Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
CYLINDER DEVICE HAVING PRESSURE BOOSTING MECHANISM WITH PRESSURE RELIEF MECHANISM
Document Type and Number:
Japanese Patent JP2004183880
Kind Code:
A
Abstract:

To feed high-pressure oil of 70 mega Pascal to a load, by assembling a cylinder device having a pressure boosting mechanism with a pressure relief mechanism in a low-pressure hydraulic pump.

When low-pressure oil is fed to a load through a passage 13 and a secondary side oil chamber 11, a piston 1 is pressed by the operation of a valve mechanism 5 by the pressure increase, a pressure boosting piston rod 15 is moved to close the passage 13. In this condition, a portion 15a whose sectional area orthogonal to the axis is changed of the pressure boosting piston rod 15 is brought into contact with a seal packing 28 and leads to a parallel portion. The oil pressure generated during this operation is absorbed (taken in) by the movement of a piston rod 30 for pressure relief of a pressure relief mechanism 29.


Inventors:
ISOBE MASABUMI
Application Number:
JP2002000382897
Publication Date:
July 02, 2004
Filing Date:
December 02, 2002
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
ISOBE MASABUMI
International Classes:
F15B3/00; (IPC1-7): F15B3/00