Excavating – Scoop or excavating and transporting container – Dipper-type
Reexamination Certificate
2001-11-28
2003-06-17
Novosad, Christopher J. (Department: 3671)
Excavating
Scoop or excavating and transporting container
Dipper-type
C037S466000, C414S694000
Reexamination Certificate
active
06578296
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a hydraulically driven type working machine, and more particularly to a hydraulic pipe arrangement mechanism of a hydraulically driven excavation working machine equipped in construction machinery.
BACKGROUND OF THE INVENTION
A hydraulically driven excavation working machine equipped in construction machinary such as an excavator or the like is structured such that members such as a boom, an arm, a bucket and the like are connected in series in accordance with this order from a machine main body so as to freely bend with each other. In order to supply an oil pressure to a hydraulic actuator for operating these members, there is used a hydraulic pipe arrangement apparatus for arranging a hydraulic hose from a side of a machine frame along outer portions or inner portions of the boom and the arm.
However, the conventional hydraulic pipe arrangement apparatus mentioned above has the following problems.
If it is desired to insert the hydraulic pipe arrangement in the side of the machine frame into the inner portion of the boom from a base portion of the boom over a boom hoisting supporting point pin or to insert the hydraulic pipe arrangement installed within the boom into the inner portion of the arm over a joint connection supporting point pin of the arm, it is impossible to apply a slack to the hydraulic pipe arrangement in the portion over the supporting point pins. Accordingly, due to a hoisting swing motion of the boom and a bending swing motion of the arm, the hydraulic pipe arrangement is in contact with the boom hoisting supporting point pin or the joint connection supporting point pin of the arm so as to be bent, thereby damaging the hydraulic pipe arrangement. Accordingly, the structure has been conventionally made such that these hydraulic pipe arrangements have been executed so as to extend along the outer portions of the boom and the arm, or a hole is provided in a wall of the boom and the hydraulic pipe arrangements are inserted into the inner portion of the boom, so that it has been hard to execute the hydraulic pipe arrangements in the inner portions of the boom and the arm without exposing them to the outer portion of the boom and the arm.
Further, in the hydraulic pipe arrangement to a hydraulic actuator for driving a boom hoisting operation, the actuator swings tilting in a longitudinal direction. Accordingly, a slack is provided in the hydraulic pipe arrangement extended to the actuator from the side of the machine frame, and it is impossible to extend to the actuator from the side of the machine frame without slacking the hydraulic pipe arrangement.
Further, the hydraulic pipe arrangements connected to the hydraulic actuator for driving the boom hoisting operation, the hydraulic actuator for driving the arm bending operation and the hydraulic actuator for driving a working tool are all provided with pipe arrangement connecting devices exposing to the outer portions of these actuators, and it is hard to execute the hydraulic pipe arrangements so that the hydraulic pipe arrangements of the respective actuators are not seen from an outer appearance of the working machine.
DISCLOSURE OF THE INVENTION
The present invention is made by paying attention to the problems in the conventional art mentioned above, and an object of the present invention is to provide a hydraulically driven type working machine in which a rotary joint of a hydraulic pipe arrangement is provided in a boom hoisting supporting point and an arm joint connection supporting point, whereby a pipe arrangement can be installed in inner portions of a boom and an arm without applying a slack to the hydraulic pipe arrangement, the rotary joint of the hydraulic pipe arrangement is provided in a hoisting supporting point of a hydraulic actuator for driving a boom hoisting operation, whereby the pipe arrangement can be executed in the hydraulic actuator for driving the boom hoisting operation without slacking the hydraulic pipe arrangement from a side of a machine frame, and fluid flow passages communicating with respective cylinder oil chambers are provided in inner portions of respective cylinder rods, in the hydraulic actuator for driving the boom hoisting operation, a hydraulic actuator for driving an arm bending operation and a hydraulic actuator for driving a working tool so as to form the respective actuators that the hydraulic pipe arrangements are not exposed, thereby making the hydraulic pipe arrangements invisible from an outer appearance of the working machine, together with an effect of installing the pipe arrangements in the inner portions of the boom and the arm.
In order to achieve the object mentioned above, in accordance with a first aspect of the present invention, there is provided a hydraulically driven type working machine comprises a boom having a vertical swing supporting point supported at a base end side by a machine frame and a joint connection supporting point in a front end side, an arm connected in a base end side to the joint connection supporting point of the boom, a boom driving hydraulic cylinder hoisting around a hoist supporting point provided in the machine frame so as to drive the boom, an arm driving hydraulic cylinder driving the arm and a working tool driving hydraulic cylinder driving a working tool mounted to an arm front end side,
wherein a swivel joint mechanism for relaying a hydraulic pipe arrangement from a side of the machine frame is provided at a center of at least one of the vertical swing supporting point, the joint connection supporting point and the boom driving hydraulic cylinder hoist supporting point.
In accordance with the first aspect, since at a time of pipe arrangement in the arm driving hydraulic cylinder and the working tool driving hydraulic cylinder, it is possible to execute a rotary joint pipe arrangement around the boom hoist supporting point by connecting a pipe arrangement extended from the side of the machine frame to one side hose joint of a swivel joint mechanism provided at the boom hoist supporting point and connecting a hydraulic cylinder side pipe arrangement extended along the boom side to another side hose joint rotating around the boom hoist supporting point, and it is not necessary to apply a slack to the hydraulic pipe arrangement between the side of the machine frame and the side of the swinging boom, it is possible to obtain an economical pipe arrangement, a durability of the hydraulic hose is improved due to no bending application to the pipe arrangement, and it is possible to correspond even to a narrow pipe arrangement space.
Further, in the pipe arrangement to the working device driving hydraulic cylinder extending to the arm via the boom, it is possible to execute the rotary joint pipe arrangement around the arm joint connection supporting point by connecting a pipe arrangement extended along the side of the boom to one side hose joint of the swivel joint mechanism at the center of the arm joint connection supporting point existing in a front end side of the boom and connecting a hydraulic cylinder side pipe arrangement extended along the arm side to another side hose joint rotating around the arm joint connection supporting point. Since it is not necessary to apply a slack to the hydraulic pipe arrangement between the boom and the arm bending with respect to the boom, it is possible to obtain an economical pipe arrangement, and a durability of the hydraulic hose is improved due to no bending application to the pipe arrangement.
Further, in the pipe arrangement from the side of the machine frame to the boom driving hydraulic cylinder, it is possible to execute the rotary joint pipe arrangement around the cylinder hoist supporting point by connecting the pipe arrangement extended from the side of the machine frame to one side hose joint of a swivel joint mechanism provided in the boom driving hydraulic cylinder hoist supporting point and connecting the pipe arrangement extended along the cylinder side to another side hose joint rotating around the cylinder hoist
Futami Tatsuya
Kanemaru Kenji
Kimoto Kenzo
Maruyama Jun
Naruse Masami
Armstrong Westerman & Hattori, LLP.
Komatsu Ltd.
Novosad Christopher J.
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