Excavating – Combined or convertible
Patent
1996-02-29
1997-11-25
Melius, Terry Lee
Excavating
Combined or convertible
37408, 414912, 172438, E02F 396
Patent
active
056899050
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a hydraulic power shovel with an arm incorporating a breaker, capable of mounting both an excavating bucket and a breaker chisel.
BACKGROUND ART
Referring to FIG. 8, a conventional hydraulic shovel apparatus has a main structure 1, comprising a lower travelling structure la and an upper turret structure 1b, and is equipped with a working machine which is swingably attached to the front side of the main structure 1 and which is composed of various parts such as boom 2, boom cylinder 3, arm 4, arm cylinder 5, bucket 6, bucket cylinder 7, bucket link 8, intermediate link 9, and so forth. Hydraulic shovels, having the described constructions, are widely used for various purposes including excavation.
In the meantime, currently known are hydraulic shovel working machines of the type in which the arm 4 is replaced by a breaker-incorporating arm which incorporates a breaker mechanism and which detachably carries at its end a chisel for breaking operation (see, for example, Japanese Utility Model Laid-Open No. 4119847). The operation for attaching the chisel to the working machine is as follows. The bucket cylinder 7 is operated in the contracting direction so that the bucket 6 is moved forwardly, i.e., to a dumping position, through the action of the bucket links 8, the intermediate links 9, and the bucket brackets 6a, as shown in FIG. 9. A detachable chisel 10 is attached to the end of the breaker-incorporating arm 4a in this state. According to this arrangement, the apparatus becomes ready for performing breaker work, required in rock cutting or pavement breaking simply by attaching the chisel 10 in a short time. This eliminates laborious work which otherwise may be required for detaching the bucket 6 from the working machine of the hydraulic shovel and mounting a breaker as an independent attachment, thus reducing the man-hours required in replacement work.
The above-described working machine of hydraulic shovel apparatus, however, suffers from a problem in that the breaking area is restricted, particularly when the breaking work has to be done in the vicinity of a wall without demounting the bucket 6, because the chisel 10 can be attached only when the bucket 6 is in the dumping position. More specifically, referring to FIG. 10, when breaking work is conducted in the vicinity of a wall W, the bucket cylinder 7 is contracted so as to set the bucket 6 to the dumping position while keeping the chisel 10 in a vertical posture, but a wide area is left without being broken, corresponding to the distance l.sub.1 between the chisel 10 and the wall W. In addition, insufficient penetration depth is caused because the penetration of the chisel 10 is limited to h1. This problem would be overcome by demounting the bucket 6. Such a solution, however, impairs the working efficiency because the demounting of the bucket 6 is necessary each time the breaking work is to be performed.
SUMMARY OF THE INVENTION
The present invention is aimed at obviating the above described problem of the known arts. Thus, an object of the present invention is to provide a hydraulic shovel which is equipped with an arm incorporating a breaker and which permits easy attaching/detaching of a chisel without requiring a bucket to be demounted from an arm, while achieving increased chisel penetration and improved efficiency of work, such as breaker work in the vicinity of a wall.
To this end, the present invention in its first aspect provides a hydraulic shovel with an arm incorporating a breaker, comprising: a boom pivotally connected to a hydraulic shovel; the arm incorporating the breaker and pivotally connected to an end of the boom; an arm cylinder pivotally connected between the arm incorporating the breaker and the boom; a bucket having a pair of bucket brackets fixed thereto, each bucket bracket having one end pivotally connected to a bracket provided on an end of the arm incorporating the breaker; a pair of bucket links each having one end pivotally connected to one of the bucket brackets
REFERENCES:
patent: 3586113 (1971-06-01), Grant
patent: 3710472 (1973-01-01), Gremillion et al.
patent: 4087010 (1978-05-01), Stormon
patent: 4099579 (1978-07-01), Stormon
patent: 4230435 (1980-10-01), Azevedo
patent: 4466494 (1984-08-01), Hanson
patent: 4602821 (1986-07-01), Schaeff
patent: 5115583 (1992-05-01), Vail
patent: 5197212 (1993-03-01), Vail
patent: 5456028 (1995-10-01), Larson
Batson Victor
Komatsu Ltd.
Melius Terry Lee
LandOfFree
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