NO791086L - LIFTING TOOL FOR RING-OBJECTED OBJECTS - Google Patents

Description

IN

Lifting tool for ring-shaped objects.

The invention relates to a lifting device for ring-shaped objects, preferably well rings, where the lifting device consists of at least one U-shaped hoop, with a swingable locking arm arranged on one of the hoop branches, which can be swung with its one end into the hoop for holding the object in this, and which is connected at its opposite end with a lifting line, and where the middle part of the hoop is provided with a lifting loop.

Lifting devices of this type are excellent aids when lifting ring-shaped objects, for example heavy well rings. The hoop is then placed with its two branches on either side of an edge part of the well ring. The lifting rope is attached to the outer end of the boom to a hydraulic lifting crane, excavator, etc. and when the lifting rope is pulled, the locking arm is swung to clamp the aforementioned edge part between the locking arm and one branch of the hoop. The well ring can then be lifted using the lifting crane, the digging machine etc. IN

There are, however, certain disadvantages associated with previously known lifting devices of this type. As the lifting rope is attached to the locking arm and thus to one branch of the hoop, the hoop will not come straight when lowered towards the well ring, i.e. with the branches directed vertically. For placing the hoop around the well ring edge, you have therefore been forced to lift or turn the hoop into the correct position. This is both time- and labor-intensive, as the bdylén

is relatively heavy. A standard size hoop weighs approx. 5(j kg. In this context, it should be pointed out that such a lifting device normally includes two hoops.

Moreover, it is difficult to detach the hoop from the ring. Mon

cannot use the lifting rope to lift the hoop from the ring,<3>as the locking arm is then tensioned again instead. You are therefore forced to lift the heavy brace off by hand. When constructing deep wells, where a large number are to be placed

well rings on top of each other, this situation is particularly difficult, because a worker, who has gone down into the well to lift the hoops free from the rings, does not always reach up, but has to stand on a ladder in the well.

These disadvantages are eliminated by the lifting device according to the invention, which is characterized by the fact that a lifting strap, which extends from the lifting rope, can be attached to the lifting loop, and that the length of the lifting strap is so much shorter than the length of the lifting rope that the part of the lifting rope which extends between the attachment point for the lifting strap on the lifting line and the locking arm is slack when the hoop hangs in the lifting strap.

The invention is described in more detail below with reference to an exemplary embodiment, which is shown in the drawings.

Fig. 1 is a side view of a hoop, which forms part of a lifting device according to the invention. Fig. 2 illustrates on a smaller scale how the lifting device is placed on a well ring by means of an excavator, as fig. 3 is a corresponding drawing, which shows the well ring hanging in the lifting member.

The hoop, which. denoted by 1, has two branches 2 and 3. A locking arm 4 is pivotably arranged on one branch 2. One end 5 of the locking arm 4 can be pivoted into the hoop 1 for holding an object between it and the hoop branch 3. The opposite end 6 of the locking arm 4 is connected to the lifting line 7. The line 7 runs through a control loop 8, which is connected to the hoop branch 2.

A fastening ear 9 is formed in the middle of the hoop, which serves as a lifting loop. A lifting strap 10 is attached to the lifting loop 9

using a hook 11.

In fig. 1 shows the locking arm 4 in the locking position for holding an object 12, which is indicated by dashed lines, between the locking arm 4 and a plate 13 on the branch 3. The locking arm 4 is designed on its engaging side with teeth 14 to increase the friction against the object 12*Plate 13 is for the same reason provided with rifles or grooves.

Fig. 2 shows a lifting device with two hoops in the position just before it is placed on a well ring 15. As can be seen from the figure, the respective hoop 1 then hangs in its own lifting strap 10, which is connected to the respective lifting line 7. The connection or attachment point is designated with 16. When the hoops 1 hang in the respective lifting strap 10, the line part 17 between the attachment point 16 and the locking arm is slack, and the hoop branches 2,3 are mostly vertical. As fig. 2 shows, the two lifting lines 7 at 18 are connected with a common lifting line 19. The lifting device can be lowered towards the ring 15 with the help of a hydraulically driven excavator 20, lifting crane etc. Due to the fact that the weight of the respective hoop is absorbed by the lifting strap 10, it easy to place the hoops manually on the well ring 15 with the branches 2,3 of the respective hoop 1 on either side of a ring edge section. When the lifting device is placed in position on the well ring, the hook 11 on the respective lifting strap 10 is hooked out of the lifting loop 9.

When pulling in the lifting line 19 and thus in the lifting lines 7, the locking arm 4 is swung on the respective hoop to clamp the ring edge part between the locking arm 4 and the hoop branch 3.

By continuing to pull the lifting line 19, the well ring 15 is lifted.

In fig. 3 shows the lifting device during lifting of the well ring.

As soon as the well ring 15 has been set down on the ground, the hoops 1 - after hooking the hook 11 of the respective lifting strap 10 in the lifting loop 9 on the respective hoop - can be easily lifted off the well ring.

The invention is not limited to the embodiment shown and described, but can be modified within the scope of subsequent patent claims. For example, one could imagine using a lifting device with more than two hoops, which hang from each end of the lifting rope on the lifting rope. In this case too, the lifting device is provided with a lifting strap for each hoop.

The lifting device can also consist of a single hoop. In this case, the ring-shaped objects are not horizontal during lifting, as the hoop and thus the object swings due to the attachment of the lifting pawl to the branch 2.

Lifting device for ring-shaped objects (12,15), preferably well rings, where the lifting device consists of at least one U-shaped hoop (1), with on one hoop branch (2)

a pivotable locking arm (4) is arranged, which with its one end (5) can be swung into the hoop for holding the object in it, and which is connected at its opposite end (6) to a lifting line (7), and where the hoop's (1) the middle part is provided with a lifting loop (9)" characterized in that a lifting strap (10), which extends from the lifting line (7), can be attached to the lifting loop (9), and that the length of the lifting strap (10) is much shorter than lifting line (7). length that the lifting line part that extends between the attachment point (16) for the lifting strap on the lifting line and the locking arm (4) is slack when the hoop (1) hangs in the lifting strap (10).