Excavating – Combined or convertible – Combined with fork or rake
Patent
1992-08-19
1993-09-07
Taylor, Dennis L.
Excavating
Combined or convertible
Combined with fork or rake
37901, 414725, E02F 3407
Patent
active
052417646
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention concerns a bucket assembly with screening function, comprising a bucket member connectible to at least one pivotable operating arm on a vehicle and having, in addition to two side walls and a curved wall extending therebetween, a bottom wall forming an extension of said curved wall between said side walls and having a free forward edge adapted to dig into the material to be collected in the bucket assembly; as well as a screening member connected to the bucket member by joints at the upper part of the curved wall and pivotable in relation to the bucket member between an inoperative position and an operative position in which material collected by the assembly can be sorted into a fine fraction passing through the screening member, and a coarse fraction remaining therein.
DESCRIPTION OF THE PRIOR ART
SE Patent Specification 165,844 discloses a bucket assembly of this type, in which the screening member is a grid structure of minute dimensions compared with the bucket member. This grid structure is attached to the ends of two long and curved pivot arms whose opposite ends are articulated to the upper portion of the curved wall of the bucket member. The inoperative position of the grid structure is an upwardly pivoted position in which the pivot arms extend in a substantially vertical direction upwards from the upper edge of the bucket member, while the operative position of the grid structure is a downwardly pivoted position close to the front edge of the bottom wall of the bucket member. Thus, the grid structure is raised when material is taken up in the bucket assembly, and lowered in the area before the front edge of the bucket bottom wall when the material that has been taken up is screened.
This prior art bucket assembly suffers from the serious disadvantage that the grid structure forming the screening member in its inoperative raised position not only obstructs the view between the driver's cab on the vehicle carrying the bucket assembly and the area in front of the bucket, but also hinders the movements of the bucket in different loading situations, e.g. when the bucket is situated on a low level relative to the vehicle. It should also be observed that this bucket assembly is only intended and suited for loading, more precisely front loading, of loose earth and other bulk materials, and not for digging in e.g. tightly-packed earth or stones.
DE 2,114,933 also discloses a similar bucket assembly suffering from essentially the same disadvantages.
SUMMARY OF THE INVENTION
This invention aims at obviating the disadvantages of prior art bucket assemblies of the type described above by providing a bucket assembly in which the screening member in its inoperative position is wholly and completely out of the way, thus enabling an unobstructed view between the driver's cab and the bucket member and allowing free operation of the bucket member also in complicated work situations. Further, the screening member, in its inoperative position, is effectively protected from the particularly severe stresses arising when the assembly is used for digging in tightly-packed stony ground. According to the invention, this is achieved in that the screening member, like the bucket member, has two side walls, a curved wall extending therebetween, and a bottom wall, at least the two last-mentioned walls being formed with holes or openings for allowing the fine fraction of the material to pass through, and having the same contours as the corresponding walls of the bucket member, said screening member, in its inoperative position, being maintained inside the bucket member with its walls in close proximity to the corresponding walls of the bucket member, and, in its operative position, being maintained outwardly pivoted from the bucket member to allow the fine fraction of the material to pass freely through its apertured walls.
The invention is primarily intended for use together with buckets, i.e. buckets of the type which is mounted at the free end of the stick of an excavator and, mo
REFERENCES:
patent: 2501489 (1950-03-01), Aisthorpe
patent: 3003265 (1961-10-01), Lutjens
patent: 3630396 (1971-12-01), Womack
patent: 3765490 (1973-10-01), Logue
patent: 3904052 (1975-09-01), Nordstrom
patent: 5172498 (1992-12-01), Wach
Olsen Arlen L.
Taylor Dennis L.
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