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1. (WO2010080023) LIFTING TOOL FOR LIFTING A STACK OF CONCRETE REINFORCING MATS AND PLACING THE CONCRETE REINFORCING MATS ONE BY ONE, AND UNLOADING UNIT AS PART OF THE LIFTING TOOL
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CLAIMS

1. Lifting tool for lifting a stack of concrete reinforcing mats and placing the concrete reinforcing mats one by one, which can be operated by one person from one central location, wherein the lifting tool comprises a stable main frame which is constructed from tubular profile and which is provided with a number of, for instance four, lifting eyes and a number of, for instance six, independent unloading units slidable in the length, characterized in that each unloading unit (20) is provided with a first set of jaws of two inner jaws (4), (29) intended to engage the lowest or the lowest but one concrete reinforcing mat, and a second set of jaws of four outer jaws (1), (2), (3), (26) intended to engage the lowest concrete reinforcing mat, wherein the underside of the first set of jaws is situated above the underside of the second set of jaws, and each set of jaws is adapted to perform a scissor movement between an open and closed positron, and the first set of jaws and second set of jaws co-act by means of a lever construction (7), (8), (11), (17), (18), (19), (20) and are coupled to each other via a bellows cylinder (14) such that in the loading position of the lifting tool the unloading unit is pressed through the transverse rods of the successive concrete reinforcing mats, wherein the second set of jaws is situated in an open position and the first set of jaws opens as it passes over each transverse rod and, after passing over each transverse rod, closes due to its own weight, that in the lifting position of the lifting tool the first set of jaws closes under the lowest reinforcing mat due to the weight of the stack of reinforcing mats, upon first operation of the lifting tool the second set of jaws closes and the first set of jaws opens such that the lowest reinforcing mat drops out of the first set of jaws into the second set of jaws, and upon second operation of the lifting tool the first set of jaws closes and the second set of jaws opens such that the lowest reinforcing mat drops out of the unloading unit.

2. Lifting tool as claimed in claim 1, characterized in that the first and second set of jaws are provided with a shared pivot point (9).

3. Lifting tool as claimed in claims 1 and 2, characterized in that the second set of jaws is connected by means of draw springs (27), (28) to the lever construction (17), (18) such that in the loading position of the lifting tool the second set of jaws opens.

4. Lifting tool as claimed in claim 1 , 2 and 3, characterized in that the stroke of the second set of jaws is adjustable by means of an arresting pin (25) which co-acts with stroke limiting profiles (22), (23).

5. Lifting tool as claimed in any of the foregoing claims, characterized in that each inner jaw (4), (29) and each outer jaw (1), (2), (3), (26) are provided on the inner side of the lower part thereof with a triangular protrusion.

6. Lifting tool as claimed in any of the foregoing claims, characterized in that the lifting tool can be operated electrically, hydraulically or pneumatically.

7. Unloading unit as described as part of the lifting tool as claimed in any of the foregoing claims.