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US 6,684,537 B2Granted
Excavator with a piping structure for absorbing variations in hose length
AssigneeKubota Corporation
InventorsToshiki Ichikawa, Takeshi Ikumura
Life of this patent
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AssigneeKubota Corporation
InventorsToshiki Ichikawa, Takeshi Ikumura
Estimating the term…
An excavator such as a backhoe has a group of hoses variable in length when a boom moves up and down. To avoid the group of hoses bulging to obstruct view when the boom is raised to an uppermost position, the group of hoses has a length absorbing portion disposed in a swivel base instead of being disposed on a boom as in the prior art.
An excavator, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
With a dipper-arm pivoted on a cantilever beam , i.e. boom: working downwardly and towards the machine, e.g. with backhoes
Working downwardly and towards the machine, e.g. with backhoes: backhoes of the miniature type
Connections to the frame; Supports for booms or arms: the boom being pivotable relative to the frame about a vertical axis
Arrangements on backhoes for alternate use of different tools: of several tools mounted on one machine
Term ended 26 Feb 2022 (estimated)
1. Field of the Invention
This invention relates to an excavator such as a backhoe, and more particularly to a piping structure for supplying and draining pressure oil to/from a boom cylinder, an arm cylinder and a bucket cylinder.
2. Description of the Related Art
FIG. 1 is a side elevation of a backhoe which is one example of excavators according to this invention;
FIG. 2A is an elevation showing a relationship between a boom structure and a group of hoses, with the boom placed in an uppermost position;
FIG. 2B is a rear view showing a principal portion of FIG. 2A;
A preferred embodiment of this invention will be described hereinafter based on a backhoe which is one example of excavators.
FIG. 1 shows an overall construction of the excavator (backhoe) 1. The backhoe 1 has right and left crawlers 2 exemplifying a running device 3 with drive sprockets driven by a hydraulic propelling motor 4, for example.
A swivel base (swivel body) 7 is mounted above the running device 3, or above a track frame 5 substantially supporting the right and left crawlers 2, to be swivelable completely (through 360 degrees) about a vertical axis O—O through a swivel bearing 6. A bulldozer blade 8 is attached to the front of track frame 5 between the right and left crawlers 2.