Excavating – Cable-operated – Boom-type
Patent
1997-05-05
1998-10-20
Carone, Michael J.
Excavating
Cable-operated
Boom-type
414694, 414685, E02F 338
Patent
active
058228926
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a working vehicle, and particularly to a working vehicle having a working unit such as a bucket or the like in front of the operator's seat.
BACKGROUND ART
An example of a previously proposed working vehicle having a working unit, such as a bucket, etc., forward of an operator's seat is disclosed in Japanese Patent Application Laid-open No. 6-136779. A construction machine 100, in the form of a working vehicle, has a first boom 131a attached to a vehicle body frame 121, a second boom 131b attached to the first boom 131a, and an arm 132 attached to the second boom 131b, so as to respectively be free to swing. A working unit 130, having a bucket 133 or the like, is attached to the arm 132. In a traveling posture, the bucket 133 is stably placed on a bracket 115, fixed on the front portion of a base frame 111, and is stably stored by hooking the front end portion of the bucket 133 with a hooking device 116.
The construction machine 100 is provided with a first boom hydraulic cylinder 135 which is attached to the vehicle body frame 121 and to the second boom 131b for swinging the second boom 131b; a second boom hydraulic cylinder 136 which is attached to the second boom 131b and to the first boom 131a for swinging the second boom 131b; and an arm hydraulic cylinder 137 which is attached to the second boom 131b and to the arm 132 for swinging the arm 132. As for these booms, hydraulic cylinders, etc., the vehicle body frame 121 and the first boom 131a are connected by a pivot pin 123, the first boom 131a and the second boom 131b are connected by a pivot pin 141, the vehicle body frame 121 and the first boom hydraulic cylinder 135 are connected by a pivot pin 124, and the second boom 131b and the first boom hydraulic cylinder 135 are connected by a pivot pin 143. In the storage posture illustrated in FIG. 4, relative to a line connecting the pivot pin 123 and the pivot pin 141, the pivot pin 124 is positioned near one end portion of the line and the pivot pin 143 is positioned near the other end portion of the line.
However, in the traveling posture (FIG. 4) with the working unit 130 being stored, the above-described construction machine 100 has an increased amount of front overhang 112 and a greater rotation radius. For example, when an operator's cab 160 is attached on the left side while the working unit 130 is attached on the right side, a height 113 of the storage posture of the arm 132 and the arm hydraulic cylinder 137 becomes great; therefore, there is a disadvantage of low visibility in the direction the lower part of the right front side.
As the art for improving the above-described visibility, a construction machine 110 illustrated in FIG. 5 is known. The construction machine 110 has a higher visibility of the side portion in a traveling posture with the working unit 130 being stored as compared to the construction machine 100 in a stored posture. However, since a height of stored posture 114 of the working unit 130 is high, the position of the center of gravity of the construction machine 110 is high, and a disadvantage exists with regard to the stability at the time of traveling at high speed.
Further, as the number of traveling vehicles on roads is increasing recently, the improvement of the transportability (traveling ability) of working vehicles on ordinary roads is strongly demanded. Especially, for working vehicles which frequently have to go to different working places, the ability of traveling on an ordinary road as well as increased traveling speed at the time of transportation is demanded. In this case, stability at the time of traveling at high speed, cornering ability, reduction of the entire length, visibility, agility, etc., are demanded.
SUMMARY OF THE INVENTION
The present invention is made in order to eliminate the above-described disadvantages in the conventional art, and its object is to provide a working vehicle having high visibility and transportability, and a large excavating force over a wide range, with a working unit wh
REFERENCES:
patent: 5375348 (1994-12-01), Kishi
patent: 5413454 (1995-05-01), Movesian
patent: 5584643 (1996-12-01), Nishimura et al.
patent: 5611657 (1997-03-01), Peterson
Ohbatake Youjirou
Sasaki Hidetoshi
Carone Michael J.
Komatsu Ltd.
Pezzuto Robert
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