Cylinder apparatus
US6257117A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 20, 2000 |
| Grant date | Jul 10, 2001 |
| Priority date | — |
| Expiry date | Mar 20, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/7052
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The inside of a cylinder is divided into front and rear cylinder chambers, a primary-side piston and a secondary-side piston, each formed by an annular disc part and an annular tube part are fitted into each cylinder chamber, with the annular tube parts of each loosely fitted together, and the secondary-side piston surrounding an operating piston rod so as to hold the operating piston and being fit into the operating piston. The first front cylinder chamber and the second rear cylinder chamber defined by the primary- and secondary-side pistons are connected by a communicating passageway with a relief valve inserted therein, this relief valve being switched to the open condition by either a prescribed pressure or a valve opening/closing bar that is provided upright on the primary-side piston.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.