Quick Change Device

Abstract

To provide a quick change device which has a wide application range and can be universally used.SOLUTION: A quick change device 1 for exchanging an attachment on a construction machine includes: a body 2; and parallel lateral side faces 3 having first and second bearing bushes 6 and 7 arranged opposite to each other so as to receive an attachment pin 8. In order to enlarge an application range, at least the two oppositely arranged first bearing bushes 6 are rotated around an off-set axis with respect to central axes of receiving holes 20 of the first bearing bushes 6 and thereby can be inserted to a first passage opening part 4 arranged so as to face the lateral side faces 3 at different angles, and has outer contours 17 for being rotatably and tightly engaged with complementary inner contours 18 of the first passage opening part 4.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The invention relates to a quick-change device according to the preamble of claim 1. [Background technology]

[0002] This type of quick-change device is used to easily and conveniently exchange different attachments on construction machinery, for example swivel buckets, claws, shears, compactors, magnets, hydraulic hammers or other attachments can be coupled and detached from, for example, the boom of an excavator, from the operator's cab within seconds and with a high level of safety.

[0003] US Pat. No. 5,399,363 discloses a typical quick-change device. This quick-change device includes a body and a support with parallel lateral sides, which can be mounted on a boom arm of an excavator. On one side of the body is arranged a first receptacle for a first coupling element arranged on an attachment or adapter, and on the other side a second receptacle with a locking element for releasably holding a second coupling element, which locking element can be moved between an open position and a locked position. In order to be able to mount the support on the excavator, rear and front bearing bushes arranged oppositely for receiving mounting pins are arranged on the lateral sides of the support. However, these bearing bushes are arranged rigidly and immovably on the lateral sides, so that the position of the mounting pins is fixed and cannot be easily changed. As a result, the quick-change device can only be mounted on boom arms specifically intended for this purpose. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] German Patent No. 102017110586 A1 Specification Summary of the Invention

[0005] The problem to be solved by the present invention is to make available a quick-change device of the above-mentioned type which has a wider range of application and can be used universally.

[0006] This problem is solved by a quick-change device having the features of claim 1. Advantageous embodiments and advantageous refinements of the invention are set out in the dependent claims.

[0007] The quick-change device according to the invention comprises at least two oppositely arranged first bearing bushes which can be inserted in different angular positions into the first oppositely arranged passage openings of the lateral side by rotating them about an axis offset with respect to the central axis of the receiving holes of the bearing bushes and have an external contour for rotationally tightly engaging in the complementary internal contour of the passage openings, whereby the position of the receiving holes of the bearing bushes relative to the lateral side can be easily changed and adjusted to the specific respective requirements. Due to the external contours on the bearing bushes and the complementary internal contours of the passage openings of the lateral side an interlocking interengaging connection between the bearing bushes and the lateral side is formed, thus enabling a connection which is particularly stable and reliably prevents undesired displacements.

[0008] In a particularly advantageous embodiment of the invention, the outer contour on the first bearing bush and the inner contour of the first passage opening are configured to have a polygonal profile. However, the interlocking connection between the first bearing bush and the lateral side can also be achieved, for example, by external and internal spline teeth, by a splined shaft and splined hub profile or by an external and internal polygonal profile.

[0009] The external contour may preferably be disposed on an engagement portion of the bearing bush, which engagement portion engages in the first passage opening. For mounting on the lateral side, the first bearing bush may include a mounting flange having a tapped hole.

[0010] An additional mounting means can be achieved by arranging a second bearing bush on the lateral side opposite a second passage opening configured as a slotted hole and fixing these against displacement by an interlocking connection.

[0011] The interlocking connection can be formed, for example, by arcuate recesses on the upper and lower surfaces of the second passage opening and a complementary arcuate ridge on the second bearing bushing, which can be disposed over an engagement region of the second bearing bushing that engages within the second passage opening.

[0012] The second bearing bush can be mounted on the lateral side by a retaining plate, which can be arranged, for example, on an outer surface of the lateral side and fastened to the second bearing bush by means of screws.

[0013] Further features and advantages of the invention emerge from the following description of examples of preferred embodiments, which refer to the drawings in which: [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is an exploded view of a quick change device according to the present invention. [Diagram 2] FIG. 2 is a longitudinal cross-sectional view of a lateral side plane of the quick change device shown in FIG. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] 1 shows a quick-change device 1 for easy and convenient exchange of different attachments (mountings, fittings) on a construction machine, in particular an excavator. By using this type of quick-change device 1, for example a swivel bucket, a claw, a shear, a compactor, a hydraulic hammer or other mechanical and / or hydraulic attachments can be coupled and decoupled from the driver's cab to the boom or other attachment parts of the excavator or a different construction vehicle.

