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Patent Searching and Data


Title:
BOOSTER
Document Type and Number:
Japanese Patent JP3678507
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To use even for a tool requiring a large amount of operating oil for a pre-load, by selectively connecting, an auxiliary oil supply passage to the front stage return oil passage of a low pressure relief valve, the rear stage return oil passage thereof or a drain oil passage through a selector valve.
SOLUTION: A low pressure relief valve 19 is interposed in a return oil passage 8, and a selector valve 20 is interposed among the front stage return oil passage 8 of the low pressure relieve valve 19, the rear stage return oil passage 8 thereof, or an auxiliary oil supply passage 15. The selector valve 20 is changed over to a switching position (a), and the auxiliary oil supply passage 15 is connected to the front stage return oil passage 8 of the low pressure relief valve 19. Hereupon, the driving hydraulic pressure of a driving cylinder A, controlled by the low pressure relief valve 19, is led to flow into the compression chamber 13 of a pressure intensifying cylinder B through the auxiliary oil supply passage 15 and a check valve 14, and a tool 18 is pressurized by this inflow hydraulic pressure. Therefore, this booster can be used even for the tool 18 requiring a large amount of operating oil for pre-load.


Inventors:
川上 謹司
櫨林 幹夫
Application Number:
JP1996000227566
Publication Date:
August 03, 2005
Filing Date:
August 09, 1996
Export Citation:
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Assignee:
株式会社タダノ
International Classes:
F15B3/00; F15B11/028; (IPC1-7): F15B11/028; F15B3/00
Domestic Patent References:
JP6036322Y2
JP3052404U
JP6249206A
JP5025081U