Hydraulic shovel

Details Hydraulic shovel Hydraulic shovel

2006-02-07

2010-06-01

Pezzuto, Robert E (Department: 3671)

Excavating

Ditcher

Condition responsive

C060S431000

Reexamination Certificate

active

07726050

ABSTRACT:
A line93is provided with a line71communicating the line93and a hydraulic oil tank51. The line71is provided with a throttle72to construct a throttle-provided line7. When air is trapped between the hydraulic oil tank51and the hydraulic pump52, the hydraulic pump52is driven to discharge the air from the throttle-provided line7to the hydraulic oil tank51, thereby removing the air in the hydraulic circuit5. When the air is removed, resistance caused by the throttle72is increased, which makes hydraulic oil flow from a pilot pump522to a PPC valve. Since the throttle-provided line7realizes air removal with a simple structure, a hydraulic cylinder44can be supplied with the air-removed hydraulic oil from an initial stage, thereby enhancing responsiveness of the hydraulic cylinder44.

REFERENCES:
patent: 7441407 (2008-10-01), Sawada
patent: 62-002801 (1987-01-01), None
patent: 62-002802 (1987-01-01), None
patent: 62-156603 (1987-10-01), None
patent: 08-100448 (1996-04-01), None
patent: 2000-039117 (2002-02-01), None
patent: 2003-278185 (2003-10-01), None
Notification Concerning Transmittal of International Preliminary Report on Patentability, Chapter I of the Patent Cooperation Treaty, and Written Opinion of the International Searching Authority, dated Aug. 14, 2007, for PCT/JP2006/302079, 4 sheets.

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