Mobile crane having a counterweight device

Patent metadata

Field	Value
Publication number	US-12509332-B2
Application number	US-202318164156-A
Country	US
Kind code	B2
Filing date	Feb 3, 2023
Priority date	Mar 15, 2022
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

Abstract

The disclosure relates to a mobile crane that comprises a travelable undercarriage, a superstructure rotatably supported on the undercarriage, and a counterweight device couplable to the superstructure. The counterweight device comprises a counterweight base plate and at least one connection means for raising the counterweight device and for coupling it to the superstructure. The disclosure furthermore relates to a counterweight device for a mobile crane in accordance with the disclosure.

First claim

The invention claimed is:

1 . A mobile crane comprising a travelable undercarriage, a superstructure rotatably supported on the undercarriage, and a counterweight device that is couplable with the superstructure and that comprises a counterweight base plate and at least one connection section extending substantially perpendicular to the counterweight base plate and connected thereto for raising the counterweight device and coupling the counterweight device to the superstructure,
wherein the at least one connection section comprises the following:
a) a placement area via which the counterweight base plate lies on the connection section and introduces the counterweight base plate's weight force at least in the absence of an inclination of the mobile crane;
b) a centering section by section of which the counterweight device can be positioned in an installation position on the superstructure; and
c) a fastening section via which the counterweight device is releasably connectable to the superstructure in the installation position,
wherein the counterweight device comprises at least one placement centering section for positioning the counterweight device on a placement region of the undercarriage, with the placement region having at least one corresponding counter-placement centering section that can be brought into engagement with the placement centering section for a correct positioning of the counterweight device on the undercarriage, with the placement centering section being arranged at a lower side of the counterweight base plate and/or of the at least one connection section.

2 . A mobile crane in accordance with claim 1 , wherein the connection section is formed in one piece.

3 . A mobile crane in accordance with claim 2 , wherein the connection section is configured as a one-piece sheet metal construction having a substantially flat shape.

4 . A mobile crane in accordance with claim 1 , wherein the connection section is fixedly connected to the counterweight base plate.

5 . A mobile crane in accordance with claim 1 , wherein the connection section comprises a base section that is received in a recess of the counterweight base plate; a middle section that projects through an opening of the recess; and a coupling section for coupling with the superstructure, wherein the base section comprises the placement area and has a larger width than the middle section and the opening of the recess.

6 . A mobile crane in accordance with claim 5 , wherein the recess is open toward a lower side of the counterweight base plate and is closed by a cover connectable to the counterweight base plate, with the recess allowing a movement of the base section in the longitudinal direction of the connection section within the recess that is bounded on one side by an attachment of the placement area to a wall of the recess and on the other side by an attachment of the base section at the cover.

7 . A mobile crane in accordance with claim 1 , wherein a ballasting device is provided at the superstructure and is configured to raise and place down the counterweight device.

8 . A mobile crane in accordance with claim 7 , wherein the ballasting device comprises at least one hydraulic ballasting cylinder that can be releasably brought into engagement with a coupling region of the at least one connection section, with the ballasting device furthermore comprising a ballast frame connectable to the superstructure via the fastening section.

9 . A mobile crane in accordance with claim 8 , wherein the coupling region comprises a recess into which a coupling piece of the ballasting cylinder can be traveled by rotating the superstructure about its axis of rotation, with the coupling piece being lockable in the recess.

10 . A mobile crane in accordance with claim 9 , wherein the recess is configured such that the coupling piece of the ballasting cylinder can be positioned within the recess beside the coupling region of the connection section and can be traveled into the coupling region by rotating the superstructure, with the recess having an abutment which the coupling piece abuts in a locking position in which the counterweight device can be lifted by the at least one ballasting cylinder.

11 . A mobile crane in accordance with claim 7 , wherein the superstructure comprises a counter-centering section that is configured to automatically position the counterweight device in an installation position on a raising of the counterweight device by cooperating with the centering section of the connection section, in which installation position the counterweight device is connected to the superstructure, with the centering section comprising a chamfered surface, and/or with the centering section being arranged in the region of the fastening section an end of the connection section disposed opposite the counterweight base plate.

12 . A mobile crane in accordance with claim 7 , wherein the ballasting device is configured to raise and place down the counterweight device from and onto a placement region of the undercarriage, wherein the connection section has a coupling region via which a coupling with the ballasting device can be established at an end of the connection section disposed opposite the counterweight base plate.

13 . A mobile crane in accordance with claim 1 , further comprising at least one counterweight element stackable on the counterweight base plate, said counterweight element having at least one recess through which the at least one connection section projects in a placed down state.

14 . A mobile crane in accordance with claim 1 , wherein the counterweight device comprises at least two mutually spaced apart connection section that are connected to the counterweight base plate and that are arranged at the same distance from the center of gravity of the counterweight base plate.

15 . A mobile crane in accordance with claim 1 , wherein the fastening section comprises a fastening section having a bolt mount to establish a bolt connection with the superstructure, with the superstructure comprising a stabilization metal sheet that is located below the bolt connection in the bolted state and has an opening through which the fastening section of the connection section can be pushed to establish the bolt connection, with the stabilization metal sheet being configured such that the stabilization metal sheet takes up shear forces in the bolted state on an inclination of the mobile crane.

16 . A counterweight device for a mobile crane in accordance with claim 1 , further comprising at least one counterweight element that is stackable on the counterweight base plate.

Assignees

• Liebherr Werk Ehingen

Inventors

• Eberhardt Lars
• Scheffold Peter

Classifications

• B66C23/74 Primary

  separate from jib · CPC title