HYDRAULIC CIRCUIT FOR BACKHOE

PURPOSE:To enable adjustment of operation speed of a bucket by providing a bucket speed increase hydraulic lines which can be changed over to a connected state and a separated state with respect to a service port. CONSTITUTION:A bucket speed increase hydraulic line 12 comprising a pipe is connected...

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Bibliographic Details
Main Author AIKAWA TOKUHIRO
Format Patent
LanguageEnglish
Published 25.03.1992
Subjects
DREDGING
FIXED CONSTRUCTIONS
FOUNDATIONS
HYDRAULIC ENGINEERING
SOIL SHIFTING
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Summary:PURPOSE:To enable adjustment of operation speed of a bucket by providing a bucket speed increase hydraulic lines which can be changed over to a connected state and a separated state with respect to a service port. CONSTITUTION:A bucket speed increase hydraulic line 12 comprising a pipe is connected to a connection hydraulic line 11a of a pair of connection hydraulic lines 11a, 11b connected to a bucket cylinder C3 and a bucket valve V3. And the line 12 is connected to a service port 7a of a pair of service ports 7a, 7b. By changing over a service valve S, a first hydraulic pump P1 feeds the pressure oil to be fed to the service port 7a into the pressure oil which is supplied by a second hydraulic pump P2 to drive a bucket cylinder C3 toward the delivery side of bucket. And changeover is effected so that a condition, under which oil is supplied to the bucket cylinder C3, is provided and feed of the pressure oil as stated above is stopped to enable the operation of a bucket of the cylinder C3.
Bibliography:Application Number: JP19900207460