[0016] The quick-change device 1 comprises a support in the form of a welded or cast part, which comprises a main component 2 and two parallel lateral sides 3 with passage openings 4 and 5 for receiving bearing bushes 6 and 7 of parallel connecting pins 8. By means of the connecting pins 8 the quick-change device 1 can be mounted, for example, on the boom arm of an excavator or other work equipment.

[0017] On the one hand, the main component 2, which has an inverted U-shaped profile in cross section, has a rearwardly opening first receptacle 9 for receiving and holding a first bolt-type fastening element and, on the other hand, a downwardly opening second receptacle 10 for receiving and holding a second bolt-type fastening element. The bolt-type fastening element can for example be arranged on the attachment or on an adapter which can be attached to the attachment.

[0018] In the illustrated embodiment example, the rear side of the body part 4[sic;2] of the quick-change device 1 has two first spaced apart receptacles 9 of a first coupling element, and the front side has two spaced apart receptacles 10 of a second coupling element. The rearwardly opening first receptacle 9 has the shape of a fork or claw. The downwardly opening second receptacle 10 has a curved lower abutment surface 11 for abutting a second bolt-type coupling element. A locking mechanism is arranged in the two receptacles 10 on the front side of the body part 4[sic;2], each having a bolt-type locking element 13 movably guided in a guide hole 12 in the body part 2 and movable by a drive between a retracted open position and an extended locked position. In the extended locking position, the downwardly open second receptacle 10 is closed on the bottom side by a bolt-type locking element 13, which is movably arranged in a guide hole 12 in the body part 2, such that the second bolt-type fastening element is engaged and held from below by the bolt-type locking element 13. Instead of the bolt-type locking element 13, a locking element in the form of a hook or of any other shape can also be arranged on the body part 2 of the support.

[0019] To couple an attachment by means of the quick-change device 1, the quick-change device 1, which is generally arranged on the boom of an excavator, is first moved so that a first coupling element arranged on the adapter or directly on the attachment is retracted into a claw- or fork-type receptacle 9 on one side of the quick-change device 1. Then, the quick-change device 1 with the locking element 13 still retracted is pivoted around the first bolt-type coupling element so that a second coupling element on the adapter or on the attachment abuts against an abutment surface 11 of a downwardly open receptacle 10 on the other side of the quick-change device 1. The locking element 13, which is movably arranged in a guide hole 12 in the body part 2 of the support, can then be hydraulically extended so that the second bolt-type coupling element is engaged from below by two bolt-type locking elements 13 on the quick-change device 1, thus holding the attachment on the quick-change device 1.

[0020] As shown in Fig. 1 and Fig. 2, two oppositely arranged rear passage openings 4 for receiving a first bearing bush 6 and two oppositely arranged front passage openings 5 ​​for receiving a second bearing bush 7 are arranged on the two lateral sides 3 of the support. The rear first bearing bush 6 has an engagement portion 14 for engagement in the rear passage opening 4 and a mounting flange 16 with a tapped hole 15. The engagement portion 14 of the rear bearing bush 6 has an external contour 17 configured here as an external hexagonal profile for interlocking engagement in a complementary internal contour 18, configured here as an internal hexagonal profile, of the rear passage opening 5. This allows the first bearing bush 6 in the passage opening 4 to be rotated in different angular positions around an axis 19 shown in Fig. 1 and inserted in the passage opening 5 in a specific position and fixed against rotation.

[0021] In the first bearing bush 6, a receiving hole 20 is arranged eccentrically with respect to the axis 19. The central axis 21 of the receiving hole 20 is offset with respect to the axis 19 so that the position of the receiving hole 20 with respect to the lateral side 3 can be changed by rotating the first bearing bush 6. Around the passage opening 5 in the lateral side 3, a number of through holes 22 for screws 23 are arranged, which are aligned with the tapped holes 15 in the mounting flange 16. The bearing bush 6, inserted in a certain angular position in the passage opening 4 in the lateral side 3, can be mounted on the lateral side 3 by the screws 23.

[0022] The external contour 17 and the complementary internal contour 18 are preferably configured to have a polygonal profile. However, the connection between the bearing bush 6 and the lateral side 3 can also be achieved, for example, by external and internal splined teeth, by a splined shaft and a splined hub profile or by an external and internal polygonal profile.

