of the center of the bolt. This conical design facilitates the centering of the coupling part of the first kind between the bearing plates 13a . 13b , The contact surface described in the introduction of this coupling part acts with a flattening 37 of the first bolt, which extends over the free length of the bolt 15 extends. A first and second recess 39a . 39b are at the bottom of the first bolt 15 provided transversely to its longitudinal axis. The recesses 39a . 39b serve to accommodate the two sliding latch bolt of the coupling part of the first kind. A third center of the first bolt 15 provided recess 41 serves to carry out a key, with the help of which the locking bolts are manually displaceable. If the attachment is to be coupled by 180 degrees twisted on the coupling part of the first kind, so must also on the third bolt 23 a flattening 37 and recesses 39a . 39b be provided.

To fix the coupling part of the first kind is the third bolt 23 in the passageways 21a . 21b added. The distance between the first and third pin 15 . 23 corresponds exactly to the distance that is necessary for the coupling part 11 can be coupled to the coupling part of the first kind.

Is the third bolt 23 in the passageways 19a . 19b received, so serves the second and third bolts 17 . 23 the inclusion of a coupling part of the second kind. The distances of the second and third bolt and the distances of the bearing plates correspond 13a . 13b exactly the distances which are necessary to the coupling part of the second kind on the coupling part 11 to couple.

In the 4 is shown that the coupling part 11 also on a mounting plate 43 attached, preferably can be welded. The fixing of the mounting plate 43 For example, screws or rivets are used on the attachment through mounting holes 45 can be passed.

In the 5 is a second embodiment of the inventive coupling part 11 shown. In contrast to the first embodiment of the 1 to 4 is the first bolt 15 through a slanted latch plate 47 replaced. At the latch plate 47 are two receiving openings 49 provided, which serve to receive the locking bolt of a coupling part of the first kind. In this embodiment, however, the coupling of a coupling part of the first type requires a different bolt diameter than the coupling part of the second kind. In order to meet this requirement, there is in the passage openings 21a . 21b a fourth bolt 51 received. At the fourth bolt is a cut 53 provided, on the one hand fulfills the task to serve the coupling part of the first kind as a spacer. On the other hand, the milling is done 53 the requirement that the coupling part of the first type requires a smaller bolt diameter than the coupling part of the second kind. This may be necessary, for example, when holding claws of the coupling parts of the first and second type have different sizes. For coupling the coupling part of the first kind to the coupling part 11 is the fourth bolt 51 in the passageways 21a . 21b added. The coupling part of the first kind acts with the fourth bolt 51 and the latch plate 47 together. For coupling the coupling part of the second kind to the coupling part 11 is the fourth bolt 51 removed and the third bolt 23 is in the through holes 19a . 19b added. The coupling part of the second type acts as in the first embodiment with the second bolt 17 and the third bolt 23 together.

6 shows a third embodiment of the inventive coupling part 11 , These Embodiment allows the coupling of a coupling part of the first or second type, wherein the coupling part of the first type, in contrast to the previous embodiment requires a larger bolt diameter and a larger free bolt length than the coupling part of the second kind. To meet these requirements is the second bolt 17 no longer, as in the two previous embodiment, fixed to the web plates 13a . 13b connected but is in the through holes 21a . 21b Removable recorded. The stable spacing of the web plates 13a . 13b serves in this embodiment, a connecting web 55 which is below the passage openings 21a . 21b firmly with the bearing plates 13a . 13b connected is.

In contrast to the embodiment of 5 own the second and third bolts 17 . 23 millings 53 , are formed by the edge heels spacer means and through which the diameter of the bolt 17 . 23 are reduced. For coupling a coupling part of the second type, therefore, the second and third bolts 17 . 23 in the passageways 19a . 19b respectively. 21a . 21b added. For coupling a coupling part of the first kind are the second and third bolts 17 . 23 to remove and the fourth bolt 51 in the passageways 21a . 22b added.

It is understood that the features of the three embodiments of the inventive coupling part 11 for the adaptation to coupling parts of the first and second kind also still different among each other are combined, in order to obtain the greatest possible adjustment possibilities.

