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US 8,127,951 B2Granted
Telescopic crane boom
AssigneeTerex Demag GmbH
InventorsFrank Conrad, Jürgen Appel
Life of this patent
Estimating the term…
Abstract
A telescopic crane boom including a plurality of telescopically assembled tubular box sections including a base box section and an innermost box section having an open cross-section, and a boom head with a frame fixed to the outside circumference of the innermost box section. The head has a plurality of deflecting pulleys mounted on the frame, but no part extending inside the open cross section on the innermost base box section, whereby at least one additional box section can be inserted into the innermost box section in order to extend the boom.
Claims14
A telescopic crane boom comprising:
- a plurality of telescopically assembled tubular box sections including a base box section and an intermediate box section having an outside circumference and an open cross-section;
- a first boom head comprising a frame fixed to the outside circumference of the intermediate box section, the head having a plurality of deflecting pulleys mounted on the frame, the head having no part extending inside the open cross section on the innermost box section;
- and
- a first box section telescopically disposed in the intermediate box section in a first position and telescopically extending from the intermediate box section in a second position in order to extend the boom.
1 more element
Dependencies are inferred from the claim text.