DE1224898B - Jib crane - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

B 66 c

German KL: 35 b - 3/18

Number:
File number:
Registration date:
Display day:

T 24311XI / 35 b

July 17, 1963

September 15, 1966

The invention relates to a jib crane with Jnein winch having at least one Wickeltromifteel ,, the jib is movably mounted to execute a Einziehlitad / or pivoting movement, km outer end of the boom head rollers carries a Lastlcagseü and in the region of the outer end has a on both sides above the cross carrier, on whose two at a distance from the boom located Baden two guide rollers are arranged, with 4as the load rope, which asks a roller block with load hook ίο and whose ends are wound in the same direction on the rocking drum, from this over the ÄMüslegerkopfollen down and around the roller Malben and then with its strands striving apart upwards over the guide rollers befktdlichen on the cross member is guided in such a way that the roller block hangs on converging cable strands. In such a known crane there are; the cross member protruding on both sides and the guide rollers arranged thereon essentially in a plane passing through the boom. The load carrying rope runs both from the head roller and from the guide roller directly to a roller arrangement located above the winding drum, from which it is returned several times to further rollers on the cross member and to this roller arrangement before its ends run to the winding drum.

With the known crane, it is true that when one is in an approximately horizontal position Cantilever Pendulum oscillations of the load also in a vertical plane passing through the boom be dampened, but this beneficial effect is greatly reduced when the boom is raised, because then because of the approximately lowering Cantilever head rollers located right above the guide rollers have the stabilizing effect from above diverging strands of rope in the above-mentioned level are missing.

Due to the rope guidance of the known crane, the crossbeam is also particularly prone to bending stressed and must be dimensioned accordingly stronger.

Another known crane has one at the top of the boom about a horizontal axis pivotable, essentially triangular rocker arm whose pivot axis is in the Near one of its corners. One end of the load carrying rope is at a front corner of this rocker arm attached, that from there down to the roller block, then up to one in the middle area of the luffing arm arranged guide roller

Applicant:

John Stevenson Thomson,

Greenock (UK)

Representative:

Dipl.-Ing. A. Wedde, patent attorney,

Munich 27, Schurnarmstr. 2

Named as inventor:
John Stevenson Thomson,
Greenock (UK)

Claimed priority:

Great Britain July 18, 1962 (27 534)

runs, from here back to the roller block and then to a roller arranged at the third corner the winding drum located in the Wippann is guided.

Apart from the complex construction of the known crane with the additional luffing arm and the difficulties that arise from the arrangement of the winch in the rocker arm, this is Construction is unfavorable, as the wide front of the rocker arm during loading work under limited space is a hindrance and because of the asymmetrical loading of the load carrying rope must be trained more.

The invention has set itself the task of avoiding the disadvantages of the known embodiment to create a crane that avoids load swings as far as possible in all operating positions and can achieve an easy and cheap training of the boom and the cross member.

Starting from a crane of the type mentioned at the outset, this is achieved according to the invention by that the load carrying rope as a closed loop from the roller block along the one guide roller the cross member is looped to the other guide roller and back to the roller block and that the the cross member carrying the guide rollers is arranged at a distance above the boom.

609 660/100

i 224 898

In the drawing, an embodiment of a crane designed according to the invention is shown in perspective View shown.

The jib crane shown, which is particularly suitable for use on a ship deck is, has two vertical columns 10, which are connected at their upper ends by a cross member 11 are. In the middle of this traverse 11, two rope pulleys 12 for a load carrying rope 21 are mounted. Below these pulleys 12 are a winch 13 with at least one winding drum 22 and a Pivot bearing 14 on which a boom 15 is mounted such that it retracts and pivots can perform.

The boom 15 carries at its front end a boom head roller assembly 16, which from consists of two rope pulleys arranged next to one another and one behind the other. From the boom head roller assembly 16 slightly set back, a cross member 17 is arranged above the boom 15, which consists of two struts 18 converging obliquely outwards and upwards from the boom 15, the upper ends of which are connected to a transverse strut representing the cross member 17 are. At the two upper and outer ends of this cross member 17 are guide rollers 19 for the Load carrying rope 21 stored.

The load carrying rope 21, which carries a roller block 20 with load hook, is designed as a closed loop, whose center piece lies along the cross member 17 between the guide rollers 19 and the from here in two rope strands 21 'to the roller block 20, from where the two rope strands 21 "over the boom head pulley assembly 16 to the pulleys 12 and then to the Winding drums 22 are performed, to which the rope ends are attached.

The roller block 20 thus hangs on the upwardly diverging cable strands 21 'and 21 ″, which run to the boom head roller arrangement 16 or to the guide rollers 19.

For lifting heavy loads, the winding drum 22 can also be designed in two parts, one end of the rope being wound onto a winding drum 22 in each case. In this case, these winding drums 22 can be optionally driven so that only one winding drum 22 is ever in operation, whereby the lifting speed can be reduced and the lifting capacity can be increased.
Since the roller block 20 hangs on converging cable strands 21 'and 21 ", pendulum oscillations of the load are automatically damped when the boom 15 is moved from one position to another and then stopped because the roller block 20 tries to return to its stable position.

Claims (1)

Claim: Jib crane with a winch with at least one winding drum, the jib for Execution of a retraction and / or pivoting movement is movably mounted on the outer End of jib head rollers for a load carrying rope and one in the area of the outer end has cross members protruding on both sides, on the two of which are located at a distance from the boom Ends of two guide rollers are arranged, the load-bearing rope, which is a roller block with load hook and the ends are wound in the same direction on the winding drum are, from this over the cantilever head rollers down and around the roller block and then striving apart with its strands upwards over the ones on the cross member Guide rollers is guided in such a way that the roller block on converging rope strands hangs, characterized in that the load carrying rope (21) as a closed Loop from the roller block (20) over a guide roller (19) along the cross member (17) is looped to the other guide roller (19) and back to the roller block (20) and that the the cross members (17) carrying the guide rollers (19) are arranged at a distance above the boom (15) is. Considered publications:
German Patent No. 939 491;
German exploratory documents No. 1020 544,
1043129; U.S. Patent No. 2,933,197. 1 sheet of drawings 609 660/100 9.66 © Bundesdruckerei Berlin