Device for demountable assembly of the jib elements of a tower crane
AssigneePotain
InventorMichel Lissandre
Life of this patent
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Abstract
The invention is concerned with the demountable assembly of latticework jib elements comprising upper and lower chords connected to one another by means of triangulation bars. In the region of the upper chords, there is provided an assembly by shackle, tenon and a connecting shaft, with abutment and relative positioning means. In the region of the lower chords, there are provided centering pegs and a locking assembly consisting of two connections spaced apart and having clamping and locking means. This device is used for assembling the jib elements and counterjib elements of tower cranes, in particular those having a jib without a masthead and without a tie.
Claims22
A device for assembly of latticework jib elements of a latticework structure, each of the jib elements including upper chords and lower chords connected to one another by triangulation bars, the device comprising:
- an upper connection including:
- a connecting shaft;
- a shackle configured to mount to an upper chord end of a first jib element of the jib elements to be assembled, the shackle including two parallel branches oriented in vertical planes, and each of the two branches including a main coaxial cylindrical hole with a diameter corresponding to a diameter of the connecting shaft,
- a tenon configured to mount to an upper chord end of a second jib element of the jib elements to be assembled, the tenon being oriented in a vertical plane and including an oblong hole,
- the connecting shaft being configured to be engaged through the main coaxial cylindrical holes of the shackle and through the oblong hole of the tenon to detachably connect the shackle and the tenon, and
- each of the shackle and the tenon including complementary abutment means acting in a substantially vertical direction during assembly and complementary abutment means acting in a substantially horizontal direction during assembly to position the shackle and the tenon.
Dependencies are inferred from the claim text.