Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1997-09-30
2000-02-01
Underwood, Donald W.
Material or article handling
Vertically swinging load support
Shovel or fork type
414722, 414719, 212347, 212261, E02F 300
Patent
active
06019569&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
This invention relates generally to excavation machines like hydraulic power shovels to be used for ground excavation, and more particularly to an ultra-mini turn type excavation machine having a boom comprised of two parts which are foldable into and out of an angularly bent form through a cross-link, permitting to make turns within an extremely small radius.
TECHNICAL BACKGROUND
Excavation machines, for example, hydraulic power shovels are largely constituted by a base carrier and an upper rotary body which is rotatably mounted on the base carrier through a swivel mechanism. Provided on the upper rotary body are an operator's cab to be occupied by a machine operator, and a front working mechanism including a boom, an arm and a bucket. The boom, arm and bucket are driven from hydraulic cylinders, and, for driving these hydraulic cylinders and other hydraulic actuators such as vehicle drive motor and rotating motor, an engine is accommodated on a machine chamber of the vehicle along with hydraulic pump, change-over valve etc.
In order to prevent the front working mechanism from hitting against surrounding buildings or other structures as it is turned in different directions during a ground working operation in a limited space, it is necessary to minimize the radius of turns of the upper rotary body as small as possible. In this connection, there have been developed the so-called ultra-mini turn type hydraulic power shovels which are arranged to have a turn radius within the breadth of the upper rotary body. Disclosed in Japanese Laid-Open Patent Specification H7-243223 is a typical ultra-mini turn type hydraulic power shovel. This prior art ultra-mini turn type hydraulic power shovel is arranged in the manner as will be described below with reference to FIGS. 9 through 13.
Referring first to FIG. 9, indicated at 1 is a base carrier of the machine, and at 2 is an upper rotary body. The base carrier 2 is constituted by a crawler type carrier having a pair of crawler belts 3 along the opposite lateral sides thereof. The upper rotary body 2 is rotatably supported on the base carrier 1 through a swivel base 4. Mounted on top of a frame 5 of the upper rotary body 2 is an operator's cab 6 which is equipped with a driver's seat for an machine operator, along with operating levers and other manual operating or control means. The front working mechanism 7 is largely constituted by a boom 8, an arm 9 and a bucket 10, and provided on the part of the upper rotary body 2. In this instance, as shown in FIG. 10, the operator's cab 6 and the front working mechanism 7 are located side by side in left and right front sections of the upper rotary body 2. Further, denoted at 11 is a machine chamber to accommodate therein hydraulic cylinders which serves as drive means for the front working mechanism, along with an engine, a hydraulic pump, change-over valves and an operating fluid tank for supplying pressure oil to hydraulic actuators such as hydraulic motors or other drive means for vehicle driving and rotating mechanisms of the machine. The machine chamber 11 extend from the rear side of the operator's cab 6 toward a mount base of the front working mechanism 7.
In this case, instead of being directly connected to the upper rotary body 2, the front working mechanism 7 is mounted on a swing post 12 which is connected to the frame 5 of the upper rotary body 2. This swing post 12 is provided for swinging motions of the front working mechanism 7, that is to say, for turning the front working mechanism 7 in the horizontal direction. In this regard, FIG. 11 shows arrangements of a boom foot portion where a base end portion of the boom 8 is connected to the swing post 12. The swing post 12 is horizontally swivellably connected to a vertical swing shaft 13 which is provided on the frame 5 of the upper rotary body 2. The swing shaft 13 is divided into upper and lower portions for passage therethrough of a hydraulic conduit pipe 14. Although not shown in the drawings, a swing drive hydraulic cylinder is connected b
REFERENCES:
patent: 4439089 (1984-03-01), Anderson et al.
patent: 4728251 (1988-03-01), Takashima et al.
patent: 5240366 (1993-08-01), Bamford
Hitachi Construction Machinery Co. Ltd.
Underwood Donald W.
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