Tower crane with collapsible counter-jib
AssigneePotain
InventorJean-Claude Saint-Gerand
Life of this patent
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Abstract
The auto-erection tower crane possesses a tie-free jib, mounted at the summit of a mast and extended, toward the rear of its connection point to the summit of the mast, by a counter-jib, the end of which is connected, by a rear tie, to a bogie truck element of the crane. For the transport of the crane, the counter-jib is folded up in a vertical plane on the rear part of the jib. The unfolding and folding-up of the counter-jib are realized automatically, simultaneously with the automatic erection or dismantling of the crane. The structure of the counter-jib also allows adjustment of the working position, horizontal or inclined, of the jib.
Claims11
An auto-erecting tower crane, comprising:
- a bogie truck;
- a mast having a base and a summit, wherein the base is connected to the bogie truck;
- a jib having a rear end and connected to the mast summit;
- and
- a counter-jib having anterior and posterior ends with no tie or cable connecting the counter-jib posterior end to a middle or a far end of the jib, wherein the counter-jib anterior end is articulately connected to the jib rear end, wherein the counter-jib has a folded orientation positioning the counter-jib posterior end near the jib and at least one unfolded orientation positioning the counter-jib posterior end away from the jib, and wherein the counter-jib traverses a vertical plane when moved between the folded and unfolded orientations.
An auto-erecting tower crane, comprising:
- a bogie truck;
- a mast having a base and a summit, wherein the base is connected to the bogie truck;
- a jib having a rear end and connected to the mast summit;
- a counter-jib having anterior and posterior ends with no tie or cable connecting the counter-jib posterior end to a middle or a far end of the jib, wherein the counter-jib anterior end is articulately connected to the jib rear end, wherein the counter-jib has a folded orientation positioning the counter-jib posterior end near the jib and at least one unfolded orientation positioning the counter-jib posterior end away from the jib, and wherein the counter-jib traverses a vertical plane when moved between the folded and unfolded orientations;
- and
- a motorized device for controlling at least part of the movement of the counter-jib between the folded and unfold orientations, the motorized device being mounted at the rear end of the jib.
An auto-erecting tower crane, comprising:
- a bogie truck;
- a mast having a base and a summit, wherein the base is connected to the bogie truck;
- a jib having a rear end and connected to the mast summit;
- a counter-jib having anterior and posterior ends with no tie or cable connecting the counter-jib posterior end to a middle or a far end of the jib, wherein the counter-jib anterior end is articulately connected to the jib rear end, wherein the counter-jib has a folded orientation positioning the counter-jib posterior end near the jib and at least one unfolded orientation positioning the counter-jib posterior end away from the jib, and wherein the counter-jib traverses a vertical plane when moved between the folded and unfolded orientations;
- and
- a motorized device for controlling at least part of the movement of the counter-jib between the folded and unfold orientations, the motorized device being mounted at the rear end of the jib, wherein the motorized device comprises a gas spring and a connecting rod assembly, wherein the gas spring articulately connects the jib to a three-point connecting rod, wherein the connecting rod articulately connects the jib to a linkage, and wherein the linkage articulately connects the connecting rod to the lower part of the counter-jib.
Dependencies are inferred from the claim text.