GB2190342A

GB2190342A - Towable mobile crane

Info

Publication number: GB2190342A
Application number: GB08709476A
Authority: GB
Inventors: Harry Hellwig; Klaus-Dietrick Sturm; Horst Schreiber
Original assignee: MAN Takraf Fordertechnik GmbH
Current assignee: Takraf GmbH
Priority date: 1986-05-12
Filing date: 1987-04-22
Publication date: 1987-11-18
Also published as: DD248995A1; DE3712526A1; GB8709476D0; GB2190342B

Description

GB2190342A 1 SPECIFICATION support arms and the support member to transmit

the traction and compression forces Towable mobile crane from the supporting member to the supporting frame.

This invention relates to towable mobile 70 The support members for the middle buffer cranes, such as cranes movable along a track coupling and the drawgear are thereby con and particularly, but not exclusively, to railway structed so that their outward form is identi slewing cranes which when set up for crane cal.

transportation in a train unit, to operate in the In consequence, without making any change direction of the track, require considerable 75 to the supporting frame, it is possible to con load freedom. vert the crane for use. In the rail travel posi Known from German Patent Specification tion, the crane supporting arms, on the ends

No, 1 185 788 is a solution in which the of which the plunger buffers are disposed, are plunger buffers of the buffer gear are disposed pivoted relative to the supporting frame to on pivotable crane support arms which are 80 bring them into the direction of the railway pivoted to extend in the direction of the track tracks. When this happens, the locking eie in preparation for the train journey. To secure ments disposed between the supporting arms them and to accommodate the drawgear, and the supporting member ensure a clear there is between the crane support arms a ance-free and form-locking connection be support member which is separably articulated 85 tween each support arm and the support on the support arm cross-member of the sup- member. The power flow of the traction or porting frame. compression forces occurring while the train is A disadvantage is that the multiple bolting running passes quite clearly into the longitudi of the support member to the crane support- nal members of the supporting frame, via the ing arms and the supporting arm cross-mem- 90 supporting arms. In addition, the oppositely ber due to the varying elasticity ratings cannot disposed crane support arms and the support guarantee any unequivocal power flux. Conse- ing members located between them are quently, dimensioning of the force and entail- clamped to one another by a clamping means, ing an uneconomical usage of material be- so terminating the conversion to the rail travel comes necessary. Another disadvantage for 95 position.

the operator is the considerable conversion To convert the unit to the crane operating time cost, since the supporting members have position, the retaining member may be pulled to be undone and removed in order to achieve into the head-piece of the supporting frame by a greater load freedom when the crane is op- any suitable elements generally known in engi erated in the track direction. 100 neering, once the crane support arms have Also known is a soiution disclosed in Ger- been pivoted into the supporting position. The man Patent Specification No. 1 152 796 in result is considerable load freedom when the which accessory bogies are provided on which crane is being operated in the track direction, the crane supporting arms which are pivoted Alternatively, the supporting member may be into the direction of the tracks while the train 105 tilted upwardly relative to the supporting is running are mounted. The draw and buffer frame.

gears are disposed in the accessory bogies. Two embodiments of the invention will now With this arrangement, a disadvantage is the be described, by way of examples, with refer high cost of manufacturing the accessory bo- ence to the accompanying drawings, in which:

gies and the high cost of conversion time 110 Figure 1 is a plan view of a first embodi which results from the fact that in order to ment with a displaceably disposed supporting achieve a greater load freedom in the direction member in the rail travel position:

of the track, the accessory bogies have to be Figure 2 is a plan view of the first embodi 5fted out of the way. ment showing the displaceably disposed sup- Another disadvantage is that when the train 115 porting member in the crane operating posi- is running, mounting of the crane support tion; arms on the accessory bogies and the resul- Figure 3 is a plan view of a second embodi tant partial relieving of the load on the wheel ment with a tiltably disposed supporting mem axles of the cran'e gives rise to an uncontrolla- ber in the rail travel position; ble statically indeterminate distribution of the 120 Figure 4 is a section taken along the line A load over the wheel axles. A indicated in Figure 3; and According to the present invention there is Figure 5 shows the tiltably disposed sup provided a towable mobile crane having a porting member of Figure 3 in the crane oper supporting frame provided with pivotable sup- ation position.

port arms having buffers mounted thereon, 125 In the embodiment shown in Figure 1 of the said arms when in the crane travel position drawings, a drawgear 3 is located in a head being locked to a supporting member on piece 1 of a supporting frame 2. In this em which the drawgear or the middle buffer cou- bodiment a longitudinally movabie supporting pling are mounted, said locking being affected member 4 is provided for mounting of the by locking members disposed between the 130drawgear 3. The plunger buffers 5 are pivo- 2 GB2190342A 2 tally disposed on the end faces of crane support arms 6. The crane support arms are as shown in Figure 2 pivoted by the retraction and telescopic extension of piston and cylinder devices 7. According to this embodiment, locking elements 8 for the clearance-free and force-locking connection of the arms 6 to the supporting member 4 when in the rail travel position are provided on the crane support arms 6. The oppositely disposed crane suport arms 6 are clamped to one another in the rail travel portion by a clamping means 9 disposed on the opposed end faces of the arms 6.

In the embodiment shown in Figure 3, the supporting member 4, after slackening of the clamping means 9 and after the crane support arms 6 have been pivoted away laterally, is tilted upwardly by a piston and cylinder device 10. The bolt pivot joints 11 are thereby provided in longitudinal horizontal holes in order reliably to exclude the possibility of cooperation in crane travel of the load initiated by the drawgear 3. By reason of the solution ac- cording to the invention, the advantages arise that in rail travel, a clear power flow is achieved in that the loading absorbed by the draw and buffer gear 3 and 5 is transmitted into the heavily dimensioned longitudinal mem- bers of the supporting frame 2 and that greater load freedom is guaranteed during crane operation.

Claims

1. A towable mobile crane having a sup porting frame provided with pivotable support arms having buffers mounted thereon, said arms when in the crane travel position being locked to a supporting member on which the drawgear or the middle buffer coupling are mounted, said locking being affected by locking members disposed between the support arms and the support member to transmit the traction and compression forces from the sup- porting member to the supporting frame.

2. A towable mobile crane as claimed in claim 1, in which the supporting member is movably mounted in a head-piece of the supporting frame.

3. A towable mobile crane as claimed in claim 2, in which the supporting member is disposed for longitudinal movement.

4. A towable mobile crane as claimed in claim 2, in which the supporting member is mounted for tilting movement.

5. A towable mobile 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 lAY, from which copies may be obtained.