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Title:
PNEUMATICALLY DRIVEN HYDRAULIC PUMP FOR RPESS
Document Type and Number:
Japanese Patent JPS58214682
Kind Code:
A
Abstract:

PURPOSE: To improve the characteristics of stroke pressing force of a press by a method wherein a potential energy accumulated in an air tank is utilized as a working energy for the press and the volume of discharged fluid from a high pressure line is increased at a stage of low hydraulic pressure.

CONSTITUTION: Since a piston 4a in a hydraulic cylinder 8a is integrally connected with a piston 3a in tandem form, it descends simultaneously with a descent of the piston 3a. The liquid in the liquid tank 10 flows in the upper part of the piston 4a, from a suction line 9. In turn, since the liquid in the hydraulic cylinder 8a is forcedly discharged out from the lower side of the piston 4a and the liquid is discharged from a discharging port 12 through a high pressure line 11, after given a high pressure, the characteristics of stroke pressing force of the press is improved.


Inventors:
Kamiide, Takuo
Application Number:
JP1982000097544
Publication Date:
December 13, 1983
Filing Date:
June 09, 1982
Export Citation:
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Assignee:
SUMITOMO HEAVY IND LTD
International Classes:
F04B9/129; F04B9/133; F04B9/137; (IPC1-7): F04B9/12



 
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