Excavating – Snow or ice removing or grooming by portable device – Railway clearer
Patent
1985-12-11
1987-05-12
Eickholt, E. H.
Excavating
Snow or ice removing or grooming by portable device
Railway clearer
414723, 172272, E02F 376, B66C 2300
Patent
active
046638660
DESCRIPTION:
BRIEF SUMMARY
The invention refers to a quick-action attachment for working implements of the type indicated in the preamble of the attached claim 1.
For the purpose of attaching working implements such as dredger shovels, loading shovels, forks and the like to working machines it has long been known to use studs which are introduced through lugs provided on respectively the working implement or the working machine; in addition to the fact that this coupling procedure is very cumbersome and even risky, there is also a great risk that the lugs in some of the parts will be deformed so that insertion of the studs no longer will be possible.
In order to eliminate the serious drawbacks of this kind of conventional attachment constructions have been proposed which comprise undercut guide bars arranged in angular relation to each other. These guide bars are ordinarily permanently provided on a dredger shovel or the like and the coupling is obtained by providing an attachment plate at the outermost part of the arm of a digging machine, said attachment plate having bevelled edges which also are disposed angularly in relation to each other, said attachment plate being laterally introduced into the groove formed by the undercut guide bars. After introduction of the attachment plate to the bottom of the groove it is locked hydraulically, for example by moving pins in an outward direction into contact with abutments provided in connection with the guide bars.
The inconvenience inherent with these known constructions consists in that it is relatively complicated to laterally introduce the attachment plate in a correct way into the groove without tilting and jamming it in the groove. Among other disadvantages may be mentioned that the locking pins have a relatively exposed position and may be damaged during work whereby disconnection or renewed coupling may be obstructed or rendered impossible, that a certain self-locking by wedged-action may arise between the attachment plate and the groove causing difficulties in removing the working implement for exchange, and that the sliding movement between the attachment plate and the groove may involve wear of these parts in particular if dirt and stones are introduced into the groove. Such wear often causes the coupling to become loose after a period of use so that a correct coupling no longer can be guaranteed.
There is further known an arrangement for mounting a crane jib to a vehicle comprising an attachment plate having bevelled side edges mounted on the vehicle and a "slide frame" provided on the crane jib, this slide frame having undercut side edges co-operating with the bevelled edges of the attachment plate. The slide frame is adapted to slide on the attachment plate and to be hydraulically locked thereon in an optional position. Both the side edges of the attachment and the undercut surfaces of the slide are mutually parallel. However, this arrangement is in the first place conceived for optional positioning of the crane jib along the attachment plate and could not operate as quick-action attachment because the insertion of the slide frame on to the attachment plate would be too complicated due to the exact tolerance required between the co-operating surfaces.
A further problem encountered for example in connection with the coupling of a dredger shovel to a digging machine arm is caused by the fact that it is often desirable to be able to mount the shovel both for deep and high excavation, which means with the dredger shovel mounted in two alternative positions at 180.degree. angular distance in relation to each other. To our knowledge this is not possible with any of the previously known quick-action couplings.
Thus, it is the purpose of the present invention to provide a quick-action attachment for working implements of the type mentioned initially which eliminates the problems discussed above and which permits a quick and reliable attachment of the working implement in at least two different positions.
This purpose is achieved with the aid of a quick-action attachment of the type
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Karlsson Bengt
Niemiaho Lauri
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