US2014544A - Crane - Google Patents

Description

Patented Sept. 17, 1935 PATENT OFFICE cam Paul Wilsing, Duisburg, Germany,

assignor to Demag Aktiengesellschaft, Duisburg. Germany Application November 18, 1932,'Serial No. 643,218 4 In Germany November 26, 1931 2 Claims. (01. 21269) The invention relates to a lufling crane having a fixed column and a bell casing rotatable about the column. According to theinvention a platform having the operator's stand and the driv- 5 ing mechanism mounted thereon is carried at the upper end of the rotatable bell casing, the jib being mounted at the lower end directly thereon upon thesaid casing; the operator thus has a wide view and can supervise the driving mechanism, which is close beside him. The fixed column does not need to be any higherthan the bell casing, and the driving mechanism is disposed at a height above the ground or'supporting surface, a V fact which is of importance in. connection with,

lufling cranes mounted on ships. The crane according to the invention is simple and effective in operation and needs only a single operator.

- Moreover, in the construction of crane according to the invention the platform with the important driving and operating elements is disposed at the top end of the column and the advantage is secured that the crane operator can see from his platform right to the bottom of the ship's hold and can keep his eye on the loading operations proceeding there. The cranes are adapted to be mounted near to the edges oi! the hatchway. I

In theusual constructions the crane operator frequently has his view obscured by structures on the ship or by work people and whereas in the 0 hitherto known features of ship's crane the operator of the crane can see only close against the edges of the hatchway, he can now see well below it and is positioned above the other work people 1 so that he can see over them.

Again, the extension of the ship's crane rearwardly does not affect other ship structures or 'work people sothat thus the crane can turn without hindrance and without the fear being pres: cut that persons may get-injured or goods damaged. The cranes are therefore specially suitable tor ships.

The invention is illustrated,- by way of exam 'ple, in the accompanying diagrammatic drawing.

Figure 1 is a side elevation of a Iufling crane according to the invention.

5 Figure 2 is a corresponding plan, and

. Figure 3 is a vertical section through the 'plat-' form, on an enlarged scale.

As will be seen by reference to the drawing, a sleeve 2 is in the form of a bell inverted over the fixed column I, the sleeve 2 being suitably held at a distance from the column I at the upper and lower ends. The platform 2, which comprises a central part 3a and an outer part .31), is mounted i atthe upperendoithesleeve 2 (P1811183). The

luiiing jib 5 is pivotally connected at 4 to the sleeve 2; the mechanism for efiecting rotation'is provided, as is the platform 3, at the-upper end ofthe column I. The platform 3a serves as a housing for the said mechanism; the motor 6 of the r said mechanism is secured by a flange directly to the platform 3aand operates through a combined coupling and braking combination I. The

toothed wheel transmission 8 acts on a toothed wheel 9 which is keyed at the upper end of the 10 column I and is therefore stationary. Above this stationary toothed wheel of the mechanism for efiecting rotation there are provided the slip rings In for supplying current to the driving motors. The hoisting mechanism and the lufling mechanism which are'both provided with drums, are combined in a driving set in a particular manner, that is to say, the two drums are disposed co-axially as shown in Figure 2. The hoisting motor ll operates the hoisting drum i3v through gearing which is provided in the gear casing l2. The hoisting cable 14 passes from the drum l3 to the pulley l5 at the end of the jib, thence to the return pulley I 6 and back to the jib pulley' II, from whichpoint it hangs in a vertical line weighted by the loadhook l8. The drum IQ of the drawing in or luiiing gear is driven by the lufling motor through gearing provided the casing 2|. The lufling gear and the arrangement and disposition of the parts of the crane are such that in luifing the load follows a horizontal path. The drums l3 and I 9, as also the return pulley ii, are mounted upon a common shaft which is situated between the two casings I 2 and 2|, the drums l3 and is being driven through their respective gears. This common shaft may, for example, be fixed and the two drums. will then be driven by an internally-toothed pinion.

Y To render the shaftbearings accessible and capa ble of being dismantled a multipartite ring 22 is provided between the two drums and if the parts of this ring be removed radially the drums can slide along so that the axle bearings are exposed. The lufling cable .23, coming from the drum [9, is guided over the pulley 24 and back to any suitable point 25 in the casing l2.

The outerpart'of the platform may serve for the reception of control members in the same way as the central part 30 of the platform is formed as gear casing. The platformis for this purpose in the form of acasing and may be divided up into a number of chambers, these chambers containing the controllers 26, 21 and 28 as well as the resistances 29. In the present case the crane operates with a to and fro switch mech- 5 pivoted to sold rototable column, a. plottom upon belnclufledJufllmmeehmimeomprlslng 'forzmdlnctheloedlnahorhontelpothand theroiateble oolumnabove the pivotal exls ot thehmnzjlbprovldedatthefo'rwnrdsldevlth nreoesslntowhlchthejlbmybeteoelvedwhen moon:

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