LIST OF REFERENCE NUMBERS

11

coupling part

13a, 13b

bearing plates

15

First coupling bolt

17

Second coupling bolt

19a, 19b

First passages

21a, 21b

Second through holes

23

Third coupling bolt

25

bolt head

27

Lateral flattening

29a, 29b

projections

31

opening

35

Circular piece of wire

33

cotter

36a, 36b

spacers

37

Bolzenabflachung

39a, 39b

First and second recesses

41

Third recess

43

mounting plate

45

mounting holes

47

locking plate

49

receiving openings

51

Fourth bolt

53

milled

55

connecting web

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 9114092 [0008]

Claims (24)

Coupling part ( 11 ) for mounting on an attachment, such as an excavator bucket or grab, which coupling part ( 11 ) can cooperate with at least one further provided at the distal end of a working device, in particular an excavator boom, second coupling part to connect the attachment with the implement with - two spaced from each other at a first distance and mutually parallel bearing plates ( 13a . 13b ), - a first coupling element ( 15 ) and at a distance from the first coupling element ( 15 ) provided second coupling element ( 17 ), which coupling elements between the bearing plates ( 13a . 13b ) and serve to couple the second coupling part, characterized in that at least one third coupling element ( 23 ) and a first and second pair of aligned through holes ( 19a . 19b . 21a . 21b ), are provided, which pairs of passage openings of the receptacle of at least the third coupling element ( 23 ) and that on at least one of the coupling elements ( 15 . 17 . 23 ) Distance means ( 36a . 36b . 53 ) are provided to define a second distance which is smaller than the first distance. Coupling part ( 11 ) according to claim 1, characterized in that the first, second and at least third coupling element ( 15 . 17 . 23 ) either as a bolt of a first diameter or as a bolt of a second diameter or as a bolt plate ( 47 ) can be executed. Coupling part ( 11 ) according to one of claims 1 to 2, characterized in that the spacer means by a laterally on the inner walls of the bearing plates ( 13a . 13b ) provided spacer element are formed. Coupling part ( 11 ) according to one of claims 1 to 3, characterized in that the spacer means by a respective spacer ( 36a . 36b ) are formed, which are opposite to each other on the inner walls in the region of one of the coupling elements ( 15 . 17 . 23 ) are provided. Coupling part ( 11 ) according to one of claims 1 to 4, characterized in that the spacer means ( 36a . 36b ) has an insertion slope. Coupling part ( 11 ) according to one of claims 1 to 2, characterized in that the spacer means by a notch, milled cut ( 53 ) or taper on one of the coupling elements ( 15 . 17 . 23 ) are formed. Coupling part ( 11 ) according to one of claims 1 to 6, characterized in that at least one coupling agent ( 15 . 17 . 23 ) fixed and unsolvable with the bearing plates ( 13a . 13b ) connected is. Coupling part ( 11 ) according to one of claims 1 to 7, characterized in that at least one connecting web ( 55 ) is provided, which fixed and insoluble with the bearing plates ( 13a . 13b ) connected is. Coupling part ( 11 ) according to one of claims 1 to 8, characterized in that at least two coupling agents ( 15 . 17 . 23 ) are firmly connected to the bearing plates. Coupling part ( 11 ) according to one of claims 1 to 9, characterized in that the first coupling means by a latch plate ( 47 ) is formed; in which two spaced receiving openings ( 49 ) are provided for receiving two locking bolts of a second coupling part. Coupling part ( 11 ) according to one of claims 1 to 9, characterized in that the first coupling means by a first bolt ( 15 ) with a milling ( 53 ) is formed. Coupling part ( 11 ) according to one of claims 1 to 9, characterized in that the first coupling means by a first bolt ( 15 ) with a flattening ( 37 ), which extends over the free length of the bolt and two recesses ( 39a . 39b ), which are provided for receiving two locking bolts of a second coupling part, is formed. Coupling part ( 11 ) according to one of claims 1 to 12, characterized in that the second and third coupling means by a respective second and third bolt ( 17 . 23 ) formed in the passage openings ( 19a . 19b . 21a . 21b ) is receivable. Coupling part ( 11 ) according to one of claims 1 to 13, characterized in that a fourth coupling element in the form of a fourth bolt ( 51 ) is provided. Coupling part ( 11 ) according to claim 14, characterized in that at the second end of the second, third or fourth bolt ( 17 . 23 . 51 ) the diameter of the bolt is slightly widened so that at the second end a bolt head ( 25 ), which is a flattening ( 27 ) having. Coupling part ( 11 ) according to claim 15, characterized in that on at least one of the outer sides of the bearing plates ( 13a . 