Mobile crane and placement device for same

Patent metadata

Field	Value
Publication number	US-12187586-B2
Application number	US-202218064854-A
Country	US
Kind code	B2
Filing date	Dec 12, 2022
Priority date	Dec 14, 2021
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

The invention relates to a mobile crane, that comprises a mobile undercarriage and a superstructure rotatably supported on the undercarriage and having a boom and a ballasting device. The ballasting device picks up or places down one or more counterweight elements by means of a hoisting device. In accordance with the invention, a placement device is provided that is connected to the undercarriage and comprises at least one movable placement part that is movable from a travel position into a placement position and vice versa. In this respect, the travel position is characterized in that the length of the undercarriage is reduced, and the crane is travelable on the construction site, whereas the placement position is characterized in that counterweight elements can be placed on the placement part by means of the ballasting device and the length of the undercarriage is increased in comparison with the travel position.

First claim

The invention claimed is:

1. A mobile crane, comprising a mobile undercarriage and a superstructure rotatably supported thereon and having a boom and a ballasting device, wherein the ballasting device is adapted to take up or place down one or more counterweight elements by means of a hoisting device,
wherein
a placement device connected to the undercarriage and having at least one movable placement part that is movable from a travel position reducing the length of the undercarriage into a placement position which increases the length of the undercarriage and in which counterweight elements can be placed on the placement part by means of the ballasting device, and vice versa.

2. A crane in accordance with claim 1 , wherein the placement device is adapted to remain at the undercarriage during crane operation and/or during the traveling of the crane.

3. A crane in accordance with claim 1 , wherein the placement part extends substantially transversely to the longitudinal axis of the undercarriage in the travel position and is outwardly pivotable into the placement position in which the placement part extends substantially in parallel with the longitudinal axis of the undercarriage, with the placement part having one or more placement areas at an upper side on which counterweight elements can be placed.

4. A crane in accordance with claim 3 , wherein the placement part is pivotably supported about a vertical pivot axle, with the pivot axle being off center with respect to the longitudinal axis of the undercarriage, including laterally at the placement device.

5. A crane in accordance with claim 3 , wherein the placement device comprises a first placement part and a second placement part on which counterweight elements can be placed in the placement position, with the placement parts being pivotable about vertical pivot axles that are spaced apart from one another and that are located laterally on oppositely disposed sides of the placement device.

6. A crane in accordance with claim 5 , wherein the placement device comprises two parallel frame parts, including frame plates, to whose front sides the placement parts are connected in an articulated manner, with the frame parts being directly connected to the undercarriage.

7. A crane in accordance with claim 6 , wherein the frame parts have different lengths in the direction of the longitudinal axis of the undercarriage and the pivot axles of the placement parts have different distances from the undercarriage, with the placement parts being plate-like and being respectively aligned in parallel with one another in the transport position and placement position.

8. A crane in accordance with the preceding claim and in accordance with one of the claim 6 , wherein at least two centering elements are provided, with at least one centering element being fixedly connected to each of the frame parts.

9. A crane in accordance with claim 1 , wherein the pivotable support of the placement part takes place via two separate pivot bearings that are arranged above one another and are designed differently.

10. A crane in accordance with claim 9 , wherein the placement part has locking means by means of which it can be locked in the travel position and in the placement position respectively.

11. A crane in accordance with claim 10 , wherein the locking means are formed at one of the pivot bearings, including at an upper pivot bearing, and comprise or represent cutouts into which a locking element, including a locking bolt, can be pushed in the corresponding position of the placement part.

12. A crane in accordance with claim 1 , wherein a lower pivot bearing is thicker than an upper pivot bearing, with the upper pivot bearing being adapted to take up predominantly horizontal forces and/or the lower pivot bearing being adapted to take up horizontal and vertical forces, including the weight force of the counterweight elements placed on the placement part.

13. A crane in accordance with claim 1 , wherein the placement device comprises at least one centering element that is configured to cooperate with a corresponding counter-centering element at the lower side of the counterweight element for the fine positioning of a counterweight element to be placed on the placement device, with the at least one centering element being arranged at an upper side of the placement device and/or being configured as an upwardly protruding projection.

14. A crane in accordance with claim 1 , wherein the placement device comprises a ballast element and acts as central ballast, with the placement device comprising two parallel frame parts, to whose front sides a respective placement part is connected in an articulated manner and with the ballast element being arranged between the frame parts.

15. A crane in accordance with claim 1 , wherein the crane is a crawler crane.

Assignees

• Liebherr Werk Ehingen

Inventors

• Eberhardt Lars
• Boos Bernd

Classifications

• B66C23/74 Primary

  separate from jib · CPC title

• B66C2700/0371

  on a turntable · CPC title

• B66C23/72 Primary

  Counterweights or supports for balancing lifting couples · CPC title