Mobile crane

Patent metadata

Field	Value
Publication number	US-10647554-B2
Application number	US-201615078635-A
Country	US
Kind code	B2
Filing date	Mar 23, 2016
Priority date	Mar 24, 2015
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

The invention concerns a mobile crane with a drivable undercarriage and a rotatable superstructure mounted thereon, where on the one side there is pivoted a swiveling jib, and on the other side a counterweight arrangement is mounted which is movable relative to the superstructure. According to the invention, the counterweight arrangement has a counterweight base plate, on which at least two stacks of counterweights are arranged and able to swivel about a vertical axis.

First claim

The invention claimed is:

1. A mobile crane with a drivable undercarriage and a rotatable superstructure mounted thereon, wherein on one side of the superstructure there is pivoted a swiveling jib, and on another side of the superstructure a counterweight arrangement is mounted which is movable relative to the superstructure,
wherein the counterweight arrangement has at least one counterweight base plate, on which at least two stacks of counterweights are arranged, each of the at least two stacks of counterweights able to swivel about a corresponding vertical axis, each corresponding vertical axis located at a different position of the mobile crane,
wherein the at least two stacks of counterweights are placed on swivel arms pivoting on a counterweight base plate of the at least one counterweight base plate, wherein the swivel arms swivel continuously from a maximum retracted position to a maximum extended position via swivel drive units,
wherein the counterweight arrangement is coupled to the superstructure via a counterweight frame, and wherein ballasting cylinders are positioned between the at least two stacks of counterweights and the counterweight frame, wherein the at least one counterweight base plate and the swivel arms are removable as a whole from the superstructure as a self-standing transport unit,
wherein the mobile crane is configured for traveling on public roads, and
wherein swivel angles of the swivel arms are detected by sensors.

2. The mobile crane according to claim 1 , wherein the at least one counterweight base plate is joined by the counterweight frame to the superstructure.

3. The mobile crane according to claim 2 , wherein each of two ballasting cylinders includes a center of gravity, and wherein the centers of gravity of the two ballasting cylinders lie in a plane with centers of gravity of each of the at least two stacks of counterweights.

4. The mobile crane according to claim 3 , wherein the ballasting cylinders extend and lift up the counterweight frame.

5. The mobile crane according to claim 1 , wherein counterweight plates which are formed into the at least two stacks of counterweights have an essentially triangular shape.

6. The mobile crane according to claim 1 , wherein four stacks of counterweights are arranged to swivel about four vertical axes, wherein each time two stacks of counterweights arranged alongside each other are pivotable and coupled together.

7. The mobile crane according to claim 1 , wherein the at least one counterweight base plate is also placed already on the counterweight arrangement for transport.

8. The mobile crane according to claim 1 , wherein the at least one counterweight base plate arranged on the swivel arms to receive the counterweights is configured to be taken off and fastened on the mobile crane.

9. The mobile crane according to claim 8 , wherein the at least one counterweight base plate for transport is arranged on a sliding beam box of the undercarriage during the road transport of the mobile crane.

10. The mobile crane according to claim 8 , wherein the at least two stacks of counterweights are adjustable to a different counterweight radius independent of each other.

11. The mobile crane according to claim 1 , wherein the swivel drive units are in the form of hydraulically operated piston and cylinder arrangements.

12. The mobile crane according to claim 1 , wherein a vertical bearing forms the corresponding vertical axis for each of the at least two stacks of counterweights.

13. The mobile crane of claim 12 , wherein each of the at least two stacks of counterweights further include a swivel arm of the swivel arms that pivots about the vertical bearing forming the corresponding vertical axis.

14. A mobile crane with a drivable undercarriage and a rotatable superstructure mounted thereon, wherein on one side of the superstructure there is pivoted a swiveling jib, and on another side of the superstructure a counterweight arrangement is mounted which is movable relative to the superstructure,
wherein the counterweight arrangement has at least one counterweight base plate, a first counterweight base plate having a first stack of counterweights and a second stack of counterweights arranged thereon,
wherein the first stack of counterweights and the second stack of counterweights each have a center of gravity,
wherein the first stack of counterweights and the second stack of counterweights are able to swivel about a corresponding vertical axis, each corresponding vertical axis located at a different position of the mobile crane,
wherein the at least one counterweight base plate is joined by a counterweight frame to the superstructure,
wherein a first ballasting cylinder and a second ballasting cylinder each include a center of gravity, and
wherein the center of gravity for each of the first ballasting cylinder, the second ballasting cylinder, the first stack of counterweights, and the second stack of counterweights lies in a plane.

15. The mobile crane of claim 14 , wherein the center of gravity for each of the first ballasting cylinder, the second ballasting cylinder, the first stack of counterweights, and the second stack of counterweights results in four total centers of gravity that lie in the plane.

Assignees

• Liebherr Werk Ehingen

Inventors

• Oelberger Franz
• Richter Yggve
• Bitz Markus
• Koenig Heinz

Classifications

• B66C23/36

  mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes (with pneumatic or hydraulic motors B66C23/54; vehicle or ship aspects B60 - B63) · CPC title

• B66C23/76 Primary

  and movable to take account of variations of load or of variations of length of jib · CPC title