Pressure intensifying apparatus for hydraulic cylinder
US6581379B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2001 |
| Grant date | Jun 24, 2003 |
| Priority date | — |
| Expiry date | Nov 6, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/76
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
There are provided a pressure intensifying cylinder 2a for allowing a pressure intensifying chamber 31 to communicate with a head-side cylinder chamber 22 of a working cylinder 1 and its control hydraulic circuit. When a load and a rated pressure Pp of a hydraulic pump 25 are balanced with each other at the time of inserting and setting a core 41, a check valve 21 is closed and a sequence valve 34 is opened to move the pressure intensifying cylinder 2a forward, so that the pressure of the head-side cylinder chamber 22 is increased. A pressure intensifying ratio of the pressure intensifying cylinder 2a is set such that the pressure of the head-side cylinder chamber 22 is higher than pressure occurring with molding pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.