Excavating – Combined or convertible
Patent
1993-06-30
1994-12-20
Taylor, Dennis L.
Excavating
Combined or convertible
37410, E02F 376
Patent
active
053736524
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a sweeping appliance for excavators of the type comprising a pivotable arm or stick and a bucket carried by said stick via a transverse pivot pin, said appliance including a rotary brush arranged at a free end of a holder whose opposite end is articulated to said stick or said pivot pin to allow pivoting of the holder between a position remote from said stick, in which the brush can actively perform a sweeping operation, and an inactive position close to said stick.
DESCRIPTION OF THE PRIOR ART
A sweeping appliance of the type described above is disclosed in SE 8604502-8 (Publ. No. 454,899). Immediately after an excavating operation by means of the bucket, this sweeping appliance can in a smooth, quick and labor-saving manner be used for final uncovering of buried lines, such as electric lines, gas soil pipes, water conduits and the like, in a sweeping operation which is gentle on the lines. An essential advantage of the appliance is that it can cooperate alternately with the bucket in such a manner that on the one hand the appliance can be released from its inactive position and moved to an active position immediately after a completed excavating operation and, on the other hand, it can easily and rapidly be moved back to its inactive position after the sweeping operation is completed, thereby again permitting an excavating operation. In other words, the bucket need not be dismounted from the associated standard mounting or appliance mounting and replaced by a separate sweeping appliance, nor is it necessary to operate with two separate vehicles, one fitted with a sweeping appliance and the other with a bucket. Since both functions of the only vehicle, i.e. excavating by means of the bucket and sweeping by means of the sweeping appliance, can be alternated without any time-consuming shifting operations, the total operation of uncovering the buried lines can be carried out extremely rapidly and efficiently and at minimum cost.
A serious drawback of the sweeping appliance according to SE 8604502-8 is however that the brush--apart from being rotatable per se--is immovably mounted on the associated holder. The earth which is to be brushed away from the lines in a trench that has been dug can thus be brushed away merely straight backwards or straight forwards from the brush in a direction perpendicular to the axis of rotation thereof. In practice, this direction coincides with the vertical plane in which the stick is pivotable. This limitation of the possibilities of moving the brush renders a number of operations difficult or even impossible, for example brushing of intersecting lines, brushing of complicated compositions of lines, brushing of rails etc.
SUMMARY OF THE INVENTION
The main object of the present invention is to provide a sweeping appliance of the type described by way of introduction, in which the brush itself can be shifted between different positions relative to the plane in which the stick and the holder are movable. A further object of the invention is to provide an appliance in which this possibility of shifting is accomplished by simple and inexpensive means. One more object is to provide a sweeping appliance in which at least the part of the holder which is closest to the brush requires a minimal space, thereby making the brush easily movable even in narrow spaces, such as narrow trenches or ditches. A still further object of the invention is to provide an appliance in which brushes of different dimensions can readily be used on one and the same holder.
BRIEF DESCRIPTION OF THE INVENTIVE CONCEPT
To achieve at least the main object of the invention, the sweeping appliance according to the invention is characterised in that the holder is divided into at least two parts, of which an outer, brush-carrying part is rotatable relative to an inner part, more precisely by means of a rotary unit operating between said two parts, thereby permitting the brush to turn about an axis extending at an angle, e.g. at right angles to the
REFERENCES:
patent: 3779408 (1973-12-01), Ivie
patent: 3922745 (1975-12-01), Lehman
patent: 4100688 (1978-07-01), Grist
patent: 4974349 (1990-12-01), Timmons
Olsson Gunner
Taylor Dennis L.
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