Handling: hand and hoist-line implements – Grapple – Fixed and moveable jaw
Patent
1987-04-23
1988-11-29
Marbert, James B.
Handling: hand and hoist-line implements
Grapple
Fixed and moveable jaw
B66C 122
Patent
active
047876646
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to means necessary to enable a crane to move (lift, lower, turn over and eventually transport) hollow cylindrical bodies, for instance rolled steel sheets normally called "coils".
As known, it is necessary in industry to move, for instance, rolls of sheet steel, in a safe and practical way, regardless of whether their axis is vertical or horizontal.
Normally these coils are produced and used when their axis is horizontal, while for heat treatment, storage and transport it is preferred to have the coils with their axis in a vertical position.
Devices which can be hung to a crane hook have thus been carried out, capable of rotating the rolled steel sheets (No. DE-B-1.255.887). They foresee a vise which grips a coil from inside and from outside and then rotates driven by an engine which moves on a rack integral with the vise.
It often happens that among the rolled sheets extraneous bodies are trapped such as ice, dust or burrs of the steel sheet itself. When the coil is gripped and rotated, the extraneous body slips away or is compressed, thus reducing the thickness between the jaws; this entails a reduction of the holding force with the danger that the coil slips away from the holding means.
There is also a need to use up to the maximum the height of the stores where the rolls of sheet steel are kept, as well as the useful height of the crane-hooks, which up to now have not been used fully.
The aim of the present invention is thus to overcome these obstacles and produce a device for cranes, of minimum encumbrance, which can lift a hollow cylindrical body having either a horizontal or a vertical axis, providing also for its rotation and for compensation of a possible reduction in the holding force.
The invention will now be better understood by means of exemplary embodiments which are shown in the attached drawings, in which:
FIG. 1 is a side-view of a first embodiment in which the dotted lines show different working positions;
FIG. 2 is a side view rotated 90.degree. with respect to FIG. 1 and partially sectioned along line 2--2 of FIG. 1;
FIG. 3 is an enlarged partially sectioned view showing the actuating means of the clamping and the hydraulic locking system.
FIG. 4 is a view of another embodiment for very tall and narrow coils.
FIG. 5 is a side view of a further embodiment which foresees a load cell;
FIG. 6 is an enlarged view partially in section showing the actuating means of one of the clamp jaw with the relative holding force compensation system which consists of a load cell.
Referring first to FIGS. 1 and 3, it will be noted that R indicates a hollow cylindrical body. This is lifted by the hook of a crane acting along the line X--X of FIG. 1. A pair of levers 10 are connected at one end by a pin 11 which receives the hook. At an intermediate zone the levers 10 have a pivot 12 around which a support 20 can rotate. This support comprises at least three rollers 21. To this set a fourth roller 22 may be added; this roller 22 being smaller than the others in diameter. These rollers are mounted one beside the other, forming two pairs capable of receiving the substantially circular guide 30. The center of the circular guide is comprised in a semi-circumference having as its diametral base the diagonal D of the hollow cylindrical body R. The guide 30 is part of the rotating clamp 31 which comprises a jaw 32 integral with the guide 30, and a moving jaw 33 which can be remotely controlled so as to approach or move away from the jaw 32 integral with the guide 30.
The connection between the pair of levers 10 and the support 20, as said above, is the pivot 12 around which the support 20 can rotate. The support 20 assumes a defined position with respect to the levers 10 by means of two hydraulic cylinders 13 having their pistons linked at the fork-shaped end 14 of lever 10, opposite to the end having the pin 11. The body of the cylinder is connected, through the plate 24, to the support 20. In this way, the more weight bears on the support 20, the more the cylinders 13 tend to close,
REFERENCES:
patent: 2897990 (1959-08-01), Kendall
patent: 3153555 (1964-10-01), Kaplan et al.
Marbert James B.
Trasmec S.A.S. Di Valtorta Italo E C.
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