13b ) Extensions ( 29a . 29b ) at a short distance to the Through holes ( 19a . 19b . 21a . 21b ) are provided, with which the flattening ( 27 ) of the bolt head ( 25 ) to engage the second, third and fourth pins ( 17 . 23 . 51 ) against rotation in the passage openings ( 19a . 19b . 21a . 21b ) to keep. Coupling part ( 11 ) according to one of claims 1 to 16, characterized in that a mounting plate ( 43 ) with mounting holes ( 45 ) is provided, on which the bearing plates ( 13a . 13b ) are attached. Coupling part ( 11 ) for mounting on an implement, such as an excavator bucket or gripper, which coupling part can cooperate with at least one further coupling part provided at the distal end of a working implement, in particular an excavator boom, for connecting the attachment to the work implement with two of them in one first distance and mutually parallel bearing plates ( 13a . 13b ), - a first coupling element in the form of a latch plate ( 47 ) and provided at a distance from the first coupling element second coupling element in the form of a second bolt ( 17 ), which coupling elements between the bearing plates ( 13a . 13b ) and serve the coupling of the second coupling part, characterized in that at least a third and fourth coupling element in the form of a third and fourth bolt ( 23 . 51 ) and a first and second pair of aligned through holes ( 19a . 19b . 21a . 21b ) are provided, which pairs of through holes of the receptacle of at least the third or fourth bolt ( 23 . 51 ), and that at least on the third bolt ( 23 ) Distance means in the form of a rejuvenation ( 53 ) are provided to define a second distance which is smaller than the first distance. Coupling part ( 11 ) according to claim 18, characterized in that the latch plate ( 47 ) and the second bolt ( 17 ) fixed to the bearing plates ( 13a . 13b ) are connected. Coupling part ( 11 ) for mounting on an attachment, such as bucket or grapple, which coupling part with at least one further at the distal end of a working device, in particular an excavator boom, provided second coupling part cooperate to connect the attachment with the implement with - two of each other in a first Distance and mutually parallel bearing plates ( 13a . 13b ), - a first coupling element in the form of a latch plate ( 47 ) and provided at a distance from the first coupling element second coupling element in the form of a second bolt ( 17 ), which coupling elements between the bearing plates ( 13a . 13b ) and serve the coupling of the second coupling part, characterized in that at least a third and fourth coupling element in the form of a third and fourth bolt ( 23 . 51 ) and a first and second pair of aligned through holes ( 19a . 19n . 21a . 21b ) are provided, which pairs of through holes of the receptacle of at least the third or fourth bolt ( 23 . 51 ) and that at least on the third and fourth bolts ( 23 . 51 ) Distance means in the form of a rejuvenation ( 53 ) are provided to define a second distance which is smaller than the first distance. Coupling part ( 11 ) according to claim 20, characterized in that a connecting web ( 55 ) is provided and that the connecting web ( 55 ) and the latch plate ( 47 ) fixed to the bearing plates ( 13a . 13b ) are connected. Coupling part ( 11 ) for mounting on an attachment, such as bucket or grapple, which coupling part with at least one further at the distal end of a working device, in particular an excavator boom, provided second coupling part cooperate to connect the attachment with the implement with - two of each other in a first Distance and mutually parallel bearing plates ( 13a . 13b ), - a first coupling element in the form of a first bolt ( 15 ) and provided at a distance from the first coupling element second coupling element in the form of a second bolt ( 17 ), which coupling elements between the bearing plates ( 13a . 13b ) and serve the coupling of the second coupling part, characterized in that at least a third coupling element in the form of a third bolt ( 23 ) and a first and second pair of aligned through holes ( 19a . 19b . 21a . 21b ) are provided, which pairs of through holes of the receptacle of the third bolt ( 23 ), and that at least on the first bolt ( 15 ) Distance means in the form of a rejuvenation ( 53 ) are provided to define a second distance which is smaller than the first distance. Coupling part ( 11 ) according to claim 22, characterized in that the first and second bolts ( 15 . 17 ) fixed to the bearing plates ( 13a . 13b ) are connected. An attachment, such as an excavator bucket or grab, on which a coupling part ( 11 ) is defined according to one of claims 1 to 23.

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