Raised counterweight for a mining machine
US-2016230368-A1 · Aug 11, 2016 · US
Crane with adjustable suspended ballast
US11577941B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11577941-B2 |
| Application number | US-202016909285-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 23, 2020 |
| Priority date | Jun 26, 2019 |
| Publication date | Feb 14, 2023 |
| Grant date | Feb 14, 2023 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
The present invention relates to a crane comprising a main boom and a rearwardly directed derrick boom for bracing the main boom, wherein a suspended ballast is directly or indirectly attached to the derrick head via connecting means, wherein at least one luffable, rearwardly aligned ballast adjusting boom is provided, which acts on the connecting means and influences the suspended ballast radius by its luffing angle.
First claim
Opening claim text (preview).
The invention claimed is: 1. A crane, comprising a main boom, a rearwardly directed derrick boom for bracing the main boom, a suspended ballast is directly or indirectly attached to a derrick head, connecting means attaching the suspended ballast to the derrick head, and a luffable, rearwardly aligned ballast adjusting boom directly coupled to the connecting means at a point between the derrick head and the suspended ballast, and which acts on the connecting means and influences a suspended ballast radius by a luffing angle thereof, wherein said connecting means comprise a first strand connecting a head of the ballast adjusting boom to the derrick head, and a second strand connecting the suspended ballast to the head of the ballast adjusting boom, and the connecting means comprise a first pulley block connecting the head of the ballast adjusting boom to the derrick head and a second pulley block connecting the suspended ballast to the head of the ballast adjusting boom. 2. The crane according to claim 1 , wherein the change of the luffing angle is effected by a change in distance between the derrick head and a ballast adjusting boom head. 3. The crane according to claim 1 , wherein an erection cylinder acting independently of the connecting means is provided for the luffing actuation of at least one of the ballast adjusting boom and the derrick boom. 4. The crane according to claim 1 , wherein an articulation point of the ballast adjusting boom is located close to a slewing ring of an upper carriage.
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Frequently asked questions
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- What does patent US11577941B2 cover?
- The present invention relates to a crane comprising a main boom and a rearwardly directed derrick boom for bracing the main boom, wherein a suspended ballast is directly or indirectly attached to the derrick head via connecting means, wherein at least one luffable, rearwardly aligned ballast adjusting boom is provided, which acts on the connecting means and influences the suspended ballast radi…
- Who is the assignee on this patent?
- Liebherr Werk Ehingen
- What technology area does this patent fall under?
- Primary CPC classification B66C23/76. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Feb 14 2023 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).