[0023] The forwardly arranged second passage opening 5 of the lateral side 3 is configured as a slotted hole with an arch-shaped recess 24 on the upper and lower faces. The forwardly arranged second bearing bush 7 has an elliptical body with a flange 25 and an engagement area 26 for interlocking engagement in the forward passage opening 5.

[0024] As Fig. 2 shows, the engagement areas 26 on its upper and lower faces have arch-shaped ridges 27 complementary to the recesses 24. A receiving hole 28 for receiving the mounting pin 8 is also arranged in the front bearing bush 7. Due to the design of the front passage opening 5 and the engagement areas 26, the bearing bush 7 in the passage opening 5 configured as a slotted hole can be inserted at different positions on the lateral side 3 and fixed there against displacement. The position of the receiving hole 28 relative to the lateral side 3 can therefore be easily changed.

[0025] The front bearing bush 7 is attached to the lateral side 3 by a retaining plate 29, shown in FIG. 1, which is placed on the outer surface of the lateral side 3 and screwed to the bearing bush 7 by means of screws 30. For this purpose, the retaining plate 29 has a through hole 31 and the bearing bush 7 has a complementary tapped hole 32. By means of a mounting element 33 and a tapped hole 34 in the lateral side 3, the mounting pin 8 can be locked in place on the lateral side 3. [Explanation of symbols]

[0026] 1 Quick Change Device 2 Main unit 3 Side surface 4 1st passage opening 5 2nd passage opening 6 No. 1 bearing bush 7 No. 2 bearing bush 8 Mounting Pins 9 First Receptacle 10 Second Receptacle 11 Contact surface 12 Guide hole 13 Locking element 14 Engagement part 15 Tapped holes 16 Mounting flange 17 External Contour 18 Internal Contours 19 Axis 20 Receiving hole 21 Center axis 22 Through hole 23 Screw 24 Depression 25 Flange 26 Engagement area 27 Prominence 28 Receiving hole 29 Retaining Plate 30 Screws 31 Through hole 32 tapped holes 33 Mounting elements 34 Tapped holes

Claims

1. A quick-change device (1) for exchanging attachments on a construction machine, the quick-change device comprising a body (2) and parallel lateral sides (3) having oppositely arranged first and second bearing bushes (6, 7) for receiving mounting pins (8), at least two oppositely arranged first bearing bushes (6) being insertable in different angular positions into oppositely arranged first passage openings (4) in the lateral sides (3) by rotating the first bearing bushes (6) about an axis (19) offset with respect to a central axis (21) of a receiving hole (20) of the first bearing bushes (6), and having an external contour (17) for rotationally rigidly engaging within a complementary internal contour (18) of the first passage openings (4); 1. A quick-change device (1), characterized in that the outer contour (17) on the first bearing bush (6) and the inner contour (18) on the first passage opening (4) are configured to have a polygonal outer shape.

2. 2. The quick change device (1) according to claim 1, characterized in that the external contour (17) is arranged on an engagement portion (14) of the first bearing bush (6), which engagement portion engages in the first passage opening (4).

3. 3. The quick change device (1) according to claim 1 or 2, characterized in that the first bearing bush (6) comprises a mounting flange (16) having a tapped hole (15) for mounting the first bearing bush (6) on the lateral side (3).

4. 4. The quick-change device (1) according to claim 1, wherein the oppositely arranged second bearing bush (7) is arranged at the lateral side (3) in a second passage opening (5) configured as a slotted hole and is fixed against displacement by an interlocking connection (24, 27).

5. 5. The quick-change device (1) according to claim 4, characterized in that the interlocking connection (24, 27) is formed by an arched recess (24) on the upper and lower surfaces of the second passage opening (5) and a complementary arched protuberance (27) on the second bearing bush (7).

6. 6. The quick-change device (1) according to claim 5, characterized in that the arch-shaped ridge (27) is arranged in an engagement area (26) of the second bearing bush (7), which engagement area engages in the second passage opening (5).

7. 7. A quick-change device (1) according to any one of the preceding claims, characterized in that the second bearing bush (7) is mounted on the lateral side (3) by means of a retaining plate (29).

8. 8. The quick-change device (1) according to claim 7, characterized in that the retaining plate (29) is arranged on the outer surface of the lateral side (3) and is screwed to the second bearing bush (7) by means of screws (30).

9. A quick-change device (1) according to any one of the preceding claims, characterized in that the mounting pin (8) is locked in place on the lateral side (3) by means of a mounting element (33).

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