GB2189203A

GB2189203A - Mobile jib crane

Info

Publication number: GB2189203A
Application number: GB08708489A
Authority: GB
Inventors: Herbert Eichler
Original assignee: MAN Takraf Fordertechnik GmbH
Current assignee: Takraf GmbH
Priority date: 1986-04-17
Filing date: 1987-04-09
Publication date: 1987-10-21
Also published as: DD268352A3; GB8708489D0; DE3710414A1; GB2189203B

Description

GB2189203A 1

SPECIFICATION support taken along the line A-A indicated in

Fig. 2, and Mobile jib crane Figure 4 is a section through the bearing construction taken along the line B-B indicated This invention relates to a mobile jib crane, 70 in Fig. 2.

and particularly, but not exclusively, to railway The upper part 3 of the crane is mounted slewing cranes, in which the crane jib during on a bridge frame 2 equipped with two bo travelling is stowed on a repository wagon. gies 1. The upper part 3 of the crane is con A solution is known from Patent Specifica- nected to a crane jib 4 by a jib mounting 5.

tion DD 51396 whereby a support is dis- 75 During transit, the crane jib 4 is additionally posed in springing and sliding fashion between supported by a resilient support 6 provided on crane jib and bridge frame. This provides the the bridge frame 2 and a further resilient sup advantage that a part of the inherent mass of port 7 and a support 8 provided on a reposi the crane jib which, in transit, has its tip tory wagon 9. The jib mounting 5 and sup- stowed on a repository wagon, is shifted to 80 port 8 are pivotable and displaceable in the the axles of the crane bogie which is located direction of the track. As springing elements, in the direction of the crane jib, so achieving a the resilient supports 6 and 7 comprise thrust compensation of the axle loads of the two springs 16 which are mounted on the crane bogies. jib 4 and are supported via sliding blocks 17 A disadvantage is that only a compensation 85 provided on supporting plates 10, 11 on the but no relief of the axles of the crane bogie bridge frame 2 and on the repository wagon 9 can be achieved. respectively. The resilient support 7 comprises Patent Specification DE 1 152 796 discloses clamping elements 12 by which the effect of a solution which achieves a reduction in axle the resilient support 7 can be cancelled out or loads by the fitment of accessory bogies. A 90 reduced when the crane jib 4 is placed on the disadvantage here is that the change-over repository wagon 9. The support 8 is from transit to crane operation in the direction equipped with retaining elements 13 to ac of the track requires considerable conversion commodate lifting forces on the crane jib 4.

costs. Another disadvantage is the high cost The support 8 is guided in a bearing structure of producing the accessory bogies. 95 14 fixed on the repository wagon 9. During According to the present invention there is transit, the counterweights 15 required in provided a mobile jib crane in which during crane operation, or a proportion of their mass, transit the crane jib is supported on a jib are placed on the bearing structure 14.

mounting located on the upper body portion A further alternative embodiment according of the crane carried on a bridge frame or 100 to the invention resides in that in addition to chassis mounted on wheels and supported on the supports 6, 7 and 8, further supports are a repository wagon provided with wheels, provided on the repository wagon 9.

said jib being supported on the jib mounting The advantage of the solution according to and on at least three supports, at least two of the invention lies in the fact that the mass of the supports being of resilient construction 105 the crane jib 4 and a part of the mass 15 of and at least two of the supports being pro- the crane are shifted to the repository wagon vided on the repository wagon. 9 so reducing the axle loads of the crane.

The resilient supports ideally consist of

Claims

spring elements disposed in the jib or fixed on CLAIMS the jib. They are

connected to sliding blocks 110 1. A mobile jib crane in which during tran which, in transit, rest on the bridge frame or sit the crane jib is supported on a jib mount on the repository wagon as the case may be. ing located on the upper body portion of the With extreme axle load reduction on the crane carried on a bridge frame or chassis axles of the repository wagon, lifting forces mounted on wheels and supported on a repo- on the outer bearings on the repository wagon 115 sitory wagon provided with wheels, said jib are absorbed by counter weights of the crane being supported on the jib mounting and on at which during transit condition load the bearing least three supports, at least two of the sup construction and clamping elements make it ports being of resilient construction and at possible to rest the jib on at least one sup- least two of the supports being provided on port, ideally the resilient support on the repo- 120 the repository wagon.

sitory wagon.
2. A mobile jib crane as claimed in claim An embodiment of the invention will now 1, in which the jib mounting and the tip end be described, by way of an example, with support provided on the repository wagon are reference to the accompanying drawings, in of non-resilient construction.

which:- 125
3. A mobile jib crane as claimed in claim 1 Figure 1 is a side view of a railway crane in or claim 2, in which at least one of the resili the transit position; ent support is equipped with clamping ele Figure 2 is a plan view of the railway crane ments.

shown in Fig. 1;
4. A mobile jib crane as claimed in any Figure 3 is a section through the resilient 130 one of claims 1 to 3, in which counterweights 2 GB2189203A 2 of the crane are placed on a bearing structure which is provided on the repository wagon.
5. A mobile jib crane as claimed in any one of claims 1 to 4, in which in addition to said supports, other supports are disposed on the repository wagon.
6. A mobile jib crane substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.

Printed for Her Majesty's Stationery Office by Burgess & Son (Abingdon) Ltd, Dd 8991685, 1987. Published at The Patent Office, 25 Southampton Buildings, London, WC2A 1 AY, from which copies may be obtained.

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