Excavating – Combined or convertible – With scraper
Patent
1997-10-24
1999-10-12
Will, Thomas B.
Excavating
Combined or convertible
With scraper
37403, 37410, 37903, E02F 376, E02F 396
Patent
active
059640502
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a screening device, intended to be detachably fastened on a bucket of a digging machine, which in a suitable way comprises a hydraulically operable arm, which is arranged to be detachably fastened on the bucket, the outer portion of the arm comprising a plate-formed means provided with two hooks, which are intended to mesh with means on the bucket, which are adapted to these ones, and the plate-formed means being movably arranged in relation to the arm by means of hinges and a hydraulic piston cylinder.
BACKGROUND OF THE INVENTION
Such devices are previously known, the screening means being intended to take an active position against the bucket itself, when a fine fraction of the material in the bucket shall be emptied out of this one, and an inactive position swung out from the bucket when a coarse fraction of the material shall be emptied out of the bucket.
The problem with known screening devices is that the screening means itself has a complicated fastening on the bucket, which means that the mounting and the demounting work, respectively, of the screening means onto respectively from the bucket itself becomes very extensive. This has the consequence that the owner of the digging machine as a rule must have a special bucket for a certain type of work and a combined aggregate comprising a bucket and a screening device for another type of work.
SUMMARY OF THE INVENTION
This invention intends to eliminate this problem and to provide a new type of screening device which enables a simple mounting of the same on a bucket and a demounting of the same from the bucket, respectively. This means that the owner of the digging machine in this case only needs to purchase a single bucket, which of course is a great advantage from an expenditural point of view. This has been made possible by a screening device of a kind mentioned by way of introduction, which is characterized by the combination of the following features:
The screening device comprises a frame portion and a screening means, which are articulately fastened to each other and which can be adjusted in the direction towards or from each other in a hydraulical way, the hydraulic power being taken from the digging machine;
The frame portion is provided with two hooks, which are intended to be fastened onto means, adapted to these ones and arranged on the bucket for positioning the screening device on the bucket, the frame portion being fastened by squeezing against the bucket by means of the plate-formed means on the outer portion of the arm of the digging machine.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the invention shall be described more closely below with reference to the accompanying drawings, where
FIG. 1 shows the screening device according to the invention, separated from the bucket of the digging machine,
FIG. 2 shows the screening device suspended in the arm of the digging machine during the fastening to the bucket,
FIG. 3 shows the screening device fastened on the arm of the digging machine and the bucket, the screening device being ready to be used,
FIG. 4 shows the screening device in an active position, resting against the bucket, and
FIG. 5 shows the screening device in an inactive position, swung out from the bucket.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
As is apparent from the drawings the screening device comprises a frame portion 1, which is intended to be applied to and be fastened by squeezing against an essentially planar surface portion 2 on the outside of a bucket 3 of a digging machine 4 by means of a plate-formed means 5, which is arranged at the very end of the arm 6 of the digging machine, and which is movably arranged in relation to the arm 6 by means of hinges 7, 8 and a hydraulic piston cylinder 9. The screening device further comprises a screening means 10, which in an active position is intended to be in contact with the bucket (see FIG. 4) and to carry out a screening of the material in the bucket, which can be emptied out of the sa
REFERENCES:
patent: 4858346 (1989-08-01), Schulte
patent: 5241764 (1993-09-01), Modig
patent: 5528844 (1996-06-01), Ellis
patent: 5581916 (1996-12-01), Hirose et al.
patent: 5664348 (1997-09-01), Omann
patent: 5771612 (1998-06-01), Lynch
Hartmann Gary S.
Soraker Gravmaskins AB
Will Thomas B.
LandOfFree
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