GB2027671A

GB2027671A - Lifting Tackle for Drums

Info

Publication number: GB2027671A
Application number: GB7926903A
Authority: GB
Original assignee: Spanset Inter AG
Current assignee: Spanset Inter AG
Priority date: 1978-08-04
Filing date: 1979-08-02
Publication date: 1980-02-27
Also published as: AU4941279A; DE7823411U1; NL7905862A; NO792533L; SE7906568L; BE878066A; FR2432470B3; ES245002Y; ES245002U; FR2432470A1; IT7922282V0

Abstract

A lifting tackle for, e.g. cable drums comprises a pair of Z-shaped claws (2) insertable in and lockable relative to end holes (12) in the drum and connected to a lifting ring (4) via ropes (3). <IMAGE>

Description

SPECIFICATION Lifting Tackle for Drums The present invention relates to a lifting tackle for drums having axial apertures in their ends such as cable drums which have a central hole.

The procedure for lifting such objects has long since been to pass a rod through the central hole in the drum, whereupon the two ends of the rod are connected to a crane hook via supporting ropes. This procedure is not only burdensome, because an appropriate rod of sufficient carrying capacity must be available, but is also hazardous.

It can easily happen that the supporting ropes become detached from the ends of the rod so that the drum falls. Furthermore, there is the risk of the drum rotating about the axis of the rod as it is lifted until it has swung over so that its centre of gravity is directly below the rod.

According to the present invention, there is provided a lifting tackle for drums with axial apertures in their ends, the lifting tackle comprising two clamping claws insertable into and lockable in the apertures in the drum and connected via supporting elements to a lifting ring.

The clamping claws may be in Z-shaped hooks each with a carrier bar, a middle bar and a clamping bar, of which the carrier bar is connected to the supporting element which may be a rope, chain or belt etc.

In a preferred embodiment of the innovation, the middle bar forms an angle of 900 to 1100 with the carrier bar and an angle of 700 to 900 with the clamping bar. The clamping bar is preferably shorter than the carrier bar. To increase the stability, the carrier bar may be extended beyond the point at which the middle bar branches off, in order to form a heel. Furthermore, it has been found to be advantageous for the clamping claws to have a rectangular cross section since this makes a larger area of surface available for application to the side members of the drum and to prevent the drum turning while it is being raised and so being able to swing into the position of the centre of gravity.

In order to be able to lift drums of vastiy differing size with one and the same lifting tackle, it is possible for the clamping claws to be interchangeably secured to the supporting elements.

The invention will be further described with reference to the accompanying drawings, in which: Fig. 1 is a side view of one embodiment of lifting tackle according to this invention in its position of rest; and Fig. 2 is a side view of the lifting tackle of Figure 1 in its working position.

The lifting tackle generally designated 1 consists in essence of clamping claws 2 which are connected via supporting ropes 3 to a crane ring 4. The clamping claws may be connected to the supporting ropes for instance via shackles 5 shown in the drawing, but also by any other suitable means. The shackles 5 have the advantage that the clamping claws are easily interchangeable and can therefore be repiaced by others of a different size when necessary.

The supporting ropes 3 are, in the example illustrated, constructed as loops which are held together over a-portion of their length by tube-like sheaths 6. Naturally, it is however also possible to use other supporting ropes such as, for example, supporting belts, single ropes or the like.

In the illustrated embodiment the supporting .ropes 3 are connected to the crane ring 4 via shackles 7. Naturally, this connection may also be otherwise made, for example by looping.

The clamping claws 2 consist in each case of Z-shaped hooks with a carrier bar 8, a middle bar 9 and a clamping bar 10. In the example illustrated, the carrier bar 8 is connected to the supporting rope 3 by the aforementioned shackles 5.

To fit such a lifting tackle onto a drum 1 in the central hole 12 thereof, it is necessary only to introduce the clamping claws 2 into the central hole 12 in the manner shown in Fig. 2. During lifting, the throat 1 3 of each clamping claw abuts the outer edge of the central hole, with the result that the middle bar 9 is pressed downwards and therefore the clamping bar 10 is positively forced into the clamping position shown in Fig. 2. In consequence, the weight of the drum 11 ensures that the heavier the drum is, the more rigidly the clamping claw is locked in the central hole.

It is particularly suitable for the middle bar 9 to form with the carrier bar 8 an angle of 90 to 1100 and with the clamping bar 10, an angle of 70 to 900. These proportions are also shown in Fig. 2 and it can be seen that they represent an optimum contribution to assisting the clamping effect.

Furthermore, the clamping bar 10 may be shorter than the carrier bar 8. This ensures that the clamping claw 2 can also be introduced into central holes which are relatively narrow. The exact size of the entire clamping claw and also of the individual bars will naturaily be governed by the particular application.

The drawings show that the carrier bar 8 of the clamping claws is extended beyond the branching point 14 of the middle bar 9 in order to form a heel 1 5. This extension serves on the one hand to increase stability; on the other hand it also provides a depression on the underside of the middle bar 9, capable of accomodating the edge of the wall 16 of the drum 1 1. As a result, a particularly reliable seating of the clamping claw is achieved and this is significant particularly in the case of heavy drums.

In order to prevent the lifted drum rotating about its axis of rotation, the clamping claws 2 may be of rectangular cross-section. In this case, they have a particularly large-area contact with the corresponding points at which they touch the drum and have a braking effect on the drum if the centre of gravity is not already at the lowest point of the raised load.

Claims

1. A lifting tackle for drums with axial apertures in their ends, the lifting tackle comprising two clamping claws insertable into and lockable in the apertures in the drum and connected via supporting elements to a lifting ring.

2. A lifting tackle according to claim 1, wherein the clamping claws are each Z-shaped hooks with a carrier bar, a middle bar and a clamping bar, the carrier bar being connected to the associated supporting-element.

3. A lifting tackle according to claim 2, wherein the middle bar forms an angle of 900 to 1100 with the carrier bar and an angle of 700 to 900 with the clamping bar.

4. A lifting tackle according to claim 2 or 3, wherein the clamping bar is shorter than the carrier bar.

5. A lifting tackle according to any one of claims 2 to 4, wherein the carrier bar extends beyond its junction with the middle bar in order to form a heel.

6. A lifting tackle according to any one of the preceding claims, wherein the clamping claws are of rectangular cross-section.

7. A lifting tackle according to any one of the preceding claims, wherein the clamping claws are interchangeably attached to the supporting elemens,