Foldable machine for handling and lifting loads
AssigneePotain (Societe Anonyme)
InventorJean C. Saint Gerand
Life of this patent
Estimating the term…
Abstract
The machine comprises, above a rotating frame, a mast which is foldable into two elements, a jib pivoted at the top of mast and a jib head member for the placing of loads, pivoted at the end of the jib. Straightening and holding in working position is assured by a unit comprising at least one counterbrace, a tie connected to a foot of the jib head member, a set of posts, a back holding cable, and a first double-acting jack associated with a system of connecting rods pivoted on the mast elements. Another double-acting jack connects the jib to the foot of the jib head member to make the machine work at different radii. The machine can be used for holding, lifting and placing loads on small-building construction sites.
Claims8
A foldable machine for handling and lifting loads, including a mast foldable between at least two elements, a jib pivoted at a top portion of the mast, equipped with at least one counterbrace for straightening and holding the mast in the raised working position and a unit for holding the jib consisting of a tie, at least one post and a back holding cable connected to the back part of a rotating frame comprising, in combination:
- (a) a first double-acting jack connected at one end to a lower mast element and at another end to a common joint of a system of connecting rods, the system of connecting rods having ends which are pivoted respectively on the base of an upper mast element and on the top of the lower mast element;
- (b) a jib head member pivoted at a pivot point on one end of the jib, carrying means for suspension of a load and comprising, beyond the pivot pin on the jib, a foot having a connection with the tie of the holding unit;
- and
- (c) a second double-acting jack connecting the jib to a joint located on the foot of the jib head member and acting as a lever support point for the jib head member, and
- wherein connection between the foot of the jib head member and the tie of the holding unit consists of a connecting rod pivoted at a pivot point on the foot of the jib head member and connected to the tie, and a third jack pivoted at a pivot point on the foot of the jib head member and resting on a joint carried by the connecting rod.
Dependencies are inferred from the claim text.